/* 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/>.
 *
 */

#ifndef XEEN_INTERFACE_H
#define XEEN_INTERFACE_H

#include "common/scummsys.h"
#include "mm/xeen/dialogs/dialogs.h"
#include "mm/xeen/interface_minimap.h"
#include "mm/xeen/interface_scene.h"
#include "mm/xeen/party.h"
#include "mm/xeen/window.h"

namespace MM {
namespace Xeen {

class XeenEngine;

enum Obscurity {
	OBSCURITY_BLACK = 0,
	OBSCURITY_3 = 1,
	OBSCURITY_2 = 2,
	OBSCURITY_1 = 3,
	OBSCURITY_NONE = 4
};

enum IconsMode {
	ICONS_STANDARD = 0,
	ICONS_COMBAT = 1
};

enum FallState {
	FALL_NONE = 0,
	FALL_IN_PROGRESS = 1,
	FALL_START = 2
};

#define HILIGHT_CHAR_DISABLED -2
#define HILIGHT_CHAR_NONE -1

/**
 * Class responsible for drawing the images of the characters in the party
 */
class PartyDrawer {
private:
	XeenEngine *_vm;
	SpriteResource _dseFace;
	SpriteResource _hpSprites;
	SpriteResource _restoreSprites;
	int _hiliteChar;
public:
	PartyDrawer(XeenEngine *vm);

	void drawParty(bool updateFlag);

	/**
	 * Highlights the specified character in the party display at the bottom of the screen
	 * @param charId		Character number
	 */
	void highlightChar(int charId);

	/**
	 * Highlights the specified character in the party display at the bottom of the screen
	 * @param c		Character to highlight
	 */
	void highlightChar(const Character *c);

	void unhighlightChar();

	void resetHighlight();

private:
	void drawHitPoints(int charIndex);
};

/**
 * Implements the main in-game interface
 */
class Interface: public ButtonContainer, public InterfaceScene,
		public InterfaceMinimap, public PartyDrawer {
private:
	XeenEngine *_vm;
	SpriteResource _uiSprites;
	SpriteResource _borderSprites;
	SpriteResource _spellFxSprites;
	SpriteResource _fecpSprites;
	SpriteResource _blessSprites;
	SpriteResource _stdIcons;
	SpriteResource _combatIcons;
	Graphics::ManagedSurface _fallSurface;
	bool _buttonsLoaded;
	int _steppingFX;
	int _blessedUIFrame;
	int _powerShieldUIFrame;
	int _holyBonusUIFrame;
	int _heroismUIFrame;
	int _flipUIFrame;

	void loadSprites();

	void setupBackground();

	/**
	 * Sets the main user interface icons for either standard mode or combat mode
	 */
	void setMainButtons(IconsMode mode = ICONS_STANDARD);

	void chargeStep();

	/**
	 * Handles incrementing game time
	 */
	void stepTime();

	void doStepCode();

	/**
	 * Check movement in the given direction
	 */
	bool checkMoveDirection(int key);

	/**
	 * Handle doing the falling
	 */
	void handleFalling();

	/**
	 * Sets up a passed surface with a double height combination of the previously
	 * saved scene background and the newly rendered (but not displayed) scene
	 * below it. This will be used by the fall sequence to vertically shift from the
	 * prior "upper" scene to the lower ground scene
	 */
	void setupFallSurface(bool isTop);

	/**
	 * Handles a frame of falling animation
	 */
	void fall(int yp);

	/**
	 * Shake the screen
	 * @param count		Number of times
	 */
	void shake(int count);

	/**
	 * Select next character or monster to be attacking
	 */
	void nextChar();
public:
	Obscurity _obscurity;
	FallState _falling;
	int _face1State, _face2State;
	int _face1UIFrame, _face2UIFrame;
	int _spotDoorsUIFrame;
	int _dangerSenseUIFrame;
	int _levitateUIFrame;
	bool _upDoorText;
	Common::String _screenText;
	byte _tillMove;
	int _charFX[6];
	IconsMode _iconsMode;
public:
	Interface(XeenEngine *vm);

	~Interface() override {}

	void setup();

	void manageCharacters(bool soundPlayed);

	void startup();

	void mainIconsPrint();

	/**
	 * Start the party falling
	 */
	void startFalling(bool v);

	/**
	 * Waits for a keypress or click, whilst still allowing the game scene to
	 * be animated.
	 */
	void perform();

	void rest();

	/**
	 * Handles bash actions
	 */
	void bash(const Common::Point &pt, Direction direction);

	/**
	 * Handles drawing the elements of the interface and game scene
	 * @param updateFlag		Updates UI windows 1 & 3
	 * @param pauseFlag			Does a brief pause at the end of drawing
	 */
	void draw3d(bool updateFlag, bool pauseFlag = true);

	/**
	 * Draw the display borders
	 */
	void assembleBorder();

	void doCombat();

	void spellFX(Character *c);

	/**
	 * Optionally obscures the scene due to low light conditions
	 */
	void obscureScene(Obscurity obscurity);
};

} // End of namespace Xeen
} // End of namespace MM

#endif