/* $Id$ */

/*
 * 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/>.
 */

/** @file terraform_gui.cpp GUI related to terraforming the map. */

#include "stdafx.h"
#include "clear_map.h"
#include "company_func.h"
#include "company_base.h"
#include "gui.h"
#include "window_gui.h"
#include "window_func.h"
#include "viewport_func.h"
#include "command_func.h"
#include "signs_func.h"
#include "functions.h"
#include "sound_func.h"
#include "base_station_base.h"
#include "textbuf_gui.h"
#include "genworld.h"
#include "tree_map.h"
#include "landscape_type.h"
#include "tilehighlight_func.h"
#include "strings_func.h"
#include "newgrf_object.h"
#include "object.h"
#include "hotkeys.h"

#include "table/strings.h"

void CcTerraform(const CommandCost &result, TileIndex tile, uint32 p1, uint32 p2)
{
	if (result.Succeeded()) {
		SndPlayTileFx(SND_1F_SPLAT, tile);
	} else {
		extern TileIndex _terraform_err_tile;
		SetRedErrorSquare(_terraform_err_tile);
	}
}


/** Scenario editor command that generates desert areas */
static void GenerateDesertArea(TileIndex end, TileIndex start)
{
	if (_game_mode != GM_EDITOR) return;

	_generating_world = true;

	TileArea ta(start, end);
	TILE_AREA_LOOP(tile, ta) {
		SetTropicZone(tile, (_ctrl_pressed) ? TROPICZONE_NORMAL : TROPICZONE_DESERT);
		DoCommandP(tile, 0, 0, CMD_LANDSCAPE_CLEAR);
		MarkTileDirtyByTile(tile);
	}
	_generating_world = false;
}

/** Scenario editor command that generates rocky areas */
static void GenerateRockyArea(TileIndex end, TileIndex start)
{
	if (_game_mode != GM_EDITOR) return;

	bool success = false;
	TileArea ta(start, end);

	TILE_AREA_LOOP(tile, ta) {
		switch (GetTileType(tile)) {
			case MP_TREES:
				if (GetTreeGround(tile) == TREE_GROUND_SHORE) continue;
				/* FALL THROUGH */
			case MP_CLEAR:
				MakeClear(tile, CLEAR_ROCKS, 3);
				break;

			default: continue;
		}
		MarkTileDirtyByTile(tile);
		success = true;
	}

	if (success) SndPlayTileFx(SND_1F_SPLAT, end);
}

/**
 * A central place to handle all X_AND_Y dragged GUI functions.
 * @param proc       Procedure related to the dragging
 * @param start_tile Begin of the dragging
 * @param end_tile   End of the dragging
 * @return Returns true if the action was found and handled, and false otherwise. This
 * allows for additional implements that are more local. For example X_Y drag
 * of convertrail which belongs in rail_gui.cpp and not terraform_gui.cpp
 */
bool GUIPlaceProcDragXY(ViewportDragDropSelectionProcess proc, TileIndex start_tile, TileIndex end_tile)
{
	if (!_settings_game.construction.freeform_edges) {
		/* When end_tile is MP_VOID, the error tile will not be visible to the
		 * user. This happens when terraforming at the southern border. */
		if (TileX(end_tile) == MapMaxX()) end_tile += TileDiffXY(-1, 0);
		if (TileY(end_tile) == MapMaxY()) end_tile += TileDiffXY(0, -1);
	}

	switch (proc) {
		case DDSP_DEMOLISH_AREA:
			DoCommandP(end_tile, start_tile, _ctrl_pressed ? 1 : 0, CMD_CLEAR_AREA | CMD_MSG(STR_ERROR_CAN_T_CLEAR_THIS_AREA), CcPlaySound10);
			break;
		case DDSP_RAISE_AND_LEVEL_AREA:
			DoCommandP(end_tile, start_tile, LM_RAISE << 1 | (_ctrl_pressed ? 1 : 0), CMD_LEVEL_LAND | CMD_MSG(STR_ERROR_CAN_T_RAISE_LAND_HERE), CcTerraform);
			break;
		case DDSP_LOWER_AND_LEVEL_AREA:
			DoCommandP(end_tile, start_tile, LM_LOWER << 1 | (_ctrl_pressed ? 1 : 0), CMD_LEVEL_LAND | CMD_MSG(STR_ERROR_CAN_T_LOWER_LAND_HERE), CcTerraform);
			break;
		case DDSP_LEVEL_AREA:
			DoCommandP(end_tile, start_tile, LM_LEVEL << 1 | (_ctrl_pressed ? 1 : 0), CMD_LEVEL_LAND | CMD_MSG(STR_ERROR_CAN_T_LEVEL_LAND_HERE), CcTerraform);
			break;
		case DDSP_CREATE_ROCKS:
			GenerateRockyArea(end_tile, start_tile);
			break;
		case DDSP_CREATE_DESERT:
			GenerateDesertArea(end_tile, start_tile);
			break;
		default:
			return false;
	}

	return true;
}

typedef void OnButtonClick(Window *w);

static void PlaceProc_BuyLand(TileIndex tile)
{
	DoCommandP(tile, OBJECT_OWNED_LAND, 0, CMD_BUILD_OBJECT | CMD_MSG(STR_ERROR_CAN_T_PURCHASE_THIS_LAND), CcPlaySound1E);
}

void PlaceProc_DemolishArea(TileIndex tile)
{
	VpStartPlaceSizing(tile, VPM_X_AND_Y, DDSP_DEMOLISH_AREA);
}

static void PlaceProc_RaiseLand(TileIndex tile)
{
	VpStartPlaceSizing(tile, VPM_X_AND_Y, DDSP_RAISE_AND_LEVEL_AREA);
}

static void PlaceProc_LowerLand(TileIndex tile)
{
	VpStartPlaceSizing(tile, VPM_X_AND_Y, DDSP_LOWER_AND_LEVEL_AREA);
}

static void PlaceProc_LevelLand(TileIndex tile)
{
	VpStartPlaceSizing(tile, VPM_X_AND_Y, DDSP_LEVEL_AREA);
}

/** Enum referring to the widgets of the terraform toolbar */
enum TerraformToolbarWidgets {
	TTW_SHOW_PLACE_OBJECT,                ///< Should the place object button be shown?
	TTW_BUTTONS_START,                    ///< Start of pushable buttons
	TTW_LOWER_LAND = TTW_BUTTONS_START,   ///< Lower land button
	TTW_RAISE_LAND,                       ///< Raise land button
	TTW_LEVEL_LAND,                       ///< Level land button
	TTW_DEMOLISH,                         ///< Demolish aka dynamite button
	TTW_BUY_LAND,                         ///< Buy land button
	TTW_PLANT_TREES,                      ///< Plant trees button (note: opens seperate window, no place-push-button)
	TTW_PLACE_SIGN,                       ///< Place sign button
	TTW_PLACE_OBJECT,                     ///< Place object button
};

static void TerraformClick_Lower(Window *w)
{
	HandlePlacePushButton(w, TTW_LOWER_LAND, ANIMCURSOR_LOWERLAND, HT_POINT, PlaceProc_LowerLand);
}

static void TerraformClick_Raise(Window *w)
{
	HandlePlacePushButton(w, TTW_RAISE_LAND, ANIMCURSOR_RAISELAND, HT_POINT, PlaceProc_RaiseLand);
}

static void TerraformClick_Level(Window *w)
{
	HandlePlacePushButton(w, TTW_LEVEL_LAND, SPR_CURSOR_LEVEL_LAND, HT_POINT, PlaceProc_LevelLand);
}

static void TerraformClick_Dynamite(Window *w)
{
	HandlePlacePushButton(w, TTW_DEMOLISH, ANIMCURSOR_DEMOLISH, HT_RECT, PlaceProc_DemolishArea);
}

static void TerraformClick_BuyLand(Window *w)
{
	HandlePlacePushButton(w, TTW_BUY_LAND, SPR_CURSOR_BUY_LAND, HT_RECT, PlaceProc_BuyLand);
}

static void TerraformClick_Trees(Window *w)
{
	/* This button is NOT a place-push-button, so don't treat it as such */
	w->HandleButtonClick(TTW_PLANT_TREES);
	ShowBuildTreesToolbar();
}

static void TerraformClick_PlaceSign(Window *w)
{
	HandlePlacePushButton(w, TTW_PLACE_SIGN, SPR_CURSOR_SIGN, HT_RECT, PlaceProc_Sign);
}

static void TerraformClick_PlaceObject(Window *w)
{
	/* Don't show the place object button when there are no objects to place. */
	if (ObjectClass::GetCount() == 0) return;
	if (HandlePlacePushButton(w, TTW_PLACE_OBJECT, SPR_CURSOR_TRANSMITTER, HT_RECT, PlaceProc_Object)) ShowBuildObjectPicker(w);
}

static OnButtonClick * const _terraform_button_proc[] = {
	TerraformClick_Lower,
	TerraformClick_Raise,
	TerraformClick_Level,
	TerraformClick_Dynamite,
	TerraformClick_BuyLand,
	TerraformClick_Trees,
	TerraformClick_PlaceSign,
	TerraformClick_PlaceObject,
};

struct TerraformToolbarWindow : Window {
	TerraformToolbarWindow(const WindowDesc *desc, WindowNumber window_number) : Window()
	{
		/* This is needed as we like to have the tree available on OnInit. */
		this->CreateNestedTree(desc);
		this->FinishInitNested(desc, window_number);
	}

	~TerraformToolbarWindow()
	{
	}

	virtual void OnInit()
	{
		/* Don't show the place object button when there are no objects to place. */
		NWidgetStacked *show_object = this->GetWidget<NWidgetStacked>(TTW_SHOW_PLACE_OBJECT);
		show_object->SetDisplayedPlane(ObjectClass::GetCount() != 0 ? 0 : SZSP_NONE);
	}

	virtual void OnClick(Point pt, int widget, int click_count)
	{
		if (widget >= TTW_BUTTONS_START) _terraform_button_proc[widget - TTW_BUTTONS_START](this);
	}

	virtual void OnTimeout()
	{
		this->RaiseWidget(TTW_PLANT_TREES);
		this->SetWidgetDirty(TTW_PLANT_TREES);
	}

	virtual EventState OnKeyPress(uint16 key, uint16 keycode)
	{
		int num = CheckHotkeyMatch(terraform_hotkeys, keycode, this);
		if (num == -1) return ES_NOT_HANDLED;
		this->OnClick(Point(), num, 1);
		return ES_HANDLED;
	}

	virtual void OnPlaceObject(Point pt, TileIndex tile)
	{
		_place_proc(tile);
	}

	virtual void OnPlaceDrag(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt)
	{
		VpSelectTilesWithMethod(pt.x, pt.y, select_method);
	}

	virtual Point OnInitialPosition(const WindowDesc *desc, int16 sm_width, int16 sm_height, int window_number)
	{
		Point pt = GetToolbarAlignedWindowPosition(sm_width);
		pt.y += sm_height;
		return pt;
	}

	virtual void OnPlaceMouseUp(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt, TileIndex start_tile, TileIndex end_tile)
	{
		if (pt.x != -1) {
			switch (select_proc) {
				default: NOT_REACHED();
				case DDSP_DEMOLISH_AREA:
				case DDSP_RAISE_AND_LEVEL_AREA:
				case DDSP_LOWER_AND_LEVEL_AREA:
				case DDSP_LEVEL_AREA:
					GUIPlaceProcDragXY(select_proc, start_tile, end_tile);
					break;
			}
		}
	}

	virtual void OnPlaceObjectAbort()
	{
		DeleteWindowById(WC_BUILD_OBJECT, 0);
		this->RaiseButtons();
	}

	static Hotkey<TerraformToolbarWindow> terraform_hotkeys[];
};

Hotkey<TerraformToolbarWindow> TerraformToolbarWindow::terraform_hotkeys[] = {
	Hotkey<TerraformToolbarWindow>('Q' | WKC_GLOBAL_HOTKEY, "lower", TTW_LOWER_LAND),
	Hotkey<TerraformToolbarWindow>('W' | WKC_GLOBAL_HOTKEY, "raise", TTW_RAISE_LAND),
	Hotkey<TerraformToolbarWindow>('E' | WKC_GLOBAL_HOTKEY, "level", TTW_LEVEL_LAND),
	Hotkey<TerraformToolbarWindow>('D' | WKC_GLOBAL_HOTKEY, "dynamite", TTW_DEMOLISH),
	Hotkey<TerraformToolbarWindow>('U', "buyland", TTW_BUY_LAND),
	Hotkey<TerraformToolbarWindow>('I', "trees", TTW_PLANT_TREES),
	Hotkey<TerraformToolbarWindow>('O', "placesign", TTW_PLACE_SIGN),
	Hotkey<TerraformToolbarWindow>('P', "placeobject", TTW_PLACE_OBJECT),
	HOTKEY_LIST_END(TerraformToolbarWindow)
};
Hotkey<TerraformToolbarWindow> *_terraform_hotkeys = TerraformToolbarWindow::terraform_hotkeys;

static const NWidgetPart _nested_terraform_widgets[] = {
	NWidget(NWID_HORIZONTAL),
		NWidget(WWT_CLOSEBOX, COLOUR_DARK_GREEN),
		NWidget(WWT_CAPTION, COLOUR_DARK_GREEN), SetDataTip(STR_LANDSCAPING_TOOLBAR, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
		NWidget(WWT_STICKYBOX, COLOUR_DARK_GREEN),
	EndContainer(),
	NWidget(NWID_HORIZONTAL),
		NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, TTW_LOWER_LAND), SetMinimalSize(22, 22),
								SetFill(0, 1), SetDataTip(SPR_IMG_TERRAFORM_DOWN, STR_LANDSCAPING_TOOLTIP_LOWER_A_CORNER_OF_LAND),
		NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, TTW_RAISE_LAND), SetMinimalSize(22, 22),
								SetFill(0, 1), SetDataTip(SPR_IMG_TERRAFORM_UP, STR_LANDSCAPING_TOOLTIP_RAISE_A_CORNER_OF_LAND),
		NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, TTW_LEVEL_LAND), SetMinimalSize(22, 22),
								SetFill(0, 1), SetDataTip(SPR_IMG_LEVEL_LAND, STR_LANDSCAPING_LEVEL_LAND_TOOLTIP),

		NWidget(WWT_PANEL, COLOUR_DARK_GREEN), SetMinimalSize(4, 22), EndContainer(),

		NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, TTW_DEMOLISH), SetMinimalSize(22, 22),
								SetFill(0, 1), SetDataTip(SPR_IMG_DYNAMITE, STR_TOOLTIP_DEMOLISH_BUILDINGS_ETC),
		NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, TTW_BUY_LAND), SetMinimalSize(22, 22),
								SetFill(0, 1), SetDataTip(SPR_IMG_BUY_LAND, STR_LANDSCAPING_TOOLTIP_PURCHASE_LAND),
		NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, TTW_PLANT_TREES), SetMinimalSize(22, 22),
								SetFill(0, 1), SetDataTip(SPR_IMG_PLANTTREES, STR_SCENEDIT_TOOLBAR_PLANT_TREES),
		NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, TTW_PLACE_SIGN), SetMinimalSize(22, 22),
								SetFill(0, 1), SetDataTip(SPR_IMG_SIGN, STR_SCENEDIT_TOOLBAR_PLACE_SIGN),
		NWidget(NWID_SELECTION, INVALID_COLOUR, TTW_SHOW_PLACE_OBJECT),
			NWidget(WWT_IMGBTN, COLOUR_DARK_GREEN, TTW_PLACE_OBJECT), SetMinimalSize(22, 22),
								SetFill(0, 1), SetDataTip(SPR_IMG_TRANSMITTER, STR_SCENEDIT_TOOLBAR_PLACE_OBJECT),
		EndContainer(),
	EndContainer(),
};

static const WindowDesc _terraform_desc(
	WDP_MANUAL, 0, 0,
	WC_SCEN_LAND_GEN, WC_NONE,
	WDF_CONSTRUCTION,
	_nested_terraform_widgets, lengthof(_nested_terraform_widgets)
);

Window *ShowTerraformToolbar(Window *link)
{
	if (!Company::IsValidID(_local_company)) return NULL;

	Window *w;
	if (link == NULL) {
		w = AllocateWindowDescFront<TerraformToolbarWindow>(&_terraform_desc, 0);
		return w;
	}

	/* Delete the terraform toolbar to place it again. */
	DeleteWindowById(WC_SCEN_LAND_GEN, 0, true);
	w = AllocateWindowDescFront<TerraformToolbarWindow>(&_terraform_desc, 0);
	/* Align the terraform toolbar under the main toolbar. */
	w->top -= w->height;
	w->SetDirty();
	/* Put the linked toolbar to the left / right of it. */
	link->left = w->left + (_current_text_dir == TD_RTL ? w->width : -link->width);
	link->top  = w->top;
	link->SetDirty();

	return w;
}

EventState TerraformToolbarGlobalHotkeys(uint16 key, uint16 keycode)
{
	int num = CheckHotkeyMatch<TerraformToolbarWindow>(_terraform_hotkeys, keycode, NULL, true);
	if (num == -1) return ES_NOT_HANDLED;
	Window *w = ShowTerraformToolbar(NULL);
	if (w == NULL) return ES_NOT_HANDLED;
	return w->OnKeyPress(key, keycode);
}

static byte _terraform_size = 1;

/**
 * Raise/Lower a bigger chunk of land at the same time in the editor. When
 * raising get the lowest point, when lowering the highest point, and set all
 * tiles in the selection to that height.
 * @todo : Incorporate into game itself to allow for ingame raising/lowering of
 *         larger chunks at the same time OR remove altogether, as we have 'level land' ?
 * @param tile The top-left tile where the terraforming will start
 * @param mode 1 for raising, 0 for lowering land
 */
static void CommonRaiseLowerBigLand(TileIndex tile, int mode)
{
	if (_terraform_size == 1) {
		StringID msg =
			mode ? STR_ERROR_CAN_T_RAISE_LAND_HERE : STR_ERROR_CAN_T_LOWER_LAND_HERE;

		DoCommandP(tile, SLOPE_N, (uint32)mode, CMD_TERRAFORM_LAND | CMD_MSG(msg), CcTerraform);
	} else {
		assert(_terraform_size != 0);
		TileArea ta(tile, _terraform_size, _terraform_size);
		ta.ClampToMap();

		if (ta.w == 0 || ta.h == 0) return;

		SndPlayTileFx(SND_1F_SPLAT, tile);

		uint h;
		if (mode != 0) {
			/* Raise land */
			h = MAX_TILE_HEIGHT;
			TILE_AREA_LOOP(tile2, ta) {
				h = min(h, TileHeight(tile2));
			}
		} else {
			/* Lower land */
			h = 0;
			TILE_AREA_LOOP(tile2, ta) {
				h = max(h, TileHeight(tile2));
			}
		}

		TILE_AREA_LOOP(tile2, ta) {
			if (TileHeight(tile2) == h) {
				DoCommandP(tile2, SLOPE_N, (uint32)mode, CMD_TERRAFORM_LAND);
			}
		}
	}
}

static void PlaceProc_RaiseBigLand(TileIndex tile)
{
	CommonRaiseLowerBigLand(tile, 1);
}

static void PlaceProc_LowerBigLand(TileIndex tile)
{
	CommonRaiseLowerBigLand(tile, 0);
}

static void PlaceProc_RockyArea(TileIndex tile)
{
	VpStartPlaceSizing(tile, VPM_X_AND_Y, DDSP_CREATE_ROCKS);
}

static void PlaceProc_DesertArea(TileIndex tile)
{
	VpStartPlaceSizing(tile, VPM_X_AND_Y, DDSP_CREATE_DESERT);
}

static const int8 _multi_terraform_coords[][2] = {
	{  0, -2},
	{  4,  0}, { -4,  0}, {  0,  2},
	{ -8,  2}, { -4,  4}, {  0,  6}, {  4,  4}, {  8,  2},
	{-12,  0}, { -8, -2}, { -4, -4}, {  0, -6}, {  4, -4}, {  8, -2}, { 12,  0},
	{-16,  2}, {-12,  4}, { -8,  6}, { -4,  8}, {  0, 10}, {  4,  8}, {  8,  6}, { 12,  4}, { 16,  2},
	{-20,  0}, {-16, -2}, {-12, -4}, { -8, -6}, { -4, -8}, {  0,-10}, {  4, -8}, {  8, -6}, { 12, -4}, { 16, -2}, { 20,  0},
	{-24,  2}, {-20,  4}, {-16,  6}, {-12,  8}, { -8, 10}, { -4, 12}, {  0, 14}, {  4, 12}, {  8, 10}, { 12,  8}, { 16,  6}, { 20,  4}, { 24,  2},
	{-28,  0}, {-24, -2}, {-20, -4}, {-16, -6}, {-12, -8}, { -8,-10}, { -4,-12}, {  0,-14}, {  4,-12}, {  8,-10}, { 12, -8}, { 16, -6}, { 20, -4}, { 24, -2}, { 28,  0},
};

/** Enum referring to the widgets of the editor terraform toolbar */
enum EditorTerraformToolbarWidgets {
	ETTW_SHOW_PLACE_DESERT,                ///< Should the place desert button be shown?
	ETTW_START,                            ///< Used for iterations
	ETTW_DOTS = ETTW_START,                ///< Invisible widget for rendering the terraform size on.
	ETTW_BUTTONS_START,                    ///< Start of pushable buttons
	ETTW_DEMOLISH = ETTW_BUTTONS_START,    ///< Demolish aka dynamite button
	ETTW_LOWER_LAND,                       ///< Lower land button
	ETTW_RAISE_LAND,                       ///< Raise land button
	ETTW_LEVEL_LAND,                       ///< Level land button
	ETTW_PLACE_ROCKS,                      ///< Place rocks button
	ETTW_PLACE_DESERT,                     ///< Place desert button (in tropical climate)
	ETTW_PLACE_OBJECT,                     ///< Place transmitter button
	ETTW_BUTTONS_END,                      ///< End of pushable buttons
	ETTW_INCREASE_SIZE = ETTW_BUTTONS_END, ///< Upwards arrow button to increase terraforming size
	ETTW_DECREASE_SIZE,                    ///< Downwards arrow button to decrease terraforming size
	ETTW_NEW_SCENARIO,                     ///< Button for generating a new scenario
	ETTW_RESET_LANDSCAPE,                  ///< Button for removing all company-owned property
};

static const NWidgetPart _nested_scen_edit_land_gen_widgets[] = {
	NWidget(NWID_HORIZONTAL),
		NWidget(WWT_CLOSEBOX, COLOUR_DARK_GREEN),
		NWidget(WWT_CAPTION, COLOUR_DARK_GREEN), SetDataTip(STR_TERRAFORM_TOOLBAR_LAND_GENERATION_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
		NWidget(WWT_SHADEBOX, COLOUR_DARK_GREEN),
		NWidget(WWT_STICKYBOX, COLOUR_DARK_GREEN),
	EndContainer(),
	NWidget(WWT_PANEL, COLOUR_DARK_GREEN),
		NWidget(NWID_HORIZONTAL), SetPadding(2, 2, 7, 2),
			NWidget(NWID_SPACER), SetFill(1, 0),
			NWidget(WWT_IMGBTN, COLOUR_GREY, ETTW_DEMOLISH), SetMinimalSize(22, 22),
										SetFill(0, 1), SetDataTip(SPR_IMG_DYNAMITE, STR_TOOLTIP_DEMOLISH_BUILDINGS_ETC),
			NWidget(WWT_IMGBTN, COLOUR_GREY, ETTW_LOWER_LAND), SetMinimalSize(22, 22),
										SetFill(0, 1), SetDataTip(SPR_IMG_TERRAFORM_DOWN, STR_LANDSCAPING_TOOLTIP_LOWER_A_CORNER_OF_LAND),
			NWidget(WWT_IMGBTN, COLOUR_GREY, ETTW_RAISE_LAND), SetMinimalSize(22, 22),
										SetFill(0, 1), SetDataTip(SPR_IMG_TERRAFORM_UP, STR_LANDSCAPING_TOOLTIP_RAISE_A_CORNER_OF_LAND),
			NWidget(WWT_IMGBTN, COLOUR_GREY, ETTW_LEVEL_LAND), SetMinimalSize(22, 22),
										SetFill(0, 1), SetDataTip(SPR_IMG_LEVEL_LAND, STR_LANDSCAPING_LEVEL_LAND_TOOLTIP),
			NWidget(WWT_IMGBTN, COLOUR_GREY, ETTW_PLACE_ROCKS), SetMinimalSize(22, 22),
										SetFill(0, 1), SetDataTip(SPR_IMG_ROCKS, STR_TERRAFORM_TOOLTIP_PLACE_ROCKY_AREAS_ON_LANDSCAPE),
			NWidget(NWID_SELECTION, INVALID_COLOUR, ETTW_SHOW_PLACE_DESERT),
				NWidget(WWT_IMGBTN, COLOUR_GREY, ETTW_PLACE_DESERT), SetMinimalSize(22, 22),
											SetFill(0, 1), SetDataTip(SPR_IMG_DESERT, STR_TERRAFORM_TOOLTIP_DEFINE_DESERT_AREA),
			EndContainer(),
			NWidget(WWT_IMGBTN, COLOUR_GREY, ETTW_PLACE_OBJECT), SetMinimalSize(23, 22),
										SetFill(0, 1), SetDataTip(SPR_IMG_TRANSMITTER, STR_SCENEDIT_TOOLBAR_PLACE_OBJECT),
			NWidget(NWID_SPACER), SetFill(1, 0),
		EndContainer(),
		NWidget(NWID_HORIZONTAL),
			NWidget(NWID_SPACER), SetFill(1, 0),
			NWidget(WWT_EMPTY, COLOUR_DARK_GREEN, ETTW_DOTS), SetMinimalSize(59, 31), SetDataTip(STR_EMPTY, STR_NULL),
			NWidget(NWID_SPACER), SetFill(1, 0),
			NWidget(NWID_VERTICAL),
				NWidget(NWID_SPACER), SetFill(0, 1),
				NWidget(WWT_IMGBTN, COLOUR_GREY, ETTW_INCREASE_SIZE), SetMinimalSize(12, 12), SetDataTip(SPR_ARROW_UP, STR_TERRAFORM_TOOLTIP_INCREASE_SIZE_OF_LAND_AREA),
				NWidget(NWID_SPACER), SetMinimalSize(0, 1),
				NWidget(WWT_IMGBTN, COLOUR_GREY, ETTW_DECREASE_SIZE), SetMinimalSize(12, 12), SetDataTip(SPR_ARROW_DOWN, STR_TERRAFORM_TOOLTIP_DECREASE_SIZE_OF_LAND_AREA),
				NWidget(NWID_SPACER), SetFill(0, 1),
			EndContainer(),
			NWidget(NWID_SPACER), SetMinimalSize(2, 0),
		EndContainer(),
		NWidget(NWID_SPACER), SetMinimalSize(0, 6),
		NWidget(WWT_TEXTBTN, COLOUR_GREY, ETTW_NEW_SCENARIO), SetMinimalSize(160, 12),
								SetFill(1, 0), SetDataTip(STR_TERRAFORM_SE_NEW_WORLD, STR_TERRAFORM_TOOLTIP_GENERATE_RANDOM_LAND), SetPadding(0, 2, 0, 2),
		NWidget(WWT_TEXTBTN, COLOUR_GREY, ETTW_RESET_LANDSCAPE), SetMinimalSize(160, 12),
								SetFill(1, 0), SetDataTip(STR_TERRAFORM_RESET_LANDSCAPE, STR_TERRAFORM_RESET_LANDSCAPE_TOOLTIP), SetPadding(1, 2, 2, 2),
	EndContainer(),
};

/**
 * @todo Merge with terraform_gui.cpp (move there) after I have cooled down at its braindeadness
 * and changed OnButtonClick to include the widget as well in the function declaration. Post 0.4.0 - Darkvater
 */
static void EditorTerraformClick_Dynamite(Window *w)
{
	HandlePlacePushButton(w, ETTW_DEMOLISH, ANIMCURSOR_DEMOLISH, HT_RECT, PlaceProc_DemolishArea);
}

static void EditorTerraformClick_LowerBigLand(Window *w)
{
	HandlePlacePushButton(w, ETTW_LOWER_LAND, ANIMCURSOR_LOWERLAND, HT_POINT, PlaceProc_LowerBigLand);
}

static void EditorTerraformClick_RaiseBigLand(Window *w)
{
	HandlePlacePushButton(w, ETTW_RAISE_LAND, ANIMCURSOR_RAISELAND, HT_POINT, PlaceProc_RaiseBigLand);
}

static void EditorTerraformClick_LevelLand(Window *w)
{
	HandlePlacePushButton(w, ETTW_LEVEL_LAND, SPR_CURSOR_LEVEL_LAND, HT_POINT, PlaceProc_LevelLand);
}

static void EditorTerraformClick_RockyArea(Window *w)
{
	HandlePlacePushButton(w, ETTW_PLACE_ROCKS, SPR_CURSOR_ROCKY_AREA, HT_RECT, PlaceProc_RockyArea);
}

static void EditorTerraformClick_Desert(Window *w)
{
	HandlePlacePushButton(w, ETTW_PLACE_DESERT, SPR_CURSOR_DESERT, HT_RECT, PlaceProc_DesertArea);
}

static void EditorTerraformClick_PlaceObject(Window *w)
{
	if (HandlePlacePushButton(w, ETTW_PLACE_OBJECT, SPR_CURSOR_TRANSMITTER, HT_RECT, PlaceProc_Object)) ShowBuildObjectPicker(w);
}

static OnButtonClick * const _editor_terraform_button_proc[] = {
	EditorTerraformClick_Dynamite,
	EditorTerraformClick_LowerBigLand,
	EditorTerraformClick_RaiseBigLand,
	EditorTerraformClick_LevelLand,
	EditorTerraformClick_RockyArea,
	EditorTerraformClick_Desert,
	EditorTerraformClick_PlaceObject
};


/**
 * Callback function for the scenario editor 'reset landscape' confirmation window
 * @param w Window unused
 * @param confirmed boolean value, true when yes was clicked, false otherwise
 */
static void ResetLandscapeConfirmationCallback(Window *w, bool confirmed)
{
	if (confirmed) {
		/* Set generating_world to true to get instant-green grass after removing
		 * company property. */
		_generating_world = true;

		/* Delete all companies */
		Company *c;
		FOR_ALL_COMPANIES(c) {
			ChangeOwnershipOfCompanyItems(c->index, INVALID_OWNER);
			delete c;
		}

		_generating_world = false;

		/* Delete all station signs */
		BaseStation *st;
		FOR_ALL_BASE_STATIONS(st) {
			/* There can be buoys, remove them */
			if (IsBuoyTile(st->xy)) DoCommand(st->xy, 0, 0, DC_EXEC | DC_BANKRUPT, CMD_LANDSCAPE_CLEAR);
			if (!st->IsInUse()) delete st;
		}

		MarkWholeScreenDirty();
	}
}

/**
 * Checks whether we are currently dragging diagonally.
 * @returns True iff we are selecting a diagonal rectangle for an action that supports it, otherwise false.
 */
bool IsDraggingDiagonal()
{
	return _ctrl_pressed && _left_button_down && (
			_place_proc == PlaceProc_DemolishArea || _place_proc == PlaceProc_LevelLand ||
			_place_proc == PlaceProc_RaiseLand    || _place_proc == PlaceProc_LowerLand);
}

struct ScenarioEditorLandscapeGenerationWindow : Window {
	ScenarioEditorLandscapeGenerationWindow(const WindowDesc *desc, WindowNumber window_number) : Window()
	{
		this->CreateNestedTree(desc);
		NWidgetStacked *show_desert = this->GetWidget<NWidgetStacked>(ETTW_SHOW_PLACE_DESERT);
		show_desert->SetDisplayedPlane(_settings_game.game_creation.landscape == LT_TROPIC ? 0 : SZSP_NONE);
		this->FinishInitNested(desc, window_number);
	}

	virtual void OnPaint()
	{
		this->DrawWidgets();

		if (this->IsWidgetLowered(ETTW_LOWER_LAND) || this->IsWidgetLowered(ETTW_RAISE_LAND)) { // change area-size if raise/lower corner is selected
			SetTileSelectSize(_terraform_size, _terraform_size);
		}
	}

	virtual void DrawWidget(const Rect &r, int widget) const
	{
		if (widget != ETTW_DOTS) return;

		int center_x = RoundDivSU(r.left + r.right, 2);
		int center_y = RoundDivSU(r.top + r.bottom, 2);

		int n = _terraform_size * _terraform_size;
		const int8 *coords = &_multi_terraform_coords[0][0];

		assert(n != 0);
		do {
			DrawSprite(SPR_WHITE_POINT, PAL_NONE, center_x + coords[0], center_y + coords[1]);
			coords += 2;
		} while (--n);
	}

	virtual EventState OnKeyPress(uint16 key, uint16 keycode)
	{
		int num = CheckHotkeyMatch(terraform_editor_hotkeys, keycode, this);
		if (num == -1) return ES_NOT_HANDLED;
		this->OnClick(Point(), num, 1);
		return ES_HANDLED;
	}

	virtual void OnClick(Point pt, int widget, int click_count)
	{
		if (IsInsideMM(widget, ETTW_BUTTONS_START, ETTW_BUTTONS_END)) {
			_editor_terraform_button_proc[widget - ETTW_BUTTONS_START](this);
		} else {
			switch (widget) {
				case ETTW_INCREASE_SIZE:
				case ETTW_DECREASE_SIZE: { // Increase/Decrease terraform size
					int size = (widget == ETTW_INCREASE_SIZE) ? 1 : -1;
					this->HandleButtonClick(widget);
					size += _terraform_size;

					if (!IsInsideMM(size, 1, 8 + 1)) return;
					_terraform_size = size;

					SndPlayFx(SND_15_BEEP);
					this->SetDirty();
					break;
				}
				case ETTW_NEW_SCENARIO: // gen random land
					this->HandleButtonClick(widget);
					ShowCreateScenario();
					break;
				case ETTW_RESET_LANDSCAPE: // Reset landscape
					ShowQuery(
						STR_QUERY_RESET_LANDSCAPE_CAPTION,
						STR_RESET_LANDSCAPE_CONFIRMATION_TEXT,
						NULL,
						ResetLandscapeConfirmationCallback);
					break;
			}
		}
	}

	virtual void OnTimeout()
	{
		for (uint i = ETTW_START; i < this->nested_array_size; i++) {
			if (i == ETTW_BUTTONS_START) i = ETTW_BUTTONS_END; // skip the buttons
			if (this->IsWidgetLowered(i)) {
				this->RaiseWidget(i);
				this->SetWidgetDirty(i);
			}
		}
	}

	virtual void OnPlaceObject(Point pt, TileIndex tile)
	{
		_place_proc(tile);
	}

	virtual void OnPlaceDrag(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt)
	{
		VpSelectTilesWithMethod(pt.x, pt.y, select_method);
	}

	virtual void OnPlaceMouseUp(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt, TileIndex start_tile, TileIndex end_tile)
	{
		if (pt.x != -1) {
			switch (select_proc) {
				default: NOT_REACHED();
				case DDSP_CREATE_ROCKS:
				case DDSP_CREATE_DESERT:
				case DDSP_RAISE_AND_LEVEL_AREA:
				case DDSP_LOWER_AND_LEVEL_AREA:
				case DDSP_LEVEL_AREA:
				case DDSP_DEMOLISH_AREA:
					GUIPlaceProcDragXY(select_proc, start_tile, end_tile);
					break;
			}
		}
	}

	virtual void OnPlaceObjectAbort()
	{
		this->RaiseButtons();
		this->SetDirty();
		DeleteWindowById(WC_BUILD_OBJECT, 0);
	}

	static Hotkey<ScenarioEditorLandscapeGenerationWindow> terraform_editor_hotkeys[];
};

Hotkey<ScenarioEditorLandscapeGenerationWindow> ScenarioEditorLandscapeGenerationWindow::terraform_editor_hotkeys[] = {
	Hotkey<ScenarioEditorLandscapeGenerationWindow>('D' | WKC_GLOBAL_HOTKEY, "dynamite", ETTW_DEMOLISH),
	Hotkey<ScenarioEditorLandscapeGenerationWindow>('Q' | WKC_GLOBAL_HOTKEY, "lower", ETTW_LOWER_LAND),
	Hotkey<ScenarioEditorLandscapeGenerationWindow>('W' | WKC_GLOBAL_HOTKEY, "raise", ETTW_RAISE_LAND),
	Hotkey<ScenarioEditorLandscapeGenerationWindow>('E' | WKC_GLOBAL_HOTKEY, "level", ETTW_LEVEL_LAND),
	Hotkey<ScenarioEditorLandscapeGenerationWindow>('R', "rocky", ETTW_PLACE_ROCKS),
	Hotkey<ScenarioEditorLandscapeGenerationWindow>('T', "desert", ETTW_PLACE_DESERT),
	Hotkey<ScenarioEditorLandscapeGenerationWindow>('O', "object", ETTW_PLACE_OBJECT),
	HOTKEY_LIST_END(ScenarioEditorLandscapeGenerationWindow)
};

Hotkey<ScenarioEditorLandscapeGenerationWindow> *_terraform_editor_hotkeys = ScenarioEditorLandscapeGenerationWindow::terraform_editor_hotkeys;

static const WindowDesc _scen_edit_land_gen_desc(
	WDP_AUTO, 0, 0,
	WC_SCEN_LAND_GEN, WC_NONE,
	WDF_CONSTRUCTION,
	_nested_scen_edit_land_gen_widgets, lengthof(_nested_scen_edit_land_gen_widgets)
);

Window *ShowEditorTerraformToolbar()
{
	return AllocateWindowDescFront<ScenarioEditorLandscapeGenerationWindow>(&_scen_edit_land_gen_desc, 0);
}

EventState TerraformToolbarEditorGlobalHotkeys(uint16 key, uint16 keycode)
{
	int num = CheckHotkeyMatch<ScenarioEditorLandscapeGenerationWindow>(_terraform_editor_hotkeys, keycode, NULL, true);
	if (num == -1) return ES_NOT_HANDLED;
	Window *w = ShowEditorTerraformToolbar();
	if (w == NULL) return ES_NOT_HANDLED;
	return w->OnKeyPress(key, keycode);
}