/* 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_SCRIPTOPCODES_H
#define DRAGONS_SCRIPTOPCODES_H

#include "common/func.h"
#include "common/str.h"


namespace Dragons {

#define DRAGONS_NUM_SCRIPT_OPCODES 0x23
class DragonsEngine;

struct ScriptOpCall {
	byte _op;
	byte *_base;
	byte *_code;
	byte *_codeEnd;
	int _field8;
	int _result;

	ScriptOpCall(byte *start, uint32 length);
	void skip(uint size);
	byte readByte();
	int16 readSint16();
	uint32 readUint32();
};

typedef Common::Functor1<ScriptOpCall&, void> ScriptOpcode;

class DragonFLG;
class SpecialOpcodes;

class ScriptOpcodes {
public:
	ScriptOpcodes(DragonsEngine *vm, DragonFLG *dragonFLG);
	~ScriptOpcodes();
	void runScript(ScriptOpCall &scriptOpCall);
	void runScript3(ScriptOpCall &scriptOpCall);
	bool runScript4(ScriptOpCall &scriptOpCall);
	void execOpcode(ScriptOpCall &scriptOpCall);
	void executeScriptLoop(ScriptOpCall &scriptOpCall);
	void loadTalkDialogEntries(ScriptOpCall &scriptOpCall);

	int16 _numDialogStackFramesToPop;
	int16 _scriptTargetINI;
	SpecialOpcodes *_specialOpCodes;

protected:
	DragonsEngine *_vm;
	DragonFLG *_dragonFLG;
	ScriptOpcode *_opcodes[DRAGONS_NUM_SCRIPT_OPCODES];
	Common::String _opcodeNames[DRAGONS_NUM_SCRIPT_OPCODES];

	void initOpcodes();
	void freeOpcodes();
	void updateReturn(ScriptOpCall &scriptOpCall, uint16 size);


	// Opcodes
	void opUnk1(ScriptOpCall &scriptOpCall);
	void opAddDialogChoice(ScriptOpCall &scriptOpCall);
	void opPopDialogStack(ScriptOpCall &scriptOpCall);
	void opExecuteScript(ScriptOpCall &scriptOpCall); //op 4
	void opSetActorDirection(ScriptOpCall &scriptOpCall); //op 5
	void opPerformActionOnObject(ScriptOpCall &scriptOpCall);
	void opMoveObjectToScene(ScriptOpCall &scriptOpCall);
	void opActorLoadSequence(ScriptOpCall &scriptOpCall);

	void opSetVariable(ScriptOpCall &scriptOpCall);
	void opRunSpecialOpCode(ScriptOpCall &scriptOpCall); //op B
	void opPlayOrStopSound(ScriptOpCall &scriptOpCall);
	void opDelay(ScriptOpCall &scriptOpCall); //op D
	void opMoveActorToPoint(ScriptOpCall &scriptOpCall);
	void opMoveActorToXY(ScriptOpCall &scriptOpCall);
	void opMoveActorToObject(ScriptOpCall &scriptOpCall);
	void opUnk11FlickerTalk(ScriptOpCall &scriptOpCall);
	void opLoadScene(ScriptOpCall &scriptOpCall);
	void opIfStatement(ScriptOpCall &scriptOpCall);
	void opIfElseStatement(ScriptOpCall &scriptOpCall);
	void opUnk15PropertiesRelated(ScriptOpCall &scriptOpCall);
	void opUnk16(ScriptOpCall &scriptOpCall);
	void opWaitForActorSequenceToFinish(ScriptOpCall &scriptOpCall);
	void opDialogAtPoint(ScriptOpCall &scriptOpCall);
	void opExecuteObjectSceneScript(ScriptOpCall &scriptOpCall);
	void opUpdatePaletteCycling(ScriptOpCall &scriptOpCall);
	void opWaitForActorToFinishWalking(ScriptOpCall &scriptOpCall);
	void opShowActor(ScriptOpCall &scriptOpCall);
	void opHideActor(ScriptOpCall &scriptOpCall);
	void opSetActorFlag0x1000(ScriptOpCall &scriptOpCall);
	void opPlayMusic(ScriptOpCall &scriptOpCall);
	void opPreLoadSceneData(ScriptOpCall &scriptOpCall);
	void opPauseCurrentSpeechAndFetchNextDialog(ScriptOpCall &scriptOpCall);

	bool evaluateExpression(ScriptOpCall &scriptOpCall);
	void setVariable(ScriptOpCall &scriptOpCall);
	void opCode_Unk7(ScriptOpCall &scriptOpCall);

	void opCodeActorTalk(ScriptOpCall &scriptOpCall); // 0x22

	// misc
	uint16 getINIField(uint32 iniIndex, uint16 fieldOffset);
	void setINIField(uint32 iniIndex, uint16 fieldOffset, uint16 value);
};

} // End of namespace Dragons

#endif // DRAGONS_SCRIPTOPCODES_H