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#include "dbusconnection_p.h"

#include <QtDBus/QDBusMessage>
#include <qdebug.h>

QT_BEGIN_NAMESPACE

/*!
    \class DBusConnection
    \internal
    \brief Connects to the accessibility dbus.

    This is usually a different bus from the session bus.
*/
DBusConnection::DBusConnection()
    : dbusConnection(connectDBus())
{}

QDBusConnection DBusConnection::connectDBus()
{
    QString address = getAccessibilityBusAddress();

    if (!address.isEmpty()) {
        QDBusConnection c = QDBusConnection::connectToBus(address, QStringLiteral("a11y"));
        if (c.isConnected()) {
            qDebug() << "Connected to accessibility bus at: " << address;
            return c;
        }
        qWarning("Found Accessibility DBus address but cannot connect. Falling back to session bus.");
    } else {
        qWarning("Accessibility DBus not found. Falling back to session bus.");
    }

    QDBusConnection c = QDBusConnection::sessionBus();
    if (!c.isConnected()) {
        qWarning("Could not connect to DBus.");
    }
    return QDBusConnection::sessionBus();
}

QString DBusConnection::getAccessibilityBusAddress() const
{
    QDBusConnection c = QDBusConnection::sessionBus();

    QDBusMessage m = QDBusMessage::createMethodCall(QLatin1String("org.a11y.Bus"),
                                                    QLatin1String("/org/a11y/bus"),
                                                    QLatin1String("org.a11y.Bus"), QLatin1String("GetAddress"));
    QDBusMessage reply = c.call(m);
    if (reply.type() == QDBusMessage::ErrorMessage) {
        qWarning() << "Qt at-spi: error getting the accessibility dbus address: " << reply.errorMessage();
        return QString();
    }

    QString busAddress = reply.arguments().at(0).toString();
    qDebug() << "Got bus address: " << busAddress;
    return busAddress;
}

/*!
  Returns the DBus connection that got established.
*/
QDBusConnection DBusConnection::connection() const
{
    return dbusConnection;
}

QT_END_NAMESPACE