const { DataTypes, Model } = require('sequelize')

class MediaProgress extends Model {
  constructor(values, options) {
    super(values, options)

    /** @type {UUIDV4} */
    this.id
    /** @type {UUIDV4} */
    this.mediaItemId
    /** @type {string} */
    this.mediaItemType
    /** @type {number} */
    this.duration
    /** @type {number} */
    this.currentTime
    /** @type {boolean} */
    this.isFinished
    /** @type {boolean} */
    this.hideFromContinueListening
    /** @type {string} */
    this.ebookLocation
    /** @type {number} */
    this.ebookProgress
    /** @type {Date} */
    this.finishedAt
    /** @type {Object} */
    this.extraData
    /** @type {UUIDV4} */
    this.userId
    /** @type {Date} */
    this.updatedAt
    /** @type {Date} */
    this.createdAt
  }

  getOldMediaProgress() {
    const isPodcastEpisode = this.mediaItemType === 'podcastEpisode'

    return {
      id: this.id,
      userId: this.userId,
      libraryItemId: this.extraData?.libraryItemId || null,
      episodeId: isPodcastEpisode ? this.mediaItemId : null,
      mediaItemId: this.mediaItemId,
      mediaItemType: this.mediaItemType,
      duration: this.duration,
      progress: this.extraData?.progress || 0,
      currentTime: this.currentTime,
      isFinished: !!this.isFinished,
      hideFromContinueListening: !!this.hideFromContinueListening,
      ebookLocation: this.ebookLocation,
      ebookProgress: this.ebookProgress,
      lastUpdate: this.updatedAt.valueOf(),
      startedAt: this.createdAt.valueOf(),
      finishedAt: this.finishedAt?.valueOf() || null
    }
  }

  static upsertFromOld(oldMediaProgress) {
    const mediaProgress = this.getFromOld(oldMediaProgress)
    return this.upsert(mediaProgress)
  }

  static getFromOld(oldMediaProgress) {
    return {
      id: oldMediaProgress.id,
      userId: oldMediaProgress.userId,
      mediaItemId: oldMediaProgress.mediaItemId,
      mediaItemType: oldMediaProgress.mediaItemType,
      duration: oldMediaProgress.duration,
      currentTime: oldMediaProgress.currentTime,
      ebookLocation: oldMediaProgress.ebookLocation || null,
      ebookProgress: oldMediaProgress.ebookProgress || null,
      isFinished: !!oldMediaProgress.isFinished,
      hideFromContinueListening: !!oldMediaProgress.hideFromContinueListening,
      finishedAt: oldMediaProgress.finishedAt,
      createdAt: oldMediaProgress.startedAt || oldMediaProgress.lastUpdate,
      updatedAt: oldMediaProgress.lastUpdate,
      extraData: {
        libraryItemId: oldMediaProgress.libraryItemId,
        progress: oldMediaProgress.progress
      }
    }
  }

  static removeById(mediaProgressId) {
    return this.destroy({
      where: {
        id: mediaProgressId
      }
    })
  }

  getMediaItem(options) {
    if (!this.mediaItemType) return Promise.resolve(null)
    const mixinMethodName = `get${this.sequelize.uppercaseFirst(this.mediaItemType)}`
    return this[mixinMethodName](options)
  }

  /**
   * Initialize model
   *
   * Polymorphic association: Book has many MediaProgress. PodcastEpisode has many MediaProgress.
   * @see https://sequelize.org/docs/v6/advanced-association-concepts/polymorphic-associations/
   *
   * @param {import('../Database').sequelize} sequelize
   */
  static init(sequelize) {
    super.init(
      {
        id: {
          type: DataTypes.UUID,
          defaultValue: DataTypes.UUIDV4,
          primaryKey: true
        },
        mediaItemId: DataTypes.UUIDV4,
        mediaItemType: DataTypes.STRING,
        duration: DataTypes.FLOAT,
        currentTime: DataTypes.FLOAT,
        isFinished: DataTypes.BOOLEAN,
        hideFromContinueListening: DataTypes.BOOLEAN,
        ebookLocation: DataTypes.STRING,
        ebookProgress: DataTypes.FLOAT,
        finishedAt: DataTypes.DATE,
        extraData: DataTypes.JSON
      },
      {
        sequelize,
        modelName: 'mediaProgress',
        indexes: [
          {
            fields: ['updatedAt']
          }
        ]
      }
    )

    const { book, podcastEpisode, user } = sequelize.models

    book.hasMany(MediaProgress, {
      foreignKey: 'mediaItemId',
      constraints: false,
      scope: {
        mediaItemType: 'book'
      }
    })
    MediaProgress.belongsTo(book, { foreignKey: 'mediaItemId', constraints: false })

    podcastEpisode.hasMany(MediaProgress, {
      foreignKey: 'mediaItemId',
      constraints: false,
      scope: {
        mediaItemType: 'podcastEpisode'
      }
    })
    MediaProgress.belongsTo(podcastEpisode, { foreignKey: 'mediaItemId', constraints: false })

    MediaProgress.addHook('afterFind', (findResult) => {
      if (!findResult) return

      if (!Array.isArray(findResult)) findResult = [findResult]

      for (const instance of findResult) {
        if (instance.mediaItemType === 'book' && instance.book !== undefined) {
          instance.mediaItem = instance.book
          instance.dataValues.mediaItem = instance.dataValues.book
        } else if (instance.mediaItemType === 'podcastEpisode' && instance.podcastEpisode !== undefined) {
          instance.mediaItem = instance.podcastEpisode
          instance.dataValues.mediaItem = instance.dataValues.podcastEpisode
        }
        // To prevent mistakes:
        delete instance.book
        delete instance.dataValues.book
        delete instance.podcastEpisode
        delete instance.dataValues.podcastEpisode
      }
    })

    user.hasMany(MediaProgress, {
      onDelete: 'CASCADE'
    })
    MediaProgress.belongsTo(user)
  }
}

module.exports = MediaProgress