/** LICENSE ********************************************************************
 **
 ** smolbote: yet another qute browser
 ** Copyright (C) 2017  Xian Nox
 **
 ** 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 3 of the License, or
 ** (at your option) any later version.
 **
 ** 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 "browser.h"
#include "mainwindow.h"
#include "settings.h"
#include <QtWebEngine>
#include <QMessageBox>

Browser::Browser(int &argc, char *argv[]) :
    QApplication(argc, argv)
{
    setApplicationName("smolbote");

    // This lets the web view automatically scale on high-dpi displays.
    setAttribute(Qt::AA_EnableHighDpiScaling);
}

Browser::~Browser()
{
    qDeleteAll(m_windows);
    m_windows.clear();

    delete m_bookmarksManager;
    delete m_downloadManager;
}

/*!
 * Check if the settings are empty
 */
void Browser::firstRun()
{
    Settings settings;
    if(settings.allKeys().isEmpty()) {
        // There are no keys in the settings
        QMessageBox::information(0,
                                 tr("Configuration is empty"),
                                 tr("The configuration file <i>%1</i> is empty. Using default values").arg(settings.staticFilePath()));
    }
}

/*!
 * Anything that needs to run after the QCommandLineParser but before showing a main window
 */
bool Browser::preLaunch(QStringList urls)
{
    Settings settings;

    if(settings.value("browser/singleInstance", true).toBool()) {
        QString serverName = settings.value("browser/localSocket", "smolbote-singlelock").toString();

        // Check for other running instance
        QLocalSocket socket;
        socket.connectToServer(serverName);
        if(socket.waitForConnected(500)) {
            QTextStream stream(&socket);
            stream << urls.join('|');
            stream.flush();
            socket.waitForBytesWritten();
            return false;
        }

        // There is no other instance
        m_localServer = new QLocalServer(this);
        connect(m_localServer, SIGNAL(newConnection()), this, SLOT(handleNewConnection()));
        if (!m_localServer->listen(serverName) && m_localServer->serverError() == QAbstractSocket::AddressInUseError) {
            // Could not create local server because the socket is already in use
            QLocalServer::removeServer(serverName);
            if (!m_localServer->listen(serverName)) {
                // Couldn't free the socket
                qWarning("Could not create local socket %s.", qPrintable(serverName));
            }
        } else {
            qDebug("Created local socket.");
        }
    }

    m_bookmarksManager = new BookmarksDialog;
    m_downloadManager = new DownloadDialog;

    QtWebEngine::initialize();

    return true;
}

Browser *Browser::instance()
{
    return static_cast<Browser *>(QCoreApplication::instance());
}

BookmarksDialog *Browser::bookmarks()
{
    return m_bookmarksManager;
}

DownloadDialog *Browser::downloads()
{
    return m_downloadManager;
}

void Browser::setConfigPath(const QString &path)
{
    if(path.isEmpty()) {
        // set default config path
        Settings::setFilePath(QStandardPaths::writableLocation(QStandardPaths::AppConfigLocation) + "/config.ini");
    } else {
        // set custom config path
        Settings::setFilePath(path);
    }
}

void Browser::addWindow(MainWindow *window)
{
    if(m_windows.contains(window)) {
        return;
    }

    m_windows.append(window);
    connect(window, &QObject::destroyed, [this, window]() {
        this->removeWindow(window);
    });

    window->show();
}

MainWindow *Browser::mainWindow()
{
    if(m_windows.isEmpty()) {
        addWindow(new MainWindow());
    }
    return m_windows.first();
}

void Browser::removeWindow(MainWindow *window)
{
    m_windows.removeOne(window);
}

void Browser::handleNewConnection()
{
    QLocalSocket *socket = m_localServer->nextPendingConnection();
    if(!socket) {
        // null socket -> return
        return;
    }

    socket->waitForReadyRead();
    QStringList urls = QString(socket->readAll()).split('|');
    delete socket;

    for(QString s : urls) {
        mainWindow()->addNewTab(QUrl::fromUserInput(s));
    }
}