/* ScummVM - Scumm Interpreter
 * Copyright (C) 2004-2005 The ScummVM project
 *
 * The ReInherit Engine is (C)2000-2003 by Daniel Balsom.
 *
 * 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 2
 * 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * $Header$
 *
 */

// Background animation management module private header

#ifndef SAGA_ANIMATION_H_
#define SAGA_ANIMATION_H_

#include "saga/stream.h"

namespace Saga {

#define MAX_ANIMATIONS 7
#define DEFAULT_FRAME_TIME 140

#define SAGA_FRAME_HEADER_LEN (_vm->getFeatures() & GF_MAC_RESOURCES ? 13 : 12)

#define SAGA_FRAME_START 0xF
#define SAGA_FRAME_END 0x3F
#define SAGA_FRAME_REPOSITION 0x30
#define SAGA_FRAME_ROW_END 0x2F
#define SAGA_FRAME_LONG_COMPRESSED_RUN	0x20
#define SAGA_FRAME_LONG_UNCOMPRESSED_RUN	0x10
#define SAGA_FRAME_COMPRESSED_RUN 0x80
#define SAGA_FRAME_UNCOMPRESSED_RUN 0x40
#define SAGA_FRAME_EMPTY_RUN 0xC0

// All animation resources begin with an ANIMATION_HEADER
// at 0x00, followed by a RLE code stream

struct FRAME_HEADER {
	int xStart;
	int yStart;

	int xPos;
	int yPos;

	int width;
	int height;
};

enum AnimationState {
	ANIM_PLAYING = 0x01,
	ANIM_PAUSE = 0x02,
	ANIM_STOPPING = 0x04,
	ANIM_ENDSCENE = 0x80	// When animation ends, dispatch scene end event
};

// Animation info array member
struct AnimationData {
	byte *resourceData;
	size_t resourceLength;

	uint16 magic;

	uint16 screenWidth;
	uint16 screenHeight;

	byte unknown06;
	byte unknown07;

	uint16 maxFrame;
	uint16 loopFrame;

	uint16 start;

	uint16 currentFrame;
	size_t *frameOffsets;

	uint16 completed;
	uint16 cycles;
	
	const byte *cur_frame_p;
	size_t cur_frame_len;

	int frameTime;

	AnimationState state;
	int16 linkId;
	uint16 flags;

	AnimationData(const byte *animResourceData, size_t animResourceLength) {
		memset(this, 0, sizeof(*this)); 
		resourceLength = animResourceLength;
		resourceData = (byte*)malloc(animResourceLength);
		memcpy(resourceData, animResourceData, animResourceLength);
	}
	~AnimationData() {
		free(frameOffsets);
		free(resourceData);
	}
};

class Anim {
public:
	Anim(SagaEngine *vm);
	~Anim(void);

	uint16 load(const byte *animResourceData, size_t animResourceLength);
	void freeId(uint16 animId);
	void play(uint16 animId, int vectorTime, bool playing = true);
	void link(int16 animId1, int16 animId2);
	void setFlag(uint16 animId, uint16 flag);
	void clearFlag(uint16 animId, uint16 flag);
	void setFrameTime(uint16 animId, int time);
	void reset(void);
	void animInfo(void);
	void setCycles(uint16 animId, int cycles);
	void stop(uint16 animId);
	void finish(uint16 animId);
	void resume(uint16 animId, int cycles);
	int16 getCurrentFrame(uint16 animId);

private:
	void ITE_DecodeFrame(AnimationData *anim, size_t frameOffset, byte *buf, size_t bufLength);
	int IHNM_DecodeFrame(byte *decode_buf, size_t decode_buf_len, const byte *thisf_p,
					size_t thisf_len, const byte **nextf_p, size_t *nextf_len);
	void fillFrameOffsets(AnimationData *anim);

	void validateAnimationId(uint16 animId) {
		if (animId >= MAX_ANIMATIONS) {
			error("validateAnimationId: animId out of range");
		}
		if (_animations[animId] == NULL) {
			error("validateAnimationId: animId=%i unassigned", animId);
		}
	}

	AnimationData* getAnimation(uint16 animId) {
		validateAnimationId(animId);
		return _animations[animId];
	}

	uint16 getAnimationCount() const {
		uint16 i = 0;
		for (; i < MAX_ANIMATIONS; i++) {
			if (_animations[i] == NULL) {
				break;
			}
		}
		return i;
	}

	SagaEngine *_vm;
	AnimationData *_animations[MAX_ANIMATIONS];

};

} // End of namespace Saga

#endif				/* ANIMATION_H_ */