/* Copyright (C) 2015 by ETH Zürich
 * Software engineering by Intevation GmbH
 *
 * This file is Free Software under the GNU GPL (v>=2)
 * and comes with ABSOLUTELY NO WARRANTY!
 * See LICENSE.txt for details.
 */

/** @file Main entry point for the application.
 *
 * This file is the wrapper around the qt application.
 * Does command line parsing and preparation of the QApplication.
 */
#include "constants.h"

#include "mainwindow.h"

#include "strhelp.h"
#include "util.h"

#include <QApplication>
#include <QCommandLineParser>
#include <QtPlugin>
#include <QDebug>
#include <QTranslator>
#include <QSettings>
#include <QFontDatabase>
#include <QSplashScreen>
#include <QTimer>

#ifdef Q_OS_WIN

 #include <windows.h>
 #include <shlobj.h>

 Q_IMPORT_PLUGIN(QWindowsIntegrationPlugin)
#else
/* this is only necessary if we build statically for GNU/Linux */
// Q_IMPORT_PLUGIN(QXcbIntegrationPlugin)
#endif

#ifdef IS_TAG_BUILD
bool g_debug = false;
#else
bool g_debug = true;
#endif

QtMessageHandler g_default_msg_handler = NULL;

void filterDebugOutput(QtMsgType type, const QMessageLogContext &context, const QString &msg)
{
    if (!g_debug && type == QtDebugMsg) {
        return;
    }

    if (g_default_msg_handler) {
        (*g_default_msg_handler)(type, context, msg);
    }
}

int realMain(int argc, char **argv);

#if defined(WIN32) && defined(UNICODE)

/** @brief Unicode entry point.
 *
 * Converts arguments to UTF-8 and executes the real
 * entry point realMain.
 */
int wmain(int argc, wchar_t **argv, wchar_t **envp)
{
    char **utf8args = NULL;

    utf8args = (char**) xmalloc0 ((argc + 1) * sizeof(char*));

    for (int i = 0; i < argc; i++) {
        utf8args[i] = wchar_to_utf8(argv[i], wcslen(argv[i]));
        if (utf8args[i] == NULL) {
            printf ("Fatal: could not convert arguments to UTF-8.\n");
            exit(-1);
        }
    }
    int ret = realMain(argc, utf8args);
    strv_free(utf8args);

    return ret;
}
#else
int main(int argc, char **argv)
{
    return realMain(argc, argv);
}
#endif

/** @brief The real entry point to the application.
 *
 * @param [in] argc the count of the arguments.
 * @param [in] argv On GNU/Linux this function expects argv to be in the
 * native system encoding. On Windows the arguments
 * shall be UTF-8
 *
 * @returns 0 on success an error code otherwise. */
int realMain(int argc, char **argv)
{
    /* QApplication setup */
    QApplication app (argc, argv);
    QApplication::setQuitOnLastWindowClosed(true);
    QApplication::setOrganizationName(QString::fromLatin1(APPNAME));
    QApplication::setApplicationName(QString::fromLatin1(APPNAME));
    QApplication::setApplicationVersion(QString::fromLatin1(VERSION));
    QSettings::setDefaultFormat(QSettings::IniFormat);

    /* Setup translations */
    QTranslator translator;
    if (QLocale::system().name() == "C") {
        /* Useful for testing / development as the primary target is german */
        translator.load(":/l10n/main_de_DE");
    } else {
        translator.load(":/l10n/main_" + QLocale::system().name());
    }
    app.installTranslator(&translator);

    /* Install static fonts */

    /* The putenv here works around a bug in qt (#29192). Qt thinks it is a fatal
     * error if the font directory does not exist. Will be fixed in Qt 5.4 */
    char * inst_dir = get_install_dir();
    if (inst_dir) {
        qputenv("QT_QPA_FONTDIR", inst_dir);
        xfree(inst_dir);
    }
    int fontId = QFontDatabase::addApplicationFont(":/fonts/DejaVuSans.ttf");
    if (fontId != -1)
    {
        QFont font("DejaVuSans");
        font.setPointSize(9);
        app.setFont(font);
    }

    /* Parse the command line */
    QCommandLineParser parser;
    parser.setApplicationDescription(QObject::tr(DESCRIPTION) + "\n" +
                                     QObject::tr(COPYRIGHT));
    parser.addHelpOption();

    parser.addPositionalArgument("folder", QCoreApplication::translate("main", "The folder containing the data to replay."));
    QCommandLineOption debugOpt(QStringList() << "debug",
            QCoreApplication::translate("main", "Print debug output."));
    parser.addOption(debugOpt);

    parser.process(app);

#ifdef IS_TAG_BUILD
    g_debug = parser.isSet(debugOpt);
#else
    g_debug = true;
#endif
    g_default_msg_handler = qInstallMessageHandler(filterDebugOutput);


    /* Initialize the main window */
    MainWindow mainWin;

    const QStringList args = parser.positionalArguments();
    if (args.size() > 1) {
        parser.showHelp(1);
    }
    if (args.size() == 1) {
        mainWin.setFolder(args.first());
    } else {
        mainWin.showWithFolderSelect();
    }

    return app.exec(); /* Go event loop */
}