/* 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 SWORD1_SCREEN_H
#define SWORD1_SCREEN_H

#include "sword1/sworddefs.h"
#include "common/mutex.h"

class OSystem;

namespace Sword1 {

#define MAX_FORE 20
#define MAX_BACK 20
#define MAX_SORT 20

struct SortSpr {
	int32 id, y;
};

struct RoomDef {
	int     totalLayers;
	int     sizeX;
	int     sizeY;
	int     gridWidth;  //number of 16*16 grid blocks across - including off screen edges.
	uint32  layers[4];
	uint32  grids[3];
	uint32  palettes[2];
	uint32  parallax[2];
};

struct PSXDataCache { // Cache for PSX screen, to avoid decompressing background at every screen update
	uint8 *decodedBackground;
	uint8 *extPlxCache; // If this screen requires an external parallax, save it here
};

#define SCRNGRID_X 16
#define SCRNGRID_Y 8
#define SHRINK_BUFFER_SIZE 50000
#define RLE_BUFFER_SIZE 50000

#define FLASH_RED 0
#define FLASH_BLUE 1
#define BORDER_YELLOW 2
#define BORDER_GREEN 3
#define BORDER_PURPLE 4
#define BORDER_BLACK 5
#define TEXT_WHITE 6

class SwordEngine;
class ResMan;
class ObjectMan;
class Text; // Text objects use sprites that are created internally at run-time
			// the buffer belongs to Text, so we need a reference here.

class Screen {
	friend class Text;
public:
	Screen(OSystem *system, SwordEngine *vm, ResMan *pResMan, ObjectMan *pObjMan);
	~Screen();
	void clearScreen();
	void useTextManager(Text *pTextMan);
	void draw();
	void initFadePaletteServer();

	void quitScreen();
	void newScreen(uint32 screen);

	void setScrolling(int16 offsetX, int16 offsetY);
	void addToGraphicList(uint8 listId, uint32 objId);

	void startFadePaletteDown(int speed);
	void startFadePaletteUp(int speed);
	void fadePalette();
	void fnSetPalette(uint8 start, uint16 length, uint32 id);
	void fnSetFadeTargetPalette(uint8 start, uint16 length, uint32 id, int singleColor = -1);
	int16 stillFading();
	void fullRefresh(bool soft = false);
	void setNextFadeOutToBlack();

	bool showScrollFrame();
	void updateScreen();
	void showFrame(uint16 x, uint16 y, uint32 resId, uint32 frameNo, const byte *fadeMask = nullptr, int8 fadeStatus = 0);

	void fnSetParallax(uint32 screen, uint32 resId);
	void fnFlash(uint8 color);

	static void decompressHIF(uint8 *src, uint8 *dest);

	void printDebugLine(uint8 *ascii, uint8 first, int x, int y);

	// Functions used by the router debug visualization routines
	void plotLine(int32 x1, int32 y1, int32 x2, int32 y2, uint8 color);
	void plotPoint(int32 x, int32 y, uint8 color);
	void bresenhamLine(int32 x1, int32 y1, int32 x2, int32 y2, uint8 color);

	Common::Mutex _screenAccessMutex; // To coordinate actions between the main thread and the palette fade thread

private:
	// The original values are 6-bit RGB numbers, so they have to be shifted,
	// except for white, which for some reason has to stay unshifted in order
	// to work correctly.
	const uint8 _white[3]  = {      63,      63,      63 };
	const uint8 _red[3]    = { 63 << 2, 0  << 2, 0  << 2 };
	const uint8 _blue[3]   = { 0  << 2, 0  << 2, 63 << 2 };
	const uint8 _yellow[3] = { 63 << 2, 63 << 2, 0  << 2 };
	const uint8 _green[3]  = { 0  << 2, 63 << 2, 0  << 2 };
	const uint8 _purple[3] = { 32 << 2, 0  << 2, 32 << 2 };
	const uint8 _black[3]  = { 0  << 2, 0  << 2, 0  << 2 };
	//const uint8 _grey[3]   = { 32 << 2, 32 << 2, 32 << 2 };

	struct PaletteFadeInfo {
		int16 paletteStatus;
		int16 paletteIndex;
		int16 paletteCount;
		int16 fadeCount;
		uint8 srcPalette[256 * 3];
		uint8 dstPalette[256 * 3];
	};

	PaletteFadeInfo _paletteFadeInfo;

	void verticalMask(uint16 x, uint16 y, uint16 bWidth, uint16 bHeight);
	void blitBlockClear(uint16 x, uint16 y, uint8 *data);
	void renderParallax(uint8 *data);
	void processImage(uint32 id);
	void spriteClipAndSet(uint16 *pSprX, uint16 *pSprY, uint16 *sprWidth, uint16 *sprHeight, uint16 *incr);
	void drawSprite(uint8 *sprData, uint16 sprX, uint16 sprY, uint16 sprWidth, uint16 sprHeight, uint16 sprPitch);
	void drawPsxHalfShrinkedSprite(uint8 *sprData, uint16 sprX, uint16 sprY, uint16 sprWidth, uint16 sprHeight, uint16 sprPitch);
	void drawPsxFullShrinkedSprite(uint8 *sprData, uint16 sprX, uint16 sprY, uint16 sprWidth, uint16 sprHeight, uint16 sprPitch);
	uint8 *psxBackgroundToIndexed(uint8 *psxBackground, uint32 bakXres, uint32 bakYres);
	uint8 *psxShrinkedBackgroundToIndexed(uint8 *psxBackground, uint32 bakXres, uint32 bakYres);
	void fetchPsxParallaxSize(uint8 *psxParallax, uint16 *paraSizeX, uint16 *paraSizeY);
	void drawPsxParallax(uint8 *psxParallax, uint16 paraScrlX, uint16 scrnScrlX, uint16 scrnWidth);
	void decompressRLE7(uint8 *src, uint32 compSize, uint8 *dest);
	void decompressRLE0(uint8 *src, uint32 compSize, uint8 *dest);
	void decompressTony(uint8 *src, uint32 compSize, uint8 *dest);
	void fastShrink(uint8 *src, uint32 width, uint32 height, uint32 scale, uint8 *dest);

	void flushPsxCache();

	OSystem *_system;
	SwordEngine *_vm;
	ResMan *_resMan;
	ObjectMan *_objMan;
	Text *_textMan;

	uint16 _currentScreen;
	uint8  *_screenBuf;
	uint8  *_screenGrid;
	uint16 *_layerGrid[4];
	uint8  *_layerBlocks[4];
	uint8  *_parallax[2];
	uint8  _rleBuffer[RLE_BUFFER_SIZE];
	uint8  _shrinkBuffer[SHRINK_BUFFER_SIZE];
	bool   _fullRefresh;
	bool   _updatePalette;
	uint16 _oldScrollX, _oldScrollY; // for drawing additional frames

	PSXDataCache _psxCache; // Cache used for PSX backgrounds

	uint32  _foreList[MAX_FORE];
	uint32  _backList[MAX_BACK];
	SortSpr _sortList[MAX_SORT];
	uint8   _foreLength, _backLength, _sortLength;
	uint16  _scrnSizeX, _scrnSizeY, _gridSizeX, _gridSizeY;

	static RoomDef _roomDefTable[TOTAL_ROOMS]; // from ROOMS.C (not const, see fnSetParallax)

	uint8 _targetPalette[256 * 3];
	uint8 _currentPalette[256 * 3]; // for fading
	uint8 _zeroPalette[256 * 3];

	bool _forceNextFadeOutToBlack = false;
};

} // End of namespace Sword1

#endif //BSSCREEN_H