#include <QApplication>
#include <QCommandLineParser>
#include <QCommandLineOption>
#include <QSplashScreen>
#include <QTimer>
#include <QPalette>
#include <QProxyStyle>
#include <QStyleOption>
#include <QPainter>

#include "JFJochViewerWindow.h"
#include "RemoteDisplayMode.h"
#include "../writer/HDF5Objects.h"
#include "../common/GitInfo.h"

namespace {

// Fusion paints the dock resize handles in the window colour, which leaves them invisible against
// the salmon background (1.00:1) and impossible to find; a full-length coral band fixed that but
// dominated the view. So the separator keeps its 10 px grab area, is painted in the window colour,
// and is marked only by a short dark-amber pill (4.4:1 on salmon) at its midpoint, which takes the
// brand coral under the cursor.
class SeparatorHandleStyle final : public QProxyStyle {
public:
    explicit SeparatorHandleStyle(const QString &base) : QProxyStyle(base) {}

    int pixelMetric(PixelMetric m, const QStyleOption *opt, const QWidget *w) const override {
        if (m == PM_DockWidgetSeparatorExtent)
            return 10;
        return QProxyStyle::pixelMetric(m, opt, w);
    }

    void drawPrimitive(PrimitiveElement el, const QStyleOption *opt, QPainter *p,
                       const QWidget *w) const override {
        if (el != PE_IndicatorDockWidgetResizeHandle) {
            QProxyStyle::drawPrimitive(el, opt, p, w);
            return;
        }
        p->fillRect(opt->rect, opt->palette.window());
        const bool vertical = opt->rect.width() < opt->rect.height();
        const QColor pill_color = (opt->state & State_MouseOver) ? QColor(0xFA, 0x72, 0x68)
                                                                 : QColor(0xB4, 0x53, 0x09);
        constexpr qreal kLen = 56.0, kThick = 5.0;
        const QPointF c = QRectF(opt->rect).center();
        const QRectF pill = vertical ? QRectF(c.x() - kThick / 2, c.y() - kLen / 2, kThick, kLen)
                                     : QRectF(c.x() - kLen / 2, c.y() - kThick / 2, kLen, kThick);
        p->save();
        p->setRenderHint(QPainter::Antialiasing);
        // Cased in a near-white rim, like the spot markers: the bright seam lifts the grip off
        // the salmon band instead of letting the amber bleed into it.
        p->setPen(QPen(QColor(0xFF, 0xFC, 0xFA), 1));
        p->setBrush(pill_color);
        p->drawRoundedRect(pill, kThick / 2, kThick / 2);
        p->restore();
    }
};

} // namespace

int main(int argc, char *argv[]) {

    qRegisterMetaType<std::shared_ptr<const JFJochReaderDataset>>("std::shared_ptr<const JFJochReaderDataset>");
    qRegisterMetaType<std::shared_ptr<const JFJochReaderImage>>("std::shared_ptr<const JFJochReaderImage>");

    RegisterHDF5Filter();
    QApplication app(argc, argv);

    // Theme via the palette (robust across widgets): salmon panels, white entry fields that fall back
    // to salmon when disabled, and a navy accent for selections and progress-bar chunks.
    app.setStyle(new SeparatorHandleStyle("Fusion"));
    QPalette pal = app.palette();
    pal.setColor(QPalette::Window, QColor(255, 235, 230));
    pal.setColor(QPalette::Base, Qt::white);
    pal.setColor(QPalette::AlternateBase, QColor(255, 245, 242));
    pal.setColor(QPalette::Button, QColor(255, 235, 230));
    pal.setColor(QPalette::Disabled, QPalette::Base, QColor(255, 235, 230));
    pal.setColor(QPalette::Highlight, QColor(0x1f, 0x3a, 0x5f));
    pal.setColor(QPalette::HighlightedText, Qt::white);
    app.setPalette(pal);
    // Fusion fills QGroupBox interiors with a flat light colour; make them transparent so they show
    // the salmon window background like the rest of the UI (entry widgets stay white via the palette).
    // The dock resize handles are drawn by SeparatorHandleStyle above, not the stylesheet.
    app.setStyleSheet("QGroupBox { background-color: transparent; }");

    QIcon appIcon(":/jfjoch.png");
    app.setWindowIcon(appIcon);

    app.setApplicationName("JFJoch Viewer");
    app.setApplicationVersion(QString::fromStdString(jfjoch_version()));

    // Parse command line arguments
    QCommandLineParser parser;
    parser.setApplicationDescription("JFJoch Image Viewer");
    parser.addHelpOption();
    parser.addVersionOption();

    // Add --dbus option with a value option that defaults to true
    QCommandLineOption dbusOption(QStringList() << "d" << "dbus",
                                  "Enable or disable D-Bus interface (default: enabled)",
                                  "enable", "true");
    parser.addOption(dbusOption);

    // Process the actual command line arguments
    parser.process(app);

    if (RemoteDisplayMode())
        qInfo() << "Remote display session detected - repaints are throttled"
                   " (JFJOCH_VIEWER_REMOTE=0 or the View menu to override)";

    // Get any positional arguments (files to open)
    QString fileToOpen;
    QStringList positionalArgs = parser.positionalArguments();
    if (!positionalArgs.isEmpty()) {
        // Use the last argument as the file to open
        fileToOpen = positionalArgs.last();
    }

    // Check if D-Bus should be enabled or disabled
    bool enableDBus = true; // Default is enabled
    QString dbusValue = parser.value(dbusOption).toLower();

    if (dbusValue == "false" || dbusValue == "0" || dbusValue == "no" || dbusValue == "off") {
        enableDBus = false;
        qDebug() << "D-Bus interface disabled";
    } else {
        qDebug() << "D-Bus interface enabled";
    }

    // Create and show the main window with the appropriate settings
    JFJochViewerWindow mainWindow(nullptr, enableDBus, fileToOpen);

    mainWindow.show();

    QPixmap pixmap(":/jfjoch.png");
    QPixmap splash_pixmap(256+2*50, 256+50+50+30);
    splash_pixmap.fill(Qt::white);
    QPainter painter(&splash_pixmap);
    painter.drawPixmap(50, 50, pixmap);

    QSplashScreen *splash = new QSplashScreen(splash_pixmap);
    splash->setWindowFlags(Qt::WindowStaysOnTopHint | Qt::SplashScreen);
    QString version(QString::fromStdString(jfjoch_version()));
    splash->showMessage(
        "<b>Jungfrujoch image viewer</b><br/> Version " + version + "<br/>Paul Scherrer Institut",
        Qt::AlignBottom | Qt::AlignHCenter,
        Qt::black
    );

    splash->show();

    QTimer::singleShot(5000, splash, &QSplashScreen::close);
    return QApplication::exec();
}