/* 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: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-1-1-1/engines/tinsel/drives.cpp $
 * $Id: drives.cpp 45616 2009-11-02 21:54:57Z fingolfin $
 *
 * CD/drive handling functions
 */

#include "gui/message.h"
#include "tinsel/drives.h"
#include "tinsel/scene.h"
#include "tinsel/tinsel.h"
#include "tinsel/sched.h"
#include "tinsel/strres.h"

namespace Tinsel {

char currentCD = '1';
static uint32 cdFlags[] = { fCd1, fCd2, fCd3, fCd4, fCd5, fCd6, fCd7, fCd8 };

static bool bChangingCD = false;
static char nextCD = '\0';


void CdCD(CORO_PARAM) {
	CORO_BEGIN_CONTEXT;
	CORO_END_CONTEXT(_ctx);

	CORO_BEGIN_CODE(_ctx);

	while (bChangingCD) {
		if (g_scheduler->getCurrentProcess()) {
			// FIXME: CdCD gets passed a nullContext in RegisterGlobals() and
			//        PrimeSceneHopper(), because I didn't know how to get a proper
			//        context without converting the whole calling stack to CORO'd
			//        functions. If these functions really get called while a CD
			//        change is requested, this needs to be resolved.
			if (coroParam == nullContext)
				error("CdCD needs context");
			CORO_SLEEP(1);
		} else
			error("No current process in CdCD()");
	}

	CORO_END_CODE;
}

int GetCurrentCD() {
	// count from 1
	return (currentCD - '1' + 1);
}

void SetCD(int flags) {
	if (flags & cdFlags[currentCD - '1'])
		return;

	error("SetCD() problem");
}

int GetCD(int flags) {
	int i;
	char cd = '\0';

	if (flags & cdFlags[currentCD - '1'])
		return GetCurrentCD();

	for (i = 0; i < 8; i++) {
		if (flags & cdFlags[i]) {
			cd = (char)(i + '1');
			break;
		}
	}
	assert(i != 8);

	nextCD = cd;
	return cd;
}

static uint32 lastTime = 0;
extern LANGUAGE sampleLanguage;

void DoCdChange() {
	if (bChangingCD && (g_system->getMillis() > (lastTime + 1000))) {
		lastTime = g_system->getMillis();
		_vm->_sound->closeSampleStream();

		// Use the filesize of the sample file to determine, for Discworld 2, which CD it is
		if (TinselV2) {
			TinselFile f;
			if (!f.open(_vm->getSampleFile(sampleLanguage)))
				// No CD present
				return;

			char sampleCdNumber = (f.size() >= (200 * 1024 * 1024)) ? '1' : '2';

			f.close();

			if (currentCD != sampleCdNumber)
				return;
		}

		_vm->_sound->openSampleFiles();
		ChangeLanguage(TextLanguage());
		bChangingCD = false;
	}
}

void SetNextCD(int cdNumber) {
	assert(cdNumber == 1 || cdNumber == 2);

	nextCD = (char)(cdNumber + '1' - 1);
}

bool GotoCD() {
	// WORKAROUND: Somehow, CdDoChange() is called twice... Hopefully, this guard helps
	if (currentCD == nextCD)
		return false;

	currentCD = nextCD;

/*	if (bNoCD)	{
		strcpy(cdDirectory, hdDirectory);
		cdLastBit[3] = currentCD;
		strcat(cdDirectory, cdLastBit);
	}
*/
	bChangingCD = true;

	return true;
}

bool TinselFile::_warningShown = false;

bool TinselFile::open(const Common::String &filename) {
	if (Common::File::open(filename)) {
		// If it's the sample file, strip off the CD number from the filename


		return true;
	}

	if (!TinselV2)
		return false;

	// Check if the file being requested is the *1.* or *2.* files
	const char *fname = filename.c_str();
	const char *p = strchr(fname, '1');
	if (!p)
		p = strchr(fname, '2');
	if (!p || (*(p + 1) != '.'))
		return false;

	// Form a filename without the CD number character
	char newFilename[50];
	strncpy(newFilename, fname, p - fname);
	strcpy(newFilename + (p - fname), p + 1);

	return Common::File::open(newFilename);
}

} // End of namespace Tinsel
