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#include "desktopwindow.h"
#include "xdgdesktopfile.h"
#include <QAbstractScrollArea>

#define DESKTOP_DIR "/usr/share/applications"

#define ICON_SIZE 128
#define ITEM_SPACE ICON_SIZE / 2
#define FONT_SIZE ICON_SIZE / 6
DesktopWindow::DesktopWindow()
{
    QDesktopWidget *desktopwidget = QApplication::desktop();
    QRect desktoprect = desktopwidget->availableGeometry();
    qDebug() << "QLauncher available size :" << desktoprect.width() << "x" << desktoprect.height();

    QDir dir(DESKTOP_DIR);
    QStringList filters;
    filters << "*.desktop";
    dir.setNameFilters(filters);
    list = dir.entryInfoList();

    if (list.length()!=0) {
        QListWidget *desktopList = new QListWidget();
        for (int i = 0; i < list.size(); ++i) {
            XdgDesktopFile df;
            df.load(list.at(i).fileName());
            QListWidgetItem *item = new QListWidgetItem(df.icon(ICON_SIZE), df.name());
//            qDebug() << "QLauncher add application:" << i << df.name();
            QFont font;
            font.setPixelSize(FONT_SIZE);
            item->setFont(font);
            item->setSizeHint(QSize(ICON_SIZE + ITEM_SPACE, ICON_SIZE + FONT_SIZE + ITEM_SPACE));
            desktopList->addItem(item);
        }
        desktopList->setSpacing(ITEM_SPACE);
        desktopList->setViewMode(QListView::IconMode);
        desktopList->setFlow(QListView::LeftToRight);
        desktopList->setDragEnabled(false);
        desktopList->setWordWrap(true);
        desktopList->setWrapping(true);
        desktopList->setFrameShape(QListWidget::NoFrame);
        desktopList->setGridSize(QSize(ICON_SIZE + ITEM_SPACE, ICON_SIZE + ITEM_SPACE));
        desktopList->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
        desktopList->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
        desktopList->setStyleSheet("background-color:transparent");
        desktopList->setIconSize(QSize(ICON_SIZE, ICON_SIZE));
        desktopList->setResizeMode(QListWidget::Adjust);
        setCentralWidget(desktopList);
        setWindowState(Qt::WindowMaximized);
        setWindowFlags(Qt::FramelessWindowHint | Qt::WindowStaysOnBottomHint);
        setStyleSheet("QListWidget{background-color:transparent}");
        QProcess p;
        p.start("cat /etc/os-release");
        p.waitForStarted();
        p.waitForFinished();
        QTextStream tt(p.readAllStandardOutput());
        QString ll;
        bool found = 0;
        do{
            ll = tt.readLine();
//            qDebug() << ll;
            if(!ll.compare("NAME=\"Debian GNU/Linux\"")){
                found = true;
            }
        }while (! ll.isNull());
        if(found)
            setStyleSheet("QMainWindow{border-image: url(:/resources/background_debian.jpg);}");
        else
            setStyleSheet("QMainWindow{border-image: url(:/resources/background_linux.jpg);}");
        connect(desktopList, SIGNAL(itemPressed(QListWidgetItem *)), this, SLOT(on_itemClicked(QListWidgetItem *)));
    } else
        qDebug()<<"QLauncher no found .desktop file in"<<DESKTOP_DIR;
        resize(QGuiApplication::primaryScreen()->availableSize());
}

void DesktopWindow::on_itemClicked(QListWidgetItem * item)
{
    for (int i = 0; i < list.size(); ++i) {
        XdgDesktopFile df;
        df.load(list.at(i).fileName());
        if (df.name() == item->text()) {
            qDebug()<<"QLauncher start"<<df.name();
            df.startDetached();
        }
    }
}