vehicle_gui.cpp

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/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <https://www.gnu.org/licenses/old-licenses/gpl-2.0>.
 */

 
#include "stdafx.h"
#include "debug.h"
#include "company_func.h"
#include "gui.h"
#include "textbuf_gui.h"
#include "command_func.h"
#include "vehicle_gui_base.h"
#include "viewport_func.h"
#include "newgrf_text.h"
#include "newgrf_debug.h"
#include "roadveh.h"
#include "train.h"
#include "aircraft.h"
#include "depot_map.h"
#include "group_gui.h"
#include "strings_func.h"
#include "vehicle_func.h"
#include "autoreplace_gui.h"
#include "string_func.h"
#include "dropdown_type.h"
#include "dropdown_func.h"
#include "timetable.h"
#include "articulated_vehicles.h"
#include "core/geometry_func.hpp"
#include "core/container_func.hpp"
#include "company_base.h"
#include "engine_func.h"
#include "station_base.h"
#include "tilehighlight_func.h"
#include "zoom_func.h"
#include "depot_cmd.h"
#include "vehicle_cmd.h"
#include "order_cmd.h"
#include "roadveh_cmd.h"
#include "train_cmd.h"
#include "hotkeys.h"
#include "group_cmd.h"
 
#include "table/strings.h"
 
#include "safeguards.h"
 
 
static std::array<std::array<BaseVehicleListWindow::GroupBy, VEH_COMPANY_END>, VLT_END> _grouping{};
static std::array<Sorting, BaseVehicleListWindow::GB_END> _sorting{};
 
static BaseVehicleListWindow::VehicleIndividualSortFunction VehicleNumberSorter;
static BaseVehicleListWindow::VehicleIndividualSortFunction VehicleNameSorter;
static BaseVehicleListWindow::VehicleIndividualSortFunction VehicleAgeSorter;
static BaseVehicleListWindow::VehicleIndividualSortFunction VehicleProfitThisYearSorter;
static BaseVehicleListWindow::VehicleIndividualSortFunction VehicleProfitLastYearSorter;
static BaseVehicleListWindow::VehicleIndividualSortFunction VehicleCargoSorter;
static BaseVehicleListWindow::VehicleIndividualSortFunction VehicleReliabilitySorter;
static BaseVehicleListWindow::VehicleIndividualSortFunction VehicleMaxSpeedSorter;
static BaseVehicleListWindow::VehicleIndividualSortFunction VehicleModelSorter;
static BaseVehicleListWindow::VehicleIndividualSortFunction VehicleValueSorter;
static BaseVehicleListWindow::VehicleIndividualSortFunction VehicleLengthSorter;
static BaseVehicleListWindow::VehicleIndividualSortFunction VehicleTimeToLiveSorter;
static BaseVehicleListWindow::VehicleIndividualSortFunction VehicleTimetableDelaySorter;
static BaseVehicleListWindow::VehicleGroupSortFunction VehicleGroupLengthSorter;
static BaseVehicleListWindow::VehicleGroupSortFunction VehicleGroupTotalProfitThisYearSorter;
static BaseVehicleListWindow::VehicleGroupSortFunction VehicleGroupTotalProfitLastYearSorter;
static BaseVehicleListWindow::VehicleGroupSortFunction VehicleGroupAverageProfitThisYearSorter;
static BaseVehicleListWindow::VehicleGroupSortFunction VehicleGroupAverageProfitLastYearSorter;

template <BaseVehicleListWindow::VehicleIndividualSortFunction func>
static bool VehicleIndividualToGroupSorterWrapper(GUIVehicleGroup const &a, GUIVehicleGroup const &b)
{
  return func(*(a.vehicles_begin), *(b.vehicles_begin));
}
 
const std::initializer_list<BaseVehicleListWindow::VehicleGroupSortFunction * const> BaseVehicleListWindow::vehicle_group_none_sorter_funcs = {
  &VehicleIndividualToGroupSorterWrapper<VehicleNumberSorter>,
  &VehicleIndividualToGroupSorterWrapper<VehicleNameSorter>,
  &VehicleIndividualToGroupSorterWrapper<VehicleAgeSorter>,
  &VehicleIndividualToGroupSorterWrapper<VehicleProfitThisYearSorter>,
  &VehicleIndividualToGroupSorterWrapper<VehicleProfitLastYearSorter>,
  &VehicleIndividualToGroupSorterWrapper<VehicleCargoSorter>,
  &VehicleIndividualToGroupSorterWrapper<VehicleReliabilitySorter>,
  &VehicleIndividualToGroupSorterWrapper<VehicleMaxSpeedSorter>,
  &VehicleIndividualToGroupSorterWrapper<VehicleModelSorter>,
  &VehicleIndividualToGroupSorterWrapper<VehicleValueSorter>,
  &VehicleIndividualToGroupSorterWrapper<VehicleLengthSorter>,
  &VehicleIndividualToGroupSorterWrapper<VehicleTimeToLiveSorter>,
  &VehicleIndividualToGroupSorterWrapper<VehicleTimetableDelaySorter>,
};
 
const std::initializer_list<const StringID> BaseVehicleListWindow::vehicle_group_none_sorter_names_calendar = {
  STR_SORT_BY_NUMBER,
  STR_SORT_BY_NAME,
  STR_SORT_BY_AGE,
  STR_SORT_BY_PROFIT_THIS_YEAR,
  STR_SORT_BY_PROFIT_LAST_YEAR,
  STR_SORT_BY_TOTAL_CAPACITY_PER_CARGOTYPE,
  STR_SORT_BY_RELIABILITY,
  STR_SORT_BY_MAX_SPEED,
  STR_SORT_BY_MODEL,
  STR_SORT_BY_VALUE,
  STR_SORT_BY_LENGTH,
  STR_SORT_BY_LIFE_TIME,
  STR_SORT_BY_TIMETABLE_DELAY,
};
 
const std::initializer_list<const StringID> BaseVehicleListWindow::vehicle_group_none_sorter_names_wallclock = {
  STR_SORT_BY_NUMBER,
  STR_SORT_BY_NAME,
  STR_SORT_BY_AGE,
  STR_SORT_BY_PROFIT_THIS_PERIOD,
  STR_SORT_BY_PROFIT_LAST_PERIOD,
  STR_SORT_BY_TOTAL_CAPACITY_PER_CARGOTYPE,
  STR_SORT_BY_RELIABILITY,
  STR_SORT_BY_MAX_SPEED,
  STR_SORT_BY_MODEL,
  STR_SORT_BY_VALUE,
  STR_SORT_BY_LENGTH,
  STR_SORT_BY_LIFE_TIME,
  STR_SORT_BY_TIMETABLE_DELAY,
};
 
const std::initializer_list<BaseVehicleListWindow::VehicleGroupSortFunction * const> BaseVehicleListWindow::vehicle_group_shared_orders_sorter_funcs = {
  &VehicleGroupLengthSorter,
  &VehicleGroupTotalProfitThisYearSorter,
  &VehicleGroupTotalProfitLastYearSorter,
  &VehicleGroupAverageProfitThisYearSorter,
  &VehicleGroupAverageProfitLastYearSorter,
};
 
const std::initializer_list<const StringID> BaseVehicleListWindow::vehicle_group_shared_orders_sorter_names_calendar = {
  STR_SORT_BY_NUM_VEHICLES,
  STR_SORT_BY_TOTAL_PROFIT_THIS_YEAR,
  STR_SORT_BY_TOTAL_PROFIT_LAST_YEAR,
  STR_SORT_BY_AVERAGE_PROFIT_THIS_YEAR,
  STR_SORT_BY_AVERAGE_PROFIT_LAST_YEAR,
};
 
const std::initializer_list<const StringID> BaseVehicleListWindow::vehicle_group_shared_orders_sorter_names_wallclock = {
  STR_SORT_BY_NUM_VEHICLES,
  STR_SORT_BY_TOTAL_PROFIT_THIS_PERIOD,
  STR_SORT_BY_TOTAL_PROFIT_LAST_PERIOD,
  STR_SORT_BY_AVERAGE_PROFIT_THIS_PERIOD,
  STR_SORT_BY_AVERAGE_PROFIT_LAST_PERIOD,
};
 
const std::initializer_list<const StringID> BaseVehicleListWindow::vehicle_group_by_names = {
  STR_GROUP_BY_NONE,
  STR_GROUP_BY_SHARED_ORDERS,
};
 
const StringID BaseVehicleListWindow::vehicle_depot_name[] = {
  STR_VEHICLE_LIST_SEND_TRAIN_TO_DEPOT,
  STR_VEHICLE_LIST_SEND_ROAD_VEHICLE_TO_DEPOT,
  STR_VEHICLE_LIST_SEND_SHIP_TO_DEPOT,
  STR_VEHICLE_LIST_SEND_AIRCRAFT_TO_HANGAR
};
 
BaseVehicleListWindow::BaseVehicleListWindow(WindowDesc &desc, const VehicleListIdentifier &vli) : Window(desc), vli(vli)
{
  this->vehicle_sel = VehicleID::Invalid();
  this->grouping = _grouping[vli.type][vli.vtype];
  this->UpdateSortingFromGrouping();
}
 
std::span<const StringID> BaseVehicleListWindow::GetVehicleSorterNames() const
{
  switch (this->grouping) {
    case GB_NONE:
      return TimerGameEconomy::UsingWallclockUnits() ? vehicle_group_none_sorter_names_wallclock : vehicle_group_none_sorter_names_calendar;
    case GB_SHARED_ORDERS:
      return TimerGameEconomy::UsingWallclockUnits() ? vehicle_group_shared_orders_sorter_names_wallclock : vehicle_group_shared_orders_sorter_names_calendar;
    default:
      NOT_REACHED();
  }
}

uint CountDigitsForAllocatingSpace(uint number)
{
  if (number >= 10000) return 5;
  if (number >= 1000) return 4;
  if (number >= 100) return 3;
 
  /*
   * When the smallest unit number is less than 10, it is
   * quite likely that it will expand to become more than
   * 10 quite soon.
   */
  return 2;
}

uint GetUnitNumberDigits(VehicleList &vehicles)
{
  uint unitnumber = 0;
  for (const Vehicle *v : vehicles) {
    unitnumber = std::max<uint>(unitnumber, v->unitnumber);
  }
 
  return CountDigitsForAllocatingSpace(unitnumber);
}
 
void BaseVehicleListWindow::BuildVehicleList()
{
  if (!this->vehgroups.NeedRebuild()) return;
 
  Debug(misc, 3, "Building vehicle list type {} for company {} given index {}", this->vli.type, this->vli.company, this->vli.index);
 
  this->vehgroups.clear();
 
  GenerateVehicleSortList(&this->vehicles, this->vli);
 
  CargoTypes used = 0;
  for (const Vehicle *v : this->vehicles) {
    for (const Vehicle *u = v; u != nullptr; u = u->Next()) {
      if (u->cargo_cap > 0) SetBit(used, u->cargo_type);
    }
  }
  this->used_cargoes = used;
 
  if (this->grouping == GB_NONE) {
    uint max_unitnumber = 0;
    for (auto it = this->vehicles.begin(); it != this->vehicles.end(); ++it) {
      this->vehgroups.emplace_back(it, it + 1);
 
      max_unitnumber = std::max<uint>(max_unitnumber, (*it)->unitnumber);
    }
    this->unitnumber_digits = CountDigitsForAllocatingSpace(max_unitnumber);
  } else {
    /* Sort by the primary vehicle; we just want all vehicles that share the same orders to form a contiguous range. */
    std::stable_sort(this->vehicles.begin(), this->vehicles.end(), [](const Vehicle * const &u, const Vehicle * const &v) {
      return u->FirstShared() < v->FirstShared();
    });
 
    uint max_num_vehicles = 0;
 
    VehicleList::const_iterator begin = this->vehicles.begin();
    while (begin != this->vehicles.end()) {
      VehicleList::const_iterator end = std::find_if_not(begin, this->vehicles.cend(), [first_shared = (*begin)->FirstShared()](const Vehicle * const &v) {
        return v->FirstShared() == first_shared;
      });
 
      this->vehgroups.emplace_back(begin, end);
 
      max_num_vehicles = std::max<uint>(max_num_vehicles, static_cast<uint>(end - begin));
 
      begin = end;
    }
 
    this->unitnumber_digits = CountDigitsForAllocatingSpace(max_num_vehicles);
  }
  this->FilterVehicleList();
 
  this->vehgroups.RebuildDone();
  this->vscroll->SetCount(this->vehgroups.size());
}

static bool CargoFilterSingle(const Vehicle *v, const CargoType cargo_type)
{
  if (cargo_type == CargoFilterCriteria::CF_ANY) {
    return true;
  } else if (cargo_type == CargoFilterCriteria::CF_NONE) {
    for (const Vehicle *w = v; w != nullptr; w = w->Next()) {
      if (w->cargo_cap > 0) {
        return false;
      }
    }
    return true;
  } else if (cargo_type == CargoFilterCriteria::CF_FREIGHT) {
    bool have_capacity = false;
    for (const Vehicle *w = v; w != nullptr; w = w->Next()) {
      if (w->cargo_cap > 0) {
        if (IsCargoInClass(w->cargo_type, CargoClass::Passengers)) {
          return false;
        } else {
          have_capacity = true;
        }
      }
    }
    return have_capacity;
  } else {
    for (const Vehicle *w = v; w != nullptr; w = w->Next()) {
      if (w->cargo_cap > 0 && w->cargo_type == cargo_type) {
        return true;
      }
    }
    return false;
  }
}

static bool CargoFilter(const GUIVehicleGroup *vehgroup, const CargoType cargo_type)
{
  auto it = vehgroup->vehicles_begin;
 
  /* Check if any vehicle in the group matches; if so, the whole group does. */
  for (; it != vehgroup->vehicles_end; it++) {
    if (CargoFilterSingle(*it, cargo_type)) return true;
  }
 
  return false;
}

bool ShowCargoIconOverlay()
{
  return _shift_pressed && _ctrl_pressed;
}

void AddCargoIconOverlay(std::vector<CargoIconOverlay> &overlays, int x, int width, const Vehicle *v)
{
  bool rtl = _current_text_dir == TD_RTL;
  if (!v->IsArticulatedPart() || v->cargo_type != v->Previous()->cargo_type) {
    /* Add new overlay slot. */
    overlays.emplace_back(rtl ? x - width : x, rtl ? x : x + width, v->cargo_type, v->cargo_cap);
  } else {
    /* This is an articulated part with the same cargo type, adjust left or right of last overlay slot. */
    if (rtl) {
      overlays.back().left -= width;
    } else {
      overlays.back().right += width;
    }
    overlays.back().cargo_cap += v->cargo_cap;
  }
}

void DrawCargoIconOverlay(int x, int y, CargoType cargo_type)
{
  if (!ShowCargoIconOverlay()) return;
  if (!IsValidCargoType(cargo_type)) return;
 
  const CargoSpec *cs = CargoSpec::Get(cargo_type);
 
  SpriteID spr = cs->GetCargoIcon();
  if (spr == 0) return;
 
  Dimension d = GetSpriteSize(spr);
  d.width /= 2;
  d.height /= 2;
  int one = ScaleGUITrad(1);
 
  /* Draw the cargo icon in black shifted 4 times to create the outline. */
  DrawSprite(spr, PALETTE_ALL_BLACK, x - d.width - one, y - d.height);
  DrawSprite(spr, PALETTE_ALL_BLACK, x - d.width + one, y - d.height);
  DrawSprite(spr, PALETTE_ALL_BLACK, x - d.width, y - d.height - one);
  DrawSprite(spr, PALETTE_ALL_BLACK, x - d.width, y - d.height + one);
  /* Draw the cargo icon normally. */
  DrawSprite(spr, PAL_NONE, x - d.width, y - d.height);
}

void DrawCargoIconOverlays(std::span<const CargoIconOverlay> overlays, int y)
{
  for (const auto &cio : overlays) {
    if (cio.cargo_cap == 0) continue;
    DrawCargoIconOverlay((cio.left + cio.right) / 2, y, cio.cargo_type);
  }
}
 
static GUIVehicleGroupList::FilterFunction * const _vehicle_group_filter_funcs[] = {
  &CargoFilter,
};

void BaseVehicleListWindow::SetCargoFilter(CargoType cargo_type)
{
  if (this->cargo_filter_criteria != cargo_type) {
    this->cargo_filter_criteria = cargo_type;
    /* Deactivate filter if criteria is 'Show All', activate it otherwise. */
    this->vehgroups.SetFilterState(this->cargo_filter_criteria != CargoFilterCriteria::CF_ANY);
    this->vehgroups.SetFilterType(0);
    this->vehgroups.ForceRebuild();
  }
}

void BaseVehicleListWindow::SetCargoFilterArray()
{
  this->cargo_filter_criteria = CargoFilterCriteria::CF_ANY;
  this->vehgroups.SetFilterFuncs(_vehicle_group_filter_funcs);
  this->vehgroups.SetFilterState(this->cargo_filter_criteria != CargoFilterCriteria::CF_ANY);
}

void BaseVehicleListWindow::FilterVehicleList()
{
  this->vehgroups.Filter(this->cargo_filter_criteria);
  if (this->vehicles.empty()) {
    /* No vehicle passed through the filter, invalidate the previously selected vehicle */
    this->vehicle_sel = VehicleID::Invalid();
  } else if (this->vehicle_sel != VehicleID::Invalid() && std::ranges::find(this->vehicles, Vehicle::Get(this->vehicle_sel)) == this->vehicles.end()) { // previously selected engine didn't pass the filter, remove selection
    this->vehicle_sel = VehicleID::Invalid();
  }
}

Dimension BaseVehicleListWindow::GetActionDropdownSize(bool show_autoreplace, bool show_group, bool show_create)
{
  Dimension d = {0, 0};
 
  if (show_autoreplace) d = maxdim(d, GetStringBoundingBox(STR_VEHICLE_LIST_REPLACE_VEHICLES));
  d = maxdim(d, GetStringBoundingBox(STR_VEHICLE_LIST_SEND_FOR_SERVICING));
  d = maxdim(d, GetStringBoundingBox(this->vehicle_depot_name[this->vli.vtype]));
 
  if (show_group) {
    d = maxdim(d, GetStringBoundingBox(STR_GROUP_ADD_SHARED_VEHICLE));
    d = maxdim(d, GetStringBoundingBox(STR_GROUP_REMOVE_ALL_VEHICLES));
  } else if (show_create) {
    d = maxdim(d, GetStringBoundingBox(STR_VEHICLE_LIST_CREATE_GROUP));
  }
 
  return d;
}
 
void BaseVehicleListWindow::OnInit()
{
  this->order_arrow_width = std::max(GetStringBoundingBox(STR_JUST_LEFT_ARROW, FS_SMALL).width, GetStringBoundingBox(STR_JUST_RIGHT_ARROW, FS_SMALL).width);
  this->SetCargoFilterArray();
}
 
StringID BaseVehicleListWindow::GetCargoFilterLabel(CargoType cargo_type) const
{
  switch (cargo_type) {
    case CargoFilterCriteria::CF_ANY: return STR_CARGO_TYPE_FILTER_ALL;
    case CargoFilterCriteria::CF_FREIGHT: return STR_CARGO_TYPE_FILTER_FREIGHT;
    case CargoFilterCriteria::CF_NONE: return STR_CARGO_TYPE_FILTER_NONE;
    default: return CargoSpec::Get(cargo_type)->name;
  }
}

DropDownList BaseVehicleListWindow::BuildCargoDropDownList(bool full) const
{
  DropDownList list;
 
  /* Add item for disabling filtering. */
  list.push_back(MakeDropDownListStringItem(this->GetCargoFilterLabel(CargoFilterCriteria::CF_ANY), CargoFilterCriteria::CF_ANY));
  /* Add item for freight (i.e. vehicles with cargo capacity and with no passenger capacity). */
  list.push_back(MakeDropDownListStringItem(this->GetCargoFilterLabel(CargoFilterCriteria::CF_FREIGHT), CargoFilterCriteria::CF_FREIGHT));
  /* Add item for vehicles not carrying anything, e.g. train engines. */
  list.push_back(MakeDropDownListStringItem(this->GetCargoFilterLabel(CargoFilterCriteria::CF_NONE), CargoFilterCriteria::CF_NONE));
 
  /* Add cargos */
  Dimension d = GetLargestCargoIconSize();
  for (const CargoSpec *cs : _sorted_cargo_specs) {
    if (!full && !HasBit(this->used_cargoes, cs->Index())) continue;
    list.push_back(MakeDropDownListIconItem(d, cs->GetCargoIcon(), PAL_NONE, cs->name, cs->Index(), false, !HasBit(this->used_cargoes, cs->Index())));
  }
 
  return list;
}

DropDownList BaseVehicleListWindow::BuildActionDropdownList(bool show_autoreplace, bool show_group, bool show_create)
{
  DropDownList list;
 
  /* Autoreplace actions. */
  if (show_autoreplace) {
    list.push_back(MakeDropDownListStringItem(STR_VEHICLE_LIST_REPLACE_VEHICLES, ADI_REPLACE));
    list.push_back(MakeDropDownListDividerItem());
  }
 
  /* Group actions. */
  if (show_group) {
    list.push_back(MakeDropDownListStringItem(STR_GROUP_ADD_SHARED_VEHICLE, ADI_ADD_SHARED));
    list.push_back(MakeDropDownListStringItem(STR_GROUP_REMOVE_ALL_VEHICLES, ADI_REMOVE_ALL));
    list.push_back(MakeDropDownListDividerItem());
  } else if (show_create) {
    list.push_back(MakeDropDownListStringItem(STR_VEHICLE_LIST_CREATE_GROUP, ADI_CREATE_GROUP));
    list.push_back(MakeDropDownListDividerItem());
  }
 
  /* Depot actions. */
  list.push_back(MakeDropDownListStringItem(STR_VEHICLE_LIST_SEND_FOR_SERVICING, ADI_SERVICE));
  list.push_back(MakeDropDownListStringItem(this->vehicle_depot_name[this->vli.vtype], ADI_DEPOT));
 
  return list;
}
 
/* cached values for VehicleNameSorter to spare many GetString() calls */
static const Vehicle *_last_vehicle[2] = { nullptr, nullptr };
 
void BaseVehicleListWindow::SortVehicleList()
{
  if (this->vehgroups.Sort()) return;
 
  /* invalidate cached values for name sorter - vehicle names could change */
  _last_vehicle[0] = _last_vehicle[1] = nullptr;
}
 
void DepotSortList(VehicleList *list)
{
  if (list->size() < 2) return;
  std::sort(list->begin(), list->end(), &VehicleNumberSorter);
}

static void DrawVehicleProfitButton(TimerGameEconomy::Date age, Money display_profit_last_year, uint num_vehicles, int x, int y)
{
  SpriteID spr;
 
  /* draw profit-based coloured icons */
  if (age <= VEHICLE_PROFIT_MIN_AGE) {
    spr = SPR_PROFIT_NA;
  } else if (display_profit_last_year < 0) {
    spr = SPR_PROFIT_NEGATIVE;
  } else if (display_profit_last_year < VEHICLE_PROFIT_THRESHOLD * num_vehicles) {
    spr = SPR_PROFIT_SOME;
  } else {
    spr = SPR_PROFIT_LOT;
  }
  DrawSprite(spr, PAL_NONE, x, y);
}

static const uint MAX_REFIT_CYCLE = 256;

uint8_t GetBestFittingSubType(Vehicle *v_from, Vehicle *v_for, CargoType dest_cargo_type)
{
  v_from = v_from->GetFirstEnginePart();
  v_for = v_for->GetFirstEnginePart();
 
  /* Create a list of subtypes used by the various parts of v_for */
  static std::vector<StringID> subtypes;
  subtypes.clear();
  for (; v_from != nullptr; v_from = v_from->HasArticulatedPart() ? v_from->GetNextArticulatedPart() : nullptr) {
    const Engine *e_from = v_from->GetEngine();
    if (!e_from->CanCarryCargo() || !e_from->info.callback_mask.Test(VehicleCallbackMask::CargoSuffix)) continue;
    include(subtypes, GetCargoSubtypeText(v_from));
  }
 
  uint8_t ret_refit_cyc = 0;
  bool success = false;
  if (!subtypes.empty()) {
    /* Check whether any articulated part is refittable to 'dest_cargo_type' with a subtype listed in 'subtypes' */
    for (Vehicle *v = v_for; v != nullptr; v = v->HasArticulatedPart() ? v->GetNextArticulatedPart() : nullptr) {
      const Engine *e = v->GetEngine();
      if (!e->CanCarryCargo() || !e->info.callback_mask.Test(VehicleCallbackMask::CargoSuffix)) continue;
      if (!HasBit(e->info.refit_mask, dest_cargo_type) && v->cargo_type != dest_cargo_type) continue;
 
      CargoType old_cargo_type = v->cargo_type;
      uint8_t old_cargo_subtype = v->cargo_subtype;
 
      /* Set the 'destination' cargo */
      v->cargo_type = dest_cargo_type;
 
      /* Cycle through the refits */
      for (uint refit_cyc = 0; refit_cyc < MAX_REFIT_CYCLE; refit_cyc++) {
        v->cargo_subtype = refit_cyc;
 
        /* Make sure we don't pick up anything cached. */
        v->First()->InvalidateNewGRFCache();
        v->InvalidateNewGRFCache();
 
        StringID subtype = GetCargoSubtypeText(v);
        if (subtype == STR_EMPTY) break;
 
        if (std::ranges::find(subtypes, subtype) == subtypes.end()) continue;
 
        /* We found something matching. */
        ret_refit_cyc = refit_cyc;
        success = true;
        break;
      }
 
      /* Reset the vehicle's cargo type */
      v->cargo_type    = old_cargo_type;
      v->cargo_subtype = old_cargo_subtype;
 
      /* Make sure we don't taint the vehicle. */
      v->First()->InvalidateNewGRFCache();
      v->InvalidateNewGRFCache();
 
      if (success) break;
    }
  }
 
  return ret_refit_cyc;
}

struct RefitOption {
  CargoType cargo;    
  uint8_t subtype;     
  StringID string;  

  inline bool operator == (const RefitOption &other) const
  {
    return other.cargo == this->cargo && other.string == this->string;
  }
};
 
using RefitOptions = std::map<CargoType, std::vector<RefitOption>, CargoTypeComparator>; 

static void DrawVehicleRefitWindow(const RefitOptions &refits, const RefitOption *sel, uint pos, uint rows, uint delta, const Rect &r)
{
  Rect ir = r.Shrink(WidgetDimensions::scaled.matrix);
  uint current = 0;
 
  bool rtl = _current_text_dir == TD_RTL;
  uint iconwidth = std::max(GetSpriteSize(SPR_CIRCLE_FOLDED).width, GetSpriteSize(SPR_CIRCLE_UNFOLDED).width);
  uint iconheight = GetSpriteSize(SPR_CIRCLE_FOLDED).height;
  PixelColour linecolour = GetColourGradient(COLOUR_ORANGE, SHADE_NORMAL);
 
  int iconleft   = rtl ? ir.right - iconwidth     : ir.left;
  int iconcenter = rtl ? ir.right - iconwidth / 2 : ir.left + iconwidth / 2;
  int iconinner  = rtl ? ir.right - iconwidth     : ir.left + iconwidth;
 
  Rect tr = ir.Indent(iconwidth + WidgetDimensions::scaled.hsep_wide, rtl);
 
  /* Draw the list of subtypes for each cargo, and find the selected refit option (by its position). */
  for (const auto &pair : refits) {
    bool has_subtypes = pair.second.size() > 1;
    for (const RefitOption &refit : pair.second) {
      if (current >= pos + rows) break;
 
      /* Hide subtypes if selected cargo type does not match */
      if ((sel == nullptr || sel->cargo != refit.cargo) && refit.subtype != UINT8_MAX) continue;
 
      /* Refit options with a position smaller than pos don't have to be drawn. */
      if (current < pos) {
        current++;
        continue;
      }
 
      if (has_subtypes) {
        if (refit.subtype != UINT8_MAX) {
          /* Draw tree lines */
          int ycenter = tr.top + GetCharacterHeight(FS_NORMAL) / 2;
          GfxDrawLine(iconcenter, tr.top - WidgetDimensions::scaled.matrix.top, iconcenter, (&refit == &pair.second.back()) ? ycenter : tr.top - WidgetDimensions::scaled.matrix.top + delta - 1, linecolour);
          GfxDrawLine(iconcenter, ycenter, iconinner, ycenter, linecolour);
        } else {
          /* Draw expand/collapse icon */
          DrawSprite((sel != nullptr && sel->cargo == refit.cargo) ? SPR_CIRCLE_UNFOLDED : SPR_CIRCLE_FOLDED, PAL_NONE, iconleft, tr.top + (GetCharacterHeight(FS_NORMAL) - iconheight) / 2);
        }
      }
 
      TextColour colour = (sel != nullptr && sel->cargo == refit.cargo && sel->subtype == refit.subtype) ? TC_WHITE : TC_BLACK;
      /* Get the cargo name. */
      DrawString(tr, GetString(STR_JUST_STRING_STRING, CargoSpec::Get(refit.cargo)->name, refit.string), colour);
 
      tr.top += delta;
      current++;
    }
  }
}

struct RefitWindow : public Window {
  const RefitOption *selected_refit = nullptr; 
  RefitOptions refit_list{}; 
  VehicleOrderID order = INVALID_VEH_ORDER_ID; 
  uint information_width = 0; 
  Scrollbar *vscroll = nullptr; 
  Scrollbar *hscroll = nullptr; 
  int vehicle_width = 0; 
  int sprite_left = 0; 
  int sprite_right = 0; 
  uint vehicle_margin = 0; 
  int click_x = 0; 
  VehicleID selected_vehicle{}; 
  uint8_t num_vehicles = 0; 
  bool auto_refit = false; 

  void BuildRefitList()
  {
    /* Store the currently selected RefitOption. */
    std::optional<RefitOption> current_refit_option;
    if (this->selected_refit != nullptr) current_refit_option = *(this->selected_refit);
    this->selected_refit = nullptr;
 
    this->refit_list.clear();
    Vehicle *v = Vehicle::Get(this->window_number);
 
    /* Check only the selected vehicles. */
    VehicleSet vehicles_to_refit;
    GetVehicleSet(vehicles_to_refit, Vehicle::Get(this->selected_vehicle), this->num_vehicles);
 
    do {
      if (v->type == VEH_TRAIN && std::ranges::find(vehicles_to_refit, v->index) == vehicles_to_refit.end()) continue;
      const Engine *e = v->GetEngine();
      CargoTypes cmask = e->info.refit_mask;
      VehicleCallbackMasks callback_mask = e->info.callback_mask;
 
      /* Skip this engine if it does not carry anything */
      if (!e->CanCarryCargo()) continue;
      /* Skip this engine if we build the list for auto-refitting and engine doesn't allow it. */
      if (this->auto_refit && !e->info.misc_flags.Test(EngineMiscFlag::AutoRefit)) continue;
 
      /* Loop through all cargoes in the refit mask */
      for (const auto &cs : _sorted_cargo_specs) {
        CargoType cargo_type = cs->Index();
        /* Skip cargo type if it's not listed */
        if (!HasBit(cmask, cargo_type)) continue;
 
        auto &list = this->refit_list[cargo_type];
        bool first_vehicle = list.empty();
        if (first_vehicle) {
          /* Keeping the current subtype is always an option. It also serves as the option in case of no subtypes */
          list.emplace_back(cargo_type, UINT8_MAX, STR_EMPTY);
        }
 
        /* Check the vehicle's callback mask for cargo suffixes.
         * This is not supported for ordered refits, since subtypes only have a meaning
         * for a specific vehicle at a specific point in time, which conflicts with shared orders,
         * autoreplace, autorenew, clone, order restoration, ... */
        if (this->order == INVALID_VEH_ORDER_ID && callback_mask.Test(VehicleCallbackMask::CargoSuffix)) {
          /* Make a note of the original cargo type. It has to be
           * changed to test the cargo & subtype... */
          CargoType temp_cargo = v->cargo_type;
          uint8_t temp_subtype  = v->cargo_subtype;
 
          v->cargo_type = cargo_type;
 
          for (uint refit_cyc = 0; refit_cyc < MAX_REFIT_CYCLE; refit_cyc++) {
            v->cargo_subtype = refit_cyc;
 
            /* Make sure we don't pick up anything cached. */
            v->First()->InvalidateNewGRFCache();
            v->InvalidateNewGRFCache();
 
            StringID subtype = GetCargoSubtypeText(v);
 
            if (first_vehicle) {
              /* Append new subtype (don't add duplicates though) */
              if (subtype == STR_EMPTY) break;
 
              RefitOption option{cargo_type, static_cast<uint8_t>(refit_cyc), subtype};
              include(list, option);
            } else {
              /* Intersect the subtypes of earlier vehicles with the subtypes of this vehicle */
              if (subtype == STR_EMPTY) {
                /* No more subtypes for this vehicle, delete all subtypes >= refit_cyc */
                /* UINT8_MAX item is in front, other subtypes are sorted. So just truncate the list in the right spot */
                for (uint i = 1; i < list.size(); i++) {
                  if (list[i].subtype >= refit_cyc) {
                    list.erase(list.begin() + i, list.end());
                    break;
                  }
                }
                break;
              } else {
                /* Check whether the subtype matches with the subtype of earlier vehicles. */
                uint pos = 1;
                while (pos < list.size() && list[pos].subtype != refit_cyc) pos++;
                if (pos < list.size() && list[pos].string != subtype) {
                  /* String mismatch, remove item keeping the order */
                  list.erase(list.begin() + pos);
                }
              }
            }
          }
 
          /* Reset the vehicle's cargo type */
          v->cargo_type    = temp_cargo;
          v->cargo_subtype = temp_subtype;
 
          /* And make sure we haven't tainted the cache */
          v->First()->InvalidateNewGRFCache();
          v->InvalidateNewGRFCache();
        }
      }
    } while (v->IsGroundVehicle() && (v = v->Next()) != nullptr);
 
    /* Restore the previously selected RefitOption. */
    if (current_refit_option.has_value()) {
      for (const auto &pair : this->refit_list) {
        for (const auto &refit : pair.second) {
          if (refit.cargo == current_refit_option->cargo && refit.subtype == current_refit_option->subtype) {
            this->selected_refit = &refit;
            break;
          }
        }
        if (this->selected_refit != nullptr) break;
      }
    }
 
    this->SetWidgetDisabledState(WID_VR_REFIT, this->selected_refit == nullptr);
  }

  void RefreshScrollbar()
  {
    size_t scroll_row = 0;
    size_t rows = 0;
    CargoType cargo = this->selected_refit == nullptr ? INVALID_CARGO : this->selected_refit->cargo;
 
    for (const auto &pair : this->refit_list) {
      if (pair.first == cargo) {
        /* selected_refit points to an element in the vector so no need to search for it. */
        scroll_row = rows + (this->selected_refit - pair.second.data());
        rows += pair.second.size();
      } else {
        rows++; /* Unselected cargo type is collapsed into one row. */
      }
    }
 
    this->vscroll->SetCount(rows);
    this->vscroll->ScrollTowards(static_cast<int>(scroll_row));
  }

  void SetSelection(uint click_row)
  {
    uint row = 0;
 
    for (const auto &pair : refit_list) {
      for (const RefitOption &refit : pair.second) {
        if (row == click_row) {
          this->selected_refit = &refit;
          return;
        }
        row++;
        /* If this cargo type is not already selected then its subtypes are not visible, so skip the rest. */
        if (this->selected_refit == nullptr || this->selected_refit->cargo != refit.cargo) break;
      }
    }
 
    /* No selection made */
    this->selected_refit = nullptr;
  }
 
  RefitWindow(WindowDesc &desc, const Vehicle *v, VehicleOrderID order, bool auto_refit) : Window(desc)
  {
    this->auto_refit = auto_refit;
    this->order = order;
    this->CreateNestedTree();
 
    this->vscroll = this->GetScrollbar(WID_VR_SCROLLBAR);
    this->hscroll = (v->IsGroundVehicle() ? this->GetScrollbar(WID_VR_HSCROLLBAR) : nullptr);
    this->GetWidget<NWidgetCore>(WID_VR_SELECT_HEADER)->SetToolTip(STR_REFIT_TRAIN_LIST_TOOLTIP + v->type);
    this->GetWidget<NWidgetCore>(WID_VR_MATRIX)->SetToolTip(STR_REFIT_TRAIN_LIST_TOOLTIP + v->type);
    NWidgetCore *nwi = this->GetWidget<NWidgetCore>(WID_VR_REFIT);
    nwi->SetStringTip(STR_REFIT_TRAIN_REFIT_BUTTON + v->type, STR_REFIT_TRAIN_REFIT_TOOLTIP + v->type);
    this->GetWidget<NWidgetStacked>(WID_VR_SHOW_HSCROLLBAR)->SetDisplayedPlane(v->IsGroundVehicle() ? 0 : SZSP_HORIZONTAL);
    this->GetWidget<NWidgetCore>(WID_VR_VEHICLE_PANEL_DISPLAY)->SetToolTip((v->type == VEH_TRAIN) ? STR_REFIT_SELECT_VEHICLES_TOOLTIP : STR_NULL);
 
    this->FinishInitNested(v->index);
    this->owner = v->owner;
 
    this->SetWidgetDisabledState(WID_VR_REFIT, this->selected_refit == nullptr);
  }
 
  void OnInit() override
  {
    /* (Re)build the refit list */
    this->OnInvalidateData(VIWD_CONSIST_CHANGED);
  }
 
  void OnPaint() override
  {
    /* Determine amount of items for scroller. */
    if (this->hscroll != nullptr) this->hscroll->SetCount(this->vehicle_width);
 
    /* Calculate sprite position. */
    NWidgetCore *vehicle_panel_display = this->GetWidget<NWidgetCore>(WID_VR_VEHICLE_PANEL_DISPLAY);
    int sprite_width = std::max(0, ((int)vehicle_panel_display->current_x - this->vehicle_width) / 2);
    this->sprite_left = vehicle_panel_display->pos_x;
    this->sprite_right = vehicle_panel_display->pos_x + vehicle_panel_display->current_x - 1;
    if (_current_text_dir == TD_RTL) {
      this->sprite_right -= sprite_width;
      this->vehicle_margin = vehicle_panel_display->current_x - sprite_right;
    } else {
      this->sprite_left += sprite_width;
      this->vehicle_margin = sprite_left;
    }
 
    this->DrawWidgets();
  }
 
  void UpdateWidgetSize(WidgetID widget, Dimension &size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension &fill, [[maybe_unused]] Dimension &resize) override
  {
    switch (widget) {
      case WID_VR_MATRIX:
        fill.height = resize.height = GetCharacterHeight(FS_NORMAL) + padding.height;
        size.height = resize.height * 8;
        break;
 
      case WID_VR_VEHICLE_PANEL_DISPLAY:
        size.height = ScaleGUITrad(GetVehicleHeight(Vehicle::Get(this->window_number)->type));
        break;
 
      case WID_VR_INFO:
        size.width = this->information_width + padding.height;
        break;
    }
  }
 
  std::string GetWidgetString(WidgetID widget, StringID stringid) const override
  {
    if (widget == WID_VR_CAPTION) return GetString(STR_REFIT_CAPTION, Vehicle::Get(this->window_number)->index);
 
    return this->Window::GetWidgetString(widget, stringid);
  }

  std::string GetCapacityString(const RefitOption &option) const
  {
    assert(_current_company == _local_company);
    auto [cost, refit_capacity, mail_capacity, cargo_capacities] = Command<Commands::RefitVehicle>::Do(DoCommandFlag::QueryCost, this->selected_vehicle, option.cargo, option.subtype, this->auto_refit, false, this->num_vehicles);
 
    if (cost.Failed()) return {};
 
    Money money = cost.GetCost();
    if (mail_capacity > 0) {
      if (this->order != INVALID_VEH_ORDER_ID) {
        /* No predictable cost */
        return GetString(STR_PURCHASE_INFO_AIRCRAFT_CAPACITY, option.cargo, refit_capacity, GetCargoTypeByLabel(CT_MAIL), mail_capacity);
      }
 
      if (money <= 0) {
        return GetString(STR_REFIT_NEW_CAPACITY_INCOME_FROM_AIRCRAFT_REFIT, option.cargo, refit_capacity, GetCargoTypeByLabel(CT_MAIL), mail_capacity, -money);
      }
 
      return GetString(STR_REFIT_NEW_CAPACITY_COST_OF_AIRCRAFT_REFIT, option.cargo, refit_capacity, GetCargoTypeByLabel(CT_MAIL), mail_capacity, money);
    }
 
    if (this->order != INVALID_VEH_ORDER_ID) {
      /* No predictable cost */
      return GetString(STR_PURCHASE_INFO_CAPACITY, option.cargo, refit_capacity, STR_EMPTY);
    }
 
    if (money <= 0) {
      return GetString(STR_REFIT_NEW_CAPACITY_INCOME_FROM_REFIT, option.cargo, refit_capacity, -money);
    }
 
    return GetString(STR_REFIT_NEW_CAPACITY_COST_OF_REFIT, option.cargo, refit_capacity, money);
  }
 
  void DrawWidget(const Rect &r, WidgetID widget) const override
  {
    switch (widget) {
      case WID_VR_VEHICLE_PANEL_DISPLAY: {
        Vehicle *v = Vehicle::Get(this->window_number);
        DrawVehicleImage(v, r.WithX(this->sprite_left, this->sprite_right),
          VehicleID::Invalid(), EIT_IN_DETAILS, this->hscroll != nullptr ? this->hscroll->GetPosition() : 0);
 
        /* Highlight selected vehicles. */
        if (this->order != INVALID_VEH_ORDER_ID) break;
        int x = 0;
        switch (v->type) {
          case VEH_TRAIN: {
            VehicleSet vehicles_to_refit;
            GetVehicleSet(vehicles_to_refit, Vehicle::Get(this->selected_vehicle), this->num_vehicles);
 
            int left = INT32_MIN;
            int width = 0;
 
            /* Determine top & bottom position of the highlight.*/
            const int height = ScaleSpriteTrad(12);
            const int highlight_top = CentreBounds(r.top, r.bottom, height);
            const int highlight_bottom = highlight_top + height - 1;
 
            for (Train *u = Train::From(v); u != nullptr; u = u->Next()) {
              /* Start checking. */
              const bool contained = std::ranges::find(vehicles_to_refit, u->index) != vehicles_to_refit.end();
              if (contained && left == INT32_MIN) {
                left = x - this->hscroll->GetPosition() + r.left + this->vehicle_margin;
                width = 0;
              }
 
              /* Draw a selection. */
              if ((!contained || u->Next() == nullptr) && left != INT32_MIN) {
                if (u->Next() == nullptr && contained) {
                  int current_width = u->GetDisplayImageWidth();
                  width += current_width;
                  x += current_width;
                }
 
                int right = Clamp(left + width, 0, r.right);
                left = std::max(0, left);
 
                if (_current_text_dir == TD_RTL) {
                  right = r.Width() - left;
                  left = right - width;
                }
 
                if (left != right) {
                  Rect hr = {left, highlight_top, right, highlight_bottom};
                  DrawFrameRect(hr.Expand(WidgetDimensions::scaled.bevel), COLOUR_WHITE, FrameFlag::BorderOnly);
                }
 
                left = INT32_MIN;
              }
 
              int current_width = u->GetDisplayImageWidth();
              width += current_width;
              x += current_width;
            }
            break;
          }
 
          default: break;
        }
        break;
      }
 
      case WID_VR_MATRIX:
        DrawVehicleRefitWindow(this->refit_list, this->selected_refit, this->vscroll->GetPosition(), this->vscroll->GetCapacity(), this->resize.step_height, r);
        break;
 
      case WID_VR_INFO:
        if (this->selected_refit != nullptr) {
          std::string string = this->GetCapacityString(*this->selected_refit);
          if (!string.empty()) {
            DrawStringMultiLine(r.Shrink(WidgetDimensions::scaled.framerect), string);
          }
        }
        break;
    }
  }

  void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
  {
    switch (data) {
      case VIWD_AUTOREPLACE: // Autoreplace replaced the vehicle; selected_vehicle became invalid.
      case VIWD_CONSIST_CHANGED: { // The consist has changed; rebuild the entire list.
        /* Clear the selection. */
        Vehicle *v = Vehicle::Get(this->window_number);
        this->selected_vehicle = v->index;
        this->num_vehicles = UINT8_MAX;
        [[fallthrough]];
      }
 
      case 2: { // The vehicle selection has changed; rebuild the entire list.
        if (!gui_scope) break;
        this->BuildRefitList();
 
        /* The vehicle width has changed too. */
        this->vehicle_width = GetVehicleWidth(Vehicle::Get(this->window_number), EIT_IN_DETAILS);
        uint max_width = 0;
 
        /* Check the width of all cargo information strings. */
        for (const auto &list : this->refit_list) {
          for (const RefitOption &refit : list.second) {
            std::string string = this->GetCapacityString(refit);
            if (!string.empty()) {
              Dimension dim = GetStringBoundingBox(string);
              max_width = std::max(dim.width, max_width);
            }
          }
        }
 
        if (this->information_width < max_width) {
          this->information_width = max_width;
          this->ReInit();
        }
        [[fallthrough]];
      }
 
      case 1: // A new cargo has been selected.
        if (!gui_scope) break;
        this->RefreshScrollbar();
        break;
    }
  }
 
  int GetClickPosition(int click_x)
  {
    const NWidgetCore *matrix_widget = this->GetWidget<NWidgetCore>(WID_VR_VEHICLE_PANEL_DISPLAY);
    if (_current_text_dir == TD_RTL) click_x = matrix_widget->current_x - click_x;
    click_x -= this->vehicle_margin;
    if (this->hscroll != nullptr) click_x += this->hscroll->GetPosition();
 
    return click_x;
  }
 
  void SetSelectedVehicles(int drag_x)
  {
    drag_x = GetClickPosition(drag_x);
 
    int left_x  = std::min(this->click_x, drag_x);
    int right_x = std::max(this->click_x, drag_x);
    this->num_vehicles = 0;
 
    Vehicle *v = Vehicle::Get(this->window_number);
    /* Find the vehicle part that was clicked. */
    switch (v->type) {
      case VEH_TRAIN: {
        /* Don't select anything if we are not clicking in the vehicle. */
        if (left_x >= 0) {
          const Train *u = Train::From(v);
          bool start_counting = false;
          for (; u != nullptr; u = u->Next()) {
            int current_width = u->GetDisplayImageWidth();
            left_x  -= current_width;
            right_x -= current_width;
 
            if (left_x < 0 && !start_counting) {
              this->selected_vehicle = u->index;
              start_counting = true;
 
              /* Count the first vehicle, even if articulated part */
              this->num_vehicles++;
            } else if (start_counting && !u->IsArticulatedPart()) {
              /* Do not count articulated parts */
              this->num_vehicles++;
            }
 
            if (right_x < 0) break;
          }
        }
 
        /* If the selection is not correct, clear it. */
        if (this->num_vehicles != 0) {
          if (_ctrl_pressed) this->num_vehicles = UINT8_MAX;
          break;
        }
        [[fallthrough]];
      }
 
      default:
        /* Clear the selection. */
        this->selected_vehicle = v->index;
        this->num_vehicles = UINT8_MAX;
        break;
    }
  }
 
  void OnClick([[maybe_unused]] Point pt, WidgetID widget, [[maybe_unused]] int click_count) override
  {
    switch (widget) {
      case WID_VR_VEHICLE_PANEL_DISPLAY: { // Vehicle image.
        if (this->order != INVALID_VEH_ORDER_ID) break;
        NWidgetBase *nwi = this->GetWidget<NWidgetBase>(WID_VR_VEHICLE_PANEL_DISPLAY);
        this->click_x = GetClickPosition(pt.x - nwi->pos_x);
        this->SetSelectedVehicles(pt.x - nwi->pos_x);
        this->SetWidgetDirty(WID_VR_VEHICLE_PANEL_DISPLAY);
        if (!_ctrl_pressed) {
          SetObjectToPlaceWnd(SPR_CURSOR_MOUSE, PAL_NONE, HT_DRAG, this);
        } else {
          /* The vehicle selection has changed. */
          this->InvalidateData(2);
        }
        break;
      }
 
      case WID_VR_MATRIX: { // listbox
        this->SetSelection(this->vscroll->GetScrolledRowFromWidget(pt.y, this, WID_VR_MATRIX));
        this->SetWidgetDisabledState(WID_VR_REFIT, this->selected_refit == nullptr);
        this->InvalidateData(1);
 
        if (click_count == 1) break;
        [[fallthrough]];
      }
 
      case WID_VR_REFIT: // refit button
        if (this->selected_refit != nullptr) {
          const Vehicle *v = Vehicle::Get(this->window_number);
 
          if (this->order == INVALID_VEH_ORDER_ID) {
            bool delete_window = this->selected_vehicle == v->index && this->num_vehicles == UINT8_MAX;
            if (Command<Commands::RefitVehicle>::Post(GetCmdRefitVehMsg(v), v->tile, this->selected_vehicle, this->selected_refit->cargo, this->selected_refit->subtype, false, false, this->num_vehicles) && delete_window) this->Close();
          } else {
            if (Command<Commands::OrderRefit>::Post(v->tile, v->index, this->order, this->selected_refit->cargo)) this->Close();
          }
        }
        break;
    }
  }
 
  void OnMouseDrag(Point pt, WidgetID widget) override
  {
    switch (widget) {
      case WID_VR_VEHICLE_PANEL_DISPLAY: { // Vehicle image.
        if (this->order != INVALID_VEH_ORDER_ID) break;
        NWidgetBase *nwi = this->GetWidget<NWidgetBase>(WID_VR_VEHICLE_PANEL_DISPLAY);
        this->SetSelectedVehicles(pt.x - nwi->pos_x);
        this->SetWidgetDirty(WID_VR_VEHICLE_PANEL_DISPLAY);
        break;
      }
    }
  }
 
  void OnDragDrop(Point pt, WidgetID widget) override
  {
    switch (widget) {
      case WID_VR_VEHICLE_PANEL_DISPLAY: { // Vehicle image.
        if (this->order != INVALID_VEH_ORDER_ID) break;
        NWidgetBase *nwi = this->GetWidget<NWidgetBase>(WID_VR_VEHICLE_PANEL_DISPLAY);
        this->SetSelectedVehicles(pt.x - nwi->pos_x);
        this->InvalidateData(2);
        break;
      }
    }
  }
 
  void OnResize() override
  {
    this->vehicle_width = GetVehicleWidth(Vehicle::Get(this->window_number), EIT_IN_DETAILS);
    this->vscroll->SetCapacityFromWidget(this, WID_VR_MATRIX);
    if (this->hscroll != nullptr) this->hscroll->SetCapacityFromWidget(this, WID_VR_VEHICLE_PANEL_DISPLAY);
  }
};
 
static constexpr std::initializer_list<NWidgetPart> _nested_vehicle_refit_widgets = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_GREY),
    NWidget(WWT_CAPTION, COLOUR_GREY, WID_VR_CAPTION),
    NWidget(WWT_DEFSIZEBOX, COLOUR_GREY),
  EndContainer(),
  /* Vehicle display + scrollbar. */
  NWidget(NWID_VERTICAL),
    NWidget(WWT_PANEL, COLOUR_GREY, WID_VR_VEHICLE_PANEL_DISPLAY), SetMinimalSize(228, 14), SetResize(1, 0), SetScrollbar(WID_VR_HSCROLLBAR), EndContainer(),
    NWidget(NWID_SELECTION, INVALID_COLOUR, WID_VR_SHOW_HSCROLLBAR),
      NWidget(NWID_HSCROLLBAR, COLOUR_GREY, WID_VR_HSCROLLBAR),
    EndContainer(),
  EndContainer(),
  NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_VR_SELECT_HEADER), SetStringTip(STR_REFIT_TITLE), SetResize(1, 0),
  /* Matrix + scrollbar. */
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_MATRIX, COLOUR_GREY, WID_VR_MATRIX), SetMinimalSize(228, 112), SetResize(1, 14), SetFill(1, 1), SetMatrixDataTip(1, 0), SetScrollbar(WID_VR_SCROLLBAR),
    NWidget(NWID_VSCROLLBAR, COLOUR_GREY, WID_VR_SCROLLBAR),
  EndContainer(),
  NWidget(WWT_PANEL, COLOUR_GREY, WID_VR_INFO), SetMinimalTextLines(2, WidgetDimensions::unscaled.framerect.Vertical()), SetResize(1, 0), EndContainer(),
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_VR_REFIT), SetFill(1, 0), SetResize(1, 0),
    NWidget(WWT_RESIZEBOX, COLOUR_GREY),
  EndContainer(),
};
 
static WindowDesc _vehicle_refit_desc(
  WDP_AUTO, "view_vehicle_refit", 240, 174,
  WC_VEHICLE_REFIT, WC_VEHICLE_VIEW,
  WindowDefaultFlag::Construction,
  _nested_vehicle_refit_widgets
);

void ShowVehicleRefitWindow(const Vehicle *v, VehicleOrderID order, Window *parent, bool auto_refit)
{
  CloseWindowById(WC_VEHICLE_REFIT, v->index);
  RefitWindow *w = new RefitWindow(_vehicle_refit_desc, v, order, auto_refit);
  w->parent = parent;
}

uint ShowRefitOptionsList(int left, int right, int y, EngineID engine)
{
  /* List of cargo types of this engine */
  CargoTypes cmask = GetUnionOfArticulatedRefitMasks(engine, false);
  /* List of cargo types available in this climate */
  CargoTypes lmask = _cargo_mask;
 
  /* Draw nothing if the engine is not refittable */
  if (HasAtMostOneBit(cmask)) return y;
 
  std::string str;
  if (cmask == lmask) {
    /* Engine can be refitted to all types in this climate */
    str = GetString(STR_PURCHASE_INFO_REFITTABLE_TO, STR_PURCHASE_INFO_ALL_TYPES, std::monostate{});
  } else {
    /* Check if we are able to refit to more cargo types and unable to. If
     * so, invert the cargo types to list those that we can't refit to. */
    if (CountBits(cmask ^ lmask) < CountBits(cmask) && CountBits(cmask ^ lmask) <= 7) {
      cmask ^= lmask;
      str = GetString(STR_PURCHASE_INFO_REFITTABLE_TO, STR_PURCHASE_INFO_ALL_BUT, cmask);
    } else {
      str = GetString(STR_PURCHASE_INFO_REFITTABLE_TO, STR_JUST_CARGO_LIST, cmask);
    }
  }
 
  return DrawStringMultiLine(left, right, y, INT32_MAX, str);
}

StringID GetCargoSubtypeText(const Vehicle *v)
{
  if (!EngInfo(v->engine_type)->callback_mask.Test(VehicleCallbackMask::CargoSuffix)) return STR_EMPTY;
  std::array<int32_t, 1> regs100;
  uint16_t cb = GetVehicleCallback(CBID_VEHICLE_CARGO_SUFFIX, 0, 0, v->engine_type, v, regs100);
  if (v->GetGRF()->grf_version < 8 && cb == 0xFF) return STR_EMPTY;
  if (cb == CALLBACK_FAILED || cb == 0x400) return STR_EMPTY;
  if (cb == 0x40F) {
    return GetGRFStringID(v->GetGRFID(), static_cast<GRFStringID>(regs100[0]));
  }
  if (cb > 0x400) {
    ErrorUnknownCallbackResult(v->GetGRFID(), CBID_VEHICLE_CARGO_SUFFIX, cb);
    return STR_EMPTY;
  }
  return GetGRFStringID(v->GetGRFID(), GRFSTR_MISC_GRF_TEXT + cb);
}

static bool VehicleGroupLengthSorter(const GUIVehicleGroup &a, const GUIVehicleGroup &b)
{
  return a.NumVehicles() < b.NumVehicles();
}

static bool VehicleGroupTotalProfitThisYearSorter(const GUIVehicleGroup &a, const GUIVehicleGroup &b)
{
  return a.GetDisplayProfitThisYear() < b.GetDisplayProfitThisYear();
}

static bool VehicleGroupTotalProfitLastYearSorter(const GUIVehicleGroup &a, const GUIVehicleGroup &b)
{
  return a.GetDisplayProfitLastYear() < b.GetDisplayProfitLastYear();
}

static bool VehicleGroupAverageProfitThisYearSorter(const GUIVehicleGroup &a, const GUIVehicleGroup &b)
{
  return a.GetDisplayProfitThisYear() * static_cast<uint>(b.NumVehicles()) < b.GetDisplayProfitThisYear() * static_cast<uint>(a.NumVehicles());
}

static bool VehicleGroupAverageProfitLastYearSorter(const GUIVehicleGroup &a, const GUIVehicleGroup &b)
{
  return a.GetDisplayProfitLastYear() * static_cast<uint>(b.NumVehicles()) < b.GetDisplayProfitLastYear() * static_cast<uint>(a.NumVehicles());
}

static bool VehicleNumberSorter(const Vehicle * const &a, const Vehicle * const &b)
{
  return a->unitnumber < b->unitnumber;
}

static bool VehicleNameSorter(const Vehicle * const &a, const Vehicle * const &b)
{
  static std::string last_name[2] = { {}, {} };
 
  if (a != _last_vehicle[0]) {
    _last_vehicle[0] = a;
    last_name[0] = GetString(STR_VEHICLE_NAME, a->index);
  }
 
  if (b != _last_vehicle[1]) {
    _last_vehicle[1] = b;
    last_name[1] = GetString(STR_VEHICLE_NAME, b->index);
  }
 
  int r = StrNaturalCompare(last_name[0], last_name[1]); // Sort by name (natural sorting).
  return (r != 0) ? r < 0: VehicleNumberSorter(a, b);
}

static bool VehicleAgeSorter(const Vehicle * const &a, const Vehicle * const &b)
{
  auto r = a->age - b->age;
  return (r != 0) ? r < 0 : VehicleNumberSorter(a, b);
}

static bool VehicleProfitThisYearSorter(const Vehicle * const &a, const Vehicle * const &b)
{
  int r = ClampTo<int32_t>(a->GetDisplayProfitThisYear() - b->GetDisplayProfitThisYear());
  return (r != 0) ? r < 0 : VehicleNumberSorter(a, b);
}

static bool VehicleProfitLastYearSorter(const Vehicle * const &a, const Vehicle * const &b)
{
  int r = ClampTo<int32_t>(a->GetDisplayProfitLastYear() - b->GetDisplayProfitLastYear());
  return (r != 0) ? r < 0 : VehicleNumberSorter(a, b);
}

static bool VehicleCargoSorter(const Vehicle * const &a, const Vehicle * const &b)
{
  const Vehicle *v;
  CargoArray diff{};
 
  /* Append the cargo of the connected waggons */
  for (v = a; v != nullptr; v = v->Next()) diff[v->cargo_type] += v->cargo_cap;
  for (v = b; v != nullptr; v = v->Next()) diff[v->cargo_type] -= v->cargo_cap;
 
  int r = 0;
  for (uint d : diff) {
    r = d;
    if (r != 0) break;
  }
 
  return (r != 0) ? r < 0 : VehicleNumberSorter(a, b);
}

static bool VehicleReliabilitySorter(const Vehicle * const &a, const Vehicle * const &b)
{
  int r = a->reliability - b->reliability;
  return (r != 0) ? r < 0 : VehicleNumberSorter(a, b);
}

static bool VehicleMaxSpeedSorter(const Vehicle * const &a, const Vehicle * const &b)
{
  int r = a->vcache.cached_max_speed - b->vcache.cached_max_speed;
  return (r != 0) ? r < 0 : VehicleNumberSorter(a, b);
}

static bool VehicleModelSorter(const Vehicle * const &a, const Vehicle * const &b)
{
  int r = a->engine_type.base() - b->engine_type.base();
  return (r != 0) ? r < 0 : VehicleNumberSorter(a, b);
}

static bool VehicleValueSorter(const Vehicle * const &a, const Vehicle * const &b)
{
  const Vehicle *u;
  Money diff = 0;
 
  for (u = a; u != nullptr; u = u->Next()) diff += u->value;
  for (u = b; u != nullptr; u = u->Next()) diff -= u->value;
 
  int r = ClampTo<int32_t>(diff);
  return (r != 0) ? r < 0 : VehicleNumberSorter(a, b);
}

static bool VehicleLengthSorter(const Vehicle * const &a, const Vehicle * const &b)
{
  int r = a->GetGroundVehicleCache()->cached_total_length - b->GetGroundVehicleCache()->cached_total_length;
  return (r != 0) ? r < 0 : VehicleNumberSorter(a, b);
}

static bool VehicleTimeToLiveSorter(const Vehicle * const &a, const Vehicle * const &b)
{
  int r = ClampTo<int32_t>((a->max_age - a->age) - (b->max_age - b->age));
  return (r != 0) ? r < 0 : VehicleNumberSorter(a, b);
}

static bool VehicleTimetableDelaySorter(const Vehicle * const &a, const Vehicle * const &b)
{
  int r = a->lateness_counter - b->lateness_counter;
  return (r != 0) ? r < 0 : VehicleNumberSorter(a, b);
}
 
void InitializeGUI()
{
  _grouping = {};
  _sorting = {};
}

static inline void ChangeVehicleWindow(WindowClass window_class, VehicleID from_index, VehicleID to_index)
{
  Window *w = FindWindowById(window_class, from_index);
  if (w != nullptr) {
    /* Update window_number */
    w->window_number = to_index;
    if (w->viewport != nullptr) w->viewport->follow_vehicle = to_index;
 
    /* Update vehicle drag data */
    if (_thd.window_class == window_class && _thd.window_number == from_index) {
      _thd.window_number = to_index;
    }
 
    /* Notify the window. */
    w->InvalidateData(VIWD_AUTOREPLACE, false);
  }
}

void ChangeVehicleViewWindow(VehicleID from_index, VehicleID to_index)
{
  ChangeVehicleWindow(WC_VEHICLE_VIEW,      from_index, to_index);
  ChangeVehicleWindow(WC_VEHICLE_ORDERS,    from_index, to_index);
  ChangeVehicleWindow(WC_VEHICLE_REFIT,     from_index, to_index);
  ChangeVehicleWindow(WC_VEHICLE_DETAILS,   from_index, to_index);
  ChangeVehicleWindow(WC_VEHICLE_TIMETABLE, from_index, to_index);
}
 
static constexpr std::initializer_list<NWidgetPart> _nested_vehicle_list = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_GREY),
    NWidget(NWID_SELECTION, INVALID_COLOUR, WID_VL_CAPTION_SELECTION),
      NWidget(WWT_CAPTION, COLOUR_GREY, WID_VL_CAPTION),
      NWidget(NWID_HORIZONTAL),
        NWidget(WWT_CAPTION, COLOUR_GREY, WID_VL_CAPTION_SHARED_ORDERS),
        NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_VL_ORDER_VIEW), SetMinimalSize(61, 14), SetStringTip(STR_GOTO_ORDER_VIEW, STR_GOTO_ORDER_VIEW_TOOLTIP),
      EndContainer(),
    EndContainer(),
    NWidget(WWT_SHADEBOX, COLOUR_GREY),
    NWidget(WWT_DEFSIZEBOX, COLOUR_GREY),
    NWidget(WWT_STICKYBOX, COLOUR_GREY),
  EndContainer(),
 
  NWidget(NWID_HORIZONTAL),
    NWidget(NWID_VERTICAL, NWidContainerFlag::EqualSize),
      NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_VL_GROUP_ORDER), SetMinimalSize(0, 12), SetFill(1, 1), SetStringTip(STR_STATION_VIEW_GROUP, STR_TOOLTIP_GROUP_ORDER),
      NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_VL_SORT_ORDER), SetMinimalSize(0, 12), SetFill(1, 1), SetStringTip(STR_BUTTON_SORT_BY, STR_TOOLTIP_SORT_ORDER),
    EndContainer(),
    NWidget(NWID_VERTICAL, NWidContainerFlag::EqualSize),
      NWidget(WWT_DROPDOWN, COLOUR_GREY, WID_VL_GROUP_BY_PULLDOWN), SetMinimalSize(0, 12), SetFill(1, 1), SetToolTip(STR_TOOLTIP_GROUP_ORDER),
      NWidget(WWT_DROPDOWN, COLOUR_GREY, WID_VL_SORT_BY_PULLDOWN), SetMinimalSize(0, 12), SetFill(1, 1), SetToolTip(STR_TOOLTIP_SORT_CRITERIA),
    EndContainer(),
    NWidget(NWID_VERTICAL, NWidContainerFlag::EqualSize),
      NWidget(WWT_PANEL, COLOUR_GREY), SetMinimalSize(0, 12), SetFill(1, 1), SetResize(1, 0), EndContainer(),
      NWidget(NWID_HORIZONTAL),
        NWidget(NWID_SELECTION, INVALID_COLOUR, WID_VL_FILTER_BY_CARGO_SEL),
          NWidget(WWT_DROPDOWN, COLOUR_GREY, WID_VL_FILTER_BY_CARGO), SetMinimalSize(0, 12), SetFill(0, 1), SetToolTip(STR_TOOLTIP_FILTER_CRITERIA),
        EndContainer(),
        NWidget(WWT_PANEL, COLOUR_GREY), SetMinimalSize(0, 12), SetFill(1, 1), SetResize(1, 0), EndContainer(),
      EndContainer(),
    EndContainer(),
  EndContainer(),
 
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_MATRIX, COLOUR_GREY, WID_VL_LIST), SetMinimalSize(248, 0), SetFill(1, 0), SetResize(1, 1), SetMatrixDataTip(1, 0), SetScrollbar(WID_VL_SCROLLBAR),
    NWidget(NWID_VSCROLLBAR, COLOUR_GREY, WID_VL_SCROLLBAR),
  EndContainer(),
 
  NWidget(NWID_HORIZONTAL),
    NWidget(NWID_SELECTION, INVALID_COLOUR, WID_VL_HIDE_BUTTONS),
      NWidget(NWID_HORIZONTAL),
        NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_VL_AVAILABLE_VEHICLES), SetMinimalSize(106, 12), SetFill(0, 1),
                SetToolTip(STR_VEHICLE_LIST_AVAILABLE_ENGINES_TOOLTIP),
        NWidget(WWT_PANEL, COLOUR_GREY), SetMinimalSize(0, 12), SetResize(1, 0), SetFill(1, 1), EndContainer(),
        NWidget(WWT_DROPDOWN, COLOUR_GREY, WID_VL_MANAGE_VEHICLES_DROPDOWN), SetMinimalSize(118, 12), SetFill(0, 1),
                SetStringTip(STR_VEHICLE_LIST_MANAGE_LIST, STR_VEHICLE_LIST_MANAGE_LIST_TOOLTIP),
        NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_VL_STOP_ALL), SetAspect(WidgetDimensions::ASPECT_VEHICLE_FLAG), SetFill(0, 1),
                SetSpriteTip(SPR_FLAG_VEH_STOPPED, STR_VEHICLE_LIST_MASS_STOP_LIST_TOOLTIP),
        NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_VL_START_ALL), SetAspect(WidgetDimensions::ASPECT_VEHICLE_FLAG), SetFill(0, 1),
                SetSpriteTip(SPR_FLAG_VEH_RUNNING, STR_VEHICLE_LIST_MASS_START_LIST_TOOLTIP),
      EndContainer(),
      /* Widget to be shown for other companies hiding the previous 5 widgets. */
      NWidget(WWT_PANEL, COLOUR_GREY), SetFill(1, 1), SetResize(1, 0), EndContainer(),
    EndContainer(),
    NWidget(WWT_RESIZEBOX, COLOUR_GREY),
  EndContainer(),
};
 
static void DrawSmallOrderList(const Vehicle *v, int left, int right, int y, uint order_arrow_width, VehicleOrderID start)
{
  auto orders = v->Orders();
  if (orders.empty()) return;
 
  bool rtl = _current_text_dir == TD_RTL;
  int l_offset = rtl ? 0 : order_arrow_width;
  int r_offset = rtl ? order_arrow_width : 0;
  int i = 0;
  VehicleOrderID oid = start;
 
  do {
    if (oid == v->cur_real_order_index) DrawString(left, right, y, rtl ? STR_JUST_LEFT_ARROW : STR_JUST_RIGHT_ARROW, TC_BLACK, SA_LEFT, false, FS_SMALL);
 
    if (orders[oid].IsType(OT_GOTO_STATION)) {
      DrawString(left + l_offset, right - r_offset, y, GetString(STR_STATION_NAME, orders[oid].GetDestination()), TC_BLACK, SA_LEFT, false, FS_SMALL);
 
      y += GetCharacterHeight(FS_SMALL);
      if (++i == 4) break;
    }
 
    oid = v->orders->GetNext(oid);
  } while (oid != start);
}

static void DrawSmallOrderList(const OrderList *orderlist, int left, int right, int y, uint order_arrow_width)
{
  if (orderlist == nullptr) return;
 
  bool rtl = _current_text_dir == TD_RTL;
  int l_offset = rtl ? 0 : order_arrow_width;
  int r_offset = rtl ? order_arrow_width : 0;
  int i = 0;
 
  for (const Order &order : orderlist->GetOrders()) {
    if (order.IsType(OT_GOTO_STATION)) {
      DrawString(left + l_offset, right - r_offset, y, GetString(STR_STATION_NAME, order.GetDestination()), TC_BLACK, SA_LEFT, false, FS_SMALL);
 
      y += GetCharacterHeight(FS_SMALL);
      if (++i == 4) break;
    }
  }
}

void DrawVehicleImage(const Vehicle *v, const Rect &r, VehicleID selection, EngineImageType image_type, int skip)
{
  switch (v->type) {
    case VEH_TRAIN:    DrawTrainImage(Train::From(v), r, selection, image_type, skip); break;
    case VEH_ROAD:     DrawRoadVehImage(v, r, selection, image_type, skip);  break;
    case VEH_SHIP:     DrawShipImage(v, r, selection, image_type);     break;
    case VEH_AIRCRAFT: DrawAircraftImage(v, r, selection, image_type); break;
    default: NOT_REACHED();
  }
}

uint GetVehicleListHeight(VehicleType type, uint divisor)
{
  /* Name + vehicle + profit */
  uint base = ScaleGUITrad(GetVehicleHeight(type)) + 2 * GetCharacterHeight(FS_SMALL) + WidgetDimensions::scaled.matrix.Vertical();
  /* Drawing of the 4 small orders + profit*/
  if (type >= VEH_SHIP) base = std::max(base, 6U * GetCharacterHeight(FS_SMALL) + WidgetDimensions::scaled.matrix.Vertical());
 
  if (divisor == 1) return base;
 
  /* Make sure the height is dividable by divisor */
  uint rem = base % divisor;
  return base + (rem == 0 ? 0 : divisor - rem);
}

static int GetUnitNumberWidth(int digits)
{
  return GetStringBoundingBox(GetString(STR_JUST_COMMA, GetParamMaxDigits(digits))).width;
}

void BaseVehicleListWindow::DrawVehicleListItems(VehicleID selected_vehicle, int line_height, const Rect &r) const
{
  Rect ir = r.WithHeight(line_height).Shrink(WidgetDimensions::scaled.matrix, RectPadding::zero);
  bool rtl = _current_text_dir == TD_RTL;
 
  Dimension profit = GetSpriteSize(SPR_PROFIT_LOT);
  int text_offset = std::max<int>(profit.width, GetUnitNumberWidth(this->unitnumber_digits)) + WidgetDimensions::scaled.hsep_normal;
  Rect tr = ir.Indent(text_offset, rtl);
 
  bool show_orderlist = this->vli.vtype >= VEH_SHIP;
  Rect olr = ir.Indent(std::max(ScaleGUITrad(100) + text_offset, ir.Width() / 2), rtl);
 
  int image_left  = (rtl && show_orderlist) ? olr.right : tr.left;
  int image_right = (!rtl && show_orderlist) ? olr.left : tr.right;
 
  int vehicle_button_x = rtl ? ir.right - profit.width : ir.left;
 
  auto [first, last] = this->vscroll->GetVisibleRangeIterators(this->vehgroups);
  for (auto it = first; it != last; ++it) {
    const GUIVehicleGroup &vehgroup = *it;
 
    DrawString(tr.left, tr.right, ir.bottom - GetCharacterHeight(FS_SMALL) - WidgetDimensions::scaled.framerect.bottom,
        GetString(TimerGameEconomy::UsingWallclockUnits() ? STR_VEHICLE_LIST_PROFIT_THIS_PERIOD_LAST_PERIOD : STR_VEHICLE_LIST_PROFIT_THIS_YEAR_LAST_YEAR,
            vehgroup.GetDisplayProfitThisYear(),
            vehgroup.GetDisplayProfitLastYear()));
 
    DrawVehicleProfitButton(vehgroup.GetOldestVehicleAge(), vehgroup.GetDisplayProfitLastYear(), vehgroup.NumVehicles(), vehicle_button_x, ir.top + GetCharacterHeight(FS_NORMAL) + WidgetDimensions::scaled.vsep_normal);
 
    switch (this->grouping) {
      case GB_NONE: {
        const Vehicle *v = vehgroup.GetSingleVehicle();
 
        if (v->vehicle_flags.Test(VehicleFlag::PathfinderLost)) {
          DrawSprite(SPR_WARNING_SIGN, PAL_NONE, vehicle_button_x, ir.top + GetCharacterHeight(FS_NORMAL) + WidgetDimensions::scaled.vsep_normal + profit.height);
        }
 
        DrawVehicleImage(v, ir.WithX(image_left, image_right), selected_vehicle, EIT_IN_LIST, 0);
 
        if (_settings_client.gui.show_cargo_in_vehicle_lists) {
          /* Get the cargoes the vehicle can carry */
          CargoTypes vehicle_cargoes = 0;
 
          for (auto u = v; u != nullptr; u = u->Next()) {
            if (u->cargo_cap == 0) continue;
 
            SetBit(vehicle_cargoes, u->cargo_type);
          }
 
          if (!v->name.empty()) {
            /* The vehicle got a name so we will print it and the cargoes */
            DrawString(tr.left, tr.right, ir.top,
                GetString(STR_VEHICLE_LIST_NAME_AND_CARGO, STR_VEHICLE_NAME, v->index, STR_VEHICLE_LIST_CARGO, vehicle_cargoes),
                TC_BLACK, SA_LEFT, false, FS_SMALL);
          } else if (v->group_id != DEFAULT_GROUP) {
            /* The vehicle has no name, but is member of a group, so print group name and the cargoes */
            DrawString(tr.left, tr.right, ir.top,
                GetString(STR_VEHICLE_LIST_NAME_AND_CARGO, STR_GROUP_NAME, v->group_id, STR_VEHICLE_LIST_CARGO, vehicle_cargoes),
                TC_BLACK, SA_LEFT, false, FS_SMALL);
          } else {
            /* The vehicle has no name, and is not a member of a group, so just print the cargoes */
            DrawString(tr.left, tr.right, ir.top, GetString(STR_VEHICLE_LIST_CARGO, vehicle_cargoes), TC_BLACK, SA_LEFT, false, FS_SMALL);
          }
        } else if (!v->name.empty()) {
          /* The vehicle got a name so we will print it */
          DrawString(tr.left, tr.right, ir.top, GetString(STR_VEHICLE_NAME, v->index), TC_BLACK, SA_LEFT, false, FS_SMALL);
        } else if (v->group_id != DEFAULT_GROUP) {
          /* The vehicle has no name, but is member of a group, so print group name */
          DrawString(tr.left, tr.right, ir.top, GetString(STR_GROUP_NAME, v->group_id), TC_BLACK, SA_LEFT, false, FS_SMALL);
        }
 
        if (show_orderlist) DrawSmallOrderList(v, olr.left, olr.right, ir.top + GetCharacterHeight(FS_SMALL), this->order_arrow_width, v->cur_real_order_index);
 
        TextColour tc;
        if (v->IsChainInDepot()) {
          tc = TC_BLUE;
        } else {
          tc = (v->age > v->max_age - CalendarTime::DAYS_IN_LEAP_YEAR) ? TC_RED : TC_BLACK;
        }
 
        DrawString(ir.left, ir.right, ir.top + WidgetDimensions::scaled.framerect.top, GetString(STR_JUST_COMMA, v->unitnumber), tc);
        break;
      }
 
      case GB_SHARED_ORDERS:
        assert(vehgroup.NumVehicles() > 0);
 
        for (int i = 0; i < static_cast<int>(vehgroup.NumVehicles()); ++i) {
          if (image_left + WidgetDimensions::scaled.hsep_wide * i >= image_right) break; // Break if there is no more space to draw any more vehicles anyway.
          DrawVehicleImage(vehgroup.vehicles_begin[i], ir.WithX(image_left + WidgetDimensions::scaled.hsep_wide * i, image_right), selected_vehicle, EIT_IN_LIST, 0);
        }
 
        if (show_orderlist) DrawSmallOrderList(vehgroup.vehicles_begin[0]->orders, olr.left, olr.right, ir.top + GetCharacterHeight(FS_SMALL), this->order_arrow_width);
 
        DrawString(ir.left, ir.right, ir.top + WidgetDimensions::scaled.framerect.top, GetString(STR_JUST_COMMA, vehgroup.NumVehicles()), TC_BLACK);
        break;
 
      default:
        NOT_REACHED();
    }
 
    ir = ir.Translate(0, line_height);
  }
}
 
void BaseVehicleListWindow::UpdateSortingFromGrouping()
{
  /* Set up sorting. Make the window-specific _sorting variable
   * point to the correct global _sorting struct so we are freed
   * from having conditionals during window operation */
  switch (this->vli.vtype) {
    case VEH_TRAIN:    this->sorting = &_sorting[this->grouping].train; break;
    case VEH_ROAD:     this->sorting = &_sorting[this->grouping].roadveh; break;
    case VEH_SHIP:     this->sorting = &_sorting[this->grouping].ship; break;
    case VEH_AIRCRAFT: this->sorting = &_sorting[this->grouping].aircraft; break;
    default: NOT_REACHED();
  }
  this->vehgroups.SetSortFuncs(this->GetVehicleSorterFuncs());
  this->vehgroups.SetListing(*this->sorting);
  this->vehgroups.ForceRebuild();
  this->vehgroups.NeedResort();
}
 
void BaseVehicleListWindow::UpdateVehicleGroupBy(GroupBy group_by)
{
  if (this->grouping != group_by) {
    /* Save the old sorting option, so that if we change the grouping option back later on,
     * UpdateSortingFromGrouping() will automatically restore the saved sorting option. */
    *this->sorting = this->vehgroups.GetListing();
 
    this->grouping = group_by;
    _grouping[this->vli.type][this->vli.vtype] = group_by;
    this->UpdateSortingFromGrouping();
  }
}

struct VehicleListWindow : public BaseVehicleListWindow {
private:
  enum ButtonPlanes : uint8_t {
    BP_SHOW_BUTTONS, 
    BP_HIDE_BUTTONS, 
  };

  enum CaptionPlanes : uint8_t {
    BP_NORMAL,        
    BP_SHARED_ORDERS, 
  };
 
public:
  VehicleListWindow(WindowDesc &desc, WindowNumber window_number, const VehicleListIdentifier &vli) : BaseVehicleListWindow(desc, vli)
  {
    this->CreateNestedTree();
 
    this->GetWidget<NWidgetStacked>(WID_VL_FILTER_BY_CARGO_SEL)->SetDisplayedPlane((this->vli.type == VL_SHARED_ORDERS) ? SZSP_NONE : 0);
 
    this->vscroll = this->GetScrollbar(WID_VL_SCROLLBAR);
 
    /* Set up the window widgets */
    this->GetWidget<NWidgetCore>(WID_VL_LIST)->SetToolTip(STR_VEHICLE_LIST_TRAIN_LIST_TOOLTIP + this->vli.vtype);
 
    NWidgetStacked *nwi = this->GetWidget<NWidgetStacked>(WID_VL_CAPTION_SELECTION);
    if (this->vli.type == VL_SHARED_ORDERS) {
      this->GetWidget<NWidgetCore>(WID_VL_CAPTION_SHARED_ORDERS)->SetString(STR_VEHICLE_LIST_SHARED_ORDERS_LIST_CAPTION);
      /* If we are in the shared orders window, then disable the group-by dropdown menu.
       * Remove this when the group-by dropdown menu has another option apart from grouping by shared orders. */
      this->SetWidgetDisabledState(WID_VL_GROUP_ORDER, true);
      this->SetWidgetDisabledState(WID_VL_GROUP_BY_PULLDOWN, true);
      nwi->SetDisplayedPlane(BP_SHARED_ORDERS);
    } else {
      this->GetWidget<NWidgetCore>(WID_VL_CAPTION)->SetString(STR_VEHICLE_LIST_TRAIN_CAPTION + this->vli.vtype);
      nwi->SetDisplayedPlane(BP_NORMAL);
    }
 
    this->FinishInitNested(window_number);
    if (this->vli.company != OWNER_NONE) this->owner = this->vli.company;
 
    this->BuildVehicleList();
    this->SortVehicleList();
  }
 
  ~VehicleListWindow() override
  {
    *this->sorting = this->vehgroups.GetListing();
  }
 
  void UpdateWidgetSize(WidgetID widget, Dimension &size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension &fill, [[maybe_unused]] Dimension &resize) override
  {
    switch (widget) {
      case WID_VL_LIST:
        fill.height = resize.height = GetVehicleListHeight(this->vli.vtype, 1);
 
        switch (this->vli.vtype) {
          case VEH_TRAIN:
          case VEH_ROAD:
            size.height = 6 * resize.height;
            break;
          case VEH_SHIP:
          case VEH_AIRCRAFT:
            size.height = 4 * resize.height;
            break;
          default: NOT_REACHED();
        }
        break;
 
      case WID_VL_SORT_ORDER: {
        Dimension d = GetStringBoundingBox(this->GetWidget<NWidgetCore>(widget)->GetString());
        d.width += padding.width + Window::SortButtonWidth() * 2; // Doubled since the string is centred and it also looks better.
        d.height += padding.height;
        size = maxdim(size, d);
        break;
      }
 
      case WID_VL_GROUP_BY_PULLDOWN:
        size.width = GetStringListWidth(this->vehicle_group_by_names) + padding.width;
        break;
 
      case WID_VL_SORT_BY_PULLDOWN:
        size.width = GetStringListWidth(this->vehicle_group_none_sorter_names_calendar);
        size.width = std::max(size.width, GetStringListWidth(this->vehicle_group_none_sorter_names_wallclock));
        size.width = std::max(size.width, GetStringListWidth(this->vehicle_group_shared_orders_sorter_names_calendar));
        size.width = std::max(size.width, GetStringListWidth(this->vehicle_group_shared_orders_sorter_names_wallclock));
        size.width += padding.width;
        break;
 
      case WID_VL_FILTER_BY_CARGO:
        size.width = std::max(size.width, GetDropDownListDimension(this->BuildCargoDropDownList(true)).width + padding.width);
        break;
 
      case WID_VL_MANAGE_VEHICLES_DROPDOWN: {
        Dimension d = this->GetActionDropdownSize(this->vli.type == VL_STANDARD, false, true);
        d.height += padding.height;
        d.width  += padding.width;
        size = maxdim(size, d);
        break;
      }
    }
  }
 
  std::string GetWidgetString(WidgetID widget, StringID stringid) const override
  {
    switch (widget) {
      case WID_VL_AVAILABLE_VEHICLES:
        return GetString(STR_VEHICLE_LIST_AVAILABLE_TRAINS + this->vli.vtype);
 
      case WID_VL_GROUP_BY_PULLDOWN:
        return GetString(std::data(this->vehicle_group_by_names)[this->grouping]);
 
      case WID_VL_SORT_BY_PULLDOWN:
        return GetString(this->GetVehicleSorterNames()[this->vehgroups.SortType()]);
 
      case WID_VL_FILTER_BY_CARGO:
        return GetString(this->GetCargoFilterLabel(this->cargo_filter_criteria));
 
      case WID_VL_CAPTION:
      case WID_VL_CAPTION_SHARED_ORDERS: {
        switch (this->vli.type) {
          case VL_SHARED_ORDERS: // Shared Orders
            return GetString(stringid, this->vehicles.size());
 
          case VL_STANDARD: // Company Name
            return GetString(stringid, STR_COMPANY_NAME, this->vli.ToCompanyID(), std::monostate{}, this->vehicles.size());
 
          case VL_STATION_LIST: // Station/Waypoint Name
            return GetString(stringid, Station::IsExpected(BaseStation::Get(this->vli.ToStationID())) ? STR_STATION_NAME : STR_WAYPOINT_NAME, this->vli.ToStationID(), std::monostate{}, this->vehicles.size());
 
          case VL_DEPOT_LIST:
            return GetString(stringid, STR_DEPOT_CAPTION, this->vli.vtype, this->vli.ToDestinationID(), this->vehicles.size());
 
          default: NOT_REACHED();
        }
      }
 
      default:
        return this->Window::GetWidgetString(widget, stringid);
    }
  }
 
  void DrawWidget(const Rect &r, WidgetID widget) const override
  {
    switch (widget) {
      case WID_VL_SORT_ORDER:
        /* draw arrow pointing up/down for ascending/descending sorting */
        this->DrawSortButtonState(widget, this->vehgroups.IsDescSortOrder() ? SBS_DOWN : SBS_UP);
        break;
 
      case WID_VL_LIST:
        this->DrawVehicleListItems(VehicleID::Invalid(), this->resize.step_height, r);
        break;
    }
  }
 
  void OnPaint() override
  {
    this->BuildVehicleList();
    this->SortVehicleList();
 
    if (this->vehicles.empty() && this->IsWidgetLowered(WID_VL_MANAGE_VEHICLES_DROPDOWN)) {
      this->CloseChildWindows(WC_DROPDOWN_MENU);
    }
 
    /* Hide the widgets that we will not use in this window
     * Some windows contains actions only fit for the owner */
    int plane_to_show = (this->owner == _local_company) ? BP_SHOW_BUTTONS : BP_HIDE_BUTTONS;
    NWidgetStacked *nwi = this->GetWidget<NWidgetStacked>(WID_VL_HIDE_BUTTONS);
    if (plane_to_show != nwi->shown_plane) {
      nwi->SetDisplayedPlane(plane_to_show);
      nwi->SetDirty(this);
    }
    if (this->owner == _local_company) {
      this->SetWidgetDisabledState(WID_VL_AVAILABLE_VEHICLES, this->vli.type != VL_STANDARD);
      this->SetWidgetsDisabledState(this->vehicles.empty(),
        WID_VL_MANAGE_VEHICLES_DROPDOWN,
        WID_VL_STOP_ALL,
        WID_VL_START_ALL);
    }
 
    this->DrawWidgets();
  }
 
  bool last_overlay_state = false;
  void OnMouseLoop() override
  {
    if (last_overlay_state != ShowCargoIconOverlay()) {
      last_overlay_state = ShowCargoIconOverlay();
      this->SetDirty();
    }
  }
 
  void OnClick([[maybe_unused]] Point pt, WidgetID widget, [[maybe_unused]] int click_count) override
  {
    switch (widget) {
        case WID_VL_ORDER_VIEW: // Open the shared orders window
        assert(this->vli.type == VL_SHARED_ORDERS);
        assert(!this->vehicles.empty());
        ShowOrdersWindow(this->vehicles[0]);
        break;
 
      case WID_VL_SORT_ORDER: // Flip sorting method ascending/descending
        this->vehgroups.ToggleSortOrder();
        this->SetDirty();
        break;
 
      case WID_VL_GROUP_BY_PULLDOWN: // Select sorting criteria dropdown menu
        ShowDropDownMenu(this, this->vehicle_group_by_names, this->grouping, WID_VL_GROUP_BY_PULLDOWN, 0, 0);
        return;
 
      case WID_VL_SORT_BY_PULLDOWN: // Select sorting criteria dropdown menu
        ShowDropDownMenu(this, this->GetVehicleSorterNames(), this->vehgroups.SortType(), WID_VL_SORT_BY_PULLDOWN, 0,
            (this->vli.vtype == VEH_TRAIN || this->vli.vtype == VEH_ROAD) ? 0 : (1 << 10));
        return;
 
      case WID_VL_FILTER_BY_CARGO: // Cargo filter dropdown
        ShowDropDownList(this, this->BuildCargoDropDownList(false), this->cargo_filter_criteria, widget);
        break;
 
      case WID_VL_LIST: { // Matrix to show vehicles
        auto it = this->vscroll->GetScrolledItemFromWidget(this->vehgroups, pt.y, this, WID_VL_LIST);
        if (it == this->vehgroups.end()) return; // click out of list bound
 
        const GUIVehicleGroup &vehgroup = *it;
        switch (this->grouping) {
          case GB_NONE: {
            const Vehicle *v = vehgroup.GetSingleVehicle();
            if (!VehicleClicked(v)) {
              if (_ctrl_pressed) {
                ShowCompanyGroupForVehicle(v);
              } else {
                ShowVehicleViewWindow(v);
              }
            }
            break;
          }
 
          case GB_SHARED_ORDERS: {
            assert(vehgroup.NumVehicles() > 0);
            if (!VehicleClicked(vehgroup)) {
              const Vehicle *v = vehgroup.vehicles_begin[0];
              if (_ctrl_pressed) {
                ShowOrdersWindow(v);
              } else {
                if (vehgroup.NumVehicles() == 1) {
                  ShowVehicleViewWindow(v);
                } else {
                  ShowVehicleListWindow(v);
                }
              }
            }
            break;
          }
 
          default: NOT_REACHED();
        }
 
        break;
      }
 
      case WID_VL_AVAILABLE_VEHICLES:
        ShowBuildVehicleWindow(INVALID_TILE, this->vli.vtype);
        break;
 
      case WID_VL_MANAGE_VEHICLES_DROPDOWN: {
        ShowDropDownList(this, this->BuildActionDropdownList(this->vli.type == VL_STANDARD, false, true), 0, WID_VL_MANAGE_VEHICLES_DROPDOWN);
        break;
      }
 
      case WID_VL_STOP_ALL:
      case WID_VL_START_ALL:
        Command<Commands::MassStartStop>::Post(TileIndex{}, widget == WID_VL_START_ALL, true, this->vli);
        break;
    }
  }
 
  void OnDropdownSelect(WidgetID widget, int index, int) override
  {
    switch (widget) {
      case WID_VL_GROUP_BY_PULLDOWN:
        this->UpdateVehicleGroupBy(static_cast<GroupBy>(index));
        break;
 
      case WID_VL_SORT_BY_PULLDOWN:
        this->vehgroups.SetSortType(index);
        break;
 
      case WID_VL_FILTER_BY_CARGO:
        this->SetCargoFilter(index);
        break;
 
      case WID_VL_MANAGE_VEHICLES_DROPDOWN:
        assert(!this->vehicles.empty());
 
        switch (index) {
          case ADI_REPLACE: // Replace window
            ShowReplaceGroupVehicleWindow(ALL_GROUP, this->vli.vtype);
            break;
          case ADI_SERVICE: // Send for servicing
          case ADI_DEPOT: // Send to Depots
            Command<Commands::SendVehicleToDepot>::Post(GetCmdSendToDepotMsg(this->vli.vtype), VehicleID::Invalid(), (index == ADI_SERVICE ? DepotCommandFlag::Service : DepotCommandFlags{}) | DepotCommandFlag::MassSend, this->vli);
            break;
 
          case ADI_CREATE_GROUP: // Create group
            Command<Commands::AddVehicleToGroup>::Post(CcAddVehicleNewGroup, NEW_GROUP, VehicleID::Invalid(), false, this->vli);
            break;
 
          default: NOT_REACHED();
        }
        break;
 
      default: NOT_REACHED();
    }
    this->SetDirty();
  }
 
  void OnGameTick() override
  {
    if (this->vehgroups.NeedResort()) {
      StationID station = (this->vli.type == VL_STATION_LIST) ? this->vli.ToStationID() : StationID::Invalid();
 
      Debug(misc, 3, "Periodic resort {} list company {} at station {}", this->vli.vtype, this->owner, station);
      this->SetDirty();
    }
  }
 
  void OnResize() override
  {
    this->vscroll->SetCapacityFromWidget(this, WID_VL_LIST);
  }

  void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
  {
    if (!gui_scope && HasBit(data, 31) && this->vli.type == VL_SHARED_ORDERS) {
      /* Needs to be done in command-scope, so everything stays valid */
      this->vli.SetIndex(GB(data, 0, 20));
      this->window_number = this->vli.ToWindowNumber();
      this->vehgroups.ForceRebuild();
      return;
    }
 
    if (data == 0) {
      /* This needs to be done in command-scope to enforce rebuilding before resorting invalid data */
      this->vehgroups.ForceRebuild();
    } else {
      this->vehgroups.ForceResort();
    }
  }
};
 
static WindowDesc _vehicle_list_desc[] = {
  {
    WDP_AUTO, "list_vehicles_train", 325, 246,
    WC_TRAINS_LIST, WC_NONE,
    {},
    _nested_vehicle_list
  },
  {
    WDP_AUTO, "list_vehicles_roadveh", 260, 246,
    WC_ROADVEH_LIST, WC_NONE,
    {},
    _nested_vehicle_list
  },
  {
    WDP_AUTO, "list_vehicles_ship", 260, 246,
    WC_SHIPS_LIST, WC_NONE,
    {},
    _nested_vehicle_list
  },
  {
    WDP_AUTO, "list_vehicles_aircraft", 260, 246,
    WC_AIRCRAFT_LIST, WC_NONE,
    {},
    _nested_vehicle_list
  }
};
 
static void ShowVehicleListWindowLocal(CompanyID company, VehicleListType vlt, VehicleType vehicle_type, uint32_t unique_number)
{
  if (!Company::IsValidID(company) && company != OWNER_NONE) return;
 
  assert(vehicle_type < std::size(_vehicle_list_desc));
  VehicleListIdentifier vli(vlt, vehicle_type, company, unique_number);
  AllocateWindowDescFront<VehicleListWindow>(_vehicle_list_desc[vehicle_type], vli.ToWindowNumber(), vli);
}
 
void ShowVehicleListWindow(CompanyID company, VehicleType vehicle_type)
{
  /* If _settings_client.gui.advanced_vehicle_list > 1, display the Advanced list
   * if _settings_client.gui.advanced_vehicle_list == 1, display Advanced list only for local company
   * if _ctrl_pressed, do the opposite action (Advanced list x Normal list)
   */
 
  if ((_settings_client.gui.advanced_vehicle_list > (uint)(company != _local_company)) != _ctrl_pressed) {
    ShowCompanyGroup(company, vehicle_type);
  } else {
    ShowVehicleListWindowLocal(company, VL_STANDARD, vehicle_type, company.base());
  }
}
 
void ShowVehicleListWindow(const Vehicle *v)
{
  ShowVehicleListWindowLocal(v->owner, VL_SHARED_ORDERS, v->type, v->FirstShared()->index.base());
}
 
void ShowVehicleListWindow(CompanyID company, VehicleType vehicle_type, StationID station)
{
  ShowVehicleListWindowLocal(company, VL_STATION_LIST, vehicle_type, station.base());
}
 
void ShowVehicleListWindow(CompanyID company, VehicleType vehicle_type, TileIndex depot_tile)
{
  ShowVehicleListWindowLocal(company, VL_DEPOT_LIST, vehicle_type, GetDepotDestinationIndex(depot_tile).base());
}
 
 
/* Unified vehicle GUI - Vehicle Details Window */
 
static_assert(WID_VD_DETAILS_CARGO_CARRIED    == WID_VD_DETAILS_CARGO_CARRIED + TDW_TAB_CARGO   );
static_assert(WID_VD_DETAILS_TRAIN_VEHICLES   == WID_VD_DETAILS_CARGO_CARRIED + TDW_TAB_INFO    );
static_assert(WID_VD_DETAILS_CAPACITY_OF_EACH == WID_VD_DETAILS_CARGO_CARRIED + TDW_TAB_CAPACITY);
static_assert(WID_VD_DETAILS_TOTAL_CARGO      == WID_VD_DETAILS_CARGO_CARRIED + TDW_TAB_TOTALS  );

static constexpr std::initializer_list<NWidgetPart> _nested_nontrain_vehicle_details_widgets = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_GREY),
    NWidget(WWT_CAPTION, COLOUR_GREY, WID_VD_CAPTION),
    NWidget(WWT_SHADEBOX, COLOUR_GREY),
    NWidget(WWT_DEFSIZEBOX, COLOUR_GREY),
    NWidget(WWT_STICKYBOX, COLOUR_GREY),
  EndContainer(),
  NWidget(WWT_PANEL, COLOUR_GREY, WID_VD_TOP_DETAILS), SetMinimalSize(405, 42), SetResize(1, 0), EndContainer(),
  NWidget(WWT_PANEL, COLOUR_GREY, WID_VD_MIDDLE_DETAILS), SetMinimalSize(405, 45), SetResize(1, 0), EndContainer(),
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_PUSHARROWBTN, COLOUR_GREY, WID_VD_DECREASE_SERVICING_INTERVAL), SetFill(0, 1),
        SetArrowWidgetTypeTip(AWV_DECREASE),
    NWidget(WWT_PUSHARROWBTN, COLOUR_GREY, WID_VD_INCREASE_SERVICING_INTERVAL), SetFill(0, 1),
        SetArrowWidgetTypeTip(AWV_INCREASE),
    NWidget(WWT_DROPDOWN, COLOUR_GREY, WID_VD_SERVICE_INTERVAL_DROPDOWN), SetFill(0, 1),
        SetStringTip(STR_EMPTY, STR_SERVICE_INTERVAL_DROPDOWN_TOOLTIP),
    NWidget(WWT_PANEL, COLOUR_GREY, WID_VD_SERVICING_INTERVAL), SetFill(1, 1), SetResize(1, 0), EndContainer(),
    NWidget(WWT_RESIZEBOX, COLOUR_GREY),
  EndContainer(),
};

static constexpr std::initializer_list<NWidgetPart> _nested_train_vehicle_details_widgets = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_GREY),
    NWidget(WWT_CAPTION, COLOUR_GREY, WID_VD_CAPTION), SetStringTip(STR_VEHICLE_DETAILS_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
    NWidget(WWT_SHADEBOX, COLOUR_GREY),
    NWidget(WWT_DEFSIZEBOX, COLOUR_GREY),
    NWidget(WWT_STICKYBOX, COLOUR_GREY),
  EndContainer(),
  NWidget(WWT_PANEL, COLOUR_GREY, WID_VD_TOP_DETAILS), SetResize(1, 0), SetMinimalSize(405, 42), EndContainer(),
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_MATRIX, COLOUR_GREY, WID_VD_MATRIX), SetResize(1, 1), SetMinimalSize(393, 45), SetMatrixDataTip(1, 0), SetFill(1, 0), SetScrollbar(WID_VD_SCROLLBAR),
    NWidget(NWID_VSCROLLBAR, COLOUR_GREY, WID_VD_SCROLLBAR),
  EndContainer(),
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_PUSHARROWBTN, COLOUR_GREY, WID_VD_DECREASE_SERVICING_INTERVAL), SetFill(0, 1),
        SetArrowWidgetTypeTip(AWV_DECREASE),
    NWidget(WWT_PUSHARROWBTN, COLOUR_GREY, WID_VD_INCREASE_SERVICING_INTERVAL), SetFill(0, 1),
        SetArrowWidgetTypeTip(AWV_INCREASE),
    NWidget(WWT_DROPDOWN, COLOUR_GREY, WID_VD_SERVICE_INTERVAL_DROPDOWN), SetFill(0, 1),
        SetStringTip(STR_EMPTY, STR_SERVICE_INTERVAL_DROPDOWN_TOOLTIP),
    NWidget(WWT_PANEL, COLOUR_GREY, WID_VD_SERVICING_INTERVAL), SetFill(1, 1), SetResize(1, 0), EndContainer(),
  EndContainer(),
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_VD_DETAILS_CARGO_CARRIED), SetMinimalSize(96, 12),
        SetStringTip(STR_VEHICLE_DETAIL_TAB_CARGO, STR_VEHICLE_DETAILS_TRAIN_CARGO_TOOLTIP), SetFill(1, 0), SetResize(1, 0),
    NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_VD_DETAILS_TRAIN_VEHICLES), SetMinimalSize(99, 12),
        SetStringTip(STR_VEHICLE_DETAIL_TAB_INFORMATION, STR_VEHICLE_DETAILS_TRAIN_INFORMATION_TOOLTIP), SetFill(1, 0), SetResize(1, 0),
    NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_VD_DETAILS_CAPACITY_OF_EACH), SetMinimalSize(99, 12),
        SetStringTip(STR_VEHICLE_DETAIL_TAB_CAPACITIES, STR_VEHICLE_DETAILS_TRAIN_CAPACITIES_TOOLTIP), SetFill(1, 0), SetResize(1, 0),
    NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_VD_DETAILS_TOTAL_CARGO), SetMinimalSize(99, 12),
        SetStringTip(STR_VEHICLE_DETAIL_TAB_TOTAL_CARGO, STR_VEHICLE_DETAILS_TRAIN_TOTAL_CARGO_TOOLTIP), SetFill(1, 0), SetResize(1, 0),
    NWidget(WWT_RESIZEBOX, COLOUR_GREY),
  EndContainer(),
};
 
 
extern int GetTrainDetailsWndVScroll(VehicleID veh_id, TrainDetailsWindowTabs det_tab);
extern void DrawTrainDetails(const Train *v, const Rect &r, int vscroll_pos, uint16_t vscroll_cap, TrainDetailsWindowTabs det_tab);
extern void DrawRoadVehDetails(const Vehicle *v, const Rect &r);
extern void DrawShipDetails(const Vehicle *v, const Rect &r);
extern void DrawAircraftDetails(const Aircraft *v, const Rect &r);
 
static const StringID _service_interval_dropdown_calendar[] = {
  STR_VEHICLE_DETAILS_DEFAULT,
  STR_VEHICLE_DETAILS_DAYS,
  STR_VEHICLE_DETAILS_PERCENT,
};
 
static const StringID _service_interval_dropdown_wallclock[] = {
  STR_VEHICLE_DETAILS_DEFAULT,
  STR_VEHICLE_DETAILS_MINUTES,
  STR_VEHICLE_DETAILS_PERCENT,
};

struct VehicleDetailsWindow : Window {
  TrainDetailsWindowTabs tab = TDW_TAB_CARGO; 
  Scrollbar *vscroll = nullptr;

  VehicleDetailsWindow(WindowDesc &desc, WindowNumber window_number) : Window(desc)
  {
    const Vehicle *v = Vehicle::Get(window_number);
 
    this->CreateNestedTree();
    this->vscroll = (v->type == VEH_TRAIN ? this->GetScrollbar(WID_VD_SCROLLBAR) : nullptr);
    this->FinishInitNested(window_number);
 
    this->owner = v->owner;
  }

  void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
  {
    if (data == VIWD_AUTOREPLACE) {
      /* Autoreplace replaced the vehicle.
       * Nothing to do for this window. */
      return;
    }
    if (!gui_scope) return;
    const Vehicle *v = Vehicle::Get(this->window_number);
    if (v->type == VEH_ROAD) {
      const NWidgetBase *nwid_info = this->GetWidget<NWidgetBase>(WID_VD_MIDDLE_DETAILS);
      uint aimed_height = this->GetRoadVehDetailsHeight(v);
      /* If the number of articulated parts changes, the size of the window must change too. */
      if (aimed_height != nwid_info->current_y) {
        this->ReInit();
      }
    }
  }

  uint GetRoadVehDetailsHeight(const Vehicle *v)
  {
    uint desired_height;
    if (v->HasArticulatedPart()) {
      /* An articulated RV has its text drawn under the sprite instead of after it, hence 15 pixels extra. */
      desired_height = ScaleGUITrad(15) + 3 * GetCharacterHeight(FS_NORMAL) + WidgetDimensions::scaled.vsep_normal * 2;
      /* Add space for the cargo amount for each part. */
      for (const Vehicle *u = v; u != nullptr; u = u->Next()) {
        if (u->cargo_cap != 0) desired_height += GetCharacterHeight(FS_NORMAL);
      }
    } else {
      desired_height = 4 * GetCharacterHeight(FS_NORMAL) + WidgetDimensions::scaled.vsep_normal * 2;
    }
    return desired_height;
  }
 
  void UpdateWidgetSize(WidgetID widget, Dimension &size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension &fill, [[maybe_unused]] Dimension &resize) override
  {
    switch (widget) {
      case WID_VD_TOP_DETAILS: {
        Dimension dim = { 0, 0 };
        size.height = 4 * GetCharacterHeight(FS_NORMAL) + padding.height;
 
        uint64_t max_value = GetParamMaxValue(INT16_MAX);
        dim = maxdim(dim, GetStringBoundingBox(GetString(STR_VEHICLE_INFO_MAX_SPEED, max_value)));
        dim = maxdim(dim, GetStringBoundingBox(GetString(STR_VEHICLE_INFO_WEIGHT_POWER_MAX_SPEED, max_value, max_value, max_value)));
        dim = maxdim(dim, GetStringBoundingBox(GetString(STR_VEHICLE_INFO_WEIGHT_POWER_MAX_SPEED_MAX_TE, max_value, max_value, max_value, max_value)));
        dim = maxdim(dim, GetStringBoundingBox(GetString(STR_VEHICLE_INFO_PROFIT_THIS_YEAR_LAST_YEAR_MIN_PERFORMANCE, max_value, max_value, max_value)));
        dim = maxdim(dim, GetStringBoundingBox(GetString(STR_VEHICLE_INFO_PROFIT_THIS_PERIOD_LAST_PERIOD_MIN_PERFORMANCE, max_value, max_value, max_value)));
        dim = maxdim(dim, GetStringBoundingBox(GetString(STR_VEHICLE_INFO_RELIABILITY_BREAKDOWNS, max_value, max_value)));
        dim = maxdim(dim, GetStringBoundingBox(GetString(TimerGameEconomy::UsingWallclockUnits() ? STR_VEHICLE_INFO_AGE_RUNNING_COST_PERIOD : STR_VEHICLE_INFO_AGE_RUNNING_COST_YR, STR_VEHICLE_INFO_AGE, max_value, max_value, max_value)));
        size.width = dim.width + padding.width;
        break;
      }
 
      case WID_VD_MIDDLE_DETAILS: {
        const Vehicle *v = Vehicle::Get(this->window_number);
        switch (v->type) {
          case VEH_ROAD:
            size.height = this->GetRoadVehDetailsHeight(v) + padding.height;
            break;
 
          case VEH_SHIP:
            size.height = 4 * GetCharacterHeight(FS_NORMAL) + WidgetDimensions::scaled.vsep_normal * 2 + padding.height;
            break;
 
          case VEH_AIRCRAFT:
            size.height = 5 * GetCharacterHeight(FS_NORMAL) + WidgetDimensions::scaled.vsep_normal * 2 + padding.height;
            break;
 
          default:
            NOT_REACHED(); // Train uses WID_VD_MATRIX instead.
        }
        break;
      }
 
      case WID_VD_MATRIX:
        fill.height = resize.height = std::max<uint>(ScaleGUITrad(14), GetCharacterHeight(FS_NORMAL) + padding.height);
        size.height = 4 * resize.height;
        break;
 
      case WID_VD_SERVICE_INTERVAL_DROPDOWN: {
        Dimension d = maxdim(GetStringListBoundingBox(_service_interval_dropdown_calendar), GetStringListBoundingBox(_service_interval_dropdown_wallclock));
        d.width += padding.width;
        d.height += padding.height;
        size = maxdim(size, d);
        break;
      }
 
      case WID_VD_SERVICING_INTERVAL:
        /* Do we show the last serviced value as a date or minutes since service? */
        auto params = TimerGameEconomy::UsingWallclockUnits()
          ? MakeParameters(GetParamMaxValue(MAX_SERVINT_DAYS), STR_VEHICLE_DETAILS_LAST_SERVICE_MINUTES_AGO, EconomyTime::MAX_DATE)
          : MakeParameters(GetParamMaxValue(MAX_SERVINT_DAYS), STR_VEHICLE_DETAILS_LAST_SERVICE_DATE, TimerGameEconomy::DateAtStartOfYear(EconomyTime::MAX_YEAR));
 
        size.width = std::max(size.width, GetStringBoundingBox(GetStringWithArgs(STR_VEHICLE_DETAILS_SERVICING_INTERVAL_PERCENT, params)).width);
        PrepareArgsForNextRun(params);
        size.width = std::max(size.width, GetStringBoundingBox(GetStringWithArgs(STR_VEHICLE_DETAILS_SERVICING_INTERVAL_DAYS, params)).width);
 
        size.width += padding.width;
        size.height = GetCharacterHeight(FS_NORMAL) + padding.height;
        break;
    }
  }

  static bool IsVehicleServiceIntervalEnabled(const VehicleType vehicle_type, CompanyID company_id)
  {
    if (_local_company != company_id) return false;
 
    const VehicleDefaultSettings *vds = &Company::Get(company_id)->settings.vehicle;
    switch (vehicle_type) {
      default: NOT_REACHED();
      case VEH_TRAIN:    return vds->servint_trains   != 0;
      case VEH_ROAD:     return vds->servint_roadveh  != 0;
      case VEH_SHIP:     return vds->servint_ships    != 0;
      case VEH_AIRCRAFT: return vds->servint_aircraft != 0;
    }
  }

  static void DrawVehicleDetails(const Vehicle *v, const Rect &r, int vscroll_pos, uint vscroll_cap, TrainDetailsWindowTabs det_tab)
  {
    switch (v->type) {
      case VEH_TRAIN:    DrawTrainDetails(Train::From(v), r, vscroll_pos, vscroll_cap, det_tab);  break;
      case VEH_ROAD:     DrawRoadVehDetails(v, r);  break;
      case VEH_SHIP:     DrawShipDetails(v, r);     break;
      case VEH_AIRCRAFT: DrawAircraftDetails(Aircraft::From(v), r); break;
      default: NOT_REACHED();
    }
  }
 
  std::string GetWidgetString(WidgetID widget, StringID stringid) const override
  {
    if (widget == WID_VD_CAPTION) return GetString(STR_VEHICLE_DETAILS_CAPTION, Vehicle::Get(this->window_number)->index);
 
    return this->Window::GetWidgetString(widget, stringid);
  }
 
  void DrawWidget(const Rect &r, WidgetID widget) const override
  {
    const Vehicle *v = Vehicle::Get(this->window_number);
 
    switch (widget) {
      case WID_VD_TOP_DETAILS: {
        Rect tr = r.Shrink(WidgetDimensions::scaled.framerect);
 
        /* Draw running cost */
        DrawString(tr,
          GetString(TimerGameEconomy::UsingWallclockUnits() ? STR_VEHICLE_INFO_AGE_RUNNING_COST_PERIOD : STR_VEHICLE_INFO_AGE_RUNNING_COST_YR,
            (v->age + CalendarTime::DAYS_IN_YEAR < v->max_age) ? STR_VEHICLE_INFO_AGE : STR_VEHICLE_INFO_AGE_RED,
            TimerGameCalendar::DateToYear(v->age),
            TimerGameCalendar::DateToYear(v->max_age),
            v->GetDisplayRunningCost()));
        tr.top += GetCharacterHeight(FS_NORMAL);
 
        /* Draw max speed */
        uint64_t max_speed = PackVelocity(v->GetDisplayMaxSpeed(), v->type);
        if (v->type == VEH_TRAIN ||
            (v->type == VEH_ROAD && _settings_game.vehicle.roadveh_acceleration_model != AM_ORIGINAL)) {
          const GroundVehicleCache *gcache = v->GetGroundVehicleCache();
          if (v->type == VEH_TRAIN && (_settings_game.vehicle.train_acceleration_model == AM_ORIGINAL ||
              Train::From(v)->GetAccelerationType() == VehicleAccelerationModel::Maglev)) {
            DrawString(tr, GetString(STR_VEHICLE_INFO_WEIGHT_POWER_MAX_SPEED, gcache->cached_weight, gcache->cached_power, max_speed));
          } else {
            DrawString(tr, GetString(STR_VEHICLE_INFO_WEIGHT_POWER_MAX_SPEED_MAX_TE, gcache->cached_weight, gcache->cached_power, max_speed, gcache->cached_max_te));
          }
        } else if (v->type == VEH_AIRCRAFT) {
          StringID type = v->GetEngine()->GetAircraftTypeText();
          if (Aircraft::From(v)->GetRange() > 0) {
            DrawString(tr, GetString(STR_VEHICLE_INFO_MAX_SPEED_TYPE_RANGE, max_speed, type, Aircraft::From(v)->GetRange()));
          } else {
            DrawString(tr, GetString(STR_VEHICLE_INFO_MAX_SPEED_TYPE, max_speed, type));
          }
        } else {
          DrawString(tr, GetString(STR_VEHICLE_INFO_MAX_SPEED, max_speed));
        }
        tr.top += GetCharacterHeight(FS_NORMAL);
 
        /* Draw profit */
        if (v->IsGroundVehicle()) {
          DrawString(tr,
            GetString(TimerGameEconomy::UsingWallclockUnits() ? STR_VEHICLE_INFO_PROFIT_THIS_PERIOD_LAST_PERIOD_MIN_PERFORMANCE : STR_VEHICLE_INFO_PROFIT_THIS_YEAR_LAST_YEAR_MIN_PERFORMANCE,
              v->GetDisplayProfitThisYear(),
              v->GetDisplayProfitLastYear(),
              v->GetDisplayMinPowerToWeight()));
        } else {
          DrawString(tr,
            GetString(TimerGameEconomy::UsingWallclockUnits() ? STR_VEHICLE_INFO_PROFIT_THIS_PERIOD_LAST_PERIOD : STR_VEHICLE_INFO_PROFIT_THIS_YEAR_LAST_YEAR,
              v->GetDisplayProfitThisYear(),
              v->GetDisplayProfitLastYear()));
        }
        tr.top += GetCharacterHeight(FS_NORMAL);
 
        /* Draw breakdown & reliability */
        DrawString(tr, GetString(STR_VEHICLE_INFO_RELIABILITY_BREAKDOWNS, ToPercent16(v->reliability), v->breakdowns_since_last_service));
        break;
      }
 
      case WID_VD_MATRIX: {
        /* For trains only. */
        DrawVehicleDetails(v, r.Shrink(WidgetDimensions::scaled.matrix, RectPadding::zero).WithHeight(this->resize.step_height), this->vscroll->GetPosition(), this->vscroll->GetCapacity(), this->tab);
        break;
      }
 
      case WID_VD_MIDDLE_DETAILS: {
        /* For other vehicles, at the place of the matrix. */
        bool rtl = _current_text_dir == TD_RTL;
        uint sprite_width = GetSingleVehicleWidth(v, EIT_IN_DETAILS) + WidgetDimensions::scaled.framerect.Horizontal();
        Rect tr = r.Shrink(WidgetDimensions::scaled.framerect);
 
        /* Articulated road vehicles use a complete line. */
        if (v->type == VEH_ROAD && v->HasArticulatedPart()) {
          DrawVehicleImage(v, tr.WithHeight(ScaleGUITrad(GetVehicleHeight(v->type)), false), VehicleID::Invalid(), EIT_IN_DETAILS, 0);
        } else {
          Rect sr = tr.WithWidth(sprite_width, rtl);
          DrawVehicleImage(v, sr.WithHeight(ScaleGUITrad(GetVehicleHeight(v->type)), false), VehicleID::Invalid(), EIT_IN_DETAILS, 0);
        }
 
        DrawVehicleDetails(v, tr.Indent(sprite_width, rtl), 0, 0, this->tab);
        break;
      }
 
      case WID_VD_SERVICING_INTERVAL: {
        /* Draw service interval text */
        Rect tr = r.Shrink(WidgetDimensions::scaled.framerect);
 
        /* We're using wallclock units. Show minutes since last serviced. */
        if (TimerGameEconomy::UsingWallclockUnits()) {
          int minutes_since_serviced = (TimerGameEconomy::date - v->date_of_last_service).base() / EconomyTime::DAYS_IN_ECONOMY_MONTH;
          DrawString(tr.left, tr.right, CentreBounds(r.top, r.bottom, GetCharacterHeight(FS_NORMAL)),
              GetString(v->ServiceIntervalIsPercent() ? STR_VEHICLE_DETAILS_SERVICING_INTERVAL_PERCENT : STR_VEHICLE_DETAILS_SERVICING_INTERVAL_MINUTES,
                  v->GetServiceInterval(), STR_VEHICLE_DETAILS_LAST_SERVICE_MINUTES_AGO, minutes_since_serviced));
          break;
        }
 
        /* We're using calendar dates. Show the date of last service. */
        DrawString(tr.left, tr.right, CentreBounds(r.top, r.bottom, GetCharacterHeight(FS_NORMAL)),
            GetString(v->ServiceIntervalIsPercent() ? STR_VEHICLE_DETAILS_SERVICING_INTERVAL_PERCENT : STR_VEHICLE_DETAILS_SERVICING_INTERVAL_DAYS,
                v->GetServiceInterval(), STR_VEHICLE_DETAILS_LAST_SERVICE_DATE, v->date_of_last_service));
        break;
      }
    }
  }

  void OnPaint() override
  {
    const Vehicle *v = Vehicle::Get(this->window_number);
 
    if (v->type == VEH_TRAIN) {
      this->LowerWidget(WID_VD_DETAILS_CARGO_CARRIED + this->tab);
      this->vscroll->SetCount(GetTrainDetailsWndVScroll(v->index, this->tab));
    }
 
    /* Disable service-scroller when interval is set to disabled */
    this->SetWidgetsDisabledState(!IsVehicleServiceIntervalEnabled(v->type, v->owner),
      WID_VD_INCREASE_SERVICING_INTERVAL,
      WID_VD_DECREASE_SERVICING_INTERVAL);
 
    StringID str =
      !v->ServiceIntervalIsCustom() ? STR_VEHICLE_DETAILS_DEFAULT :
      v->ServiceIntervalIsPercent() ? STR_VEHICLE_DETAILS_PERCENT :
      TimerGameEconomy::UsingWallclockUnits() ? STR_VEHICLE_DETAILS_MINUTES : STR_VEHICLE_DETAILS_DAYS;
    this->GetWidget<NWidgetCore>(WID_VD_SERVICE_INTERVAL_DROPDOWN)->SetString(str);
    this->SetWidgetDisabledState(WID_VD_SERVICE_INTERVAL_DROPDOWN, v->owner != _local_company);
 
    this->DrawWidgets();
  }
 
  void OnClick([[maybe_unused]] Point pt, WidgetID widget, [[maybe_unused]] int click_count) override
  {
    switch (widget) {
      case WID_VD_INCREASE_SERVICING_INTERVAL:   // increase int
      case WID_VD_DECREASE_SERVICING_INTERVAL: { // decrease int
        const Vehicle *v = Vehicle::Get(this->window_number);
        int mod;
        if (!v->ServiceIntervalIsPercent() && TimerGameEconomy::UsingWallclockUnits()) {
          mod = _ctrl_pressed ? 1 : 5;
        } else {
          mod = _ctrl_pressed ? 5 : 10;
        }
 
        mod = (widget == WID_VD_DECREASE_SERVICING_INTERVAL) ? -mod : mod;
        mod = GetServiceIntervalClamped(mod + v->GetServiceInterval(), v->ServiceIntervalIsPercent());
        if (mod == v->GetServiceInterval()) return;
 
        Command<Commands::ChangeServiceInterval>::Post(STR_ERROR_CAN_T_CHANGE_SERVICING, v->index, mod, true, v->ServiceIntervalIsPercent());
        break;
      }
 
      case WID_VD_SERVICE_INTERVAL_DROPDOWN: {
        const Vehicle *v = Vehicle::Get(this->window_number);
        ShowDropDownMenu(this,
          TimerGameEconomy::UsingWallclockUnits() ? _service_interval_dropdown_wallclock : _service_interval_dropdown_calendar,
          v->ServiceIntervalIsCustom() ? (v->ServiceIntervalIsPercent() ? 2 : 1) : 0, widget, 0, 0);
        break;
      }
 
      case WID_VD_DETAILS_CARGO_CARRIED:
      case WID_VD_DETAILS_TRAIN_VEHICLES:
      case WID_VD_DETAILS_CAPACITY_OF_EACH:
      case WID_VD_DETAILS_TOTAL_CARGO:
        this->SetWidgetsLoweredState(false,
          WID_VD_DETAILS_CARGO_CARRIED,
          WID_VD_DETAILS_TRAIN_VEHICLES,
          WID_VD_DETAILS_CAPACITY_OF_EACH,
          WID_VD_DETAILS_TOTAL_CARGO);
 
        this->tab = (TrainDetailsWindowTabs)(widget - WID_VD_DETAILS_CARGO_CARRIED);
        this->SetDirty();
        break;
    }
  }
 
  bool OnTooltip([[maybe_unused]] Point pt, WidgetID widget, TooltipCloseCondition close_cond) override
  {
    if (widget == WID_VD_INCREASE_SERVICING_INTERVAL || widget == WID_VD_DECREASE_SERVICING_INTERVAL) {
      const Vehicle *v = Vehicle::Get(this->window_number);
      StringID tool_tip;
      if (v->ServiceIntervalIsPercent()) {
        tool_tip = widget == WID_VD_INCREASE_SERVICING_INTERVAL ? STR_VEHICLE_DETAILS_INCREASE_SERVICING_INTERVAL_TOOLTIP_PERCENT : STR_VEHICLE_DETAILS_DECREASE_SERVICING_INTERVAL_TOOLTIP_PERCENT;
      } else if (TimerGameEconomy::UsingWallclockUnits()) {
        tool_tip = widget == WID_VD_INCREASE_SERVICING_INTERVAL ? STR_VEHICLE_DETAILS_INCREASE_SERVICING_INTERVAL_TOOLTIP_MINUTES : STR_VEHICLE_DETAILS_DECREASE_SERVICING_INTERVAL_TOOLTIP_MINUTES;
      } else {
        tool_tip = widget == WID_VD_INCREASE_SERVICING_INTERVAL ? STR_VEHICLE_DETAILS_INCREASE_SERVICING_INTERVAL_TOOLTIP_DAYS : STR_VEHICLE_DETAILS_DECREASE_SERVICING_INTERVAL_TOOLTIP_DAYS;
      }
      GuiShowTooltips(this, GetEncodedString(tool_tip), close_cond);
      return true;
    }
 
    return false;
  }
 
  void OnDropdownSelect(WidgetID widget, int index, int) override
  {
    switch (widget) {
      case WID_VD_SERVICE_INTERVAL_DROPDOWN: {
        const Vehicle *v = Vehicle::Get(this->window_number);
        bool iscustom = index != 0;
        bool ispercent = iscustom ? (index == 2) : Company::Get(v->owner)->settings.vehicle.servint_ispercent;
        uint16_t interval = GetServiceIntervalClamped(v->GetServiceInterval(), ispercent);
        Command<Commands::ChangeServiceInterval>::Post(STR_ERROR_CAN_T_CHANGE_SERVICING, v->index, interval, iscustom, ispercent);
        break;
      }
    }
  }
 
  void OnResize() override
  {
    NWidgetCore *nwi = this->GetWidget<NWidgetCore>(WID_VD_MATRIX);
    if (nwi != nullptr) {
      this->vscroll->SetCapacityFromWidget(this, WID_VD_MATRIX);
    }
  }
};

static WindowDesc _train_vehicle_details_desc(
  WDP_AUTO, "view_vehicle_details_train", 405, 178,
  WC_VEHICLE_DETAILS, WC_VEHICLE_VIEW,
  {},
  _nested_train_vehicle_details_widgets
);

static WindowDesc _nontrain_vehicle_details_desc(
  WDP_AUTO, "view_vehicle_details", 405, 113,
  WC_VEHICLE_DETAILS, WC_VEHICLE_VIEW,
  {},
  _nested_nontrain_vehicle_details_widgets
);

static void ShowVehicleDetailsWindow(const Vehicle *v)
{
  CloseWindowById(WC_VEHICLE_ORDERS, v->index, false);
  CloseWindowById(WC_VEHICLE_TIMETABLE, v->index, false);
  AllocateWindowDescFront<VehicleDetailsWindow>((v->type == VEH_TRAIN) ? _train_vehicle_details_desc : _nontrain_vehicle_details_desc, v->index);
}
 
 
/* Unified vehicle GUI - Vehicle View Window */

static constexpr std::initializer_list<NWidgetPart> _nested_vehicle_view_widgets = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_GREY),
    NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_VV_RENAME), SetAspect(WidgetDimensions::ASPECT_RENAME), SetSpriteTip(SPR_RENAME),
    NWidget(WWT_CAPTION, COLOUR_GREY, WID_VV_CAPTION),
    NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_VV_LOCATION), SetAspect(WidgetDimensions::ASPECT_LOCATION), SetSpriteTip(SPR_GOTO_LOCATION),
    NWidget(WWT_DEBUGBOX, COLOUR_GREY),
    NWidget(WWT_SHADEBOX, COLOUR_GREY),
    NWidget(WWT_DEFSIZEBOX, COLOUR_GREY),
    NWidget(WWT_STICKYBOX, COLOUR_GREY),
  EndContainer(),
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_PANEL, COLOUR_GREY),
      NWidget(WWT_INSET, COLOUR_GREY), SetPadding(2, 2, 2, 2),
        NWidget(NWID_VIEWPORT, INVALID_COLOUR, WID_VV_VIEWPORT), SetMinimalSize(226, 84), SetResize(1, 1),
      EndContainer(),
    EndContainer(),
    NWidget(NWID_VERTICAL),
      NWidget(NWID_SELECTION, INVALID_COLOUR, WID_VV_SELECT_DEPOT_CLONE),
        NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_VV_GOTO_DEPOT), SetMinimalSize(18, 18), SetSpriteTip(SPR_EMPTY /* filled later */),
        NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_VV_CLONE), SetMinimalSize(18, 18), SetSpriteTip(SPR_EMPTY /* filled later */),
      EndContainer(),
      /* For trains only, 'ignore signal' button. */
      NWidget(NWID_SELECTION, INVALID_COLOUR, WID_VV_FORCE_PROCEED_SEL),
        NWidget(WWT_IMGBTN, COLOUR_GREY, WID_VV_FORCE_PROCEED), SetMinimalSize(18, 18),
                      SetSpriteTip(SPR_IGNORE_SIGNALS, STR_VEHICLE_VIEW_TRAIN_IGNORE_SIGNAL_TOOLTIP),
      EndContainer(),
      NWidget(NWID_SELECTION, INVALID_COLOUR, WID_VV_SELECT_REFIT_TURN),
        NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_VV_REFIT), SetMinimalSize(18, 18), SetSpriteTip(SPR_REFIT_VEHICLE),
        NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_VV_TURN_AROUND), SetMinimalSize(18, 18),
                        SetSpriteTip(SPR_FORCE_VEHICLE_TURN, STR_VEHICLE_VIEW_ROAD_VEHICLE_REVERSE_TOOLTIP),
      EndContainer(),
      NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_VV_SHOW_ORDERS), SetMinimalSize(18, 18), SetSpriteTip(SPR_SHOW_ORDERS),
      NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_VV_SHOW_DETAILS), SetMinimalSize(18, 18), SetSpriteTip(SPR_SHOW_VEHICLE_DETAILS),
      NWidget(WWT_PANEL, COLOUR_GREY), SetMinimalSize(18, 0), SetResize(0, 1), EndContainer(),
    EndContainer(),
  EndContainer(),
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_PUSHBTN, COLOUR_GREY, WID_VV_START_STOP), SetResize(1, 0), SetFill(1, 0),
    NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_VV_ORDER_LOCATION), SetAspect(WidgetDimensions::ASPECT_LOCATION), SetSpriteTip(SPR_GOTO_LOCATION, STR_VEHICLE_VIEW_ORDER_LOCATION_TOOLTIP),
    NWidget(WWT_RESIZEBOX, COLOUR_GREY),
  EndContainer(),
};
 
/* Just to make sure, nobody has changed the vehicle type constants, as we are
   using them for array indexing in a number of places here. */
static_assert(VEH_TRAIN == 0);
static_assert(VEH_ROAD == 1);
static_assert(VEH_SHIP == 2);
static_assert(VEH_AIRCRAFT == 3);

static const ZoomLevel _vehicle_view_zoom_levels[] = {
  ZoomLevel::Train,
  ZoomLevel::RoadVehicle,
  ZoomLevel::Ship,
  ZoomLevel::Aircraft,
};
 
/* Constants for geometry of vehicle view viewport */
static const int VV_INITIAL_VIEWPORT_WIDTH = 226;
static const int VV_INITIAL_VIEWPORT_HEIGHT = 84;
static const int VV_INITIAL_VIEWPORT_HEIGHT_TRAIN = 102;

enum VehicleCommandTranslation : uint8_t {
  VCT_CMD_START_STOP = 0,
  VCT_CMD_CLONE_VEH,
  VCT_CMD_TURN_AROUND,
};

static const StringID _vehicle_msg_translation_table[][4] = {
  { // VCT_CMD_START_STOP
    STR_ERROR_CAN_T_STOP_START_TRAIN,
    STR_ERROR_CAN_T_STOP_START_ROAD_VEHICLE,
    STR_ERROR_CAN_T_STOP_START_SHIP,
    STR_ERROR_CAN_T_STOP_START_AIRCRAFT
  },
  { // VCT_CMD_CLONE_VEH
    STR_ERROR_CAN_T_BUY_TRAIN,
    STR_ERROR_CAN_T_BUY_ROAD_VEHICLE,
    STR_ERROR_CAN_T_BUY_SHIP,
    STR_ERROR_CAN_T_BUY_AIRCRAFT
  },
  { // VCT_CMD_TURN_AROUND
    STR_ERROR_CAN_T_REVERSE_DIRECTION_TRAIN,
    STR_ERROR_CAN_T_MAKE_ROAD_VEHICLE_TURN,
    INVALID_STRING_ID, // invalid for ships
    INVALID_STRING_ID  // invalid for aircraft
  },
};

void CcStartStopVehicle(Commands, const CommandCost &result, VehicleID veh_id, bool)
{
  if (result.Failed()) return;
 
  const Vehicle *v = Vehicle::GetIfValid(veh_id);
  if (v == nullptr || !v->IsPrimaryVehicle() || v->owner != _local_company) return;
 
  StringID msg = v->vehstatus.Test(VehState::Stopped) ? STR_VEHICLE_COMMAND_STOPPED : STR_VEHICLE_COMMAND_STARTED;
  Point pt = RemapCoords(v->x_pos, v->y_pos, v->z_pos);
  AddTextEffect(GetEncodedString(msg), pt.x, pt.y, Ticks::DAY_TICKS, TE_RISING);
}

void StartStopVehicle(const Vehicle *v, bool texteffect)
{
  assert(v->IsPrimaryVehicle());
  Command<Commands::StartStopVehicle>::Post(_vehicle_msg_translation_table[VCT_CMD_START_STOP][v->type], texteffect ? CcStartStopVehicle : nullptr, v->tile, v->index, false);
}

static bool IsVehicleRefittable(const Vehicle *v)
{
  if (!v->IsStoppedInDepot()) return false;
 
  do {
    if (IsEngineRefittable(v->engine_type)) return true;
  } while (v->IsGroundVehicle() && (v = v->Next()) != nullptr);
 
  return false;
}

struct VehicleViewWindow : Window {
private:
  enum PlaneSelections : uint8_t {
    SEL_DC_GOTO_DEPOT,  
    SEL_DC_CLONE,       
 
    SEL_RT_REFIT,       
    SEL_RT_TURN_AROUND, 
 
    SEL_DC_BASEPLANE = SEL_DC_GOTO_DEPOT, 
    SEL_RT_BASEPLANE = SEL_RT_REFIT,      
  };
  bool mouse_over_start_stop = false;

  void SelectPlane(PlaneSelections plane)
  {
    switch (plane) {
      case SEL_DC_GOTO_DEPOT:
      case SEL_DC_CLONE:
        this->GetWidget<NWidgetStacked>(WID_VV_SELECT_DEPOT_CLONE)->SetDisplayedPlane(plane - SEL_DC_BASEPLANE);
        break;
 
      case SEL_RT_REFIT:
      case SEL_RT_TURN_AROUND:
        this->GetWidget<NWidgetStacked>(WID_VV_SELECT_REFIT_TURN)->SetDisplayedPlane(plane - SEL_RT_BASEPLANE);
        break;
 
      default:
        NOT_REACHED();
    }
  }
 
public:
  VehicleViewWindow(WindowDesc &desc, WindowNumber window_number) : Window(desc)
  {
    this->flags.Set(WindowFlag::DisableVpScroll);
    this->CreateNestedTree();
 
    /* Sprites for the 'send to depot' button indexed by vehicle type. */
    static const SpriteID vehicle_view_goto_depot_sprites[] = {
      SPR_SEND_TRAIN_TODEPOT,
      SPR_SEND_ROADVEH_TODEPOT,
      SPR_SEND_SHIP_TODEPOT,
      SPR_SEND_AIRCRAFT_TODEPOT,
    };
    const Vehicle *v = Vehicle::Get(window_number);
    this->GetWidget<NWidgetCore>(WID_VV_GOTO_DEPOT)->SetSprite(vehicle_view_goto_depot_sprites[v->type]);
 
    /* Sprites for the 'clone vehicle' button indexed by vehicle type. */
    static const SpriteID vehicle_view_clone_sprites[] = {
      SPR_CLONE_TRAIN,
      SPR_CLONE_ROADVEH,
      SPR_CLONE_SHIP,
      SPR_CLONE_AIRCRAFT,
    };
    this->GetWidget<NWidgetCore>(WID_VV_CLONE)->SetSprite(vehicle_view_clone_sprites[v->type]);
 
    switch (v->type) {
      case VEH_TRAIN:
        this->GetWidget<NWidgetCore>(WID_VV_TURN_AROUND)->SetToolTip(STR_VEHICLE_VIEW_TRAIN_REVERSE_TOOLTIP);
        this->GetWidget<NWidgetStacked>(WID_VV_FORCE_PROCEED_SEL)->SetDisplayedPlane(0);
        break;
 
      case VEH_ROAD:
        this->GetWidget<NWidgetStacked>(WID_VV_FORCE_PROCEED_SEL)->SetDisplayedPlane(SZSP_NONE);
        break;
 
      case VEH_SHIP:
      case VEH_AIRCRAFT:
        this->GetWidget<NWidgetStacked>(WID_VV_FORCE_PROCEED_SEL)->SetDisplayedPlane(SZSP_NONE);
        this->SelectPlane(SEL_RT_REFIT);
        break;
 
      default: NOT_REACHED();
    }
    this->FinishInitNested(window_number);
    this->owner = v->owner;
    this->GetWidget<NWidgetViewport>(WID_VV_VIEWPORT)->InitializeViewport(this, static_cast<VehicleID>(this->window_number), ScaleZoomGUI(_vehicle_view_zoom_levels[v->type]));
 
    this->GetWidget<NWidgetCore>(WID_VV_START_STOP)->SetToolTip(STR_VEHICLE_VIEW_TRAIN_STATUS_START_STOP_TOOLTIP + v->type);
    this->GetWidget<NWidgetCore>(WID_VV_RENAME)->SetToolTip(STR_VEHICLE_DETAILS_TRAIN_RENAME + v->type);
    this->GetWidget<NWidgetCore>(WID_VV_LOCATION)->SetToolTip(STR_VEHICLE_VIEW_TRAIN_CENTER_TOOLTIP + v->type);
    this->GetWidget<NWidgetCore>(WID_VV_REFIT)->SetToolTip(STR_VEHICLE_VIEW_TRAIN_REFIT_TOOLTIP + v->type);
    this->GetWidget<NWidgetCore>(WID_VV_GOTO_DEPOT)->SetToolTip(STR_VEHICLE_VIEW_TRAIN_SEND_TO_DEPOT_TOOLTIP + v->type);
    this->GetWidget<NWidgetCore>(WID_VV_SHOW_ORDERS)->SetToolTip(STR_VEHICLE_VIEW_TRAIN_ORDERS_TOOLTIP + v->type);
    this->GetWidget<NWidgetCore>(WID_VV_SHOW_DETAILS)->SetToolTip(STR_VEHICLE_VIEW_TRAIN_SHOW_DETAILS_TOOLTIP + v->type);
    this->GetWidget<NWidgetCore>(WID_VV_CLONE)->SetToolTip(STR_VEHICLE_VIEW_CLONE_TRAIN_INFO + v->type);
 
    this->UpdatePlanes();
    this->UpdateButtons();
  }
 
  void Close([[maybe_unused]] int data = 0) override
  {
    CloseWindowById(WC_VEHICLE_ORDERS, this->window_number, false);
    CloseWindowById(WC_VEHICLE_REFIT, this->window_number, false);
    CloseWindowById(WC_VEHICLE_DETAILS, this->window_number, false);
    CloseWindowById(WC_VEHICLE_TIMETABLE, this->window_number, false);
    this->Window::Close();
  }
 
  void UpdateWidgetSize(WidgetID widget, Dimension &size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension &fill, [[maybe_unused]] Dimension &resize) override
  {
    const Vehicle *v = Vehicle::Get(this->window_number);
    switch (widget) {
      case WID_VV_START_STOP:
        size.height = std::max<uint>({size.height, (uint)GetCharacterHeight(FS_NORMAL), GetScaledSpriteSize(SPR_WARNING_SIGN).height, GetScaledSpriteSize(SPR_FLAG_VEH_STOPPED).height, GetScaledSpriteSize(SPR_FLAG_VEH_RUNNING).height}) + padding.height;
        break;
 
      case WID_VV_FORCE_PROCEED:
        if (v->type != VEH_TRAIN) {
          size.height = 0;
          size.width = 0;
        }
        break;
 
      case WID_VV_VIEWPORT:
        size.width = VV_INITIAL_VIEWPORT_WIDTH;
        size.height = (v->type == VEH_TRAIN) ? VV_INITIAL_VIEWPORT_HEIGHT_TRAIN : VV_INITIAL_VIEWPORT_HEIGHT;
        break;
    }
  }

  void UpdateButtons()
  {
    const Vehicle *v = Vehicle::Get(this->window_number);
    bool is_localcompany = v->owner == _local_company;
    bool refittable_and_stopped_in_depot = IsVehicleRefittable(v);
 
    this->SetWidgetDisabledState(WID_VV_RENAME, !is_localcompany);
    this->SetWidgetDisabledState(WID_VV_GOTO_DEPOT, !is_localcompany);
    this->SetWidgetDisabledState(WID_VV_REFIT, !refittable_and_stopped_in_depot || !is_localcompany);
    this->SetWidgetDisabledState(WID_VV_CLONE, !is_localcompany);
 
    if (v->type == VEH_TRAIN) {
      this->SetWidgetLoweredState(WID_VV_FORCE_PROCEED, Train::From(v)->force_proceed == TFP_SIGNAL);
      this->SetWidgetDisabledState(WID_VV_FORCE_PROCEED, !is_localcompany);
    }
 
    if (v->type == VEH_TRAIN || v->type == VEH_ROAD) {
      this->SetWidgetDisabledState(WID_VV_TURN_AROUND, !is_localcompany);
    }
 
    this->SetWidgetDisabledState(WID_VV_ORDER_LOCATION, v->current_order.GetLocation(v) == INVALID_TILE);
  }
 
  void OnPaint() override
  {
    const Vehicle *v = Vehicle::Get(this->window_number);
 
    const Window *mainwindow = GetMainWindow();
    if (mainwindow->viewport->follow_vehicle == v->index) {
      this->LowerWidget(WID_VV_LOCATION);
    }
 
    this->DrawWidgets();
  }
 
  std::string GetWidgetString(WidgetID widget, StringID stringid) const override
  {
    if (widget != WID_VV_CAPTION) return this->Window::GetWidgetString(widget, stringid);
 
    const Vehicle *v = Vehicle::Get(this->window_number);
    return GetString(STR_VEHICLE_VIEW_CAPTION, v->index);
  }
 
  std::string GetVehicleStatusString(const Vehicle *v, TextColour &text_colour) const
  {
    text_colour = TC_BLACK;
 
    if (v->vehstatus.Test(VehState::Crashed)) return GetString(STR_VEHICLE_STATUS_CRASHED);
 
    if (v->type != VEH_AIRCRAFT && v->breakdown_ctr == 1) return GetString(STR_VEHICLE_STATUS_BROKEN_DOWN);
 
    if (v->vehstatus.Test(VehState::Stopped) && (!mouse_over_start_stop || v->IsStoppedInDepot())) {
      if (v->type != VEH_TRAIN) return GetString(STR_VEHICLE_STATUS_STOPPED);
      if (v->cur_speed != 0) return GetString(STR_VEHICLE_STATUS_TRAIN_STOPPING_VEL, PackVelocity(v->GetDisplaySpeed(), v->type));
      if (Train::From(v)->gcache.cached_power == 0) return GetString(STR_VEHICLE_STATUS_TRAIN_NO_POWER);
      return GetString(STR_VEHICLE_STATUS_STOPPED);
    }
 
    if (v->IsInDepot() && v->IsWaitingForUnbunching()) return GetString(STR_VEHICLE_STATUS_WAITING_UNBUNCHING);
 
    if (v->type == VEH_TRAIN && Train::From(v)->flags.Test(VehicleRailFlag::Stuck) && !v->current_order.IsType(OT_LOADING)) return GetString(STR_VEHICLE_STATUS_TRAIN_STUCK);
 
    if (v->type == VEH_AIRCRAFT && Aircraft::From(v)->flags.Test(VehicleAirFlag::DestinationTooFar) && !v->current_order.IsType(OT_LOADING)) return GetString(STR_VEHICLE_STATUS_AIRCRAFT_TOO_FAR);
 
    /* Vehicle is in a "normal" state, show current order. */
    if (mouse_over_start_stop) {
      if (v->vehstatus.Test(VehState::Stopped)) {
        text_colour = TC_RED | TC_FORCED;
      } else if (v->type == VEH_TRAIN && Train::From(v)->flags.Test(VehicleRailFlag::Stuck) && !v->current_order.IsType(OT_LOADING)) {
        text_colour = TC_ORANGE | TC_FORCED;
      }
    }
 
    switch (v->current_order.GetType()) {
      case OT_GOTO_STATION:
        return GetString(v->vehicle_flags.Test(VehicleFlag::PathfinderLost) ? STR_VEHICLE_STATUS_CANNOT_REACH_STATION_VEL : STR_VEHICLE_STATUS_HEADING_FOR_STATION_VEL,
          v->current_order.GetDestination(), PackVelocity(v->GetDisplaySpeed(), v->type));
 
      case OT_GOTO_DEPOT: {
        /* This case *only* happens when multiple nearest depot orders
         * follow each other (including an order list only one order: a
         * nearest depot order) and there are no reachable depots.
         * It is primarily to guard for the case that there is no
         * depot with index 0, which would be used as fallback for
         * evaluating the string in the status bar. */
        if (v->current_order.GetDestination() == DepotID::Invalid()) return {};
 
        auto params = MakeParameters(v->type, v->current_order.GetDestination(), PackVelocity(v->GetDisplaySpeed(), v->type));
        if (v->current_order.GetDepotActionType().Test(OrderDepotActionFlag::Halt)) {
          return GetStringWithArgs(v->vehicle_flags.Test(VehicleFlag::PathfinderLost) ? STR_VEHICLE_STATUS_CANNOT_REACH_DEPOT_VEL : STR_VEHICLE_STATUS_HEADING_FOR_DEPOT_VEL, params);
        }
 
        if (v->current_order.GetDepotActionType().Test(OrderDepotActionFlag::Unbunch)) {
          return GetStringWithArgs(v->vehicle_flags.Test(VehicleFlag::PathfinderLost) ? STR_VEHICLE_STATUS_CANNOT_REACH_DEPOT_SERVICE_VEL : STR_VEHICLE_STATUS_HEADING_FOR_DEPOT_UNBUNCH_VEL, params);
        }
 
        return GetStringWithArgs(v->vehicle_flags.Test(VehicleFlag::PathfinderLost) ? STR_VEHICLE_STATUS_CANNOT_REACH_DEPOT_SERVICE_VEL : STR_VEHICLE_STATUS_HEADING_FOR_DEPOT_SERVICE_VEL, params);
      }
 
      case OT_LOADING:
        return GetString(STR_VEHICLE_STATUS_LOADING_UNLOADING);
 
      case OT_GOTO_WAYPOINT:
        assert(v->type == VEH_TRAIN || v->type == VEH_ROAD || v->type == VEH_SHIP);
        return GetString(v->vehicle_flags.Test(VehicleFlag::PathfinderLost) ? STR_VEHICLE_STATUS_CANNOT_REACH_WAYPOINT_VEL : STR_VEHICLE_STATUS_HEADING_FOR_WAYPOINT_VEL,
          v->current_order.GetDestination(),PackVelocity(v->GetDisplaySpeed(), v->type));
 
      case OT_LEAVESTATION:
        if (v->type != VEH_AIRCRAFT) {
          return GetString(STR_VEHICLE_STATUS_LEAVING);
        }
        [[fallthrough]];
 
      default:
        if (v->GetNumManualOrders() == 0) {
          return GetString(STR_VEHICLE_STATUS_NO_ORDERS_VEL, PackVelocity(v->GetDisplaySpeed(), v->type));
        }
 
        return {};
    }
  }
 
  void DrawWidget(const Rect &r, WidgetID widget) const override
  {
    if (widget != WID_VV_START_STOP) return;
 
    /* Draw the flag plus orders. */
    bool rtl = (_current_text_dir == TD_RTL);
    uint icon_width = std::max({GetScaledSpriteSize(SPR_WARNING_SIGN).width, GetScaledSpriteSize(SPR_FLAG_VEH_STOPPED).width, GetScaledSpriteSize(SPR_FLAG_VEH_RUNNING).width});
    Rect tr = r.Shrink(WidgetDimensions::scaled.framerect);
 
    const Vehicle *v = Vehicle::Get(this->window_number);
    SpriteID image = v->vehstatus.Test(VehState::Stopped) ? SPR_FLAG_VEH_STOPPED : (v->vehicle_flags.Test(VehicleFlag::PathfinderLost)) ? SPR_WARNING_SIGN : SPR_FLAG_VEH_RUNNING;
    DrawSpriteIgnorePadding(image, PAL_NONE, tr.WithWidth(icon_width, rtl), SA_CENTER);
 
    tr = tr.Indent(icon_width + WidgetDimensions::scaled.imgbtn.Horizontal(), rtl);
 
    TextColour text_colour = TC_FROMSTRING;
    std::string str = GetVehicleStatusString(v, text_colour);
    DrawString(tr.left, tr.right, CentreBounds(tr.top, tr.bottom, GetCharacterHeight(FS_NORMAL)), str, text_colour, SA_HOR_CENTER);
  }
 
  void OnClick([[maybe_unused]] Point pt, WidgetID widget, [[maybe_unused]] int click_count) override
  {
    const Vehicle *v = Vehicle::Get(this->window_number);
 
    switch (widget) {
      case WID_VV_RENAME: { // rename
        ShowQueryString(GetString(STR_VEHICLE_NAME, v->index), STR_QUERY_RENAME_TRAIN_CAPTION + v->type,
            MAX_LENGTH_VEHICLE_NAME_CHARS, this, CS_ALPHANUMERAL, {QueryStringFlag::EnableDefault, QueryStringFlag::LengthIsInChars});
        break;
      }
 
      case WID_VV_START_STOP: // start stop
        StartStopVehicle(v, false);
        break;
 
      case WID_VV_ORDER_LOCATION: {
        /* Scroll to current order destination */
        TileIndex tile = v->current_order.GetLocation(v);
        if (tile == INVALID_TILE) break;
 
        if (_ctrl_pressed) {
          ShowExtraViewportWindow(tile);
        } else {
          ScrollMainWindowToTile(tile);
        }
        break;
      }
 
      case WID_VV_LOCATION: // center main view
        if (_ctrl_pressed) {
          ShowExtraViewportWindow(TileVirtXY(v->x_pos, v->y_pos));
        } else {
          const Window *mainwindow = GetMainWindow();
          if (click_count > 1) {
            /* main window 'follows' vehicle */
            mainwindow->viewport->follow_vehicle = v->index;
          } else {
            if (mainwindow->viewport->follow_vehicle == v->index) mainwindow->viewport->follow_vehicle = VehicleID::Invalid();
            ScrollMainWindowTo(v->x_pos, v->y_pos, v->z_pos);
          }
        }
        break;
 
      case WID_VV_GOTO_DEPOT: // goto hangar
        Command<Commands::SendVehicleToDepot>::Post(GetCmdSendToDepotMsg(v), v->index, _ctrl_pressed ? DepotCommandFlag::Service : DepotCommandFlags{}, {});
        break;
      case WID_VV_REFIT: // refit
        ShowVehicleRefitWindow(v, INVALID_VEH_ORDER_ID, this);
        break;
      case WID_VV_SHOW_ORDERS: // show orders
        if (_ctrl_pressed) {
          ShowTimetableWindow(v);
        } else {
          ShowOrdersWindow(v);
        }
        break;
      case WID_VV_SHOW_DETAILS: // show details
        if (_ctrl_pressed) {
          ShowCompanyGroupForVehicle(v);
        } else {
          ShowVehicleDetailsWindow(v);
        }
        break;
      case WID_VV_CLONE: // clone vehicle
        /* Suppress the vehicle GUI when share-cloning.
         * There is no point to it except for starting the vehicle.
         * For starting the vehicle the player has to open the depot GUI, which is
         * most likely already open, but is also visible in the vehicle viewport. */
        Command<Commands::CloneVehicle>::Post(_vehicle_msg_translation_table[VCT_CMD_CLONE_VEH][v->type],
                    _ctrl_pressed ? nullptr : CcCloneVehicle,
                    v->tile, v->index, _ctrl_pressed);
        break;
      case WID_VV_TURN_AROUND: // turn around
        assert(v->IsGroundVehicle());
        if (v->type == VEH_ROAD) {
          Command<Commands::TurnRoadVehicle>::Post(_vehicle_msg_translation_table[VCT_CMD_TURN_AROUND][v->type], v->tile, v->index);
        } else {
          Command<Commands::ReverseTrainDirection>::Post(_vehicle_msg_translation_table[VCT_CMD_TURN_AROUND][v->type], v->tile, v->index, false);
        }
        break;
      case WID_VV_FORCE_PROCEED: // force proceed
        assert(v->type == VEH_TRAIN);
        Command<Commands::ForceTrainProceed>::Post(STR_ERROR_CAN_T_MAKE_TRAIN_PASS_SIGNAL, v->tile, v->index);
        break;
    }
  }
 
  EventState OnHotkey(int hotkey) override
  {
    /* If the hotkey is not for any widget in the UI (i.e. for honking) */
    if (hotkey == WID_VV_HONK_HORN) {
      const Window *mainwindow = GetMainWindow();
      const Vehicle *v = Vehicle::Get(window_number);
      /* Only play the sound if we're following this vehicle */
      if (mainwindow->viewport->follow_vehicle == v->index) {
        v->PlayLeaveStationSound(true);
      }
    }
    return Window::OnHotkey(hotkey);
  }
 
  void OnQueryTextFinished(std::optional<std::string> str) override
  {
    if (!str.has_value()) return;
 
    Command<Commands::RenameVehicle>::Post(STR_ERROR_CAN_T_RENAME_TRAIN + Vehicle::Get(this->window_number)->type, static_cast<VehicleID>(this->window_number), *str);
  }
 
  void OnMouseOver([[maybe_unused]] Point pt, WidgetID widget) override
  {
    bool start_stop = widget == WID_VV_START_STOP;
    if (start_stop != mouse_over_start_stop) {
      mouse_over_start_stop = start_stop;
      this->SetWidgetDirty(WID_VV_START_STOP);
    }
  }
 
  void OnMouseWheel(int wheel, WidgetID widget) override
  {
    if (widget != WID_VV_VIEWPORT) return;
    if (_settings_client.gui.scrollwheel_scrolling != ScrollWheelScrolling::Off) {
      DoZoomInOutWindow(wheel < 0 ? ZOOM_IN : ZOOM_OUT, this);
    }
  }
 
  void OnResize() override
  {
    if (this->viewport != nullptr) {
      NWidgetViewport *nvp = this->GetWidget<NWidgetViewport>(WID_VV_VIEWPORT);
      nvp->UpdateViewportCoordinates(this);
    }
  }

  void UpdatePlanes()
  {
    const Vehicle *v = Vehicle::Get(this->window_number);
    bool veh_stopped = v->IsStoppedInDepot();
 
    /* Widget WID_VV_GOTO_DEPOT must be hidden if the vehicle is already stopped in depot.
     * Widget WID_VV_CLONE_VEH should then be shown, since cloning is allowed only while in depot and stopped.
     */
    PlaneSelections plane = veh_stopped ? SEL_DC_CLONE : SEL_DC_GOTO_DEPOT;
    NWidgetStacked *nwi = this->GetWidget<NWidgetStacked>(WID_VV_SELECT_DEPOT_CLONE); // Selection widget 'send to depot' / 'clone'.
    if (nwi->shown_plane + SEL_DC_BASEPLANE != plane) {
      this->SelectPlane(plane);
    }
    /* The same system applies to widget WID_VV_REFIT_VEH and VVW_WIDGET_TURN_AROUND.*/
    if (v->IsGroundVehicle()) {
      plane = veh_stopped ? SEL_RT_REFIT : SEL_RT_TURN_AROUND;
      nwi = this->GetWidget<NWidgetStacked>(WID_VV_SELECT_REFIT_TURN);
      if (nwi->shown_plane + SEL_RT_BASEPLANE != plane) {
        this->SelectPlane(plane);
      }
    }
  }

  void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
  {
    if (data == VIWD_AUTOREPLACE) {
      /* Autoreplace replaced the vehicle.
       * Nothing to do for this window. */
      return;
    }
 
    this->UpdatePlanes();
    this->UpdateButtons();
    this->SetDirty();
  }
 
  bool IsNewGRFInspectable() const override
  {
    return ::IsNewGRFInspectable(GetGrfSpecFeature(Vehicle::Get(this->window_number)->type), this->window_number);
  }
 
  void ShowNewGRFInspectWindow() const override
  {
    ::ShowNewGRFInspectWindow(GetGrfSpecFeature(Vehicle::Get(this->window_number)->type), this->window_number);
  }
 
  static inline HotkeyList hotkeys{"vehicleview", {
    Hotkey('H', "honk", WID_VV_HONK_HORN),
  }};
};

static WindowDesc _vehicle_view_desc(
  WDP_AUTO, "view_vehicle", 250, 116,
  WC_VEHICLE_VIEW, WC_NONE,
  {},
  _nested_vehicle_view_widgets,
  &VehicleViewWindow::hotkeys
);

static WindowDesc _train_view_desc(
  WDP_AUTO, "view_vehicle_train", 250, 134,
  WC_VEHICLE_VIEW, WC_NONE,
  {},
  _nested_vehicle_view_widgets,
  &VehicleViewWindow::hotkeys
);

void ShowVehicleViewWindow(const Vehicle *v)
{
  AllocateWindowDescFront<VehicleViewWindow>((v->type == VEH_TRAIN) ? _train_view_desc : _vehicle_view_desc, v->index);
}

bool VehicleClicked(const Vehicle *v)
{
  assert(v != nullptr);
  if (!(_thd.place_mode & HT_VEHICLE)) return false;
 
  v = v->First();
  if (!v->IsPrimaryVehicle()) return false;
 
  return _thd.GetCallbackWnd()->OnVehicleSelect(v);
}

bool VehicleClicked(VehicleList::const_iterator begin, VehicleList::const_iterator end)
{
  assert(begin != end);
  if (!(_thd.place_mode & HT_VEHICLE)) return false;
 
  /* If there is only one vehicle in the group, act as if we clicked a single vehicle */
  if (begin + 1 == end) return _thd.GetCallbackWnd()->OnVehicleSelect(*begin);
 
  return _thd.GetCallbackWnd()->OnVehicleSelect(begin, end);
}

bool VehicleClicked(const GUIVehicleGroup &vehgroup)
{
  return VehicleClicked(vehgroup.vehicles_begin, vehgroup.vehicles_end);
}
 
void StopGlobalFollowVehicle(const Vehicle *v)
{
  Window *w = GetMainWindow();
  if (w->viewport->follow_vehicle == v->index) {
    ScrollMainWindowTo(v->x_pos, v->y_pos, v->z_pos, true); // lock the main view on the vehicle's last position
    w->viewport->CancelFollow(*w);
  }
}
 

void CcBuildPrimaryVehicle(Commands, const CommandCost &result, VehicleID new_veh_id, uint, uint16_t, CargoArray)
{
  if (result.Failed()) return;
 
  const Vehicle *v = Vehicle::Get(new_veh_id);
  ShowVehicleViewWindow(v);
}

int GetSingleVehicleWidth(const Vehicle *v, EngineImageType image_type)
{
  switch (v->type) {
    case VEH_TRAIN:
      return Train::From(v)->GetDisplayImageWidth();
 
    case VEH_ROAD:
      return RoadVehicle::From(v)->GetDisplayImageWidth();
 
    default:
      bool rtl = _current_text_dir == TD_RTL;
      VehicleSpriteSeq seq;
      v->GetImage(rtl ? DIR_E : DIR_W, image_type, &seq);
      Rect rec;
      seq.GetBounds(&rec);
      return UnScaleGUI(rec.Width());
  }
}

int GetVehicleWidth(const Vehicle *v, EngineImageType image_type)
{
  if (v->type == VEH_TRAIN || v->type == VEH_ROAD) {
    int vehicle_width = 0;
    for (const Vehicle *u = v; u != nullptr; u = u->Next()) {
      vehicle_width += GetSingleVehicleWidth(u, image_type);
    }
    return vehicle_width;
  } else {
    return GetSingleVehicleWidth(v, image_type);
  }
}

void SetMouseCursorVehicle(const Vehicle *v, EngineImageType image_type)
{
  bool rtl = _current_text_dir == TD_RTL;
 
  _cursor.sprites.clear();
  int total_width = 0;
  int y_offset = 0;
  bool rotor_seq = false; // Whether to draw the rotor of the vehicle in this step.
  bool is_ground_vehicle = v->IsGroundVehicle();
 
  while (v != nullptr) {
    if (total_width >= ScaleSpriteTrad(2 * (int)VEHICLEINFO_FULL_VEHICLE_WIDTH)) break;
 
    PaletteID pal = v->vehstatus.Test(VehState::Crashed) ? PALETTE_CRASH : GetVehiclePalette(v);
    VehicleSpriteSeq seq;
 
    if (rotor_seq) {
      GetCustomRotorSprite(Aircraft::From(v), image_type, &seq);
      if (!seq.IsValid()) seq.Set(SPR_ROTOR_STOPPED);
      y_offset = -ScaleSpriteTrad(5);
    } else {
      v->GetImage(rtl ? DIR_E : DIR_W, image_type, &seq);
    }
 
    int x_offs = 0;
    if (v->type == VEH_TRAIN) x_offs = Train::From(v)->GetCursorImageOffset();
 
    for (uint i = 0; i < seq.count; ++i) {
      PaletteID pal2 = v->vehstatus.Test(VehState::Crashed) || !seq.seq[i].pal ? pal : seq.seq[i].pal;
      _cursor.sprites.emplace_back(seq.seq[i].sprite, pal2, rtl ? (-total_width + x_offs) : (total_width + x_offs), y_offset);
    }
 
    if (v->type == VEH_AIRCRAFT && v->subtype == AIR_HELICOPTER && !rotor_seq) {
      /* Draw rotor part in the next step. */
      rotor_seq = true;
    } else {
      total_width += GetSingleVehicleWidth(v, image_type);
      v = v->HasArticulatedPart() ? v->GetNextArticulatedPart() : nullptr;
    }
  }
 
  if (is_ground_vehicle) {
    /* Center trains and road vehicles on the front vehicle */
    int offs = (ScaleSpriteTrad(VEHICLEINFO_FULL_VEHICLE_WIDTH) - total_width) / 2;
    if (rtl) offs = -offs;
    for (auto &cs : _cursor.sprites) {
      cs.pos.x += offs;
    }
  }
 
  UpdateCursorSize();
}