const YOUTUBE_API = "https://youtube.googleapis.com/youtube/v3"
const API_KEY = "YOUR_KEY_HERE"
const channelIdArray = [
  "UCT6iAerLNE-0J1S_E97UAuQ", // YongYea
  "UC9PBzalIcEQCsiIkq36PyUA", // Digital Foundry
  "UCoTIpyf8_RGzJ1LPTmvadaA", // CENTRAL
  "UCNvzD7Z-g64bPXxGzaQaa4g", // gameranx
  "UCcGL_0yoZTskvlgAixaEjEg", // whatoplay
  "UCawsJGDMV6IOm6z9yiOyIsQ", // Cronosfera
  "UC-zfTtp6tir7yJIrpsgS0dA", // Intoxi Anime
  "UCBJycsmduvYEL83R_U4JriQ", // Marques Brownlee
  "UCsBjURrPoezykLs9EqgamOA", // Fireship
  "UCWFKCr40YwOZQx8FHU_ZqqQ", // JerryRigEverything
  "UCr6JcgG9eskEzL-k6TtL9EQ", // ZONEofTECH
  "UCsgv2QHkT2ljEixyulzOnUQ", // AngryJoeShow
  "UCZ7AeeVbyslLM_8-nVy2B8Q", // Skill Up
  "UCsvn_Po0SmunchJYOWpOxMg", // videogamedunkey
  "UCVYamHliCI9rw1tHR1xbkfw", // Dave2D
]
// 120 minutes interval
const refreshInterval = (120*60*1000)

try {
  const videos = await getRecentYoutubeVideos(channelIdArray, getMaxQuantityAllowed())
  const widget = videos.length > 0
  ? await createVideoWidget(videos)
  : getWidgetWithMessage({
    message: "Nothing new here",
    secondaryMessage: "No video published in the last 24 hours",
    image: SFSymbol.named("video.bubble.left").image
  })
  widget.refreshAfterDate = new Date(Date.now() + (90*60*1000))
  renderWidget(widget)
} catch(error) {
  const widget = await createErrorWidget(error)
  renderWidget(widget)
}

async function createVideoWidget(videos) {
  const widget = new ListWidget()
  setBackground(widget)
  setTitleStack(widget)
  widget.addSpacer(5)
  await createVideoGrid(widget, videos)
  widget.addSpacer()
  widget.url = "https://www.youtube.com/feed/subscriptions"
  return widget
}

async function createVideoGrid(widget, videos) {
  const gridStack = widget.addStack()
  gridStack.layoutVertically()
  for (const video of videos) {
    await addVideoToGridStack(gridStack, video)
  }
}

async function addVideoToGridStack(gridStack, video) {
  const {snippet, id} = video
  const {title, thumbnails, publishedAt, channelTitle} = snippet
  const videoStack = gridStack.addStack()
  videoStack.layoutHorizontally()
  videoStack.addSpacer()
  videoStack.url = `https://www.youtube.com/watch?v=${id.videoId}`

  const coverElement = videoStack.addImage(await loadImageFromUrl(thumbnails.medium.url))
  coverElement.imageSize = new Size(90, 60)
  coverElement.cornerRadius = 10
  videoStack.addSpacer(10)

  const contentStack = videoStack.addStack()
  contentStack.layoutVertically()
  contentStack.size = new Size(210, 0)
  contentStack.addSpacer(3)

  const titleStack = contentStack.addStack()
  titleStack.size = new Size(0, 32)
  const titleElement = titleStack.addText(title)
  titleElement.lineLimit = 2
  titleElement.font = Font.boldSystemFont(13)

  contentStack.addSpacer(7)

  const additionalInfoStack = contentStack.addStack()
  const channelNameElement = additionalInfoStack.addText(channelTitle)
  channelNameElement.font = Font.semiboldSystemFont(11)
  channelNameElement.lineLimit = 1
  additionalInfoStack.addSpacer()
  const hourDifference = getHourDifference(new Date(publishedAt))
  const publishedTimeElement = additionalInfoStack.addText(
    hourDifference > 1
      ? `${getHourDifference(new Date(publishedAt))} hours ago`
      : `Just now`
    )
  publishedTimeElement.font = Font.semiboldSystemFont(11)

  videoStack.addSpacer()
}

async function getRecentYoutubeVideos(channelIdArray, limit) {
  let videoArray = []
  const today = new Date()
  const yesterday = new Date()
  yesterday.setDate(yesterday.getDate() - 1)

  for(const channelId of channelIdArray) {
    if (videoArray.length < limit) {
      const request = new Request(`${YOUTUBE_API}/search?part=snippet&key=${API_KEY}&channelId=${channelId}&publishedAfter=${formatDateToRFC(yesterday)}&publishedBefore=${formatDateToRFC(today)}`)
      const response = await request.loadJSON()
      if (response.error) {
        throw new Error(response.error.message)
      }
      if (response.items) {
        videoArray = [...videoArray, ...response.items]
      }
    }
  }
  
  videoArray.sort((v1, v2) => new Date(v2.snippet.publishedAt) - new Date(v1.snippet.publishedAt))
  return videoArray.length > limit
    ? videoArray.slice(0, limit)
    : videoArray
}

async function setTitleStack(widget) {
  const titleStack = widget.addStack()
  titleStack.size = new Size(330, 15)
  const dateFormatter = new DateFormatter()
  dateFormatter.dateFormat = "HH:mm"
  const lastUpdate = titleStack.addText(`Last update: ${dateFormatter.string(new Date())}`)
  lastUpdate.font = Font.boldSystemFont(13)
}

function createErrorWidget(error) {
  return getWidgetWithMessage({
    message: "Cannot load videos",
    secondaryMessage: error.toString().replace("Error: ", ""),
    image: SFSymbol.named("wifi.exclamationmark").image,
  })
}

function getWidgetWithMessage({message, secondaryMessage, image}) {
  const widget = new ListWidget()
  setBackground(widget, {})
  widget.addSpacer()
  const contentStack = widget.addStack()
  contentStack.layoutHorizontally()
  contentStack.addSpacer()
  const imageElement = contentStack.addImage(image)
  imageElement.tintColor = Color.white()
  imageElement.imageSize = new Size(27, 27)
  contentStack.addSpacer()
  const textElement = contentStack.addText(message)
  textElement.font = Font.systemFont(23)
  contentStack.addSpacer()
  widget.addSpacer(10)
  const errorDetailStack = widget.addStack()
  errorDetailStack.layoutHorizontally()
  errorDetailStack.addSpacer()
  const errorDetailElement = errorDetailStack.addText(secondaryMessage)
  errorDetailElement.font = Font.systemFont(13)
  errorDetailStack.addSpacer()
  widget.addSpacer()
  return widget
}

async function setBackground(widget) {
  widget.backgroundColor = new Color("ad0303")
}

function renderWidget(widget) {
  if (config.runsInWidget) {
    Script.setWidget(widget)
  } else {
    widget.presentMedium()
  }

  Script.complete()
}

function getMaxQuantityAllowed() {
  switch(config.widgetFamily) {
    case 'small':
      return 1
    case 'medium':
      return 2
    case 'large':
      return 5
    default:
      return 2
  }
}

async function loadImageFromUrl(url) {
  const req = new Request(url)
  return req.loadImage()
}

function formatDateToRFC(date) {
  const dateFormatter = new DateFormatter()
  dateFormatter.dateFormat = "yyyy-MM-dd"
  const timeFormatter = new DateFormatter()
  timeFormatter.dateFormat = "HH:mm:ss"

  return `${dateFormatter.string(date)}T${timeFormatter.string(date)}Z`
}

function getHourDifference(date) {
  return Math.floor(Math.abs(new Date() - date) / 3.6e6)
}