/*******************************************************************************
 **
 ** 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)
{
    setApplicationName("smolbote");
#ifdef GIT_VERSION
    setApplicationVersion(GIT_VERSION);
#else
    setApplicationVersion("1.0.0");
#endif
}

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

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
    const QStringList files = dir.entryList(QDir::Files | QDir::Readable);
    for(const QString &filename : files) {
        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());
    const QStringList profileList = dir.entryList(QDir::Dirs | QDir::NoDotAndDotDot);
    for(const QString &name : profileList) {
        qDebug("- Adding profile %s", qUtf8Printable(name));
        profile(name);
    }
    qDebug("<< Profiles end...");

    //connect(this, SIGNAL(messageAvailable(QStringList)), this, SLOT(addWindow(QStringList)));
    connect(this, &Browser::messageAvailable, this, [&](const QHash<QString, QVariant> params) {

        //qDebug("Creating new window for [%s]", qUtf8Printable(params["urls"].toString()));

        createWindow(params);
    });
}

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

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

BookmarksWidget *Browser::bookmarks()
{
    if(!m_bookmarksManager) {
        m_bookmarksManager = QSharedPointer<BookmarksWidget>(new BookmarksWidget(settings()->value("bookmarks.path").toString()), &QObject::deleteLater);
    }
    return m_bookmarksManager.data();
}

DownloadsWidget *Browser::downloads()
{
    if(!m_downloadManager) {
        m_downloadManager = QSharedPointer<DownloadsWidget>(new DownloadsWidget(settings()->value("downloads.path").toString()), &QObject::deleteLater);
    }
    return m_downloadManager.data();
}

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 = std::unique_ptr<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::activeWindow()
{
    if(m_windows.empty()) {
        return nullptr;
    }

    for(auto it = m_windows.cbegin(); it != m_windows.cend(); it++) {
        if(it->data()->isActiveWindow()) {
            return it->data();
        }
    }
    return m_windows.first().data();
}

MainWindow *Browser::createWindow(const QHash<QString, QVariant> options)
{
    Q_ASSERT(options.contains("urls"));

    MainWindow *w = new MainWindow();

    m_windows.append(QPointer<MainWindow>(w));
    connect(w, &MainWindow::destroyed, this, [&]() {
        clean();
    });

    QString profileName;
    if(options.contains("profile")) {
        profileName = options.value("profile").toString();
    }
    const QStringList urls = options.value("urls").toStringList();
    if(urls.isEmpty()) {
        w->newTab(profile(profileName)->homepage());
    } else {
        for(const QString url : urls) {
            w->newTab(QUrl::fromUserInput(url));
        }
    }

    w->show();

    return w;
}

void Browser::clean()
{
    for(int i = m_windows.count() - 1; i >= 0; i--) {
        if(m_windows[i].isNull()) {
            m_windows.removeAt(i);
#ifdef QT_DEBUG
            qDebug("Removed deleted window from window list");
#endif
        }
    }
}

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;
    const QStringList keys = m_profiles.keys();
    for(const QString &key : keys) {
        l.append(key);
    }
    return l;
}

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