import { SortMeta } from 'primeng/api'
import { from, Observable, of } from 'rxjs'
import { catchError, concatMap, filter, first, map, shareReplay, tap, throttleTime, toArray } from 'rxjs/operators'
import { HttpClient, HttpParams } from '@angular/common/http'
import { Injectable } from '@angular/core'
import { AuthService } from '@app/core/auth'
import { getBytes } from '@root-helpers/bytes'
import { UserLocalStorageKeys } from '@root-helpers/users'
import {
  ActorImage,
  ResultList,
  User as UserServerModel,
  UserCreate,
  UserRegister,
  UserRole,
  UserUpdate,
  UserUpdateMe,
  UserVideoQuota
} from '@shared/models'
import { ServerService } from '../'
import { environment } from '../../../environments/environment'
import { RestExtractor, RestPagination, RestService } from '../rest'
import { LocalStorageService, SessionStorageService } from '../wrappers/storage.service'
import { User } from './user.model'

@Injectable()
export class UserService {
  static BASE_USERS_URL = environment.apiUrl + '/api/v1/users/'

  private userCache: { [ id: number ]: Observable<UserServerModel> } = {}

  private signupInThisSession = false

  constructor (
    private authHttp: HttpClient,
    private server: ServerService,
    private authService: AuthService,
    private restExtractor: RestExtractor,
    private restService: RestService,
    private localStorageService: LocalStorageService,
    private sessionStorageService: SessionStorageService
  ) { }

  hasSignupInThisSession () {
    return this.signupInThisSession
  }

  changePassword (currentPassword: string, newPassword: string) {
    const url = UserService.BASE_USERS_URL + 'me'
    const body: UserUpdateMe = {
      currentPassword,
      password: newPassword
    }

    return this.authHttp.put(url, body)
               .pipe(
                 map(this.restExtractor.extractDataBool),
                 catchError(err => this.restExtractor.handleError(err))
               )
  }

  changeEmail (password: string, newEmail: string) {
    const url = UserService.BASE_USERS_URL + 'me'
    const body: UserUpdateMe = {
      currentPassword: password,
      email: newEmail
    }

    return this.authHttp.put(url, body)
               .pipe(
                 map(this.restExtractor.extractDataBool),
                 catchError(err => this.restExtractor.handleError(err))
               )
  }

  updateMyProfile (profile: UserUpdateMe) {
    const url = UserService.BASE_USERS_URL + 'me'

    return this.authHttp.put(url, profile)
               .pipe(
                 map(this.restExtractor.extractDataBool),
                 catchError(err => this.restExtractor.handleError(err))
               )
  }

  updateMyAnonymousProfile (profile: UserUpdateMe) {
    const localStorageKeys: { [ id in keyof UserUpdateMe ]: string } = {
      nsfwPolicy: UserLocalStorageKeys.NSFW_POLICY,
      webTorrentEnabled: UserLocalStorageKeys.WEBTORRENT_ENABLED,
      autoPlayNextVideo: UserLocalStorageKeys.AUTO_PLAY_VIDEO,
      autoPlayNextVideoPlaylist: UserLocalStorageKeys.AUTO_PLAY_VIDEO_PLAYLIST,
      theme: UserLocalStorageKeys.THEME,
      videoLanguages: UserLocalStorageKeys.VIDEO_LANGUAGES
    }

    const obj = Object.keys(localStorageKeys)
      .filter(key => key in profile)
      .map(key => ([ localStorageKeys[key], profile[key] ]))

    for (const [ key, value ] of obj) {
      try {
        if (value === undefined) {
          this.localStorageService.removeItem(key)
          continue
        }

        const localStorageValue = typeof value === 'string'
          ? value
          : JSON.stringify(value)

        this.localStorageService.setItem(key, localStorageValue)
      } catch (err) {
        console.error(`Cannot set ${key}->${value} in localStorage. Likely due to a value impossible to stringify.`, err)
      }
    }
  }

  listenAnonymousUpdate () {
    return this.localStorageService.watch([
      UserLocalStorageKeys.NSFW_POLICY,
      UserLocalStorageKeys.WEBTORRENT_ENABLED,
      UserLocalStorageKeys.AUTO_PLAY_VIDEO,
      UserLocalStorageKeys.AUTO_PLAY_VIDEO_PLAYLIST,
      UserLocalStorageKeys.THEME,
      UserLocalStorageKeys.VIDEO_LANGUAGES
    ]).pipe(
      throttleTime(200),
      filter(() => this.authService.isLoggedIn() !== true),
      map(() => this.getAnonymousUser())
    )
  }

  deleteMe () {
    const url = UserService.BASE_USERS_URL + 'me'

    return this.authHttp.delete(url)
               .pipe(
                 map(this.restExtractor.extractDataBool),
                 catchError(err => this.restExtractor.handleError(err))
               )
  }

  changeAvatar (avatarForm: FormData) {
    const url = UserService.BASE_USERS_URL + 'me/avatar/pick'

    return this.authHttp.post<{ avatar: ActorImage }>(url, avatarForm)
               .pipe(catchError(err => this.restExtractor.handleError(err)))
  }

  deleteAvatar () {
    const url = UserService.BASE_USERS_URL + 'me/avatar'

    return this.authHttp.delete(url)
               .pipe(
                 map(this.restExtractor.extractDataBool),
                 catchError(err => this.restExtractor.handleError(err))
               )
  }

  signup (userCreate: UserRegister) {
    return this.authHttp.post(UserService.BASE_USERS_URL + 'register', userCreate)
               .pipe(
                 map(this.restExtractor.extractDataBool),
                 tap(() => this.signupInThisSession = true),
                 catchError(err => this.restExtractor.handleError(err))
               )
  }

  getMyVideoQuotaUsed () {
    const url = UserService.BASE_USERS_URL + 'me/video-quota-used'

    return this.authHttp.get<UserVideoQuota>(url)
               .pipe(catchError(err => this.restExtractor.handleError(err)))
  }

  askResetPassword (email: string) {
    const url = UserService.BASE_USERS_URL + '/ask-reset-password'

    return this.authHttp.post(url, { email })
               .pipe(
                 map(this.restExtractor.extractDataBool),
                 catchError(err => this.restExtractor.handleError(err))
               )
  }

  resetPassword (userId: number, verificationString: string, password: string) {
    const url = `${UserService.BASE_USERS_URL}/${userId}/reset-password`
    const body = {
      verificationString,
      password
    }

    return this.authHttp.post(url, body)
               .pipe(
                 map(this.restExtractor.extractDataBool),
                 catchError(res => this.restExtractor.handleError(res))
               )
  }

  verifyEmail (userId: number, verificationString: string, isPendingEmail: boolean) {
    const url = `${UserService.BASE_USERS_URL}/${userId}/verify-email`
    const body = {
      verificationString,
      isPendingEmail
    }

    return this.authHttp.post(url, body)
               .pipe(
                 map(this.restExtractor.extractDataBool),
                 catchError(res => this.restExtractor.handleError(res))
               )
  }

  askSendVerifyEmail (email: string) {
    const url = UserService.BASE_USERS_URL + '/ask-send-verify-email'

    return this.authHttp.post(url, { email })
               .pipe(
                 map(this.restExtractor.extractDataBool),
                 catchError(err => this.restExtractor.handleError(err))
               )
  }

  autocomplete (search: string): Observable<string[]> {
    const url = UserService.BASE_USERS_URL + 'autocomplete'
    const params = new HttpParams().append('search', search)

    return this.authHttp
      .get<string[]>(url, { params })
      .pipe(catchError(res => this.restExtractor.handleError(res)))
  }

  getNewUsername (oldDisplayName: string, newDisplayName: string, currentUsername: string) {
    // Don't update display name, the user seems to have changed it
    if (this.displayNameToUsername(oldDisplayName) !== currentUsername) return currentUsername

    return this.displayNameToUsername(newDisplayName)
  }

  displayNameToUsername (displayName: string) {
    if (!displayName) return ''

    return displayName
      .toLowerCase()
      .replace(/\s/g, '_')
      .replace(/[^a-z0-9_.]/g, '')
  }

  /* ###### Admin methods ###### */

  addUser (userCreate: UserCreate) {
    return this.authHttp.post(UserService.BASE_USERS_URL, userCreate)
               .pipe(
                 map(this.restExtractor.extractDataBool),
                 catchError(err => this.restExtractor.handleError(err))
               )
  }

  updateUser (userId: number, userUpdate: UserUpdate) {
    return this.authHttp.put(UserService.BASE_USERS_URL + userId, userUpdate)
               .pipe(
                 map(this.restExtractor.extractDataBool),
                 catchError(err => this.restExtractor.handleError(err))
               )
  }

  updateUsers (users: UserServerModel[], userUpdate: UserUpdate) {
    return from(users)
      .pipe(
        concatMap(u => this.authHttp.put(UserService.BASE_USERS_URL + u.id, userUpdate)),
        toArray(),
        catchError(err => this.restExtractor.handleError(err))
      )
  }

  getUserWithCache (userId: number) {
    if (!this.userCache[userId]) {
      this.userCache[userId] = this.getUser(userId).pipe(shareReplay())
    }

    return this.userCache[userId]
  }

  getUser (userId: number, withStats = false) {
    const params = new HttpParams().append('withStats', withStats + '')
    return this.authHttp.get<UserServerModel>(UserService.BASE_USERS_URL + userId, { params })
               .pipe(catchError(err => this.restExtractor.handleError(err)))
  }

  getAnonymousUser () {
    let videoLanguages: string[]

    try {
      const languagesString = this.localStorageService.getItem(UserLocalStorageKeys.VIDEO_LANGUAGES)
      videoLanguages = languagesString && languagesString !== 'undefined'
        ? JSON.parse(languagesString)
        : null
    } catch (err) {
      videoLanguages = null
      console.error('Cannot parse desired video languages from localStorage.', err)
    }

    const defaultNSFWPolicy = this.server.getHTMLConfig().instance.defaultNSFWPolicy

    return new User({
      // local storage keys
      nsfwPolicy: this.localStorageService.getItem(UserLocalStorageKeys.NSFW_POLICY) || defaultNSFWPolicy,
      webTorrentEnabled: this.localStorageService.getItem(UserLocalStorageKeys.WEBTORRENT_ENABLED) !== 'false',
      theme: this.localStorageService.getItem(UserLocalStorageKeys.THEME) || 'instance-default',
      videoLanguages,

      autoPlayNextVideoPlaylist: this.localStorageService.getItem(UserLocalStorageKeys.AUTO_PLAY_VIDEO_PLAYLIST) !== 'false',
      autoPlayVideo: this.localStorageService.getItem(UserLocalStorageKeys.AUTO_PLAY_VIDEO) === 'true',

      // session storage keys
      autoPlayNextVideo: this.sessionStorageService.getItem(UserLocalStorageKeys.SESSION_STORAGE_AUTO_PLAY_NEXT_VIDEO) === 'true'
    })
  }

  getUsers (parameters: {
    pagination: RestPagination
    sort: SortMeta
    search?: string
  }): Observable<ResultList<UserServerModel>> {
    const { pagination, sort, search } = parameters

    let params = new HttpParams()
    params = this.restService.addRestGetParams(params, pagination, sort)

    if (search) {
      const filters = this.restService.parseQueryStringFilter(search, {
        blocked: {
          prefix: 'banned:',
          isBoolean: true
        }
      })

      params = this.restService.addObjectParams(params, filters)
    }

    return this.authHttp.get<ResultList<UserServerModel>>(UserService.BASE_USERS_URL, { params })
               .pipe(
                 map(res => this.restExtractor.convertResultListDateToHuman(res)),
                 map(res => this.restExtractor.applyToResultListData(res, this.formatUser.bind(this))),
                 catchError(err => this.restExtractor.handleError(err))
               )
  }

  removeUser (usersArg: UserServerModel | UserServerModel[]) {
    const users = Array.isArray(usersArg) ? usersArg : [ usersArg ]

    return from(users)
      .pipe(
        concatMap(u => this.authHttp.delete(UserService.BASE_USERS_URL + u.id)),
        toArray(),
        catchError(err => this.restExtractor.handleError(err))
      )
  }

  banUsers (usersArg: UserServerModel | UserServerModel[], reason?: string) {
    const body = reason ? { reason } : {}
    const users = Array.isArray(usersArg) ? usersArg : [ usersArg ]

    return from(users)
      .pipe(
        concatMap(u => this.authHttp.post(UserService.BASE_USERS_URL + u.id + '/block', body)),
        toArray(),
        catchError(err => this.restExtractor.handleError(err))
      )
  }

  unbanUsers (usersArg: UserServerModel | UserServerModel[]) {
    const users = Array.isArray(usersArg) ? usersArg : [ usersArg ]

    return from(users)
      .pipe(
        concatMap(u => this.authHttp.post(UserService.BASE_USERS_URL + u.id + '/unblock', {})),
        toArray(),
        catchError(err => this.restExtractor.handleError(err))
      )
  }

  getAnonymousOrLoggedUser () {
    if (!this.authService.isLoggedIn()) {
      return of(this.getAnonymousUser())
    }

    return this.authService.userInformationLoaded
        .pipe(
          first(),
          map(() => this.authService.getUser())
        )
  }

  private formatUser (user: UserServerModel) {
    let videoQuota
    if (user.videoQuota === -1) {
      videoQuota = '∞'
    } else {
      videoQuota = getBytes(user.videoQuota, 0)
    }

    const videoQuotaUsed = getBytes(user.videoQuotaUsed, 0)

    let videoQuotaDaily: string
    let videoQuotaUsedDaily: string
    if (user.videoQuotaDaily === -1) {
      videoQuotaDaily = '∞'
      videoQuotaUsedDaily = getBytes(0, 0) + ''
    } else {
      videoQuotaDaily = getBytes(user.videoQuotaDaily, 0) + ''
      videoQuotaUsedDaily = getBytes(user.videoQuotaUsedDaily || 0, 0) + ''
    }

    const roleLabels: { [ id in UserRole ]: string } = {
      [UserRole.USER]: $localize`User`,
      [UserRole.ADMINISTRATOR]: $localize`Administrator`,
      [UserRole.MODERATOR]: $localize`Moderator`
    }

    return Object.assign(user, {
      roleLabel: roleLabels[user.role],
      videoQuota,
      videoQuotaUsed,
      rawVideoQuota: user.videoQuota,
      rawVideoQuotaUsed: user.videoQuotaUsed,
      videoQuotaDaily,
      videoQuotaUsedDaily,
      rawVideoQuotaDaily: user.videoQuotaDaily,
      rawVideoQuotaUsedDaily: user.videoQuotaUsedDaily
    })
  }
}