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#include "mediadiscoverybackend.h"
#include "usbdevice.h"

#include <QtDebug>
#include <QTimer>
#include <QSettings>

Q_LOGGING_CATEGORY(qLcROQIviMediaDiscovery, "qtivi.media.qivimediadiscoverybackend.remoteobjects", QtInfoMsg)

MediaDiscoveryBackend::MediaDiscoveryBackend(QObject *parent)
    : QIviMediaDeviceDiscoveryModelBackendInterface(parent)
    , m_node(nullptr)
    , m_initialized(false)
    , m_helper(new QIviRemoteObjectReplicaHelper(qLcROQIviMediaDiscovery(), this))
{
}

void MediaDiscoveryBackend::initialize()
{
    if (!connectToNode())
        return;

    if (m_replica->isInitialized()) {
        onDevicesChanged(m_replica->devices());
        emit initializationDone();
    }

    QTimer::singleShot(3000, this, [this](){
        if (!m_replica->isInitialized())
            qCCritical(qLcROQIviMediaDiscovery) << "QtIviMedia.QIviMediaDiscoveryModel wasn't initialized within the timeout period. Please make sure the server is running.";
    });
}

void MediaDiscoveryBackend::onDevicesChanged(const QStringList &devices)
{
    if (m_initialized)
        return;

    for (const QString &device : devices) {
        qCInfo(qLcROQIviMediaDiscovery) << "Adding USB Device: " << device;
        m_deviceMap.insert(device, new USBDevice(device));
    }
    emit availableDevices(m_deviceMap.values());
    m_initialized = true;
}

void MediaDiscoveryBackend::onDeviceAdded(const QString &device)
{
    USBDevice *dev = new USBDevice(device);
    m_deviceMap.insert(device, dev);
    emit deviceAdded(dev);
}

void MediaDiscoveryBackend::onDeviceRemoved(const QString &device)
{
    QIviServiceObject *dev = m_deviceMap.take(device);
    emit deviceRemoved(dev);
}

bool MediaDiscoveryBackend::connectToNode()
{
    static QString configPath;
    if (configPath.isEmpty()) {
        if (qEnvironmentVariableIsSet("SERVER_CONF_PATH")) {
            configPath = QString::fromLocal8Bit(qgetenv("SERVER_CONF_PATH"));
        } else {
            configPath = QStringLiteral("./server.conf");
            qCInfo(qLcROQIviMediaDiscovery) << "Environment variable SERVER_CONF_PATH not defined, using " << configPath;
        }
    }

    QSettings settings(configPath, QSettings::IniFormat);
    settings.beginGroup(QStringLiteral("qtivimedia"));
    QUrl registryUrl = QUrl(settings.value(QStringLiteral("Registry"), QStringLiteral("local:qtivimedia")).toString());
    if (m_url != registryUrl) {
        m_url = registryUrl;
        // QtRO doesn't allow to change the URL without destroying the Node
        delete m_node;
        m_node = new QRemoteObjectNode(this);
        if (!m_node->connectToNode(m_url)) {
            qCCritical(qLcROQIviMediaDiscovery) << "Connection to" << m_url << "failed!";
            m_replica.reset();
            return false;
        }
        qCInfo(qLcROQIviMediaDiscovery) << "Connecting to" << m_url;
             m_replica.reset(m_node->acquire<QIviMediaDiscoveryModelReplica>(QStringLiteral("QtIviMedia.QIviMediaDiscoveryModel")));
        setupConnections();
    }
    return true;
}

void MediaDiscoveryBackend::setupConnections()
{
    connect(m_node, &QRemoteObjectNode::error, m_helper, &QIviRemoteObjectReplicaHelper::onNodeError);
    connect(m_helper, &QIviRemoteObjectReplicaHelper::errorChanged, this, &QIviFeatureInterface::errorChanged);
    connect(m_replica.data(), &QRemoteObjectReplica::stateChanged, m_helper, &QIviRemoteObjectReplicaHelper::onReplicaStateChanged);
    connect(m_replica.data(), &QRemoteObjectReplica::initialized, this, &QIviFeatureInterface::initializationDone);
    connect(m_replica.data(), &QIviMediaDiscoveryModelReplica::devicesChanged, this, &MediaDiscoveryBackend::onDevicesChanged);
    connect(m_replica.data(), &QIviMediaDiscoveryModelReplica::deviceAdded, this, &MediaDiscoveryBackend::onDeviceAdded);
    connect(m_replica.data(), &QIviMediaDiscoveryModelReplica::deviceRemoved, this, &MediaDiscoveryBackend::onDeviceRemoved);
}