#include "amuse/Sequencer.hpp"
#include "amuse/Submix.hpp"
#include "amuse/Voice.hpp"
#include "amuse/Engine.hpp"

namespace amuse
{

void Sequencer::ChannelState::_bringOutYourDead()
{
    for (auto it = m_chanVoxs.begin() ; it != m_chanVoxs.end() ;)
    {
        Voice* vox = it->second.get();
        vox->_bringOutYourDead();
        if (vox->_isRecursivelyDead())
        {
            it = m_chanVoxs.erase(it);
            continue;
        }
        ++it;
    }

    for (auto it = m_keyoffVoxs.begin() ; it != m_keyoffVoxs.end() ;)
    {
        Voice* vox = it->get();
        vox->_bringOutYourDead();
        if (vox->_isRecursivelyDead())
        {
            it = m_keyoffVoxs.erase(it);
            continue;
        }
        ++it;
    }
}

void Sequencer::_bringOutYourDead()
{
    for (auto& chan : m_chanStates)
        if (chan)
            chan->_bringOutYourDead();

    if (!m_arrData && m_dieOnEnd && getVoiceCount() == 0)
        m_state = SequencerState::Dead;
}

void Sequencer::_destroy()
{
    Entity::_destroy();
    if (m_submix)
    {
        m_engine.removeSubmix(m_submix);
        m_submix = nullptr;
    }        
}

Sequencer::~Sequencer()
{
    if (m_submix)
    {
        m_engine.removeSubmix(m_submix);
        m_submix = nullptr;
    }
}

Sequencer::Sequencer(Engine& engine, const AudioGroup& group, int groupId,
                     const SongGroupIndex& songGroup, int setupId, Submix* smx)
: Entity(engine, group, groupId), m_songGroup(songGroup)
{
    auto it = m_songGroup.m_midiSetups.find(setupId);
    if (it != m_songGroup.m_midiSetups.cend())
        m_midiSetup = it->second->data();

    m_submix = m_engine.addSubmix(smx);
    m_submix->makeReverbHi(0.2f, 0.65f, 1.f, 0.5f, 0.f, 0.f);
}

Sequencer::ChannelState::~ChannelState()
{
}

Sequencer::ChannelState::ChannelState(Sequencer& parent, uint8_t chanId)
: m_parent(parent), m_chanId(chanId)
{
    if (m_parent.m_midiSetup)
    {
        m_setup = &m_parent.m_midiSetup[chanId];

        if (chanId == 9)
        {
            auto it = m_parent.m_songGroup.m_drumPages.find(m_setup->programNo);
            if (it != m_parent.m_songGroup.m_drumPages.cend())
                m_page = it->second;
        }
        else
        {
            auto it = m_parent.m_songGroup.m_normPages.find(m_setup->programNo);
            if (it != m_parent.m_songGroup.m_normPages.cend())
                m_page = it->second;
        }

        m_curVol = m_setup->volume / 127.f;
        m_curPan = m_setup->panning / 64.f - 1.f;
        m_ctrlVals[0x5b] = m_setup->reverb;
        m_ctrlVals[0x5d] = m_setup->chorus;
    }
    else
    {
        if (chanId == 9)
        {
            auto it = m_parent.m_songGroup.m_drumPages.find(0);
            if (it != m_parent.m_songGroup.m_drumPages.cend())
                m_page = it->second;
        }
        else
        {
            auto it = m_parent.m_songGroup.m_normPages.find(0);
            if (it != m_parent.m_songGroup.m_normPages.cend())
                m_page = it->second;
        }
        
        m_curVol = 1.f;
        m_curPan = 0.f;
        m_ctrlVals[0x5b] = 0;
        m_ctrlVals[0x5d] = 0;
    }

    m_ctrlVals[7] = 127;
    m_ctrlVals[10] = 64;
}

void Sequencer::advance(double dt)
{
    if (m_state == SequencerState::Playing)
        if (m_songState.advance(*this, dt))
        {
            m_arrData = nullptr;
            m_state = SequencerState::Interactive;
            allOff();
        }
}

size_t Sequencer::ChannelState::getVoiceCount() const
{
    size_t ret = 0;
    for (const auto& vox : m_chanVoxs)
        ret += vox.second->getTotalVoices();
    for (const auto& vox : m_keyoffVoxs)
        ret += vox->getTotalVoices();
    return ret;
}

size_t Sequencer::getVoiceCount() const
{
    size_t ret = 0;
    for (const auto& chan : m_chanStates)
        if (chan)
            ret += chan->getVoiceCount();
    return ret;
}

std::shared_ptr<Voice> Sequencer::ChannelState::keyOn(uint8_t note, uint8_t velocity)
{
    if (!m_page)
        return {};

    /* If portamento is enabled for voice, pre-empt spawning new voices */
    if (std::shared_ptr<Voice> lastVoice = m_lastVoice.lock())
    {
        uint8_t lastNote = lastVoice->getLastNote();
        if (lastVoice->doPortamento(note))
        {
            m_chanVoxs.erase(lastNote);
            m_chanVoxs[note] = lastVoice;
            return lastVoice;
        }
    }

    /* Ensure keyoff sent first */
    auto keySearch = m_chanVoxs.find(note);
    if (keySearch != m_chanVoxs.cend())
    {
        if (keySearch->second == m_lastVoice.lock())
            m_lastVoice.reset();
        keySearch->second->keyOff();
        keySearch->second->setPedal(false);
        m_keyoffVoxs.emplace(std::move(keySearch->second));
        m_chanVoxs.erase(keySearch);
    }

    std::list<std::shared_ptr<Voice>>::iterator ret =
        m_parent.m_engine._allocateVoice(m_parent.m_audioGroup,
                                         m_parent.m_groupId, 32000.0,
                                         true, false, m_parent.m_submix);
    if (*ret)
    {
        m_chanVoxs[note] = *ret;
        (*ret)->installCtrlValues(m_ctrlVals);

        ObjectId oid = (m_parent.m_audioGroup.getDataFormat() == DataFormat::PC) ? m_page->objId : SBig(m_page->objId);
        if (!(*ret)->loadSoundObject(oid, 0, m_parent.m_ticksPerSec, note, velocity, m_ctrlVals[1]))
        {
            m_parent.m_engine._destroyVoice(ret);
            return {};
        }
        (*ret)->setVolume(m_parent.m_curVol * m_curVol);
        (*ret)->setReverbVol(m_ctrlVals[0x5b] / 127.f);
        (*ret)->setPan(m_curPan);
        (*ret)->setPitchWheel(m_curPitchWheel);

        if (m_ctrlVals[64] > 64)
            (*ret)->setPedal(true);

        m_lastVoice = *ret;
    }

    return *ret;
}

std::shared_ptr<Voice> Sequencer::keyOn(uint8_t chan, uint8_t note, uint8_t velocity)
{
    if (chan > 15)
        return {};

    if (!m_chanStates[chan])
        m_chanStates[chan].emplace(*this, chan);

    return m_chanStates[chan]->keyOn(note, velocity);
}

void Sequencer::ChannelState::keyOff(uint8_t note, uint8_t velocity)
{
    auto keySearch = m_chanVoxs.find(note);
    if (keySearch == m_chanVoxs.cend())
        return;

    if (keySearch->second == m_lastVoice.lock())
        m_lastVoice.reset();
    keySearch->second->keyOff();
    m_keyoffVoxs.emplace(std::move(keySearch->second));
    m_chanVoxs.erase(keySearch);
}

void Sequencer::keyOff(uint8_t chan, uint8_t note, uint8_t velocity)
{
    if (chan > 15 || !m_chanStates[chan])
        return;

    m_chanStates[chan]->keyOff(note, velocity);
}

void Sequencer::ChannelState::setCtrlValue(uint8_t ctrl, int8_t val)
{
    m_ctrlVals[ctrl] = val;
    for (const auto& vox : m_chanVoxs)
        vox.second->_notifyCtrlChange(ctrl, val);
    for (const auto& vox : m_keyoffVoxs)
        vox->_notifyCtrlChange(ctrl, val);

    switch (ctrl)
    {
    case 7:
        setVolume(val / 127.f);
        break;
    case 10:
        setPan(val / 64.f - 1.f);
        break;
    default: break;
    }
}

bool Sequencer::ChannelState::programChange(int8_t prog)
{
    if (m_chanId == 9)
    {
        auto it = m_parent.m_songGroup.m_drumPages.find(prog);
        if (it != m_parent.m_songGroup.m_drumPages.cend())
        {
            m_page = it->second;
            m_curProgram = prog;
            return true;
        }
    }
    else
    {
        auto it = m_parent.m_songGroup.m_normPages.find(prog);
        if (it != m_parent.m_songGroup.m_normPages.cend())
        {
            m_page = it->second;
            m_curProgram = prog;
            return true;
        }
    }
    return false;
}

void Sequencer::ChannelState::nextProgram()
{
    int newProg = m_curProgram;
    while ((newProg += 1) <= 127)
        if (programChange(newProg))
            break;
}

void Sequencer::ChannelState::prevProgram()
{
    int newProg = m_curProgram;
    while ((newProg -= 1) >= 0)
        if (programChange(newProg))
            break;
}

void Sequencer::setCtrlValue(uint8_t chan, uint8_t ctrl, int8_t val)
{
    if (chan > 15)
        return;

    if (!m_chanStates[chan])
        m_chanStates[chan].emplace(*this, chan);

    m_chanStates[chan]->setCtrlValue(ctrl, val);
}

void Sequencer::ChannelState::setPitchWheel(float pitchWheel)
{
    m_curPitchWheel = pitchWheel;
    for (const auto& vox : m_chanVoxs)
        vox.second->setPitchWheel(pitchWheel);
    for (const auto& vox : m_keyoffVoxs)
        vox->setPitchWheel(pitchWheel);
}

void Sequencer::setPitchWheel(uint8_t chan, float pitchWheel)
{
    if (chan > 15)
        return;

    if (!m_chanStates[chan])
        m_chanStates[chan].emplace(*this, chan);

    m_chanStates[chan]->setPitchWheel(pitchWheel);
}

void Sequencer::setTempo(double ticksPerSec)
{
    m_ticksPerSec = ticksPerSec;
}

void Sequencer::ChannelState::allOff()
{
    for (auto it = m_chanVoxs.begin() ; it != m_chanVoxs.end() ;)
    {
        if (it->second == m_lastVoice.lock())
            m_lastVoice.reset();
        it->second->keyOff();
        m_keyoffVoxs.emplace(std::move(it->second));
        it = m_chanVoxs.erase(it);
    }
}

void Sequencer::allOff(bool now)
{
    if (now)
        for (auto& chan : m_chanStates)
        {
            if (chan)
            {
                for (const auto& vox : chan->m_chanVoxs)
                    vox.second->kill();
                for (const auto& vox : chan->m_keyoffVoxs)
                    vox->kill();
                chan->m_chanVoxs.clear();
                chan->m_keyoffVoxs.clear();
            }
        }
    else
        for (auto& chan : m_chanStates)
            if (chan)
                chan->allOff();
}

void Sequencer::allOff(uint8_t chan, bool now)
{
    if (chan > 15 || !m_chanStates[chan])
        return;

    if (now)
    {
        for (const auto& vox : m_chanStates[chan]->m_chanVoxs)
            vox.second->kill();
        for (const auto& vox : m_chanStates[chan]->m_keyoffVoxs)
            vox->kill();
        m_chanStates[chan]->m_chanVoxs.clear();
        m_chanStates[chan]->m_keyoffVoxs.clear();
    }
    else
        m_chanStates[chan]->allOff();
}

void Sequencer::ChannelState::killKeygroup(uint8_t kg, bool now)
{
    for (auto it = m_chanVoxs.begin() ; it != m_chanVoxs.end() ;)
    {
        Voice* vox = it->second.get();
        if (vox->m_keygroup == kg)
        {
            if (it->second == m_lastVoice.lock())
                m_lastVoice.reset();
            if (now)
            {
                it = m_chanVoxs.erase(it);
                continue;
            }
            vox->keyOff();
            m_keyoffVoxs.emplace(std::move(it->second));
            it = m_chanVoxs.erase(it);
            continue;
        }
        ++it;
    }

    if (now)
    {
        for (auto it = m_keyoffVoxs.begin() ; it != m_keyoffVoxs.end() ;)
        {
            Voice* vox = it->get();
            if (vox->m_keygroup == kg)
            {
                it = m_keyoffVoxs.erase(it);
                continue;
            }
            ++it;
        }
    }
}

void Sequencer::killKeygroup(uint8_t kg, bool now)
{
    for (auto& chan : m_chanStates)
        if (chan)
            chan->killKeygroup(kg, now);
}

std::shared_ptr<Voice> Sequencer::ChannelState::findVoice(int vid)
{
    for (const auto& vox : m_chanVoxs)
        if (vox.second->vid() == vid)
            return vox.second;
    for (const auto& vox : m_keyoffVoxs)
        if (vox->vid() == vid)
            return vox;
    return {};
}

std::shared_ptr<Voice> Sequencer::findVoice(int vid)
{
    for (auto& chan : m_chanStates)
    {
        if (chan)
        {
            std::shared_ptr<Voice> ret = chan->findVoice(vid);
            if (ret)
                return ret;
        }
    }
    return {};
}

void Sequencer::ChannelState::sendMacroMessage(ObjectId macroId, int32_t val)
{
    for (const auto& v : m_chanVoxs)
    {
        Voice* vox = v.second.get();
        if (vox->getObjectId() == macroId)
            vox->message(val);
    }
    for (const auto& v : m_keyoffVoxs)
    {
        Voice* vox = v.get();
        if (vox->getObjectId() == macroId)
            vox->message(val);
    }
}

void Sequencer::sendMacroMessage(ObjectId macroId, int32_t val)
{
    for (auto& chan : m_chanStates)
        if (chan)
            chan->sendMacroMessage(macroId, val);
}

void Sequencer::playSong(const unsigned char* arrData, bool dieOnEnd)
{
    m_arrData = arrData;
    m_dieOnEnd = dieOnEnd;
    m_songState.initialize(arrData);
    setTempo(m_songState.getTempo() * 384 / 60);
    m_state = SequencerState::Playing;
}

void Sequencer::stopSong(bool now)
{
    allOff(now);
    m_arrData = nullptr;
    m_state = SequencerState::Interactive;
}

void Sequencer::ChannelState::setVolume(float vol)
{
    m_curVol = vol;
    float voxVol = m_parent.m_curVol * m_curVol;
    for (const auto& v : m_chanVoxs)
    {
        Voice* vox = v.second.get();
        vox->setVolume(voxVol);
    }
    for (const auto& v : m_keyoffVoxs)
    {
        Voice* vox = v.get();
        vox->setVolume(voxVol);
    }
}

void Sequencer::ChannelState::setPan(float pan)
{
    m_curPan = pan;
    for (const auto& v : m_chanVoxs)
    {
        Voice* vox = v.second.get();
        vox->setPan(m_curPan);
    }
    for (const auto& v : m_keyoffVoxs)
    {
        Voice* vox = v.get();
        vox->setPan(m_curPan);
    }
}

void Sequencer::setVolume(float vol)
{
    m_curVol = vol;
    for (auto& chan : m_chanStates)
        if (chan)
            chan->setVolume(chan->m_curVol);
}

int8_t Sequencer::getChanProgram(int8_t chanId) const
{
    if (chanId > 15 || !m_chanStates[chanId])
        return 0;

    return m_chanStates[chanId]->m_curProgram;
}

bool Sequencer::setChanProgram(int8_t chanId, int8_t prog)
{
    if (chanId > 15)
        return false;

    if (!m_chanStates[chanId])
        m_chanStates[chanId].emplace(*this, chanId);

    return m_chanStates[chanId]->programChange(prog);
}

void Sequencer::nextChanProgram(int8_t chanId)
{
    if (chanId > 15)
        return;

    if (!m_chanStates[chanId])
        m_chanStates[chanId].emplace(*this, chanId);

    return m_chanStates[chanId]->nextProgram();
}

void Sequencer::prevChanProgram(int8_t chanId)
{
    if (chanId > 15)
        return;

    if (!m_chanStates[chanId])
        m_chanStates[chanId].emplace(*this, chanId);

    return m_chanStates[chanId]->prevProgram();
}

}