/*
 * This file is part of smolbote. It's copyrighted by the contributors recorded
 * in the version control history of the file, available from its original
 * location: https://neueland.iserlohn-fortress.net/smolbote.hg
 *
 * SPDX-License-Identifier: GPL-3.0
 */

#include "singleapplication.h"
#include <QDataStream>
#include <QLocalServer>
#include <QLocalSocket>
#include <QJsonObject>
#include <QJsonDocument>

SingleApplication::SingleApplication(int &argc, char **argv)
    : QApplication(argc, argv)
{
}

SingleApplication::~SingleApplication()
{
    if(m_localServer != nullptr) {
        if(m_localServer->isListening()) {
            m_localServer->close();
            QLocalServer::removeServer(LOCALSERVER_KEY);
        }
    }
}

/**
 * @brief SingleApplication::bindLocalSocket check for running local server by connecting to it
 * @return true if no other instance, false otherwise
 */
bool SingleApplication::bindLocalSocket(const QString &name)
{
    LOCALSERVER_KEY = name;

    QLocalSocket socket;
    socket.connectToServer(LOCALSERVER_KEY);

    if(socket.waitForConnected(LOCALSERVER_TIMEOUT)) {
        // another server is running
        socket.close();
        return false;
    }

    // there is either no such socket, or the socket wasn't cleaned up
    else {
        m_localServer = new QLocalServer(this);
        connect(m_localServer, &QLocalServer::newConnection, this, &SingleApplication::receiveMessage);

        // no other server
        QLocalServer::removeServer(LOCALSERVER_KEY);
        return m_localServer->listen(LOCALSERVER_KEY);
    }
}

QString SingleApplication::serverName() const
{
    Q_CHECK_PTR(m_localServer);
    return m_localServer->fullServerName();
}

int SingleApplication::sendMessage(const QByteArray &data)
{
    QLocalSocket socket;
    socket.connectToServer(LOCALSERVER_KEY);
    if(socket.waitForConnected(LOCALSERVER_TIMEOUT)) {
        socket.write(data);
        socket.waitForBytesWritten(LOCALSERVER_TIMEOUT);
        return EXIT_SUCCESS;
    }
    return EXIT_FAILURE;
}

int SingleApplication::sendMessage(const QJsonObject &message)
{
    QLocalSocket socket;
    socket.connectToServer(LOCALSERVER_KEY);
    if(socket.waitForConnected(LOCALSERVER_TIMEOUT)) {
        socket.write(QJsonDocument(message).toJson());
        socket.waitForBytesWritten(LOCALSERVER_TIMEOUT);
        return EXIT_SUCCESS;
    }

    return EXIT_FAILURE;
}

void SingleApplication::receiveMessage()
{
    QLocalSocket *socket = m_localServer->nextPendingConnection();
    if(socket == nullptr) {
        return;
    }

    socket->waitForReadyRead();
    auto message = socket->readAll();

    if(message.isEmpty())
        return;

#ifdef QT_DEBUG
    qDebug("received message: %s", qUtf8Printable(message));
#endif

    QJsonDocument doc = QJsonDocument::fromJson(message);
    emit messageAvailable(doc.object());
}