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#include <QDir>
#include <QSettings>
#include <QLocale>
#include <QApplication>
#include <QProcess>

#include "xsession.h"

void XSession::init(const QString& name, const QString& exec,
                    const QString& comment, const QString& icon) {
    this->name_ = name;
    this->exec_ = exec;
    this->comment_ = comment;
    this->icon_ = icon;
}

bool XSession::init(const QString& filename) {
    QSettings settings(filename, QSettings::IniFormat);
    settings.setIniCodec("UTF-8");

    settings.beginGroup("Desktop Entry");

    if (settings.value("NoDisplay").toString().compare("true") == 0 ||
        settings.value("Hidden").toString().compare("true") == 0) {
        return false;
    }

    if (!settings.contains("Exec")) {
        return false;
    }
    QString exec(settings.value("Exec").toString());

    QString locale(QLocale::system().name());
    QString language(locale.split("_").at(0));
    QString name;
    if (settings.contains("Name[" + locale + "]")) {
        name = settings.value("Name[" + locale + "]").toString();
    } else if (settings.contains("Name[" + language + "]")) {
        name = settings.value("Name[" + language + "]").toString();
    } else if (settings.contains("Name")) {
        name = settings.value("Name").toString();
    } else {
        return false;
    }

    QString comment;
    if (settings.contains("Comment[" + locale + "]")) {
        comment = settings.value("Comment[" + locale + "]").toString();
    } else if (settings.contains("Comment[" + language + "]")) {
        comment = settings.value("Comment[" + language + "]").toString();
    } else {
        comment = settings.value("Comment").toString();
    }

    QString icon(settings.value("Icon").toString());
    if (QDir::isRelativePath(icon)) {
        // icons with relative paths are too complicated to find
        // see http://freedesktop.org/wiki/Specifications/icon-theme-spec
        // let's just ignore them
        icon = QString();
    }

    this->name_ = name;
    this->exec_ = exec;
    this->comment_ = comment;
    this->icon_ = icon;

    _process = new QProcess();

    return true;
}

bool XSession::isActive() const {
    return true;
}

bool XSession::isValid() const {
	return true;
}

bool XSession::isLocked() const {
    return false;
}

int XSession::priority() const {
    return 0;
}

QString XSession::icon() const {
    QString icon(this->icon_);

    if (icon.isEmpty()) {
        if (this->exec_.contains("kde", Qt::CaseInsensitive)) {
            icon = "kde";
        } else if (this->exec_.contains("gnome", Qt::CaseInsensitive)) {
            icon = "gnome";
        } else if (this->exec_.contains("term", Qt::CaseInsensitive)) {
            icon = "term";
        } else if (this->exec_.contains("xfce", Qt::CaseInsensitive)) {
            icon = "xfce";
        } else if (this->exec_.contains("lxde", Qt::CaseInsensitive)) {
            icon = "lxde";
        } else {
            icon = "linux";
        }
    }

    return icon;
}

bool XSession::run() const {
    _process->start(this->exec_);
    QObject::connect(_process, SIGNAL(finished(int, QProcess::ExitStatus)), QApplication::instance(), SLOT(quit()));
    if (_process->state() == QProcess::Starting || QProcess::Running)
        return true;
    else
        return false;
}

int XSession::type() const {
    return Session::XSESSION;
}

QList<Session*> XSession::readSessions(const QString& path) {
    QList<Session*> retval;
    foreach (QFileInfo fi, QDir(path).entryInfoList(QStringList("*.desktop"))) {
        if (fi.baseName().compare("default") == 0) {
            continue;
        }
        XSession* session = new XSession;
        if (session->init(fi.absoluteFilePath())) {
            retval.append(session);
        }
    }
    return retval;
}

bool XSession::operator<(const Session& other) const {
    int p0 = this->priority();
    int p1 = other.priority();

    if (p0 < p1) return true;
    if (p0 == p1) {
        QString d0 = this->shortDescription();
        QString d1 = other.shortDescription();
        return d0.localeAwareCompare(d1) < 0;
    }
    return false;
}