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** Copyright (C) 2016 The Qt Company Ltd.
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** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
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#include "connectionserver.h"

#include <ipcserverinterface.h>

#include <QCoreApplication>
#include <QLocalSocket>
#include <QTimer>

#include <cstdlib>

namespace ClangBackEnd {

QString ConnectionServer::connectionName;

ConnectionServer::ConnectionServer(const QString &connectionName)
    : aliveTimerId(startTimer(5000))
{
    this->connectionName = connectionName;

    connect(&localServer, &QLocalServer::newConnection, this, &ConnectionServer::handleNewConnection);
    std::atexit(&ConnectionServer::removeServer);
#if defined(_GLIBCXX_HAVE_AT_QUICK_EXIT)
    std::at_quick_exit(&ConnectionServer::removeServer);
#endif
    std::set_terminate(&ConnectionServer::removeServer);
}

ConnectionServer::~ConnectionServer()
{
    killTimer(aliveTimerId);
    removeServer();
}

void ConnectionServer::start()
{
    QLocalServer::removeServer(connectionName);
    localServer.listen(connectionName);
}

void ConnectionServer::setIpcServer(IpcServerInterface *ipcServer)
{
    this->ipcServer = ipcServer;

}

int ConnectionServer::clientProxyCount() const
{
    return static_cast<int>(ipcClientProxies.size());
}

void ConnectionServer::timerEvent(QTimerEvent *timerEvent)
{
    if (aliveTimerId == timerEvent->timerId())
        sendAliveMessage();
}

void ConnectionServer::handleNewConnection()
{
    QLocalSocket *localSocket(nextPendingConnection());

    ipcClientProxies.emplace_back(ipcServer, localSocket);

    ipcServer->addClient(&ipcClientProxies.back());

    localSockets.push_back(localSocket);

    emit newConnection();
}

void ConnectionServer::sendAliveMessage()
{
    ipcServer->client()->alive();
}

void ConnectionServer::handleSocketDisconnect()
{
    QLocalSocket *senderLocalSocket = static_cast<QLocalSocket*>(sender());

    removeClientProxyWithLocalSocket(senderLocalSocket);
    localSockets.erase(std::remove_if(localSockets.begin(),
                                      localSockets.end(),
                                      [senderLocalSocket](QLocalSocket *localSocketInList) { return localSocketInList == senderLocalSocket;}));

    delayedExitApplicationIfNoSockedIsConnected();
}

void ConnectionServer::removeClientProxyWithLocalSocket(QLocalSocket *localSocket)
{
    ipcClientProxies.erase(std::remove_if(ipcClientProxies.begin(),
                                          ipcClientProxies.end(),
                                          [localSocket](const IpcClientProxy &client) { return client.isUsingThatIoDevice(localSocket);}));
}

QLocalSocket *ConnectionServer::nextPendingConnection()
{
    QLocalSocket *localSocket = localServer.nextPendingConnection();

    connect(localSocket, &QLocalSocket::disconnected, this, &ConnectionServer::handleSocketDisconnect);

    return localSocket;
}

void ConnectionServer::removeServer()
{
    QLocalServer::removeServer(connectionName);
}

void ConnectionServer::delayedExitApplicationIfNoSockedIsConnected()
{
    if (localSockets.size() == 0)
        QTimer::singleShot(60000, this, &ConnectionServer::exitApplicationIfNoSockedIsConnected);
}

void ConnectionServer::exitApplicationIfNoSockedIsConnected()
{
    if (localSockets.size() == 0)
        QCoreApplication::exit();
}

} // namespace ClangBackEnd