#include "signals.h"
#include "libstatus.h"
#include <QDebug>
#include <QJsonDocument>
#include <QJsonObject>
#include <QObject>
#include <QtConcurrent>

namespace Signals
{

Manager* Manager::theInstance;

Manager* Manager::instance()
{
    if(theInstance == 0) theInstance = new Manager();
    return theInstance;
}

std::map<QString, SignalType> Manager::signalMap;

Manager::Manager(QObject* parent)
    : QObject(parent)
{
    SetSignalEventCallback((void*)&Manager::signalCallback);

    signalMap = {{"node.ready", SignalType::NodeReady},
                 {"node.started", SignalType::NodeStarted},
                 {"node.stopped", SignalType::NodeStopped},
                 {"node.login", SignalType::NodeLogin},
                 {"node.crashed", SignalType::NodeCrashed}};
}

void Manager::processSignal(QString statusSignal)
{
    try
    {
        QJsonParseError json_error;
        const QJsonDocument signalEventDoc(QJsonDocument::fromJson(statusSignal.toUtf8(), &json_error));
        if(json_error.error != QJsonParseError::NoError)
        {
            qWarning() << "Invalid signal received";
            return;
        }
        decode(signalEventDoc.object());
    }
    catch(const std::exception& e)
    {
        qWarning() << "Error decoding signal, err: ", e.what();
        return;
    }
}

void Manager::decode(const QJsonObject& signalEvent)
{
    SignalType signalType(Unknown);
    if(!signalMap.count(signalEvent["type"].toString()))
    {
        qWarning() << "Unknown signal received: " << signalEvent["type"].toString();
        return;
    }

    signalType = signalMap[signalEvent["type"].toString()];

    switch(signalType)
    {
        // TODO: create extractor functions like in nim
    case NodeLogin: emit instance()->nodeLogin(NodeSignal{signalType, signalEvent["event"]["error"].toString()}); break;
    case NodeReady: emit instance()->nodeReady(NodeSignal{signalType, signalEvent["event"]["error"].toString()}); break;
    case NodeStarted:
        emit instance()->nodeStarted(NodeSignal{signalType, signalEvent["event"]["error"].toString()});
        break;
    case NodeStopped:
        emit instance()->nodeStopped(NodeSignal{signalType, signalEvent["event"]["error"].toString()});
        break;
    case NodeCrashed: {
        auto signal = NodeSignal{signalType, signalEvent["event"]["error"].toString()};
        qWarning() << "node.crashed, error: " << signal.error;
        emit instance()->nodeCrashed(signal);
        break;
    }
    default: qWarning() << "Signal decoding not implemented: " << signalEvent; break;
    }
}

void Manager::signalCallback(const char* data)
{
    QtConcurrent::run(instance(), &Manager::processSignal, QString(data));
}

} // namespace Signals