town_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 <http://www.gnu.org/licenses/>.
 */
 
#include "stdafx.h"
#include "town.h"
#include "viewport_func.h"
#include "error.h"
#include "gui.h"
#include "house.h"
#include "newgrf_cargo.h"
#include "newgrf_house.h"
#include "newgrf_text.h"
#include "picker_gui.h"
#include "command_func.h"
#include "company_func.h"
#include "company_base.h"
#include "company_gui.h"
#include "network/network.h"
#include "string_func.h"
#include "strings_func.h"
#include "sound_func.h"
#include "tilehighlight_func.h"
#include "sortlist_type.h"
#include "road_cmd.h"
#include "landscape.h"
#include "querystring_gui.h"
#include "window_func.h"
#include "townname_func.h"
#include "core/backup_type.hpp"
#include "core/geometry_func.hpp"
#include "core/string_consumer.hpp"
#include "genworld.h"
#include "fios.h"
#include "stringfilter_type.h"
#include "dropdown_func.h"
#include "town_kdtree.h"
#include "town_cmd.h"
#include "timer/timer.h"
#include "timer/timer_game_calendar.h"
#include "timer/timer_window.h"
#include "zoom_func.h"
#include "hotkeys.h"
#include "graph_gui.h"
 
#include "widgets/town_widget.h"
 
#include "table/strings.h"
 
#include "safeguards.h"
 
TownKdtree _town_local_authority_kdtree{};
 
typedef GUIList<const Town*, const bool &> GUITownList;
 
static constexpr NWidgetPart _nested_town_authority_widgets[] = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_BROWN),
    NWidget(WWT_CAPTION, COLOUR_BROWN, WID_TA_CAPTION),
    NWidget(WWT_TEXTBTN, COLOUR_BROWN, WID_TA_ZONE_BUTTON), SetMinimalSize(50, 0), SetStringTip(STR_LOCAL_AUTHORITY_ZONE, STR_LOCAL_AUTHORITY_ZONE_TOOLTIP),
    NWidget(WWT_SHADEBOX, COLOUR_BROWN),
    NWidget(WWT_DEFSIZEBOX, COLOUR_BROWN),
    NWidget(WWT_STICKYBOX, COLOUR_BROWN),
  EndContainer(),
  NWidget(WWT_PANEL, COLOUR_BROWN, WID_TA_RATING_INFO), SetMinimalSize(317, 92), SetResize(1, 1), EndContainer(),
  NWidget(WWT_PANEL, COLOUR_BROWN, WID_TA_COMMAND_LIST), SetMinimalSize(317, 52), SetResize(1, 0), SetToolTip(STR_LOCAL_AUTHORITY_ACTIONS_TOOLTIP), EndContainer(),
  NWidget(WWT_PANEL, COLOUR_BROWN, WID_TA_ACTION_INFO), SetMinimalSize(317, 52), SetResize(1, 0), EndContainer(),
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_PUSHTXTBTN, COLOUR_BROWN, WID_TA_EXECUTE),  SetMinimalSize(317, 12), SetResize(1, 0), SetFill(1, 0), SetStringTip(STR_LOCAL_AUTHORITY_DO_IT_BUTTON, STR_LOCAL_AUTHORITY_DO_IT_TOOLTIP),
    NWidget(WWT_RESIZEBOX, COLOUR_BROWN),
  EndContainer()
};
 
struct TownAuthorityWindow : Window {
private:
  Town *town = nullptr; 
  TownAction sel_action = TownAction::End; 
  TownActions displayed_actions_on_previous_painting{}; 
  TownActions enabled_actions{}; 
  TownActions available_actions{}; 
  std::array<StringID, to_underlying(TownAction::End)> action_tooltips{};
 
  Dimension icon_size{}; 
  Dimension exclusive_size{}; 
 
  static TownActions GetEnabledActions()
  {
    TownActions enabled{};
    enabled.Set();
 
    if (!_settings_game.economy.fund_roads) enabled.Reset(TownAction::RoadRebuild);
    if (!_settings_game.economy.fund_buildings) enabled.Reset(TownAction::FundBuildings);
    if (!_settings_game.economy.exclusive_rights) enabled.Reset(TownAction::BuyRights);
    if (!_settings_game.economy.bribe) enabled.Reset(TownAction::Bribe);
 
    return enabled;
  }
 
public:
  TownAuthorityWindow(WindowDesc &desc, WindowNumber window_number) : Window(desc)
  {
    this->town = Town::Get(window_number);
    this->enabled_actions = GetEnabledActions();
 
    auto realtime = TimerGameEconomy::UsingWallclockUnits();
    this->action_tooltips[0] = STR_LOCAL_AUTHORITY_ACTION_TOOLTIP_SMALL_ADVERTISING;
    this->action_tooltips[1] = STR_LOCAL_AUTHORITY_ACTION_TOOLTIP_MEDIUM_ADVERTISING;
    this->action_tooltips[2] = STR_LOCAL_AUTHORITY_ACTION_TOOLTIP_LARGE_ADVERTISING;
    this->action_tooltips[3] = realtime ? STR_LOCAL_AUTHORITY_ACTION_TOOLTIP_ROAD_RECONSTRUCTION_MINUTES : STR_LOCAL_AUTHORITY_ACTION_TOOLTIP_ROAD_RECONSTRUCTION_MONTHS;
    this->action_tooltips[4] = STR_LOCAL_AUTHORITY_ACTION_TOOLTIP_STATUE_OF_COMPANY;
    this->action_tooltips[5] = STR_LOCAL_AUTHORITY_ACTION_TOOLTIP_NEW_BUILDINGS;
    this->action_tooltips[6] = realtime ? STR_LOCAL_AUTHORITY_ACTION_TOOLTIP_EXCLUSIVE_TRANSPORT_MINUTES : STR_LOCAL_AUTHORITY_ACTION_TOOLTIP_EXCLUSIVE_TRANSPORT_MONTHS;
    this->action_tooltips[7] = STR_LOCAL_AUTHORITY_ACTION_TOOLTIP_BRIBE;
 
    this->InitNested(window_number);
  }
 
  void OnInit() override
  {
    this->icon_size      = GetSpriteSize(SPR_COMPANY_ICON);
    this->exclusive_size = GetSpriteSize(SPR_EXCLUSIVE_TRANSPORT);
  }
 
  void OnPaint() override
  {
    this->available_actions = GetMaskOfTownActions(_local_company, this->town);
    if (this->available_actions != displayed_actions_on_previous_painting) this->SetDirty();
    displayed_actions_on_previous_painting = this->available_actions;
 
    this->SetWidgetLoweredState(WID_TA_ZONE_BUTTON, this->town->show_zone);
    this->SetWidgetDisabledState(WID_TA_EXECUTE, (this->sel_action == TownAction::End) || !this->available_actions.Test(this->sel_action));
 
    this->DrawWidgets();
    if (!this->IsShaded())
    {
      this->DrawRatings();
      this->DrawActions();
    }
  }
 
  StringID GetRatingString(int rating) const
  {
    if (rating > RATING_EXCELLENT) return STR_CARGO_RATING_OUTSTANDING;
    if (rating > RATING_VERYGOOD)  return STR_CARGO_RATING_EXCELLENT;
    if (rating > RATING_GOOD)      return STR_CARGO_RATING_VERY_GOOD;
    if (rating > RATING_MEDIOCRE)  return STR_CARGO_RATING_GOOD;
    if (rating > RATING_POOR)      return STR_CARGO_RATING_MEDIOCRE;
    if (rating > RATING_VERYPOOR)  return STR_CARGO_RATING_POOR;
    if (rating > RATING_APPALLING) return STR_CARGO_RATING_VERY_POOR;
    return STR_CARGO_RATING_APPALLING;
  }
 
  void DrawRatings()
  {
    Rect r = this->GetWidget<NWidgetBase>(WID_TA_RATING_INFO)->GetCurrentRect().Shrink(WidgetDimensions::scaled.framerect);
 
    int text_y_offset      = (this->resize.step_height - GetCharacterHeight(FS_NORMAL)) / 2;
    int icon_y_offset      = (this->resize.step_height - this->icon_size.height) / 2;
    int exclusive_y_offset = (this->resize.step_height - this->exclusive_size.height) / 2;
 
    DrawString(r.left, r.right, r.top + text_y_offset, STR_LOCAL_AUTHORITY_COMPANY_RATINGS);
    r.top += this->resize.step_height;
 
    bool rtl = _current_text_dir == TD_RTL;
    Rect icon      = r.WithWidth(this->icon_size.width, rtl);
    Rect exclusive = r.Indent(this->icon_size.width + WidgetDimensions::scaled.hsep_normal, rtl).WithWidth(this->exclusive_size.width, rtl);
    Rect text      = r.Indent(this->icon_size.width + WidgetDimensions::scaled.hsep_normal + this->exclusive_size.width + WidgetDimensions::scaled.hsep_normal, rtl);
 
    /* Draw list of companies */
    for (const Company *c : Company::Iterate()) {
      if ((this->town->have_ratings.Test(c->index) || this->town->exclusivity == c->index)) {
        DrawCompanyIcon(c->index, icon.left, text.top + icon_y_offset);
 
        if (this->town->exclusivity == c->index) {
          DrawSprite(SPR_EXCLUSIVE_TRANSPORT, GetCompanyPalette(c->index), exclusive.left, text.top + exclusive_y_offset);
        }
 
        int rating = this->town->ratings[c->index];
        DrawString(text.left, text.right, text.top + text_y_offset, GetString(STR_LOCAL_AUTHORITY_COMPANY_RATING, c->index, c->index, GetRatingString(rating)));
        text.top += this->resize.step_height;
      }
    }
 
    text.bottom = text.top - 1;
    if (text.bottom > r.bottom) {
      /* If the company list is too big to fit, mark ourself dirty and draw again. */
      ResizeWindow(this, 0, text.bottom - r.bottom, false);
    }
  }
 
  void DrawActions()
  {
    Rect r = this->GetWidget<NWidgetBase>(WID_TA_COMMAND_LIST)->GetCurrentRect().Shrink(WidgetDimensions::scaled.framerect);
 
    DrawString(r, STR_LOCAL_AUTHORITY_ACTIONS_TITLE);
    r.top += GetCharacterHeight(FS_NORMAL);
 
    /* Draw list of actions */
    for (TownAction i = {}; i != TownAction::End; ++i) {
      /* Don't show actions if disabled in settings. */
      if (!this->enabled_actions.Test(i)) continue;
 
      /* Set colour of action based on ability to execute and if selected. */
      TextColour action_colour = TC_GREY | TC_NO_SHADE;
      if (this->available_actions.Test(i)) action_colour = TC_ORANGE;
      if (this->sel_action == i) action_colour = TC_WHITE;
 
      DrawString(r, STR_LOCAL_AUTHORITY_ACTION_SMALL_ADVERTISING_CAMPAIGN + to_underlying(i), action_colour);
      r.top += GetCharacterHeight(FS_NORMAL);
    }
  }
 
  std::string GetWidgetString(WidgetID widget, StringID stringid) const override
  {
    if (widget == WID_TA_CAPTION) return GetString(STR_LOCAL_AUTHORITY_CAPTION, this->window_number);
 
    return this->Window::GetWidgetString(widget, stringid);
  }
 
  void DrawWidget(const Rect &r, WidgetID widget) const override
  {
    switch (widget) {
      case WID_TA_ACTION_INFO:
        if (this->sel_action != TownAction::End) {
          Money action_cost = _price[PR_TOWN_ACTION] * GetTownActionCost(this->sel_action) >> 8;
          bool affordable = Company::IsValidID(_local_company) && action_cost < GetAvailableMoney(_local_company);
 
          DrawStringMultiLine(r.Shrink(WidgetDimensions::scaled.framerect),
            GetString(this->action_tooltips[to_underlying(this->sel_action)], action_cost),
            affordable ? TC_YELLOW : TC_RED);
        }
        break;
    }
  }
 
  void UpdateWidgetSize(WidgetID widget, Dimension &size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension &fill, [[maybe_unused]] Dimension &resize) override
  {
    switch (widget) {
      case WID_TA_ACTION_INFO: {
        assert(size.width > padding.width && size.height > padding.height);
        Dimension d = {0, 0};
        for (TownAction i = {}; i != TownAction::End; ++i) {
          Money price = _price[PR_TOWN_ACTION] * GetTownActionCost(i) >> 8;
          d = maxdim(d, GetStringMultiLineBoundingBox(GetString(this->action_tooltips[to_underlying(i)], price), size));
        }
        d.width += padding.width;
        d.height += padding.height;
        size = maxdim(size, d);
        break;
      }
 
      case WID_TA_COMMAND_LIST:
        size.height = (to_underlying(TownAction::End) + 1) * GetCharacterHeight(FS_NORMAL) + padding.height;
        size.width = GetStringBoundingBox(STR_LOCAL_AUTHORITY_ACTIONS_TITLE).width;
        for (TownAction i = {}; i != TownAction::End; ++i) {
          size.width = std::max(size.width, GetStringBoundingBox(STR_LOCAL_AUTHORITY_ACTION_SMALL_ADVERTISING_CAMPAIGN + to_underlying(i)).width + padding.width);
        }
        size.width += padding.width;
        break;
 
      case WID_TA_RATING_INFO:
        fill.height = resize.height = std::max({this->icon_size.height + WidgetDimensions::scaled.vsep_normal, this->exclusive_size.height + WidgetDimensions::scaled.vsep_normal, (uint)GetCharacterHeight(FS_NORMAL)});
        size.height = 9 * resize.height + padding.height;
        break;
    }
  }
 
  void OnClick([[maybe_unused]] Point pt, WidgetID widget, [[maybe_unused]] int click_count) override
  {
    switch (widget) {
      case WID_TA_ZONE_BUTTON: {
        bool new_show_state = !this->town->show_zone;
        TownID index = this->town->index;
 
        new_show_state ? _town_local_authority_kdtree.Insert(index) : _town_local_authority_kdtree.Remove(index);
 
        this->town->show_zone = new_show_state;
        this->SetWidgetLoweredState(widget, new_show_state);
        SndClickBeep();
        MarkWholeScreenDirty();
        break;
      }
 
      case WID_TA_COMMAND_LIST: {
        int y = this->GetRowFromWidget(pt.y, WID_TA_COMMAND_LIST, 1, GetCharacterHeight(FS_NORMAL)) - 1;
 
        auto action = this->enabled_actions.GetNthSetBit(y);
        if (!action.has_value()) break;
 
        this->sel_action = *action;
        this->SetDirty();
 
        /* When double-clicking, continue */
        if (click_count == 1 || !this->available_actions.Test(this->sel_action)) break;
        [[fallthrough]];
      }
 
      case WID_TA_EXECUTE:
        Command<CMD_DO_TOWN_ACTION>::Post(STR_ERROR_CAN_T_DO_THIS, this->town->xy, static_cast<TownID>(this->window_number), this->sel_action);
        break;
    }
  }
 
  const IntervalTimer<TimerWindow> redraw_interval = {std::chrono::seconds(3), [this](auto) {
    this->SetDirty();
  }};
 
  void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
  {
    if (!gui_scope) return;
 
    this->enabled_actions = this->GetEnabledActions();
    if (!this->enabled_actions.Test(this->sel_action)) {
      this->sel_action = TownAction::End;
    }
  }
};
 
static WindowDesc _town_authority_desc(
  WDP_AUTO, "view_town_authority", 317, 222,
  WC_TOWN_AUTHORITY, WC_NONE,
  {},
  _nested_town_authority_widgets
);
 
static void ShowTownAuthorityWindow(uint town)
{
  AllocateWindowDescFront<TownAuthorityWindow>(_town_authority_desc, town);
}
 
 
/* Town view window. */
struct TownViewWindow : Window {
private:
  Town *town = nullptr; 
 
public:
  static const int WID_TV_HEIGHT_NORMAL = 150;
 
  TownViewWindow(WindowDesc &desc, WindowNumber window_number) : Window(desc)
  {
    this->CreateNestedTree();
 
    this->town = Town::Get(window_number);
 
    this->FinishInitNested(window_number);
 
    this->flags.Set(WindowFlag::DisableVpScroll);
    NWidgetViewport *nvp = this->GetWidget<NWidgetViewport>(WID_TV_VIEWPORT);
    nvp->InitializeViewport(this, this->town->xy, ScaleZoomGUI(ZoomLevel::Town));
 
    /* disable renaming town in network games if you are not the server */
    this->SetWidgetDisabledState(WID_TV_CHANGE_NAME, _networking && !_network_server);
  }
 
  void Close([[maybe_unused]] int data = 0) override
  {
    SetViewportCatchmentTown(Town::Get(this->window_number), false);
    this->Window::Close();
  }
 
  std::string GetWidgetString(WidgetID widget, StringID stringid) const override
  {
    if (widget == WID_TV_CAPTION) return GetString(this->town->larger_town ? STR_TOWN_VIEW_CITY_CAPTION : STR_TOWN_VIEW_TOWN_CAPTION, this->town->index);
 
    return this->Window::GetWidgetString(widget, stringid);
  }
 
  void OnPaint() override
  {
    extern const Town *_viewport_highlight_town;
    this->SetWidgetLoweredState(WID_TV_CATCHMENT, _viewport_highlight_town == this->town);
 
    this->DrawWidgets();
  }
 
  void DrawWidget(const Rect &r, WidgetID widget) const override
  {
    if (widget != WID_TV_INFO) return;
 
    Rect tr = r.Shrink(WidgetDimensions::scaled.framerect);
 
    DrawString(tr, GetString(STR_TOWN_VIEW_POPULATION_HOUSES, this->town->cache.population, this->town->cache.num_houses));
    tr.top += GetCharacterHeight(FS_NORMAL);
 
    StringID str_last_period = TimerGameEconomy::UsingWallclockUnits() ? STR_TOWN_VIEW_CARGO_LAST_MINUTE_MAX : STR_TOWN_VIEW_CARGO_LAST_MONTH_MAX;
 
    for (auto tpe : {TPE_PASSENGERS, TPE_MAIL}) {
      for (const CargoSpec *cs : CargoSpec::town_production_cargoes[tpe]) {
        CargoType cargo_type = cs->Index();
        auto it = this->town->GetCargoSupplied(cargo_type);
        if (it == std::end(this->town->supplied)) {
          DrawString(tr, GetString(str_last_period, 1ULL << cargo_type, 0, 0));
        } else {
          DrawString(tr, GetString(str_last_period, 1ULL << cargo_type, it->history[LAST_MONTH].transported, it->history[LAST_MONTH].production));
        }
        tr.top += GetCharacterHeight(FS_NORMAL);
      }
    }
 
    bool first = true;
    for (int i = TAE_BEGIN; i < TAE_END; i++) {
      if (this->town->goal[i] == 0) continue;
      if (this->town->goal[i] == TOWN_GROWTH_WINTER && (TileHeight(this->town->xy) < LowestSnowLine() || this->town->cache.population <= 90)) continue;
      if (this->town->goal[i] == TOWN_GROWTH_DESERT && (GetTropicZone(this->town->xy) != TROPICZONE_DESERT || this->town->cache.population <= 60)) continue;
 
      if (first) {
        DrawString(tr, STR_TOWN_VIEW_CARGO_FOR_TOWNGROWTH);
        tr.top += GetCharacterHeight(FS_NORMAL);
        first = false;
      }
 
      bool rtl = _current_text_dir == TD_RTL;
 
      const CargoSpec *cargo = FindFirstCargoWithTownAcceptanceEffect((TownAcceptanceEffect)i);
      assert(cargo != nullptr);
 
      StringID string;
 
      if (this->town->goal[i] == TOWN_GROWTH_DESERT || this->town->goal[i] == TOWN_GROWTH_WINTER) {
        /* For 'original' gameplay, don't show the amount required (you need 1 or more ..) */
        string = STR_TOWN_VIEW_CARGO_FOR_TOWNGROWTH_DELIVERED_GENERAL;
        if (this->town->received[i].old_act == 0) {
          string = STR_TOWN_VIEW_CARGO_FOR_TOWNGROWTH_REQUIRED_GENERAL;
 
          if (this->town->goal[i] == TOWN_GROWTH_WINTER && TileHeight(this->town->xy) < GetSnowLine()) {
            string = STR_TOWN_VIEW_CARGO_FOR_TOWNGROWTH_REQUIRED_WINTER;
          }
        }
 
        DrawString(tr.Indent(20, rtl), GetString(string, cargo->name));
      } else {
        string = STR_TOWN_VIEW_CARGO_FOR_TOWNGROWTH_DELIVERED;
        if (this->town->received[i].old_act < this->town->goal[i]) {
          string = STR_TOWN_VIEW_CARGO_FOR_TOWNGROWTH_REQUIRED;
        }
        DrawString(tr.Indent(20, rtl), GetString(string, cargo->Index(), this->town->received[i].old_act, cargo->Index(), this->town->goal[i]));
      }
      tr.top += GetCharacterHeight(FS_NORMAL);
    }
 
    if (this->town->flags.Test(TownFlag::IsGrowing)) {
      DrawString(tr, GetString(this->town->fund_buildings_months == 0 ? STR_TOWN_VIEW_TOWN_GROWS_EVERY : STR_TOWN_VIEW_TOWN_GROWS_EVERY_FUNDED, RoundDivSU(this->town->growth_rate + 1, Ticks::DAY_TICKS)));
      tr.top += GetCharacterHeight(FS_NORMAL);
    } else {
      DrawString(tr, STR_TOWN_VIEW_TOWN_GROW_STOPPED);
      tr.top += GetCharacterHeight(FS_NORMAL);
    }
 
    /* only show the town noise, if the noise option is activated. */
    if (_settings_game.economy.station_noise_level) {
      DrawString(tr, GetString(STR_TOWN_VIEW_NOISE_IN_TOWN, this->town->noise_reached, this->town->MaxTownNoise()));
      tr.top += GetCharacterHeight(FS_NORMAL);
    }
 
    if (!this->town->text.empty()) {
      tr.top = DrawStringMultiLine(tr, this->town->text.GetDecodedString(), TC_BLACK);
    }
  }
 
  void OnClick([[maybe_unused]] Point pt, WidgetID widget, [[maybe_unused]] int click_count) override
  {
    switch (widget) {
      case WID_TV_CENTER_VIEW: // scroll to location
        if (_ctrl_pressed) {
          ShowExtraViewportWindow(this->town->xy);
        } else {
          ScrollMainWindowToTile(this->town->xy);
        }
        break;
 
      case WID_TV_SHOW_AUTHORITY: // town authority
        ShowTownAuthorityWindow(this->window_number);
        break;
 
      case WID_TV_CHANGE_NAME: // rename
        ShowQueryString(GetString(STR_TOWN_NAME, this->window_number), STR_TOWN_VIEW_RENAME_TOWN_BUTTON, MAX_LENGTH_TOWN_NAME_CHARS, this, CS_ALPHANUMERAL, {QueryStringFlag::EnableDefault, QueryStringFlag::LengthIsInChars});
        break;
 
      case WID_TV_CATCHMENT:
        SetViewportCatchmentTown(Town::Get(this->window_number), !this->IsWidgetLowered(WID_TV_CATCHMENT));
        break;
 
      case WID_TV_EXPAND: // expand town - only available on Scenario editor
        Command<CMD_EXPAND_TOWN>::Post(STR_ERROR_CAN_T_EXPAND_TOWN, static_cast<TownID>(this->window_number), 0, {TownExpandMode::Buildings, TownExpandMode::Roads});
        break;
 
      case WID_TV_EXPAND_BUILDINGS: // expand buildings of town - only available on Scenario editor
        Command<CMD_EXPAND_TOWN>::Post(STR_ERROR_CAN_T_EXPAND_TOWN, static_cast<TownID>(this->window_number), 0, {TownExpandMode::Buildings});
        break;
 
      case WID_TV_EXPAND_ROADS: // expand roads of town - only available on Scenario editor
        Command<CMD_EXPAND_TOWN>::Post(STR_ERROR_CAN_T_EXPAND_TOWN, static_cast<TownID>(this->window_number), 0, {TownExpandMode::Roads});
        break;
 
      case WID_TV_DELETE: // delete town - only available on Scenario editor
        Command<CMD_DELETE_TOWN>::Post(STR_ERROR_TOWN_CAN_T_DELETE, static_cast<TownID>(this->window_number));
        break;
 
      case WID_TV_GRAPH: {
        ShowTownCargoGraph(this->window_number);
        break;
      }
    }
  }
 
  void UpdateWidgetSize(WidgetID widget, Dimension &size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension &fill, [[maybe_unused]] Dimension &resize) override
  {
    switch (widget) {
      case WID_TV_INFO:
        size.height = GetDesiredInfoHeight(size.width) + padding.height;
        break;
    }
  }
 
  uint GetDesiredInfoHeight(int width) const
  {
    uint aimed_height = static_cast<uint>(1 + CargoSpec::town_production_cargoes[TPE_PASSENGERS].size() + CargoSpec::town_production_cargoes[TPE_MAIL].size()) * GetCharacterHeight(FS_NORMAL);
 
    bool first = true;
    for (int i = TAE_BEGIN; i < TAE_END; i++) {
      if (this->town->goal[i] == 0) continue;
      if (this->town->goal[i] == TOWN_GROWTH_WINTER && (TileHeight(this->town->xy) < LowestSnowLine() || this->town->cache.population <= 90)) continue;
      if (this->town->goal[i] == TOWN_GROWTH_DESERT && (GetTropicZone(this->town->xy) != TROPICZONE_DESERT || this->town->cache.population <= 60)) continue;
 
      if (first) {
        aimed_height += GetCharacterHeight(FS_NORMAL);
        first = false;
      }
      aimed_height += GetCharacterHeight(FS_NORMAL);
    }
    aimed_height += GetCharacterHeight(FS_NORMAL);
 
    if (_settings_game.economy.station_noise_level) aimed_height += GetCharacterHeight(FS_NORMAL);
 
    if (!this->town->text.empty()) {
      aimed_height += GetStringHeight(this->town->text.GetDecodedString(), width - WidgetDimensions::scaled.framerect.Horizontal());
    }
 
    return aimed_height;
  }
 
  void ResizeWindowAsNeeded()
  {
    const NWidgetBase *nwid_info = this->GetWidget<NWidgetBase>(WID_TV_INFO);
    uint aimed_height = GetDesiredInfoHeight(nwid_info->current_x);
    if (aimed_height > nwid_info->current_y || (aimed_height < nwid_info->current_y && nwid_info->current_y > nwid_info->smallest_y)) {
      this->ReInit();
    }
  }
 
  void OnResize() override
  {
    if (this->viewport != nullptr) {
      NWidgetViewport *nvp = this->GetWidget<NWidgetViewport>(WID_TV_VIEWPORT);
      nvp->UpdateViewportCoordinates(this);
 
      ScrollWindowToTile(this->town->xy, this, true); // Re-center viewport.
    }
  }
 
  void OnMouseWheel(int wheel, WidgetID widget) override
  {
    if (widget != WID_TV_VIEWPORT) return;
    if (_settings_client.gui.scrollwheel_scrolling != SWS_OFF) {
      DoZoomInOutWindow(wheel < 0 ? ZOOM_IN : ZOOM_OUT, this);
    }
  }
 
  void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
  {
    if (!gui_scope) return;
    /* Called when setting station noise or required cargoes have changed, in order to resize the window */
    this->SetDirty(); // refresh display for current size. This will allow to avoid glitches when downgrading
    this->ResizeWindowAsNeeded();
  }
 
  void OnQueryTextFinished(std::optional<std::string> str) override
  {
    if (!str.has_value()) return;
 
    Command<CMD_RENAME_TOWN>::Post(STR_ERROR_CAN_T_RENAME_TOWN, static_cast<TownID>(this->window_number), *str);
  }
 
  const IntervalTimer<TimerGameCalendar> daily_interval = {{TimerGameCalendar::DAY, TimerGameCalendar::Priority::NONE}, [this](auto) {
    /* Refresh after possible snowline change */
    this->SetDirty();
  }};
};
 
static constexpr NWidgetPart _nested_town_game_view_widgets[] = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_BROWN),
    NWidget(WWT_PUSHIMGBTN, COLOUR_BROWN, WID_TV_CHANGE_NAME), SetAspect(WidgetDimensions::ASPECT_RENAME), SetSpriteTip(SPR_RENAME, STR_TOWN_VIEW_RENAME_TOOLTIP),
    NWidget(WWT_CAPTION, COLOUR_BROWN, WID_TV_CAPTION),
    NWidget(WWT_PUSHIMGBTN, COLOUR_BROWN, WID_TV_CENTER_VIEW), SetAspect(WidgetDimensions::ASPECT_LOCATION), SetSpriteTip(SPR_GOTO_LOCATION, STR_TOWN_VIEW_CENTER_TOOLTIP),
    NWidget(WWT_SHADEBOX, COLOUR_BROWN),
    NWidget(WWT_DEFSIZEBOX, COLOUR_BROWN),
    NWidget(WWT_STICKYBOX, COLOUR_BROWN),
  EndContainer(),
  NWidget(WWT_PANEL, COLOUR_BROWN),
    NWidget(WWT_INSET, COLOUR_BROWN), SetPadding(2, 2, 2, 2),
      NWidget(NWID_VIEWPORT, INVALID_COLOUR, WID_TV_VIEWPORT), SetMinimalSize(254, 86), SetFill(1, 0), SetResize(1, 1),
    EndContainer(),
  EndContainer(),
  NWidget(WWT_PANEL, COLOUR_BROWN, WID_TV_INFO), SetMinimalSize(260, 32), SetResize(1, 0), SetFill(1, 0), EndContainer(),
  NWidget(NWID_HORIZONTAL, NWidContainerFlag::EqualSize),
    NWidget(WWT_PUSHTXTBTN, COLOUR_BROWN, WID_TV_SHOW_AUTHORITY), SetMinimalSize(80, 12), SetFill(1, 1), SetResize(1, 0), SetStringTip(STR_TOWN_VIEW_LOCAL_AUTHORITY_BUTTON, STR_TOWN_VIEW_LOCAL_AUTHORITY_TOOLTIP),
    NWidget(WWT_TEXTBTN, COLOUR_BROWN, WID_TV_CATCHMENT), SetMinimalSize(40, 12), SetFill(1, 1), SetResize(1, 0), SetStringTip(STR_BUTTON_CATCHMENT, STR_TOOLTIP_CATCHMENT),
    NWidget(WWT_PUSHTXTBTN, COLOUR_BROWN, WID_TV_GRAPH), SetFill(1, 0), SetResize(1, 0), SetStringTip(STR_TOWN_VIEW_CARGO_GRAPH, STR_TOWN_VIEW_CARGO_GRAPH_TOOLTIP),
    NWidget(WWT_RESIZEBOX, COLOUR_BROWN),
  EndContainer(),
};
 
static WindowDesc _town_game_view_desc(
  WDP_AUTO, "view_town", 260, TownViewWindow::WID_TV_HEIGHT_NORMAL,
  WC_TOWN_VIEW, WC_NONE,
  {},
  _nested_town_game_view_widgets
);
 
static constexpr NWidgetPart _nested_town_editor_view_widgets[] = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_BROWN),
    NWidget(WWT_PUSHIMGBTN, COLOUR_BROWN, WID_TV_CHANGE_NAME), SetAspect(WidgetDimensions::ASPECT_RENAME), SetSpriteTip(SPR_RENAME, STR_TOWN_VIEW_RENAME_TOOLTIP),
    NWidget(WWT_CAPTION, COLOUR_BROWN, WID_TV_CAPTION), SetToolTip(STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
    NWidget(WWT_PUSHIMGBTN, COLOUR_BROWN, WID_TV_CENTER_VIEW), SetAspect(WidgetDimensions::ASPECT_LOCATION), SetSpriteTip(SPR_GOTO_LOCATION, STR_TOWN_VIEW_CENTER_TOOLTIP),
    NWidget(WWT_SHADEBOX, COLOUR_BROWN),
    NWidget(WWT_DEFSIZEBOX, COLOUR_BROWN),
    NWidget(WWT_STICKYBOX, COLOUR_BROWN),
  EndContainer(),
  NWidget(WWT_PANEL, COLOUR_BROWN),
    NWidget(WWT_INSET, COLOUR_BROWN), SetPadding(2, 2, 2, 2),
      NWidget(NWID_VIEWPORT, INVALID_COLOUR, WID_TV_VIEWPORT), SetMinimalSize(254, 86), SetFill(1, 1), SetResize(1, 1),
    EndContainer(),
  EndContainer(),
  NWidget(WWT_PANEL, COLOUR_BROWN, WID_TV_INFO), SetMinimalSize(260, 32), SetResize(1, 0), SetFill(1, 0), EndContainer(),
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_PUSHTXTBTN, COLOUR_BROWN, WID_TV_EXPAND), SetFill(1, 1), SetResize(1, 0), SetStringTip(STR_TOWN_VIEW_EXPAND_BUTTON, STR_TOWN_VIEW_EXPAND_TOOLTIP),
    NWidget(WWT_PUSHTXTBTN, COLOUR_BROWN, WID_TV_EXPAND_BUILDINGS), SetFill(1, 1), SetResize(1, 0), SetStringTip(STR_TOWN_VIEW_EXPAND_BUILDINGS_BUTTON, STR_TOWN_VIEW_EXPAND_BUILDINGS_TOOLTIP),
    NWidget(WWT_PUSHTXTBTN, COLOUR_BROWN, WID_TV_EXPAND_ROADS), SetFill(1, 1), SetResize(1, 0), SetStringTip(STR_TOWN_VIEW_EXPAND_ROADS_BUTTON, STR_TOWN_VIEW_EXPAND_ROADS_TOOLTIP),
  EndContainer(),
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_PUSHTXTBTN, COLOUR_BROWN, WID_TV_DELETE), SetFill(1, 1), SetResize(1, 0), SetStringTip(STR_TOWN_VIEW_DELETE_BUTTON, STR_TOWN_VIEW_DELETE_TOOLTIP),
    NWidget(WWT_TEXTBTN, COLOUR_BROWN, WID_TV_CATCHMENT), SetFill(1, 1), SetResize(1, 0), SetStringTip(STR_BUTTON_CATCHMENT, STR_TOOLTIP_CATCHMENT),
    NWidget(WWT_RESIZEBOX, COLOUR_BROWN),
  EndContainer(),
};
 
static WindowDesc _town_editor_view_desc(
  WDP_AUTO, "view_town_scen", 260, TownViewWindow::WID_TV_HEIGHT_NORMAL,
  WC_TOWN_VIEW, WC_NONE,
  {},
  _nested_town_editor_view_widgets
);
 
void ShowTownViewWindow(TownID town)
{
  if (_game_mode == GM_EDITOR) {
    AllocateWindowDescFront<TownViewWindow>(_town_editor_view_desc, town);
  } else {
    AllocateWindowDescFront<TownViewWindow>(_town_game_view_desc, town);
  }
}
 
static constexpr NWidgetPart _nested_town_directory_widgets[] = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_BROWN),
    NWidget(WWT_CAPTION, COLOUR_BROWN, WID_TD_CAPTION),
    NWidget(WWT_SHADEBOX, COLOUR_BROWN),
    NWidget(WWT_DEFSIZEBOX, COLOUR_BROWN),
    NWidget(WWT_STICKYBOX, COLOUR_BROWN),
  EndContainer(),
  NWidget(NWID_HORIZONTAL),
    NWidget(NWID_VERTICAL),
      NWidget(NWID_HORIZONTAL),
        NWidget(WWT_TEXTBTN, COLOUR_BROWN, WID_TD_SORT_ORDER), SetStringTip(STR_BUTTON_SORT_BY, STR_TOOLTIP_SORT_ORDER),
        NWidget(WWT_DROPDOWN, COLOUR_BROWN, WID_TD_SORT_CRITERIA), SetToolTip(STR_TOOLTIP_SORT_CRITERIA),
        NWidget(WWT_EDITBOX, COLOUR_BROWN, WID_TD_FILTER), SetFill(1, 0), SetResize(1, 0), SetStringTip(STR_LIST_FILTER_OSKTITLE, STR_LIST_FILTER_TOOLTIP),
      EndContainer(),
      NWidget(WWT_PANEL, COLOUR_BROWN, WID_TD_LIST), SetToolTip(STR_TOWN_DIRECTORY_LIST_TOOLTIP),
              SetFill(1, 0), SetResize(1, 1), SetScrollbar(WID_TD_SCROLLBAR), EndContainer(),
      NWidget(WWT_PANEL, COLOUR_BROWN),
        NWidget(WWT_TEXT, INVALID_COLOUR, WID_TD_WORLD_POPULATION), SetPadding(2, 0, 2, 2), SetFill(1, 0), SetResize(1, 0),
      EndContainer(),
    EndContainer(),
    NWidget(NWID_VERTICAL),
      NWidget(NWID_VSCROLLBAR, COLOUR_BROWN, WID_TD_SCROLLBAR),
      NWidget(WWT_RESIZEBOX, COLOUR_BROWN),
    EndContainer(),
  EndContainer(),
};
 
struct TownDirectoryWindow : public Window {
private:
  /* Runtime saved values */
  static Listing last_sorting;
 
  /* Constants for sorting towns */
  static inline const StringID sorter_names[] = {
    STR_SORT_BY_NAME,
    STR_SORT_BY_POPULATION,
    STR_SORT_BY_RATING,
  };
  static const std::initializer_list<GUITownList::SortFunction * const> sorter_funcs;
 
  StringFilter string_filter{}; 
  QueryString townname_editbox; 
 
  GUITownList towns{TownDirectoryWindow::last_sorting.order};
 
  Scrollbar *vscroll = nullptr;
 
  void BuildSortTownList()
  {
    if (this->towns.NeedRebuild()) {
      this->towns.clear();
      this->towns.reserve(Town::GetNumItems());
 
      for (const Town *t : Town::Iterate()) {
        if (this->string_filter.IsEmpty()) {
          this->towns.push_back(t);
          continue;
        }
        this->string_filter.ResetState();
        this->string_filter.AddLine(t->GetCachedName());
        if (this->string_filter.GetState()) this->towns.push_back(t);
      }
 
      this->towns.RebuildDone();
      this->vscroll->SetCount(this->towns.size()); // Update scrollbar as well.
    }
    /* Always sort the towns. */
    this->towns.Sort();
    this->SetWidgetDirty(WID_TD_LIST); // Force repaint of the displayed towns.
  }
 
  static bool TownNameSorter(const Town * const &a, const Town * const &b, const bool &)
  {
    return StrNaturalCompare(a->GetCachedName(), b->GetCachedName()) < 0; // Sort by name (natural sorting).
  }
 
  static bool TownPopulationSorter(const Town * const &a, const Town * const &b, const bool &order)
  {
    uint32_t a_population = a->cache.population;
    uint32_t b_population = b->cache.population;
    if (a_population == b_population) return TownDirectoryWindow::TownNameSorter(a, b, order);
    return a_population < b_population;
  }
 
  static bool TownRatingSorter(const Town * const &a, const Town * const &b, const bool &order)
  {
    bool before = !order; // Value to get 'a' before 'b'.
 
    /* Towns without rating are always after towns with rating. */
    if (a->have_ratings.Test(_local_company)) {
      if (b->have_ratings.Test(_local_company)) {
        int16_t a_rating = a->ratings[_local_company];
        int16_t b_rating = b->ratings[_local_company];
        if (a_rating == b_rating) return TownDirectoryWindow::TownNameSorter(a, b, order);
        return a_rating < b_rating;
      }
      return before;
    }
    if (b->have_ratings.Test(_local_company)) return !before;
 
    /* Sort unrated towns always on ascending town name. */
    if (before) return TownDirectoryWindow::TownNameSorter(a, b, order);
    return TownDirectoryWindow::TownNameSorter(b, a, order);
  }
 
public:
  TownDirectoryWindow(WindowDesc &desc) : Window(desc), townname_editbox(MAX_LENGTH_TOWN_NAME_CHARS * MAX_CHAR_LENGTH, MAX_LENGTH_TOWN_NAME_CHARS)
  {
    this->CreateNestedTree();
 
    this->vscroll = this->GetScrollbar(WID_TD_SCROLLBAR);
 
    this->towns.SetListing(this->last_sorting);
    this->towns.SetSortFuncs(TownDirectoryWindow::sorter_funcs);
    this->towns.ForceRebuild();
    this->BuildSortTownList();
 
    this->FinishInitNested(0);
 
    this->querystrings[WID_TD_FILTER] = &this->townname_editbox;
    this->townname_editbox.cancel_button = QueryString::ACTION_CLEAR;
  }
 
  std::string GetWidgetString(WidgetID widget, StringID stringid) const override
  {
    switch (widget) {
      case WID_TD_CAPTION:
        return GetString(STR_TOWN_DIRECTORY_CAPTION, this->vscroll->GetCount(), Town::GetNumItems());
 
      case WID_TD_WORLD_POPULATION:
        return GetString(STR_TOWN_POPULATION, GetWorldPopulation());
 
      case WID_TD_SORT_CRITERIA:
        return GetString(TownDirectoryWindow::sorter_names[this->towns.SortType()]);
 
      default:
        return this->Window::GetWidgetString(widget, stringid);
    }
  }
 
  static std::string GetTownString(const Town *t, uint64_t population)
  {
    return GetString(t->larger_town ? STR_TOWN_DIRECTORY_CITY : STR_TOWN_DIRECTORY_TOWN, t->index, population);
  }
 
  void DrawWidget(const Rect &r, WidgetID widget) const override
  {
    switch (widget) {
      case WID_TD_SORT_ORDER:
        this->DrawSortButtonState(widget, this->towns.IsDescSortOrder() ? SBS_DOWN : SBS_UP);
        break;
 
      case WID_TD_LIST: {
        Rect tr = r.Shrink(WidgetDimensions::scaled.framerect);
        if (this->towns.empty()) { // No towns available.
          DrawString(tr, STR_TOWN_DIRECTORY_NONE);
          break;
        }
 
        /* At least one town available. */
        bool rtl = _current_text_dir == TD_RTL;
        Dimension icon_size = GetSpriteSize(SPR_TOWN_RATING_GOOD);
        int icon_x = tr.WithWidth(icon_size.width, rtl).left;
        tr = tr.Indent(icon_size.width + WidgetDimensions::scaled.hsep_normal, rtl);
 
        auto [first, last] = this->vscroll->GetVisibleRangeIterators(this->towns);
        for (auto it = first; it != last; ++it) {
          const Town *t = *it;
          assert(t->xy != INVALID_TILE);
 
          /* Draw rating icon. */
          if (_game_mode == GM_EDITOR || !t->have_ratings.Test(_local_company)) {
            DrawSprite(SPR_TOWN_RATING_NA, PAL_NONE, icon_x, tr.top + (this->resize.step_height - icon_size.height) / 2);
          } else {
            SpriteID icon = SPR_TOWN_RATING_APPALLING;
            if (t->ratings[_local_company] > RATING_VERYPOOR) icon = SPR_TOWN_RATING_MEDIOCRE;
            if (t->ratings[_local_company] > RATING_GOOD)     icon = SPR_TOWN_RATING_GOOD;
            DrawSprite(icon, PAL_NONE, icon_x, tr.top + (this->resize.step_height - icon_size.height) / 2);
          }
 
          DrawString(tr.left, tr.right, tr.top + (this->resize.step_height - GetCharacterHeight(FS_NORMAL)) / 2, GetTownString(t, t->cache.population));
 
          tr.top += this->resize.step_height;
        }
        break;
      }
    }
  }
 
  void UpdateWidgetSize(WidgetID widget, Dimension &size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension &fill, [[maybe_unused]] Dimension &resize) override
  {
    switch (widget) {
      case WID_TD_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_TD_SORT_CRITERIA: {
        Dimension d = GetStringListBoundingBox(TownDirectoryWindow::sorter_names);
        d.width += padding.width;
        d.height += padding.height;
        size = maxdim(size, d);
        break;
      }
      case WID_TD_LIST: {
        Dimension d = GetStringBoundingBox(STR_TOWN_DIRECTORY_NONE);
        uint64_t max_value = GetParamMaxDigits(8);
        for (uint i = 0; i < this->towns.size(); i++) {
          const Town *t = this->towns[i];
 
          assert(t != nullptr);
 
          d = maxdim(d, GetStringBoundingBox(GetTownString(t, max_value)));
        }
        Dimension icon_size = GetSpriteSize(SPR_TOWN_RATING_GOOD);
        d.width += icon_size.width + 2;
        d.height = std::max(d.height, icon_size.height);
        fill.height = resize.height = d.height;
        d.height *= 5;
        d.width += padding.width;
        d.height += padding.height;
        size = maxdim(size, d);
        break;
      }
      case WID_TD_WORLD_POPULATION: {
        Dimension d = GetStringBoundingBox(GetString(STR_TOWN_POPULATION, GetParamMaxDigits(10)));
        d.width += padding.width;
        d.height += padding.height;
        size = maxdim(size, d);
        break;
      }
    }
  }
 
  void OnClick([[maybe_unused]] Point pt, WidgetID widget, [[maybe_unused]] int click_count) override
  {
    switch (widget) {
      case WID_TD_SORT_ORDER: // Click on sort order button
        if (this->towns.SortType() != 2) { // A different sort than by rating.
          this->towns.ToggleSortOrder();
          this->last_sorting = this->towns.GetListing(); // Store new sorting order.
        } else {
          /* Some parts are always sorted ascending on name. */
          this->last_sorting.order = !this->last_sorting.order;
          this->towns.SetListing(this->last_sorting);
          this->towns.ForceResort();
          this->towns.Sort();
        }
        this->SetDirty();
        break;
 
      case WID_TD_SORT_CRITERIA: // Click on sort criteria dropdown
        ShowDropDownMenu(this, TownDirectoryWindow::sorter_names, this->towns.SortType(), WID_TD_SORT_CRITERIA, 0, 0);
        break;
 
      case WID_TD_LIST: { // Click on Town Matrix
        auto it = this->vscroll->GetScrolledItemFromWidget(this->towns, pt.y, this, WID_TD_LIST, WidgetDimensions::scaled.framerect.top);
        if (it == this->towns.end()) return; // click out of town bounds
 
        const Town *t = *it;
        assert(t != nullptr);
        if (_ctrl_pressed) {
          ShowExtraViewportWindow(t->xy);
        } else {
          ScrollMainWindowToTile(t->xy);
        }
        break;
      }
    }
  }
 
  void OnDropdownSelect(WidgetID widget, int index, int) override
  {
    if (widget != WID_TD_SORT_CRITERIA) return;
 
    if (this->towns.SortType() != index) {
      this->towns.SetSortType(index);
      this->last_sorting = this->towns.GetListing(); // Store new sorting order.
      this->BuildSortTownList();
    }
  }
 
  void OnPaint() override
  {
    if (this->towns.NeedRebuild()) this->BuildSortTownList();
    this->DrawWidgets();
  }
 
  const IntervalTimer<TimerWindow> rebuild_interval = {std::chrono::seconds(3), [this](auto) {
    this->BuildSortTownList();
    this->SetDirty();
  }};
 
  void OnResize() override
  {
    this->vscroll->SetCapacityFromWidget(this, WID_TD_LIST, WidgetDimensions::scaled.framerect.Vertical());
  }
 
  void OnEditboxChanged(WidgetID wid) override
  {
    if (wid == WID_TD_FILTER) {
      this->string_filter.SetFilterTerm(this->townname_editbox.text.GetText());
      this->InvalidateData(TDIWD_FORCE_REBUILD);
    }
  }
 
  void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
  {
    switch (data) {
      case TDIWD_FORCE_REBUILD:
        /* This needs to be done in command-scope to enforce rebuilding before resorting invalid data */
        this->towns.ForceRebuild();
        break;
 
      case TDIWD_POPULATION_CHANGE:
        if (this->towns.SortType() == 1) this->towns.ForceResort();
        break;
 
      default:
        this->towns.ForceResort();
    }
  }
 
  static inline HotkeyList hotkeys {"towndirectory", {
    Hotkey('F', "focus_filter_box", WID_TD_FILTER),
  }};
};
 
Listing TownDirectoryWindow::last_sorting = {false, 0};
 
const std::initializer_list<GUITownList::SortFunction * const> TownDirectoryWindow::sorter_funcs = {
  &TownNameSorter,
  &TownPopulationSorter,
  &TownRatingSorter,
};
 
static WindowDesc _town_directory_desc(
  WDP_AUTO, "list_towns", 208, 202,
  WC_TOWN_DIRECTORY, WC_NONE,
  {},
  _nested_town_directory_widgets,
  &TownDirectoryWindow::hotkeys
);
 
void ShowTownDirectory()
{
  if (BringWindowToFrontById(WC_TOWN_DIRECTORY, 0)) return;
  new TownDirectoryWindow(_town_directory_desc);
}
 
void CcFoundTown(Commands, const CommandCost &result, TileIndex tile)
{
  if (result.Failed()) return;
 
  if (_settings_client.sound.confirm) SndPlayTileFx(SND_1F_CONSTRUCTION_OTHER, tile);
  if (!_settings_client.gui.persistent_buildingtools) ResetObjectToPlace();
}
 
void CcFoundRandomTown(Commands, const CommandCost &result, Money, TownID town_id)
{
  if (result.Succeeded()) ScrollMainWindowToTile(Town::Get(town_id)->xy);
}
 
static constexpr NWidgetPart _nested_found_town_widgets[] = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_DARK_GREEN),
    NWidget(WWT_CAPTION, COLOUR_DARK_GREEN), SetStringTip(STR_FOUND_TOWN_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
    NWidget(WWT_SHADEBOX, COLOUR_DARK_GREEN),
    NWidget(WWT_STICKYBOX, COLOUR_DARK_GREEN),
  EndContainer(),
  /* Construct new town(s) buttons. */
  NWidget(WWT_PANEL, COLOUR_DARK_GREEN),
    NWidget(NWID_VERTICAL), SetPIP(0, WidgetDimensions::unscaled.vsep_normal, 0), SetPadding(WidgetDimensions::unscaled.picker),
      NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_NEW_TOWN), SetStringTip(STR_FOUND_TOWN_NEW_TOWN_BUTTON, STR_FOUND_TOWN_NEW_TOWN_TOOLTIP), SetFill(1, 0),
      NWidget(NWID_SELECTION, INVALID_COLOUR, WID_TF_TOWN_ACTION_SEL),
        NWidget(NWID_VERTICAL), SetPIP(0, WidgetDimensions::unscaled.vsep_normal, 0),
          NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_TF_RANDOM_TOWN), SetStringTip(STR_FOUND_TOWN_RANDOM_TOWN_BUTTON, STR_FOUND_TOWN_RANDOM_TOWN_TOOLTIP), SetFill(1, 0),
          NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_TF_MANY_RANDOM_TOWNS), SetStringTip(STR_FOUND_TOWN_MANY_RANDOM_TOWNS, STR_FOUND_TOWN_RANDOM_TOWNS_TOOLTIP), SetFill(1, 0),
          NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_TF_LOAD_FROM_FILE), SetStringTip(STR_FOUND_TOWN_LOAD_FROM_FILE, STR_FOUND_TOWN_LOAD_FROM_FILE_TOOLTIP), SetFill(1, 0),
        EndContainer(),
      EndContainer(),
 
      /* Town name selection. */
      NWidget(WWT_LABEL, INVALID_COLOUR), SetStringTip(STR_FOUND_TOWN_NAME_TITLE),
      NWidget(WWT_EDITBOX, COLOUR_GREY, WID_TF_TOWN_NAME_EDITBOX), SetStringTip(STR_FOUND_TOWN_NAME_EDITOR_TITLE, STR_FOUND_TOWN_NAME_EDITOR_TOOLTIP), SetFill(1, 0),
      NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_TF_TOWN_NAME_RANDOM), SetStringTip(STR_FOUND_TOWN_NAME_RANDOM_BUTTON, STR_FOUND_TOWN_NAME_RANDOM_TOOLTIP), SetFill(1, 0),
 
      /* Town size selection. */
      NWidget(WWT_LABEL, INVALID_COLOUR), SetStringTip(STR_FOUND_TOWN_INITIAL_SIZE_TITLE),
      NWidget(NWID_VERTICAL),
        NWidget(NWID_HORIZONTAL, NWidContainerFlag::EqualSize),
          NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_SIZE_SMALL), SetStringTip(STR_FOUND_TOWN_INITIAL_SIZE_SMALL_BUTTON, STR_FOUND_TOWN_INITIAL_SIZE_TOOLTIP), SetFill(1, 0),
          NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_SIZE_MEDIUM), SetStringTip(STR_FOUND_TOWN_INITIAL_SIZE_MEDIUM_BUTTON, STR_FOUND_TOWN_INITIAL_SIZE_TOOLTIP), SetFill(1, 0),
        EndContainer(),
        NWidget(NWID_HORIZONTAL, NWidContainerFlag::EqualSize),
          NWidget(NWID_SELECTION, INVALID_COLOUR, WID_TF_SIZE_SEL),
            NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_SIZE_LARGE), SetStringTip(STR_FOUND_TOWN_INITIAL_SIZE_LARGE_BUTTON, STR_FOUND_TOWN_INITIAL_SIZE_TOOLTIP), SetFill(1, 0),
          EndContainer(),
          NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_SIZE_RANDOM), SetStringTip(STR_FOUND_TOWN_SIZE_RANDOM, STR_FOUND_TOWN_INITIAL_SIZE_TOOLTIP), SetFill(1, 0),
        EndContainer(),
      EndContainer(),
      NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_CITY), SetStringTip(STR_FOUND_TOWN_CITY, STR_FOUND_TOWN_CITY_TOOLTIP), SetFill(1, 0),
 
      /* Town roads selection. */
      NWidget(NWID_SELECTION, INVALID_COLOUR, WID_TF_ROAD_LAYOUT_SEL),
        NWidget(NWID_VERTICAL), SetPIP(0, WidgetDimensions::unscaled.vsep_normal, 0),
          NWidget(WWT_LABEL, INVALID_COLOUR), SetStringTip(STR_FOUND_TOWN_ROAD_LAYOUT),
          NWidget(NWID_VERTICAL),
            NWidget(NWID_HORIZONTAL, NWidContainerFlag::EqualSize),
              NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_LAYOUT_ORIGINAL), SetStringTip(STR_FOUND_TOWN_SELECT_LAYOUT_ORIGINAL, STR_FOUND_TOWN_SELECT_LAYOUT_TOOLTIP), SetFill(1, 0),
              NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_LAYOUT_BETTER), SetStringTip(STR_FOUND_TOWN_SELECT_LAYOUT_BETTER_ROADS, STR_FOUND_TOWN_SELECT_LAYOUT_TOOLTIP), SetFill(1, 0),
            EndContainer(),
            NWidget(NWID_HORIZONTAL, NWidContainerFlag::EqualSize),
              NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_LAYOUT_GRID2), SetStringTip(STR_FOUND_TOWN_SELECT_LAYOUT_2X2_GRID, STR_FOUND_TOWN_SELECT_LAYOUT_TOOLTIP), SetFill(1, 0),
              NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_LAYOUT_GRID3), SetStringTip(STR_FOUND_TOWN_SELECT_LAYOUT_3X3_GRID, STR_FOUND_TOWN_SELECT_LAYOUT_TOOLTIP), SetFill(1, 0),
            EndContainer(),
            NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_LAYOUT_RANDOM), SetStringTip(STR_FOUND_TOWN_SELECT_LAYOUT_RANDOM, STR_FOUND_TOWN_SELECT_LAYOUT_TOOLTIP), SetFill(1, 0),
          EndContainer(),
        EndContainer(),
      EndContainer(),
 
      /* Town expansion selection. */
      NWidget(NWID_SELECTION, INVALID_COLOUR, WID_TF_TOWN_EXPAND_SEL),
        NWidget(NWID_VERTICAL), SetPIP(0, WidgetDimensions::unscaled.vsep_normal, 0),
          NWidget(WWT_LABEL, INVALID_COLOUR), SetStringTip(STR_FOUND_TOWN_EXPAND_MODE),
          NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_TF_EXPAND_ALL_TOWNS), SetStringTip(STR_FOUND_TOWN_EXPAND_ALL_TOWNS, STR_FOUND_TOWN_EXPAND_ALL_TOWNS_TOOLTIP), SetFill(1, 0),
          NWidget(NWID_HORIZONTAL, NWidContainerFlag::EqualSize),
            NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_EXPAND_BUILDINGS), SetStringTip(STR_FOUND_TOWN_EXPAND_BUILDINGS, STR_FOUND_TOWN_EXPAND_BUILDINGS_TOOLTIP), SetFill(1, 0),
            NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_EXPAND_ROADS), SetStringTip(STR_FOUND_TOWN_EXPAND_ROADS, STR_FOUND_TOWN_EXPAND_ROADS_TOOLTIP), SetFill(1, 0),
          EndContainer(),
        EndContainer(),
      EndContainer(),
    EndContainer(),
  EndContainer(),
};
 
struct FoundTownWindow : Window {
private:
  TownSize town_size = TSZ_MEDIUM; 
  TownLayout town_layout{}; 
  bool city = false; 
  QueryString townname_editbox; 
  bool townnamevalid = false; 
  uint32_t townnameparts = 0; 
  TownNameParams params; 
  static inline TownExpandModes expand_modes{TownExpandMode::Buildings, TownExpandMode::Roads};
 
public:
  FoundTownWindow(WindowDesc &desc, WindowNumber window_number) :
      Window(desc),
      town_layout(_settings_game.economy.town_layout),
      townname_editbox(MAX_LENGTH_TOWN_NAME_CHARS * MAX_CHAR_LENGTH, MAX_LENGTH_TOWN_NAME_CHARS),
      params(_settings_game.game_creation.town_name)
  {
    this->InitNested(window_number);
    this->querystrings[WID_TF_TOWN_NAME_EDITBOX] = &this->townname_editbox;
    this->RandomTownName();
    this->UpdateButtons(true);
  }
 
  void OnInit() override
  {
    if (_game_mode == GM_EDITOR) return;
 
    this->GetWidget<NWidgetStacked>(WID_TF_TOWN_ACTION_SEL)->SetDisplayedPlane(SZSP_HORIZONTAL);
    this->GetWidget<NWidgetStacked>(WID_TF_TOWN_EXPAND_SEL)->SetDisplayedPlane(SZSP_HORIZONTAL);
    this->GetWidget<NWidgetStacked>(WID_TF_SIZE_SEL)->SetDisplayedPlane(SZSP_VERTICAL);
    if (_settings_game.economy.found_town != TF_CUSTOM_LAYOUT) {
      this->GetWidget<NWidgetStacked>(WID_TF_ROAD_LAYOUT_SEL)->SetDisplayedPlane(SZSP_HORIZONTAL);
    } else {
      this->GetWidget<NWidgetStacked>(WID_TF_ROAD_LAYOUT_SEL)->SetDisplayedPlane(0);
    }
  }
 
  void RandomTownName()
  {
    this->townnamevalid = GenerateTownName(_interactive_random, &this->townnameparts);
 
    if (!this->townnamevalid) {
      this->townname_editbox.text.DeleteAll();
    } else {
      this->townname_editbox.text.Assign(GetTownName(&this->params, this->townnameparts));
    }
    UpdateOSKOriginalText(this, WID_TF_TOWN_NAME_EDITBOX);
 
    this->SetWidgetDirty(WID_TF_TOWN_NAME_EDITBOX);
  }
 
  void UpdateButtons(bool check_availability)
  {
    if (check_availability && _game_mode != GM_EDITOR) {
      if (_settings_game.economy.found_town != TF_CUSTOM_LAYOUT) this->town_layout = _settings_game.economy.town_layout;
      this->ReInit();
    }
 
    for (WidgetID i = WID_TF_SIZE_SMALL; i <= WID_TF_SIZE_RANDOM; i++) {
      this->SetWidgetLoweredState(i, i == WID_TF_SIZE_SMALL + this->town_size);
    }
 
    this->SetWidgetLoweredState(WID_TF_CITY, this->city);
 
    for (WidgetID i = WID_TF_LAYOUT_ORIGINAL; i <= WID_TF_LAYOUT_RANDOM; i++) {
      this->SetWidgetLoweredState(i, i == WID_TF_LAYOUT_ORIGINAL + this->town_layout);
    }
 
    this->SetWidgetLoweredState(WID_TF_EXPAND_BUILDINGS, FoundTownWindow::expand_modes.Test(TownExpandMode::Buildings));
    this->SetWidgetLoweredState(WID_TF_EXPAND_ROADS, FoundTownWindow::expand_modes.Test(TownExpandMode::Roads));
 
    this->SetDirty();
  }
 
  template <typename Tcallback>
  void ExecuteFoundTownCommand(TileIndex tile, bool random, StringID errstr, Tcallback cc)
  {
    std::string name;
 
    if (!this->townnamevalid) {
      name = this->townname_editbox.text.GetText();
    } else {
      /* If user changed the name, send it */
      std::string original_name = GetTownName(&this->params, this->townnameparts);
      if (original_name != this->townname_editbox.text.GetText()) name = this->townname_editbox.text.GetText();
    }
 
    bool success = Command<CMD_FOUND_TOWN>::Post(errstr, cc,
        tile, this->town_size, this->city, this->town_layout, random, townnameparts, name);
 
    /* Rerandomise name, if success and no cost-estimation. */
    if (success && !_shift_pressed) this->RandomTownName();
  }
 
  void OnClick([[maybe_unused]] Point pt, WidgetID widget, [[maybe_unused]] int click_count) override
  {
    switch (widget) {
      case WID_TF_NEW_TOWN:
        HandlePlacePushButton(this, WID_TF_NEW_TOWN, SPR_CURSOR_TOWN, HT_RECT);
        break;
 
      case WID_TF_RANDOM_TOWN:
        this->ExecuteFoundTownCommand(TileIndex{}, true, STR_ERROR_CAN_T_GENERATE_TOWN, CcFoundRandomTown);
        break;
 
      case WID_TF_TOWN_NAME_RANDOM:
        this->RandomTownName();
        this->SetFocusedWidget(WID_TF_TOWN_NAME_EDITBOX);
        break;
 
      case WID_TF_MANY_RANDOM_TOWNS: {
        std::string default_town_number = fmt::format("{}", GetDefaultTownsForMapSize());
        ShowQueryString(default_town_number, STR_MAPGEN_NUMBER_OF_TOWNS, 5, this, CS_NUMERAL, {QueryStringFlag::AcceptUnchanged});
        break;
      }
      case WID_TF_LOAD_FROM_FILE:
        ShowSaveLoadDialog(FT_TOWN_DATA, SLO_LOAD);
        break;
 
      case WID_TF_EXPAND_ALL_TOWNS:
        for (Town *t : Town::Iterate()) {
          Command<CMD_EXPAND_TOWN>::Do(DoCommandFlag::Execute, t->index, 0, FoundTownWindow::expand_modes);
        }
        break;
 
      case WID_TF_SIZE_SMALL: case WID_TF_SIZE_MEDIUM: case WID_TF_SIZE_LARGE: case WID_TF_SIZE_RANDOM:
        this->town_size = (TownSize)(widget - WID_TF_SIZE_SMALL);
        this->UpdateButtons(false);
        break;
 
      case WID_TF_CITY:
        this->city ^= true;
        this->SetWidgetLoweredState(WID_TF_CITY, this->city);
        this->SetDirty();
        break;
 
      case WID_TF_EXPAND_BUILDINGS:
        FoundTownWindow::expand_modes.Flip(TownExpandMode::Buildings);
        this->UpdateButtons(false);
        break;
 
      case WID_TF_EXPAND_ROADS:
        FoundTownWindow::expand_modes.Flip(TownExpandMode::Roads);
        this->UpdateButtons(false);
        break;
 
      case WID_TF_LAYOUT_ORIGINAL: case WID_TF_LAYOUT_BETTER: case WID_TF_LAYOUT_GRID2:
      case WID_TF_LAYOUT_GRID3: case WID_TF_LAYOUT_RANDOM:
        this->town_layout = (TownLayout)(widget - WID_TF_LAYOUT_ORIGINAL);
 
        /* If we are in the editor, sync the settings of the current game to the chosen layout,
         * so that importing towns from file uses the selected layout. */
        if (_game_mode == GM_EDITOR) _settings_game.economy.town_layout = this->town_layout;
 
        this->UpdateButtons(false);
        break;
    }
  }
 
  void OnQueryTextFinished(std::optional<std::string> str) override
  {
    /* Was 'cancel' pressed? */
    if (!str.has_value()) return;
 
    auto value = ParseInteger(*str, 10, true);
    if (!value.has_value()) return;
 
    Backup<bool> old_generating_world(_generating_world, true);
    UpdateNearestTownForRoadTiles(true);
    if (!GenerateTowns(this->town_layout, value)) {
      ShowErrorMessage(GetEncodedString(STR_ERROR_CAN_T_GENERATE_TOWN), GetEncodedString(STR_ERROR_NO_SPACE_FOR_TOWN), WL_INFO);
    }
    UpdateNearestTownForRoadTiles(false);
    old_generating_world.Restore();
  }
 
  void OnPlaceObject([[maybe_unused]] Point pt, TileIndex tile) override
  {
    this->ExecuteFoundTownCommand(tile, false, STR_ERROR_CAN_T_FOUND_TOWN_HERE, CcFoundTown);
  }
 
  void OnPlaceObjectAbort() override
  {
    this->RaiseButtons();
    this->UpdateButtons(false);
  }
 
  void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
  {
    if (!gui_scope) return;
    this->UpdateButtons(true);
  }
};
 
static WindowDesc _found_town_desc(
  WDP_AUTO, "build_town", 160, 162,
  WC_FOUND_TOWN, WC_NONE,
  WindowDefaultFlag::Construction,
  _nested_found_town_widgets
);
 
void ShowFoundTownWindow()
{
  if (_game_mode != GM_EDITOR && !Company::IsValidID(_local_company)) return;
  AllocateWindowDescFront<FoundTownWindow>(_found_town_desc, 0);
}
 
void InitializeTownGui()
{
  _town_local_authority_kdtree.Clear();
}
 
void DrawHouseInGUI(int x, int y, HouseID house_id, int view)
{
  auto draw = [](int x, int y, HouseID house_id, int view) {
    if (house_id >= NEW_HOUSE_OFFSET) {
      /* Houses don't necessarily need new graphics. If they don't have a
       * spritegroup associated with them, then the sprite for the substitute
       * house id is drawn instead. */
      const HouseSpec *spec = HouseSpec::Get(house_id);
      if (spec->grf_prop.HasSpriteGroups()) {
        DrawNewHouseTileInGUI(x, y, spec, house_id, view);
        return;
      } else {
        house_id = HouseSpec::Get(house_id)->grf_prop.subst_id;
      }
    }
 
    /* Retrieve data from the draw town tile struct */
    const DrawBuildingsTileStruct &dcts = GetTownDrawTileData()[house_id << 4 | view << 2 | TOWN_HOUSE_COMPLETED];
    DrawSprite(dcts.ground.sprite, dcts.ground.pal, x, y);
 
    /* Add a house on top of the ground? */
    if (dcts.building.sprite != 0) {
      Point pt = RemapCoords(dcts.origin.x, dcts.origin.y, dcts.origin.z);
      DrawSprite(dcts.building.sprite, dcts.building.pal, x + UnScaleGUI(pt.x), y + UnScaleGUI(pt.y));
    }
  };
 
  /* Houses can have 1x1, 1x2, 2x1 and 2x2 layouts which are individual HouseIDs. For the GUI we need
   * draw all of the tiles with appropriate positions. */
  int x_delta = ScaleSpriteTrad(TILE_PIXELS);
  int y_delta = ScaleSpriteTrad(TILE_PIXELS / 2);
 
  const HouseSpec *hs = HouseSpec::Get(house_id);
  if (hs->building_flags.Test(BuildingFlag::Size2x2)) {
    draw(x, y - y_delta - y_delta, house_id, view); // North corner.
    draw(x + x_delta, y - y_delta, house_id + 1, view); // West corner.
    draw(x - x_delta, y - y_delta, house_id + 2, view); // East corner.
    draw(x, y, house_id + 3, view); // South corner.
  } else if (hs->building_flags.Test(BuildingFlag::Size2x1)) {
    draw(x + x_delta / 2, y - y_delta, house_id, view); // North east tile.
    draw(x - x_delta / 2, y, house_id + 1, view); // South west tile.
  } else if (hs->building_flags.Test(BuildingFlag::Size1x2)) {
    draw(x - x_delta / 2, y - y_delta, house_id, view); // North west tile.
    draw(x + x_delta / 2, y, house_id + 1, view); // South east tile.
  } else {
    draw(x, y, house_id, view);
  }
}
 
static StringID GetHouseName(const HouseSpec *hs)
{
  std::array<int32_t, 1> regs100;
  uint16_t callback_res = GetHouseCallback(CBID_HOUSE_CUSTOM_NAME, 1, 0, hs->Index(), nullptr, INVALID_TILE, regs100, true);
  if (callback_res != CALLBACK_FAILED && callback_res != 0x400) {
    StringID new_name = STR_NULL;
    if (callback_res == 0x40F) {
      new_name = GetGRFStringID(hs->grf_prop.grffile->grfid, static_cast<GRFStringID>(regs100[0]));
    } else if (callback_res > 0x400) {
      ErrorUnknownCallbackResult(hs->grf_prop.grffile->grfid, CBID_HOUSE_CUSTOM_NAME, callback_res);
    } else {
      new_name = GetGRFStringID(hs->grf_prop.grffile->grfid, GRFSTR_MISC_GRF_TEXT + callback_res);
    }
    if (new_name != STR_NULL && new_name != STR_UNDEFINED) {
      return new_name;
    }
  }
 
  return hs->building_name;
}
 
class HousePickerCallbacks : public PickerCallbacks {
public:
  HousePickerCallbacks() : PickerCallbacks("fav_houses") {}
 
  void SetClimateMask()
  {
    this->climate_mask = GetClimateMaskForLandscape();
 
    /* In some cases, not all 'classes' (house zones) have distinct houses, so we need to disable those.
     * As we need to check all types, and this cannot change with the picker window open, pre-calculate it.
     * This loop calls GetTypeName() instead of directly checking properties so that there is no discrepancy. */
    this->class_mask = 0;
 
    int num_classes = this->GetClassCount();
    for (int cls_id = 0; cls_id < num_classes; ++cls_id) {
      int num_types = this->GetTypeCount(cls_id);
      for (int id = 0; id < num_types; ++id) {
        if (this->GetTypeName(cls_id, id) != INVALID_STRING_ID) {
          SetBit(this->class_mask, cls_id);
          break;
        }
      }
    }
  }
 
  HouseZones climate_mask{};
  uint8_t class_mask = 0; 
 
  static inline int sel_class; 
  static inline int sel_type; 
  static inline int sel_view; 
 
  /* Houses do not have classes like NewGRFClass. We'll make up fake classes based on town zone
   * availability instead. */
  static inline const std::array<StringID, NUM_HOUSE_ZONES> zone_names = {
    STR_HOUSE_PICKER_CLASS_ZONE1,
    STR_HOUSE_PICKER_CLASS_ZONE2,
    STR_HOUSE_PICKER_CLASS_ZONE3,
    STR_HOUSE_PICKER_CLASS_ZONE4,
    STR_HOUSE_PICKER_CLASS_ZONE5,
  };
 
  GrfSpecFeature GetFeature() const override { return GSF_HOUSES; }
 
  StringID GetClassTooltip() const override { return STR_PICKER_HOUSE_CLASS_TOOLTIP; }
  StringID GetTypeTooltip() const override { return STR_PICKER_HOUSE_TYPE_TOOLTIP; }
  bool IsActive() const override { return true; }
 
  bool HasClassChoice() const override { return true; }
  int GetClassCount() const override { return static_cast<int>(zone_names.size()); }
 
  void Close([[maybe_unused]] int data) override { ResetObjectToPlace(); }
 
  int GetSelectedClass() const override { return HousePickerCallbacks::sel_class; }
  void SetSelectedClass(int cls_id) const override { HousePickerCallbacks::sel_class = cls_id; }
 
  StringID GetClassName(int id) const override
  {
    if (id >= GetClassCount()) return INVALID_STRING_ID;
    if (!HasBit(this->class_mask, id)) return INVALID_STRING_ID;
    return zone_names[id];
  }
 
  int GetTypeCount(int cls_id) const override
  {
    if (cls_id < GetClassCount()) return static_cast<int>(HouseSpec::Specs().size());
    return 0;
  }
 
  PickerItem GetPickerItem(int cls_id, int id) const override
  {
    const auto *spec = HouseSpec::Get(id);
    if (!spec->grf_prop.HasGrfFile()) return {0, spec->Index(), cls_id, id};
    return {spec->grf_prop.grfid, spec->grf_prop.local_id, cls_id, id};
  }
 
  int GetSelectedType() const override { return sel_type; }
  void SetSelectedType(int id) const override { sel_type = id; }
 
  static HouseZone GetHouseZoneFromClassId(int cls_id) { return static_cast<HouseZone>(to_underlying(HouseZone::TownEdge) + cls_id); }
  static int GetClassIdFromHouseZone(HouseZones zones) { return FindFirstBit((zones & HZ_ZONE_ALL).base()) - to_underlying(HouseZone::TownEdge); }
 
  StringID GetTypeName(int cls_id, int id) const override
  {
    const HouseSpec *spec = HouseSpec::Get(id);
    if (spec == nullptr) return INVALID_STRING_ID;
    if (!spec->enabled) return INVALID_STRING_ID;
    if (!spec->building_availability.Any(climate_mask)) return INVALID_STRING_ID;
    if (!spec->building_availability.Test(GetHouseZoneFromClassId(cls_id))) return INVALID_STRING_ID;
    for (int i = 0; i < cls_id; i++) {
      /* Don't include if it's already included in an earlier zone. */
      if (spec->building_availability.Test(GetHouseZoneFromClassId(i))) return INVALID_STRING_ID;
    }
 
    return GetHouseName(spec);
  }
 
  std::span<const BadgeID> GetTypeBadges(int cls_id, int id) const override
  {
    const auto *spec = HouseSpec::Get(id);
    if (spec == nullptr) return {};
    if (!spec->enabled) return {};
    if (!spec->building_availability.Any(climate_mask)) return {};
    if (!spec->building_availability.Test(GetHouseZoneFromClassId(cls_id))) return {};
    for (int i = 0; i < cls_id; i++) {
      /* Don't include if it's already included in an earlier zone. */
      if (spec->building_availability.Test(GetHouseZoneFromClassId(i))) return {};
    }
 
    return spec->badges;
  }
 
  bool IsTypeAvailable(int, int id) const override
  {
    const HouseSpec *hs = HouseSpec::Get(id);
    return hs->enabled;
  }
 
  void DrawType(int x, int y, int, int id) const override
  {
    DrawHouseInGUI(x, y, id, HousePickerCallbacks::sel_view);
  }
 
  void FillUsedItems(std::set<PickerItem> &items) override
  {
    auto id_count = GetBuildingHouseIDCounts();
    for (auto it = id_count.begin(); it != id_count.end(); ++it) {
      if (*it == 0) continue;
      HouseID house = static_cast<HouseID>(std::distance(id_count.begin(), it));
      const HouseSpec *hs = HouseSpec::Get(house);
      int class_index = GetClassIdFromHouseZone(hs->building_availability);
      items.insert({0, house, class_index, house});
    }
  }
 
  std::set<PickerItem> UpdateSavedItems(const std::set<PickerItem> &src) override
  {
    if (src.empty()) return src;
 
    const auto &specs = HouseSpec::Specs();
    std::set<PickerItem> dst;
    for (const auto &item : src) {
      if (item.grfid == 0) {
        dst.insert(item);
      } else {
        /* Search for spec by grfid and local index. */
        auto it = std::ranges::find_if(specs, [&item](const HouseSpec &spec) { return spec.grf_prop.grfid == item.grfid && spec.grf_prop.local_id == item.local_id; });
        if (it == specs.end()) {
          /* Not preset, hide from UI. */
          dst.insert({item.grfid, item.local_id, -1, -1});
        } else {
          int class_index = GetClassIdFromHouseZone(it->building_availability);
          dst.insert( {item.grfid, item.local_id, class_index, it->Index()});
        }
      }
    }
 
    return dst;
  }
 
  static HousePickerCallbacks instance;
};
/* static */ HousePickerCallbacks HousePickerCallbacks::instance;
 
static CargoTypes GetProducedCargoOfHouse(const HouseSpec *hs)
{
  CargoTypes produced{};
  if (hs->callback_mask.Test(HouseCallbackMask::ProduceCargo)) {
    for (uint i = 0; i < 256; i++) {
      uint16_t callback = GetHouseCallback(CBID_HOUSE_PRODUCE_CARGO, i, 0, hs->Index(), nullptr, INVALID_TILE, {}, true);
 
      if (callback == CALLBACK_FAILED || callback == CALLBACK_HOUSEPRODCARGO_END) break;
 
      CargoType cargo = GetCargoTranslation(GB(callback, 8, 7), hs->grf_prop.grffile);
      if (!IsValidCargoType(cargo)) continue;
 
      uint amt = GB(callback, 0, 8);
      if (amt == 0) continue;
 
      SetBit(produced, cargo);
    }
  } else {
    /* Cargo is not controlled by NewGRF, town production effect is used instead. */
    for (const CargoSpec *cs : CargoSpec::town_production_cargoes[TPE_PASSENGERS]) SetBit(produced, cs->Index());
    for (const CargoSpec *cs : CargoSpec::town_production_cargoes[TPE_MAIL]) SetBit(produced, cs->Index());
  }
  return produced;
}
 
struct BuildHouseWindow : public PickerWindow {
  std::string house_info{};
  static inline bool house_protected;
 
  BuildHouseWindow(WindowDesc &desc, Window *parent) : PickerWindow(desc, parent, 0, HousePickerCallbacks::instance)
  {
    HousePickerCallbacks::instance.SetClimateMask();
    this->ConstructWindow();
  }
 
  void UpdateSelectSize(const HouseSpec *spec)
  {
    if (spec == nullptr) {
      SetTileSelectSize(1, 1);
      ResetObjectToPlace();
    } else {
      SetObjectToPlaceWnd(SPR_CURSOR_TOWN, PAL_NONE, HT_RECT | HT_DIAGONAL, this);
      if (spec->building_flags.Test(BuildingFlag::Size2x2)) {
        SetTileSelectSize(2, 2);
      } else if (spec->building_flags.Test(BuildingFlag::Size2x1)) {
        SetTileSelectSize(2, 1);
      } else if (spec->building_flags.Test(BuildingFlag::Size1x2)) {
        SetTileSelectSize(1, 2);
      } else if (spec->building_flags.Test(BuildingFlag::Size1x1)) {
        SetTileSelectSize(1, 1);
      }
    }
  }
 
  static std::string GetHouseYear(TimerGameCalendar::Year min_year, TimerGameCalendar::Year max_year)
  {
    if (min_year == CalendarTime::MIN_YEAR) {
      if (max_year == CalendarTime::MAX_YEAR) {
        return GetString(STR_HOUSE_PICKER_YEARS_ANY);
      }
      return GetString(STR_HOUSE_PICKER_YEARS_UNTIL, max_year);
    }
    if (max_year == CalendarTime::MAX_YEAR) {
      return GetString(STR_HOUSE_PICKER_YEARS_FROM, min_year);
    }
    return GetString(STR_HOUSE_PICKER_YEARS, min_year, max_year);
  }
 
  static std::string GetHouseInformation(const HouseSpec *hs)
  {
    std::stringstream line;
 
    line << GetString(STR_HOUSE_PICKER_NAME, GetHouseName(hs));
    line << "\n";
 
    line << GetString(STR_HOUSE_PICKER_POPULATION, hs->population);
    line << "\n";
 
    line << GetHouseYear(hs->min_year, hs->max_year);
    line << "\n";
 
    uint8_t size = 0;
    if (hs->building_flags.Test(BuildingFlag::Size1x1)) size = 0x11;
    if (hs->building_flags.Test(BuildingFlag::Size2x1)) size = 0x21;
    if (hs->building_flags.Test(BuildingFlag::Size1x2)) size = 0x12;
    if (hs->building_flags.Test(BuildingFlag::Size2x2)) size = 0x22;
    line << GetString(STR_HOUSE_PICKER_SIZE, GB(size, 0, 4), GB(size, 4, 4));
 
    auto cargo_string = BuildCargoAcceptanceString(GetAcceptedCargoOfHouse(hs), STR_HOUSE_PICKER_CARGO_ACCEPTED);
    if (cargo_string.has_value()) {
      line << "\n";
      line << *cargo_string;
    }
 
    CargoTypes produced = GetProducedCargoOfHouse(hs);
    if (produced != 0) {
      line << "\n";
      line << GetString(STR_HOUSE_PICKER_CARGO_PRODUCED, produced);
    }
 
    return line.str();
  }
 
  void OnInit() override
  {
    this->InvalidateData(PICKER_INVALIDATION_ALL);
    this->PickerWindow::OnInit();
  }
 
  void DrawWidget(const Rect &r, WidgetID widget) const override
  {
    if (widget == WID_BH_INFO) {
      if (!this->house_info.empty()) DrawStringMultiLine(r, this->house_info);
    } else {
      this->PickerWindow::DrawWidget(r, widget);
    }
  }
 
  void OnClick([[maybe_unused]] Point pt, WidgetID widget, [[maybe_unused]] int click_count) override
  {
    switch (widget) {
      case WID_BH_PROTECT_OFF:
      case WID_BH_PROTECT_ON:
        BuildHouseWindow::house_protected = (widget == WID_BH_PROTECT_ON);
        this->SetWidgetLoweredState(WID_BH_PROTECT_OFF, !BuildHouseWindow::house_protected);
        this->SetWidgetLoweredState(WID_BH_PROTECT_ON, BuildHouseWindow::house_protected);
 
        SndClickBeep();
        this->SetDirty();
        break;
 
      default:
        this->PickerWindow::OnClick(pt, widget, click_count);
        break;
    }
  }
 
  void OnInvalidateData(int data = 0, bool gui_scope = true) override
  {
    this->PickerWindow::OnInvalidateData(data, gui_scope);
    if (!gui_scope) return;
 
    const HouseSpec *spec = HouseSpec::Get(HousePickerCallbacks::sel_type);
 
    PickerInvalidations pi(data);
    if (pi.Test(PickerInvalidation::Position)) {
      UpdateSelectSize(spec);
      this->house_info = GetHouseInformation(spec);
    }
 
    /* If house spec already has the protected flag, handle it automatically and disable the buttons. */
    bool hasflag = spec->extra_flags.Test(HouseExtraFlag::BuildingIsProtected);
    if (hasflag) BuildHouseWindow::house_protected = true;
 
    this->SetWidgetLoweredState(WID_BH_PROTECT_OFF, !BuildHouseWindow::house_protected);
    this->SetWidgetLoweredState(WID_BH_PROTECT_ON, BuildHouseWindow::house_protected);
 
    this->SetWidgetDisabledState(WID_BH_PROTECT_OFF, hasflag);
    this->SetWidgetDisabledState(WID_BH_PROTECT_ON, hasflag);
  }
 
  void OnPlaceObject([[maybe_unused]] Point pt, TileIndex tile) override
  {
    const HouseSpec *spec = HouseSpec::Get(HousePickerCallbacks::sel_type);
    Command<CMD_PLACE_HOUSE>::Post(STR_ERROR_CAN_T_BUILD_HOUSE, CcPlaySound_CONSTRUCTION_OTHER, tile, spec->Index(), BuildHouseWindow::house_protected);
  }
 
  const IntervalTimer<TimerWindow> view_refresh_interval = {std::chrono::milliseconds(2500), [this](auto) {
    /* There are four different 'views' that are random based on house tile position. As this is not
     * user-controllable, instead we automatically cycle through them. */
    HousePickerCallbacks::sel_view = (HousePickerCallbacks::sel_view + 1) % 4;
    this->SetDirty();
  }};
 
  static inline HotkeyList hotkeys{"buildhouse", {
    Hotkey('F', "focus_filter_box", PCWHK_FOCUS_FILTER_BOX),
  }};
};
 
static constexpr NWidgetPart _nested_build_house_widgets[] = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_DARK_GREEN),
    NWidget(WWT_CAPTION, COLOUR_DARK_GREEN), SetStringTip(STR_HOUSE_PICKER_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
    NWidget(WWT_SHADEBOX, COLOUR_DARK_GREEN),
    NWidget(WWT_DEFSIZEBOX, COLOUR_DARK_GREEN),
    NWidget(WWT_STICKYBOX, COLOUR_DARK_GREEN),
  EndContainer(),
  NWidget(NWID_HORIZONTAL),
    NWidget(NWID_VERTICAL),
      NWidgetFunction(MakePickerClassWidgets),
      NWidget(WWT_PANEL, COLOUR_DARK_GREEN),
        NWidget(NWID_VERTICAL), SetPIP(0, WidgetDimensions::unscaled.vsep_picker, 0), SetPadding(WidgetDimensions::unscaled.picker),
          NWidget(WWT_EMPTY, INVALID_COLOUR, WID_BH_INFO), SetFill(1, 1), SetMinimalTextLines(10, 0),
          NWidget(WWT_LABEL, INVALID_COLOUR), SetStringTip(STR_HOUSE_PICKER_PROTECT_TITLE, STR_NULL), SetFill(1, 0),
          NWidget(NWID_HORIZONTAL), SetPIPRatio(1, 0, 1),
            NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_BH_PROTECT_OFF), SetMinimalSize(60, 12), SetStringTip(STR_HOUSE_PICKER_PROTECT_OFF, STR_HOUSE_PICKER_PROTECT_TOOLTIP),
            NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_BH_PROTECT_ON), SetMinimalSize(60, 12), SetStringTip(STR_HOUSE_PICKER_PROTECT_ON, STR_HOUSE_PICKER_PROTECT_TOOLTIP),
          EndContainer(),
        EndContainer(),
      EndContainer(),
 
    EndContainer(),
    NWidgetFunction(MakePickerTypeWidgets),
  EndContainer(),
};
 
static WindowDesc _build_house_desc(
  WDP_AUTO, "build_house", 0, 0,
  WC_BUILD_HOUSE, WC_BUILD_TOOLBAR,
  WindowDefaultFlag::Construction,
  _nested_build_house_widgets,
  &BuildHouseWindow::hotkeys
);
 
void ShowBuildHousePicker(Window *parent)
{
  if (BringWindowToFrontById(WC_BUILD_HOUSE, 0)) return;
  new BuildHouseWindow(_build_house_desc, parent);
}