/* 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.
 *
 * $URL$
 * $Id$
 *
 */

#ifndef PARALLACTION_PARSER_H
#define PARALLACTION_PARSER_H

#include "common/stream.h"
#include "parallaction/objects.h"
#include "parallaction/walk.h"

namespace Parallaction {

char   *parseNextToken(char *s, char *tok, uint16 count, const char *brk, bool ignoreQuotes = false);

#define MAX_TOKEN_LEN	50
extern int  _numTokens;
extern char _tokens[][MAX_TOKEN_LEN];

class Script {

	Common::ReadStream *_input;
	bool	_disposeSource;
	uint	_line;				// for debug messages

	void clearTokens();
	uint16 fillTokens(char* line);

public:
	Script(Common::ReadStream *, bool _disposeSource = false);
	~Script();

	char *readLine(char *buf, size_t bufSize);
	uint16 readLineToken(bool errorOnEOF = false);

	void skip(const char* endToken);

	uint	getLine() { return _line; }
};


typedef Common::Functor0<void> Opcode;
typedef Common::Array<const Opcode*>	OpcodeSet;



class Parser {

public:
	Parser() { reset(); }
	~Parser() {}

	uint	_lookup;

	Common::Stack<OpcodeSet*>	_opcodes;
	Common::Stack<Table*>		_statements;

	OpcodeSet	*_currentOpcodes;
	Table		*_currentStatements;

	void	reset();
	void	pushTables(OpcodeSet *opcodes, Table* statements);
	void	popTables();
	void	parseStatement();

};

#define DECLARE_UNQUALIFIED_ZONE_PARSER(sig) void locZoneParse_##sig()
#define DECLARE_UNQUALIFIED_ANIM_PARSER(sig) void locAnimParse_##sig()
#define DECLARE_UNQUALIFIED_COMMAND_PARSER(sig) void cmdParse_##sig()
#define DECLARE_UNQUALIFIED_LOCATION_PARSER(sig) void locParse_##sig()
#define DECLARE_UNQUALIFIED_INSTRUCTION_PARSER(sig) void instParse_##sig()

#define MAX_FORWARDS	50

class Parallaction_ns;
class Parallaction_br;


class LocationParser_ns {

protected:
	Parallaction_ns*	_vm;
	Script	*_script;
	Parser	*_parser;

	Table		*_zoneTypeNames;
	Table		*_zoneFlagNames;

	// location parser
	OpcodeSet	_locationParsers;
	OpcodeSet	_locationZoneParsers;
	OpcodeSet	_locationAnimParsers;
	OpcodeSet	_commandParsers;
	Table		*_commandsNames;
	Table		*_locationStmt;
	Table		*_locationZoneStmt;
	Table		*_locationAnimStmt;

	struct ParserContext {
		bool		end;

		const char	*filename;
		ZonePtr		z;
		AnimationPtr	a;
		int			nextToken;
		CommandList *list;
		bool		endcommands;
		CommandPtr	cmd;

		// BRA specific
		int numZones;
		BackgroundInfo	*info;
		char *bgName;
		char *maskName;
		char *pathName;
		char *characterName;
	} ctxt;

	void warning_unexpected();

	DECLARE_UNQUALIFIED_LOCATION_PARSER(endlocation);
	DECLARE_UNQUALIFIED_LOCATION_PARSER(location);
	DECLARE_UNQUALIFIED_LOCATION_PARSER(disk);
	DECLARE_UNQUALIFIED_LOCATION_PARSER(nodes);
	DECLARE_UNQUALIFIED_LOCATION_PARSER(zone);
	DECLARE_UNQUALIFIED_LOCATION_PARSER(animation);
	DECLARE_UNQUALIFIED_LOCATION_PARSER(localflags);
	DECLARE_UNQUALIFIED_LOCATION_PARSER(commands);
	DECLARE_UNQUALIFIED_LOCATION_PARSER(acommands);
	DECLARE_UNQUALIFIED_LOCATION_PARSER(flags);
	DECLARE_UNQUALIFIED_LOCATION_PARSER(comment);
	DECLARE_UNQUALIFIED_LOCATION_PARSER(endcomment);
	DECLARE_UNQUALIFIED_LOCATION_PARSER(sound);
	DECLARE_UNQUALIFIED_LOCATION_PARSER(music);
	DECLARE_UNQUALIFIED_ZONE_PARSER(limits);
	DECLARE_UNQUALIFIED_ZONE_PARSER(moveto);
	DECLARE_UNQUALIFIED_ZONE_PARSER(type);
	DECLARE_UNQUALIFIED_ZONE_PARSER(commands);
	DECLARE_UNQUALIFIED_ZONE_PARSER(label);
	DECLARE_UNQUALIFIED_ZONE_PARSER(flags);
	DECLARE_UNQUALIFIED_ZONE_PARSER(endzone);
	DECLARE_UNQUALIFIED_ZONE_PARSER(null);
	DECLARE_UNQUALIFIED_ANIM_PARSER(script);
	DECLARE_UNQUALIFIED_ANIM_PARSER(commands);
	DECLARE_UNQUALIFIED_ANIM_PARSER(type);
	DECLARE_UNQUALIFIED_ANIM_PARSER(label);
	DECLARE_UNQUALIFIED_ANIM_PARSER(flags);
	DECLARE_UNQUALIFIED_ANIM_PARSER(file);
	DECLARE_UNQUALIFIED_ANIM_PARSER(position);
	DECLARE_UNQUALIFIED_ANIM_PARSER(moveto);
	DECLARE_UNQUALIFIED_ANIM_PARSER(endanimation);
	DECLARE_UNQUALIFIED_COMMAND_PARSER(flags);
	DECLARE_UNQUALIFIED_COMMAND_PARSER(animation);
	DECLARE_UNQUALIFIED_COMMAND_PARSER(zone);
	DECLARE_UNQUALIFIED_COMMAND_PARSER(location);
	DECLARE_UNQUALIFIED_COMMAND_PARSER(invObject);
	DECLARE_UNQUALIFIED_COMMAND_PARSER(call);
	DECLARE_UNQUALIFIED_COMMAND_PARSER(simple);
	DECLARE_UNQUALIFIED_COMMAND_PARSER(move);
	DECLARE_UNQUALIFIED_COMMAND_PARSER(endcommands);

	virtual void parseGetData(ZonePtr z);
	virtual void parseExamineData(ZonePtr z);
	virtual void parseDoorData(ZonePtr z);
	virtual void parseMergeData(ZonePtr z);
	virtual void parseHearData(ZonePtr z);
	virtual void parseSpeakData(ZonePtr z);

	char		*parseComment();
	char		*parseDialogueString();
	Dialogue	*parseDialogue();
	void		resolveDialogueForwards(Dialogue *dialogue, uint numQuestions, Table &forwards);
	Answer		*parseAnswer();
	Question	*parseQuestion();

	void		parseZone(ZoneList &list, char *name);
	virtual void parseZoneTypeBlock(ZonePtr z);
	void		parsePointList(PointList &list);
	void		parseAnimation(AnimationList &list, char *name);
	void		parseCommands(CommandList&);
	void		parseCommandFlags();
	void 		saveCommandForward(const char *name, CommandPtr cmd);
	void 		resolveCommandForwards();
	void		createCommand(uint id);
	void		addCommand();

	struct CommandForwardReference {
		char		name[20];
		CommandPtr	cmd;
	} _forwardedCommands[MAX_FORWARDS];
	uint		_numForwardedCommands;

	void clearSet(OpcodeSet &opcodes) {
		for (Common::Array<const Opcode*>::iterator i = opcodes.begin(); i != opcodes.end(); ++i)
			delete *i;
		opcodes.clear();
	}

public:
	LocationParser_ns(Parallaction_ns *vm) : _vm(vm) {
	}

	virtual void init();

	virtual ~LocationParser_ns() {
		delete _parser;
		delete _commandsNames;
		delete _locationStmt;
		delete _locationZoneStmt;
		delete _locationAnimStmt;
		delete _zoneTypeNames;
		delete _zoneFlagNames;

		clearSet(_commandParsers);
		clearSet(_locationAnimParsers);
		clearSet(_locationZoneParsers);
		clearSet(_locationParsers);
	}

	void parse(Script *script);

};

/*
	TODO: adapt the parser to effectively use the
	statement list provided by preprocessor as its
	input, instead of relying on the current Script
	class.

	This would need a major rewrite of the parsing
	system!

	parseNextToken could then be sealed into the
	PreProcessor class forever, together with the
	_tokens[] and _numTokens stuff, now dangling as
	global objects.

	NS balloons code should be dealt with before,
	though.
*/
class LocationParser_br : public LocationParser_ns {

protected:
	Table		*_audioCommandsNames;

	Parallaction_br*	_vm;

	DECLARE_UNQUALIFIED_LOCATION_PARSER(location);
	DECLARE_UNQUALIFIED_LOCATION_PARSER(zone);
	DECLARE_UNQUALIFIED_LOCATION_PARSER(animation);
	DECLARE_UNQUALIFIED_LOCATION_PARSER(localflags);
	DECLARE_UNQUALIFIED_LOCATION_PARSER(flags);
	DECLARE_UNQUALIFIED_LOCATION_PARSER(comment);
	DECLARE_UNQUALIFIED_LOCATION_PARSER(endcomment);
	DECLARE_UNQUALIFIED_LOCATION_PARSER(sound);
	DECLARE_UNQUALIFIED_LOCATION_PARSER(music);
	DECLARE_UNQUALIFIED_LOCATION_PARSER(redundant);
	DECLARE_UNQUALIFIED_LOCATION_PARSER(ifchar);
	DECLARE_UNQUALIFIED_LOCATION_PARSER(character);
	DECLARE_UNQUALIFIED_LOCATION_PARSER(mask);
	DECLARE_UNQUALIFIED_LOCATION_PARSER(path);
	DECLARE_UNQUALIFIED_LOCATION_PARSER(escape);
	DECLARE_UNQUALIFIED_LOCATION_PARSER(zeta);
	DECLARE_UNQUALIFIED_LOCATION_PARSER(null);
	DECLARE_UNQUALIFIED_COMMAND_PARSER(ifchar);
	DECLARE_UNQUALIFIED_COMMAND_PARSER(endif);
	DECLARE_UNQUALIFIED_COMMAND_PARSER(location);
	DECLARE_UNQUALIFIED_COMMAND_PARSER(toggle);
	DECLARE_UNQUALIFIED_COMMAND_PARSER(string);
	DECLARE_UNQUALIFIED_COMMAND_PARSER(math);
	DECLARE_UNQUALIFIED_COMMAND_PARSER(test);
	DECLARE_UNQUALIFIED_COMMAND_PARSER(music);
	DECLARE_UNQUALIFIED_COMMAND_PARSER(zeta);
	DECLARE_UNQUALIFIED_COMMAND_PARSER(swap);
	DECLARE_UNQUALIFIED_COMMAND_PARSER(give);
	DECLARE_UNQUALIFIED_COMMAND_PARSER(text);
	DECLARE_UNQUALIFIED_COMMAND_PARSER(unary);
	DECLARE_UNQUALIFIED_ZONE_PARSER(limits);
	DECLARE_UNQUALIFIED_ZONE_PARSER(moveto);
	DECLARE_UNQUALIFIED_ZONE_PARSER(type);
	DECLARE_UNQUALIFIED_ANIM_PARSER(file);
	DECLARE_UNQUALIFIED_ANIM_PARSER(position);
	DECLARE_UNQUALIFIED_ANIM_PARSER(moveto);
	DECLARE_UNQUALIFIED_ANIM_PARSER(endanimation);

	virtual void	parseZoneTypeBlock(ZonePtr z);
	void			parsePathData(ZonePtr z);

public:
	LocationParser_br(Parallaction_br *vm) : LocationParser_ns((Parallaction_ns*)vm), _vm(vm) {
	}

	virtual void init();

	virtual ~LocationParser_br() {
		delete _commandsNames;
		delete _locationStmt;
	}

	void parse(Script *script);

};



class ProgramParser_ns {

protected:
	Parser	*_parser;
	Parallaction_ns *_vm;


	Script	*_script;
	ProgramPtr	_program;

	// program parser
	OpcodeSet	_instructionParsers;
	Table		*_instructionNames;

	struct ParserContext {
		bool		end;
		AnimationPtr	a;
		InstructionPtr inst;
		LocalVariable *locals;

		// BRA specific
		InstructionPtr openIf;
	} ctxt;

	DECLARE_UNQUALIFIED_INSTRUCTION_PARSER(defLocal);
	DECLARE_UNQUALIFIED_INSTRUCTION_PARSER(animation);
	DECLARE_UNQUALIFIED_INSTRUCTION_PARSER(loop);
	DECLARE_UNQUALIFIED_INSTRUCTION_PARSER(x);
	DECLARE_UNQUALIFIED_INSTRUCTION_PARSER(y);
	DECLARE_UNQUALIFIED_INSTRUCTION_PARSER(z);
	DECLARE_UNQUALIFIED_INSTRUCTION_PARSER(f);
	DECLARE_UNQUALIFIED_INSTRUCTION_PARSER(inc);
	DECLARE_UNQUALIFIED_INSTRUCTION_PARSER(set);
	DECLARE_UNQUALIFIED_INSTRUCTION_PARSER(move);
	DECLARE_UNQUALIFIED_INSTRUCTION_PARSER(put);
	DECLARE_UNQUALIFIED_INSTRUCTION_PARSER(call);
	DECLARE_UNQUALIFIED_INSTRUCTION_PARSER(sound);
	DECLARE_UNQUALIFIED_INSTRUCTION_PARSER(null);
	DECLARE_UNQUALIFIED_INSTRUCTION_PARSER(endscript);

	void		parseInstruction();
	void		parseLValue(ScriptVar &var, const char *str);
	virtual void	parseRValue(ScriptVar &var, const char *str);

	void clearSet(OpcodeSet &opcodes) {
		for (Common::Array<const Opcode*>::iterator i = opcodes.begin(); i != opcodes.end(); ++i)
			delete *i;
		opcodes.clear();
	}

public:
	ProgramParser_ns(Parallaction_ns *vm) : _vm(vm) {
	}

	virtual void init();

	virtual ~ProgramParser_ns() {
		delete _parser;
		delete _instructionNames;

		clearSet(_instructionParsers);
	}

	void parse(Script *script, ProgramPtr program);

};


class ProgramParser_br : public ProgramParser_ns {

protected:
	Parallaction_br *_vm;

	DECLARE_UNQUALIFIED_INSTRUCTION_PARSER(zone);
	DECLARE_UNQUALIFIED_INSTRUCTION_PARSER(color);
	DECLARE_UNQUALIFIED_INSTRUCTION_PARSER(mask);
	DECLARE_UNQUALIFIED_INSTRUCTION_PARSER(print);
	DECLARE_UNQUALIFIED_INSTRUCTION_PARSER(text);
	DECLARE_UNQUALIFIED_INSTRUCTION_PARSER(if_op);
	DECLARE_UNQUALIFIED_INSTRUCTION_PARSER(endif);

	virtual void parseRValue(ScriptVar &var, const char *str);

public:
	ProgramParser_br(Parallaction_br *vm) : ProgramParser_ns((Parallaction_ns*)vm), _vm(vm) {
	}

	virtual void init();

	virtual ~ProgramParser_br() {
		delete _instructionNames;
		delete _parser;

	}

};


/*
	This simple stream is temporarily needed to hook the
	preprocessor output to the parser. It will go away
	when the parser is rewritten to fully exploit the
	statement list provided by the preprocessor.
*/

class ReadStringStream : public Common::ReadStream {

	char *_text;
	uint32	_pos;
	uint32	_size;

public:
	ReadStringStream(const Common::String &text) {
		_text = new char[text.size() + 1];
		strcpy(_text, text.c_str());
		_size = text.size();
		_pos = 0;
	}

	~ReadStringStream() {
		delete []_text;
	}

	uint32 read(void *buffer, uint32 size) {
		if (_pos + size > _size) {
			size = _size - _pos;
		}
		memcpy(buffer, _text + _pos, size);
		_pos += size;
		return size;
	}

	bool eos() const {
		return _pos == _size;
	}

};


/*
	Demented as it may sound, the success of a parsing operation in the
	original BRA depends on what has been parsed before. The game features
	an innovative chaos system that involves the parser and the very game
	engine, in order to inflict the user an unforgettable game experience.

	Ok, now for the serious stuff.

	The PreProcessor implemented here fixes the location scripts before
	they are fed to the parser. It tries to do so by a preliminary scan
	of the text file, during which a score is assigned to each statement
	(more on this later). When the whole file has been analyzed, the
	statements are sorted according to their score, to create a parsable
	sequence.

	For parsing, the statements in location scripts can be conveniently
	divided into 3 groups:

	* location definitions
	* element definitions
	* start-up commands

	Since the parsing of element definitions requires location parameters
	to be set, location definitions should be encountered first in the
	script. Start-up commands in turn may reference elements, so they can
	be parsed last. The first goal is to make sure the parser gets these
	three sets in this order.

	Location definitions must also be presented in a certain sequence,
	because resource files are not fully self-describing. In short, some
	critical game data in contained in certain files, that must obviously
	be read before any other can be analyzed. This is the second goal.

	TODO: some words about actual implementation.
*/

class StatementDef;

struct StatementListNode {
	int	_score;
	Common::String	_name;
	Common::String	_text;

	StatementListNode(int score, const Common::String &name, const Common::String &text) : _score(score), _name(name), _text(text) { }

	bool operator<(const StatementListNode& node) const {
		return _score < node._score;
	}
};
typedef Common::List<StatementListNode> StatementList;


class PreProcessor {
	typedef Common::List<StatementDef*> DefList;

	int _numZones;
	DefList _defs;

	StatementDef* findDef(const char* name);
	uint getDefScore(StatementDef*);

public:
	PreProcessor();
	~PreProcessor();
	void preprocessScript(Script &script, StatementList &list);
};



} // namespace Parallaction

#endif