/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program 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, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "m4/riddle/gui/game_menu.h"
#include "m4/riddle/vars.h"
#include "graphics/thumbnail.h"
#include "m4/adv_r/other.h"
#include "m4/adv_r/adv_player.h"
#include "m4/core/imath.h"
#include "m4/gui/gui_event.h"
#include "m4/gui/hotkeys.h"
#include "m4/gui/gui_sys.h"
#include "m4/gui/gui_vmng.h"
#include "m4/mem/mem.h"
#include "m4/platform/keys.h"
#include "m4/m4.h"
#include "common/config-manager.h"

#include "m4/burger/gui/game_menu.h"

namespace M4 {
namespace Riddle {
namespace GUI {

/*-------------------- GAME MENU --------------------*/

#define GAME_MENU_X		212
#define GAME_MENU_Y		160

#define GM_TAG_QUIT     1
#define GM_QUIT_X		13
#define GM_QUIT_Y		31
#define GM_QUIT_W		26
#define GM_QUIT_H		26

#define GM_TAG_MAIN     2
#define GM_MAIN_X		108
#define GM_MAIN_Y		31
#define GM_MAIN_W		26
#define GM_MAIN_H		26

#define GM_TAG_OPTIONS	3
#define GM_OPTIONS_X	162
#define GM_OPTIONS_Y	31
#define GM_OPTIONS_W	26
#define GM_OPTIONS_H	26

#define GM_TAG_RESUME	4
#define GM_RESUME_X		54
#define GM_RESUME_Y		94
#define GM_RESUME_W		26
#define GM_RESUME_H		26

#define GM_TAG_SAVE		5
#define GM_SAVE_X		108
#define GM_SAVE_Y		94
#define GM_SAVE_W		26
#define GM_SAVE_H		26

#define GM_TAG_LOAD		6
#define GM_LOAD_X		162
#define GM_LOAD_Y		94
#define GM_LOAD_W		26
#define GM_LOAD_H		26

void GameMenu::show(RGB8 *myPalette) {
	if (!_G(menuSystemInitialized)) {
		guiMenu::initialize(myPalette);
	}

	// Load in the game menu sprites
	if (!guiMenu::loadSprites("gamemenu", GM_TOTAL_SPRITES))
		error("Error loading gamemenu");

	_GM(gameMenu) = guiMenu::create(_GM(menuSprites)[GM_DIALOG_BOX],
		GAME_MENU_X, GAME_MENU_Y, MENU_DEPTH | SF_GET_ALL | SF_BLOCK_ALL | SF_IMMOVABLE);
	assert(_GM(gameMenu));

	menuItemButton::add(_GM(gameMenu), GM_TAG_QUIT,
		GM_QUIT_X, GM_QUIT_Y, GM_QUIT_W, GM_QUIT_H, cbQuitGame);
	menuItemButton::add(_GM(gameMenu), GM_TAG_MAIN,
		GM_MAIN_X, GM_MAIN_Y, GM_MAIN_W, GM_MAIN_H, cbMainMenu);
	menuItemButton::add(_GM(gameMenu), GM_TAG_OPTIONS, GM_OPTIONS_X, GM_OPTIONS_Y, GM_OPTIONS_W, GM_OPTIONS_H, cbOptions);
	menuItemButton::add(_GM(gameMenu), GM_TAG_RESUME, GM_RESUME_X, GM_RESUME_Y, GM_RESUME_W, GM_RESUME_H, cbResume);

	if (!_GM(gameMenuFromMain)) {
		menuItemButton::add(_GM(gameMenu), GM_TAG_SAVE, GM_SAVE_X, GM_SAVE_Y, GM_SAVE_W, GM_SAVE_H, cbSave);
	} else {
		menuItemButton::add(_GM(gameMenu), GM_TAG_SAVE, GM_SAVE_X, GM_SAVE_Y, GM_SAVE_W, GM_SAVE_H, cbSave, menuItemButton::BTN_TYPE_GM_GENERIC, true);
	}

	// See if there are any games to load
	if (g_engine->savesExist()) {
		menuItemButton::add(_GM(gameMenu), GM_TAG_LOAD, GM_LOAD_X, GM_LOAD_Y, GM_LOAD_W, GM_LOAD_H, cbLoad);
	} else {
		menuItemButton::add(_GM(gameMenu), GM_TAG_LOAD, GM_LOAD_X, GM_LOAD_Y, GM_LOAD_W, GM_LOAD_H, cbLoad, menuItemButton::BTN_TYPE_GM_GENERIC, true);
	}

	// Configure the game so pressing <esc> will cause the menu to disappear and the game to resume
	guiMenu::configure(_GM(gameMenu), cbResume, cbResume);

	vmng_screen_show((void *)_GM(gameMenu));
	LockMouseSprite(0);
}

void GameMenu::destroyGameMenu() {
	if (!_GM(gameMenu))
		return;

	// Remove the screen from the gui
	vmng_screen_dispose(_GM(gameMenu));

	// Destroy the menu resources
	guiMenu::destroy(_GM(gameMenu));

	// Unload the menu sprites
	guiMenu::unloadSprites();
}

void GameMenu::cbQuitGame(void *, void *) {
	// Destroy the game menu
	destroyGameMenu();

	// Shutdown the menu system
	guiMenu::shutdown(false);

	// Set the global that will cause the entire game to exit to dos
	_G(kernel).going = false;
}

void GameMenu::cbMainMenu(void *, void *) {
	// Destroy the game menu
	destroyGameMenu();

	if (!_GM(gameMenuFromMain)) {
		// Save the game so we can resume from here if possible
		if (_GM(interfaceWasVisible) && player_commands_allowed()) {
			other_save_game_for_resurrection();
		}

		// Make sure the interface does not reappear
		_GM(interfaceWasVisible) = false;

		// Shutdown the menu system
		guiMenu::shutdown(false);
	} else {
		guiMenu::shutdown(true);
	}

	// Go to the main menu
	_G(game).setRoom(494);
}

void GameMenu::cbResume(void *, void *) {
	// Destroy the game menu
	destroyGameMenu();

	// Shutdown the menu system
	guiMenu::shutdown(true);
}

void GameMenu::cbOptions(void *, void *) {
	// Destroy the game menu
	destroyGameMenu();

	_GM(buttonClosesDialog) = true;

	// Create the options menu
	OptionsMenu::show();
}

void GameMenu::cbSave(void *, void *) {
	destroyGameMenu();
	guiMenu::shutdown(true);
	_GM(buttonClosesDialog) = true;

	// Create the save game menu
	g_engine->showSaveScreen();
}

void GameMenu::cbLoad(void *, void *) {
	destroyGameMenu();
	guiMenu::shutdown(true);
	_GM(buttonClosesDialog) = true;

	// Create the load game menu
	g_engine->showLoadScreen(M4Engine::kLoadFromGameDialog);
}

/*-------------------- OPTIONS MENU --------------------*/

#define OPTIONS_MENU_X 212
#define OPTIONS_MENU_Y 160

#define OM_TAG_GAMEMENU		1
#define OM_GAMEMENU_X		14
#define OM_GAMEMENU_Y		94
#define OM_GAMEMENU_W		26
#define OM_GAMEMENU_H		26

#define OM_TAG_DIGI			2
#define OM_DIGI_X			70
#define OM_DIGI_Y			29
#define OM_DIGI_W			108
#define OM_DIGI_H			14

#define OM_TAG_MIDI			3
#define OM_MIDI_X			70
#define OM_MIDI_Y			72
#define OM_MIDI_W			108
#define OM_MIDI_H			14

#define OM_TAG_SCROLLING	4
#define OM_SCROLLING_X		131
#define OM_SCROLLING_Y		113
#define OM_SCROLLING_W		39
#define OM_SCROLLING_H		39

void OptionsMenu::show() {
	// Load in the options menu sprites
	if (!guiMenu::loadSprites("opmenu", OM_TOTAL_SPRITES))
		error("Error loading opmenu");

	_GM(opMenu) = guiMenu::create(_GM(menuSprites)[OM_DIALOG_BOX],
		OPTIONS_MENU_X, OPTIONS_MENU_Y, MENU_DEPTH | SF_GET_ALL | SF_BLOCK_ALL | SF_IMMOVABLE);
	assert(_GM(opMenu));

	const int digiPercent = ConfMan.getInt("sfx_volume") * 100 / 256;
	const int midiPercent = ConfMan.getInt("music_volume") * 100 / 256;

	menuItemButton::add(_GM(opMenu), OM_TAG_GAMEMENU,
		OM_GAMEMENU_X, OM_GAMEMENU_Y, OM_GAMEMENU_W, OM_GAMEMENU_H,
		cbGameMenu, menuItemButton::BTN_TYPE_GM_GENERIC);
	menuItemHSlider::add(_GM(opMenu), OM_TAG_DIGI,
		OM_DIGI_X, OM_DIGI_Y, OM_DIGI_W, OM_DIGI_H,
		digiPercent, (CALLBACK)cbSetDigi, true);
	menuItemHSlider::add(_GM(opMenu), OM_TAG_MIDI,
		OM_MIDI_X, OM_MIDI_Y, OM_MIDI_W, OM_MIDI_H,
		midiPercent, (CALLBACK)cbSetMidi, true);
	menuItemButton::add(_GM(opMenu), OM_TAG_SCROLLING,
		OM_SCROLLING_X, OM_SCROLLING_Y, OM_SCROLLING_W, OM_SCROLLING_H, (CALLBACK)cbScrolling,
		_G(kernel).cameraPans() ? menuItemButton::BTN_TYPE_OM_SCROLLING_ON :
			menuItemButton::BTN_TYPE_OM_SCROLLING_OFF);

	guiMenu::configure(_GM(opMenu), cbGameMenu, cbGameMenu);
	vmng_screen_show((void *)_GM(opMenu));
	LockMouseSprite(0);
}

void OptionsMenu::destroyOptionsMenu() {
	// Remove the screen from the gui
	vmng_screen_dispose(_GM(opMenu));

	// Destroy the menu resources
	guiMenu::destroy(_GM(opMenu));

	// Unload the menu sprites
	guiMenu::unloadSprites();
}

void OptionsMenu::cbGameMenu(void *, void *) {
	destroyOptionsMenu();

	GameMenu::show(nullptr);
}

void OptionsMenu::cbScrolling(M4::GUI::menuItemButton *myItem, M4::GUI::guiMenu *) {
	_G(kernel).camera_pan_instant = myItem->buttonType ==
		menuItemButton::BTN_TYPE_OM_SCROLLING_ON;
}

void OptionsMenu::cbSetDigi(M4::GUI::menuItemHSlider *myItem, M4::GUI::guiMenu *) {
	ConfMan.setInt("sfx_volume", myItem->percent * 256 / 100);
	g_engine->syncSoundSettings();
}

void OptionsMenu::cbSetMidi(M4::GUI::menuItemHSlider *myItem, M4::GUI::guiMenu *) {
	ConfMan.setInt("music_volume", myItem->percent * 256 / 100);
	g_engine->syncSoundSettings();
}

/*------------------- SAVE/LOAD METHODS ------------------*/

#define SAVE_LOAD_MENU_X 42
#define SAVE_LOAD_MENU_Y 155

#define SL_TITLE_X		111
#define SL_TITLE_Y		2
#define SL_TITLE_W		110
#define SL_TITLE_H		17

#define SL_THUMBNAIL_X		333
#define SL_THUMBNAIL_Y		5

#define SL_SAVELOAD_X	10
#define SL_SAVELOAD_Y	74
#define SL_SAVELOAD_W	26
#define SL_SAVELOAD_H	26

#define SL_SAVELOAD_LABEL_X		8
#define SL_SAVELOAD_LABEL_Y		103
#define SL_SAVELOAD_LABEL_W		30
#define SL_SAVELOAD_LABEL_H		14

#define SL_CANCEL_X		10
#define SL_CANCEL_Y		122
#define SL_CANCEL_W		26
#define SL_CANCEL_H		26

#define SL_SLIDER_X		305
#define SL_SLIDER_Y		21
#define SL_SLIDER_W		20
#define SL_SLIDER_H		140

#define SL_SCROLL_FIELD_X	46
#define SL_SCROLL_FIELD_Y	21
#define SL_SCROLL_LINE_W	258
#define SL_SCROLL_LINE_H	14
#define SL_SCROLL_FIELD_W	257
#define SL_SCROLL_FIELD_H	139

void SaveLoadMenu::show(RGB8 *myPalette, bool saveMenu) {
	if (!_G(menuSystemInitialized))
		guiMenu::initialize(myPalette);

	// Load in the game menu sprites
	if (!guiMenu::loadSprites("slmenu", GUI::SaveLoadMenuBase::SL_TOTAL_SPRITES)) {
		return;
	}

	// Initialize some global vars
	_GM(firstSlotIndex) = 0;
	_GM(slotSelected) = -1;
	_GM(saveLoadThumbNail) = nullptr;
	_GM(thumbIndex) = 100;
	_GM(currMenuIsSave) = saveMenu;

	_GM(slMenu) = guiMenu::create(_GM(menuSprites)[GUI::SaveLoadMenuBase::SL_DIALOG_BOX],
		SAVE_LOAD_MENU_X, SAVE_LOAD_MENU_Y,
		MENU_DEPTH | SF_GET_ALL | SF_BLOCK_ALL | SF_IMMOVABLE);
	if (!_GM(slMenu)) {
		return;
	}

	if (_GM(currMenuIsSave)) {
		menuItemMsg::msgAdd(_GM(slMenu), SL_TAG_SAVE_TITLE_LABEL,
			SL_TITLE_X, SL_TITLE_Y, SL_TITLE_W, SL_TITLE_H);

		menuItemButton::add(_GM(slMenu), SL_TAG_SAVE,
			SL_SAVELOAD_X, SL_SAVELOAD_Y,
			SL_SAVELOAD_W, SL_SAVELOAD_H, (CALLBACK)cbSave,
			menuItemButton::BTN_TYPE_GM_GENERIC, true);
		menuItemMsg::msgAdd(_GM(slMenu), SL_TAG_SAVE_LABEL,
			SL_SAVELOAD_LABEL_X, SL_SAVELOAD_LABEL_Y,
			SL_SAVELOAD_LABEL_W, SL_SAVELOAD_LABEL_H);
	} else {
		menuItemMsg::msgAdd(_GM(slMenu), SL_TAG_LOAD_TITLE_LABEL,
			SL_TITLE_X, SL_TITLE_Y, SL_TITLE_W, SL_TITLE_H);

		menuItemButton::add(_GM(slMenu), SL_TAG_LOAD,
			SL_SAVELOAD_X, SL_SAVELOAD_Y,
			SL_SAVELOAD_W, SL_SAVELOAD_H, (CALLBACK)cbSave,
			menuItemButton::BTN_TYPE_GM_GENERIC, true);
		menuItemMsg::msgAdd(_GM(slMenu), SL_TAG_LOAD_LABEL,
			SL_SAVELOAD_LABEL_X, SL_SAVELOAD_LABEL_Y,
			SL_SAVELOAD_LABEL_W, SL_SAVELOAD_LABEL_H);
	}

	menuItemButton::add(_GM(slMenu), SL_TAG_CANCEL, SL_CANCEL_X, SL_CANCEL_Y, SL_CANCEL_W, SL_CANCEL_H,
		(CALLBACK)cbCancel, menuItemButton::BTN_TYPE_GM_GENERIC);

	menuItemVSlider::add(_GM(slMenu), SL_TAG_VSLIDER, SL_SLIDER_X, SL_SLIDER_Y, SL_SLIDER_W, SL_SLIDER_H,
		0, (CALLBACK)cbVSlider);

	initializeSlotTables();

	bool buttonGreyed;
	ItemHandlerFunction i_handler;
	if (_GM(currMenuIsSave)) {
		buttonGreyed = false;
		i_handler = (ItemHandlerFunction)menuItemButton::handler;
	} else {
		buttonGreyed = true;
		i_handler = (ItemHandlerFunction)load_Handler;
	}

	for (int32 i = 0; i < MAX_SLOTS_SHOWN; i++) {
		menuItemButton::add(_GM(slMenu), 1001 + i,
			SL_SCROLL_FIELD_X, SL_SCROLL_FIELD_Y + i * SL_SCROLL_LINE_H,
			SL_SCROLL_LINE_W, SL_SCROLL_LINE_H,
			(CALLBACK)cbSlot, menuItemButton::BTN_TYPE_SL_TEXT,
			buttonGreyed && (!_GM(slotInUse)[i]), true,
			_GM(slotTitles)[i], i_handler);
	}

	if (_GM(currMenuIsSave)) {
		// Create thumbnails. One in the original game format for displaying,
		// and the other in the ScummVM format for actually using in the save files
		_GM(saveLoadThumbNail) = menu_CreateThumbnail(&_GM(sizeofThumbData));
		_GM(_thumbnail).free();
		Graphics::createThumbnail(_GM(_thumbnail));

	} else {
		updateThumbnails(0, _GM(slMenu));
		_GM(saveLoadThumbNail) = _GM(menuSprites)[GUI::SaveLoadMenuBase::SL_EMPTY_THUMB_25];
	}

	menuItemMsg::msgAdd(_GM(slMenu), SL_TAG_THUMBNAIL, SL_THUMBNAIL_X, SL_THUMBNAIL_Y,
		SaveLoadMenuBase::SL_THUMBNAIL_W, SaveLoadMenuBase::SL_THUMBNAIL_H, false);

	if (_GM(currMenuIsSave)) {
		//<return> - if a slot has been selected, saves the game
		//<esc> - cancels and returns to the game menu
		guiMenu::configure(_GM(slMenu), (CALLBACK)cbSave, (CALLBACK)cbCancel);
	} else {
		//<return> - if a slot has been selected, loads the selected game
		//<esc> - cancels and returns to the game menu
		guiMenu::configure(_GM(slMenu), (CALLBACK)cbLoad, (CALLBACK)cbCancel);
	}

	vmng_screen_show((void *)_GM(slMenu));
	LockMouseSprite(0);
}

void SaveLoadMenu::destroyMenu(bool saveMenu) {
	if (!_GM(slMenu)) {
		return;
	}

	// Determine whether the screen was the SAVE or the LOAD menu
	if (saveMenu) {
		// If SAVE, there should be a thumbnail to unload
		if (_GM(saveLoadThumbNail)) {
			DisposeHandle(_GM(saveLoadThumbNail)->sourceHandle);
			mem_free(_GM(saveLoadThumbNail));
			_GM(saveLoadThumbNail) = nullptr;
		}
	} else {
		// Else there may be up to 10 somewhere in the list to be unloaded
		for (int32 i = 0; i < MAX_SLOTS; i++) {
			unloadThumbnail(i);
		}
		_GM(saveLoadThumbNail) = nullptr;
	}

	// Destroy the screen
	vmng_screen_dispose(_GM(slMenu));
	guiMenu::destroy(_GM(slMenu));

	// Unload the save/load menu sprites
	guiMenu::unloadSprites();
}

bool SaveLoadMenu::load_Handler(M4::GUI::menuItemButton *myItem, int32 eventType, int32 event, int32 x, int32 y, void **currItem) {
	// Handle the event just like any other button
	const bool handled = menuItemButton::handler(myItem, eventType, event, x, y, currItem);

	// If we've selected a slot, we want the thumbNail to remain on the menu permanently
	if (_GM(slotSelected) >= 0) {
		return handled;
	}

	// But if the event moved the mouse, we want to display the correct thumbNail;
	if ((eventType == EVENT_MOUSE) && ((event == _ME_move) || (event == _ME_L_drag) || (event == _ME_L_release) ||
		(event == _ME_doubleclick_drag) || (event == _ME_doubleclick_release))) {

		// Get the button
		if (!myItem)
			return handled;

		// This determines that we are over the button
		if ((myItem->itemFlags == menuItemButton::BTN_STATE_OVER) || (myItem->itemFlags == menuItemButton::BTN_STATE_PRESS)) {
			// See if the current _GM(saveLoadThumbNail) is pointing to the correct sprite
			if (_GM(saveLoadThumbNail) != _GM(thumbNails)[myItem->specialTag - 1]) {
				_GM(saveLoadThumbNail) = _GM(thumbNails)[myItem->specialTag - 1];
				guiMenu::itemRefresh(nullptr, SL_TAG_THUMBNAIL, (guiMenu *)myItem->myMenu);
			}
		}

		// Else we must determine whether the thumbnail needs to be replaced with the empty thumbnail.
		else {

			// If the mouse has moved outside of the entire range of all 10 buttons,
			//or it is over a button which is not hilited it is to be removed.
			if (menuItem::cursorInsideItem(myItem, x, y)
				|| (x < SL_SCROLL_FIELD_X)
				|| (x > SL_SCROLL_FIELD_X + SL_SCROLL_FIELD_W)
				|| (y < SL_SCROLL_FIELD_Y)
				|| (y > SL_SCROLL_FIELD_Y + SL_SCROLL_FIELD_H)) {

				// Remove the thumbnail
				if (_GM(saveLoadThumbNail)) {
					_GM(saveLoadThumbNail) = _GM(menuSprites)[GUI::SaveLoadMenuBase::SL_EMPTY_THUMB_25];
					guiMenu::itemRefresh(nullptr, SL_TAG_THUMBNAIL, (guiMenu *)myItem->myMenu);
				}
			}
		}
	}

	return handled;
}

void SaveLoadMenu::cbSave(void *, M4::GUI::guiMenu *myMenu) {
	// If (slotSelected < 0) this callback is being executed by pressing return prematurely
	if (_GM(slotSelected) < 0) {
		return;
	}

	// First make the textfield NORM
	menuItemTextField *myText = (menuItemTextField *)guiMenu::getItem(2000, myMenu);
	if (!myText)
		return;

	myText->itemFlags = menuItemTextField::TF_NORM;

	// Set the vars
	_GM(slotInUse)[_GM(slotSelected) - 1] = true;
	Common::strcpy_s(_GM(slotTitles)[_GM(slotSelected) - 1], 80, myText->prompt);

	// Save the game
	const bool saveGameFailed = !g_engine->saveGameFromMenu(_GM(slotSelected),
	                                                        myText->prompt, _GM(_thumbnail));

	// If the save game failed, bring up the err menu
	if (saveGameFailed) {
		// Kill the save menu
		destroyMenu(true);

		// Create the err menu
		ErrorMenu::show(nullptr);

		// Abort this procedure
		return;
	}

	// Kill the save menu
	destroyMenu(true);

	// Shutdown the menu system
	guiMenu::shutdown(true);
}

void SaveLoadMenu::cbLoad(void *, M4::GUI::guiMenu *) {
	// If (slotSelected < 0) this callback is being executed by pressing return prematurely
	if (_GM(slotSelected) < 0) {
		return;
	}

	// Kill the menu
	destroyMenu(false);

	// Shutdown the menu system
	guiMenu::shutdown(false);

	// See if we need to reset the ESC, F2, and F3 hotkeys
	if (_GM(gameMenuFromMain)) {
		AddSystemHotkey(KEY_ESCAPE, Riddle::Hotkeys::escape_key_pressed);
		AddSystemHotkey(KEY_F2, M4::Hotkeys::saveGame);
		AddSystemHotkey(KEY_F3, M4::Hotkeys::loadGame);
	}

	// Start the restore process
	_G(kernel).restore_slot = _GM(slotSelected);
	KernelTriggerType oldMode = _G(kernel).trigger_mode;

	_G(kernel).trigger_mode = KT_DAEMON;
	kernel_trigger_dispatch_now(TRIG_RESTORE_GAME);
	_G(kernel).trigger_mode = oldMode;
}

void SaveLoadMenu::cbCancel(M4::GUI::menuItemButton *, M4::GUI::guiMenu *myMenu) {
	// If a slot has been selected, cancel will re-enable all slots
	if (_GM(slotSelected) >= 0) {
		// Enable the prev buttons
		for (int32 i = 1001; i <= 1010; i++) {
			if (_GM(currMenuIsSave) || _GM(slotInUse)[i - 1001 + _GM(firstSlotIndex)]) {
				menuItemButton::enableButton(nullptr, i, myMenu);
				guiMenu::itemRefresh(nullptr, i, myMenu);
			}
		}

		// Find the textfield and use it's coords to place the button
		menuItem *myItem = guiMenu::getItem(2000, myMenu);
		const int32 x = myItem->x1;
		const int32 y = myItem->y1;
		const int32 w = myItem->x2 - myItem->x1 + 1;
		const int32 h = myItem->y2 - myItem->y1 + 1;

		// Delete the textfield
		guiMenu::itemDelete(myItem, 2000, myMenu);

		// Add the button back in
		if (_GM(currMenuIsSave)) {
			menuItemButton::add(myMenu, 1000 + _GM(slotSelected) - _GM(firstSlotIndex), x, y, w, h,
				(CALLBACK)cbSlot, menuItemButton::BTN_TYPE_SL_TEXT, false, true, _GM(slotTitles)[_GM(slotSelected) - 1]);
		} else {
			menuItemButton::add(myMenu, 1000 + _GM(slotSelected) - _GM(firstSlotIndex), x, y, w, h,
				(CALLBACK)cbSlot, menuItemButton::BTN_TYPE_SL_TEXT, false, true, _GM(slotTitles)[_GM(slotSelected) - 1],
				(ItemHandlerFunction)load_Handler);

			// Remove the thumbnail
			if (_GM(saveLoadThumbNail)) {
				_GM(saveLoadThumbNail) = _GM(menuSprites)[GUI::SaveLoadMenuBase::SL_EMPTY_THUMB_25];
				guiMenu::itemRefresh(nullptr, SL_TAG_THUMBNAIL, myMenu);
			}
		}
		setFirstSlot(_GM(firstSlotIndex), myMenu);

		// Enable the slider
		menuItemVSlider::enableVSlider(nullptr, SL_TAG_VSLIDER, myMenu);
		guiMenu::itemRefresh(nullptr, SL_TAG_VSLIDER, myMenu);

		// Disable the save/load button
		if (_GM(currMenuIsSave)) {
			menuItemButton::disableButton(nullptr, SL_TAG_SAVE, myMenu);
			guiMenu::itemRefresh(nullptr, SL_TAG_SAVE, myMenu);
		} else {
			menuItemButton::disableButton(nullptr, SL_TAG_LOAD, myMenu);
			guiMenu::itemRefresh(nullptr, SL_TAG_LOAD, myMenu);
		}

		// Reset the slot selected var
		_GM(slotSelected) = -1;

	} else {
		// Otherwise, back to the game menu

		// Destroy the menu
		destroyMenu(_GM(currMenuIsSave));

		if (_GM(saveLoadFromHotkey)) {
			// Shutdown the menu system
			guiMenu::shutdown(true);
		} else {
			// Create the game menu
			GameMenu::show(nullptr);
		}
	}

	_GM(buttonClosesDialog) = true;
}

void SaveLoadMenu::cbSlot(M4::GUI::menuItemButton *myButton, M4::GUI::guiMenu *myMenu) {
	// Verify params
	if (!myMenu || !myButton)
		return;

	// Get the button
	char prompt[80];
	Common::strcpy_s(prompt, 80, myButton->prompt);
	const int32 specialTag = myButton->specialTag;

	// Set the globals
	_GM(slotSelected) = myButton->specialTag;
	_GM(deleteSaveDesc) = true;

	// Disable all other buttons
	for (int32 i = 1001; i <= 1010; i++) {
		if (i != myButton->tag) {
			menuItemButton::disableButton(nullptr, i, myMenu);
			guiMenu::itemRefresh(nullptr, i, myMenu);
		}
	}

	// Get the slot coords, and delete it
	const int32 x = myButton->x1;
	const int32 y = myButton->y1;
	const int32 w = myButton->x2 - myButton->x1 + 1;
	const int32 h = myButton->y2 - myButton->y1 + 1;
	guiMenu::itemDelete(myButton, -1, myMenu);

	if (_GM(currMenuIsSave)) {
		// Replace the current button with a textfield
		if (!strcmp(prompt, "<empty>")) {
			menuItemTextField::add(myMenu, 2000, x, y, w, h, menuItemTextField::TF_OVER,
				nullptr, specialTag, (CALLBACK)cbSave, true);
		} else {
			menuItemTextField::add(myMenu, 2000, x, y, w, h, menuItemTextField::TF_OVER,
				prompt, specialTag, (CALLBACK)cbSave, true);
		}
	} else {
		menuItemTextField::add(myMenu, 2000, x, y, w, h, menuItemTextField::TF_NORM,
			prompt, specialTag, (CALLBACK)cbLoad, true);
	}

	// Disable the slider
	menuItemVSlider::disableVSlider(nullptr, SL_TAG_VSLIDER, myMenu);
	guiMenu::itemRefresh(nullptr, SL_TAG_VSLIDER, myMenu);

	// Enable the save/load button
	if (_GM(currMenuIsSave)) {
		menuItemButton::enableButton(nullptr, SL_TAG_SAVE, myMenu);
		guiMenu::itemRefresh(nullptr, SL_TAG_SAVE, myMenu);
	} else {
		menuItemButton::enableButton(nullptr, SL_TAG_LOAD, myMenu);
		guiMenu::itemRefresh(nullptr, SL_TAG_LOAD, myMenu);
	}
}

void SaveLoadMenu::cbVSlider(M4::GUI::menuItemVSlider *myItem, M4::GUI::guiMenu *myMenu) {
	if (!myMenu || !myItem)
		return;

	if ((myItem->itemFlags & menuItemVSlider::VS_COMPONENT) != menuItemVSlider::VS_THUMB) {
		bool redraw = (DrawFunction)false;
		switch (myItem->itemFlags & menuItemVSlider::VS_COMPONENT) {
		case menuItemVSlider::VS_UP:
			if (_GM(firstSlotIndex) > 0) {
				_GM(firstSlotIndex)--;
				redraw = (DrawFunction)true;
			}
			break;

		case menuItemVSlider::VS_PAGE_UP:
			if (_GM(firstSlotIndex) > 0) {
				_GM(firstSlotIndex) = imath_max(_GM(firstSlotIndex) - 10, 0);
				redraw = (DrawFunction)true;
			}
			break;

		case menuItemVSlider::VS_PAGE_DOWN:
			if (_GM(firstSlotIndex) < 89) {
				_GM(firstSlotIndex) = imath_min(_GM(firstSlotIndex) + 10, 89);
				redraw = (DrawFunction)true;
			}
			break;

		case menuItemVSlider::VS_DOWN:
			if (_GM(firstSlotIndex) < 89) {
				_GM(firstSlotIndex)++;
				redraw = (DrawFunction)true;
			}
			break;

		default:
			break;
		}

		// See if we were able to set a new first slot index
		if (redraw) {
			setFirstSlot(_GM(firstSlotIndex), myMenu);

			// Calculate the new percent
			myItem->percent = (_GM(firstSlotIndex) * 100) / 89;

			// Calculate the new thumbY
			myItem->thumbY = myItem->minThumbY +
				((myItem->percent * (myItem->maxThumbY - myItem->minThumbY)) / 100);

			// Redraw the slider
			guiMenu::itemRefresh(myItem, -1, myMenu);
		}
	} else {
		// Else the callback came from the thumb - set the _GM(firstSlotIndex) based on the slider percent
		_GM(firstSlotIndex) = (myItem->percent * 89) / 100;
		setFirstSlot(_GM(firstSlotIndex), myMenu);
	}
}

/*------------------ ERROR MENU METHODS ------------------*/

enum error_menu_sprites {
	EM_DIALOG_BOX,

	EM_RETURN_BTN_NORM,
	EM_RETURN_BTN_OVER,
	EM_RETURN_BTN_PRESS,

	EM_TOTAL_SPRITES = 5
};

#define ERROR_MENU_X	237
#define ERROR_MENU_Y	191

#define EM_TAG_RETURN	1
#define EM_RETURN_X		12
#define EM_RETURN_Y		50
#define EM_RETURN_W		26
#define EM_RETURN_H		26

void ErrorMenu::show(RGB8 *myPalette) {
	if (!_G(menuSystemInitialized)) {
		guiMenu::initialize(myPalette);
	}

	// Load in the game menu sprites
	if (!guiMenu::loadSprites("errmenu", EM_TOTAL_SPRITES)) {
		return;
	}

	_GM(errMenu) = guiMenu::create(_GM(menuSprites)[EM_DIALOG_BOX],
		ERROR_MENU_X, ERROR_MENU_Y, MENU_DEPTH | SF_GET_ALL | SF_BLOCK_ALL | SF_IMMOVABLE);
	if (!_GM(errMenu)) {
		return;
	}

	// Get the menu buffer
	Buffer *myBuff = _GM(errMenu)->menuBuffer->get_buffer();
	if (!myBuff) {
		return;
	}

	//write the err message
	gr_font_set_color(96);
	gr_font_write(myBuff, "Save game failed!", 48, 8, 0, -1);

	gr_font_write(myBuff, "A disk error has", 48, 23, 0, -1);
	gr_font_write(myBuff, "occurred.", 48, 33, 0, -1);

	gr_font_write(myBuff, "Please ensure you", 48, 48, 0, -1);
	gr_font_write(myBuff, "have write access", 48, 58, 0, -1);
	gr_font_write(myBuff, "and sufficient", 48, 68, 0, -1);
	gr_font_write(myBuff, "disk space (40k).", 48, 78, 0, -1);

	_GM(errMenu)->menuBuffer->release();

	// Add the done button
	menuItemButton::add(_GM(errMenu), EM_TAG_RETURN, EM_RETURN_X, EM_RETURN_Y,
		EM_RETURN_W, EM_RETURN_H, cbDone);

	// Configure the game so pressing <esc> will cause the menu to disappear and the gamemenu to reappear
	guiMenu::configure(_GM(errMenu), cbDone, cbDone);

	vmng_screen_show((void *)_GM(errMenu));
	LockMouseSprite(0);
}

void ErrorMenu::cbDone(void *, void *) {
	// Destroy the game menu
	destroyMenu();

	// Shutdown the menu system
	guiMenu::shutdown(true);
}


void ErrorMenu::destroyMenu() {
	if (!_GM(errMenu)) {
		return;
	}

	// Remove the screen from the gui
	vmng_screen_dispose(_GM(errMenu));

	// Destroy the menu resources
	guiMenu::destroy(_GM(errMenu));

	// Unload the menu sprites
	guiMenu::unloadSprites();
}

/*-------------------- ACCESS METHODS --------------------*/

void CreateGameMenu(RGB8 *myPalette) {
	if (!player_commands_allowed() || !INTERFACE_VISIBLE ||
		_G(pal_fade_in_progress) || _G(menuSystemInitialized)) {
		return;
	}

	GameMenu::show(myPalette);
}


void CreateF2SaveMenu(RGB8 *myPalette) {
	if (!player_commands_allowed() || !INTERFACE_VISIBLE ||
		_G(pal_fade_in_progress) || _G(menuSystemInitialized)) {
		return;
	}

	_GM(saveLoadFromHotkey) = true;
	_GM(gameMenuFromMain) = false;
	SaveLoadMenu::show(myPalette, true);
}

void CreateLoadMenu(RGB8 *myPalette) {
	_GM(saveLoadFromHotkey) = false;
	SaveLoadMenu::show(myPalette, false);
}

void CreateLoadMenuFromMain(RGB8 *myPalette) {
	if (_G(pal_fade_in_progress) || _G(menuSystemInitialized)) {
		return;
	}

	_GM(saveLoadFromHotkey) = true;
	_GM(gameMenuFromMain) = true;
	SaveLoadMenu::show(myPalette, false);
}

void CreateF3LoadMenu(RGB8 *myPalette) {
	if (!player_commands_allowed() || !INTERFACE_VISIBLE ||
		_G(pal_fade_in_progress) || _G(menuSystemInitialized)) {
		return;
	}

	_GM(saveLoadFromHotkey) = true;
	_GM(gameMenuFromMain) = false;
	SaveLoadMenu::show(myPalette, false);
}
} // namespace GUI
} // namespace Riddle
} // namespace M4