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Youtube Live Clock

show present time of the livestream

2022-11-03 يوللانغان نەشرى. ئەڭ يېڭى نەشرىنى كۆرۈش.

// ==UserScript==
// @name               Youtube Live Clock
// @name:zh-TW         Youtube Live Clock
// @namespace          https://greatest.deepsurf.us/scripts/453367
// @version            1.4.1
// @description        show present time of the livestream
// @description:zh-TW  顯示直播當下的時間
// @author             Derek
// @match              *://www.youtube.com/*
// @grant              none
// ==/UserScript==

let $ = (element) => document.querySelector(element)
let $$ = (element) => document.querySelectorAll(element)
let twoDigit = (num) => {
  if (String(num).length === 2) return num
  else return '0' + String(num)
}
let formatTime = (time) => {
  let second = time % 60
  let minute = (time - second) % 3600 / 60
  let hour = (time - minute * 60 - second) / 3600

  if (time < 3600) return `${minute}:${twoDigit(second)}  `
  else return `${hour}:${twoDigit(minute)}:${twoDigit(second)}  `
}
let getClock = () => {
  let liveClock = $('.present-time')
  if (!liveClock) {
      let timeDisplay = $$('.ytp-time-display')
      let clockElement = document.createElement('span')
      clockElement.setAttribute('class', 'present-time')
      timeDisplay[timeDisplay.length - 1].childNodes[1].appendChild(clockElement)
      liveClock = $('.present-time')
  }
  return liveClock
}
let updateTime = () => {
  let isLive = JSON.parse($('.ytd-player-microformat-renderer').textContent).publication
  if (isLive && !$('.html5-ypc-overlay')) {
      let progressBar = $$('.ytp-progress-bar')
      let progressTime = progressBar[progressBar.length - 1].getAttribute('aria-valuenow')
      if (isLive[0].endDate) {
          let presentTime = new Date(Date.parse(isLive[0].startDate) + progressTime * 1000)
          let date = (presentTime).toString().split(' ')
          return ` (${date[3]}/${twoDigit(presentTime.getMonth() + 1)}/${date[2]} ${date[4]})  `
      } else return formatTime(progressTime)
  } else return ''
}

let main = () => {
  if (window.location.href.includes('/watch?v=')) {
    let liveClock = getClock()
    let liveBadge = $('.ytp-live-badge')
    liveBadge.style = 'margin-left: 10px'
    let progressBar = $('.ytp-progress-bar')
    let observer = new MutationObserver(() => { liveClock.textContent = updateTime() })
    observer.observe(progressBar, { attributes: true })
  }
}

document.addEventListener('yt-navigate-finish', main)