/* 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 DRAGONS_BACKGROUND_H
#define DRAGONS_BACKGROUND_H

#include "common/rect.h"
#include "common/system.h"
#include "dragons/bigfile.h"
#include "dragons/dragonrms.h"
#include "dragons/screen.h"

namespace Dragons {
class PriorityLayer;
class Background;

void drawTileToSurface(Graphics::Surface *surface, byte *palette, byte *tile, uint32 x, uint32 y);

class BackgroundResourceLoader {
private:
	BigfileArchive *_bigFileArchive;
	DragonRMS *_dragonRMS;
public:
	BackgroundResourceLoader(BigfileArchive *bigFileArchive, DragonRMS *dragonRMS);
	Background *load(uint32 sceneId);
	Background *load(const char *filename);
};

typedef struct {
	int16 _y;
	int16 _priority;
} ScaleBand;

class ScaleLayer {
public:
	ScaleLayer();
	~ScaleLayer();
	void load(Common::SeekableReadStream &stream);
	uint16 getScale(uint16 y);
	void backup();
	void restore();
	void clearAll();
	void setValue(uint8 index, int16 y, int16 value);

private:
	ScaleBand _bands[32];
	ScaleBand *_savedBands;
};

struct TileMap {
	uint16 w;
	uint16 h;
	uint32 size;
	byte *map;
	uint16 tileIndexOffset;

	TileMap() {
		w = 0;
		h = 0;
		size = 0;
		map = nullptr;
		tileIndexOffset = 0;
	}
};

class Background {
private:
	byte *_data;
	byte *_tileDataOffset;
	TileMap _tileMap[4];
	PriorityLayer *_priorityLayer;
	ScaleLayer _scaleLayer;
	byte _palette[512];
	Graphics::Surface *_layerSurface[3];
	Common::Point *_points2;
	uint8 _layerPriority[3];
	Common::Point _layerOffset[3];
	AlphaBlendMode _layerAlphaMode[3];

public:
	Background();
	~Background();

	bool load(byte *dataStart, uint32 size);
	uint16 getWidth();
	uint16 getHeight();
	Graphics::Surface *getBgLayer() { return _layerSurface[0]; }
	Graphics::Surface *getMgLayer() { return _layerSurface[1]; }
	Graphics::Surface *getFgLayer() { return _layerSurface[2]; }
	uint8 getBgLayerPriority() { return _layerPriority[0]; }
	uint8 getMgLayerPriority() { return _layerPriority[1]; }
	uint8 getFgLayerPriority() { return _layerPriority[2]; }

	void setBgLayerPriority(uint8 newPriority) { _layerPriority[0] = newPriority; }
	void setMgLayerPriority(uint8 newPriority) { _layerPriority[1] = newPriority; }
	void setFgLayerPriority(uint8 newPriority) { _layerPriority[2] = newPriority; }

	int16 getPriorityAtPoint(Common::Point pos);
	Common::Point getPoint2(uint32 pointIndex);
	byte *getPalette() { return _palette; }

	void overlayPriorityTileMap(byte *data, int16 x, int16 y, int16 w, int16 h);
	void restorePriorityTileMap(int16 x, int16 y, int16 w, int16 h);
	void overlayImage(uint16 layerNum, byte *data, int16 x, int16 y, int16 w, int16 h);
	void restoreTiles(uint16 layerNum, int16 x, int16 y, int16 w, int16 h);
	void setPalette(byte *newPalette);
	void setLayerOffset(uint8 layerNumber, Common::Point offset);
	Common::Point getLayerOffset(uint8 layerNumber);
	ScaleLayer *getScaleLayer() { return &_scaleLayer; }

	Dragons::AlphaBlendMode getLayerAlphaMode(uint8 layerNumber);
	void setLayerAlphaMode(uint8 layerNumber, Dragons::AlphaBlendMode mode);

private:
	Common::Point *loadPoints(Common::SeekableReadStream &stream);
	Graphics::Surface *initGfxLayer(TileMap &tileMap);
	void loadGfxLayer(Graphics::Surface *surface, TileMap &tileMap, byte *tiles);

};

class PriorityLayer {
public:
	void load(TileMap &tileMap, byte *tiles);
	int16 getPriority(Common::Point pos);
	void overlayTileMap(byte *data, int16 x, int16 y, int16 w, int16 h);
	void restoreTileMap(int16 x, int16 y, int16 w, int16 h);
protected:
	int16 _width, _height;
	int16 _mapWidth, _mapHeight;
	byte *_map, *_values;
	byte *_mapBase;
};

} // End of namespace Dragons

#endif //DRAGONS_BACKGROUND_H