const fs = require('../libs/fsExtra')
const Path = require('path')
const Logger = require('../Logger')
const LibraryFile = require('./files/LibraryFile')
const Book = require('./mediaTypes/Book')
const Podcast = require('./mediaTypes/Podcast')
const { areEquivalent, copyValue } = require('../utils/index')
const { filePathToPOSIX, getFileTimestampsWithIno } = require('../utils/fileUtils')

class LibraryItem {
  constructor(libraryItem = null) {
    this.id = null
    this.ino = null // Inode
    this.oldLibraryItemId = null

    this.libraryId = null
    this.folderId = null

    this.path = null
    this.relPath = null
    this.isFile = false
    this.mtimeMs = null
    this.ctimeMs = null
    this.birthtimeMs = null
    this.addedAt = null
    this.updatedAt = null
    this.lastScan = null
    this.scanVersion = null

    // Was scanned and no longer exists
    this.isMissing = false
    // Was scanned and no longer has media files
    this.isInvalid = false

    this.mediaType = null
    this.media = null

    /** @type {LibraryFile[]} */
    this.libraryFiles = []

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

    // Temporary attributes
    this.isSavingMetadata = false
  }

  construct(libraryItem) {
    this.id = libraryItem.id
    this.ino = libraryItem.ino || null
    this.oldLibraryItemId = libraryItem.oldLibraryItemId
    this.libraryId = libraryItem.libraryId
    this.folderId = libraryItem.folderId
    this.path = libraryItem.path
    this.relPath = libraryItem.relPath
    this.isFile = !!libraryItem.isFile
    this.mtimeMs = libraryItem.mtimeMs || 0
    this.ctimeMs = libraryItem.ctimeMs || 0
    this.birthtimeMs = libraryItem.birthtimeMs || 0
    this.addedAt = libraryItem.addedAt
    this.updatedAt = libraryItem.updatedAt || this.addedAt
    this.lastScan = libraryItem.lastScan || null
    this.scanVersion = libraryItem.scanVersion || null

    this.isMissing = !!libraryItem.isMissing
    this.isInvalid = !!libraryItem.isInvalid

    this.mediaType = libraryItem.mediaType
    if (this.mediaType === 'book') {
      this.media = new Book(libraryItem.media)
    } else if (this.mediaType === 'podcast') {
      this.media = new Podcast(libraryItem.media)
    }
    this.media.libraryItemId = this.id

    this.libraryFiles = libraryItem.libraryFiles.map((f) => new LibraryFile(f))

    // Migration for v2.2.23 to set ebook library files as supplementary
    if (this.isBook && this.media.ebookFile) {
      for (const libraryFile of this.libraryFiles) {
        if (libraryFile.isEBookFile && libraryFile.isSupplementary === null) {
          libraryFile.isSupplementary = this.media.ebookFile.ino !== libraryFile.ino
        }
      }
    }
  }

  toJSON() {
    return {
      id: this.id,
      ino: this.ino,
      oldLibraryItemId: this.oldLibraryItemId,
      libraryId: this.libraryId,
      folderId: this.folderId,
      path: this.path,
      relPath: this.relPath,
      isFile: this.isFile,
      mtimeMs: this.mtimeMs,
      ctimeMs: this.ctimeMs,
      birthtimeMs: this.birthtimeMs,
      addedAt: this.addedAt,
      updatedAt: this.updatedAt,
      lastScan: this.lastScan,
      scanVersion: this.scanVersion,
      isMissing: !!this.isMissing,
      isInvalid: !!this.isInvalid,
      mediaType: this.mediaType,
      media: this.media.toJSON(),
      libraryFiles: this.libraryFiles.map((f) => f.toJSON())
    }
  }

  toJSONMinified() {
    return {
      id: this.id,
      ino: this.ino,
      oldLibraryItemId: this.oldLibraryItemId,
      libraryId: this.libraryId,
      folderId: this.folderId,
      path: this.path,
      relPath: this.relPath,
      isFile: this.isFile,
      mtimeMs: this.mtimeMs,
      ctimeMs: this.ctimeMs,
      birthtimeMs: this.birthtimeMs,
      addedAt: this.addedAt,
      updatedAt: this.updatedAt,
      isMissing: !!this.isMissing,
      isInvalid: !!this.isInvalid,
      mediaType: this.mediaType,
      media: this.media.toJSONMinified(),
      numFiles: this.libraryFiles.length,
      size: this.size
    }
  }

  get isPodcast() {
    return this.mediaType === 'podcast'
  }
  get isBook() {
    return this.mediaType === 'book'
  }
  get size() {
    let total = 0
    this.libraryFiles.forEach((lf) => (total += lf.metadata.size))
    return total
  }
  get hasAudioFiles() {
    return this.libraryFiles.some((lf) => lf.fileType === 'audio')
  }
}
module.exports = LibraryItem