#include "mainwindow.h"
#include "stretchpanel.h"
#include <QScrollArea>
#include <QDir>
#include <QKeyEvent>
#include <QMenu>
#include <QMenuBar>
#include <QFileDialog>
#include <QStandardPaths>
#include <QMessageBox>
#include <QProgressDialog>
#include <QDebug>
#include <QDockWidget>
#include <signal.h>
#include <unistd.h>
#include "photocapture.h"

#ifdef __linux__
#include <sys/ioctl.h>
#include <linux/btrfs.h>
#include <sys/socket.h>
#include <QSettings>
#endif

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

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
{
    qRegisterMetaType<ImageInfoData>("ImageInfoData");
    qRegisterMetaType<RawImageAbs*>("RawImageAbs");

    m_info = new ImageInfo(this);
    QDockWidget *infoDock = new QDockWidget(tr("Image info"), this);
    infoDock->setWidget(m_info);
    infoDock->setObjectName("infoDock");
    addDockWidget(Qt::LeftDockWidgetArea, infoDock);
    m_image = new ImageScrollArea(this);
    m_image->resize(0,0);
    //setCentralWidget(m_image);
    resize(800, 600);

    m_imageGL = new ImageScrollAreaGL(this);
    setCentralWidget(m_imageGL);

    PhotoCapture *photoCapture = new PhotoCapture(this);
    QDockWidget *captureDock = new QDockWidget(tr("Photo capture"), this);
    captureDock->setWidget(photoCapture);
    captureDock->setObjectName("captureDock");
    addDockWidget(Qt::BottomDockWidgetArea, captureDock);

    StretchPanel *stretchPanel = new  StretchPanel(this);
    connect(stretchPanel, SIGNAL(lowChanged(int)), m_imageGL, SLOT(setLow(int)));
    connect(stretchPanel, SIGNAL(highChanged(int)), m_imageGL, SLOT(setHigh(int)));

    QDockWidget *stretchDock = new QDockWidget(tr("Stretch"), this);
    stretchDock->setWidget(stretchPanel);
    stretchDock->setObjectName("strechDock");
    addDockWidget(Qt::LeftDockWidgetArea, stretchDock);

    setWindowTitle(tr("Tenmon"));

    m_ringList = new ImageRingList(this);
    connect(m_ringList, SIGNAL(pixmapLoaded(Image*)), this, SLOT(pixmapLoaded(Image*)));
    connect(m_ringList, SIGNAL(currentImageChanged()), this, SLOT(updateWindowTitle()));
    connect(m_ringList, SIGNAL(infoLoaded(ImageInfoData)), m_info, SLOT(setInfo(ImageInfoData)));

    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);

    QMenu *analyzeMenu = new QMenu(tr("Analyze"), this);
    QActionGroup *analyzeGroup = new QActionGroup(this);
    connect(analyzeGroup, &QActionGroup::triggered, [](QAction* action) {
        static QAction* lastAction = nullptr;
        if(action == lastAction)
        {
            action->setChecked(false);
            lastAction = nullptr;
        }
        else
            lastAction = action;
        });

    QAction *statsAction = analyzeGroup->addAction(tr("Image statistics"));
    QAction *peakAction = analyzeGroup->addAction(tr("Peak finder"));
    QAction *starAction = analyzeGroup->addAction("Star finder");
    statsAction->setCheckable(true);
    peakAction->setCheckable(true);
    starAction->setCheckable(true);
    connect(statsAction, SIGNAL(toggled(bool)), this, SLOT(imageStats(bool)));
    connect(peakAction, SIGNAL(toggled(bool)), this, SLOT(peakFinder(bool)));
    connect(starAction, SIGNAL(toggled(bool)), this, SLOT(starFinder(bool)));
    analyzeMenu->addActions({statsAction, peakAction, starAction});
    menuBar()->addMenu(analyzeMenu);

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

    QMenu *dockMenu = new QMenu(tr("Docks"), this);
    dockMenu->addAction(infoDock->toggleViewAction());
    dockMenu->addAction(captureDock->toggleViewAction());
    dockMenu->addAction(stretchDock->toggleViewAction());
    menuBar()->addMenu(dockMenu);

    setupSigterm();
    QSettings settings;
    restoreGeometry(settings.value("mainwindow/geometry").toByteArray());
    restoreState(settings.value("mainwindow/state").toByteArray());

    QStringList standardLocations = QStandardPaths::standardLocations(QStandardPaths::PicturesLocation);
    if(standardLocations.size())
        _lastDir = standardLocations.first();
}

MainWindow::~MainWindow()
{
}

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

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

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

void MainWindow::setupSigterm()
{
#ifdef __linux__
    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()));
#endif
}

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

void MainWindow::closeEvent(QCloseEvent *event)
{
    QSettings settings;
    settings.setValue("mainwindow/geometry", saveGeometry());
    settings.setValue("mainwindow/state", saveState());
    QMainWindow::closeEvent(event);
}

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

void MainWindow::pixmapLoaded(Image *image)
{
    m_image->setImage(image->pixmap());
    m_imageGL->setImage(image->rawImage());
}

void MainWindow::openFile()
{
    QString file = QFileDialog::getOpenFileName(this, tr("Open file"), _lastDir, tr("Images (*.jpg *.png *.cr2 *.fit *.fits *.JPG *.PNG *.CR2 *.FIT *.FITS)"));
    if(!file.isEmpty())
    {
        QFileInfo info(file);
        m_ringList->setFile(info.canonicalFilePath());
        updateWindowTitle();
        _lastDir = QFileInfo(file).absoluteDir().absolutePath();
    }
}

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;
#ifdef __linux__
            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());
            }
#else
            srcFile.copy(dstFile.fileName());
#endif
            progress.setValue(i++);
        }
    }
}

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

void MainWindow::imageStats(bool imageStats)
{
    m_ringList->setCalculateStats(imageStats);
}

void MainWindow::peakFinder(bool findPeaks)
{
    m_ringList->setFindPeaks(findPeaks);
}

void MainWindow::starFinder(bool findStars)
{
    m_ringList->setFindStars(findStars);
}

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);
    }
}