/***************************************************************************
 *   Copyright (C) 2008-2022 by Ilya Kotov                                 *
 *   forkotov02@ya.ru                                                      *
 *                                                                         *
 *   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 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, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.         *
 ***************************************************************************/

#include <QApplication>
#include <QFileInfo>
#include <qmmp/soundcore.h>
#include <qmmpui/mediaplayer.h>
#include <qmmpui/uihelper.h>
#include <qmmpui/filedialog.h>
#include <qmmpui/uihelper.h>
#include <qmmpui/qmmpuisettings.h>
#include <qmmpui/playlistdownloader.h>
#include <qmmpui/playlistparser.h>
#include <qmmp/metadatamanager.h>
#include "builtincommandlineoption.h"

BuiltinCommandLineOption::BuiltinCommandLineOption(QObject *parent) : QObject(parent)
{
    m_model = nullptr;
    m_options << "--enqueue" << "-e"
              << "--play" << "-p"
              << "--pause" << "-u"
              << "--play-pause" << "-t"
              << "--stop" << "-s"
              << "--jump-to-file" << "-j"
              << "--quit" << "-q"
              << "--volume" << "--volume-status"
              << "--toggle-mute" << "--mute-status"
              << "--next" << "--previous"
              << "--toggle-visibility"
              << "--show-mw"
              << "--add-file" << "--add-dir";
#ifdef Q_OS_WIN
    m_timer = new QTimer(this);
    m_timer->setSingleShot(true);
    m_timer->setInterval(500);
    connect(m_timer, SIGNAL(timeout()), SLOT(addPendingPaths()));
#endif
}

BuiltinCommandLineOption::~BuiltinCommandLineOption()
{
}

// BuiltinCommandLineOption methods implementation
bool BuiltinCommandLineOption::identify(const QString &str) const
{
    return m_options.contains(str);
}

const QStringList BuiltinCommandLineOption::helpString() const
{
    return QStringList()
            << QString("-e, --enqueue") + "||" + tr("Don't clear the playlist")
            << QString("-p, --play") + "||" + tr("Start playing current song")
            << QString("-u, --pause") + "||" + tr("Pause current song")
            << QString("-t, --play-pause") + "||" + tr("Pause if playing, play otherwise")
            << QString("-s, --stop") + "||" + tr("Stop current song")
            << QString("-j, --jump-to-file") + "||" + tr("Display Jump to File dialog")
            << QString("-q, --quit") + "||" + tr("Quit application")
            << QString("--volume <0..100>") + "||" + tr("Set playback volume (example: qmmp --volume 20)")
            << QString("--volume-status") + "||" + tr("Print volume level")
            << QString("--toggle-mute") + "||" + tr("Mute/Restore volume")
            << QString("--mute-status") + "||" + tr("Print mute status")
            << QString("--next") + "||" + tr("Skip forward in playlist")
            << QString("--previous") + "||" + tr("Skip backwards in playlist")
            << QString("--toggle-visibility") + "||" + tr("Show/hide application")
            << QString("--show-mw") + "||" + tr("Show main window")
            << QString("--add-file") + "||" + tr("Display Add File dialog")
            << QString("--add-dir") + "||" + tr("Display Add Directory dialog");
}

QString BuiltinCommandLineOption::executeCommand(const QString &option_string, const QStringList &args, const QString &cwd)
{
    SoundCore *core = SoundCore::instance();
    MediaPlayer *player = MediaPlayer::instance();
    PlayListManager *pl_manager = PlayListManager::instance();
    QmmpUiSettings *settings = QmmpUiSettings::instance();
    QString out;
    if(!core || !player)
        return out;
    if(option_string == "--enqueue" || option_string == "-e" || option_string.isEmpty())
    {
        if(args.isEmpty())
            return out;
        QStringList full_path_list, remote_pls_list;
        for(QString s : qAsConst(args))
        {
#ifdef Q_OS_WIN
            s.replace("\\","/");
#endif
            if (QFileInfo(s).isAbsolute()) //absolute path
                    full_path_list << s;
            else if(s.contains("://")) //url
            {
                if(PlayListParser::findByUrl(s)) //remote playlist
                    remote_pls_list << s;
                else
                    full_path_list << s; //url
            }
            else //relative path
                full_path_list << cwd + "/" + s;
        }
        //default playlist
        if(settings->useDefaultPlayList())
        {
            if(!pl_manager->playListNames().contains(settings->defaultPlayListName()))
                pl_manager->createPlayList(settings->defaultPlayListName());
            pl_manager->selectPlayList(settings->defaultPlayListName());
        }
        pl_manager->activatePlayList(pl_manager->selectedPlayList());
        m_model = pl_manager->selectedPlayList();

        if(option_string.isEmpty())
        {
            m_model->clear(); //clear playlist if option is empty
            m_pending_path_list << full_path_list;
#ifdef Q_OS_WIN
            //windows starts instance for each selected file,
            //so we should wait paths from all started qmmp instances
            m_timer->start();
#else
            addPendingPaths();
#endif
        }
        else
            m_model->add(full_path_list);
        if(!remote_pls_list.isEmpty())
        {
            PlayListDownloader *downloader = new PlayListDownloader(this);
            connect(downloader, SIGNAL(finished(bool,QString)), downloader, SLOT(deleteLater()));
            downloader->start(remote_pls_list.at(0), m_model);
        }
    }
    else if (option_string == "--play" || option_string == "-p")
    {
        player->play();
    }
    else if (option_string == "--stop" || option_string == "-s")
    {
        core->stop();
    }
    else if (option_string == "--pause" || option_string == "-u")
    {
        if(core->state() == Qmmp::Playing)
            core->pause();
    }
    else if (option_string == "--next")
    {
        player->next();
        if (core->state() == Qmmp::Stopped)
            player->play();
    }
    else if (option_string == "--previous")
    {
        player->previous();
        if (core->state() == Qmmp::Stopped)
            player->play();
    }
    else if (option_string == "--play-pause"  || option_string == "-t")
    {
        if (core->state() == Qmmp::Playing)
            core->pause();
        else
            player->play();
    }
    else if (option_string == "--jump-to-file" || option_string == "-j")
    {
        UiHelper::instance()->jumpToTrack();
    }
    else if (option_string == "--quit" || option_string == "-q")
    {
        qApp->closeAllWindows();
        qApp->quit();
    }
    else if (option_string == "--toggle-visibility")
    {
        UiHelper::instance()->toggleVisibility();
    }
    else if (option_string == "--show-mw")
    {
        UiHelper::instance()->showMainWindow();
    }
    else if (option_string == "--add-file")
    {
        UiHelper::instance()->addFiles();
    }
    else if (option_string == "--add-dir")
    {
        UiHelper::instance()->addDirectory();
    }
    else if (option_string == "--volume" && !args.isEmpty())
    {
        bool ok = false;
        int volume = args.at(0).toInt(&ok);
        if (ok)
            core->setVolume(volume,volume);
    }
    else if (option_string == "--volume-status")
    {
        out += QString("%1\n").arg(core->volume());
    }
    else if (option_string == "--toggle-mute")
    {
        core->setMuted(!core->isMuted());
    }
    else if (option_string == "--mute-status")
    {
        out += QString("%1\n").arg(core->isMuted());
    }
    return out;
}

QHash <QString, QStringList> BuiltinCommandLineOption::splitArgs(const QStringList &args) const
{
    QHash <QString, QStringList> commands;
    QString lastCmd;
    for(const QString &arg : qAsConst(args))
    {
        QString cmd = arg.trimmed();
        if(cmd.startsWith("-") || cmd.startsWith("--"))
        {
            commands.insert(cmd, QStringList());
            lastCmd = cmd;
        }
        else if(!commands.isEmpty() && !lastCmd.isEmpty())
            commands[lastCmd] << arg;
    }
    return commands;
}

void BuiltinCommandLineOption::disconnectPl()
{
    if(m_model)
    {
        disconnect(m_model, SIGNAL(trackAdded(PlayListTrack*)), MediaPlayer::instance(), SLOT(play()));
        disconnect(m_model, SIGNAL(trackAdded(PlayListTrack*)), this, SLOT(disconnectPl()));
        disconnect(m_model, SIGNAL(loaderFinished()), this, SLOT(disconnectPl()));
        m_model = nullptr;
    }
}

void BuiltinCommandLineOption::addPendingPaths()
{
    if(m_pending_path_list.isEmpty())
        return;

    SoundCore *core = SoundCore::instance();
    MediaPlayer *player = MediaPlayer::instance();
    PlayListManager *pl_manager = PlayListManager::instance();

    if (core->state() != Qmmp::Stopped)
    {
        core->stop();
        qApp->processEvents(); //receive stop signal
    }
    m_model = pl_manager->selectedPlayList();
    m_model->clear();

    connect(m_model, SIGNAL(trackAdded(PlayListTrack*)), player, SLOT(play()));
    connect(m_model, SIGNAL(trackAdded(PlayListTrack*)), SLOT(disconnectPl()));
    connect(m_model, SIGNAL(loaderFinished()), SLOT(disconnectPl()));

    m_model->add(m_pending_path_list);
    m_pending_path_list.clear();
}