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

#include "engines/engine.h"
#include "common/config-manager.h"
#include "common/str.h"
#include "common/system.h"
#include "common/util.h"
#include "sound/mididrv.h"
#include "sound/musicplugin.h"
#include "common/translation.h"

const byte MidiDriver::_mt32ToGm[128] = {
//	  0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F
	  0,   1,   0,   2,   4,   4,   5,   3,  16,  17,  18,  16,  16,  19,  20,  21, // 0x
	  6,   6,   6,   7,   7,   7,   8, 112,  62,  62,  63,  63,  38,  38,  39,  39, // 1x
	 88,  95,  52,  98,  97,  99,  14,  54, 102,  96,  53, 102,  81, 100,  14,  80, // 2x
	 48,  48,  49,  45,  41,  40,  42,  42,  43,  46,  45,  24,  25,  28,  27, 104, // 3x
	 32,  32,  34,  33,  36,  37,  35,  35,  79,  73,  72,  72,  74,  75,  64,  65, // 4x
	 66,  67,  71,  71,  68,  69,  70,  22,  56,  59,  57,  57,  60,  60,  58,  61, // 5x
	 61,  11,  11,  98,  14,   9,  14,  13,  12, 107, 107,  77,  78,  78,  76,  76, // 6x
	 47, 117, 127, 118, 118, 116, 115, 119, 115, 112,  55, 124, 123,   0,  14, 117  // 7x
};

const byte MidiDriver::_gmToMt32[128] = {
//	  0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F
	  5,   1,   2,   7,   3,   5,  16,  21,  22, 101, 101,  97, 104, 103, 102,  20, // 0x
	  8,   9,  11,  12,  14,  15,  87,  15,  59,  60,  61,  62,  67,  44,  79,  23, // 1x
	 64,  67,  66,  70,  68,  69,  28,  31,  52,  54,  55,  56,  49,  51,  57, 112, // 2x
	 48,  50,  45,  26,  34,  35,  45, 122,  89,  90,  94,  81,  92,  95,  24,  25, // 3x
	 80,  78,  79,  78,  84,  85,  86,  82,  74,  72,  76,  77, 110, 107, 108,  76, // 4x
	 47,  44, 111,  45,  44,  34,  44,  30,  32,  33,  88,  34,  35,  35,  38,  33, // 5x
	 41,  36, 100,  37,  40,  34,  43,  40,  63,  21,  99, 105, 103,  86,  55,  84, // 6x
	101, 103, 100, 120, 117, 113,  99, 128, 128, 128, 128, 124, 123, 128, 128, 128, // 7x
};

static const uint32 GUIOMapping[] = {
	MT_PCSPK,		Common::GUIO_MIDIPCSPK,
	/*MDT_CMS,		Common::GUIO_MIDICMS,*/
	MT_PCJR,		Common::GUIO_MIDIPCJR,
	MT_ADLIB,		Common::GUIO_MIDIADLIB,
	MT_TOWNS,		Common::GUIO_MIDITOWNS,
	MT_GM,			Common::GUIO_MIDIGM,
	MT_MT32,		Common::GUIO_MIDIMT32,
	0,		0
};

uint32 MidiDriver::musicType2GUIO(uint32 musicType) {
	uint32 res = 0;

	for (int i = 0; GUIOMapping[i] || GUIOMapping[i + 1]; i += 2) {
		if (musicType == GUIOMapping[i] || musicType == (uint32)-1)
			res |= GUIOMapping[i + 1];
	}

	return res;
}

bool MidiDriver::_forceTypeMT32 = false;

MusicType MidiDriver::getMusicType(MidiDriver::DeviceHandle handle) {
	if (_forceTypeMT32)
		return MT_MT32;

	if (handle) {
		const MusicPlugin::List p = MusicMan.getPlugins();
		for (MusicPlugin::List::const_iterator m = p.begin(); m != p.end(); m++) {
			MusicDevices i = (**m)->getDevices();
			for (MusicDevices::iterator d = i.begin(); d != i.end(); d++) {
				if (handle == d->getHandle())
					return d->getMusicType();
			}
		}
	}
	
	return MT_INVALID;
}

Common::String MidiDriver::getDeviceString(DeviceHandle handle, DeviceStringType type) {
	if (handle) {
		const MusicPlugin::List p = MusicMan.getPlugins();
		for (MusicPlugin::List::const_iterator m = p.begin(); m != p.end(); m++) {
			MusicDevices i = (**m)->getDevices();
			for (MusicDevices::iterator d = i.begin(); d != i.end(); d++) {
				if (handle == d->getHandle()) {
					if (type == kDriverName)
						return d->getMusicDriverName();
					else if (type == kDriverId)
						return d->getMusicDriverId();
					else if (type == kDeviceId)
						return d->getCompleteId();
					else
						return Common::String("auto");
				}
			}
		}
	}

	return Common::String("auto");
}

MidiDriver::DeviceHandle MidiDriver::detectDevice(int flags) {
	// Query the selected music device (defaults to MT_AUTO device).
	DeviceHandle hdl = getDeviceHandle(ConfMan.get("music_driver"));

	_forceTypeMT32 = false;

	// Check whether the selected music driver is compatible with the
	// given flags.
	switch (getMusicType(hdl)) {
	case MT_PCSPK:
		if (flags & MDT_PCSPK)
			return hdl;
		break;

	case MT_PCJR:
		if (flags & MDT_PCJR)
			return hdl;
		break;
	
	case MT_CMS:
		if (flags & MDT_CMS)
			return hdl;
		break;

	case MT_ADLIB:
		if (flags & MDT_ADLIB)
			return hdl;
		break;
		
	case MT_TOWNS:
		if (flags & MDT_TOWNS)
			return hdl;
		break;

	case MT_PC98:
		if (flags & MDT_PC98)
			return hdl;
		break;

	case MT_GM:
	case MT_GS:
	case MT_MT32:
		if (flags & MDT_MIDI)
			return hdl;
		break;

	case MT_NULL:
		return hdl;

	default:
		break;
	}

	// If the selected driver did not match the flags setting,
	// we try to determine a suitable and "optimal" music driver.
	const MusicPlugin::List p = MusicMan.getPlugins();
	// If only MDT_MIDI but not MDT_PREFER_MT32 or MDT_PREFER_GM is set we prefer the other devices (which will always be
	// detected since they are hard coded and cannot be disabled.
	for (int l = (flags & (MDT_PREFER_GM | MDT_PREFER_MT32)) ? 1 : 0; l < 2; ++l) {
		if ((flags & MDT_MIDI) && (l == 1)) {
			// If a preferred MT32 or GM device has been selected that device gets returned
			if (flags & MDT_PREFER_MT32)
				hdl = getDeviceHandle(ConfMan.get("mt32_device"));
			else if (flags & MDT_PREFER_GM)
				hdl = getDeviceHandle(ConfMan.get("gm_device"));
			else
				hdl = getDeviceHandle("auto");

			const MusicType type = getMusicType(hdl);
			if (type != MT_AUTO && type != MT_INVALID) {
				if (flags & MDT_PREFER_MT32)
					// If we have a preferred MT32 device we disable the gm/mt32 mapping (more about this in mididrv.h)
					_forceTypeMT32 = true;

				return hdl;
			}

			// If we have no specific device selected (neither in the scummvm nor in the game domain)
			// and no preferred MT32 or GM device selected we arrive here.
			// If MT32 is preferred we try for the first available device with music type 'MT_MT32' (usually the mt32 emulator)
			if (flags & MDT_PREFER_MT32) {
				for (MusicPlugin::List::const_iterator m = p.begin(); m != p.end(); ++m) {
					MusicDevices i = (**m)->getDevices();
					for (MusicDevices::iterator d = i.begin(); d != i.end(); ++d) {
						if (d->getMusicType() == MT_MT32)
							return d->getHandle();
					}
				}
			}

			// Now we default to the first available device with music type 'MT_GM'
			for (MusicPlugin::List::const_iterator m = p.begin(); m != p.end(); ++m) {
				MusicDevices i = (**m)->getDevices();
				for (MusicDevices::iterator d = i.begin(); d != i.end(); ++d) {
					if (d->getMusicType() == MT_GM || d->getMusicType() == MT_GS)
						return d->getHandle();
				}
			}
		}

		MusicType tp = MT_AUTO;
		if (flags & MDT_TOWNS)
			tp = MT_TOWNS;
		else if (flags & MDT_ADLIB)
			tp = MT_ADLIB;
		else if (flags & MDT_PCSPK)
			tp = MT_PCSPK;
		else
			tp = MT_AUTO;

		for (MusicPlugin::List::const_iterator m = p.begin(); m != p.end(); ++m) {
			MusicDevices i = (**m)->getDevices();
			for (MusicDevices::iterator d = i.begin(); d != i.end(); ++d) {
				if (d->getMusicType() == tp)
					return d->getHandle();
			}
		}
	}

	return 0;
}

MidiDriver *MidiDriver::createMidi(MidiDriver::DeviceHandle handle) {
	MidiDriver *driver = 0;
	const MusicPlugin::List p = MusicMan.getPlugins();
	for (MusicPlugin::List::const_iterator m = p.begin(); m != p.end(); m++) {
		if (getDeviceString(handle, MidiDriver::kDriverId).equals((**m)->getId()))
			(**m)->createInstance(&driver, handle);
	}

	return driver;
}

MidiDriver::DeviceHandle MidiDriver::getDeviceHandle(const Common::String &identifier) {
	const MusicPlugin::List p = MusicMan.getPlugins();

	if (p.begin() == p.end())
		error("Music plugins must be loaded prior to calling this method.");

	for (MusicPlugin::List::const_iterator m = p.begin(); m != p.end(); m++) {
		MusicDevices i = (**m)->getDevices();
		for (MusicDevices::iterator d = i.begin(); d != i.end(); d++) {
			if (identifier.equals(d->getCompleteId()) || identifier.equals(d->getCompleteName())) {
				return d->getHandle();
			}
		}
	}

	return 0;
}