const Path = require('path')
const fs = require('fs-extra')
const { bytesPretty, readTextFile } = require('../utils/fileUtils')
const { comparePaths, getIno, getId, elapsedPretty } = require('../utils/index')
const { parseOpfMetadataXML } = require('../utils/parseOpfMetadata')
const { extractCoverArt } = require('../utils/ffmpegHelpers')
const nfoGenerator = require('../utils/nfoGenerator')
const abmetadataGenerator = require('../utils/abmetadataGenerator')
const Logger = require('../Logger')
const Book = require('./Book')
const AudioTrack = require('./AudioTrack')
const AudioFile = require('./AudioFile')
const AudiobookFile = require('./AudiobookFile')

class Audiobook {
  constructor(audiobook = null) {
    this.id = null
    this.ino = null // Inode

    this.libraryId = null
    this.folderId = null

    this.path = null
    this.fullPath = null
    this.addedAt = null
    this.lastUpdate = null
    this.lastScan = null
    this.scanVersion = null

    this.tracks = []
    this.missingParts = []

    this.audioFiles = []
    this.otherFiles = []

    this.tags = []
    this.book = null
    this.chapters = []

    // Audiobook was scanned and not found
    this.isMissing = false
    // Audiobook no longer has "book" files
    this.isInvalid = false

    if (audiobook) {
      this.construct(audiobook)
    }

    // Temp flags
    this.isSavingMetadata = false
  }

  construct(audiobook) {
    this.id = audiobook.id
    this.ino = audiobook.ino || null
    this.libraryId = audiobook.libraryId || 'main'
    this.folderId = audiobook.folderId || 'audiobooks'
    this.path = audiobook.path
    this.fullPath = audiobook.fullPath
    this.addedAt = audiobook.addedAt
    this.lastUpdate = audiobook.lastUpdate || this.addedAt
    this.lastScan = audiobook.lastScan || null
    this.scanVersion = audiobook.scanVersion || null

    this.tracks = audiobook.tracks.map(track => new AudioTrack(track))
    this.missingParts = audiobook.missingParts

    this.audioFiles = audiobook.audioFiles.map(file => new AudioFile(file))
    this.otherFiles = audiobook.otherFiles.map(file => new AudiobookFile(file))

    this.tags = audiobook.tags
    if (audiobook.book) {
      this.book = new Book(audiobook.book)
    }
    if (audiobook.chapters) {
      this.chapters = audiobook.chapters.map(c => ({ ...c }))
    }

    this.isMissing = !!audiobook.isMissing
    this.isInvalid = !!audiobook.isInvalid
  }

  get title() {
    return this.book ? this.book.title : 'No Title'
  }

  get author() {
    return this.book ? this.book.author : 'Unknown'
  }

  get cover() {
    return this.book ? this.book.cover : ''
  }

  get authorLF() {
    return this.book ? this.book.authorLF : null
  }

  get authorFL() {
    return this.book ? this.book.authorFL : null
  }

  get genres() {
    return this.book ? this.book.genres || [] : []
  }

  get duration() {
    var total = 0
    this.tracks.forEach((track) => total += track.duration)
    return total
  }

  get size() {
    var total = 0
    this.tracks.forEach((track) => total += track.size)
    return total
  }

  get sizePretty() {
    return bytesPretty(this.size)
  }

  get durationPretty() {
    return elapsedPretty(this.duration)
  }

  get invalidParts() {
    return this._audioFiles.filter(af => af.invalid).map(af => ({ filename: af.filename, error: af.error || 'Unknown Error' }))
  }

  get numMissingParts() {
    return this.missingParts ? this.missingParts.length : 0
  }

  get numInvalidParts() {
    return this.invalidParts ? this.invalidParts.length : 0
  }

  get _audioFiles() { return this.audioFiles || [] }
  get _otherFiles() { return this.otherFiles || [] }
  get _tracks() { return this.tracks || [] }

  get audioFilesToInclude() { return this._audioFiles.filter(af => !af.exclude) }

  get ebooks() {
    return this.otherFiles.filter(file => file.filetype === 'ebook')
  }

  get hasMissingIno() {
    return !this.ino || this._audioFiles.find(abf => !abf.ino) || this._otherFiles.find(f => !f.ino) || this._tracks.find(t => !t.ino)
  }

  get hasEmbeddedCoverArt() {
    return !!this._audioFiles.find(af => af.embeddedCoverArt)
  }

  // TEMP: Issue with inodes not always being set for files
  getFilesWithMissingIno() {
    var afs = this._audioFiles.filter(af => !af.ino)
    var ofs = this._otherFiles.filter(f => !f.ino)
    var ts = this._tracks.filter(t => !t.ino)
    return afs.concat(ofs).concat(ts)
  }

  bookToJSON() {
    return this.book ? this.book.toJSON() : null
  }

  tracksToJSON() {
    if (!this.tracks || !this.tracks.length) return []
    return this.tracks.map(t => t.toJSON())
  }

  toJSON() {
    return {
      id: this.id,
      ino: this.ino,
      libraryId: this.libraryId,
      folderId: this.folderId,
      path: this.path,
      fullPath: this.fullPath,
      addedAt: this.addedAt,
      lastUpdate: this.lastUpdate,
      lastScan: this.lastScan,
      scanVersion: this.scanVersion,
      missingParts: this.missingParts,
      tags: this.tags,
      book: this.bookToJSON(),
      tracks: this.tracksToJSON(),
      audioFiles: this._audioFiles.map(audioFile => audioFile.toJSON()),
      otherFiles: this._otherFiles.map(otherFile => otherFile.toJSON()),
      chapters: this.chapters || [],
      isMissing: !!this.isMissing,
      isInvalid: !!this.isInvalid
    }
  }

  toJSONMinified() {
    return {
      id: this.id,
      ino: this.ino,
      libraryId: this.libraryId,
      folderId: this.folderId,
      book: this.bookToJSON(),
      tags: this.tags,
      path: this.path,
      fullPath: this.fullPath,
      addedAt: this.addedAt,
      lastUpdate: this.lastUpdate,
      duration: this.duration,
      size: this.size,
      ebooks: this.ebooks.map(ebook => ebook.toJSON()),
      numEbooks: this.ebooks.length,
      numTracks: this.tracks.length,
      numChapters: (this.chapters || []).length,
      isMissing: !!this.isMissing,
      isInvalid: !!this.isInvalid,
      hasMissingParts: this.numMissingParts,
      hasInvalidParts: this.numInvalidParts
    }
  }

  toJSONExpanded() {
    return {
      id: this.id,
      ino: this.ino,
      libraryId: this.libraryId,
      folderId: this.folderId,
      path: this.path,
      fullPath: this.fullPath,
      addedAt: this.addedAt,
      lastUpdate: this.lastUpdate,
      duration: this.duration,
      durationPretty: this.durationPretty,
      size: this.size,
      sizePretty: this.sizePretty,
      missingParts: this.missingParts,
      invalidParts: this.invalidParts,
      audioFiles: this._audioFiles.map(audioFile => audioFile.toJSON()),
      otherFiles: this._otherFiles.map(otherFile => otherFile.toJSON()),
      ebooks: this.ebooks.map(ebook => ebook.toJSON()),
      numEbooks: this.ebooks.length,
      numTracks: this.tracks.length,
      tags: this.tags,
      book: this.bookToJSON(),
      tracks: this.tracksToJSON(),
      chapters: this.chapters || [],
      isMissing: !!this.isMissing,
      isInvalid: !!this.isInvalid,
      hasMissingParts: this.numMissingParts,
      hasInvalidParts: this.numInvalidParts
    }
  }

  // Originally files did not store the inode value
  // this function checks all files and sets the inode
  async checkUpdateInos() {
    var hasUpdates = false

    // Audiobook folder needs inode
    if (!this.ino) {
      this.ino = await getIno(this.fullPath)
      hasUpdates = true
    }

    // Check audio files have an inode
    for (let i = 0; i < this.audioFiles.length; i++) {
      var af = this.audioFiles[i]
      var at = this.tracks.find(t => t.ino === af.ino)
      if (!at) {
        at = this.tracks.find(t => comparePaths(t.path, af.path))
        if (!at && !af.exclude) {
          Logger.warn(`[Audiobook] No matching track for audio file "${af.filename}"`)
        }
      }
      if (!af.ino || af.ino === this.ino) {
        af.ino = await getIno(af.fullPath)
        if (!af.ino) {
          Logger.error('[Audiobook] checkUpdateInos: Failed to set ino for audio file', af.fullPath)
        } else {
          Logger.debug(`[Audiobook] Set INO For audio file ${af.path}`)
          if (at) at.ino = af.ino
        }
        hasUpdates = true
      } else if (at && at.ino !== af.ino) {
        at.ino = af.ino
        hasUpdates = true
      }
    }

    for (let i = 0; i < this.tracks.length; i++) {
      var at = this.tracks[i]
      if (!at.ino) {
        Logger.debug(`[Audiobook] Track ${at.filename} still does not have ino`)
        var atino = await getIno(at.fullPath)
        var af = this.audioFiles.find(_af => _af.ino === atino)
        if (!af) {
          Logger.debug(`[Audiobook] Track ${at.filename} no matching audio file with ino ${atino}`)
          af = this.audioFiles.find(_af => _af.filename === at.filename)
          if (!af) {
            Logger.debug(`[Audiobook] Track ${at.filename} no matching audio file with filename`)
          } else {
            Logger.debug(`[Audiobook] Track ${at.filename} found matching filename but mismatch ino ${atino}/${af.ino}`)
            // at.ino = af.ino
            // at.path = af.path
            // at.fullPath = af.fullPath
            // hasUpdates = true
          }
        } else {
          Logger.debug(`[Audiobook] Track ${at.filename} found audio file with matching ino ${at.path}/${af.path}`)
        }
      }
    }

    for (let i = 0; i < this.otherFiles.length; i++) {
      var file = this.otherFiles[i]
      if (!file.ino || file.ino === this.ino) {
        file.ino = await getIno(file.fullPath)
        if (!file.ino) {
          Logger.error('[Audiobook] checkUpdateInos: Failed to set ino for other file', file.fullPath)
        } else {
          Logger.debug(`[Audiobook] Set INO For other file ${file.path}`)
        }
        hasUpdates = true
      }
    }
    return hasUpdates
  }

  setData(data) {
    this.id = getId('ab')
    this.libraryId = data.libraryId || 'main'
    this.folderId = data.folderId || 'audiobooks'
    this.ino = data.ino || null

    this.path = data.path
    this.fullPath = data.fullPath
    this.addedAt = Date.now()
    this.lastUpdate = this.addedAt

    if (data.otherFiles) {
      data.otherFiles.forEach((file) => {
        this.addOtherFile(file)
      })
    }

    this.setBook(data)
  }

  checkHasOldCoverPath() {
    return this.book.cover && !this.book.coverFullPath
  }

  setLastScan(version) {
    this.lastScan = Date.now()
    this.lastUpdate = Date.now()
    this.scanVersion = version
  }

  setMissing() {
    this.isMissing = true
    this.lastUpdate = Date.now()
  }

  setInvalid() {
    this.isInvalid = true
    this.lastUpdate = Date.now()
  }

  setBook(data) {
    // Use first image file as cover
    if (this.otherFiles && this.otherFiles.length) {
      var imageFile = this.otherFiles.find(f => f.filetype === 'image')
      if (imageFile) {
        data.coverFullPath = imageFile.fullPath
        var relImagePath = imageFile.path.replace(this.path, '')
        data.cover = Path.posix.join(`/s/book/${this.id}`, relImagePath)
      }
    }

    this.book = new Book()
    this.book.setData(data)
  }

  setCoverFromFile(file) {
    if (!file || !file.fullPath || !file.path) {
      Logger.error(`[Audiobook] "${this.title}" Invalid file for setCoverFromFile`, file)
      return false
    }
    var updateBookPayload = {}
    updateBookPayload.coverFullPath = file.fullPath
    // Set ab local static path from file relative path
    var relImagePath = file.path.replace(this.path, '')
    updateBookPayload.cover = Path.posix.join(`/s/book/${this.id}`, relImagePath)
    return this.book.update(updateBookPayload)
  }

  addTrack(trackData) {
    var track = new AudioTrack()
    track.setData(trackData)
    this.tracks.push(track)
    return track
  }

  addAudioFile(audioFileData) {
    this.audioFiles.push(audioFileData)
    return audioFileData
  }

  updateAudioFile(updatedAudioFile) {
    var audioFile = this.audioFiles.find(af => af.ino === updatedAudioFile.ino)
    return audioFile.updateFromScan(updatedAudioFile)
  }

  addOtherFile(fileData) {
    var file = new AudiobookFile()
    file.setData(fileData)
    this.otherFiles.push(file)
    return file
  }

  update(payload) {
    var hasUpdates = false
    if (payload.tags && payload.tags.join(',') !== this.tags.join(',')) {
      this.tags = payload.tags
      hasUpdates = true
    }

    if (payload.book && this.book.update(payload.book)) {
      hasUpdates = true
    }

    if (hasUpdates) {
      this.lastUpdate = Date.now()
    }

    return hasUpdates
  }

  // Cover Url may be the same, this ensures the lastUpdate is updated
  updateBookCover(cover, coverFullPath) {
    if (!this.book) return false
    return this.book.updateCover(cover, coverFullPath)
  }

  checkHasTrackNum(trackNum, excludeIno) {
    return this._audioFiles.find(t => t.index === trackNum && t.ino !== excludeIno)
  }

  updateAudioTracks(orderedFileData) {
    var index = 1
    this.audioFiles = orderedFileData.map((fileData) => {
      var audioFile = this.audioFiles.find(af => af.ino === fileData.ino)
      audioFile.manuallyVerified = true
      audioFile.invalid = false
      audioFile.error = null
      if (fileData.exclude !== undefined) {
        audioFile.exclude = !!fileData.exclude
      }
      if (audioFile.exclude) {
        audioFile.index = -1
      } else {
        audioFile.index = index++
      }
      return audioFile
    })

    this.rebuildTracks()
  }

  // After audio files have been added/removed/updated this method sets tracks
  rebuildTracks() {
    this.audioFiles.sort((a, b) => a.index - b.index)
    this.tracks = []
    this.missingParts = []
    this.audioFiles.forEach((file) => {
      if (!file.exclude) {
        this.addTrack(file)
      }
    })
    this.setChapters()
    this.checkUpdateMissingTracks()
    this.lastUpdate = Date.now()
  }

  removeAudioFile(audioFile) {
    this.tracks = this.tracks.filter(t => t.ino !== audioFile.ino)
    this.audioFiles = this.audioFiles.filter(f => f.ino !== audioFile.ino)
  }

  removeAudioTrack(track) {
    this.tracks = this.tracks.filter(t => t.ino !== track.ino)
    this.audioFiles = this.audioFiles.filter(f => f.ino !== track.ino)
  }

  checkUpdateMissingTracks() {
    var currMissingParts = (this.missingParts || []).join(',') || ''

    var current_index = 1
    var missingParts = []

    for (let i = 0; i < this.tracks.length; i++) {
      var _track = this.tracks[i]
      if (_track.index > current_index) {
        var num_parts_missing = _track.index - current_index
        for (let x = 0; x < num_parts_missing && x < 9999; x++) {
          missingParts.push(current_index + x)
        }
      }
      current_index = _track.index + 1
    }

    this.missingParts = missingParts

    var newMissingParts = (this.missingParts || []).join(',') || ''
    var wasUpdated = newMissingParts !== currMissingParts
    if (wasUpdated && this.missingParts.length) {
      Logger.info(`[Audiobook] "${this.title}" has ${missingParts.length} missing parts`)
    }

    return wasUpdated
  }

  // On scan check other files found with other files saved
  async syncOtherFiles(newOtherFiles, opfMetadataOverrideDetails) {
    var hasUpdates = false

    var currOtherFileNum = this.otherFiles.length

    var otherFilenamesAlreadyInBook = this.otherFiles.map(ofile => ofile.filename)
    var alreadyHasAbsMetadata = otherFilenamesAlreadyInBook.includes('metadata.abs')
    var alreadyHasDescTxt = otherFilenamesAlreadyInBook.includes('desc.txt')
    var alreadyHasReaderTxt = otherFilenamesAlreadyInBook.includes('reader.txt')

    // Filter out other files no longer in directory
    var newOtherFilePaths = newOtherFiles.map(f => f.path)
    this.otherFiles = this.otherFiles.filter(f => newOtherFilePaths.includes(f.path))
    if (currOtherFileNum !== this.otherFiles.length) {
      Logger.debug(`[Audiobook] ${currOtherFileNum - this.otherFiles.length} other files were removed for "${this.title}"`)
      hasUpdates = true
    }

    // If desc.txt is new then read it and update description (will overwrite)
    var descriptionTxt = newOtherFiles.find(file => file.filename === 'desc.txt')
    if (descriptionTxt && !alreadyHasDescTxt) {
      var newDescription = await readTextFile(descriptionTxt.fullPath)
      if (newDescription) {
        Logger.debug(`[Audiobook] Sync Other File desc.txt: ${newDescription}`)
        this.update({ book: { description: newDescription } })
        hasUpdates = true
      }
    }
    // If reader.txt is new then read it and update narrator (will overwrite)
    var readerTxt = newOtherFiles.find(file => file.filename === 'reader.txt')
    if (readerTxt && !alreadyHasReaderTxt) {
      var newReader = await readTextFile(readerTxt.fullPath)
      if (newReader) {
        Logger.debug(`[Audiobook] Sync Other File reader.txt: ${newReader}`)
        this.update({ book: { narrator: newReader } })
        hasUpdates = true
      }
    }


    // If metadata.abs is new then read it and set all defined keys (will overwrite)
    var metadataAbs = newOtherFiles.find(file => file.filename === 'metadata.abs')
    if (metadataAbs && !alreadyHasAbsMetadata) {
      var abmetadataText = await readTextFile(metadataAbs.fullPath)
      if (abmetadataText) {
        var metadataUpdateObject = abmetadataGenerator.parse(abmetadataText)
        if (metadataUpdateObject && metadataUpdateObject.book) {
          if (this.update(metadataUpdateObject)) {
            Logger.debug(`[Audiobook] Some details were updated from metadata.abs for "${this.title}"`, metadataUpdateObject)
            hasUpdates = true
          }
        }
      }
    }

    // If OPF file and was not already there OR prefer opf metadata
    var metadataOpf = newOtherFiles.find(file => file.ext === '.opf' || file.filename === 'metadata.xml')
    if (metadataOpf && (!otherFilenamesAlreadyInBook.includes(metadataOpf.filename) || opfMetadataOverrideDetails)) {
      var xmlText = await readTextFile(metadataOpf.fullPath)
      if (xmlText) {
        var opfMetadata = await parseOpfMetadataXML(xmlText)
        // Logger.debug(`[Audiobook] Sync Other File "${metadataOpf.filename}" parsed:`, opfMetadata)
        if (opfMetadata) {
          const bookUpdatePayload = {}
          for (const key in opfMetadata) {
            // Add genres only if genres are empty
            if (key === 'genres') {
              if (opfMetadata.genres.length && (!this.book._genres.length || opfMetadataOverrideDetails)) {
                bookUpdatePayload[key] = opfMetadata.genres
              }
            } else if (opfMetadata[key] && (!this.book[key] || opfMetadataOverrideDetails)) {
              bookUpdatePayload[key] = opfMetadata[key]
            }
          }
          if (Object.keys(bookUpdatePayload).length) {
            Logger.debug(`[Audiobook] Using data found in OPF "${metadataOpf.filename}"`, bookUpdatePayload)
            this.update({ book: bookUpdatePayload })
            hasUpdates = true
          }
        }
      }
    }

    newOtherFiles.forEach((file) => {
      var existingOtherFile = this.otherFiles.find(f => f.ino === file.ino)
      if (!existingOtherFile) {
        Logger.debug(`[Audiobook] New other file found on sync ${file.filename} | "${this.title}"`)
        this.addOtherFile(file)
        hasUpdates = true
      }
    })

    var imageFiles = this.otherFiles.filter(f => f.filetype === 'image')

    // OLD Path Check if cover was a local image and that it still exists
    if (this.book.cover && this.book.cover.substr(1).startsWith('local')) {
      var coverStripped = this.book.cover.substr('/local/'.length)
      // Check if was removed first
      var coverStillExists = imageFiles.find(f => comparePaths(f.path, coverStripped))
      if (!coverStillExists) {
        Logger.info(`[Audiobook] Local cover was removed | "${this.title}"`)
        this.book.removeCover()
      } else {
        var oldFormat = this.book.cover

        // Update book cover path to new format
        this.book.coverFullPath = Path.join(this.fullPath, this.book.cover.substr(7)).replace(/\\/g, '/')
        this.book.cover = coverStripped.replace(this.path, `/s/book/${this.id}`)
        Logger.debug(`[Audiobook] updated book cover to new format "${oldFormat}" => "${this.book.cover}"`)
      }
      hasUpdates = true
    }

    // Check if book was removed from book dir
    var bookCoverPath = this.book.cover ? this.book.cover.replace(/\\/g, '/') : null
    if (bookCoverPath && bookCoverPath.startsWith('/s/book/')) {
      // Fixing old cover paths
      if (!this.book.coverFullPath) {
        this.book.coverFullPath = Path.join(this.fullPath, this.book.cover.substr(`/s/book/${this.id}`.length)).replace(/\\/g, '/').replace(/\/\//g, '/')
        Logger.debug(`[Audiobook] Metadata cover full path set "${this.book.coverFullPath}" for "${this.title}"`)
        hasUpdates = true
      }

      var coverStillExists = imageFiles.find(f => comparePaths(f.fullPath, this.book.coverFullPath))
      if (!coverStillExists) {
        Logger.info(`[Audiobook] Local cover "${this.book.cover}" was removed | "${this.title}"`)
        this.book.removeCover()
        hasUpdates = true
      }
    }

    if (bookCoverPath && bookCoverPath.startsWith('/metadata')) {
      // Fixing old cover paths
      if (!this.book.coverFullPath) {
        this.book.coverFullPath = Path.join(global.MetadataPath, this.book.cover.substr('/metadata/'.length)).replace(/\\/g, '/').replace(/\/\//g, '/')
        Logger.debug(`[Audiobook] Metadata cover full path set "${this.book.coverFullPath}" for "${this.title}"`)
        hasUpdates = true
      }
      // metadata covers are stored in /<MetadataPath>/books/:id/
      if (!await fs.pathExists(this.book.coverFullPath)) {
        Logger.info(`[Audiobook] Cover in /metadata for "${this.title}" no longer exists - removing cover paths`)
        this.book.removeCover()
        hasUpdates = true
      }
    }

    if (this.book.cover && !this.book.coverFullPath) {
      if (this.book.cover.startsWith('http')) {
        Logger.debug(`[Audiobook] Still using http path for cover "${this.book.cover}" - should update to local`)
        this.book.coverFullPath = this.book.cover
        hasUpdates = true
      } else {
        Logger.warn(`[Audiobook] Full cover path still not set "${this.book.cover}"`)
      }
    }

    // If no cover set and image file exists then use it
    if (!this.book.cover && imageFiles.length) {
      var imagePathRelativeToBook = imageFiles[0].path.replace(this.path, '')
      this.book.cover = Path.posix.join(`/s/book/${this.id}`, imagePathRelativeToBook)
      this.book.coverFullPath = imageFiles[0].fullPath
      Logger.info(`[Audiobook] Local cover was set to "${this.book.cover}" | "${this.title}"`)
      hasUpdates = true
    }

    return hasUpdates
  }

  syncAudioFile(audioFile, fileScanData) {
    var hasUpdates = audioFile.syncFile(fileScanData)
    var track = this.tracks.find(t => t.ino === audioFile.ino)
    if (track && track.syncFile(fileScanData)) {
      hasUpdates = true
    }
    return hasUpdates
  }

  syncPaths(audiobookData) {
    var hasUpdates = false
    var keysToSync = ['path', 'fullPath']
    keysToSync.forEach((key) => {
      if (audiobookData[key] !== undefined && audiobookData[key] !== this[key]) {
        hasUpdates = true
        this[key] = audiobookData[key]
      }
    })
    if (hasUpdates) {
      this.book.syncPathsUpdated(audiobookData)
    }
    return hasUpdates
  }

  isSearchMatch(search) {
    var tagMatch = this.tags.filter(tag => {
      return tag.toLowerCase().includes(search.toLowerCase().trim())
    })
    return this.book.isSearchMatch(search.toLowerCase().trim()) || tagMatch.length
  }

  searchQuery(search) {
    var matches = this.book.getQueryMatches(search.toLowerCase().trim())
    matches.tags = this.tags.filter(tag => {
      return tag.toLowerCase().includes(search.toLowerCase().trim())
    })
    if (!matches.book && matches.tags.length) {
      matches.book = 'tags'
      matches.bookMatchText = matches.tags.join(', ')
    }
    return matches
  }

  getAudioFileByIno(ino) {
    return this.audioFiles.find(af => af.ino === ino)
  }

  getAudioFileByPath(fullPath) {
    return this.audioFiles.find(af => af.fullPath === fullPath)
  }

  setChapters() {
    // If 1 audio file without chapters, then no chapters will be set
    var includedAudioFiles = this.audioFiles.filter(af => !af.exclude)
    if (includedAudioFiles.length === 1) {
      // 1 audio file with chapters
      if (includedAudioFiles[0].chapters) {
        this.chapters = includedAudioFiles[0].chapters.map(c => ({ ...c }))
      }
    } else {
      this.chapters = []
      var currChapterId = 0
      var currStartTime = 0
      includedAudioFiles.forEach((file) => {
        // If audio file has chapters use chapters
        if (file.chapters && file.chapters.length) {
          file.chapters.forEach((chapter) => {
            var chapterDuration = chapter.end - chapter.start
            if (chapterDuration > 0) {
              var title = `Chapter ${currChapterId}`
              if (chapter.title) {
                title += ` (${chapter.title})`
              }
              this.chapters.push({
                id: currChapterId++,
                start: currStartTime,
                end: currStartTime + chapterDuration,
                title
              })
              currStartTime += chapterDuration
            }
          })
        } else if (file.duration) {
          // Otherwise just use track has chapter
          this.chapters.push({
            id: currChapterId++,
            start: currStartTime,
            end: currStartTime + file.duration,
            title: file.filename ? Path.basename(file.filename, Path.extname(file.filename)) : `Chapter ${currChapterId}`
          })
          currStartTime += file.duration
        }
      })
    }
  }

  writeNfoFile(nfoFilename = 'metadata.nfo') {
    return nfoGenerator(this, nfoFilename)
  }

  // Return cover filename
  async saveEmbeddedCoverArt(coverDirFullPath, coverDirRelPath) {
    var audioFileWithCover = this.audioFiles.find(af => af.embeddedCoverArt)
    if (!audioFileWithCover) return false

    var coverFilename = audioFileWithCover.embeddedCoverArt === 'png' ? 'cover.png' : 'cover.jpg'
    var coverFilePath = Path.join(coverDirFullPath, coverFilename)

    var coverAlreadyExists = await fs.pathExists(coverFilePath)
    if (coverAlreadyExists) {
      Logger.warn(`[Audiobook] Extract embedded cover art but cover already exists for "${this.title}" - bail`)
      return false
    }

    var success = await extractCoverArt(audioFileWithCover.fullPath, coverFilePath)
    if (success) {
      var coverRelPath = Path.join(coverDirRelPath, coverFilename).replace(/\\/g, '/').replace(/\/\//g, '/')
      this.update({ book: { cover: coverRelPath, coverFullPath: audioFileWithCover.fullPath } })
      return coverRelPath
    }
    return false
  }

  // Look for desc.txt, reader.txt, metadata.abs and opf file then update details if found
  async saveDataFromTextFiles(opfMetadataOverrideDetails) {
    var bookUpdatePayload = {}

    var descriptionText = await this.fetchTextFromTextFile('desc.txt')
    if (descriptionText) {
      Logger.debug(`[Audiobook] "${this.title}" found desc.txt updating description with "${descriptionText.slice(0, 20)}..."`)
      bookUpdatePayload.description = descriptionText
    }
    var readerText = await this.fetchTextFromTextFile('reader.txt')
    if (readerText) {
      Logger.debug(`[Audiobook] "${this.title}" found reader.txt updating narrator with "${readerText}"`)
      bookUpdatePayload.narrator = readerText
    }

    // abmetadata will always overwrite
    var abmetadataText = await this.fetchTextFromTextFile('metadata.abs')
    if (abmetadataText) {
      var metadataUpdateObject = abmetadataGenerator.parse(abmetadataText)
      if (metadataUpdateObject && metadataUpdateObject.book) {
        Logger.debug(`[Audiobook] "${this.title}" found metadata.abs file`)
        for (const key in metadataUpdateObject.book) {
          var value = metadataUpdateObject.book[key]
          if (key && value !== undefined) {
            bookUpdatePayload[key] = value
          }
        }
      }
    }

    // Opf only overwrites if detail is empty
    var metadataOpf = this.otherFiles.find(file => file.isOPFFile || file.filename === 'metadata.xml')
    if (metadataOpf) {
      var xmlText = await readTextFile(metadataOpf.fullPath)
      if (xmlText) {
        var opfMetadata = await parseOpfMetadataXML(xmlText)
        // Logger.debug(`[Audiobook] "${this.title}" found "${metadataOpf.filename}" parsed:`, opfMetadata)
        if (opfMetadata) {
          for (const key in opfMetadata) {
            // Add genres only if genres are empty
            if (key === 'genres') {
              if (opfMetadata.genres.length && (!this.book._genres.length || opfMetadataOverrideDetails)) {
                bookUpdatePayload[key] = opfMetadata.genres
              }
            } else if (opfMetadata[key] && ((!this.book[key] && !bookUpdatePayload[key]) || opfMetadataOverrideDetails)) {
              bookUpdatePayload[key] = opfMetadata[key]
            }
          }
        }
      }
    }

    if (Object.keys(bookUpdatePayload).length) {
      return this.update({ book: bookUpdatePayload })
    }
    return false
  }

  fetchTextFromTextFile(textfileName) {
    var textFile = this.otherFiles.find(file => file.filename === textfileName)
    if (!textFile) return false
    return readTextFile(textFile.fullPath)
  }

  // Audio file metadata tags map to book details (will not overwrite)
  setDetailsFromFileMetadata(overrideExistingDetails = false) {
    if (!this.audioFiles.length) return false
    var audioFile = this.audioFiles[0]
    return this.book.setDetailsFromFileMetadata(audioFile.metadata, overrideExistingDetails)
  }

  // Returns null if file not found, true if file was updated, false if up to date
  checkFileFound(fileFound, isAudioFile) {
    var hasUpdated = false

    const arrayToCheck = isAudioFile ? this.audioFiles : this.otherFiles

    var existingFile = arrayToCheck.find(_af => _af.ino === fileFound.ino)
    if (!existingFile) {
      existingFile = arrayToCheck.find(_af => _af.path === fileFound.path)
      if (existingFile) {
        // file inode was updated
        existingFile.ino = fileFound.ino
        hasUpdated = true
      } else {
        // file not found
        return null
      }
    }

    if (existingFile.filename !== fileFound.filename) {
      existingFile.filename = fileFound.filename
      existingFile.ext = fileFound.ext
      hasUpdated = true
    }

    if (existingFile.path !== fileFound.path) {
      existingFile.path = fileFound.path
      existingFile.fullPath = fileFound.fullPath
      hasUpdated = true
    } else if (existingFile.fullPath !== fileFound.fullPath) {
      existingFile.fullPath = fileFound.fullPath
      hasUpdated = true
    }

    if (!isAudioFile && existingFile.filetype !== fileFound.filetype) {
      existingFile.filetype = fileFound.filetype
      hasUpdated = true
    }

    return hasUpdated
  }

  checkScanData(dataFound, version) {
    var hasUpdated = false

    if (this.isMissing) {
      // Audiobook no longer missing
      this.isMissing = false
      hasUpdated = true
    }

    if (dataFound.ino !== this.ino) {
      this.ino = dataFound.ino
      hasUpdated = true
    }

    if (dataFound.folderId !== this.folderId) {
      Logger.warn(`[Audiobook] Check scan audiobook changed folder ${this.folderId} -> ${dataFound.folderId}`)
      this.folderId = dataFound.folderId
      hasUpdated = true
    }

    if (dataFound.path !== this.path) {
      Logger.warn(`[Audiobook] Check scan audiobook changed path "${this.path}" -> "${dataFound.path}"`)
      this.path = dataFound.path
      this.fullPath = dataFound.fullPath
      hasUpdated = true
    } else if (dataFound.fullPath !== this.fullPath) {
      Logger.warn(`[Audiobook] Check scan audiobook changed fullpath "${this.fullPath}" -> "${dataFound.fullPath}"`)
      this.fullPath = dataFound.fullPath
      hasUpdated = true
    }

    var newAudioFileData = []
    var newOtherFileData = []
    var existingAudioFileData = []
    var existingOtherFileData = []

    dataFound.audioFiles.forEach((af) => {
      var audioFileFoundCheck = this.checkFileFound(af, true)
      if (audioFileFoundCheck === null) {
        newAudioFileData.push(af)
      } else if (audioFileFoundCheck) {
        hasUpdated = true
        existingAudioFileData.push(af)
      } else {
        existingAudioFileData.push(af)
      }
    })

    dataFound.otherFiles.forEach((otherFileData) => {
      var fileFoundCheck = this.checkFileFound(otherFileData, false)
      if (fileFoundCheck === null) {
        newOtherFileData.push(otherFileData)
      } else if (fileFoundCheck) {
        hasUpdated = true
        existingOtherFileData.push(otherFileData)
      } else {
        existingOtherFileData.push(otherFileData)
      }
    })

    const audioFilesRemoved = []
    const otherFilesRemoved = []

    // Remove audio files not found (inodes will all be up to date at this point)
    this.audioFiles = this.audioFiles.filter(af => {
      if (!dataFound.audioFiles.find(_af => _af.ino === af.ino)) {
        audioFilesRemoved.push(af.toJSON())
        return false
      }
      return true
    })

    // Remove all tracks that were associated with removed audio files
    if (audioFilesRemoved.length) {
      const audioFilesRemovedInodes = audioFilesRemoved.map(afr => afr.ino)
      this.tracks = this.tracks.filter(t => !audioFilesRemovedInodes.includes(t.ino))
      this.checkUpdateMissingTracks()
      hasUpdated = true
    }

    // Remove other files not found
    this.otherFiles = this.otherFiles.filter(otherFile => {
      if (!dataFound.otherFiles.find(_otherFile => _otherFile.ino === otherFile.ino)) {
        otherFilesRemoved.push(otherFile.toJSON())

        // Check remove cover
        if (otherFile.fullPath === this.book.coverFullPath) {
          Logger.debug(`[Audiobook] "${this.title}" Check scan book cover removed`)
          this.book.removeCover()
        }

        return false
      }
      return true
    })

    if (otherFilesRemoved.length) {
      hasUpdated = true
    }

    // Check if invalid (has no audio files or ebooks)
    if (!this.audioFilesToInclude.length && !this.ebooks.length && !newAudioFileData.length && !newOtherFileData.length) {
      this.isInvalid = true
    }

    if (hasUpdated) {
      this.setLastScan(version)
    }

    return {
      updated: hasUpdated,
      newAudioFileData,
      newOtherFileData,
      audioFilesRemoved,
      otherFilesRemoved,
      existingAudioFileData, // Existing file data may get re-scanned if forceRescan is set
      existingOtherFileData
    }
  }

  // Temp fix for cover is set but coverFullPath is not set
  fixFullCoverPath() {
    if (!this.book.cover) return
    var bookCoverPath = this.book.cover.replace(/\\/g, '/')
    var newFullCoverPath = null
    if (bookCoverPath.startsWith('/s/book/')) {
      newFullCoverPath = Path.join(this.fullPath, bookCoverPath.substr(`/s/book/${this.id}`.length)).replace(/\/\//g, '/')
    } else if (bookCoverPath.startsWith('/metadata/')) {
      newFullCoverPath = Path.join(global.MetadataPath, bookCoverPath.substr('/metadata/'.length)).replace(/\/\//g, '/')
    }
    if (newFullCoverPath) {
      Logger.debug(`[Audiobook] "${this.title}" fixing full cover path "${this.book.cover}" => "${newFullCoverPath}"`)
      this.update({ book: { fullCoverPath: newFullCoverPath } })
      return true
    }
    return false
  }

  async saveAbMetadata() {
    if (this.isSavingMetadata) return
    this.isSavingMetadata = true

    var metadataPath = Path.join(global.MetadataPath, 'books', this.id)
    if (global.ServerSettings.storeMetadataWithBook) {
      metadataPath = this.fullPath
    } else {
      // Make sure metadata book dir exists
      await fs.ensureDir(metadataPath)
    }
    metadataPath = Path.join(metadataPath, 'metadata.abs')

    return abmetadataGenerator.generate(this, metadataPath).then((success) => {
      this.isSavingMetadata = false
      if (!success) Logger.error(`[Audiobook] Failed saving abmetadata to "${metadataPath}"`)
      else Logger.debug(`[Audiobook] Success saving abmetadata to "${metadataPath}"`)
      return success
    })
  }
}
module.exports = Audiobook