/* 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.
 *
 */

#include "common/algorithm.h"
#include "common/config-manager.h"
#include "common/mutex.h"
#include "sherlock/sherlock.h"
#include "sherlock/music.h"
#include "sherlock/scalpel/drivers/mididriver.h"
// for Miles Audio (Sherlock Holmes 2)
#include "audio/miles.h"
// for 3DO digital music
#include "audio/decoders/aiff.h"

namespace Sherlock {

#define NUM_SONGS 45

/* This tells which song to play in each room, 0 = no song played */
static const char ROOM_SONG[62] = {
	 0, 20, 43,  6, 11,  2,  8, 15,  6, 28,
	 6, 38,  7, 32, 16,  5,  8, 41,  9, 22,
	10, 23,  4, 39, 19, 24, 13, 27,  0, 30,
	 3, 21, 26, 25, 16, 29,  1,  1, 18, 12,
	 1, 17, 17, 31, 17, 34, 36,  7, 20, 20,
	33,  8, 44, 40, 42, 35,  0,  0,  0, 12,
	12
};

static const char *const SONG_NAMES[NUM_SONGS] = {
	"SINGERF",  "CHEMIST",  "TOBAC",   "EQUEST",  "MORTUARY", "DOCKS",    "LSTUDY",
	"LORD",     "BOY",      "PERFUM1", "BAKER1",  "BAKER2",   "OPERA1",   "HOLMES",
	"FFLAT",    "OP1FLAT",  "ZOO",     "SROOM",   "FLOWERS",  "YARD",     "TAXID",
	"PUB1",     "VICTIM",   "RUGBY",   "DORM",    "SHERMAN",  "LAWYER",   "THEATRE",
	"DETECT",   "OPERA4",   "POOL",    "SOOTH",   "ANNA1",    "ANNA2",    "PROLOG3",
	"PAWNSHOP", "MUSICBOX", "MOZART1", "ROBHUNT", "PANCRAS1", "PANCRAS2", "LORDKILL",
	"BLACKWEL", "RESCUE",   "MAP"
};

MidiParser_SH::MidiParser_SH() {
	_ppqn = 1;
	setTempo(16667);
	_data = nullptr;
	_beats = 0;
	_lastEvent = 0;
	_trackEnd = nullptr;

	_musData     = nullptr;
	_musDataSize = 0;
}

MidiParser_SH::~MidiParser_SH() {
	Common::StackLock lock(_mutex);
	unloadMusic();
	_driver = NULL;
}

void MidiParser_SH::parseNextEvent(EventInfo &info) {
	Common::StackLock lock(_mutex);

//	warning("parseNextEvent");

	// there is no delta right at the start of the music data
	// this order is essential, otherwise notes will get delayed or even go missing
	if (_position._playPos != _tracks[0]) {
		info.delta = *(_position._playPos++);
	} else {
		info.delta = 0;
	}

	info.start = _position._playPos;

	info.event = *_position._playPos++;
	//warning("Event %x", info.event);
	_position._runningStatus = info.event;

	switch (info.command()) {
	case 0xC: { // program change
		int idx = *_position._playPos++;
		info.basic.param1 = idx & 0x7f;
		info.basic.param2 = 0;
		}
		break;
	case 0xD:
		info.basic.param1 = *_position._playPos++;
		info.basic.param2 = 0;
		break;

	case 0xB:
		info.basic.param1 = *_position._playPos++;
		info.basic.param2 = *_position._playPos++;
		info.length = 0;
		break;

	case 0x8:
	case 0x9:
	case 0xA:
	case 0xE:
		info.basic.param1 = *(_position._playPos++);
		info.basic.param2 = *(_position._playPos++);
		if (info.command() == 0x9 && info.basic.param2 == 0) {
			// NoteOn with param2==0 is a NoteOff
			info.event = info.channel() | 0x80;
		}
		info.length = 0;
		break;
	case 0xF:
		if (info.event == 0xFF) {
			error("SysEx META event 0xFF");

			byte type = *(_position._playPos++);
			switch(type) {
			case 0x2F:
				// End of Track
				allNotesOff();
				stopPlaying();
				unloadMusic();
				return;
			case 0x51:
				warning("TODO: 0xFF / 0x51");
				return;
			default:
				warning("TODO: 0xFF / %x Unknown", type);
				break;
			}
		} else if (info.event == 0xFC) {
			// Official End-Of-Track signal
			debugC(kDebugLevelMusic, "Music: System META event 0xFC");

			byte type = *(_position._playPos++);
			switch (type) {
			case 0x80: // end of track, triggers looping
				debugC(kDebugLevelMusic, "Music: META event triggered looping");
				jumpToTick(0, true, true, false);
				break;
			case 0x81: // end of track, stop playing
				debugC(kDebugLevelMusic, "Music: META event triggered music stop");
				stopPlaying();
				unloadMusic();
				break;
			default:
				error("MidiParser_SH::parseNextEvent: Unknown META event 0xFC type %x", type);
				break;
			}
		} else {
			warning("TODO: %x / Unknown", info.event);
			break;
		}
		break;
	default:
		warning("MidiParser_SH::parseNextEvent: Unsupported event code %x", info.event);
		break;
	}// switch (info.command())
}

bool MidiParser_SH::loadMusic(byte *musData, uint32 musDataSize) {
	Common::StackLock lock(_mutex);

	debugC(kDebugLevelMusic, "Music: loadMusic()");
	unloadMusic();

	_musData     = musData;
	_musDataSize = musDataSize;

	byte  *headerPtr = _musData + 12; // skip over the already checked SPACE header
	byte  *pos       = headerPtr;

	uint16 headerSize = READ_LE_UINT16(headerPtr);
	assert(headerSize == 0x7F); // Security check

	// Skip over header
	pos += headerSize;

	_lastEvent = 0;
	_trackEnd = _musData + _musDataSize;

	_numTracks = 1;
	_tracks[0] = pos;
	
	_ppqn = 1;
	setTempo(16667);
	setTrack(0);

	return true;
}

void MidiParser_SH::unloadMusic() {
	Common::StackLock lock(_mutex);

	if (_musData) {
		delete[] _musData;
		_musData = NULL;
		_musDataSize = 0;
	}

	MidiParser::unloadMusic();
}

/*----------------------------------------------------------------*/

Music::Music(SherlockEngine *vm, Audio::Mixer *mixer) : _vm(vm), _mixer(mixer) {
	_midiDriver = NULL;
	_midiParser = NULL;
	_musicType = MT_NULL;
	_musicPlaying = false;
	_midiOption = false;
	_midiMusicData = nullptr;
	_musicVolume = ConfMan.hasKey("music_volume") ? ConfMan.getInt("music_volume") : 255;

	if (IS_3DO) {
		// 3DO - uses digital samples for music
		_musicOn = ConfMan.hasKey("music_mute") ? !ConfMan.getBool("music_mute") : true;
		return;
	}

	if (_vm->_interactiveFl)
		_vm->_res->addToCache("MUSIC.LIB");

	MidiDriver::DeviceHandle dev;

	if (IS_SERRATED_SCALPEL) {
		// Serrated Scalpel: used an internal Electronic Arts .MUS music engine
		_midiParser = new MidiParser_SH();
		dev = MidiDriver::detectDevice(MDT_MIDI | MDT_ADLIB | MDT_PREFER_MT32);
		_musicType = MidiDriver::getMusicType(dev);

		switch (_musicType) {
		case MT_ADLIB:
			_midiDriver = MidiDriver_SH_AdLib_create();
			break;
		case MT_MT32:
			_midiDriver = MidiDriver_MT32_create();
			break;
		case MT_GM:
			if (ConfMan.getBool("native_mt32")) {
				_midiDriver = MidiDriver_MT32_create();
				_musicType = MT_MT32;
			}
			break;
		default:
			// Create default one
			// I guess we shouldn't do this anymore
			//_midiDriver = MidiDriver::createMidi(dev);
			break;
		}
	} else {
		// Rose Tattooo: seems to use Miles Audio 3
		_midiParser = MidiParser::createParser_XMIDI();
		dev = MidiDriver::detectDevice(MDT_MIDI | MDT_ADLIB | MDT_PREFER_GM);
		_musicType = MidiDriver::getMusicType(dev);

		switch (_musicType) {
		case MT_ADLIB:
			// SAMPLE.AD  -> regular AdLib instrument data
			// SAMPLE.OPL -> OPL-3 instrument data
			// although in case of Rose Tattoo both files are exactly the same
			_midiDriver = Audio::MidiDriver_Miles_AdLib_create("SAMPLE.AD", "SAMPLE.OPL");
			break;
		case MT_MT32:
			// Sherlock Holmes 2 does not have a MT32 timbre file
			_midiDriver = Audio::MidiDriver_Miles_MT32_create("");
			break;
		case MT_GM:
			if (ConfMan.getBool("native_mt32")) {
				_midiDriver = Audio::MidiDriver_Miles_MT32_create("");
				_musicType = MT_MT32;
			} else {
				_midiDriver = MidiDriver::createMidi(dev);
				_musicType = MT_GM;
			}
			break;
		default:
			// Do not create anything
			break;
		}
	}

	if (_midiDriver) {
		int ret = _midiDriver->open();
		if (ret == 0) {
			// Reset is done inside our MIDI driver
			_midiDriver->setTimerCallback(_midiParser, &_midiParser->timerCallback);
		}
		_midiParser->setMidiDriver(_midiDriver);
		_midiParser->setTimerRate(_midiDriver->getBaseTempo());

		if (IS_SERRATED_SCALPEL) {
			if (_musicType == MT_MT32) {
				// Upload patches
				Common::SeekableReadStream *MT32driverStream = _vm->_res->load("MTHOM.DRV", "MUSIC.LIB");

				if (!MT32driverStream)
					error("Music: could not load MTHOM.DRV, critical");

				byte *MT32driverData = new byte[MT32driverStream->size()];
				int32 MT32driverDataSize = MT32driverStream->size();
				assert(MT32driverData);

				MT32driverStream->read(MT32driverData, MT32driverDataSize);
				delete MT32driverStream;

				assert(MT32driverDataSize > 12);
				byte *MT32driverDataPtr = MT32driverData + 12;
				MT32driverDataSize -= 12;

				MidiDriver_MT32_uploadPatches(_midiDriver, MT32driverDataPtr, MT32driverDataSize);
				delete[] MT32driverData;
			}
		}

		_musicOn = ConfMan.hasKey("music_mute") ? !ConfMan.getBool("music_mute") : true;
	}
}

Music::~Music() {
	stopMusic();
	if (_midiDriver) {
		_midiDriver->setTimerCallback(this, NULL);
	}
	if (_midiParser) {
		_midiParser->stopPlaying();
		delete _midiParser;
		_midiParser = nullptr;
	}
	if (_midiDriver) {
		_midiDriver->close();
		delete _midiDriver;
	}
}

bool Music::loadSong(int songNumber) {
	debugC(kDebugLevelMusic, "Music: loadSong()");

	if(songNumber == 100)
		songNumber = 55;
	else if(songNumber == 70)
		songNumber = 54;

	if((songNumber > 60) || (songNumber < 1))
		return false;

	songNumber = ROOM_SONG[songNumber];

	if(songNumber == 0)
		songNumber = 12;

	if((songNumber > NUM_SONGS) || (songNumber < 1))
		return false;

	Common::String songName = Common::String(SONG_NAMES[songNumber - 1]);

	freeSong();  // free any song that is currently loaded
	stopMusic();

	if (!playMusic(songName))
		return false;

	startSong();
	return true;
}

bool Music::loadSong(const Common::String &songName) {
	freeSong();  // free any song that is currently loaded
	stopMusic();

	if (!playMusic(songName))
		return false;

	startSong();
	return true;
}

void Music::syncMusicSettings() {
	_musicOn = !ConfMan.getBool("mute") && !ConfMan.getBool("music_mute");
}

bool Music::playMusic(const Common::String &name) {
	if (!_musicOn)
		return false;

	_nextSongName = _currentSongName = name;
	debugC(kDebugLevelMusic, "Music: playMusic('%s')", name.c_str());

	if (!IS_3DO) {
		// MIDI based
		if (!_midiDriver)
			return false;

		Common::String midiMusicName = (IS_SERRATED_SCALPEL) ? name + ".MUS" : name + ".XMI";
		Common::SeekableReadStream *stream = _vm->_res->load(midiMusicName, "MUSIC.LIB");

		byte *midiMusicData     = new byte[stream->size()];
		int32 midiMusicDataSize = stream->size();

		stream->read(midiMusicData, midiMusicDataSize);
		delete stream;

		if (midiMusicDataSize < 14) {
			warning("Music: not enough data in music file");
			delete[] midiMusicData;
			return false;
		}

		byte  *dataPos  = midiMusicData;
		uint32 dataSize = midiMusicDataSize;

		if (IS_SERRATED_SCALPEL) {
			if (memcmp("            ", dataPos, 12)) {
				warning("Music: expected header not found in music file");
				delete[] midiMusicData;
				return false;
			}
			dataPos += 12;
			dataSize -= 12;

			if (dataSize < 0x7F) {
				warning("Music: expected music header not found in music file");
				delete[] midiMusicData;
				return false;
			}

			uint16 headerSize = READ_LE_UINT16(dataPos);
			if (headerSize != 0x7F) {
				warning("Music: header is not as expected");
				delete[] midiMusicData;
				return false;
			}
		} else {
			if (memcmp("FORM", dataPos, 4)) {
				warning("Music: expected header not found in music file");
				delete[] midiMusicData;
				return false;
			}
		}

		if (IS_SERRATED_SCALPEL) {
			// Pass the music data to the driver as well
			// because channel mapping and a few other things inside the header
			switch (_musicType) {
			case MT_ADLIB:
				MidiDriver_SH_AdLib_newMusicData(_midiDriver, dataPos, dataSize);
				break;

			case MT_MT32:
				MidiDriver_MT32_newMusicData(_midiDriver, dataPos, dataSize);
				break;

			default:
				// should never happen
				break;
			}
		}

		_midiMusicData = midiMusicData;
		_midiParser->loadMusic(midiMusicData, midiMusicDataSize);
	} else {
		// 3DO: sample based
		Audio::AudioStream *musicStream;
		Common::String digitalMusicName = "music/" + name + "_MW22.aifc";

		if (isPlaying()) {
			_mixer->stopHandle(_digitalMusicHandle);
		}

		Common::File *digitalMusicFile = new Common::File();
		if (!digitalMusicFile->open(digitalMusicName)) {
			warning("playMusic: can not open 3DO music '%s'", digitalMusicName.c_str());
			return false;
		}

		// Try to load the given file as AIFF/AIFC
		musicStream = Audio::makeAIFFStream(digitalMusicFile, DisposeAfterUse::YES);
		if (!musicStream) {
			warning("playMusic: can not load 3DO music '%s'", digitalMusicName.c_str());
			return false;
		}
		_mixer->playStream(Audio::Mixer::kMusicSoundType, &_digitalMusicHandle, musicStream);
	}

	_musicPlaying = true;
	return true;
}

void Music::stopMusic() {
	freeSong();
}

void Music::startSong() {
	// No implementation needed for ScummVM
}

void Music::freeSong() {
	if (!IS_3DO) {
		if (_midiParser->isPlaying())
			_midiParser->stopPlaying();

		// Free the MIDI MUS data buffer
		_midiParser->unloadMusic();
	}

	_midiMusicData = nullptr;
	_musicPlaying = false;
}

bool Music::isPlaying() {
	if (!IS_3DO) {
		// MIDI based
		return _midiParser->isPlaying();
	} else {
		// 3DO: sample based
		return _mixer->isSoundHandleActive(_digitalMusicHandle);
	}
}

// Returns the current music position in milliseconds
uint32 Music::getCurrentPosition() {
	if (!IS_3DO) {
		// MIDI based
		return (_midiParser->getTick() * 1000) / 60; // translate tick to millisecond
	} else {
		// 3DO: sample based
		return _mixer->getSoundElapsedTime(_digitalMusicHandle);
	}
}

// This is used to wait for the music in certain situations like especially the intro
// Note: the original game didn't do this, instead it just waited for certain amounts of time
//       We do this, so that the intro graphics + music work together even on faster/slower hardware.
bool Music::waitUntilMSec(uint32 msecTarget, uint32 msecMax, uint32 additionalDelay, uint32 noMusicDelay) {
	uint32 msecCurrent = 0;

	if (!isPlaying()) {
		return _vm->_events->delay(noMusicDelay, true);
	}
	while (1) {
		if (!isPlaying()) { // Music is not playing anymore -> we are done
			if (additionalDelay > 0) {
				if (!_vm->_events->delay(additionalDelay, true))
					return false;
			}
			return true;
		}

		msecCurrent = getCurrentPosition();
		//warning("waitUntilMSec: %lx", msecCurrent);

		if ((!msecMax) || (msecCurrent <= msecMax)) {
			if (msecCurrent >= msecTarget) {
				if (additionalDelay > 0) {
					if (!_vm->_events->delay(additionalDelay, true))
						return false;
				}
				return true;
			}
		}
		if (!_vm->_events->delay(10, true))
			return false;
	}
}

void Music::setMusicVolume(int volume) {
	_musicVolume = volume;
	_musicOn = volume > 0;
	_vm->_mixer->setVolumeForSoundType(Audio::Mixer::kMusicSoundType, volume);
}

void Music::getSongNames(Common::StringArray &songs) {
	songs.clear();
	if (IS_SERRATED_SCALPEL) {
		if (IS_3DO) {
			Common::FSDirectory gameDirectory(ConfMan.get("path"));
			Common::FSDirectory *musicDirectory = gameDirectory.getSubDirectory("music");
			Common::ArchiveMemberList files;

			musicDirectory->listMatchingMembers(files, "*_mw22.aifc");

			for (Common::ArchiveMemberList::iterator i = files.begin(); i != files.end(); ++i) {
				Common::String name = (*i)->getName();
				name.erase(name.size() - 10);
				songs.push_back(name);
			}
		} else {
			for (int i = 0; i < ARRAYSIZE(SONG_NAMES); i++) {
				songs.push_back(SONG_NAMES[i]);
			}
		}
	} else {
		Common::StringArray fileList;
		_vm->_res->getResourceNames("music.lib", fileList);
		for (Common::StringArray::iterator i = fileList.begin(); i != fileList.end(); ++i) {
			if ((*i).matchString("*.XMI", true)) {
				(*i).erase((*i).size() - 4);
				songs.push_back(*i);
			}
		}
	}
	Common::sort(songs.begin(), songs.end());
}

void Music::checkSongProgress() {
	if (!isPlaying()) {
		playMusic(_nextSongName);
	}
}

} // End of namespace Sherlock
