/* $Id$ */

/*
 * 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 misc_gui.cpp GUIs for a number of misc windows. */

#include "stdafx.h"
#include "openttd.h"
#include "landscape.h"
#include "newgrf_text.h"
#include "saveload/saveload.h"
#include "gui.h"
#include "station_gui.h"
#include "viewport_func.h"
#include "gfx_func.h"
#include "station_func.h"
#include "command_func.h"
#include "company_func.h"
#include "town.h"
#include "network/network.h"
#include "network/network_content.h"
#include "company_base.h"
#include "texteff.hpp"
#include "cargotype.h"
#include "company_manager_face.h"
#include "strings_func.h"
#include "fileio_func.h"
#include "fios.h"
#include "zoom_func.h"
#include "window_func.h"
#include "tilehighlight_func.h"
#include "querystring_gui.h"

#include "table/strings.h"


/**
 * Try to retrive the current clipboard contents.
 *
 * @note OS-specific funtion.
 * @return True if some text could be retrived.
 */
bool GetClipboardContents(char *buffer, size_t buff_len);


/* Variables to display file lists */
SaveLoadDialogMode _saveload_mode;


static bool _fios_path_changed;
static bool _savegame_sort_dirty;
int _caret_timer;

/** Widgets for the land info window. */
enum LandInfoWidgets {
	LIW_BACKGROUND, ///< Background to draw on
};

static const NWidgetPart _nested_land_info_widgets[] = {
	NWidget(NWID_HORIZONTAL),
		NWidget(WWT_CLOSEBOX, COLOUR_GREY),
		NWidget(WWT_CAPTION, COLOUR_GREY), SetDataTip(STR_LAND_AREA_INFORMATION_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
	EndContainer(),
	NWidget(WWT_PANEL, COLOUR_GREY, LIW_BACKGROUND), EndContainer(),
};

static const WindowDesc _land_info_desc(
	WDP_AUTO, 0, 0,
	WC_LAND_INFO, WC_NONE,
	0,
	_nested_land_info_widgets, lengthof(_nested_land_info_widgets)
);

class LandInfoWindow : public Window {
	enum {
		LAND_INFO_CENTERED_LINES   = 12,                       ///< Up to 12 centered lines
		LAND_INFO_MULTICENTER_LINE = LAND_INFO_CENTERED_LINES, ///< One multicenter line
		LAND_INFO_LINE_END,

		LAND_INFO_LINE_BUFF_SIZE = 512,
	};

public:
	char landinfo_data[LAND_INFO_LINE_END][LAND_INFO_LINE_BUFF_SIZE];

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

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

		uint y = r.top + WD_TEXTPANEL_TOP;
		for (uint i = 0; i < LAND_INFO_CENTERED_LINES; i++) {
			if (StrEmpty(this->landinfo_data[i])) break;

			DrawString(r.left + WD_FRAMETEXT_LEFT, r.right - WD_FRAMETEXT_RIGHT, y, this->landinfo_data[i], i == 0 ? TC_LIGHT_BLUE : TC_FROMSTRING, SA_CENTER);
			y += FONT_HEIGHT_NORMAL + WD_PAR_VSEP_NORMAL;
			if (i == 0) y += 4;
		}

		if (!StrEmpty(this->landinfo_data[LAND_INFO_MULTICENTER_LINE])) {
			SetDParamStr(0, this->landinfo_data[LAND_INFO_MULTICENTER_LINE]);
			DrawStringMultiLine(r.left + WD_FRAMETEXT_LEFT, r.right - WD_FRAMETEXT_RIGHT, y, r.bottom - WD_TEXTPANEL_BOTTOM, STR_JUST_RAW_STRING, TC_FROMSTRING, SA_CENTER);
		}
	}

	virtual void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize)
	{
		if (widget != LIW_BACKGROUND) return;

		size->height = WD_TEXTPANEL_TOP + WD_TEXTPANEL_BOTTOM;
		for (uint i = 0; i < LAND_INFO_CENTERED_LINES; i++) {
			if (StrEmpty(this->landinfo_data[i])) break;

			uint width = GetStringBoundingBox(this->landinfo_data[i]).width + WD_FRAMETEXT_LEFT + WD_FRAMETEXT_RIGHT;
			size->width = max(size->width, width);

			size->height += FONT_HEIGHT_NORMAL + WD_PAR_VSEP_NORMAL;
			if (i == 0) size->height += 4;
		}

		if (!StrEmpty(this->landinfo_data[LAND_INFO_MULTICENTER_LINE])) {
			uint width = GetStringBoundingBox(this->landinfo_data[LAND_INFO_MULTICENTER_LINE]).width + WD_FRAMETEXT_LEFT + WD_FRAMETEXT_RIGHT;
			size->width = max(size->width, min(300u, width));
			SetDParamStr(0, this->landinfo_data[LAND_INFO_MULTICENTER_LINE]);
			size->height += GetStringHeight(STR_JUST_RAW_STRING, size->width - WD_FRAMETEXT_LEFT - WD_FRAMETEXT_RIGHT);
		}
	}

	LandInfoWindow(TileIndex tile) : Window() {
		Town *t = ClosestTownFromTile(tile, _settings_game.economy.dist_local_authority);

		/* Because build_date is not set yet in every TileDesc, we make sure it is empty */
		TileDesc td;

		td.build_date = INVALID_DATE;

		/* Most tiles have only one owner, but
		 *  - drivethrough roadstops can be build on town owned roads (up to 2 owners) and
		 *  - roads can have up to four owners (railroad, road, tram, 3rd-roadtype "highway").
		 */
		td.owner_type[0] = STR_LAND_AREA_INFORMATION_OWNER; // At least one owner is displayed, though it might be "N/A".
		td.owner_type[1] = STR_NULL;       // STR_NULL results in skipping the owner
		td.owner_type[2] = STR_NULL;
		td.owner_type[3] = STR_NULL;
		td.owner[0] = OWNER_NONE;
		td.owner[1] = OWNER_NONE;
		td.owner[2] = OWNER_NONE;
		td.owner[3] = OWNER_NONE;

		td.station_class = STR_NULL;
		td.station_name = STR_NULL;

		td.grf = NULL;

		CargoArray acceptance;
		AddAcceptedCargo(tile, acceptance, NULL);
		GetTileDesc(tile, &td);

		uint line_nr = 0;

		/* Tiletype */
		SetDParam(0, td.dparam[0]);
		GetString(this->landinfo_data[line_nr], td.str, lastof(this->landinfo_data[line_nr]));
		line_nr++;

		/* Up to four owners */
		for (uint i = 0; i < 4; i++) {
			if (td.owner_type[i] == STR_NULL) continue;

			SetDParam(0, STR_LAND_AREA_INFORMATION_OWNER_N_A);
			if (td.owner[i] != OWNER_NONE && td.owner[i] != OWNER_WATER) GetNameOfOwner(td.owner[i], tile);
			GetString(this->landinfo_data[line_nr], td.owner_type[i], lastof(this->landinfo_data[line_nr]));
			line_nr++;
		}

		/* Cost to clear/revenue when cleared */
		StringID str = STR_LAND_AREA_INFORMATION_COST_TO_CLEAR_N_A;
		Company *c = Company::GetIfValid(_local_company);
		if (c != NULL) {
			Money old_money = c->money;
			c->money = INT64_MAX;
			CommandCost costclear = DoCommand(tile, 0, 0, DC_NONE, CMD_LANDSCAPE_CLEAR);
			c->money = old_money;
			if (CmdSucceeded(costclear)) {
				Money cost = costclear.GetCost();
				if (cost < 0) {
					cost = -cost; // Negate negative cost to a positive revenue
					str = STR_LAND_AREA_INFORMATION_REVENUE_WHEN_CLEARED;
				} else {
					str = STR_LAND_AREA_INFORMATION_COST_TO_CLEAR;
				}
				SetDParam(0, cost);
			}
		}
		GetString(this->landinfo_data[line_nr], str, lastof(this->landinfo_data[line_nr]));
		line_nr++;

		/* Location */
		char tmp[16];
		snprintf(tmp, lengthof(tmp), "0x%.4X", tile);
		SetDParam(0, TileX(tile));
		SetDParam(1, TileY(tile));
		SetDParam(2, TileHeight(tile));
		SetDParamStr(3, tmp);
		GetString(this->landinfo_data[line_nr], STR_LAND_AREA_INFORMATION_LANDINFO_COORDS, lastof(this->landinfo_data[line_nr]));
		line_nr++;

		/* Local authority */
		SetDParam(0, STR_LAND_AREA_INFORMATION_LOCAL_AUTHORITY_NONE);
		if (t != NULL) {
			SetDParam(0, STR_TOWN_NAME);
			SetDParam(1, t->index);
		}
		GetString(this->landinfo_data[line_nr], STR_LAND_AREA_INFORMATION_LOCAL_AUTHORITY, lastof(this->landinfo_data[line_nr]));
		line_nr++;

		/* Build date */
		if (td.build_date != INVALID_DATE) {
			SetDParam(0, td.build_date);
			GetString(this->landinfo_data[line_nr], STR_LAND_AREA_INFORMATION_BUILD_DATE, lastof(this->landinfo_data[line_nr]));
			line_nr++;
		}

		/* Station class */
		if (td.station_class != STR_NULL) {
			SetDParam(0, td.station_class);
			GetString(this->landinfo_data[line_nr], STR_LAND_AREA_INFORMATION_STATION_CLASS, lastof(this->landinfo_data[line_nr]));
			line_nr++;
		}

		/* Station type name */
		if (td.station_name != STR_NULL) {
			SetDParam(0, td.station_name);
			GetString(this->landinfo_data[line_nr], STR_LAND_AREA_INFORMATION_STATION_TYPE, lastof(this->landinfo_data[line_nr]));
			line_nr++;
		}

		/* NewGRF name */
		if (td.grf != NULL) {
			SetDParamStr(0, td.grf);
			GetString(this->landinfo_data[line_nr], STR_LAND_AREA_INFORMATION_NEWGRF_NAME, lastof(this->landinfo_data[line_nr]));
			line_nr++;
		}

		assert(line_nr < LAND_INFO_CENTERED_LINES);

		/* Mark last line empty */
		this->landinfo_data[line_nr][0] = '\0';

		/* Cargo acceptance is displayed in a extra multiline */
		char *strp = GetString(this->landinfo_data[LAND_INFO_MULTICENTER_LINE], STR_LAND_AREA_INFORMATION_CARGO_ACCEPTED, lastof(this->landinfo_data[LAND_INFO_MULTICENTER_LINE]));
		bool found = false;

		for (CargoID i = 0; i < NUM_CARGO; ++i) {
			if (acceptance[i] > 0) {
				/* Add a comma between each item. */
				if (found) {
					*strp++ = ',';
					*strp++ = ' ';
				}
				found = true;

				/* If the accepted value is less than 8, show it in 1/8:ths */
				if (acceptance[i] < 8) {
					SetDParam(0, acceptance[i]);
					SetDParam(1, CargoSpec::Get(i)->name);
					strp = GetString(strp, STR_LAND_AREA_INFORMATION_CARGO_EIGHTS, lastof(this->landinfo_data[LAND_INFO_MULTICENTER_LINE]));
				} else {
					strp = GetString(strp, CargoSpec::Get(i)->name, lastof(this->landinfo_data[LAND_INFO_MULTICENTER_LINE]));
				}
			}
		}
		if (!found) this->landinfo_data[LAND_INFO_MULTICENTER_LINE][0] = '\0';

		this->InitNested(&_land_info_desc);

#if defined(_DEBUG)
#	define LANDINFOD_LEVEL 0
#else
#	define LANDINFOD_LEVEL 1
#endif
		DEBUG(misc, LANDINFOD_LEVEL, "TILE: %#x (%i,%i)", tile, TileX(tile), TileY(tile));
		DEBUG(misc, LANDINFOD_LEVEL, "type_height  = %#x", _m[tile].type_height);
		DEBUG(misc, LANDINFOD_LEVEL, "m1           = %#x", _m[tile].m1);
		DEBUG(misc, LANDINFOD_LEVEL, "m2           = %#x", _m[tile].m2);
		DEBUG(misc, LANDINFOD_LEVEL, "m3           = %#x", _m[tile].m3);
		DEBUG(misc, LANDINFOD_LEVEL, "m4           = %#x", _m[tile].m4);
		DEBUG(misc, LANDINFOD_LEVEL, "m5           = %#x", _m[tile].m5);
		DEBUG(misc, LANDINFOD_LEVEL, "m6           = %#x", _m[tile].m6);
		DEBUG(misc, LANDINFOD_LEVEL, "m7           = %#x", _me[tile].m7);
#undef LANDINFOD_LEVEL
	}
};

static void Place_LandInfo(TileIndex tile)
{
	DeleteWindowById(WC_LAND_INFO, 0);
	new LandInfoWindow(tile);
}

void PlaceLandBlockInfo()
{
	if (_cursor.sprite == SPR_CURSOR_QUERY) {
		ResetObjectToPlace();
	} else {
		_place_proc = Place_LandInfo;
		SetObjectToPlace(SPR_CURSOR_QUERY, PAL_NONE, HT_RECT, WC_MAIN_TOOLBAR, 0);
	}
}

/** Widgets for the land info window. */
enum AboutWidgets {
	AW_SCROLLING_TEXT,       ///< The actually scrolling text
	AW_WEBSITE,              ///< URL of OpenTTD website
};

static const NWidgetPart _nested_about_widgets[] = {
	NWidget(NWID_HORIZONTAL),
		NWidget(WWT_CLOSEBOX, COLOUR_GREY),
		NWidget(WWT_CAPTION, COLOUR_GREY), SetDataTip(STR_ABOUT_OPENTTD, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
	EndContainer(),
	NWidget(WWT_PANEL, COLOUR_GREY), SetPIP(4, 2, 4),
		NWidget(WWT_LABEL, COLOUR_GREY), SetDataTip(STR_ABOUT_ORIGINAL_COPYRIGHT, STR_NULL),
		NWidget(WWT_LABEL, COLOUR_GREY), SetDataTip(STR_ABOUT_VERSION, STR_NULL),
		NWidget(WWT_FRAME, COLOUR_GREY), SetPadding(0, 5, 1, 5),
			NWidget(WWT_EMPTY, INVALID_COLOUR, AW_SCROLLING_TEXT),
		EndContainer(),
		NWidget(WWT_LABEL, COLOUR_GREY, AW_WEBSITE), SetDataTip(STR_BLACK_RAW_STRING, STR_NULL),
		NWidget(WWT_LABEL, COLOUR_GREY), SetDataTip(STR_ABOUT_COPYRIGHT_OPENTTD, STR_NULL),
	EndContainer(),
};

static const WindowDesc _about_desc(
	WDP_CENTER, 0, 0,
	WC_GAME_OPTIONS, WC_NONE,
	0,
	_nested_about_widgets, lengthof(_nested_about_widgets)
);

static const char * const _credits[] = {
	"Original design by Chris Sawyer",
	"Original graphics by Simon Foster",
	"",
	"The OpenTTD team (in alphabetical order):",
	"  Albert Hofkamp (Alberth) - GUI expert",
	"  Jean-Francois Claeys (Belugas) - GUI, newindustries and more",
	"  Bjarni Corfitzen (Bjarni) - MacOSX port, coder and vehicles",
	"  Matthijs Kooijman (blathijs) - Pathfinder-guru, pool rework",
	"  Victor Fischer (Celestar) - Programming everywhere you need him to",
	"  Christoph Elsenhans (frosch) - General coding",
	"  Lo\xC3\xAF""c Guilloux (glx) - Windows Expert",
	"  Michael Lutz (michi_cc) - Path based signals",
	"  Owen Rudge (orudge) - Forum host, OS/2 port",
	"  Peter Nelson (peter1138) - Spiritual descendant from newGRF gods",
	"  Remko Bijker (Rubidium) - Lead coder and way more",
	"  Zden\xC4\x9Bk Sojka (SmatZ) - Bug finder and fixer",
	"  Thijs Marinussen (Yexo) - AI Framework",
	"",
	"Inactive Developers:",
	"  Tam\xC3\xA1s Farag\xC3\xB3 (Darkvater) - Ex-Lead coder",
	"  Jaroslav Mazanec (KUDr) - YAPG (Yet Another Pathfinder God) ;)",
	"  Jonathan Coome (Maedhros) - High priest of the NewGRF Temple",
	"  Attila B\xC3\xA1n (MiHaMiX) - Developer WebTranslator 1 and 2",
	"  Christoph Mallon (Tron) - Programmer, code correctness police",
	"",
	"Retired Developers:",
	"  Ludvig Strigeus (ludde) - OpenTTD author, main coder (0.1 - 0.3.3)",
	"  Serge Paquet (vurlix) - Assistant project manager, coder (0.1 - 0.3.3)",
	"  Dominik Scherer (dominik81) - Lead programmer, GUI expert (0.3.0 - 0.3.6)",
	"  Benedikt Br\xC3\xBCggemeier (skidd13) - Bug fixer and code reworker",
	"  Patric Stout (TrueLight) - Programmer (0.3 - pre0.7), sys op (active)",
	"",
	"Special thanks go out to:",
	"  Josef Drexler - For his great work on TTDPatch",
	"  Marcin Grzegorczyk - For his documentation of TTD internals",
	"  Petr Baudi\xC5\xA1 (pasky) - Many patches, newGRF support",
	"  Stefan Mei\xC3\x9Fner (sign_de) - For his work on the console",
	"  Simon Sasburg (HackyKid) - Many bugfixes he has blessed us with",
	"  Cian Duffy (MYOB) - BeOS port / manual writing",
	"  Christian Rosentreter (tokai) - MorphOS / AmigaOS port",
	"  Richard Kempton (richK) - additional airports, initial TGP implementation",
	"",
	"  Alberto Demichelis - Squirrel scripting language \xC2\xA9 2003-2008",
	"  Markus F.X.J. Oberhumer - (Mini)LZO for loading old savegames \xC2\xA9 1996-2008",
	"  L. Peter Deutsch - MD5 implementation \xC2\xA9 1999, 2000, 2002",
	"  Michael Blunck - Pre-Signals and Semaphores \xC2\xA9 2003",
	"  George - Canal/Lock graphics \xC2\xA9 2003-2004",
	"  David Dallaston - Tram tracks",
	"  Marcin Grzegorczyk - Foundations for Tracks on Slopes",
	"  All Translators - Who made OpenTTD a truly international game",
	"  Bug Reporters - Without whom OpenTTD would still be full of bugs!",
	"",
	"",
	"And last but not least:",
	"  Chris Sawyer - For an amazing game!"
};

struct AboutWindow : public Window {
	int text_position;                       ///< The top of the scrolling text
	byte counter;                            ///< Used to scroll the text every 5 ticks
	int line_height;                         ///< The height of a single line
	static const int num_visible_lines = 19; ///< The number of lines visible simultaneously

	AboutWindow() : Window()
	{
		this->InitNested(&_about_desc);

		this->counter = 5;
		this->text_position = this->GetWidget<NWidgetBase>(AW_SCROLLING_TEXT)->pos_y + this->GetWidget<NWidgetBase>(AW_SCROLLING_TEXT)->current_y;
	}

	virtual void SetStringParameters(int widget) const
	{
		if (widget == AW_WEBSITE) SetDParamStr(0, "Website: http://www.openttd.org");
	}

	virtual void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize)
	{
		if (widget != AW_SCROLLING_TEXT) return;

		this->line_height = FONT_HEIGHT_NORMAL;

		Dimension d;
		d.height = this->line_height * num_visible_lines;

		d.width = 0;
		for (uint i = 0; i < lengthof(_credits); i++) {
			d.width = max(d.width, GetStringBoundingBox(_credits[i]).width);
		}
		*size = maxdim(*size, d);
	}

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

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

		int y = this->text_position;

		/* Show all scrolling _credits */
		for (uint i = 0; i < lengthof(_credits); i++) {
			if (y >= r.top + 7 && y < r.bottom - this->line_height) {
				DrawString(r.left, r.right, y, _credits[i], TC_BLACK, SA_LEFT | SA_FORCE);
			}
			y += this->line_height;
		}
	}

	virtual void OnTick()
	{
		if (--this->counter == 0) {
			this->counter = 5;
			this->text_position--;
			/* If the last text has scrolled start a new from the start */
			if (this->text_position < (int)(this->GetWidget<NWidgetBase>(AW_SCROLLING_TEXT)->pos_y - lengthof(_credits) * this->line_height)) {
				this->text_position = this->GetWidget<NWidgetBase>(AW_SCROLLING_TEXT)->pos_y + this->GetWidget<NWidgetBase>(AW_SCROLLING_TEXT)->current_y;
			}
			this->SetDirty();
		}
	}
};

void ShowAboutWindow()
{
	DeleteWindowById(WC_GAME_OPTIONS, 0);
	new AboutWindow();
}

/** Widgets of the error message windows */
enum ErrorMessageWidgets {
	EMW_CAPTION,
	EMW_FACE,
	EMW_MESSAGE,
};

static const NWidgetPart _nested_errmsg_widgets[] = {
	NWidget(NWID_HORIZONTAL),
		NWidget(WWT_CLOSEBOX, COLOUR_RED),
		NWidget(WWT_CAPTION, COLOUR_RED, EMW_CAPTION), SetDataTip(STR_ERROR_MESSAGE_CAPTION, STR_NULL),
	EndContainer(),
	NWidget(WWT_PANEL, COLOUR_RED),
		NWidget(WWT_EMPTY, COLOUR_RED, EMW_MESSAGE), SetPadding(0, 2, 0, 2), SetMinimalSize(236, 32),
	EndContainer(),
};

static const WindowDesc _errmsg_desc(
	WDP_MANUAL, 0, 0,
	WC_ERRMSG, WC_NONE,
	0,
	_nested_errmsg_widgets, lengthof(_nested_errmsg_widgets)
);

static const NWidgetPart _nested_errmsg_face_widgets[] = {
	NWidget(NWID_HORIZONTAL),
		NWidget(WWT_CLOSEBOX, COLOUR_RED),
		NWidget(WWT_CAPTION, COLOUR_RED, EMW_CAPTION), SetDataTip(STR_ERROR_MESSAGE_CAPTION_OTHER_COMPANY, STR_NULL),
	EndContainer(),
	NWidget(WWT_PANEL, COLOUR_RED),
		NWidget(NWID_HORIZONTAL), SetPIP(2, 1, 2),
			NWidget(WWT_EMPTY, COLOUR_RED, EMW_FACE), SetMinimalSize(91, 120), SetFill(0, 1), SetPadding(2, 0, 1, 0),
			NWidget(WWT_EMPTY, COLOUR_RED, EMW_MESSAGE), SetFill(0, 1), SetMinimalSize(238, 123),
		EndContainer(),
	EndContainer(),
};

static const WindowDesc _errmsg_face_desc(
	WDP_MANUAL, 0, 0,
	WC_ERRMSG, WC_NONE,
	0,
	_nested_errmsg_face_widgets, lengthof(_nested_errmsg_face_widgets)
);

/** Window class for displaying an error message window. */
struct ErrmsgWindow : public Window {
private:
	uint duration;                  ///< Length of display of the message. 0 means forever,
	uint64 decode_params[20];       ///< Parameters of the message strings.
	StringID summary_msg;           ///< General error message showed in first line. Must be valid.
	StringID detailed_msg;          ///< Detailed error message showed in second line. Can be #INVALID_STRING_ID.
	uint height_summary;            ///< Height of the #summary_msg string in pixels in the #EMW_MESSAGE widget.
	uint height_detailed;           ///< Height of the #detailed_msg string in pixels in the #EMW_MESSAGE widget.
	Point position;                 ///< Position of the error message window.

public:
	ErrmsgWindow(Point pt, const WindowDesc *desc, StringID summary_msg, StringID detailed_msg, bool no_timeout) : Window()
	{
		this->position = pt;
		this->duration = no_timeout ? 0 : _settings_client.gui.errmsg_duration;
		CopyOutDParam(this->decode_params, 0, lengthof(this->decode_params));
		this->summary_msg  = summary_msg;
		this->detailed_msg = detailed_msg;

		assert(summary_msg != INVALID_STRING_ID);

		this->InitNested(desc);
	}

	virtual void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize)
	{
		if (widget != EMW_MESSAGE) return;

		CopyInDParam(0, this->decode_params, lengthof(this->decode_params));
		/* If the error message comes from a NewGRF, we must use the text ref. stack reserved for error messages.
		 * If the message doesn't come from a NewGRF, it won't use the TTDP-style text ref. stack, so we won't hurt anything
		 */
		SwitchToErrorRefStack();
		RewindTextRefStack();

		int text_width = max(0, (int)size->width - WD_FRAMETEXT_LEFT - WD_FRAMETEXT_RIGHT);
		this->height_summary  = GetStringHeight(this->summary_msg, text_width);
		this->height_detailed = (this->detailed_msg == INVALID_STRING_ID) ? 0 : GetStringHeight(this->detailed_msg, text_width);

		SwitchToNormalRefStack(); // Switch back to the normal text ref. stack for NewGRF texts.

		uint panel_height = WD_FRAMERECT_TOP + this->height_summary + WD_FRAMERECT_BOTTOM;
		if (this->detailed_msg != INVALID_STRING_ID) panel_height += this->height_detailed + WD_PAR_VSEP_WIDE;

		size->height = max(size->height, panel_height);
	}

	virtual Point OnInitialPosition(const WindowDesc *desc, int16 sm_width, int16 sm_height, int window_number)
	{
		/* Position (0, 0) given, center the window. */
		if (this->position.x == 0 && this->position.y == 0) {
			Point pt = {(_screen.width - sm_width) >> 1, (_screen.height - sm_height) >> 1};
			return pt;
		}

		/* Find the free screen space between the main toolbar at the top, and the statusbar at the bottom.
		 * Add a fixed distance 20 to make it less cluttered.
		 */
		int scr_top = GetMainViewTop() + 20;
		int scr_bot = GetMainViewBottom() - 20;

		Point pt = RemapCoords2(this->position.x, this->position.y);
		const ViewPort *vp = FindWindowById(WC_MAIN_WINDOW, 0)->viewport;
		if (this->detailed_msg != STR_ERROR_OWNED_BY || GetDParamX(this->decode_params, 2) >= MAX_COMPANIES) {
			/* move x pos to opposite corner */
			pt.x = UnScaleByZoom(pt.x - vp->virtual_left, vp->zoom) + vp->left;
			pt.x = (pt.x < (_screen.width >> 1)) ? _screen.width - sm_width - 20 : 20; // Stay 20 pixels away from the edge of the screen.

			/* move y pos to opposite corner */
			pt.y = UnScaleByZoom(pt.y - vp->virtual_top, vp->zoom) + vp->top;
			pt.y = (pt.y < (_screen.height >> 1)) ? scr_bot - sm_height : scr_top;
		} else {
			pt.x = Clamp(UnScaleByZoom(pt.x - vp->virtual_left, vp->zoom) + vp->left - (sm_width / 2),  0, _screen.width  - sm_width);
			pt.y = Clamp(UnScaleByZoom(pt.y - vp->virtual_top,  vp->zoom) + vp->top  - (sm_height / 2), scr_top, scr_bot - sm_height);
		}
		return pt;
	}

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

	virtual void SetStringParameters(int widget) const
	{
		if (widget == EMW_CAPTION) CopyInDParam(0, this->decode_params, lengthof(this->decode_params));
	}

	virtual void DrawWidget(const Rect &r, int widget) const
	{
		switch (widget) {
			case EMW_FACE: {
				const Company *c = Company::Get((CompanyID)GetDParamX(this->decode_params, 2));
				DrawCompanyManagerFace(c->face, c->colour, r.left, r.top);
				break;
			}

			case EMW_MESSAGE:
				CopyInDParam(0, this->decode_params, lengthof(this->decode_params));
				SwitchToErrorRefStack();
				RewindTextRefStack();

				if (this->detailed_msg == INVALID_STRING_ID) {
					DrawStringMultiLine(r.left + WD_FRAMETEXT_LEFT, r.right - WD_FRAMETEXT_RIGHT, r.top + WD_FRAMERECT_TOP, r.bottom - WD_FRAMERECT_BOTTOM,
							this->summary_msg, TC_FROMSTRING, SA_CENTER);
				} else {
					int extra = (r.bottom - r.top + 1 - this->height_summary - this->height_detailed - WD_PAR_VSEP_WIDE) / 2;

					int top = r.top + WD_FRAMERECT_TOP;
					int bottom = top + this->height_summary + extra;
					DrawStringMultiLine(r.left + WD_FRAMETEXT_LEFT, r.right - WD_FRAMETEXT_RIGHT, top, bottom, this->summary_msg, TC_FROMSTRING, SA_CENTER);

					bottom = r.bottom - WD_FRAMERECT_BOTTOM;
					top = bottom - this->height_detailed - extra;
					DrawStringMultiLine(r.left + WD_FRAMETEXT_LEFT, r.right - WD_FRAMETEXT_RIGHT, top, bottom, this->detailed_msg, TC_FROMSTRING, SA_CENTER);
				}

				SwitchToNormalRefStack(); // Switch back to the normal text ref. stack for NewGRF texts.
				break;

			default:
				break;
		}
	}

	virtual void OnMouseLoop()
	{
		/* Disallow closing the window too easily, if timeout is disabled */
		if (_right_button_down && this->duration != 0) delete this;
	}

	virtual void OnHundredthTick()
	{
		/* Timeout enabled? */
		if (this->duration != 0) {
			this->duration--;
			if (this->duration == 0) delete this;
		}
	}

	~ErrmsgWindow()
	{
		SetRedErrorSquare(INVALID_TILE);
		extern StringID _switch_mode_errorstr;
		_switch_mode_errorstr = INVALID_STRING_ID;
	}

	virtual EventState OnKeyPress(uint16 key, uint16 keycode)
	{
		if (keycode != WKC_SPACE) return ES_NOT_HANDLED;
		delete this;
		return ES_HANDLED;
	}
};

/**
 * Display an error message in a window.
 * @param summary_msg  General error message showed in first line. Must be valid.
 * @param detailed_msg Detailed error message showed in second line. Can be INVALID_STRING_ID.
 * @param x            World X position (TileVirtX) of the error location. Set both x and y to 0 to just center the message when there is no related error tile.
 * @param y            World Y position (TileVirtY) of the error location. Set both x and y to 0 to just center the message when there is no related error tile.
 * @param no_timeout   Set to true, if the message is that important that it should not close automatically after some time.
 */
void ShowErrorMessage(StringID summary_msg, StringID detailed_msg, int x, int y, bool no_timeout)
{
	DeleteWindowById(WC_ERRMSG, 0);

	if (_settings_client.gui.errmsg_duration == 0 && !no_timeout) return;

	if (summary_msg == STR_NULL) summary_msg = STR_EMPTY;

	Point pt = {x, y};
	const WindowDesc *desc = (detailed_msg != STR_ERROR_OWNED_BY || GetDParam(2) >= MAX_COMPANIES) ? &_errmsg_desc : &_errmsg_face_desc;
	new ErrmsgWindow(pt, desc, summary_msg, detailed_msg, no_timeout);
}

void ShowEstimatedCostOrIncome(Money cost, int x, int y)
{
	StringID msg = STR_MESSAGE_ESTIMATED_COST;

	if (cost < 0) {
		cost = -cost;
		msg = STR_MESSAGE_ESTIMATED_INCOME;
	}
	SetDParam(0, cost);
	ShowErrorMessage(msg, INVALID_STRING_ID, x, y);
}

void ShowCostOrIncomeAnimation(int x, int y, int z, Money cost)
{
	Point pt = RemapCoords(x, y, z);
	StringID msg = STR_INCOME_FLOAT_COST;

	if (cost < 0) {
		cost = -cost;
		msg = STR_INCOME_FLOAT_INCOME;
	}
	SetDParam(0, cost);
	AddTextEffect(msg, pt.x, pt.y, DAY_TICKS, TE_RISING);
}

void ShowFeederIncomeAnimation(int x, int y, int z, Money cost)
{
	Point pt = RemapCoords(x, y, z);

	SetDParam(0, cost);
	AddTextEffect(STR_FEEDER, pt.x, pt.y, DAY_TICKS, TE_RISING);
}

TextEffectID ShowFillingPercent(int x, int y, int z, uint8 percent, StringID string)
{
	Point pt = RemapCoords(x, y, z);

	assert(string != STR_NULL);

	SetDParam(0, percent);
	return AddTextEffect(string, pt.x, pt.y, 0, TE_STATIC);
}

void UpdateFillingPercent(TextEffectID te_id, uint8 percent, StringID string)
{
	assert(string != STR_NULL);

	SetDParam(0, percent);
	UpdateTextEffect(te_id, string);
}

void HideFillingPercent(TextEffectID *te_id)
{
	if (*te_id == INVALID_TE_ID) return;

	RemoveTextEffect(*te_id);
	*te_id = INVALID_TE_ID;
}

static const NWidgetPart _nested_tooltips_widgets[] = {
	NWidget(WWT_PANEL, COLOUR_GREY, 0), SetMinimalSize(200, 32), EndContainer(),
};

static const WindowDesc _tool_tips_desc(
	WDP_MANUAL, 0, 0, // Coordinates and sizes are not used,
	WC_TOOLTIPS, WC_NONE,
	0,
	_nested_tooltips_widgets, lengthof(_nested_tooltips_widgets)
);

/** Window for displaying a tooltip. */
struct TooltipsWindow : public Window
{
	StringID string_id;         ///< String to display as tooltip.
	byte paramcount;            ///< Number of string parameters in #string_id.
	uint64 params[5];           ///< The string parameters.
	bool use_left_mouse_button; ///< Wait for left mouse button to close window (else, wait for right button).

	TooltipsWindow(StringID str, uint paramcount, const uint64 params[], bool use_left_mouse_button) : Window()
	{
		this->string_id = str;
		assert_compile(sizeof(this->params[0]) == sizeof(params[0]));
		assert(paramcount <= lengthof(this->params));
		memcpy(this->params, params, sizeof(this->params[0]) * paramcount);
		this->paramcount = paramcount;
		this->use_left_mouse_button = use_left_mouse_button;

		this->InitNested(&_tool_tips_desc);

		this->flags4 &= ~WF_WHITE_BORDER_MASK; // remove white-border from tooltip
	}

	virtual Point OnInitialPosition(const WindowDesc *desc, int16 sm_width, int16 sm_height, int window_number)
	{
		/* Find the free screen space between the main toolbar at the top, and the statusbar at the bottom.
		 * Add a fixed distance 2 so the tooltip floats free from both bars.
		 */
		int scr_top = GetMainViewTop() + 2;
		int scr_bot = GetMainViewBottom() - 2;

		Point pt;

		/* Correctly position the tooltip position, watch out for window and cursor size
		 * Clamp value to below main toolbar and above statusbar. If tooltip would
		 * go below window, flip it so it is shown above the cursor */
		pt.y = Clamp(_cursor.pos.y + _cursor.size.y + _cursor.offs.y + 5, scr_top, scr_bot);
		if (pt.y + sm_height > scr_bot) pt.y = min(_cursor.pos.y + _cursor.offs.y - 5, scr_bot) - sm_height;
		pt.x = Clamp(_cursor.pos.x - (sm_width >> 1), 0, _screen.width - sm_width);

		return pt;
	}

	virtual void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize)
	{
		/* There is only one widget. */
		for (uint i = 0; i != this->paramcount; i++) SetDParam(i, this->params[i]);

		size->width  = min(GetStringBoundingBox(this->string_id).width, 194);
		size->height = GetStringHeight(this->string_id, size->width);

		/* Increase slightly to have some space around the box. */
		size->width  += 2 + WD_FRAMERECT_LEFT + WD_FRAMERECT_RIGHT;
		size->height += 2 + WD_FRAMERECT_TOP + WD_FRAMERECT_BOTTOM;
	}

	virtual void DrawWidget(const Rect &r, int widget) const
	{
		/* There is only one widget. */
		GfxFillRect(r.left, r.top, r.right, r.bottom, 0);
		GfxFillRect(r.left + 1, r.top + 1, r.right - 1, r.bottom - 1, 0x44);

		for (uint arg = 0; arg < this->paramcount; arg++) {
			SetDParam(arg, this->params[arg]);
		}
		DrawStringMultiLine(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, r.top + WD_FRAMERECT_TOP, r.bottom - WD_FRAMERECT_BOTTOM, this->string_id, TC_FROMSTRING, SA_CENTER);
	}


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

	virtual void OnMouseLoop()
	{
		/* We can show tooltips while dragging tools. These are shown as long as
		 * we are dragging the tool. Normal tooltips work with rmb */
		if (this->use_left_mouse_button ? !_left_button_down : !_right_button_down) delete this;
	}
};

/** Shows a tooltip
 * @param str String to be displayed
 * @param paramcount number of params to deal with
 * @param params (optional) up to 5 pieces of additional information that may be added to a tooltip
 * @param use_left_mouse_button close the tooltip when the left (true) or right (false) mousebutton is released
 */
void GuiShowTooltips(StringID str, uint paramcount, const uint64 params[], bool use_left_mouse_button)
{
	DeleteWindowById(WC_TOOLTIPS, 0);

	if (str == STR_NULL) return;

	new TooltipsWindow(str, paramcount, params, use_left_mouse_button);
}

/**
 * Draw a (multi)line of cargos seperated by commas, and prefixed with a string.
 * @param cargo_mask Mask of cargos to include in the list.
 * @param r          Rectangle to draw the cargos in.
 * @param prefix     String to use as prefix for the list of cargos.
 * @return Bottom position of the last line used for drawing the cargos.
 */
int DrawCargoListText(uint32 cargo_mask, const Rect &r, StringID prefix)
{
	bool first = true;
	char string[512];
	char *b = InlineString(string, prefix);

	for (CargoID i = 0; i < NUM_CARGO; i++) {
		if (b >= lastof(string) - (1 + 2 * 4)) break; // ',' or ' ' and two calls to Utf8Encode()
		if (HasBit(cargo_mask, i)) {
			if (first) {
				first = false;
			} else {
				/* Add a comma if this is not the first item */
				*b++ = ',';
				*b++ = ' ';
			}
			b = InlineString(b, CargoSpec::Get(i)->name);
		}
	}

	/* If first is still true then no cargo is accepted */
	if (first) b = InlineString(b, STR_JUST_NOTHING);

	*b = '\0';

	/* Make sure we detect any buffer overflow */
	assert(b < endof(string));

	SetDParamStr(0, string);
	return DrawStringMultiLine(r.left, r.right, r.top, r.bottom, STR_JUST_RAW_STRING);
}

/**
 * Calculates and draws the accepted or supplied cargo around the selected tile(s)
 * @param left x position where the string is to be drawn
 * @param right the right most position to draw on
 * @param top y position where the string is to be drawn
 * @param sct which type of cargo is to be displayed (passengers/non-passengers)
 * @param rad radius around selected tile(s) to be searched
 * @param supplies if supplied cargos should be drawn, else accepted cargos
 * @return Returns the y value below the string that was drawn
 */
int DrawStationCoverageAreaText(int left, int right, int top, StationCoverageType sct, int rad, bool supplies)
{
	TileIndex tile = TileVirtXY(_thd.pos.x, _thd.pos.y);
	if (tile < MapSize()) {
		CargoArray cargos;
		if (supplies) {
			cargos = GetProductionAroundTiles(tile, _thd.size.x / TILE_SIZE, _thd.size.y / TILE_SIZE, rad);
		} else {
			cargos = GetAcceptanceAroundTiles(tile, _thd.size.x / TILE_SIZE, _thd.size.y / TILE_SIZE, rad);
		}

		/* Convert cargo counts to a set of cargo bits, and draw the result. */
		uint32 cargo_mask = 0;
		for (CargoID i = 0; i < NUM_CARGO; i++) {
			switch (sct) {
				case SCT_PASSENGERS_ONLY: if (!IsCargoInClass(i, CC_PASSENGERS)) continue; break;
				case SCT_NON_PASSENGERS_ONLY: if (IsCargoInClass(i, CC_PASSENGERS)) continue; break;
				case SCT_ALL: break;
				default: NOT_REACHED();
			}
			if (cargos[i] >= (supplies ? 1U : 8U)) SetBit(cargo_mask, i);
		}
		Rect r = {left, top, right, INT32_MAX};
		return DrawCargoListText(cargo_mask, r, supplies ? STR_STATION_BUILD_SUPPLIES_CARGO : STR_STATION_BUILD_ACCEPTS_CARGO);
	}

	return top;
}

void CheckRedrawStationCoverage(const Window *w)
{
	if (_thd.dirty & 1) {
		_thd.dirty &= ~1;
		w->SetDirty();
	}
}

/* Delete a character at the caret position in a text buf.
 * If backspace is set, delete the character before the caret,
 * else delete the character after it. */
static void DelChar(Textbuf *tb, bool backspace)
{
	WChar c;
	char *s = tb->buf + tb->caretpos;

	if (backspace) s = Utf8PrevChar(s);

	uint16 len = (uint16)Utf8Decode(&c, s);
	uint width = GetCharacterWidth(FS_NORMAL, c);

	tb->width  -= width;
	if (backspace) {
		tb->caretpos   -= len;
		tb->caretxoffs -= width;
	}

	/* Move the remaining characters over the marker */
	memmove(s, s + len, tb->size - (s - tb->buf) - len);
	tb->size -= len;
}

/**
 * Delete a character from a textbuffer, either with 'Delete' or 'Backspace'
 * The character is delete from the position the caret is at
 * @param tb Textbuf type to be changed
 * @param delmode Type of deletion, either WKC_BACKSPACE or WKC_DELETE
 * @return Return true on successful change of Textbuf, or false otherwise
 */
bool DeleteTextBufferChar(Textbuf *tb, int delmode)
{
	if (delmode == WKC_BACKSPACE && tb->caretpos != 0) {
		DelChar(tb, true);
		return true;
	} else if (delmode == WKC_DELETE && tb->caretpos < tb->size - 1) {
		DelChar(tb, false);
		return true;
	}

	return false;
}

/**
 * Delete every character in the textbuffer
 * @param tb Textbuf buffer to be emptied
 */
void DeleteTextBufferAll(Textbuf *tb)
{
	memset(tb->buf, 0, tb->maxsize);
	tb->size = 1;
	tb->width = tb->caretpos = tb->caretxoffs = 0;
}

/**
 * Insert a character to a textbuffer. If maxwidth of the Textbuf is zero,
 * we don't care about the visual-length but only about the physical
 * length of the string
 * @param tb Textbuf type to be changed
 * @param key Character to be inserted
 * @return Return true on successful change of Textbuf, or false otherwise
 */
bool InsertTextBufferChar(Textbuf *tb, WChar key)
{
	const byte charwidth = GetCharacterWidth(FS_NORMAL, key);
	uint16 len = (uint16)Utf8CharLen(key);
	if (tb->size + len <= tb->maxsize && (tb->maxwidth == 0 || tb->width + charwidth <= tb->maxwidth)) {
		memmove(tb->buf + tb->caretpos + len, tb->buf + tb->caretpos, tb->size - tb->caretpos);
		Utf8Encode(tb->buf + tb->caretpos, key);
		tb->size  += len;
		tb->width += charwidth;

		tb->caretpos   += len;
		tb->caretxoffs += charwidth;
		return true;
	}
	return false;
}

/**
 * Insert a chunk of text from the clipboard onto the textbuffer. Get TEXT clipboard
 * and append this up to the maximum length (either absolute or screenlength). If maxlength
 * is zero, we don't care about the screenlength but only about the physical length of the string
 * @param tb Textbuf type to be changed
 * @return true on successful change of Textbuf, or false otherwise
 */
bool InsertTextBufferClipboard(Textbuf *tb)
{
	char utf8_buf[512];

	if (!GetClipboardContents(utf8_buf, lengthof(utf8_buf))) return false;

	uint16 width = 0, length = 0;
	WChar c;
	for (const char *ptr = utf8_buf; (c = Utf8Consume(&ptr)) != '\0';) {
		if (!IsPrintable(c)) break;

		byte len = Utf8CharLen(c);
		if (tb->size + length + len > tb->maxsize) break;

		byte charwidth = GetCharacterWidth(FS_NORMAL, c);
		if (tb->maxwidth != 0 && width + tb->width + charwidth > tb->maxwidth) break;

		width += charwidth;
		length += len;
	}

	if (length == 0) return false;

	memmove(tb->buf + tb->caretpos + length, tb->buf + tb->caretpos, tb->size - tb->caretpos);
	memcpy(tb->buf + tb->caretpos, utf8_buf, length);
	tb->width += width;
	tb->caretxoffs += width;

	tb->size += length;
	tb->caretpos += length;
	assert(tb->size <= tb->maxsize);
	tb->buf[tb->size - 1] = '\0'; // terminating zero

	return true;
}

/**
 * Handle text navigation with arrow keys left/right.
 * This defines where the caret will blink and the next characer interaction will occur
 * @param tb Textbuf type where navigation occurs
 * @param navmode Direction in which navigation occurs WKC_LEFT, WKC_RIGHT, WKC_END, WKC_HOME
 * @return Return true on successful change of Textbuf, or false otherwise
 */
bool MoveTextBufferPos(Textbuf *tb, int navmode)
{
	switch (navmode) {
		case WKC_LEFT:
			if (tb->caretpos != 0) {
				WChar c;
				const char *s = Utf8PrevChar(tb->buf + tb->caretpos);
				Utf8Decode(&c, s);
				tb->caretpos    = s - tb->buf; // -= (tb->buf + tb->caretpos - s)
				tb->caretxoffs -= GetCharacterWidth(FS_NORMAL, c);

				return true;
			}
			break;

		case WKC_RIGHT:
			if (tb->caretpos < tb->size - 1) {
				WChar c;

				tb->caretpos   += (uint16)Utf8Decode(&c, tb->buf + tb->caretpos);
				tb->caretxoffs += GetCharacterWidth(FS_NORMAL, c);

				return true;
			}
			break;

		case WKC_HOME:
			tb->caretpos = 0;
			tb->caretxoffs = 0;
			return true;

		case WKC_END:
			tb->caretpos = tb->size - 1;
			tb->caretxoffs = tb->width;
			return true;

		default:
			break;
	}

	return false;
}

/**
 * Initialize the textbuffer by supplying it the buffer to write into
 * and the maximum length of this buffer
 * @param tb Textbuf type which is getting initialized
 * @param buf the buffer that will be holding the data for input
 * @param maxsize maximum size in bytes, including terminating '\0'
 * @param maxwidth maximum length in pixels of this buffer. If reached, buffer
 * cannot grow, even if maxsize would allow because there is space. Width
 * of zero '0' means the buffer is only restricted by maxsize */
void InitializeTextBuffer(Textbuf *tb, char *buf, uint16 maxsize, uint16 maxwidth)
{
	assert(maxsize != 0);

	tb->buf      = buf;
	tb->maxsize  = maxsize;
	tb->maxwidth = maxwidth;
	tb->caret    = true;
	UpdateTextBufferSize(tb);
}

/**
 * Update Textbuf type with its actual physical character and screenlength
 * Get the count of characters in the string as well as the width in pixels.
 * Useful when copying in a larger amount of text at once
 * @param tb Textbuf type which length is calculated
 */
void UpdateTextBufferSize(Textbuf *tb)
{
	const char *buf = tb->buf;

	tb->width = 0;
	tb->size = 1; // terminating zero

	WChar c;
	while ((c = Utf8Consume(&buf)) != '\0') {
		tb->width += GetCharacterWidth(FS_NORMAL, c);
		tb->size += Utf8CharLen(c);
	}

	assert(tb->size <= tb->maxsize);

	tb->caretpos = tb->size - 1;
	tb->caretxoffs = tb->width;
}

bool HandleCaret(Textbuf *tb)
{
	/* caret changed? */
	bool b = !!(_caret_timer & 0x20);

	if (b != tb->caret) {
		tb->caret = b;
		return true;
	}
	return false;
}

bool QueryString::HasEditBoxFocus(const Window *w, int wid) const
{
	if (w->IsWidgetGloballyFocused(wid)) return true;
	if (w->window_class != WC_OSK || _focused_window != w->parent) return false;
	return w->parent->nested_focus != NULL && w->parent->nested_focus->type == WWT_EDITBOX;
}

HandleEditBoxResult QueryString::HandleEditBoxKey(Window *w, int wid, uint16 key, uint16 keycode, Window::EventState &state)
{
	if (!QueryString::HasEditBoxFocus(w, wid)) return HEBR_NOT_FOCUSED;

	state = Window::ES_HANDLED;

	switch (keycode) {
		case WKC_ESC: return HEBR_CANCEL;

		case WKC_RETURN: case WKC_NUM_ENTER: return HEBR_CONFIRM;

#ifdef WITH_COCOA
		case (WKC_META | 'V'):
#endif
		case (WKC_CTRL | 'V'):
			if (InsertTextBufferClipboard(&this->text)) w->SetWidgetDirty(wid);
			break;

#ifdef WITH_COCOA
		case (WKC_META | 'U'):
#endif
		case (WKC_CTRL | 'U'):
			DeleteTextBufferAll(&this->text);
			w->SetWidgetDirty(wid);
			break;

		case WKC_BACKSPACE: case WKC_DELETE:
			if (DeleteTextBufferChar(&this->text, keycode)) w->SetWidgetDirty(wid);
			break;

		case WKC_LEFT: case WKC_RIGHT: case WKC_END: case WKC_HOME:
			if (MoveTextBufferPos(&this->text, keycode)) w->SetWidgetDirty(wid);
			break;

		default:
			if (IsValidChar(key, this->afilter)) {
				if (InsertTextBufferChar(&this->text, key)) w->SetWidgetDirty(wid);
			} else {
				state = Window::ES_NOT_HANDLED;
			}
	}

	return HEBR_EDITING;
}

void QueryString::HandleEditBox(Window *w, int wid)
{
	if (HasEditBoxFocus(w, wid) && HandleCaret(&this->text)) {
		w->SetWidgetDirty(wid);
		/* When we're not the OSK, notify 'our' OSK to redraw the widget,
		 * so the caret changes appropriately. */
		if (w->window_class != WC_OSK) {
			Window *w_osk = FindWindowById(WC_OSK, 0);
			if (w_osk != NULL && w_osk->parent == w) w_osk->InvalidateData();
		}
	}
}

void QueryString::DrawEditBox(Window *w, int wid)
{
	const NWidgetBase *wi = w->GetWidget<NWidgetBase>(wid);

	assert((wi->type & WWT_MASK) == WWT_EDITBOX);
	int left   = wi->pos_x;
	int right  = wi->pos_x + wi->current_x - 1;
	int top    = wi->pos_y;
	int bottom = wi->pos_y + wi->current_y - 1;

	GfxFillRect(left + 1, top + 1, right - 1, bottom - 1, 215);

	/* Limit the drawing of the string inside the widget boundaries */
	DrawPixelInfo dpi;
	if (!FillDrawPixelInfo(&dpi, left + WD_FRAMERECT_LEFT, top + WD_FRAMERECT_TOP, right - left - WD_FRAMERECT_RIGHT, bottom - top - WD_FRAMERECT_BOTTOM)) return;

	DrawPixelInfo *old_dpi = _cur_dpi;
	_cur_dpi = &dpi;

	/* We will take the current widget length as maximum width, with a small
	 * space reserved at the end for the caret to show */
	const Textbuf *tb = &this->text;
	int delta = min(0, (right - left) - tb->width - 10);

	if (tb->caretxoffs + delta < 0) delta = -tb->caretxoffs;

	DrawString(delta, tb->width, 0, tb->buf, TC_YELLOW);
	if (HasEditBoxFocus(w, wid) && tb->caret) {
		int caret_width = GetStringBoundingBox("_").width;
		DrawString(tb->caretxoffs + delta, tb->caretxoffs + delta + caret_width, 0, "_", TC_WHITE);
	}

	_cur_dpi = old_dpi;
}

HandleEditBoxResult QueryStringBaseWindow::HandleEditBoxKey(int wid, uint16 key, uint16 keycode, EventState &state)
{
	return this->QueryString::HandleEditBoxKey(this, wid, key, keycode, state);
}

void QueryStringBaseWindow::HandleEditBox(int wid)
{
	this->QueryString::HandleEditBox(this, wid);
}

void QueryStringBaseWindow::DrawEditBox(int wid)
{
	this->QueryString::DrawEditBox(this, wid);
}

void QueryStringBaseWindow::OnOpenOSKWindow(int wid)
{
	ShowOnScreenKeyboard(this, wid, 0, 0);
}

/** Widget of the string query window. */
enum QueryStringWidgets {
	QUERY_STR_WIDGET_CAPTION,
	QUERY_STR_WIDGET_TEXT,
	QUERY_STR_WIDGET_DEFAULT,
	QUERY_STR_WIDGET_CANCEL,
	QUERY_STR_WIDGET_OK
};

/** Class for the string query window. */
struct QueryStringWindow : public QueryStringBaseWindow
{
	QueryStringFlags flags; ///< Flags controlling behaviour of the window.

	QueryStringWindow(StringID str, StringID caption, uint maxsize, uint maxwidth, const WindowDesc *desc, Window *parent, CharSetFilter afilter, QueryStringFlags flags) :
			QueryStringBaseWindow(maxsize)
	{
		GetString(this->edit_str_buf, str, &this->edit_str_buf[maxsize - 1]);
		this->edit_str_buf[maxsize - 1] = '\0';

		if ((flags & QSF_ACCEPT_UNCHANGED) == 0) this->orig = strdup(this->edit_str_buf);

		this->caption = caption;
		this->afilter = afilter;
		this->flags = flags;
		InitializeTextBuffer(&this->text, this->edit_str_buf, maxsize, maxwidth);

		this->InitNested(desc);

		this->parent = parent;

		this->SetFocusedWidget(QUERY_STR_WIDGET_TEXT);
		this->LowerWidget(QUERY_STR_WIDGET_TEXT);
	}

	virtual void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize)
	{
		if (widget == QUERY_STR_WIDGET_DEFAULT && (this->flags & QSF_ENABLE_DEFAULT) == 0) {
			this->GetWidget<NWidgetCore>(widget)->SetFill(0, 1);
			size->width = 0;
		}
	}

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

		this->DrawEditBox(QUERY_STR_WIDGET_TEXT);
	}

	virtual void SetStringParameters(int widget) const
	{
		if (widget == QUERY_STR_WIDGET_CAPTION) SetDParam(0, this->caption);
	}

	void OnOk()
	{
		if (this->orig == NULL || strcmp(this->text.buf, this->orig) != 0) {
			/* If the parent is NULL, the editbox is handled by general function
			 * HandleOnEditText */
			if (this->parent != NULL) {
				this->parent->OnQueryTextFinished(this->text.buf);
			} else {
				HandleOnEditText(this->text.buf);
			}
			this->handled = true;
		}
	}

	virtual void OnClick(Point pt, int widget)
	{
		switch (widget) {
			case QUERY_STR_WIDGET_DEFAULT:
				this->text.buf[0] = '\0';
				/* Fallthrough */
			case QUERY_STR_WIDGET_OK:
				this->OnOk();
				/* Fallthrough */
			case QUERY_STR_WIDGET_CANCEL:
				delete this;
				break;
		}
	}

	virtual void OnMouseLoop()
	{
		this->HandleEditBox(QUERY_STR_WIDGET_TEXT);
	}

	virtual EventState OnKeyPress(uint16 key, uint16 keycode)
	{
		EventState state = ES_NOT_HANDLED;
		switch (this->HandleEditBoxKey(QUERY_STR_WIDGET_TEXT, key, keycode, state)) {
			default: NOT_REACHED();
			case HEBR_EDITING: {
				Window *osk = FindWindowById(WC_OSK, 0);
				if (osk != NULL && osk->parent == this) osk->InvalidateData();
			} break;
			case HEBR_CONFIRM: this->OnOk();
			/* FALL THROUGH */
			case HEBR_CANCEL: delete this; break; // close window, abandon changes
			case HEBR_NOT_FOCUSED: break;
		}
		return state;
	}

	virtual void OnOpenOSKWindow(int wid)
	{
		ShowOnScreenKeyboard(this, wid, QUERY_STR_WIDGET_CANCEL, QUERY_STR_WIDGET_OK);
	}

	~QueryStringWindow()
	{
		if (!this->handled && this->parent != NULL) {
			Window *parent = this->parent;
			this->parent = NULL; // so parent doesn't try to delete us again
			parent->OnQueryTextFinished(NULL);
		}
	}
};

static const NWidgetPart _nested_query_string_widgets[] = {
	NWidget(NWID_HORIZONTAL),
		NWidget(WWT_CLOSEBOX, COLOUR_GREY),
		NWidget(WWT_CAPTION, COLOUR_GREY, QUERY_STR_WIDGET_CAPTION), SetDataTip(STR_WHITE_STRING, STR_NULL),
	EndContainer(),
	NWidget(WWT_PANEL, COLOUR_GREY),
		NWidget(WWT_EDITBOX, COLOUR_GREY, QUERY_STR_WIDGET_TEXT), SetMinimalSize(256, 12), SetFill(1, 1), SetPadding(2, 2, 2, 2),
	EndContainer(),
	NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
		NWidget(WWT_TEXTBTN, COLOUR_GREY, QUERY_STR_WIDGET_DEFAULT), SetMinimalSize(87, 12), SetFill(1, 1), SetDataTip(STR_BUTTON_DEFAULT, STR_NULL),
		NWidget(WWT_TEXTBTN, COLOUR_GREY, QUERY_STR_WIDGET_CANCEL), SetMinimalSize(86, 12), SetFill(1, 1), SetDataTip(STR_BUTTON_CANCEL, STR_NULL),
		NWidget(WWT_TEXTBTN, COLOUR_GREY, QUERY_STR_WIDGET_OK), SetMinimalSize(87, 12), SetFill(1, 1), SetDataTip(STR_BUTTON_OK, STR_NULL),
	EndContainer(),
};

static const WindowDesc _query_string_desc(
	WDP_AUTO, 0, 0,
	WC_QUERY_STRING, WC_NONE,
	0,
	_nested_query_string_widgets, lengthof(_nested_query_string_widgets)
);

/** Show a query popup window with a textbox in it.
 * @param str StringID for the text shown in the textbox
 * @param caption StringID of text shown in caption of querywindow
 * @param maxsize maximum size in bytes (including terminating '\0')
 * @param maxwidth maximum width in pixels allowed
 * @param parent pointer to a Window that will handle the events (ok/cancel) of this
 *        window. If NULL, results are handled by global function HandleOnEditText
 * @param afilter filters out unwanted character input
 * @param flags various flags, @see QueryStringFlags
 */
void ShowQueryString(StringID str, StringID caption, uint maxsize, uint maxwidth, Window *parent, CharSetFilter afilter, QueryStringFlags flags)
{
	DeleteWindowById(WC_QUERY_STRING, 0);
	new QueryStringWindow(str, caption, maxsize, maxwidth, &_query_string_desc, parent, afilter, flags);
}


enum QueryWidgets {
	QUERY_WIDGET_CAPTION,
	QUERY_WIDGET_TEXT,
	QUERY_WIDGET_NO,
	QUERY_WIDGET_YES
};

/**
 * Window used for asking the user a YES/NO question.
 */
struct QueryWindow : public Window {
	QueryCallbackProc *proc; ///< callback function executed on closing of popup. Window* points to parent, bool is true if 'yes' clicked, false otherwise
	uint64 params[10];       ///< local copy of _decode_parameters
	StringID message;        ///< message shown for query window
	StringID caption;        ///< title of window

	QueryWindow(const WindowDesc *desc, StringID caption, StringID message, Window *parent, QueryCallbackProc *callback) : Window()
	{
		/* Create a backup of the variadic arguments to strings because it will be
		 * overridden pretty often. We will copy these back for drawing */
		CopyOutDParam(this->params, 0, lengthof(this->params));
		this->caption = caption;
		this->message = message;
		this->proc    = callback;

		this->InitNested(desc);

		if (parent == NULL) parent = FindWindowById(WC_MAIN_WINDOW, 0);
		this->parent = parent;
		this->left = parent->left + (parent->width / 2) - (this->width / 2);
		this->top = parent->top + (parent->height / 2) - (this->height / 2);
	}

	~QueryWindow()
	{
		if (this->proc != NULL) this->proc(this->parent, false);
	}

	virtual void SetStringParameters(int widget) const
	{
		switch (widget) {
			case QUERY_WIDGET_CAPTION:
				CopyInDParam(1, this->params, lengthof(this->params));
				SetDParam(0, this->caption);
				break;

			case QUERY_WIDGET_TEXT:
				CopyInDParam(0, this->params, lengthof(this->params));
				break;
		}
	}

	virtual void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize)
	{
		if (widget != QUERY_WIDGET_TEXT) return;

		Dimension d = GetStringMultiLineBoundingBox(this->message, *size);
		d.width += padding.width;
		d.height += padding.height;
		*size = d;
	}

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

		DrawStringMultiLine(r.left, r.right, r.top, r.bottom, this->message, TC_FROMSTRING, SA_CENTER);
	}

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

	virtual void OnClick(Point pt, int widget)
	{
		switch (widget) {
			case QUERY_WIDGET_YES: {
				/* in the Generate New World window, clicking 'Yes' causes
				 * DeleteNonVitalWindows() to be called - we shouldn't be in a window then */
				QueryCallbackProc *proc = this->proc;
				Window *parent = this->parent;
				/* Prevent the destructor calling the callback function */
				this->proc = NULL;
				delete this;
				if (proc != NULL) {
					proc(parent, true);
					proc = NULL;
				}
			} break;
			case QUERY_WIDGET_NO:
				delete this;
				break;
		}
	}

	virtual EventState OnKeyPress(uint16 key, uint16 keycode)
	{
		/* ESC closes the window, Enter confirms the action */
		switch (keycode) {
			case WKC_RETURN:
			case WKC_NUM_ENTER:
				if (this->proc != NULL) {
					this->proc(this->parent, true);
					this->proc = NULL;
				}
				/* Fallthrough */
			case WKC_ESC:
				delete this;
				return ES_HANDLED;
		}
		return ES_NOT_HANDLED;
	}
};

static const NWidgetPart _nested_query_widgets[] = {
	NWidget(NWID_HORIZONTAL),
		NWidget(WWT_CLOSEBOX, COLOUR_RED),
		NWidget(WWT_CAPTION, COLOUR_RED, QUERY_WIDGET_CAPTION), SetDataTip(STR_JUST_STRING, STR_NULL),
	EndContainer(),
	NWidget(WWT_PANEL, COLOUR_RED), SetPIP(8, 15, 8),
		NWidget(WWT_TEXT, COLOUR_RED, QUERY_WIDGET_TEXT), SetMinimalSize(200, 12),
		NWidget(NWID_HORIZONTAL, NC_EQUALSIZE), SetPIP(20, 29, 20),
			NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, QUERY_WIDGET_NO), SetMinimalSize(71, 12), SetDataTip(STR_QUIT_NO, STR_NULL),
			NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, QUERY_WIDGET_YES), SetMinimalSize(71, 12), SetDataTip(STR_QUIT_YES, STR_NULL),
		EndContainer(),
	EndContainer(),
};

static const WindowDesc _query_desc(
	WDP_CENTER, 0, 0,
	WC_CONFIRM_POPUP_QUERY, WC_NONE,
	WDF_UNCLICK_BUTTONS | WDF_MODAL,
	_nested_query_widgets, lengthof(_nested_query_widgets)
);

/** Show a modal confirmation window with standard 'yes' and 'no' buttons
 * The window is aligned to the centre of its parent.
 * @param caption string shown as window caption
 * @param message string that will be shown for the window
 * @param parent pointer to parent window, if this pointer is NULL the parent becomes
 * the main window WC_MAIN_WINDOW
 * @param callback callback function pointer to set in the window descriptor
 */
void ShowQuery(StringID caption, StringID message, Window *parent, QueryCallbackProc *callback)
{
	new QueryWindow(&_query_desc, caption, message, parent, callback);
}


enum SaveLoadWindowWidgets {
	SLWW_WINDOWTITLE,
	SLWW_SORT_BYNAME,
	SLWW_SORT_BYDATE,
	SLWW_BACKGROUND,
	SLWW_FILE_BACKGROUND,
	SLWW_HOME_BUTTON,
	SLWW_DRIVES_DIRECTORIES_LIST,
	SLWW_SCROLLBAR,
	SLWW_CONTENT_DOWNLOAD,     ///< only available for play scenario/heightmap (content download)
	SLWW_SAVE_OSK_TITLE,       ///< only available for save operations
	SLWW_DELETE_SELECTION,     ///< same in here
	SLWW_SAVE_GAME,            ///< not to mention in here too
	SLWW_CONTENT_DOWNLOAD_SEL, ///< Selection 'stack' to 'hide' the content download
};

static const NWidgetPart _nested_load_dialog_widgets[] = {
	NWidget(NWID_HORIZONTAL),
		NWidget(WWT_CLOSEBOX, COLOUR_GREY),
		NWidget(WWT_CAPTION, COLOUR_GREY, SLWW_WINDOWTITLE),
	EndContainer(),
	NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
		NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, SLWW_SORT_BYNAME), SetDataTip(STR_SORT_BY_CAPTION_NAME, STR_TOOLTIP_SORT_ORDER), SetFill(1, 0), SetResize(1, 0),
		NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, SLWW_SORT_BYDATE), SetDataTip(STR_SORT_BY_CAPTION_DATE, STR_TOOLTIP_SORT_ORDER), SetFill(1, 0), SetResize(1, 0),
	EndContainer(),
	NWidget(WWT_PANEL, COLOUR_GREY, SLWW_BACKGROUND), SetFill(1, 0), SetResize(1, 0), EndContainer(),
	NWidget(WWT_PANEL, COLOUR_GREY, SLWW_FILE_BACKGROUND),
		NWidget(NWID_HORIZONTAL),
			NWidget(NWID_VERTICAL),
				NWidget(WWT_INSET, COLOUR_GREY, SLWW_DRIVES_DIRECTORIES_LIST), SetFill(1, 1), SetPadding(2, 1, 2, 2),
										SetDataTip(0x0, STR_SAVELOAD_LIST_TOOLTIP), SetResize(1, 10), EndContainer(),
				NWidget(NWID_SELECTION, INVALID_COLOUR, SLWW_CONTENT_DOWNLOAD_SEL),
					NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, SLWW_CONTENT_DOWNLOAD), SetResize(1, 0),
										SetDataTip(STR_INTRO_ONLINE_CONTENT, STR_INTRO_TOOLTIP_ONLINE_CONTENT),
				EndContainer(),
			EndContainer(),
			NWidget(NWID_VERTICAL),
				NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, SLWW_HOME_BUTTON), SetMinimalSize(12, 12), SetDataTip(SPR_HOUSE_ICON, STR_SAVELOAD_HOME_BUTTON),
				NWidget(WWT_SCROLLBAR, COLOUR_GREY, SLWW_SCROLLBAR),
				NWidget(WWT_RESIZEBOX, COLOUR_GREY),
			EndContainer(),
		EndContainer(),
	EndContainer(),
};

static const NWidgetPart _nested_save_dialog_widgets[] = {
	NWidget(NWID_HORIZONTAL),
		NWidget(WWT_CLOSEBOX, COLOUR_GREY),
		NWidget(WWT_CAPTION, COLOUR_GREY, SLWW_WINDOWTITLE),
	EndContainer(),
	NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
		NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, SLWW_SORT_BYNAME), SetDataTip(STR_SORT_BY_CAPTION_NAME, STR_TOOLTIP_SORT_ORDER), SetFill(1, 0), SetResize(1, 0),
		NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, SLWW_SORT_BYDATE), SetDataTip(STR_SORT_BY_CAPTION_DATE, STR_TOOLTIP_SORT_ORDER), SetFill(1, 0), SetResize(1, 0),
	EndContainer(),
	NWidget(WWT_PANEL, COLOUR_GREY, SLWW_BACKGROUND), SetFill(1, 0), SetResize(1, 0), EndContainer(),
	NWidget(WWT_PANEL, COLOUR_GREY, SLWW_FILE_BACKGROUND),
		NWidget(NWID_HORIZONTAL),
			NWidget(WWT_INSET, COLOUR_GREY, SLWW_DRIVES_DIRECTORIES_LIST), SetPadding(2, 1, 0, 2),
										SetDataTip(0x0, STR_SAVELOAD_LIST_TOOLTIP), SetResize(1, 10), EndContainer(),
			NWidget(NWID_VERTICAL),
				NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, SLWW_HOME_BUTTON), SetMinimalSize(12, 12), SetDataTip(SPR_HOUSE_ICON, STR_SAVELOAD_HOME_BUTTON),
				NWidget(WWT_SCROLLBAR, COLOUR_GREY, SLWW_SCROLLBAR),
			EndContainer(),
		EndContainer(),
		NWidget(WWT_EDITBOX, COLOUR_GREY, SLWW_SAVE_OSK_TITLE), SetPadding(3, 2, 2, 2), SetFill(1, 0), SetResize(1, 0),
										SetDataTip(STR_SAVELOAD_OSKTITLE, STR_SAVELOAD_EDITBOX_TOOLTIP),
	EndContainer(),
	NWidget(NWID_HORIZONTAL),
		NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, SLWW_DELETE_SELECTION), SetDataTip(STR_SAVELOAD_DELETE_BUTTON, STR_SAVELOAD_DELETE_TOOLTIP), SetFill(1, 0), SetResize(1, 0),
		NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, SLWW_SAVE_GAME),        SetDataTip(STR_SAVELOAD_SAVE_BUTTON, STR_SAVELOAD_SAVE_TOOLTIP),     SetFill(1, 0), SetResize(1, 0),
		NWidget(WWT_RESIZEBOX, COLOUR_GREY),
	EndContainer(),
};

/* Colours for fios types */
const TextColour _fios_colours[] = {
	TC_LIGHT_BLUE, TC_DARK_GREEN,  TC_DARK_GREEN, TC_ORANGE, TC_LIGHT_BROWN,
	TC_ORANGE,     TC_LIGHT_BROWN, TC_ORANGE,     TC_ORANGE, TC_YELLOW
};

void BuildFileList()
{
	_fios_path_changed = true;
	FiosFreeSavegameList();

	switch (_saveload_mode) {
		case SLD_NEW_GAME:
		case SLD_LOAD_SCENARIO:
		case SLD_SAVE_SCENARIO:
			FiosGetScenarioList(_saveload_mode); break;
		case SLD_LOAD_HEIGHTMAP:
			FiosGetHeightmapList(_saveload_mode); break;

		default: FiosGetSavegameList(_saveload_mode); break;
	}
}

static void MakeSortedSaveGameList()
{
	uint sort_start = 0;
	uint sort_end = 0;

	/* Directories are always above the files (FIOS_TYPE_DIR)
	 * Drives (A:\ (windows only) are always under the files (FIOS_TYPE_DRIVE)
	 * Only sort savegames/scenarios, not directories
	 */
	for (const FiosItem *item = _fios_items.Begin(); item != _fios_items.End(); item++) {
		switch (item->type) {
			case FIOS_TYPE_DIR:    sort_start++; break;
			case FIOS_TYPE_PARENT: sort_start++; break;
			case FIOS_TYPE_DRIVE:  sort_end++;   break;
			default: break;
		}
	}

	uint s_amount = _fios_items.Length() - sort_start - sort_end;
	QSortT(_fios_items.Get(sort_start), s_amount, CompareFiosItems);
}

extern void StartupEngines();

struct SaveLoadWindow : public QueryStringBaseWindow {
private:
	FiosItem o_dir;
public:

	void GenerateFileName()
	{
		GenerateDefaultSaveName(this->edit_str_buf, &this->edit_str_buf[this->edit_str_size - 1]);
	}

	SaveLoadWindow(const WindowDesc *desc, SaveLoadDialogMode mode) : QueryStringBaseWindow(64)
	{
		static const StringID saveload_captions[] = {
			STR_SAVELOAD_LOAD_CAPTION,
			STR_SAVELOAD_LOAD_SCENARIO,
			STR_SAVELOAD_SAVE_CAPTION,
			STR_SAVELOAD_SAVE_SCENARIO,
			STR_SAVELOAD_LOAD_HEIGHTMAP,
		};
		assert((uint)mode < lengthof(saveload_captions));

		/* Use an array to define what will be the current file type being handled
		 * by current file mode */
		switch (mode) {
			case SLD_SAVE_GAME:     this->GenerateFileName(); break;
			case SLD_SAVE_SCENARIO: strecpy(this->edit_str_buf, "UNNAMED", &this->edit_str_buf[edit_str_size - 1]); break;
			default:                break;
		}

		this->afilter = CS_ALPHANUMERAL;
		InitializeTextBuffer(&this->text, this->edit_str_buf, this->edit_str_size, 240);

		this->CreateNestedTree(desc);
		if (mode == SLD_LOAD_GAME) this->GetWidget<NWidgetStacked>(SLWW_CONTENT_DOWNLOAD_SEL)->SetDisplayedPlane(SZSP_HORIZONTAL);
		this->GetWidget<NWidgetCore>(SLWW_WINDOWTITLE)->widget_data = saveload_captions[mode];

		this->FinishInitNested(desc, 0);

		this->LowerWidget(SLWW_DRIVES_DIRECTORIES_LIST);

		/* pause is only used in single-player, non-editor mode, non-menu mode. It
		 * will be unpaused in the WE_DESTROY event handler. */
		if (_game_mode != GM_MENU && !_networking && _game_mode != GM_EDITOR) {
			DoCommandP(0, PM_PAUSED_SAVELOAD, 1, CMD_PAUSE);
		}
		SetObjectToPlace(SPR_CURSOR_ZZZ, PAL_NONE, HT_NONE, WC_MAIN_WINDOW, 0);

		BuildFileList();

		ResetObjectToPlace();

		o_dir.type = FIOS_TYPE_DIRECT;
		switch (_saveload_mode) {
			case SLD_SAVE_GAME:
			case SLD_LOAD_GAME:
				FioGetDirectory(o_dir.name, lengthof(o_dir.name), SAVE_DIR);
				break;

			case SLD_SAVE_SCENARIO:
			case SLD_LOAD_SCENARIO:
				FioGetDirectory(o_dir.name, lengthof(o_dir.name), SCENARIO_DIR);
				break;

			case SLD_LOAD_HEIGHTMAP:
				FioGetDirectory(o_dir.name, lengthof(o_dir.name), HEIGHTMAP_DIR);
				break;

			default:
				strecpy(o_dir.name, _personal_dir, lastof(o_dir.name));
		}

		/* Focus the edit box by default in the save windows */
		if (_saveload_mode == SLD_SAVE_GAME || _saveload_mode == SLD_SAVE_SCENARIO) {
			this->SetFocusedWidget(SLWW_SAVE_OSK_TITLE);
		}
	}

	virtual ~SaveLoadWindow()
	{
		/* pause is only used in single-player, non-editor mode, non menu mode */
		if (!_networking && _game_mode != GM_EDITOR && _game_mode != GM_MENU) {
			DoCommandP(0, PM_PAUSED_SAVELOAD, 0, CMD_PAUSE);
		}
		FiosFreeSavegameList();
	}

	virtual void DrawWidget(const Rect &r, int widget) const
	{
		switch (widget) {
			case SLWW_SORT_BYNAME:
			case SLWW_SORT_BYDATE:
				if (((_savegame_sort_order & SORT_BY_NAME) != 0) == (widget == SLWW_SORT_BYNAME)) {
					this->DrawSortButtonState(widget, _savegame_sort_order & SORT_DESCENDING ? SBS_DOWN : SBS_UP);
				}
				break;

			case SLWW_BACKGROUND: {
				static const char *path = NULL;
				static StringID str = STR_ERROR_UNABLE_TO_READ_DRIVE;
				static uint64 tot = 0;

				if (_fios_path_changed) {
					str = FiosGetDescText(&path, &tot);
					_fios_path_changed = false;
				}

				if (str != STR_ERROR_UNABLE_TO_READ_DRIVE) SetDParam(0, tot);
				DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, r.top + FONT_HEIGHT_NORMAL + WD_FRAMERECT_TOP, str);
				DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, r.top + WD_FRAMERECT_TOP, path, TC_BLACK);
			} break;

			case SLWW_DRIVES_DIRECTORIES_LIST: {
				GfxFillRect(r.left + 1, r.top + 1, r.right, r.bottom, 0xD7);

				uint y = r.top + WD_FRAMERECT_TOP;
				for (uint pos = this->vscroll.GetPosition(); pos < _fios_items.Length(); pos++) {
					const FiosItem *item = _fios_items.Get(pos);

					DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, y, item->title, _fios_colours[item->type]);
					y += this->resize.step_height;
					if (y >= this->vscroll.GetCapacity() * this->resize.step_height + r.top + WD_FRAMERECT_TOP) break;
				}
			} break;
		}
	}

	virtual void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize)
	{
		switch (widget) {
			case SLWW_BACKGROUND:
				size->height = 2 * FONT_HEIGHT_NORMAL + WD_FRAMERECT_TOP + WD_FRAMERECT_BOTTOM;
				break;

			case SLWW_DRIVES_DIRECTORIES_LIST:
				resize->height = FONT_HEIGHT_NORMAL;
				size->height = resize->height * 10 + WD_FRAMERECT_TOP + WD_FRAMERECT_BOTTOM;
				break;
		}
	}

	virtual void OnPaint()
	{
		if (_savegame_sort_dirty) {
			_savegame_sort_dirty = false;
			MakeSortedSaveGameList();
		}

		this->vscroll.SetCount(_fios_items.Length());
		this->DrawWidgets();

		if (_saveload_mode == SLD_SAVE_GAME || _saveload_mode == SLD_SAVE_SCENARIO) {
			this->DrawEditBox(SLWW_SAVE_OSK_TITLE);
		}
	}

	virtual void OnClick(Point pt, int widget)
	{
		switch (widget) {
			case SLWW_SORT_BYNAME: // Sort save names by name
				_savegame_sort_order = (_savegame_sort_order == SORT_BY_NAME) ?
					SORT_BY_NAME | SORT_DESCENDING : SORT_BY_NAME;
				_savegame_sort_dirty = true;
				this->SetDirty();
				break;

			case SLWW_SORT_BYDATE: // Sort save names by date
				_savegame_sort_order = (_savegame_sort_order == SORT_BY_DATE) ?
					SORT_BY_DATE | SORT_DESCENDING : SORT_BY_DATE;
				_savegame_sort_dirty = true;
				this->SetDirty();
				break;

			case SLWW_HOME_BUTTON: // OpenTTD 'button', jumps to OpenTTD directory
				FiosBrowseTo(&o_dir);
				this->SetDirty();
				BuildFileList();
				break;

			case SLWW_DRIVES_DIRECTORIES_LIST: { // Click the listbox
				int y = (pt.y - this->GetWidget<NWidgetBase>(SLWW_DRIVES_DIRECTORIES_LIST)->pos_y - WD_FRAMERECT_TOP) / this->resize.step_height;

				if (y < 0 || (y += this->vscroll.GetPosition()) >= this->vscroll.GetCount()) return;

				const FiosItem *file = _fios_items.Get(y);

				const char *name = FiosBrowseTo(file);
				if (name != NULL) {
					if (_saveload_mode == SLD_LOAD_GAME || _saveload_mode == SLD_LOAD_SCENARIO) {
						_switch_mode = (_game_mode == GM_EDITOR) ? SM_LOAD_SCENARIO : SM_LOAD;

						SetFiosType(file->type);
						strecpy(_file_to_saveload.name, name, lastof(_file_to_saveload.name));
						strecpy(_file_to_saveload.title, file->title, lastof(_file_to_saveload.title));

						delete this;
					} else if (_saveload_mode == SLD_LOAD_HEIGHTMAP) {
						SetFiosType(file->type);
						strecpy(_file_to_saveload.name, name, lastof(_file_to_saveload.name));
						strecpy(_file_to_saveload.title, file->title, lastof(_file_to_saveload.title));

						delete this;
						ShowHeightmapLoad();
					} else {
						/* SLD_SAVE_GAME, SLD_SAVE_SCENARIO copy clicked name to editbox */
						ttd_strlcpy(this->text.buf, file->title, this->text.maxsize);
						UpdateTextBufferSize(&this->text);
						this->SetWidgetDirty(SLWW_SAVE_OSK_TITLE);
					}
				} else {
					/* Changed directory, need repaint. */
					this->SetDirty();
					BuildFileList();
				}
				break;
			}

			case SLWW_CONTENT_DOWNLOAD:
				if (!_network_available) {
					ShowErrorMessage(STR_NETWORK_ERROR_NOTAVAILABLE, INVALID_STRING_ID, 0, 0);
				} else {
#if defined(ENABLE_NETWORK)
					switch (_saveload_mode) {
						default: NOT_REACHED();
						case SLD_LOAD_SCENARIO:  ShowNetworkContentListWindow(NULL, CONTENT_TYPE_SCENARIO);  break;
						case SLD_LOAD_HEIGHTMAP: ShowNetworkContentListWindow(NULL, CONTENT_TYPE_HEIGHTMAP); break;
					}
#endif
				}
				break;

			case SLWW_DELETE_SELECTION: case SLWW_SAVE_GAME: // Delete, Save game
				break;
		}
	}

	virtual void OnMouseLoop()
	{
		if (_saveload_mode == SLD_SAVE_GAME || _saveload_mode == SLD_SAVE_SCENARIO) {
			this->HandleEditBox(SLWW_SAVE_OSK_TITLE);
		}
	}

	virtual EventState OnKeyPress(uint16 key, uint16 keycode)
	{
		if (keycode == WKC_ESC) {
			delete this;
			return ES_HANDLED;
		}

		EventState state = ES_NOT_HANDLED;
		if ((_saveload_mode == SLD_SAVE_GAME || _saveload_mode == SLD_SAVE_SCENARIO) &&
				this->HandleEditBoxKey(SLWW_SAVE_OSK_TITLE, key, keycode, state) == HEBR_CONFIRM) {
			this->HandleButtonClick(SLWW_SAVE_GAME);
		}

		return state;
	}

	virtual void OnTimeout()
	{
		/* This test protects against using widgets 11 and 12 which are only available
		 * in those two saveload mode */
		if (!(_saveload_mode == SLD_SAVE_GAME || _saveload_mode == SLD_SAVE_SCENARIO)) return;

		if (this->IsWidgetLowered(SLWW_DELETE_SELECTION)) { // Delete button clicked
			if (!FiosDelete(this->text.buf)) {
				ShowErrorMessage(STR_ERROR_UNABLE_TO_DELETE_FILE, INVALID_STRING_ID, 0, 0);
			} else {
				BuildFileList();
				/* Reset file name to current date on successful delete */
				if (_saveload_mode == SLD_SAVE_GAME) GenerateFileName();
			}

			UpdateTextBufferSize(&this->text);
			this->SetDirty();
		} else if (this->IsWidgetLowered(SLWW_SAVE_GAME)) { // Save button clicked
			_switch_mode = SM_SAVE;
			FiosMakeSavegameName(_file_to_saveload.name, this->text.buf, sizeof(_file_to_saveload.name));

			/* In the editor set up the vehicle engines correctly (date might have changed) */
			if (_game_mode == GM_EDITOR) StartupEngines();
		}
	}

	virtual void OnResize()
	{
		this->vscroll.SetCapacityFromWidget(this, SLWW_DRIVES_DIRECTORIES_LIST);
	}

	virtual void OnInvalidateData(int data)
	{
		BuildFileList();
	}
};

static const WindowDesc _load_dialog_desc(
	WDP_CENTER, 257, 294,
	WC_SAVELOAD, WC_NONE,
	WDF_UNCLICK_BUTTONS,
	_nested_load_dialog_widgets, lengthof(_nested_load_dialog_widgets)
);

static const WindowDesc _save_dialog_desc(
	WDP_CENTER, 257, 320,
	WC_SAVELOAD, WC_NONE,
	WDF_UNCLICK_BUTTONS,
	_nested_save_dialog_widgets, lengthof(_nested_save_dialog_widgets)
);

/** These values are used to convert the file/operations mode into a corresponding file type.
 * So each entry, as expressed by the related comment, is based on the enum   */
static const FileType _file_modetotype[] = {
	FT_SAVEGAME,  ///< used for SLD_LOAD_GAME
	FT_SCENARIO,  ///< used for SLD_LOAD_SCENARIO
	FT_SAVEGAME,  ///< used for SLD_SAVE_GAME
	FT_SCENARIO,  ///< used for SLD_SAVE_SCENARIO
	FT_HEIGHTMAP, ///< used for SLD_LOAD_HEIGHTMAP
	FT_SAVEGAME,  ///< SLD_NEW_GAME
};

void ShowSaveLoadDialog(SaveLoadDialogMode mode)
{
	DeleteWindowById(WC_SAVELOAD, 0);

	const WindowDesc *sld;
	switch (mode) {
		case SLD_SAVE_GAME:
		case SLD_SAVE_SCENARIO:
			sld = &_save_dialog_desc; break;
		default:
			sld = &_load_dialog_desc; break;
	}

	_saveload_mode = mode;
	_file_to_saveload.filetype = _file_modetotype[mode];

	new SaveLoadWindow(sld, mode);
}

void RedrawAutosave()
{
	SetWindowDirty(WC_STATUS_BAR, 0);
}

void SetFiosType(const byte fiostype)
{
	switch (fiostype) {
		case FIOS_TYPE_FILE:
		case FIOS_TYPE_SCENARIO:
			_file_to_saveload.mode = SL_LOAD;
			break;

		case FIOS_TYPE_OLDFILE:
		case FIOS_TYPE_OLD_SCENARIO:
			_file_to_saveload.mode = SL_OLD_LOAD;
			break;

#ifdef WITH_PNG
		case FIOS_TYPE_PNG:
			_file_to_saveload.mode = SL_PNG;
			break;
#endif /* WITH_PNG */

		case FIOS_TYPE_BMP:
			_file_to_saveload.mode = SL_BMP;
			break;

		default:
			_file_to_saveload.mode = SL_INVALID;
			break;
	}
}
