/*******************************************************************************
 **
 ** 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 <QtWebEngine>
#include <QMessageBox>

#include <QDir>
#include <QPluginLoader>
#include "interfaces.h"

Browser::Browser(int &argc, char *argv[]) :
    SingleApplication(argc, argv)
{
    m_settings = nullptr;

    m_networkAccessManager = nullptr;
    m_urlRequestInterceptor = nullptr;
    m_bookmarksManager = nullptr;
    m_downloadManager = nullptr;
    m_blocklistManager = nullptr;

    m_plugin = nullptr;
}

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

    if(m_networkAccessManager) {
        delete m_networkAccessManager;
    }

    if(m_bookmarksManager) {
        delete m_bookmarksManager;
    }

    if(m_downloadManager) {
        delete m_downloadManager;
    }
}

QString Browser::applicationLongVersion() const
{
#ifdef GIT_DESCRIBE
    return QString(GIT_DESCRIBE);
#else
    return applicationVersion();
#endif
}

void Browser::loadPlugins()
{
    // Loading plugins
    qDebug(">> Looking for plugins...");

    // Look for plugins in "../lib/smolbote/plugins"
    QDir dir = QDir::current();
    dir.cd("../lib/smolbote/plugins");

    // Load all plugins
    for(QString filename : dir.entryList(QDir::Files | QDir::Readable)) {
        qDebug("Loading %s", qUtf8Printable(filename));

        QPluginLoader loader(dir.absoluteFilePath(filename));
        QObject *plugin = loader.instance();
        if(plugin) {
            PluginInterface *p = qobject_cast<PluginInterface *>(plugin);
            if(p) {
                qDebug("Successfully loaded plugin [name = %s]", qUtf8Printable(p->name()));
                m_plugin = plugin;
            }
        } else {
            qDebug("Plugin load failed");
        }
    }

    qDebug("<< Plugins end...");
}

void Browser::loadProfiles()
{
    qDebug(">> Looking for profiles...");
    profile("");
    QDir dir(settings()->value("browser.profile.path").toString());
    for(const QString name : dir.entryList(QDir::Dirs | QDir::NoDotAndDotDot)) {
        qDebug("- Adding profile %s", qUtf8Printable(name));
        profile(name);
    }
    qDebug("<< Profiles end...");

    connect(this, SIGNAL(messageAvailable(QStringList)), this, SLOT(addWindow(QStringList)));
}

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

Settings *Browser::settings()
{
    return m_settings;
}

QNetworkAccessManager *Browser::network()
{
    if(!m_networkAccessManager) {
        m_networkAccessManager = new QNetworkAccessManager();
    }
    return m_networkAccessManager;
}

BookmarksWidget *Browser::bookmarks()
{
    if(!m_bookmarksManager) {
        m_bookmarksManager = new BookmarksWidget(settings()->value("bookmarks.path").toString());
    }
    return m_bookmarksManager;
}

DownloadsWidget *Browser::downloads()
{
    if(!m_downloadManager) {
        m_downloadManager = new DownloadsWidget();
    }
    return m_downloadManager;
}

BlockerManager *Browser::blocklists()
{
    if(!m_blocklistManager) {
        m_blocklistManager = new BlockerManager();
    }
    return m_blocklistManager;
}

void Browser::loadSettings(const QString &path)
{
    QString configLocation, defaultsLocation;

    // set custom config path if any
    if(!path.isEmpty()) {
        configLocation = path;

    } else {
        // no custom config has been set
        // check if config file exists for this user
        QString cpath = QStandardPaths::writableLocation(QStandardPaths::AppConfigLocation) + "/poi.conf";
        if(QFile::exists(cpath)) {
            configLocation = cpath;
        }
        // else there is no user overrides
    }

    // set defaults location
    // check system-specific locations
#ifdef Q_OS_LINUX
    if(QFile::exists("/usr/share/smolbote/poi.conf")) {
        defaultsLocation = "/usr/share/smolbote/poi.conf";
    } else if(QFile::exists("/usr/local/share/smolbote/poi.conf")) {
        defaultsLocation = "/usr/local/share/smolbote/poi.conf";
    }
#endif

    // if no default config is found, then use the built-in one
    if(defaultsLocation.isEmpty()) {
        defaultsLocation = ":/poi.toml";
    }

    m_settings = new Settings(configLocation, defaultsLocation);

#ifdef QT_DEBUG
    if(m_settings->isEmpty()) {
        // There are no keys in the settings
        QMessageBox::information(0,
                                 tr("Configuration is empty"),
                                 tr("The configuration file <i>%1</i> is empty.<br>"
                                    "Using default values from <i>%2</i>.").arg(configLocation, defaultsLocation));
    }
#endif
}

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

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();
}

void Browser::addWindow(const QStringList params)
{
    QString p; // get default profile
    QStringList urls;

    for(int i = 0; i < params.length(); i++) {
        if(params.at(i) == "-p" || params.at(i) == "--profile") {
            i++;
            p = params.at(i);
        } else if(!params.at(i).startsWith('-') && i > 0) {
            qDebug("Appending url: %s", qUtf8Printable(params.at(i)));
            urls.append(params.at(i));
        }
    }

    MainWindow *w = new MainWindow(urls);
    w->setProfile(profile(p));

    addWindow(w);
}

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

WebEngineProfile* Browser::profile(const QString name)
{
    if(!m_profiles.contains(name)) {
        if(name.isEmpty()) {
            // Create off-the-record profile
            m_profiles.insert(name, new WebEngineProfile(this));
        } else {
            // Create regular profile
            m_profiles.insert(name, new WebEngineProfile(name, this));
        }

        if(!m_urlRequestInterceptor) {
            m_urlRequestInterceptor = new UrlRequestInterceptor(this);
            m_urlRequestInterceptor->setSubscription(blocklists());
        }

        m_profiles[name]->setRequestInterceptor(m_urlRequestInterceptor);

        connect(m_profiles[name], SIGNAL(downloadRequested(QWebEngineDownloadItem*)), downloads(), SLOT(addDownload(QWebEngineDownloadItem*)));
    }

    return m_profiles[name];
}

QStringList Browser::profiles()
{
    QStringList l;
    for(QString key : m_profiles.keys()) {
        l.append(key);
    }
    return l;
}

QObject *Browser::plugin(const QString name)
{
    return m_plugin;
}