#include <QtQml/QQmlApplicationEngine>
#include <QtGui/QGuiApplication>

#include <QQmlContext>
#include <QStringList>

#include <QtWidgets/QApplication>
#include <QIcon>

#include <QDebug>
#include <stdlib.h>

#include <fileio.h>

QString getNamedArgument(QStringList args, QString name, QString defaultName)
{
    int index = args.indexOf(name);
    return (index != -1) ? args[index + 1] : QString(defaultName);
}

QString getNamedArgument(QStringList args, QString name)
{
    return getNamedArgument(args, name, "");
}

int main(int argc, char *argv[])
{
    // Some environmental variable are necessary on certain platforms.

    // This disables QT appmenu under Ubuntu, which is not working with QML apps.
    setenv("QT_QPA_PLATFORMTHEME", "", 1);

#if defined(Q_OS_MAC)
    // This allows UTF-8 characters usage in OSX.
    setenv("LC_CTYPE", "UTF-8", 1);
#endif

    QApplication app(argc, argv);
    QQmlApplicationEngine engine;
    FileIO fileIO;

#if !defined(Q_OS_MAC)
    app.setWindowIcon(QIcon::fromTheme("cool-retro-term", QIcon(":../icons/32x32/cool-retro-term.png")));
#else
    app.setWindowIcon(QIcon(":../icons/32x32/cool-retro-term.png"));
#endif

    // Manage command line arguments from the cpp side
    QStringList args = app.arguments();
    if (args.contains("-h") || args.contains("--help")) {
        // BUG: This usage help text goes to stderr, should go to stdout.
        // BUG: First line of output is surrounded by double quotes.
        qDebug() << "Usage: " + args.at(0) + " [--default-settings] [--workdir <dir>] [--program <prog>] [-p|--profile <prof>] [--fullscreen] [-h|--help]";
        qDebug() << "  --default-settings  Run cool-retro-term with the default settings";
        qDebug() << "  --workdir <dir>     Change working directory to 'dir'";
        qDebug() << "  -e <cmd>            Command to execute. This option will catch all following arguments, so use it as the last option.";
        qDebug() << "  --fullscreen        Run cool-retro-term in fullscreen.";
        qDebug() << "  -p|--profile <prof> Run cool-retro-term with the given profile.";
        qDebug() << "  -h|--help           Print this help.";
        qDebug() << "  --verbose           Print additional information such as profiles and settings.";
        return 0;
    }

    if (args.contains("-v") || args.contains("--version")) {
        qDebug() << "cool-retro-term 1.0.1";
	return 0;
    }

    // Manage default command
    QStringList cmdList;
    if (args.contains("-e")) {
        cmdList << args.mid(args.indexOf("-e") + 1);
    }
    QVariant command(cmdList.empty() ? QVariant() : cmdList[0]);
    QVariant commandArgs(cmdList.size() <= 1 ? QVariant() : QVariant(cmdList.mid(1)));
    engine.rootContext()->setContextProperty("defaultCmd", command);
    engine.rootContext()->setContextProperty("defaultCmdArgs", commandArgs);

    engine.rootContext()->setContextProperty("workdir", getNamedArgument(args, "--workdir", "$HOME"));
    engine.rootContext()->setContextProperty("fileIO", &fileIO);

    engine.rootContext()->setContextProperty("devicePixelRatio", app.devicePixelRatio());

    // Manage import paths for Linux and OSX.
    QStringList importPathList = engine.importPathList();
    importPathList.prepend(QCoreApplication::applicationDirPath() + "/qmltermwidget");
    importPathList.prepend(QCoreApplication::applicationDirPath() + "/../PlugIns");
    importPathList.prepend(QCoreApplication::applicationDirPath() + "/../../../qmltermwidget");
    engine.setImportPathList(importPathList);

    engine.load(QUrl(QStringLiteral ("qrc:/main.qml")));

    if (engine.rootObjects().isEmpty()) {
        qDebug() << "Cannot load QML interface";
        return EXIT_FAILURE;
    }

    // Quit the application when the engine closes.
    QObject::connect((QObject*) &engine, SIGNAL(quit()), (QObject*) &app, SLOT(quit()));

    return app.exec();
}
