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

/**
 * @typedef EBookFileObject
 * @property {string} ino
 * @property {string} ebookFormat
 * @property {number} addedAt
 * @property {number} updatedAt
 * @property {{filename:string, ext:string, path:string, relPath:string, size:number, mtimeMs:number, ctimeMs:number, birthtimeMs:number}} metadata
 */

/**
 * @typedef ChapterObject
 * @property {number} id
 * @property {number} start
 * @property {number} end
 * @property {string} title
 */

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

    /** @type {string} */
    this.id
    /** @type {string} */
    this.title
    /** @type {string} */
    this.titleIgnorePrefix
    /** @type {string} */
    this.publishedYear
    /** @type {string} */
    this.publishedDate
    /** @type {string} */
    this.publisher
    /** @type {string} */
    this.description
    /** @type {string} */
    this.isbn
    /** @type {string} */
    this.asin
    /** @type {string} */
    this.language
    /** @type {boolean} */
    this.explicit
    /** @type {boolean} */
    this.abridged
    /** @type {string} */
    this.coverPath
    /** @type {number} */
    this.duration
    /** @type {string[]} */
    this.narrators
    /** @type {Object} */
    this.audioFiles
    /** @type {EBookFileObject} */
    this.ebookFile
    /** @type {ChapterObject[]} */
    this.chapters
    /** @type {string[]} */
    this.tags
    /** @type {string[]} */
    this.genres
    /** @type {Date} */
    this.updatedAt
    /** @type {Date} */
    this.createdAt
  }

  static getOldBook(libraryItemExpanded) {
    const bookExpanded = libraryItemExpanded.media
    let authors = []
    if (bookExpanded.authors?.length) {
      authors = bookExpanded.authors.map(au => {
        return {
          id: au.id,
          name: au.name
        }
      })
    } else if (bookExpanded.bookAuthors?.length) {
      authors = bookExpanded.bookAuthors.map(ba => {
        if (ba.author) {
          return {
            id: ba.author.id,
            name: ba.author.name
          }
        } else {
          Logger.error(`[Book] Invalid bookExpanded bookAuthors: no author`, ba)
          return null
        }
      }).filter(a => a)
    }

    let series = []
    if (bookExpanded.series?.length) {
      series = bookExpanded.series.map(se => {
        return {
          id: se.id,
          name: se.name,
          sequence: se.bookSeries.sequence
        }
      })
    } else if (bookExpanded.bookSeries?.length) {
      series = bookExpanded.bookSeries.map(bs => {
        if (bs.series) {
          return {
            id: bs.series.id,
            name: bs.series.name,
            sequence: bs.sequence
          }
        } else {
          Logger.error(`[Book] Invalid bookExpanded bookSeries: no series`, bs)
          return null
        }
      }).filter(s => s)
    }

    return {
      id: bookExpanded.id,
      libraryItemId: libraryItemExpanded.id,
      coverPath: bookExpanded.coverPath,
      tags: bookExpanded.tags,
      audioFiles: bookExpanded.audioFiles,
      chapters: bookExpanded.chapters,
      ebookFile: bookExpanded.ebookFile,
      metadata: {
        title: bookExpanded.title,
        subtitle: bookExpanded.subtitle,
        authors: authors,
        narrators: bookExpanded.narrators,
        series: series,
        genres: bookExpanded.genres,
        publishedYear: bookExpanded.publishedYear,
        publishedDate: bookExpanded.publishedDate,
        publisher: bookExpanded.publisher,
        description: bookExpanded.description,
        isbn: bookExpanded.isbn,
        asin: bookExpanded.asin,
        language: bookExpanded.language,
        explicit: bookExpanded.explicit,
        abridged: bookExpanded.abridged
      }
    }
  }

  /**
   * @param {object} oldBook 
   * @returns {boolean} true if updated
   */
  static saveFromOld(oldBook) {
    const book = this.getFromOld(oldBook)
    return this.update(book, {
      where: {
        id: book.id
      }
    }).then(result => result[0] > 0).catch((error) => {
      Logger.error(`[Book] Failed to save book ${book.id}`, error)
      return false
    })
  }

  static getFromOld(oldBook) {
    return {
      id: oldBook.id,
      title: oldBook.metadata.title,
      titleIgnorePrefix: oldBook.metadata.titleIgnorePrefix,
      subtitle: oldBook.metadata.subtitle,
      publishedYear: oldBook.metadata.publishedYear,
      publishedDate: oldBook.metadata.publishedDate,
      publisher: oldBook.metadata.publisher,
      description: oldBook.metadata.description,
      isbn: oldBook.metadata.isbn,
      asin: oldBook.metadata.asin,
      language: oldBook.metadata.language,
      explicit: !!oldBook.metadata.explicit,
      abridged: !!oldBook.metadata.abridged,
      narrators: oldBook.metadata.narrators,
      ebookFile: oldBook.ebookFile?.toJSON() || null,
      coverPath: oldBook.coverPath,
      duration: oldBook.duration,
      audioFiles: oldBook.audioFiles?.map(af => af.toJSON()) || [],
      chapters: oldBook.chapters,
      tags: oldBook.tags,
      genres: oldBook.metadata.genres
    }
  }

  /**
   * Initialize model
   * @param {import('../Database').sequelize} sequelize 
   */
  static init(sequelize) {
    super.init({
      id: {
        type: DataTypes.UUID,
        defaultValue: DataTypes.UUIDV4,
        primaryKey: true
      },
      title: DataTypes.STRING,
      titleIgnorePrefix: DataTypes.STRING,
      subtitle: DataTypes.STRING,
      publishedYear: DataTypes.STRING,
      publishedDate: DataTypes.STRING,
      publisher: DataTypes.STRING,
      description: DataTypes.TEXT,
      isbn: DataTypes.STRING,
      asin: DataTypes.STRING,
      language: DataTypes.STRING,
      explicit: DataTypes.BOOLEAN,
      abridged: DataTypes.BOOLEAN,
      coverPath: DataTypes.STRING,
      duration: DataTypes.FLOAT,

      narrators: DataTypes.JSON,
      audioFiles: DataTypes.JSON,
      ebookFile: DataTypes.JSON,
      chapters: DataTypes.JSON,
      tags: DataTypes.JSON,
      genres: DataTypes.JSON
    }, {
      sequelize,
      modelName: 'book',
      indexes: [
        {
          fields: [{
            name: 'title',
            collate: 'NOCASE'
          }]
        },
        {
          fields: [{
            name: 'titleIgnorePrefix',
            collate: 'NOCASE'
          }]
        },
        {
          fields: ['publishedYear']
        },
        {
          fields: ['duration']
        }
      ]
    })
  }
}

module.exports = Book