import { first, map } from 'rxjs/operators'
import { SelectChannelItem } from 'src/types/select-options-item.model'
import { DatePipe } from '@angular/common'
import { HttpErrorResponse } from '@angular/common/http'
import { Notifier } from '@app/core'
import { HttpStatusCode } from '@shared/core-utils/miscs/http-error-codes'
import { environment } from '../../environments/environment'
import { AuthService } from '../core/auth'

// Thanks: https://stackoverflow.com/questions/901115/how-can-i-get-query-string-values-in-javascript
function getParameterByName (name: string, url: string) {
  if (!url) url = window.location.href
  name = name.replace(/[\[\]]/g, '\\$&')

  const regex = new RegExp('[?&]' + name + '(=([^&#]*)|&|#|$)')
  const results = regex.exec(url)

  if (!results) return null
  if (!results[2]) return ''

  return decodeURIComponent(results[2].replace(/\+/g, ' '))
}

function listUserChannels (authService: AuthService) {
  return authService.userInformationLoaded
    .pipe(
      first(),
      map(() => {
        const user = authService.getUser()
        if (!user) return undefined

        const videoChannels = user.videoChannels
        if (Array.isArray(videoChannels) === false) return undefined

        return videoChannels
          .sort((a, b) => {
            if (a.updatedAt < b.updatedAt) return 1
            if (a.updatedAt > b.updatedAt) return -1
            return 0
          })
          .map(c => ({
            id: c.id,
            label: c.displayName,
            support: c.support,
            avatarPath: c.avatar?.path
          }) as SelectChannelItem)
      })
    )
}

function getAbsoluteAPIUrl () {
  let absoluteAPIUrl = environment.hmr === true
    ? 'http://localhost:9000'
    : environment.apiUrl

  if (!absoluteAPIUrl) {
    // The API is on the same domain
    absoluteAPIUrl = window.location.origin
  }

  return absoluteAPIUrl
}

function getAbsoluteEmbedUrl () {
  let absoluteEmbedUrl = environment.originServerUrl
  if (!absoluteEmbedUrl) {
    // The Embed is on the same domain
    absoluteEmbedUrl = window.location.origin
  }

  return absoluteEmbedUrl
}

const datePipe = new DatePipe('en')
function dateToHuman (date: string) {
  return datePipe.transform(date, 'medium')
}

function durationToString (duration: number) {
  const hours = Math.floor(duration / 3600)
  const minutes = Math.floor((duration % 3600) / 60)
  const seconds = duration % 60

  const minutesPadding = minutes >= 10 ? '' : '0'
  const secondsPadding = seconds >= 10 ? '' : '0'
  const displayedHours = hours > 0 ? hours.toString() + ':' : ''

  return (
    displayedHours + minutesPadding + minutes.toString() + ':' + secondsPadding + seconds.toString()
  ).replace(/^0/, '')
}

function immutableAssign <A, B> (target: A, source: B) {
  return Object.assign({}, target, source)
}

// Thanks: https://gist.github.com/ghinda/8442a57f22099bdb2e34
function objectToFormData (obj: any, form?: FormData, namespace?: string) {
  const fd = form || new FormData()
  let formKey

  for (const key of Object.keys(obj)) {
    if (namespace) formKey = `${namespace}[${key}]`
    else formKey = key

    if (obj[key] === undefined) continue

    if (Array.isArray(obj[key]) && obj[key].length === 0) {
      fd.append(key, null)
      continue
    }

    if (obj[key] !== null && typeof obj[ key ] === 'object' && !(obj[ key ] instanceof File)) {
      objectToFormData(obj[ key ], fd, formKey)
    } else {
      fd.append(formKey, obj[ key ])
    }
  }

  return fd
}

function objectLineFeedToHtml (obj: any, keyToNormalize: string) {
  return immutableAssign(obj, {
    [keyToNormalize]: lineFeedToHtml(obj[keyToNormalize])
  })
}

function lineFeedToHtml (text: string) {
  if (!text) return text

  return text.replace(/\r?\n|\r/g, '<br />')
}

function removeElementFromArray <T> (arr: T[], elem: T) {
  const index = arr.indexOf(elem)
  if (index !== -1) arr.splice(index, 1)
}

function sortBy (obj: any[], key1: string, key2?: string) {
  return obj.sort((a, b) => {
    const elem1 = key2 ? a[key1][key2] : a[key1]
    const elem2 = key2 ? b[key1][key2] : b[key1]

    if (elem1 < elem2) return -1
    if (elem1 === elem2) return 0
    return 1
  })
}

function scrollToTop (behavior: 'auto' | 'smooth' = 'auto') {
  window.scrollTo({
    left: 0,
    top: 0,
    behavior
  })
}

function isInViewport (el: HTMLElement) {
  const bounding = el.getBoundingClientRect()
  return (
      bounding.top >= 0 &&
      bounding.left >= 0 &&
      bounding.bottom <= (window.innerHeight || document.documentElement.clientHeight) &&
      bounding.right <= (window.innerWidth || document.documentElement.clientWidth)
  )
}

function isXPercentInViewport (el: HTMLElement, percentVisible: number) {
  const rect = el.getBoundingClientRect()
  const windowHeight = (window.innerHeight || document.documentElement.clientHeight)

  return !(
    Math.floor(100 - (((rect.top >= 0 ? 0 : rect.top) / +-(rect.height / 1)) * 100)) < percentVisible ||
    Math.floor(100 - ((rect.bottom - windowHeight) / rect.height) * 100) < percentVisible
  )
}

function genericUploadErrorHandler (parameters: {
  err: Pick<HttpErrorResponse, 'message' | 'status' | 'headers'>
  name: string
  notifier: Notifier
  sticky?: boolean
}) {
  const { err, name, notifier, sticky } = { sticky: false, ...parameters }
  const title = $localize`The upload failed`
  let message = err.message

  if (err instanceof ErrorEvent) { // network error
    message = $localize`The connection was interrupted`
    notifier.error(message, title, null, sticky)
  } else if (err.status === HttpStatusCode.INTERNAL_SERVER_ERROR_500) {
    message = $localize`The server encountered an error`
    notifier.error(message, title, null, sticky)
  } else if (err.status === HttpStatusCode.REQUEST_TIMEOUT_408) {
    message = $localize`Your ${name} file couldn't be transferred before the set timeout (usually 10min)`
    notifier.error(message, title, null, sticky)
  } else if (err.status === HttpStatusCode.PAYLOAD_TOO_LARGE_413) {
    const maxFileSize = err.headers?.get('X-File-Maximum-Size') || '8G'
    message = $localize`Your ${name} file was too large (max. size: ${maxFileSize})`
    notifier.error(message, title, null, sticky)
  } else {
    notifier.error(err.message, title)
  }

  return message
}

export {
  sortBy,
  durationToString,
  lineFeedToHtml,
  getParameterByName,
  getAbsoluteAPIUrl,
  dateToHuman,
  immutableAssign,
  objectToFormData,
  getAbsoluteEmbedUrl,
  objectLineFeedToHtml,
  removeElementFromArray,
  scrollToTop,
  isInViewport,
  isXPercentInViewport,
  listUserChannels,
  genericUploadErrorHandler
}