//////////////////////////////////////////////////////////////////////////////////////
//    akashi - a server for Attorney Online 2                                       //
//    Copyright (C) 2020  scatterflower                                             //
//                                                                                  //
//    This program is free software: you can redistribute it and/or modify          //
//    it under the terms of the GNU Affero 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 Affero General Public License for more details.                           //
//                                                                                  //
//    You should have received a copy of the GNU Affero General Public License      //
//    along with this program.  If not, see <https://www.gnu.org/licenses/>.        //
//////////////////////////////////////////////////////////////////////////////////////
#ifndef MUSIC_MANAGER_H
#define MUSIC_MANAGER_H

#include <QHash>
#include <QMap>
#include <QObject>
#include <QPair>

#include "include/aopacket.h"
#include "include/typedefs.h"

class ConfigManager;

class MusicManager : public QObject
{
    Q_OBJECT

  public:
    /**
     * @brief Constructor for the server-wide musiclist manager.
     *
     * @param Copy of the server musiclist generated by ConfigManager::musiclist();
     */
    MusicManager(QStringList f_root_ordered, QStringList f_cdns, QMap<QString, QPair<QString, int>> f_root_list, QObject *parent = nullptr);

    /**
     * @brief Destructor for the server-wide musiclist manager.
     */
    virtual ~MusicManager();

    /**
     * @brief Returns a musiclist with aliased names.
     *
     * @return See short description.
     */
    QStringList musiclist(int f_area_id);

    /**
     * @brief Returns only the root musiclist with aliased names.
     *
     */
    QStringList rootMusiclist();

    /**
     * @brief Adds a new area to the music_manager.
     *
     * @param f_area_id ID of the new area being added.
     *
     * @return Returns false if registering the area fails.
     */
    bool registerArea(int f_area_id);

    /**
     * @brief Validates the song candidate to be played. If validation fails, false is returned.
     *
     * @param f_song_name The song to be played. Can be an http/https stream or a local file.
     *
     * @param f_approved_cdns A list of approved remote content sources.
     *
     * @return Wether or not the song can be played or added.
     */
    bool validateSong(QString f_song_name, QStringList f_approved_cdns);

    /**
     * @brief Attempts to add the new song to the custom musiclist.
     *
     * @param f_song_name Friendly name shown in the clients musiclist.
     *
     * @param f_real_name Real name/url of the file.
     *
     * @param f_duration Playtime of the musicfile in seconds.
     *
     * @param f_area_id Area id of the clients current area.
     *
     * @return Returns true on success, false on fail.
     */
    bool addCustomSong(QString f_song_name, QString f_real_name, int f_duration, int f_area_id);

    /**
     * @brief Attempts to add the new category to the custom musiclist.
     *
     * @param f_category_name Category name candidate.
     *
     * @return Returns true on saccess, false on fail.
     */
    bool addCustomCategory(QString f_category_name, int f_area_id);

    /**
     * @brief Removes either a song or a category from the custom list.
     *
     * @param Name of the category or song to remove
     *
     * @return True on success, false on failure.
     */
    bool removeCategorySong(QString f_songcategory_name, int f_area_id);

    /**
     * @brief Toggles wether the root list is included for this area.
     * This also delets the custom llist if it was enabled prior.
     *
     * @return Current state of the music list.
     */
    bool toggleRootEnabled(int f_area_id);

    /**
     * @brief Removes conflicting songnames from the custom list.
     *
     * @param f_area_id Id of the area this is invoked in.
     */
    void sanitiseCustomList(int f_area_id);

    /**
     * @brief Removes all entries from the custom list.
     * @param f_area_id Id of the area custom list.
     */
    void clearCustomList(int f_area_id);

    /**
     * @brief Returns song information necessary for the operation of the jukebox.
     * @param Alias name of the song.
     * @param Area of the jukebox checking for information.
     * @return Returns a QPair with the true name and duration of the invoked song.
     */
    QPair<QString, int> songInformation(QString f_song_name, int f_area_id);

    /**
     * @brief Checks if a song is part of the clients current area custom list.
     *
     * @return Returns true if the song exists as a custom song.
     */
    bool isCustom(int f_area_id, QString f_song_name);

  public slots:

    /**
     * @brief Updates the root musiclist and CDN list.
     */
    void reloadRequest();

    /**
     * @brief Triggers sending of FM packet to client joining a new area.
     */
    void userJoinedArea(int f_area_index, int f_user_id);

  signals:

    /**
     * @brief Sends the FM packet with the musiclist of the area when a client enters.
     *
     * @param f_packet FM packet with the full musiclist, when enabled, and custom list.
     *
     * @param f_user_id temporary userid of the incoming client.
     */
    void sendFMPacket(AOPacket f_packet, int f_user_id);

    /**
     * @brief Sends the FM packet with the musiclist of the area when changes are made.
     *
     * @param f_packet FM packet with the full musiclist, when enabled, and eventual custom list.
     *
     * @param f_area_index Index of the current area the edit is made in.
     */
    void sendAreaFMPacket(AOPacket f_packet, int f_area_index);

  private:
    /**
     * @brief Contains all custom lists of all areas in the server.
     */
    QHash<int, MusicList> *m_custom_lists;

    /**
     * @brief Server musiclist shared among all areas.
     */
    MusicList m_root_list;

    /**
     * @brief QList with the ordered musiclist.
     */
    QStringList m_root_ordered;

    /**
     * @brief Contains all custom songs ordered in a per-area buffer.
     */
    QMap<int, QStringList> m_customs_ordered;

    /**
     * @brief Wether the global musiclist is prepend and validation when adding custom music.
     */
    QHash<int, bool> m_global_enabled;

    /**
     * @brief Contains all server approved content sources.
     */
    QStringList m_cdns;
};

#endif // MUSIC_MANAGER_H