#include "effects/effectchainmanager.h"

#include <QDir>
#include <QDomDocument>
#include <QFile>
#include <QtDebug>

#include "effects/effectsmanager.h"
#include "effects/effectxmlelements.h"
#include "moc_effectchainmanager.cpp"

EffectChainManager::EffectChainManager(UserSettingsPointer pConfig,
                                       EffectsManager* pEffectsManager)
        : QObject(pEffectsManager),
          m_pConfig(pConfig),
          m_pEffectsManager(pEffectsManager) {
}

EffectChainManager::~EffectChainManager() {
    //qDebug() << debugString() << "destroyed";
}

void EffectChainManager::registerInputChannel(const ChannelHandleAndGroup& handle_group) {
    VERIFY_OR_DEBUG_ASSERT(!m_registeredInputChannels.contains(handle_group)) {
        return;
    }
    m_registeredInputChannels.insert(handle_group);

    for (auto& pRack : m_standardEffectRacks) {
        pRack->registerInputChannel(handle_group);
    }
}

void EffectChainManager::registerOutputChannel(const ChannelHandleAndGroup& handle_group) {
    VERIFY_OR_DEBUG_ASSERT(!m_registeredOutputChannels.contains(handle_group)) {
        return;
    }
    m_registeredOutputChannels.insert(handle_group);
}

StandardEffectRackPointer EffectChainManager::addStandardEffectRack() {
    StandardEffectRackPointer pRack(new StandardEffectRack(
        m_pEffectsManager, this, m_standardEffectRacks.size()));
    m_standardEffectRacks.append(pRack);
    m_effectRacksByGroup.insert(pRack->getGroup(), pRack);
    return pRack;
}

StandardEffectRackPointer EffectChainManager::getStandardEffectRack(int i) {
    if (i < 0 || i >= m_standardEffectRacks.size()) {
        return StandardEffectRackPointer();
    }
    return m_standardEffectRacks[i];
}

EqualizerRackPointer EffectChainManager::addEqualizerRack() {
    EqualizerRackPointer pRack(new EqualizerRack(
            m_pEffectsManager, this, m_equalizerEffectRacks.size()));
    m_equalizerEffectRacks.append(pRack);
    m_effectRacksByGroup.insert(pRack->getGroup(), pRack);
    return pRack;
}

EqualizerRackPointer EffectChainManager::getEqualizerRack(int i) {
    if (i < 0 || i >= m_equalizerEffectRacks.size()) {
        return EqualizerRackPointer();
    }
    return m_equalizerEffectRacks[i];
}

QuickEffectRackPointer EffectChainManager::addQuickEffectRack() {
    QuickEffectRackPointer pRack(new QuickEffectRack(
        m_pEffectsManager, this, m_quickEffectRacks.size()));
    m_quickEffectRacks.append(pRack);
    m_effectRacksByGroup.insert(pRack->getGroup(), pRack);
    return pRack;
}

QuickEffectRackPointer EffectChainManager::getQuickEffectRack(int i) {
    if (i < 0 || i >= m_quickEffectRacks.size()) {
        return QuickEffectRackPointer();
    }
    return m_quickEffectRacks[i];
}

OutputEffectRackPointer EffectChainManager::addOutputsEffectRack() {
    OutputEffectRackPointer pRack(new OutputEffectRack(
        m_pEffectsManager, this));
    m_pOutputEffectRack = pRack;
    m_effectRacksByGroup.insert(pRack->getGroup(), pRack);
    return m_pOutputEffectRack;
}

OutputEffectRackPointer EffectChainManager::getMasterEffectRack() {
    return m_pOutputEffectRack;
}

EffectRackPointer EffectChainManager::getEffectRack(const QString& group) {
    return m_effectRacksByGroup.value(group);
}

void EffectChainManager::addEffectChain(EffectChainPointer pEffectChain) {
    if (pEffectChain) {
        m_effectChains.append(pEffectChain);
    }
}

void EffectChainManager::removeEffectChain(EffectChainPointer pEffectChain) {
    if (pEffectChain) {
        m_effectChains.removeAll(pEffectChain);
    }
}

EffectChainPointer EffectChainManager::getNextEffectChain(EffectChainPointer pEffectChain) {
    if (m_effectChains.isEmpty()) {
        return EffectChainPointer();
    }

    if (!pEffectChain) {
        return m_effectChains[0];
    }

    int indexOf = m_effectChains.lastIndexOf(pEffectChain);
    if (indexOf == -1) {
        qWarning() << debugString() << "WARNING: getNextEffectChain called for an unmanaged EffectChain";
        return m_effectChains[0];
    }

    return m_effectChains[(indexOf + 1) % m_effectChains.size()];
}

EffectChainPointer EffectChainManager::getPrevEffectChain(EffectChainPointer pEffectChain) {
    if (m_effectChains.isEmpty()) {
        return EffectChainPointer();
    }

    if (!pEffectChain) {
        return m_effectChains[m_effectChains.size()-1];
    }

    int indexOf = m_effectChains.lastIndexOf(pEffectChain);
    if (indexOf == -1) {
        qWarning() << debugString() << "WARNING: getPrevEffectChain called for an unmanaged EffectChain";
        return m_effectChains[m_effectChains.size()-1];
    }

    return m_effectChains[(indexOf - 1 + m_effectChains.size()) % m_effectChains.size()];
}

void EffectChainManager::refeshAllRacks() {
    for (const auto& pRack : qAsConst(m_standardEffectRacks)) {
        pRack->refresh();
    }
    for (const auto& pRack : qAsConst(m_equalizerEffectRacks)) {
        pRack->refresh();
    }
    for (const auto& pRack : qAsConst(m_quickEffectRacks)) {
        pRack->refresh();
    }
}

bool EffectChainManager::saveEffectChains() {
    QDomDocument doc("MixxxEffects");

    QString blank = "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"
        "<" + EffectXml::Root + " schemaVersion=\"" +
              QString::number(EffectXml::kXmlSchemaVersion) + "\">\n"
        "</" + EffectXml::Root + ">\n";
    doc.setContent(blank);

    QDomElement rootNode = doc.documentElement();

    for (const StandardEffectRackPointer& pRack : qAsConst(m_standardEffectRacks)) {
        rootNode.appendChild(pRack->toXml(&doc));
    }
    // TODO? Save QuickEffects in effects.xml too, or keep stored in ConfigObjects?
//     foreach(EffectRackPointer pRack, m_quickEffectRacks) {
//         rootNode.appendChild(pRack->toXML(&doc));
//     }

    QDir settingsPath(m_pConfig->getSettingsPath());

    if (!settingsPath.exists()) {
        return false;
    }

    QFile file(settingsPath.absoluteFilePath("effects.xml"));

    // TODO(rryan): overwrite the right way.
    if (!file.open(QIODevice::Truncate | QIODevice::WriteOnly)) {
        return false;
    }

    QString effectsXml = doc.toString();
    file.write(effectsXml.toUtf8());
    file.close();
    return true;
}

void EffectChainManager::loadEffectChains() {
    QDir settingsPath(m_pConfig->getSettingsPath());
    QFile file(settingsPath.absoluteFilePath("effects.xml"));
    QDomDocument doc;

    QDomElement emptyChainElement = doc.createElement(EffectXml::Chain);
    // Check that XML file can be opened and is valid XML
    if (!file.open(QIODevice::ReadOnly) || !doc.setContent(&file)) {
        return;
    }

    QDomElement root = doc.documentElement();
    QDomElement rackElement = XmlParse::selectElement(root, EffectXml::Rack);
    QDomElement chainsElement = XmlParse::selectElement(rackElement, EffectXml::ChainsRoot);
    QDomNodeList chainsList = chainsElement.elementsByTagName(EffectXml::Chain);

    for (int i = 0; i < chainsList.count(); ++i) {
        QDomNode chainNode = chainsList.at(i);

        if (chainNode.isElement()) {
            QDomElement chainElement = chainNode.toElement();
            EffectChainPointer pChain = EffectChain::createFromXml(
                    m_pEffectsManager, chainElement);
            if (pChain) { // null = ejected chains.
                EffectChainSlotPointer pChainSlot = getStandardEffectRack(0)->getEffectChainSlot(i);
                if (pChainSlot) {
                    pChainSlot->loadEffectChainToSlot(pChain);
                    pChainSlot->loadChainSlotFromXml(chainElement);
                    pChain->addToEngine(getStandardEffectRack(0)->getEngineEffectRack(), i);
                    pChain->updateEngineState();
                    pChainSlot->updateRoutingSwitches();
                }
            }
        }
    }
}

bool EffectChainManager::isAdoptMetaknobValueEnabled() const {
    return m_pConfig->getValue(ConfigKey("[Effects]", "AdoptMetaknobValue"), true);
}