/* ScummVM - Scumm Interpreter
 * Copyright (C) 2001  Ludvig Strigeus
 * Copyright (C) 2001-2005 The ScummVM project
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * $Header$
 *
 */

#include "common/stdafx.h"
#include "scumm/scumm.h"
#include "scumm/intern.h"
#include "scumm/resource.h"
#include "scumm/util.h"

namespace Scumm {

void ScummEngine_v4::readIndexFile() {
	uint16 blocktype;
	uint32 itemsize;
	int numblock = 0;

	debug(9, "readIndexFile()");

	closeRoom();
	openRoom(0);

	while (!_fileHandle->eof()) {
		// Figure out the sizes of various resources
		itemsize = _fileHandle->readUint32LE();
		blocktype = _fileHandle->readUint16LE();
		if (_fileHandle->ioFailed())
			break;

		switch (blocktype) {
		case 0x4E52:	// 'NR'
			_fileHandle->readUint16LE();
			break;
		case 0x5230:	// 'R0'
			_numRooms = _fileHandle->readUint16LE();
			break;
		case 0x5330:	// 'S0'
			_numScripts = _fileHandle->readUint16LE();
			break;
		case 0x4E30:	// 'N0'
			_numSounds = _fileHandle->readUint16LE();
			break;
		case 0x4330:	// 'C0'
			_numCostumes = _fileHandle->readUint16LE();
			break;
		case 0x4F30:	// 'O0'
			_numGlobalObjects = _fileHandle->readUint16LE();
			break;
		}
		_fileHandle->seek(itemsize - 8, SEEK_CUR);
	}

	_fileHandle->clearIOFailed();
	_fileHandle->seek(0, SEEK_SET);

	readMAXS(0);
	allocateArrays();

	while (1) {
		itemsize = _fileHandle->readUint32LE();

		if (_fileHandle->ioFailed())
			break;

		blocktype = _fileHandle->readUint16LE();

		numblock++;

		switch (blocktype) {

		case 0x4E52:	// 'NR'
			// Names of rooms. Maybe we should put them into a table, for use by the debugger?
			for (int room; (room = _fileHandle->readByte()); ) {
				char buf[10];
				_fileHandle->read(buf, 9);
				buf[9] = 0;
				for (int i = 0; i < 9; i++)
					buf[i] ^= 0xFF;
				debug(5, "Room %d: '%s'\n", room, buf);
			}
			break;

		case 0x5230:	// 'R0'
			readResTypeList(rtRoom, MKID('ROOM'), "room");
			break;

		case 0x5330:	// 'S0'
			readResTypeList(rtScript, MKID('SCRP'), "script");
			break;

		case 0x4E30:	// 'N0'
			readResTypeList(rtSound, MKID('SOUN'), "sound");
			break;

		case 0x4330:	// 'C0'
			readResTypeList(rtCostume, MKID('COST'), "costume");
			break;

		case 0x4F30:	// 'O0'
			readGlobalObjects();
			break;

		default:
			// FIXME: this is a little hack because Indy3 FM-TOWNS has
			// 32 extra bytes of unknown meaning appended to 00.LFL
			if (!(_gameId == GID_INDY3 && _platform == Common::kPlatformFMTowns))
				error("Bad ID %c%c found in directory!", blocktype & 0xFF, blocktype >> 8);
			return;
		}
	}
	closeRoom();
}

void ScummEngine_v4::loadCharset(int no) {
	uint32 size;
	memset(_charsetData, 0, sizeof(_charsetData));

	checkRange(4, 0, no, "Loading illegal charset %d");
	closeRoom();

	Common::File file;
	char buf[20];

	sprintf(buf, "%03d.LFL", 900 + no);
	file.open(buf);

	if (file.isOpen() == false) {
		error("loadCharset(%d): Missing file charset: %s", no, buf);
	}

	size = file.readUint32LE() + 11;
	file.read(res.createResource(rtCharset, no, size), size);
}

void ScummEngine_v4::readMAXS(int blockSize) {
	// FIXME - I'm not sure for those values yet, they will have to be rechecked

	_numVariables = 800;				// 800
	_numBitVariables = 4096;			// 2048
	_numLocalObjects = 200;				// 200
	_numArray = 50;
	_numVerbs = 100;
	_numNewNames = 50;
	_objectRoomTable = NULL;
	_numCharsets = 9;					// 9
	_numInventory = 80;					// 80
	_numGlobalScripts = 200;
	_numFlObject = 50;

	_shadowPaletteSize = 256;

	_shadowPalette = (byte *) calloc(_shadowPaletteSize, 1);	// FIXME - needs to be removed later
}

void ScummEngine_v4::readGlobalObjects() {
	int i;
	int num = _fileHandle->readUint16LE();
	assert(num == _numGlobalObjects);

	uint32 bits;
	byte tmp;
	for (i = 0; i != num; i++) {
		bits = _fileHandle->readByte();
		bits |= _fileHandle->readByte() << 8;
		bits |= _fileHandle->readByte() << 16;
		_classData[i] = bits;
		tmp = _fileHandle->readByte();
		_objectOwnerTable[i] = tmp & OF_OWNER_MASK;
		_objectStateTable[i] = tmp >> OF_STATE_SHL;
	}
}


} // End of namespace Scumm