/*
 *  Copyright (C) 2010 Felix Geyer <debfx@fobos.de>
 *  Copyright (C) 2017 KeePassXC Team <team@keepassxc.org>
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 2 or (at your option)
 *  version 3 of the License.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <QCommandLineParser>
#include <QFile>
#include <QTextStream>

#include "cli/Utils.h"
#include "config-keepassx.h"
#include "core/Bootstrap.h"
#include "core/Config.h"
#include "core/Tools.h"
#include "crypto/Crypto.h"
#include "gui/Application.h"
#include "gui/MainWindow.h"
#include "gui/MessageBox.h"

#if defined(WITH_ASAN) && defined(WITH_LSAN)
#include <sanitizer/lsan_interface.h>
#endif

#ifdef QT_STATIC
#include <QtPlugin>

#if defined(Q_OS_WIN)
Q_IMPORT_PLUGIN(QWindowsIntegrationPlugin)
#elif defined(Q_OS_UNIX) && !defined(Q_OS_MACOS)
Q_IMPORT_PLUGIN(QXcbIntegrationPlugin)
#endif
#endif

int main(int argc, char** argv)
{
    QT_REQUIRE_VERSION(argc, argv, QT_VERSION_STR)

#if QT_VERSION >= QT_VERSION_CHECK(5, 6, 0)
    QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
#endif
#ifdef Q_OS_LINUX
    if (qgetenv("XDG_SESSION_TYPE") == QByteArrayLiteral("wayland")) {
        qWarning() << "Warning: disregarding XDG_SESSION_TYPE=wayland";
        qWarning() << "To use wayland anyway, please set QT_QPA_PLATFORM=wayland";
        qunsetenv("XDG_SESSION_TYPE");
    }
#endif

    Application app(argc, argv);
    Application::setApplicationName("keepassxc");
    Application::setApplicationVersion(KEEPASSXC_VERSION);
    // don't set organizationName as that changes the return value of
    // QStandardPaths::writableLocation(QDesktopServices::DataLocation)
    Bootstrap::bootstrapApplication();

    QCommandLineParser parser;
    parser.setApplicationDescription(QObject::tr("KeePassXC - cross-platform password manager"));
    parser.addPositionalArgument(
        "filename", QObject::tr("filenames of the password databases to open (*.kdbx)"), "[filename(s)]");

    QCommandLineOption configOption("config", QObject::tr("path to a custom config file"), "config");
    QCommandLineOption keyfileOption("keyfile", QObject::tr("key file of the database"), "keyfile");
    QCommandLineOption pwstdinOption("pw-stdin", QObject::tr("read password of the database from stdin"));
    // This is needed under Windows where clients send --parent-window parameter with Native Messaging connect method
    QCommandLineOption parentWindowOption(QStringList() << "pw"
                                                        << "parent-window",
                                          QObject::tr("Parent window handle"),
                                          "handle");

    QCommandLineOption helpOption = parser.addHelpOption();
    QCommandLineOption versionOption = parser.addVersionOption();
    QCommandLineOption debugInfoOption(QStringList() << "debug-info",
                                       QObject::tr("Displays debugging information."));
    parser.addOption(configOption);
    parser.addOption(keyfileOption);
    parser.addOption(pwstdinOption);
    parser.addOption(parentWindowOption);
    parser.addOption(debugInfoOption);

    parser.process(app);

    // Don't try and do anything with the application if we're only showing the help / version
    if (parser.isSet(versionOption) || parser.isSet(helpOption)) {
        return EXIT_SUCCESS;
    }

    const QStringList fileNames = parser.positionalArguments();

    if (app.isAlreadyRunning()) {
        if (!fileNames.isEmpty()) {
            app.sendFileNamesToRunningInstance(fileNames);
        }
        qWarning() << QObject::tr("Another instance of KeePassXC is already running.").toUtf8().constData();
        return EXIT_SUCCESS;
    }

    QApplication::setQuitOnLastWindowClosed(false);

    if (!Crypto::init()) {
        QString error = QObject::tr("Fatal error while testing the cryptographic functions.");
        error.append("\n");
        error.append(Crypto::errorString());
        MessageBox::critical(nullptr, QObject::tr("KeePassXC - Error"), error);
        return EXIT_FAILURE;
    }

    // Displaying the debugging informations must be done after Crypto::init,
    // to make sure we know which libgcrypt version is used.
    if (parser.isSet(debugInfoOption)) {
        QTextStream out(stdout, QIODevice::WriteOnly);
        QString debugInfo = Tools::debugInfo().append("\n").append(Crypto::debugInfo());
        out << debugInfo << endl;
        return EXIT_SUCCESS;
    }

    if (parser.isSet(configOption)) {
        Config::createConfigFromFile(parser.value(configOption));
    }

    MainWindow mainWindow;
    QObject::connect(&app, SIGNAL(anotherInstanceStarted()), &mainWindow, SLOT(bringToFront()));
    QObject::connect(&app, SIGNAL(applicationActivated()), &mainWindow, SLOT(bringToFront()));
    QObject::connect(&app, SIGNAL(openFile(QString)), &mainWindow, SLOT(openDatabase(QString)));
    QObject::connect(&app, SIGNAL(quitSignalReceived()), &mainWindow, SLOT(appExit()), Qt::DirectConnection);

    Bootstrap::restoreMainWindowState(mainWindow);

    const bool pwstdin = parser.isSet(pwstdinOption);
    for (const QString& filename : fileNames) {
        QString password;
        if (pwstdin) {
            // we always need consume a line of STDIN if --pw-stdin is set to clear out the
            // buffer for native messaging, even if the specified file does not exist
            QTextStream out(stdout, QIODevice::WriteOnly);
            out << QObject::tr("Database password: ") << flush;
            password = Utils::getPassword();
        }

        if (!filename.isEmpty() && QFile::exists(filename) && !filename.endsWith(".json", Qt::CaseInsensitive)) {
            mainWindow.openDatabase(filename, password, parser.value(keyfileOption));
        }
    }

    int exitCode = Application::exec();

#if defined(WITH_ASAN) && defined(WITH_LSAN)
    // do leak check here to prevent massive tail of end-of-process leak errors from third-party libraries
    __lsan_do_leak_check();
    __lsan_disable();
#endif

    return exitCode;
}