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_house.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 "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 "widgets/town_widget.h"
 
#include "table/strings.h"
 
#include "safeguards.h"
 
TownKdtree _town_local_authority_kdtree(&Kdtree_TownXYFunc);
 
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), SetDataTip(STR_LOCAL_AUTHORITY_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
    NWidget(WWT_TEXTBTN, COLOUR_BROWN, WID_TA_ZONE_BUTTON), SetMinimalSize(50, 0), SetDataTip(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), SetDataTip(0x0, 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), SetDataTip(STR_LOCAL_AUTHORITY_DO_IT_BUTTON, STR_LOCAL_AUTHORITY_DO_IT_TOOLTIP),
    NWidget(WWT_RESIZEBOX, COLOUR_BROWN),
  EndContainer()
};
 
struct TownAuthorityWindow : Window {
private:
  Town *town;    
  int sel_index; 
  uint displayed_actions_on_previous_painting; 
  TownActions enabled_actions; 
  TownActions available_actions; 
  StringID action_tooltips[TACT_COUNT];
 
  Dimension icon_size;      
  Dimension exclusive_size; 
 
  int GetNthSetBit(int n)
  {
    if (n >= 0) {
      for (uint i : SetBitIterator(this->enabled_actions)) {
        n--;
        if (n < 0) return i;
      }
    }
    return -1;
  }
 
  static TownActions GetEnabledActions()
  {
    TownActions enabled = TACT_ALL;
 
    if (!_settings_game.economy.fund_roads) CLRBITS(enabled, TACT_ROAD_REBUILD);
    if (!_settings_game.economy.fund_buildings) CLRBITS(enabled, TACT_FUND_BUILDINGS);
    if (!_settings_game.economy.exclusive_rights) CLRBITS(enabled, TACT_BUY_RIGHTS);
    if (!_settings_game.economy.bribe) CLRBITS(enabled, TACT_BRIBE);
 
    return enabled;
  }
 
public:
  TownAuthorityWindow(WindowDesc &desc, WindowNumber window_number) : Window(desc), sel_index(-1), displayed_actions_on_previous_painting(0), available_actions(TACT_NONE)
  {
    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_index == -1) || !HasBit(this->available_actions, this->sel_index));
 
    this->DrawWidgets();
    if (!this->IsShaded())
    {
      this->DrawRatings();
      this->DrawActions();
    }
  }
 
  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 ((HasBit(this->town->have_ratings, c->index) || this->town->exclusivity == c->index)) {
        DrawCompanyIcon(c->index, icon.left, text.top + icon_y_offset);
 
        SetDParam(0, c->index);
        SetDParam(1, c->index);
 
        int rating = this->town->ratings[c->index];
        StringID str = STR_CARGO_RATING_APPALLING;
        if (rating > RATING_APPALLING) str++;
        if (rating > RATING_VERYPOOR)  str++;
        if (rating > RATING_POOR)      str++;
        if (rating > RATING_MEDIOCRE)  str++;
        if (rating > RATING_GOOD)      str++;
        if (rating > RATING_VERYGOOD)  str++;
        if (rating > RATING_EXCELLENT) str++;
 
        SetDParam(2, str);
        if (this->town->exclusivity == c->index) {
          DrawSprite(SPR_EXCLUSIVE_TRANSPORT, COMPANY_SPRITE_COLOUR(c->index), exclusive.left, text.top + exclusive_y_offset);
        }
 
        DrawString(text.left, text.right, text.top + text_y_offset, STR_LOCAL_AUTHORITY_COMPANY_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 (int i = 0; i < TACT_COUNT; i++) {
      /* Don't show actions if disabled in settings. */
      if (!HasBit(this->enabled_actions, i)) continue;
 
      /* Set colour of action based on ability to execute and if selected. */
      TextColour action_colour = TC_GREY | TC_NO_SHADE;
      if (HasBit(this->available_actions, i)) action_colour = TC_ORANGE;
      if (this->sel_index == i) action_colour = TC_WHITE;
 
      DrawString(r, STR_LOCAL_AUTHORITY_ACTION_SMALL_ADVERTISING_CAMPAIGN + i, action_colour);
      r.top += GetCharacterHeight(FS_NORMAL);
    }
  }
 
  void SetStringParameters(WidgetID widget) const override
  {
    if (widget == WID_TA_CAPTION) SetDParam(0, this->window_number);
  }
 
  void DrawWidget(const Rect &r, WidgetID widget) const override
  {
    switch (widget) {
      case WID_TA_ACTION_INFO:
        if (this->sel_index != -1) {
          Money action_cost = _price[PR_TOWN_ACTION] * _town_action_costs[this->sel_index] >> 8;
          bool affordable = Company::IsValidID(_local_company) && action_cost < GetAvailableMoney(_local_company);
 
          SetDParam(0, action_cost);
          DrawStringMultiLine(r.Shrink(WidgetDimensions::scaled.framerect),
            this->action_tooltips[this->sel_index],
            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 (int i = 0; i < TACT_COUNT; i++) {
          SetDParam(0, _price[PR_TOWN_ACTION] * _town_action_costs[i] >> 8);
          d = maxdim(d, GetStringMultiLineBoundingBox(this->action_tooltips[i], size));
        }
        d.width += padding.width;
        d.height += padding.height;
        size = maxdim(size, d);
        break;
      }
 
      case WID_TA_COMMAND_LIST:
        size.height = (TACT_COUNT + 1) * GetCharacterHeight(FS_NORMAL) + padding.height;
        size.width = GetStringBoundingBox(STR_LOCAL_AUTHORITY_ACTIONS_TITLE).width;
        for (uint i = 0; i < TACT_COUNT; i++ ) {
          size.width = std::max(size.width, GetStringBoundingBox(STR_LOCAL_AUTHORITY_ACTION_SMALL_ADVERTISING_CAMPAIGN + i).width + padding.width);
        }
        size.width += padding.width;
        break;
 
      case WID_TA_RATING_INFO:
        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);
        MarkWholeScreenDirty();
        break;
      }
 
      case WID_TA_COMMAND_LIST: {
        int y = this->GetRowFromWidget(pt.y, WID_TA_COMMAND_LIST, 1, GetCharacterHeight(FS_NORMAL)) - 1;
 
        y = GetNthSetBit(y);
        if (y >= 0) {
          this->sel_index = y;
          this->SetDirty();
        }
 
        /* When double-clicking, continue */
        if (click_count == 1 || y < 0 || !HasBit(this->available_actions, y)) break;
        [[fallthrough]];
      }
 
      case WID_TA_EXECUTE:
        Command<CMD_DO_TOWN_ACTION>::Post(STR_ERROR_CAN_T_DO_THIS, this->town->xy, this->window_number, this->sel_index);
        break;
    }
  }
 
  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 (!HasBit(this->enabled_actions, this->sel_index)) {
      this->sel_index = -1;
    }
  }
};
 
static WindowDesc _town_authority_desc(
  WDP_AUTO, "view_town_authority", 317, 222,
  WC_TOWN_AUTHORITY, WC_NONE,
  0,
  _nested_town_authority_widgets
);
 
static void ShowTownAuthorityWindow(uint town)
{
  AllocateWindowDescFront<TownAuthorityWindow>(_town_authority_desc, town);
}
 
 
/* Town view window. */
struct TownViewWindow : Window {
private:
  Town *town; 
 
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);
    if (this->town->larger_town) this->GetWidget<NWidgetCore>(WID_TV_CAPTION)->widget_data = STR_TOWN_VIEW_CITY_CAPTION;
 
    this->FinishInitNested(window_number);
 
    this->flags |= WF_DISABLE_VP_SCROLL;
    NWidgetViewport *nvp = this->GetWidget<NWidgetViewport>(WID_TV_VIEWPORT);
    nvp->InitializeViewport(this, this->town->xy, ScaleZoomGUI(ZOOM_LVL_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();
  }
 
  void SetStringParameters(WidgetID widget) const override
  {
    if (widget == WID_TV_CAPTION) SetDParam(0, this->town->index);
  }
 
  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);
 
    SetDParam(0, this->town->cache.population);
    SetDParam(1, this->town->cache.num_houses);
    DrawString(tr, STR_TOWN_VIEW_POPULATION_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]) {
        CargoID cid = cs->Index();
        SetDParam(0, 1ULL << cid);
        SetDParam(1, this->town->supplied[cid].old_act);
        SetDParam(2, this->town->supplied[cid].old_max);
        DrawString(tr, str_last_period);
        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;
          }
        }
 
        SetDParam(0, 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;
        }
 
        SetDParam(0, cargo->Index());
        SetDParam(1, this->town->received[i].old_act);
        SetDParam(2, cargo->Index());
        SetDParam(3, this->town->goal[i]);
      }
      DrawString(tr.Indent(20, rtl), string);
      tr.top += GetCharacterHeight(FS_NORMAL);
    }
 
    if (HasBit(this->town->flags, TOWN_IS_GROWING)) {
      SetDParam(0, RoundDivSU(this->town->growth_rate + 1, Ticks::DAY_TICKS));
      DrawString(tr, this->town->fund_buildings_months == 0 ? STR_TOWN_VIEW_TOWN_GROWS_EVERY : STR_TOWN_VIEW_TOWN_GROWS_EVERY_FUNDED);
      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) {
      SetDParam(0, this->town->noise_reached);
      SetDParam(1, this->town->MaxTownNoise());
      DrawString(tr, STR_TOWN_VIEW_NOISE_IN_TOWN);
      tr.top += GetCharacterHeight(FS_NORMAL);
    }
 
    if (!this->town->text.empty()) {
      SetDParamStr(0, this->town->text);
      tr.top = DrawStringMultiLine(tr, STR_JUST_RAW_STRING, 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
        SetDParam(0, this->window_number);
        ShowQueryString(STR_TOWN_NAME, STR_TOWN_VIEW_RENAME_TOWN_BUTTON, MAX_LENGTH_TOWN_NAME_CHARS, this, CS_ALPHANUMERAL, QSF_ENABLE_DEFAULT | QSF_LEN_IN_CHARS);
        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, this->window_number, 0);
        break;
      }
 
      case WID_TV_DELETE: // delete town - only available on Scenario editor
        Command<CMD_DELETE_TOWN>::Post(STR_ERROR_TOWN_CAN_T_DELETE, 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()) {
      SetDParamStr(0, this->town->text);
      aimed_height += GetStringHeight(STR_JUST_RAW_STRING, 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) override
  {
    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, this->window_number, *str);
  }
 
  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), SetDataTip(SPR_RENAME, STR_TOWN_VIEW_RENAME_TOOLTIP),
    NWidget(WWT_CAPTION, COLOUR_BROWN, WID_TV_CAPTION), SetDataTip(STR_TOWN_VIEW_TOWN_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
    NWidget(WWT_PUSHIMGBTN, COLOUR_BROWN, WID_TV_CENTER_VIEW), SetAspect(WidgetDimensions::ASPECT_LOCATION), SetDataTip(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, NC_EQUALSIZE),
    NWidget(WWT_PUSHTXTBTN, COLOUR_BROWN, WID_TV_SHOW_AUTHORITY), SetMinimalSize(80, 12), SetFill(1, 1), SetResize(1, 0), SetDataTip(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), SetDataTip(STR_BUTTON_CATCHMENT, STR_TOOLTIP_CATCHMENT),
    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,
  0,
  _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), SetDataTip(SPR_RENAME, STR_TOWN_VIEW_RENAME_TOOLTIP),
    NWidget(WWT_CAPTION, COLOUR_BROWN, WID_TV_CAPTION), SetDataTip(STR_TOWN_VIEW_TOWN_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
    NWidget(WWT_PUSHIMGBTN, COLOUR_BROWN, WID_TV_CENTER_VIEW), SetAspect(WidgetDimensions::ASPECT_LOCATION), SetDataTip(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, NC_EQUALSIZE),
    NWidget(WWT_PUSHTXTBTN, COLOUR_BROWN, WID_TV_EXPAND), SetMinimalSize(80, 12), SetFill(1, 1), SetResize(1, 0), SetDataTip(STR_TOWN_VIEW_EXPAND_BUTTON, STR_TOWN_VIEW_EXPAND_TOOLTIP),
    NWidget(WWT_PUSHTXTBTN, COLOUR_BROWN, WID_TV_DELETE), SetMinimalSize(80, 12), SetFill(1, 1), SetResize(1, 0), SetDataTip(STR_TOWN_VIEW_DELETE_BUTTON, STR_TOWN_VIEW_DELETE_TOOLTIP),
    NWidget(WWT_TEXTBTN, COLOUR_BROWN, WID_TV_CATCHMENT), SetMinimalSize(40, 12), SetFill(1, 1), SetResize(1, 0), SetDataTip(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,
  0,
  _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), SetDataTip(STR_TOWN_DIRECTORY_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
    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), SetDataTip(STR_BUTTON_SORT_BY, STR_TOOLTIP_SORT_ORDER),
        NWidget(WWT_DROPDOWN, COLOUR_BROWN, WID_TD_SORT_CRITERIA), SetDataTip(STR_JUST_STRING, STR_TOOLTIP_SORT_CRITERIA),
        NWidget(WWT_EDITBOX, COLOUR_BROWN, WID_TD_FILTER), SetFill(1, 0), SetResize(1, 0), SetDataTip(STR_LIST_FILTER_OSKTITLE, STR_LIST_FILTER_TOOLTIP),
      EndContainer(),
      NWidget(WWT_PANEL, COLOUR_BROWN, WID_TD_LIST), SetDataTip(0x0, STR_TOWN_DIRECTORY_LIST_TOOLTIP),
              SetFill(1, 0), SetResize(1, 1), SetScrollbar(WID_TD_SCROLLBAR), EndContainer(),
      NWidget(WWT_PANEL, COLOUR_BROWN),
        NWidget(WWT_TEXT, COLOUR_BROWN, WID_TD_WORLD_POPULATION), SetPadding(2, 0, 2, 2), SetFill(1, 0), SetResize(1, 0), SetDataTip(STR_TOWN_POPULATION, STR_NULL),
      EndContainer(),
    EndContainer(),
    NWidget(NWID_VERTICAL),
      NWidget(NWID_VSCROLLBAR, COLOUR_BROWN, WID_TD_SCROLLBAR),
      NWidget(WWT_RESIZEBOX, COLOUR_BROWN),
    EndContainer(),
  EndContainer(),
};
 
enum TownDirectoryHotkeys {
  TDHK_FOCUS_FILTER_BOX, 
};
 
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;
 
  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 (HasBit(a->have_ratings, _local_company)) {
      if (HasBit(b->have_ratings, _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 (HasBit(b->have_ratings, _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;
  }
 
  void SetStringParameters(WidgetID widget) const override
  {
    switch (widget) {
      case WID_TD_CAPTION:
        SetDParam(0, this->vscroll->GetCount());
        SetDParam(1, Town::GetNumItems());
        break;
 
      case WID_TD_WORLD_POPULATION:
        SetDParam(0, GetWorldPopulation());
        break;
 
      case WID_TD_SORT_CRITERIA:
        SetDParam(0, TownDirectoryWindow::sorter_names[this->towns.SortType()]);
        break;
    }
  }
 
  static StringID GetTownString(const Town *t)
  {
    return t->larger_town ? STR_TOWN_DIRECTORY_CITY : STR_TOWN_DIRECTORY_TOWN;
  }
 
  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 || !HasBit(t->have_ratings, _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_APALLING;
            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);
          }
 
          SetDParam(0, t->index);
          SetDParam(1, t->cache.population);
          DrawString(tr.left, tr.right, tr.top + (this->resize.step_height - GetCharacterHeight(FS_NORMAL)) / 2, GetTownString(t));
 
          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)->widget_data);
        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);
        for (uint i = 0; i < this->towns.size(); i++) {
          const Town *t = this->towns[i];
 
          assert(t != nullptr);
 
          SetDParam(0, t->index);
          SetDParamMaxDigits(1, 8);
          d = maxdim(d, GetStringBoundingBox(GetTownString(t)));
        }
        Dimension icon_size = GetSpriteSize(SPR_TOWN_RATING_GOOD);
        d.width += icon_size.width + 2;
        d.height = std::max(d.height, icon_size.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: {
        SetDParamMaxDigits(0, 10);
        Dimension d = GetStringBoundingBox(STR_TOWN_POPULATION);
        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) 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();
  }
 
  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.buf);
      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();
    }
  }
 
  EventState OnHotkey(int hotkey) override
  {
    switch (hotkey) {
      case TDHK_FOCUS_FILTER_BOX:
        this->SetFocusedWidget(WID_TD_FILTER);
        SetFocusedWindow(this); // The user has asked to give focus to the text box, so make sure this window is focused.
        break;
      default:
        return ES_NOT_HANDLED;
    }
    return ES_HANDLED;
  }
 
  static inline HotkeyList hotkeys {"towndirectory", {
    Hotkey('F', "focus_filter_box", TDHK_FOCUS_FILTER_BOX),
  }};
};
 
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,
  0,
  _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), SetDataTip(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), SetDataTip(STR_FOUND_TOWN_NEW_TOWN_BUTTON, STR_FOUND_TOWN_NEW_TOWN_TOOLTIP), SetFill(1, 0),
      NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_TF_RANDOM_TOWN), SetDataTip(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), SetDataTip(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), SetDataTip(STR_FOUND_TOWN_LOAD_FROM_FILE, STR_FOUND_TOWN_LOAD_FROM_FILE_TOOLTIP), SetFill(1, 0),
      NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_TF_EXPAND_ALL_TOWNS), SetDataTip(STR_FOUND_TOWN_EXPAND_ALL_TOWNS, STR_FOUND_TOWN_EXPAND_ALL_TOWNS_TOOLTIP), SetFill(1, 0),
 
      /* Town name selection. */
      NWidget(WWT_LABEL, COLOUR_DARK_GREEN), SetDataTip(STR_FOUND_TOWN_NAME_TITLE, STR_NULL),
      NWidget(WWT_EDITBOX, COLOUR_GREY, WID_TF_TOWN_NAME_EDITBOX), SetDataTip(STR_FOUND_TOWN_NAME_EDITOR_TITLE, STR_FOUND_TOWN_NAME_EDITOR_HELP), SetFill(1, 0),
      NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_TF_TOWN_NAME_RANDOM), SetDataTip(STR_FOUND_TOWN_NAME_RANDOM_BUTTON, STR_FOUND_TOWN_NAME_RANDOM_TOOLTIP), SetFill(1, 0),
 
      /* Town size selection. */
      NWidget(WWT_LABEL, COLOUR_DARK_GREEN), SetDataTip(STR_FOUND_TOWN_INITIAL_SIZE_TITLE, STR_NULL),
      NWidget(NWID_VERTICAL),
        NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
          NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_SIZE_SMALL), SetDataTip(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), SetDataTip(STR_FOUND_TOWN_INITIAL_SIZE_MEDIUM_BUTTON, STR_FOUND_TOWN_INITIAL_SIZE_TOOLTIP), SetFill(1, 0),
        EndContainer(),
        NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
          NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_SIZE_LARGE), SetDataTip(STR_FOUND_TOWN_INITIAL_SIZE_LARGE_BUTTON, STR_FOUND_TOWN_INITIAL_SIZE_TOOLTIP), SetFill(1, 0),
          NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_SIZE_RANDOM), SetDataTip(STR_FOUND_TOWN_SIZE_RANDOM, STR_FOUND_TOWN_INITIAL_SIZE_TOOLTIP), SetFill(1, 0),
        EndContainer(),
      EndContainer(),
      NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_CITY), SetDataTip(STR_FOUND_TOWN_CITY, STR_FOUND_TOWN_CITY_TOOLTIP), SetFill(1, 0),
 
      /* Town roads selection. */
      NWidget(WWT_LABEL, COLOUR_DARK_GREEN), SetDataTip(STR_FOUND_TOWN_ROAD_LAYOUT, STR_NULL),
      NWidget(NWID_VERTICAL),
        NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
          NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_LAYOUT_ORIGINAL), SetDataTip(STR_FOUND_TOWN_SELECT_LAYOUT_ORIGINAL, STR_FOUND_TOWN_SELECT_TOWN_ROAD_LAYOUT), SetFill(1, 0),
          NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_LAYOUT_BETTER), SetDataTip(STR_FOUND_TOWN_SELECT_LAYOUT_BETTER_ROADS, STR_FOUND_TOWN_SELECT_TOWN_ROAD_LAYOUT), SetFill(1, 0),
        EndContainer(),
        NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
          NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_LAYOUT_GRID2), SetDataTip(STR_FOUND_TOWN_SELECT_LAYOUT_2X2_GRID, STR_FOUND_TOWN_SELECT_TOWN_ROAD_LAYOUT), SetFill(1, 0),
          NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_LAYOUT_GRID3), SetDataTip(STR_FOUND_TOWN_SELECT_LAYOUT_3X3_GRID, STR_FOUND_TOWN_SELECT_TOWN_ROAD_LAYOUT), SetFill(1, 0),
        EndContainer(),
        NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_TF_LAYOUT_RANDOM), SetDataTip(STR_FOUND_TOWN_SELECT_LAYOUT_RANDOM, STR_FOUND_TOWN_SELECT_TOWN_ROAD_LAYOUT), SetFill(1, 0),
      EndContainer(),
    EndContainer(),
  EndContainer(),
};
 
struct FoundTownWindow : Window {
private:
  TownSize town_size;     
  TownLayout town_layout; 
  bool city;              
  QueryString townname_editbox; 
  bool townnamevalid;     
  uint32_t townnameparts;   
  TownNameParams params;  
 
public:
  FoundTownWindow(WindowDesc &desc, WindowNumber window_number) :
      Window(desc),
      town_size(TSZ_MEDIUM),
      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 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) {
      this->SetWidgetsDisabledState(true, WID_TF_RANDOM_TOWN, WID_TF_MANY_RANDOM_TOWNS, WID_TF_LOAD_FROM_FILE, WID_TF_EXPAND_ALL_TOWNS, WID_TF_SIZE_LARGE);
      this->SetWidgetsDisabledState(_settings_game.economy.found_town != TF_CUSTOM_LAYOUT,
          WID_TF_LAYOUT_ORIGINAL, WID_TF_LAYOUT_BETTER, WID_TF_LAYOUT_GRID2, WID_TF_LAYOUT_GRID3, WID_TF_LAYOUT_RANDOM);
      if (_settings_game.economy.found_town != TF_CUSTOM_LAYOUT) town_layout = _settings_game.economy.town_layout;
    }
 
    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->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.buf;
    } else {
      /* If user changed the name, send it */
      std::string original_name = GetTownName(&this->params, this->townnameparts);
      if (original_name != this->townname_editbox.text.buf) name = this->townname_editbox.text.buf;
    }
 
    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(0, 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: {
        Backup<bool> old_generating_world(_generating_world, true);
        UpdateNearestTownForRoadTiles(true);
        if (!GenerateTowns(this->town_layout)) {
          ShowErrorMessage(STR_ERROR_CAN_T_GENERATE_TOWN, STR_ERROR_NO_SPACE_FOR_TOWN, WL_INFO);
        }
        UpdateNearestTownForRoadTiles(false);
        old_generating_world.Restore();
        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(DC_EXEC, t->index, 0);
        }
        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_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 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,
  WDF_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 DrawNewHouseTileInGUI(int x, int y, const HouseSpec *spec, HouseID house_id, int view)
{
  HouseResolverObject object(house_id, INVALID_TILE, nullptr, CBID_NO_CALLBACK, 0, 0, true, view);
  const SpriteGroup *group = object.Resolve();
  if (group == nullptr || group->type != SGT_TILELAYOUT) return;
 
  uint8_t stage = TOWN_HOUSE_COMPLETED;
  const DrawTileSprites *dts = reinterpret_cast<const TileLayoutSpriteGroup *>(group)->ProcessRegisters(&stage);
 
  PaletteID palette = GENERAL_SPRITE_COLOUR(spec->random_colour[0]);
  if (HasBit(spec->callback_mask, CBM_HOUSE_COLOUR)) {
    uint16_t callback = GetHouseCallback(CBID_HOUSE_COLOUR, 0, 0, house_id, nullptr, INVALID_TILE, true, view);
    if (callback != CALLBACK_FAILED) {
      /* If bit 14 is set, we should use a 2cc colour map, else use the callback value. */
      palette = HasBit(callback, 14) ? GB(callback, 0, 8) + SPR_2CCMAP_BASE : callback;
    }
  }
 
  SpriteID image = dts->ground.sprite;
  PaletteID pal  = dts->ground.pal;
 
  if (HasBit(image, SPRITE_MODIFIER_CUSTOM_SPRITE)) image += stage;
  if (HasBit(pal, SPRITE_MODIFIER_CUSTOM_SPRITE)) pal += stage;
 
  if (GB(image, 0, SPRITE_WIDTH) != 0) {
    DrawSprite(image, GroundSpritePaletteTransform(image, pal, palette), x, y);
  }
 
  DrawNewGRFTileSeqInGUI(x, y, dts, stage, palette);
}
 
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.spritegroup[0] != nullptr) {
        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.subtile_x, dcts.subtile_y, 0);
      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 = ScaleGUITrad(TILE_PIXELS);
  int y_delta = ScaleGUITrad(TILE_PIXELS / 2);
 
  const HouseSpec *hs = HouseSpec::Get(house_id);
  if (hs->building_flags & TILE_SIZE_2x2) {
    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 & TILE_SIZE_2x1) {
    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 & TILE_SIZE_1x2) {
    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);
  }
}
 
 
class HousePickerCallbacks : public PickerCallbacks {
public:
  HousePickerCallbacks() : PickerCallbacks("fav_houses") {}
 
  void SetClimateMask()
  {
    switch (_settings_game.game_creation.landscape) {
      case LT_TEMPERATE: this->climate_mask = HZ_TEMP; break;
      case LT_ARCTIC:    this->climate_mask = HZ_SUBARTC_ABOVE | HZ_SUBARTC_BELOW; break;
      case LT_TROPIC:    this->climate_mask = HZ_SUBTROPIC; break;
      case LT_TOYLAND:   this->climate_mask = HZ_TOYLND; break;
      default: NOT_REACHED();
    }
 
    /* 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; 
 
  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, HZB_END> 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,
  };
 
  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.grffile == nullptr) return {0, spec->Index(), cls_id, id};
    return {spec->grf_prop.grffile->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; }
 
  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 & climate_mask) == 0) return INVALID_STRING_ID;
    if (!HasBit(spec->building_availability, 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 (HasBit(spec->building_availability, i)) return INVALID_STRING_ID;
    }
 
     return spec->building_name;
  }
 
  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 = FindFirstBit(hs->building_availability & HZ_ZONALL);
      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::find_if(specs.begin(), specs.end(), [&item](const HouseSpec &spec) { return spec.grf_prop.grffile != nullptr && spec.grf_prop.grffile->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 = FindFirstBit(it->building_availability & HZ_ZONALL);
          dst.insert( {item.grfid, item.local_id, class_index, it->Index()});
        }
      }
    }
 
    return dst;
  }
 
  static HousePickerCallbacks instance;
};
/* static */ HousePickerCallbacks HousePickerCallbacks::instance;
 
struct BuildHouseWindow : public PickerWindow {
  BuildHouseWindow(WindowDesc &desc, Window *parent) : PickerWindow(desc, parent, 0, HousePickerCallbacks::instance)
  {
    HousePickerCallbacks::instance.SetClimateMask();
    this->ConstructWindow();
    this->InvalidateData();
  }
 
  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 & TILE_SIZE_2x2) {
        SetTileSelectSize(2, 2);
      } else if (spec->building_flags & TILE_SIZE_2x1) {
        SetTileSelectSize(2, 1);
      } else if (spec->building_flags & TILE_SIZE_1x2) {
        SetTileSelectSize(1, 2);
      } else if (spec->building_flags & TILE_SIZE_1x1) {
        SetTileSelectSize(1, 1);
      }
    }
  }
 
  void OnInvalidateData(int data = 0, bool gui_scope = true) override
  {
    this->PickerWindow::OnInvalidateData(data, gui_scope);
    if (!gui_scope) return;
 
    if ((data & PickerWindow::PFI_POSITION) != 0) {
      const HouseSpec *spec = HouseSpec::Get(HousePickerCallbacks::sel_type);
      UpdateSelectSize(spec);
    }
  }
 
  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());
  }
 
  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), SetDataTip(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),
    NWidgetFunction(MakePickerClassWidgets),
    NWidgetFunction(MakePickerTypeWidgets),
  EndContainer(),
};
 
static WindowDesc _build_house_desc(
  WDP_AUTO, "build_house", 0, 0,
  WC_BUILD_HOUSE, WC_BUILD_TOOLBAR,
  WDF_CONSTRUCTION,
  _nested_build_house_widgets,
  &BuildHouseWindow::hotkeys
);
 
void ShowBuildHousePicker(Window *parent)
{
  if (BringWindowToFrontById(WC_BUILD_HOUSE, 0)) return;
  new BuildHouseWindow(_build_house_desc, parent);
}