/* 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/>.
 *
 */

#include "common/endian.h"

#include "gob/gob.h"
#include "gob/demos/scnplayer.h"
#include "gob/global.h"
#include "gob/util.h"
#include "gob/draw.h"
#include "gob/inter.h"
#include "gob/videoplayer.h"

namespace Gob {

SCNPlayer::SCNPlayer(GobEngine *vm) : DemoPlayer(vm) {
}

SCNPlayer::~SCNPlayer() {
}

bool SCNPlayer::playStream(Common::SeekableReadStream &scn) {
	// Read labels
	LabelMap labels;
	if (!readLabels(scn, labels))
		return false;

	// Iterate over all lines
	while (!scn.err() && !scn.eos()) {
		Common::String line = scn.readLine();

		// Interpret
		if (line == "CLEAR") {
			clearScreen();
		} else if (lineStartsWith(line, "VIDEO:")) {
			evaluateVideoMode(line.c_str() + 6);
		} else if (lineStartsWith(line, "IMD_PRELOAD ")) {
			playVideo(line.c_str() + 12);
		} else if (lineStartsWith(line, "IMD ")) {
			playVideo(line.c_str() + 4);
		} else if (lineStartsWith(line, "GOTO ")) {
			gotoLabel(scn, labels, line.c_str() + 5);
		} else if (lineStartsWith(line, "REBASE0:ON")) {
			_rebase0 = true;
		} else if (lineStartsWith(line, "REBASE0:OFF")) {
			_rebase0 = false;
		} else if (lineStartsWith(line, "ADL ")) {
			playADL(line.c_str() + 4);
		}

		// Mind user input
		_vm->_util->processInput();
		if (_vm->shouldQuit())
			return true;
	}

	if (scn.err())
		return false;

	return true;
}

bool SCNPlayer::readLabels(Common::SeekableReadStream &scn, LabelMap &labels) {
	debugC(1, kDebugDemo, "Reading SCN labels");

	int32 startPos = scn.pos();

	// Iterate over all lines
	while (!scn.err() && !scn.eos()) {
		Common::String line = scn.readLine();

		if (lineStartsWith(line, "LABEL ")) {
			// Label => Add to the hashmap
			labels.setVal(line.c_str() + 6, scn.pos());
			debugC(2, kDebugDemo, "Found label \"%s\" (%d)", line.c_str() + 6, (int)scn.pos());
		}
	}

	if (scn.err())
		return false;

	// Seek back
	if (!scn.seek(startPos))
		return false;

	return true;
}

void SCNPlayer::gotoLabel(Common::SeekableReadStream &scn,
		const LabelMap &labels, const char *label) {

	debugC(2, kDebugDemo, "Jumping to label \"%s\"", label);

	if (!labels.contains(label))
		return;

	scn.seek(labels.getVal(label));
}

} // End of namespace Gob
