#include "mainwindow.h"
#include <QScrollArea>
#include <QDir>
#include <QKeyEvent>
#include <QMenu>
#include <QMenuBar>
#include <QFileDialog>
#include <QStandardPaths>
#include <QMessageBox>
#include <QProgressDialog>
#include <QDebug>
#include <sys/ioctl.h>
#include <linux/btrfs.h>
#include <signal.h>
#include <unistd.h>
#include <sys/socket.h>

int MainWindow::socketPair[2] = {0, 0};

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent),
  loading(false),
  queued(0)
{
    m_image = new ImageScrollArea(this);
    setCentralWidget(m_image);
    resize(800, 600);

    setWindowTitle(tr("Image Selector"));

    m_ringList = new ImageRingList(this);
    connect(m_ringList, SIGNAL(pixmapLoaded(QPixmap)), this, SLOT(pixmapLoaded(QPixmap)));
    connect(m_ringList, SIGNAL(currentImageChanged()), this, SLOT(updateWindowTitle()));

    QMenu *fileMenu = new QMenu(tr("File"), this);
    fileMenu->addAction(tr("Open"), this, SLOT(openFile()), QKeySequence("Ctrl+O"));
    fileMenu->addAction(tr("Copy marked files"), this, SLOT(copyMarked()));
    QAction *liveModeAction = fileMenu->addAction(tr("Live mode"), this, SLOT(liveMode(bool)));
    liveModeAction->setCheckable(true);
    fileMenu->addAction(tr("Exit"), this, SLOT(close()));
    menuBar()->addMenu(fileMenu);

    QMenu *viewMenu = new QMenu(tr("View"), this);
    viewMenu->addAction(tr("Zoom In"), m_image, SLOT(zoomIn()), QKeySequence::ZoomIn);
    viewMenu->addAction(tr("Zoom Out"), m_image, SLOT(zoomOut()), QKeySequence::ZoomOut);
    viewMenu->addAction(tr("Best Fit"), m_image, SLOT(bestFit()), QKeySequence("Ctrl+1"));
    viewMenu->addAction(tr("100%"), m_image, SLOT(oneToOne()));
    menuBar()->addMenu(viewMenu);

    QMenu *selectMenu = new QMenu(tr("Select"), this);
    selectMenu->addAction(tr("Mark"), this, SLOT(markImage()), Qt::Key_F5);
    selectMenu->addAction(tr("Unmark"), this, SLOT(unmarkImage()), Qt::Key_F8);
    selectMenu->addSeparator();
    selectMenu->addAction(tr("Mark and next"), this, SLOT(markAndNext()), Qt::Key_M);
    selectMenu->addAction(tr("Unmark and next"), this, SLOT(unmarkAndNext()), Qt::Key_X);
    menuBar()->addMenu(selectMenu);

    m_database = new Database(this);
    if(!m_database->init())
        QMessageBox::critical(this, tr("Can't open DB"), tr("Can't open SQLITE database"));

    setupSigterm();
}

MainWindow::~MainWindow()
{
}

void MainWindow::keyPressEvent(QKeyEvent *event)
{
    if(!loading)
    {
        switch (event->key())
        {
        case Qt::Key_Left:
            m_ringList->decrement();
            break;
        case Qt::Key_Right:
            m_ringList->increment();
            break;
        default:
            event->ignore();
            break;
        }
    }
    else
    {
        event->ignore();
    }

    if(event->isAccepted())
        updateWindowTitle();
}

void MainWindow::keyReleaseEvent(QKeyEvent *event)
{
    event->ignore();
}

void MainWindow::setupSigterm()
{
    struct sigaction signal;

    signal.sa_handler = MainWindow::signalHandler;
    sigemptyset(&signal.sa_mask);
    signal.sa_flags = 0;
    signal.sa_flags |= SA_RESTART;

    sigaction(SIGHUP, &signal, 0);
    sigaction(SIGTERM, &signal, 0);
    sigaction(SIGINT, &signal, 0);

    ::socketpair(AF_UNIX, SOCK_STREAM, 0, socketPair);
    socketNotifier = new QSocketNotifier(socketPair[1], QSocketNotifier::Read, this);
    connect(socketNotifier, SIGNAL(activated(int)), this, SLOT(socketNotify()));
}

void MainWindow::signalHandler(int)
{
    char a = 1;
    ::write(socketPair[0], &a, sizeof(a));
}

void MainWindow::socketNotify()
{
    socketNotifier->setEnabled(false);
    char tmp;
    read(socketPair[1], &tmp, sizeof(tmp));
    close();
    socketNotifier->setEnabled(true);
}

void MainWindow::pixmapLoaded(QPixmap pix)
{
    m_image->setImage(pix);
}

void MainWindow::openFile()
{
    QStringList standardLocations = QStandardPaths::standardLocations(QStandardPaths::PicturesLocation);
    QString path;
    if(standardLocations.size())
        path = standardLocations.first();

    QString file = QFileDialog::getOpenFileName(this, tr("Open file"), path, tr("Images (*.jpg *.png *.cr2 *.JPG *.PNG *.CR2)"));
    if(!file.isEmpty())
    {
        QFileInfo info(file);
        m_ringList->setFile(info.canonicalFilePath());
        updateWindowTitle();
    }
}

void MainWindow::markImage()
{
    ImagePtr ptr = m_ringList->currentImage();
    if(ptr)
    {
        QString file = ptr->name();
        if(!file.isEmpty())
            m_database->mark(file);

        updateWindowTitle();
    }
}

void MainWindow::unmarkImage()
{
    ImagePtr ptr = m_ringList->currentImage();
    if(ptr)
    {
        QString file = ptr->name();
        if(!file.isEmpty())
            m_database->unmark(file);

        updateWindowTitle();
    }
}

void MainWindow::markAndNext()
{
    markImage();
    m_ringList->increment();
    updateWindowTitle();
}

void MainWindow::unmarkAndNext()
{
    unmarkImage();
    m_ringList->increment();
    updateWindowTitle();
}

void MainWindow::copyMarked()
{
    QString dest = QFileDialog::getExistingDirectory(this, tr("Select destination"));
    QDir dir(dest);
    if(!dest.isEmpty() && dir.exists())
    {
        int i = 0;
        QStringList files = m_database->getMarkedFiles();
        QProgressDialog progress(tr("Copying"), tr("Cancel"), 0, files.size(), this);
        progress.setWindowModality(Qt::WindowModal);
        progress.show();
        foreach(const QString &file, files)
        {
            QFileInfo info(file);
            QFile srcFile(file);
            QFile dstFile(dir.absoluteFilePath(info.fileName()));

            if(dstFile.exists())
                continue;

            if(progress.wasCanceled())
                break;

            srcFile.open(QIODevice::ReadOnly);
            dstFile.open(QIODevice::WriteOnly);
            if(ioctl(dstFile.handle(), BTRFS_IOC_CLONE, srcFile.handle()) < 0)
            {
                dstFile.remove();
                dstFile.close();
                qDebug() << dstFile.fileName();
                srcFile.copy(dstFile.fileName());
            }
            progress.setValue(i++);
        }
    }
}

void MainWindow::liveMode(bool active)
{
    m_ringList->setLiveMode(active);
}

void MainWindow::updateWindowTitle()
{
    ImagePtr ptr = m_ringList->currentImage();
    if(ptr)
    {
        QFileInfo info(ptr->name());
        QString title = info.fileName();
        if(m_database->isMarked(ptr->name()))
                title += " *";
        setWindowTitle(title);
    }
}