// ==UserScript==
// @name               Auto Skip YouTube Ads
// @name:vi            Tự Động Bỏ Qua Quảng Cáo YouTube
// @name:zh-CN         自动跳过 YouTube 广告
// @name:zh-TW         自動跳過 YouTube 廣告
// @name:ja            YouTube 広告を自動スキップ
// @name:ko            YouTube 광고 자동 건너뛰기
// @name:es            Saltar Automáticamente Anuncios De YouTube
// @name:pt-BR         Pular Automaticamente Anúncios Do YouTube
// @name:ru            Автоматический Пропуск Рекламы На YouTube
// @name:id            Lewati Otomatis Iklan YouTube
// @name:hi            YouTube विज्ञापन स्वचालित रूप से छोड़ें
// @namespace          https://github.com/tientq64/userscripts
// @version            4.8.3
// @description        Automatically skip YouTube ads almost instantly. Remove the ad blocker warning pop-up.
// @description:vi     Tự động bỏ qua quảng cáo YouTube gần như ngay lập tức. Loại bỏ cửa sổ bật lên cảnh báo trình chặn quảng cáo.
// @description:zh-CN  几乎立即自动跳过 YouTube 广告。删除广告拦截器警告弹出窗口。
// @description:zh-TW  幾乎立即自動跳過 YouTube 廣告。刪除廣告攔截器警告彈出視窗。
// @description:ja     YouTube 広告をほぼ瞬時に自動的にスキップします。広告ブロッカーの警告ポップアップを削除します。
// @description:ko     YouTube 광고를 거의 즉시 자동으로 건너뜁니다. 광고 차단 경고 팝업을 제거합니다.
// @description:es     Omite automáticamente los anuncios de YouTube casi al instante. Elimina la ventana emergente de advertencia del bloqueador de anuncios.
// @description:pt-BR  Pule automaticamente os anúncios do YouTube quase instantaneamente. Remova o pop-up de aviso do bloqueador de anúncios.
// @description:ru     Автоматически пропускайте рекламу YouTube почти мгновенно. Уберите всплывающее предупреждение о блокировщике рекламы.
// @description:id     Lewati iklan YouTube secara otomatis hampir seketika. Hapus pop-up peringatan pemblokir iklan.
// @description:hi     YouTube विज्ञापनों को लगभग तुरंत ही स्वचालित रूप से छोड़ दें। विज्ञापन अवरोधक चेतावनी पॉप-अप हटाएँ।
// @author             tientq64
// @icon               https://cdn-icons-png.flaticon.com/64/2504/2504965.png
// @match              https://www.youtube.com/*
// @match              https://music.youtube.com/*
// @grant              GM_getValue
// @grant              GM_setValue
// @grant              GM_registerMenuCommand
// @license            MIT
// @compatible         firefox
// @compatible         chrome
// @compatible         opera
// @compatible         safari
// @compatible         edge
// @noframes
// @homepage           https://github.com/tientq64/userscripts/tree/main/scripts/Auto-Skip-YouTube-Ads
// @downloadURL none
// ==/UserScript==

/**
 * Skip ads. Remove ad blocker warning.
 */
function skipAd() {
    video = null
    fineScrubber = document.querySelector('.ytp-fine-scrubbing')

    // Check if the current URL is a YouTube Shorts URL and exit the function if true.
    if (window.location.pathname.startsWith('/shorts/')) return

    const player = document.querySelector('#movie_player')

    if (player) {
        hasAd = player.classList.contains('ad-showing')
        video = player.querySelector('video.html5-main-video')
    }

    if (hasAd) {
        const skipButton = document.querySelector(`
            .ytp-skip-ad-button,
            .ytp-ad-skip-button,
            .ytp-ad-skip-button-modern,
            .ytp-ad-survey-answer-button
        `)
        // Click the skip ad button if available.
        if (skipButton) {
            skipButton.click()
            skipButton.remove()
        }
        // Otherwise, fast forward to the end of the ad video.
        // Use `9999` instead of `video.duration` to avoid errors when `duration` is not a number.
        else if (video && video.src) {
            video.currentTime = 9999
        }
    }

    if (video) {
        video.addEventListener('pause', handleVideoPause)
        video.addEventListener('mouseup', allowPauseVideo)
        video.addEventListener('timeupdate', handleVideoTimeUpdate)
    }

    // Remove ad blocker warning dialog if it appears.
    const adBlockerWarningDialog = document.querySelector(
        'tp-yt-paper-dialog:has(#feedback.ytd-enforcement-message-view-model)'
    )
    if (adBlockerWarningDialog) {
        adBlockerWarningDialog.remove()
    }

    // Handle when ad blocker warning appears inside video player.
    // Currently there is NO WAY TO REMOVE it. Temporary workaround is to reload the page.
    const adBlockerWarningInner = document.querySelector(
        '.yt-playability-error-supported-renderers:has(.ytd-enforcement-message-view-model)'
    )
    if (adBlockerWarningInner) {
        if (checkCanReloadPage()) {
            adBlockerWarningInner.remove()
            const params = new URLSearchParams(location.search)
            if (currentVideoTime > 0) {
                params.set('t', Math.floor(currentVideoTime) + 's')
            }
            const newUrl = location.origin + location.pathname + '?' + params.toString()
            location.replace(newUrl)
        }
    }

    // Video pause button.
    const playButton = document.querySelector('button.ytp-play-button')
    if (playButton) {
        playButton.addEventListener('click', allowPauseVideo)
    }

    // Remove short video ads.
    // Note: Do this because can't just use CSS to hide it, as it will cause problems when scrolling to the next video.
    const adShortVideos = document.querySelectorAll(
        'ytd-reel-video-renderer:has(.ytd-ad-slot-renderer)'
    )
    for (const adShortVideo of adShortVideos) {
        adShortVideo.remove()
    }
}

/**
 * Check if the user is focused on the input.
 */
function checkEnteringInput() {
    if (document.activeElement === null) {
        return false
    }
    return document.activeElement.matches('input, textarea, select')
}

/**
 * Check if the page can be reloaded.
 */
function checkCanReloadPage() {
    if (!config.allowedReloadPage) {
        return false
    }
    if (!config.dontReloadWhileBusy) {
        return true
    }
    if (checkEnteringInput()) {
        return false
    }
    // Do not reload while the user is reading comments.
    if (document.documentElement.scrollTop > 200) {
        return false
    }
    return true
}

/**
 * Temporarily allows the video to be paused, for a short period of time.
 */
function allowPauseVideo() {
    pausedByUser = true
    window.clearTimeout(allowPauseVideoTimeoutId)
    allowPauseVideoTimeoutId = window.setTimeout(disallowPauseVideo, 500)
}

/**
 * Pausing the video is not allowed. The purpose is to prevent video from being paused, against the
 * behavior of pausing video when YouTube ad blocking warning dialog appears. Unless certain
 * conditions, such as pausing by user, etc.
 */
function disallowPauseVideo() {
    pausedByUser = false
    window.clearTimeout(allowPauseVideoTimeoutId)
}

function handleWindowBlur() {
    isTabBlurred = true
}

function handleWindowFocus() {
    isTabBlurred = false
}

/**
 * Handle when video is paused. If certain conditions are not met, it will continue playing.
 * Returning early in this function means the video should be paused as it should be.
 */
function handleVideoPause() {
    if (isYouTubeMusic) return

    // If it was stopped by the user, it's ok, let the video pause as it should, and exit the function.
    if (pausedByUser) {
        disallowPauseVideo()
        return
    }

    // The video will pause normally if the tab is not focused. This is to allow for pausing the video via the media controller (of the browser or operating system), etc.
    // Note: Although this also puts YouTube at risk of pausing the video to annoy you, but it is an acceptable temporary solution.
    if (document.hidden) return
    if (isTabBlurred) return

    if (fineScrubber && fineScrubber.style.display !== 'none') return
    if (video === null) return
    if (video.duration - video.currentTime < 0.1) return
    video.play()
}

function handleVideoTimeUpdate() {
    if (hasAd || video === null) return
    currentVideoTime = video.currentTime
}

/**
 * Handle both keyboard press or release events.
 */
function handleWindowKeyDownAndKeyUp(event) {
    if (isYouTubeMusic) return
    if (checkEnteringInput()) return
    const code = event.code
    if (event.type === 'keydown') {
        if (code === 'KeyK' || code === 'MediaPlayPause') {
            allowPauseVideo()
        }
    } else {
        if (code === 'Space') {
            allowPauseVideo()
        }
    }
}

/**
 * Save current configuration.
 */
function saveConfig() {
    GM_setValue('config', config)
}

/**
 * Register menu commands, or update the menu.
 */
function registerMenuCommands() {
    {
        const status = config.allowedReloadPage ? 'Yes' : 'No'
        GM_registerMenuCommand(
            `Reload page if ad cannot be skipped: ${status}`,
            () => {
                config.allowedReloadPage = !config.allowedReloadPage
                saveConfig()
                updateMenuCommands()
            },
            {
                id: 0,
                autoClose: false
            }
        )
    }
    {
        const status = config.dontReloadWhileBusy ? 'Yes' : 'No'
        GM_registerMenuCommand(
            `Don't reload while the user is busy: ${status}`,
            () => {
                config.dontReloadWhileBusy = !config.dontReloadWhileBusy
                saveConfig()
                updateMenuCommands()
            },
            {
                id: 1,
                autoClose: false
            }
        )
    }
}

/**
 * Update menu commands.
 *
 * @alias registerMenuCommands
 */
function updateMenuCommands() {
    registerMenuCommands()
}

/**
 * Add CSS hides some ad elements on the page.
 */
function addCSSHideAds() {
    const selectors = [
        // Ad banner in the upper right corner, above the video playlist.
        '#player-ads',
        '#panels:has(ytd-engagement-panel-section-list-renderer[target-id="engagement-panel-ads"])',

        '#masthead-ad',

        // Temporarily comment out this selector to fix issue
        // [#265124](https://greasyfork.org/en/scripts/498197-auto-skip-youtube-ads/discussions/265124).
        // '#panels:has(ytd-ads-engagement-panel-content-renderer)',

        'ytd-ad-slot-renderer',

        // Sponsored ad video items on home page.
        'ytd-rich-item-renderer:has(.ytd-ad-slot-renderer)',

        'ytd-rich-section-renderer:has(.ytd-statement-banner-renderer)',

        // Ad videos on YouTube Short.
        'ytd-reel-video-renderer:has(.ytd-ad-slot-renderer)',

        // Ad blocker warning dialog.
        'tp-yt-paper-dialog:has(#feedback.ytd-enforcement-message-view-model)',

        // Survey dialog on home page, located at bottom right.
        'tp-yt-paper-dialog:has(> ytd-checkbox-survey-renderer)',

        '.ytp-suggested-action',
        '.yt-mealbar-promo-renderer',

        // YouTube Music Premium trial promotion dialog, bottom left corner.
        'ytmusic-mealbar-promo-renderer',

        // YouTube Music Premium trial promotion banner on home page.
        'ytmusic-statement-banner-renderer'
    ]
    const css = `${selectors.join(',')}{display:none!important}`
    const style = document.createElement('style')
    style.textContent = css
    document.head.appendChild(style)
}

/**
 * Default configuration.
 */
const defaultConfig = {
    allowedReloadPage: true,
    dontReloadWhileBusy: true
}

// Load configuration.
const config = GM_getValue('config', defaultConfig)
for (const key in defaultConfig) {
    if (config[key] == null) {
        config[key] = defaultConfig[key]
    }
}

/**
 * Is the current page YouTube Music.
 */
const isYouTubeMusic = location.hostname === 'music.youtube.com'

/**
 * Current video element.
 */
let video = null

let fineScrubber = null
let hasAd = false
let currentVideoTime = 0

/**
 * Is the video paused by the user, not paused by YouTube's ad blocker warning dialog.
 */
let pausedByUser = false

/**
 * Is the current tab blurred.
 */
let isTabBlurred = false

let allowPauseVideoTimeoutId = 0

// Observe DOM changes to detect ads.
if (window.MutationObserver) {
    const observer = new MutationObserver(skipAd)
    observer.observe(document.body, {
        attributes: true,
        attributeFilter: ['class', 'src'],
        childList: true,
        subtree: true
    })
}
// If DOM observation is not supported. Detect ads every 500ms (2 times per second).
else {
    window.setInterval(skipAd, 500)
}

window.addEventListener('blur', handleWindowBlur)
window.addEventListener('focus', handleWindowFocus)
window.addEventListener('keydown', handleWindowKeyDownAndKeyUp)
window.addEventListener('keyup', handleWindowKeyDownAndKeyUp)

addCSSHideAds()
registerMenuCommands()
skipAd()