/* 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 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

#ifndef PRINCE_SCRIPT_H
#define PRINCE_SCRIPT_H

#include "common/random.h"
#include "common/endian.h"
#include "common/array.h"

#include "prince/flags.h"

namespace Common {
	class SeekableReadStream;
}

namespace Prince {

class PrinceEngine;
class Animation;
struct Anim;
struct BackgroundAnim;
struct Mask;

namespace Detail {
	template <typename T> T LittleEndianReader(void *data);
	template <> inline uint8 LittleEndianReader<uint8>(void *data) { return *(uint8*)(data); }
	template <> inline uint16 LittleEndianReader<uint16>(void *data) { return READ_LE_UINT16(data); }
	template <> inline uint32 LittleEndianReader<uint32>(void *data) { return READ_LE_UINT32(data); }
}

class Room {
public:
	Room();
	int _mobs; // mob flag offset
	int _backAnim; // offset to array of animation numbers
	int _obj; // offset to array of object numbers
	int _nak; // offset to array of masks
	int _itemUse;
	int _itemGive;
	int _walkTo; // offset to array of WALKTO events or 0
	int _examine; // offset to array of EXAMINE events or 0
	int _pickup;
	int _use;
	int _pushOpen;
	int _pullClose;
	int _talk;
	int _give;

	bool loadFromStream(Common::SeekableReadStream &stream);
	bool loadRoom(byte *roomData);

private:

	typedef void (Room::*LoadingStep)(Common::SeekableReadStream &stream);

	void nextLoadStep(Common::SeekableReadStream &stream, LoadingStep step);

	void loadMobs(Common::SeekableReadStream &stream);
	void loadBackAnim(Common::SeekableReadStream &stream);
	void loadObj(Common::SeekableReadStream &stream);
	void loadNak(Common::SeekableReadStream &stream);
	void loadItemUse(Common::SeekableReadStream &stream);
	void loadItemGive(Common::SeekableReadStream &stream);
	void loadWalkTo(Common::SeekableReadStream &stream);
	void loadExamine(Common::SeekableReadStream &stream);
	void loadPickup(Common::SeekableReadStream &stream);
	void loadUse(Common::SeekableReadStream &stream);
	void loadPushOpen(Common::SeekableReadStream &stream);
	void loadPullClose(Common::SeekableReadStream &stream);
	void loadTalk(Common::SeekableReadStream &stream);
	void loadGive(Common::SeekableReadStream &stream);
};


class Script {
public:
	Script(PrinceEngine *vm);
	~Script();

	struct ScriptInfo {
		int rooms;
		int startGame;
		int restoreGame;
		int stdExamine;
		int stdPickup;
		int stdUse;
		int stdOpen;
		int stdClose;
		int stdTalk;
		int stdGive;
		int usdCode;
		int invObjExam;
		int invObjUse;
		int invObjUU;
		int stdUseItem;
		int lightSources;
		int specRout;
		int invObjGive;
		int stdGiveItem;
		int goTester;
	};

	bool loadFromStream(Common::SeekableReadStream &stream);

	template <typename T>
	T read(uint32 address) {
		assert((_data + address + sizeof(T)) <= (_data + _dataSize));
		return Detail::LittleEndianReader<T>(&_data[address]);
	}

	uint32 getStartGameOffset();
	int16 getLightX(int locationNr);
	int16 getLightY(int locationNr);
	int32 getShadowScale(int locationNr);
	uint8 *getRoomOffset(int locationNr);
	void installBackAnims(Common::Array<BackgroundAnim> &_backanimList, int offset);
	void installSingleBackAnim(Common::Array<BackgroundAnim> &_backanimList, int offset);
	bool loadAllMasks(Common::Array<Mask> &maskList, int offset);

	int scanInvObjExamEvents(int mobMask);

	const char *getString(uint32 offset) {
		return (const char *)(&_data[offset]);
	}

private:
	PrinceEngine *_vm;
	uint8 *_data;
	uint32 _dataSize;
	Common::Array<Room> _roomList;
	ScriptInfo _scriptInfo;
};

class InterpreterFlags {
public:
	InterpreterFlags();

	void setFlagValue(Flags::Id flag, uint16 value);
	uint16 getFlagValue(Flags::Id flag);

	void resetAllFlags();

	static const uint16 FLAG_MASK = 0x8000;

private:
	static const uint16 MAX_FLAGS = 2000;
	int16 _flags[MAX_FLAGS];
};

class Interpreter {
public:
	Interpreter(PrinceEngine *vm, Script *script, InterpreterFlags *flags);

	void stopBg() { _bgOpcodePC = 0; }

	void step();

private:
	PrinceEngine *_vm;
	Script *_script;
	InterpreterFlags *_flags;

	uint32 _currentInstruction;

	uint32 _bgOpcodePC;
	uint32 _fgOpcodePC;

	uint16 _lastOpcode;
	uint32 _lastInstruction;
	byte _result;

	bool _opcodeNF; // break interpreter loop

	static const uint32 _STACK_SIZE = 500;
	uint32 _stack[_STACK_SIZE];
	uint8 _stacktop;
	//uint8 _savedStacktop;
	uint32 _waitFlag;

	const byte *_string;
	uint32 _currentString;
	const char *_mode;

	// Helper functions
	uint32 step(uint32 opcodePC);

	uint16 readScriptFlagValue();
	Flags::Id readScriptFlagId();

	// instantiation not needed here
	template <typename T> T readScript();

	void debugInterpreter(const char *s, ...);
	void SetVoice(uint32 slot);

	typedef void (Interpreter::*OpcodeFunc)();
	static OpcodeFunc _opcodes[];

	// Keep opcode handlers names as they are in original code 
	// it easier to switch back and forth
	void O_WAITFOREVER();
	void O_BLACKPALETTE();
	void O_SETUPPALETTE();
	void O_INITROOM();
	void O_SETSAMPLE();
	void O_FREESAMPLE();
	void O_PLAYSAMPLE();
	void O_PUTOBJECT();
	void O_REMOBJECT();
	void O_SHOWANIM();
	void O_CHECKANIMEND();
	void O_FREEANIM();
	void O_CHECKANIMFRAME();
	void O_PUTBACKANIM();
	void O_REMBACKANIM();
	void O_CHECKBACKANIMFRAME();
	void O_FREEALLSAMPLES();
	void O_SETMUSIC();
	void O_STOPMUSIC();
	void O__WAIT();
	void O_UPDATEOFF();
	void O_UPDATEON();
	void O_UPDATE ();
	void O_CLS();
	void O__CALL();
	void O_RETURN();
	void O_GO();
	void O_BACKANIMUPDATEOFF();
	void O_BACKANIMUPDATEON();
	void O_CHANGECURSOR();
	void O_CHANGEANIMTYPE();
	void O__SETFLAG();
	void O_COMPARE();
	void O_JUMPZ();
	void O_JUMPNZ();
	void O_EXIT();
	void O_ADDFLAG();
	void O_TALKANIM();
	void O_SUBFLAG();
	void O_SETSTRING();
	void O_ANDFLAG();
	void O_GETMOBDATA();
	void O_ORFLAG();
	void O_SETMOBDATA();
	void O_XORFLAG();
	void O_GETMOBTEXT();
	void O_MOVEHERO();
	void O_WALKHERO();
	void O_SETHERO();
	void O_HEROOFF();
	void O_HEROON();
	void O_CLSTEXT();
	void O_CALLTABLE();
	void O_CHANGEMOB();
	void O_ADDINV();
	void O_REMINV();
	void O_REPINV();
	void O_OBSOLETE_GETACTION();
	void O_ADDWALKAREA();
	void O_REMWALKAREA();
	void O_RESTOREWALKAREA();
	void O_WAITFRAME();
	void O_SETFRAME();
	void O_RUNACTION();
	void O_COMPAREHI();
	void O_COMPARELO();
	void O_PRELOADSET();
	void O_FREEPRELOAD();
	void O_CHECKINV();
	void O_TALKHERO();
	void O_WAITTEXT();
	void O_SETHEROANIM();
	void O_WAITHEROANIM();
	void O_GETHERODATA();
	void O_GETMOUSEBUTTON();
	void O_CHANGEFRAMES();
	void O_CHANGEBACKFRAMES();
	void O_GETBACKANIMDATA();
	void O_GETANIMDATA();
	void O_SETBGCODE();
	void O_SETBACKFRAME();
	void O_GETRND();
	void O_TALKBACKANIM();
	void O_LOADPATH();
	void O_GETCHAR();
	void O_SETDFLAG();
	void O_CALLDFLAG();
	void O_PRINTAT();
	void O_ZOOMIN();
	void O_ZOOMOUT();
	void O_SETSTRINGOFFSET();
	void O_GETOBJDATA();
	void O_SETOBJDATA();
	void O_SWAPOBJECTS();
	void O_CHANGEHEROSET();
	void O_ADDSTRING();
	void O_SUBSTRING();
	void O_INITDIALOG();
	void O_ENABLEDIALOGOPT();
	void O_DISABLEDIALOGOPT();
	void O_SHOWDIALOGBOX();
	void O_STOPSAMPLE();
	void O_BACKANIMRANGE();
	void O_CLEARPATH();
	void O_SETPATH();
	void O_GETHEROX();
	void O_GETHEROY();
	void O_GETHEROD();
	void O_PUSHSTRING();
	void O_POPSTRING();
	void O_SETFGCODE();
	void O_STOPHERO();
	void O_ANIMUPDATEOFF();
	void O_ANIMUPDATEON();
	void O_FREECURSOR();
	void O_ADDINVQUIET();
	void O_RUNHERO();
	void O_SETBACKANIMDATA();
	void O_VIEWFLC();
	void O_CHECKFLCFRAME();
	void O_CHECKFLCEND();
	void O_FREEFLC();
	void O_TALKHEROSTOP();
	void O_HEROCOLOR();
	void O_GRABMAPA();
	void O_ENABLENAK();
	void O_DISABLENAK();
	void O_GETMOBNAME();
	void O_SWAPINVENTORY();
	void O_CLEARINVENTORY();
	void O_SKIPTEXT();
	void O_SETVOICEH();
	void O_SETVOICEA();
	void O_SETVOICEB();
	void O_SETVOICEC();
	void O_VIEWFLCLOOP();
	void O_FLCSPEED();
	void O_OPENINVENTORY();
	void O_KRZYWA();
	void O_GETKRZYWA();
	void O_GETMOB();
	void O_INPUTLINE();
	void O_SETVOICED();
	void O_BREAK_POINT();

};

}

#endif

/* vim: set tabstop=4 noexpandtab: */