const { from_string_to_seconds, from_seconds_to_string } = require('./helpers/duration')

/**
 * @class
 */
class Track {
  #url
  #title
  #length
  #source
  #last_played
  #play_count

  /**
   * @constructor
   * @param {Object} parameters={}
   * @param {string} parameters.url The url of the track
   * @param {string} parameters.title The title of the track
   * @param {number|durationString} parameters.length The length of the track, either in seconds or following the [[HH:]mm:]ss format.
   * @param {string} parameters.source The source where the track comes from. Note that as of now, only <code>'youtube'</code> is supported.
   * @param {number|Date} [parameters.last_played=0] The timestamp when this track has been played for the last time
   * @param {number} [parameters.play_count=0] The number of times this track has been played
   */
  constructor({url, title, full_title, length, source, last_played = 0, play_count = 0} = {}) {
    if (typeof length === 'string') {
      this.#length = from_string_to_seconds(length)
    } else {
      this.#length = length
    }
    this.#url = url
    this.#title = title || full_title
    this.#source = source
    this.#last_played = new Date(last_played)
    this.#play_count = play_count
  }

  /**
   * @returns {Track} A copy of the current track
   */
  clone() {
    return new Track(this.toJSON())
  }

  /**
   * @returns {Object} A JSON object that describe the track<br />
   * This object can be sent back to the {@link Track} constructor if needed
   */
  toJSON() {
    return {
      url: this.#url,
      title: this.#title,
      length: this.#length,
      source: this.#source,
      last_played: this.#last_played.getTime(),
      play_count: this.#play_count
    }
  }

  /**
   * @returns {string} A string representation of the track
   */
  toString() {
    return this.#title + ' (' + this.get_length_as_string() + ')'
  }

  /**
   * @returns {string} The url of the track
   */
  get_url() {
    return this.#url
  }

  /**
   * @returns {string} The title of the track
   */
  get_title() {
    return this.#title
  }

  /**
   * @returns {string} The full title of the track
   */
  get_full_title() {
    return this.#title
  }

  /**
   * @returns {number} The length of the track, in seconds
   */
  get_length() {
    return this.#length
  }

  /**
   * @returns {string} The source where the track comes from, mostly <code>'youtube'</code>
   */
  get_source() {
    return this.#source
  }

  /**
   * Update the play count and the last played date of the track. This method is meant to be used by the {@link Player} class<br />
   * Note that this will be updated in the database file only after a !register
   */
  update_play_count() {
    this.#play_count += 1
    this.#last_played = new Date()
  }

  /**
   * @returns {durationString} A string representation of the track length
   */
  get_length_as_string() {
    return from_seconds_to_string(this.#length)
  }
}

module.exports = { Track }