import { Component, ElementRef, OnInit } from '@angular/core'
import { FormBuilder, FormGroup } from '@angular/forms'
import { Router } from '@angular/router'

import { FileUploader } from 'ng2-file-upload/ng2-file-upload'
import { NotificationsService } from 'angular2-notifications'

import { AuthService } from '../../core'
import {
  FormReactive,
  VIDEO_NAME,
  VIDEO_CATEGORY,
  VIDEO_LICENCE,
  VIDEO_LANGUAGE,
  VIDEO_DESCRIPTION,
  VIDEO_TAGS
} from '../../shared'
import { VideoService } from '../shared'

@Component({
  selector: 'my-videos-add',
  styleUrls: [ './video-edit.component.scss' ],
  templateUrl: './video-add.component.html'
})

export class VideoAddComponent extends FormReactive implements OnInit {
  tags: string[] = []
  uploader: FileUploader
  videoCategories = []
  videoLicences = []
  videoLanguages = []

  tagValidators = VIDEO_TAGS.VALIDATORS
  tagValidatorsMessages = VIDEO_TAGS.MESSAGES

  error: string = null
  form: FormGroup
  formErrors = {
    name: '',
    category: '',
    licence: '',
    language: '',
    description: ''
  }
  validationMessages = {
    name: VIDEO_NAME.MESSAGES,
    category: VIDEO_CATEGORY.MESSAGES,
    licence: VIDEO_LICENCE.MESSAGES,
    language: VIDEO_LANGUAGE.MESSAGES,
    description: VIDEO_DESCRIPTION.MESSAGES
  }

  // Special error messages
  fileError = ''

  constructor (
    private authService: AuthService,
    private elementRef: ElementRef,
    private formBuilder: FormBuilder,
    private router: Router,
    private notificationsService: NotificationsService,
    private videoService: VideoService
  ) {
    super()
  }

  get filename () {
    if (this.uploader.queue.length === 0) {
      return null
    }

    return this.uploader.queue[0].file.name
  }

  buildForm () {
    this.form = this.formBuilder.group({
      name: [ '', VIDEO_NAME.VALIDATORS ],
      nsfw: [ false ],
      category: [ '', VIDEO_CATEGORY.VALIDATORS ],
      licence: [ '', VIDEO_LICENCE.VALIDATORS ],
      language: [ '', VIDEO_LANGUAGE.VALIDATORS ],
      description: [ '', VIDEO_DESCRIPTION.VALIDATORS ],
      tags: [ '']
    })

    this.form.valueChanges.subscribe(data => this.onValueChanged(data))
  }

  ngOnInit () {
    this.videoCategories = this.videoService.videoCategories
    this.videoLicences = this.videoService.videoLicences
    this.videoLanguages = this.videoService.videoLanguages

    this.uploader = new FileUploader({
      authToken: this.authService.getRequestHeaderValue(),
      queueLimit: 1,
      url: API_URL + '/api/v1/videos',
      removeAfterUpload: true
    })

    this.uploader.onBuildItemForm = (item, form) => {
      const name = this.form.value['name']
      const nsfw = this.form.value['nsfw']
      const category = this.form.value['category']
      const licence = this.form.value['licence']
      const language = this.form.value['language']
      const description = this.form.value['description']
      const tags = this.form.value['tags']

      form.append('name', name)
      form.append('category', category)
      form.append('nsfw', nsfw)
      form.append('licence', licence)

      // Language is optional
      if (language) {
        form.append('language', language)
      }

      form.append('description', description)

      for (let i = 0; i < tags.length; i++) {
        form.append(`tags[${i}]`, tags[i])
      }
    }

    this.buildForm()
  }

  checkForm () {
    this.forceCheck()

    if (this.filename === null) {
      this.fileError = 'You did not add a file.'
    }

    return this.form.valid === true && this.fileError === ''
  }

  fileChanged () {
    this.fileError = ''
  }

  removeFile () {
    this.uploader.clearQueue()
  }

  upload () {
    if (this.checkForm() === false) {
      return
    }

    const item = this.uploader.queue[0]
    // TODO: wait for https://github.com/valor-software/ng2-file-upload/pull/242
    item.alias = 'videofile'

    item.onSuccess = () => {
      console.log('Video uploaded.')
      this.notificationsService.success('Success', 'Video uploaded.')

      // Print all the videos once it's finished
      this.router.navigate(['/videos/list'])
    }

    item.onError = (response: string, status: number) => {
      // We need to handle manually these cases beceause we use the FileUpload component
      if (status === 400) {
        this.error = response
      } else if (status === 401) {
        this.error = 'Access token was expired, refreshing token...'
        this.authService.refreshAccessToken().subscribe(
          () => {
            // Update the uploader request header
            this.uploader.authToken = this.authService.getRequestHeaderValue()
            this.error += ' access token refreshed. Please retry your request.'
          }
        )
      } else {
        this.error = 'Unknow error'
        console.error(this.error)
      }
    }

    this.uploader.uploadAll()
  }
}