const { parseDate } = require('../util');

const Playlist = require('./Playlist');
const ScheduledPlaylistItem = require('./ScheduledPlaylistItem');

/**
 * Playlist for modes with a single map (e.g. [Shadow Royale]{@link https://apexlegends.fandom.com/wiki/Shadow_Royale}).
 *
 * @extends playlist
 */
class SingleItemPlaylist extends Playlist {
    /**
     * Construct a playlist which contains a single map from {@link playlistData}.
     *
     * @param {playlistData} playlistData data for this playlist
     * @param {seasonData} seasonData data for this playlist's parent {@link Season}
     */
    constructor(playlistData, seasonData) {
        super(playlistData, seasonData);

        /**
         * Array containing a single {@link ScheduledPlaylistItem}. Type matches
         * other classes which extend {@link Playlist} so that Array methods
         * can be used predictably.
         *
         * @type {ScheduledPlaylistItem[]}
         */
        this.rotations = [new ScheduledPlaylistItem({
            mapName: this.maps[0],
            mapDuration: (this.endTime - this.startTime),
            startTime: this.startTime
        }, this)];
    };

    /**
     * The {@link ScheduledPlaylistItem} for this playlist if within date
     * bounds, otherwise {@link null}.
     *
     * @readonly
     * @memberof SingleItemPlaylist
     * @type {?ScheduledPlaylistItem}
     */
    get currentMap() {
        if (new Date() < this.startTime) return null;
        if (new Date() > this.endTime) return null;
        return this.rotations[0];
    };

    /**
     * The {@link ScheduledPlaylistItem} for this playlist if before the
     * [start time]{@link Playlist#startTime}, otherwise {@link null}.
     *
     * @readonly
     * @memberof SingleItemPlaylist
     * @type {?ScheduledPlaylistItem}
     */
    get nextMap() {
        if (new Date() < this.startTime) return this.rotations[0];
        return null;
    };

    /**
     * The {@link ScheduledPlaylistItem} for this playlist if within date
     * bounds, otherwise {@link null}.
     *
     * @param {parseableDate} [date=new Date()] the date to target
     * @returns {?ScheduledPlaylistItem} active map or {@link null}
     */
    getMapByDate(date) {
        const targetDate = parseDate(date);

        if(targetDate < this.startTime) return null;
        if(targetDate > this.endTime) return null;
        return this.rotations[0];
    };
};

module.exports = SingleItemPlaylist;