/**
 * MUSE Video Ad Scriptlets v2
 * Injected via initialization_script BEFORE any page JavaScript runs.
 * 
 * UNIVERSAL approach — not YouTube-specific. Works by:
 * 1. Patching JSON.parse/Response.json to prune known ad properties
 * 2. Blocking known ad-serving fetch/XHR patterns
 * 3. Blocking VAST/VPAID/IMA SDK script loading
 * 4. Auto-skipping video ads when detected
 * 5. Collapsing blank ad containers
 *
 * TIMING IS CRITICAL: runs before ANY page JavaScript.
 */
(function() {
'use strict';

// ═══════════════════════════════════════════════════════════════════════════════
// UNIVERSAL JSON PRUNE — removes ad-related properties from ALL parsed JSON
// Works on YouTube, Dailymotion, Reddit, news sites, any site using JSON APIs
// ═══════════════════════════════════════════════════════════════════════════════

const AD_JSON_KEYS = new Set([
    'adPlacements', 'playerAds', 'adSlots', 'adBreaks', 'adBreakServiceRenderer',
    'promotedSparklesWebRenderer', 'promotedVideoRenderer', 'adRenderer',
    'displayAdRenderer', 'promoted', 'sponsoredAd', 'sponsoredContent',
    'ad_placements', 'player_ads', 'ad_slots', 'ad_breaks',
    'vastUrl', 'vastXml', 'vpaidUrl',
    'adTagUrl', 'adUnit', 'adSource',
]);

const AD_JSON_NESTED = [
    'auxiliaryUi.messageRenderers.enforcementMessageViewModel',
    'overlay.playerBarActionRenderer',
];

function deepPruneAdKeys(obj, depth) {
    if (!obj || typeof obj !== 'object' || depth > 8) return;
    if (Array.isArray(obj)) {
        obj.forEach(item => deepPruneAdKeys(item, depth + 1));
        return;
    }
    for (const key of Object.keys(obj)) {
        if (AD_JSON_KEYS.has(key)) {
            delete obj[key];
        } else if (typeof obj[key] === 'object') {
            deepPruneAdKeys(obj[key], depth + 1);
        }
    }
}

function pruneNested(obj, path) {
    const parts = path.split('.');
    let target = obj;
    for (let i = 0; i < parts.length - 1; i++) {
        if (!target || typeof target !== 'object') return;
        target = target[parts[i]];
    }
    if (target && typeof target === 'object') {
        delete target[parts[parts.length - 1]];
    }
}

// Patch JSON.parse — universal
const _JSONParse = JSON.parse;
JSON.parse = function() {
    const result = _JSONParse.apply(this, arguments);
    if (result && typeof result === 'object') {
        deepPruneAdKeys(result, 0);
        for (const path of AD_JSON_NESTED) {
            pruneNested(result, path);
        }
    }
    return result;
};

// Patch Response.prototype.json — universal for fetch APIs
const _responseJson = Response.prototype.json;
Response.prototype.json = function() {
    return _responseJson.apply(this, arguments).then(data => {
        if (data && typeof data === 'object') {
            deepPruneAdKeys(data, 0);
            for (const path of AD_JSON_NESTED) {
                pruneNested(data, path);
            }
        }
        return data;
    });
};

// ═══════════════════════════════════════════════════════════════════════════════
// UNIVERSAL FETCH/XHR BLOCK — blocks ad-related network requests on all sites
// ═══════════════════════════════════════════════════════════════════════════════

const AD_URL_PATTERNS = [
    '/pagead/', '/ptracking', '/api/stats/ads', '/ad_break',
    'doubleclick.net', 'googlesyndication.com', 'googleadservices.com',
    'imasdk.googleapis.com', 'securepubads.g.doubleclick.net',
    'amazon-adsystem.com', 'twitchsvc.net',
    '/ads/bid', '/ads/log', '/ads/event',
    'ad.doubleclick.net', 'pagead2.googlesyndication.com',
    'stats.g.doubleclick.net', '2mdn.net',
    '/api/stats/qoe?adformat', 'play.google.com/log',
    'video-ad-stats', '/adunit', '/vast/',
];

function isAdUrl(url) {
    if (!url) return false;
    return AD_URL_PATTERNS.some(p => url.includes(p));
}

const _fetch = window.fetch;
window.fetch = function(input, init) {
    const url = typeof input === 'string' ? input : (input instanceof Request ? input.url : '');
    if (isAdUrl(url)) {
        return Promise.resolve(new Response('{}', { status: 200, headers: { 'Content-Type': 'application/json' } }));
    }
    return _fetch.apply(this, arguments);
};

const _xhrOpen = XMLHttpRequest.prototype.open;
XMLHttpRequest.prototype.open = function(method, url) {
    this.__muse_blocked = isAdUrl(url);
    return _xhrOpen.apply(this, arguments);
};
const _xhrSend = XMLHttpRequest.prototype.send;
XMLHttpRequest.prototype.send = function() {
    if (this.__muse_blocked) {
        Object.defineProperty(this, 'readyState', { get: () => 4, configurable: true });
        Object.defineProperty(this, 'status', { get: () => 200, configurable: true });
        Object.defineProperty(this, 'responseText', { get: () => '{}', configurable: true });
        Object.defineProperty(this, 'response', { get: () => '{}', configurable: true });
        setTimeout(() => { if (typeof this.onload === 'function') this.onload(new Event('load')); }, 0);
        return;
    }
    return _xhrSend.apply(this, arguments);
};

// ═══════════════════════════════════════════════════════════════════════════════
// UNIVERSAL SCRIPT BLOCK — prevent ad SDK loading on all sites
// ═══════════════════════════════════════════════════════════════════════════════

const AD_SCRIPT_PATTERNS = [
    'imasdk.googleapis.com', 'securepubads', 'pagead2.googlesyndication',
    'adsbygoogle', 'googletag', 'gpt.js', 'pubads',
    'amazon-adsystem.com/aax', 'moat', 'doubleclick.net/tag',
];

const _createElement = document.createElement.bind(document);
document.createElement = function(tag) {
    const el = _createElement(tag);
    if (tag.toLowerCase() === 'script') {
        const _setSrc = Object.getOwnPropertyDescriptor(HTMLScriptElement.prototype, 'src')?.set;
        if (_setSrc) {
            Object.defineProperty(el, 'src', {
                set(value) {
                    if (typeof value === 'string' && AD_SCRIPT_PATTERNS.some(p => value.includes(p))) {
                        return; // silently block
                    }
                    _setSrc.call(this, value);
                },
                get() { return el.getAttribute('src') || ''; },
                configurable: true,
            });
        }
    }
    return el;
};

// ═══════════════════════════════════════════════════════════════════════════════
// VIDEO AD SKIP — auto-skip/fast-forward video ads when detected (all sites)
// ═══════════════════════════════════════════════════════════════════════════════

function setupVideoAdSkipper() {
    const skipSelectors = [
        '.ytp-ad-skip-button', '.ytp-ad-skip-button-modern', '.ytp-skip-ad-button',
        '[class*="skip-button"]', '[class*="skipButton"]', '[class*="ad-skip"]',
        'button[class*="skip"]',
    ];

    const adContainerSelectors = [
        '.ytp-ad-module', '.ytp-ad-overlay-container', '.ytp-ad-text-overlay',
        '#player-ads', '#masthead-ad', '.ytd-promoted-sparkles-web-renderer',
        '.ytd-display-ad-renderer', '.ytd-promoted-video-renderer',
        '.ytd-ad-slot-renderer', '.ytd-in-feed-ad-layout-renderer',
        '[class*="ad-container"]', '[class*="ad-banner"]', '[class*="ad-slot"]',
        '.video-ads', '.ad-container', '#ad-display',
    ];

    const observer = new MutationObserver(() => {
        // Auto-click skip buttons
        for (const sel of skipSelectors) {
            const btn = document.querySelector(sel);
            if (btn && btn.offsetParent !== null) {
                btn.click();
            }
        }

        // Collapse ad containers (remove blank spaces)
        for (const sel of adContainerSelectors) {
            document.querySelectorAll(sel).forEach(el => {
                if (el.offsetHeight > 0) {
                    el.style.display = 'none';
                    el.style.height = '0';
                    el.style.overflow = 'hidden';
                    el.style.margin = '0';
                    el.style.padding = '0';
                }
            });
        }

        // Fast-forward video ads (player showing ad state)
        const player = document.querySelector('.html5-video-player');
        if (player && player.classList.contains('ad-showing')) {
            player.classList.remove('ad-showing');
            const video = player.querySelector('video');
            if (video && video.duration && isFinite(video.duration) && video.duration < 120) {
                video.currentTime = video.duration;
                video.playbackRate = 16;
            }
        }
    });

    function startObserving() {
        if (document.body) {
            observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['class'] });
        } else {
            document.addEventListener('DOMContentLoaded', () => {
                observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['class'] });
            });
        }
    }

    startObserving();

    // Also run periodically to catch delayed ads
    setInterval(() => {
        for (const sel of adContainerSelectors) {
            document.querySelectorAll(sel).forEach(el => {
                el.style.display = 'none';
            });
        }
        // Skip any active video ad
        const player = document.querySelector('.html5-video-player.ad-showing');
        if (player) {
            const video = player.querySelector('video');
            if (video && video.duration && isFinite(video.duration)) {
                video.currentTime = video.duration;
            }
        }
    }, 1000);
}

setupVideoAdSkipper();

// ═══════════════════════════════════════════════════════════════════════════════
// TWITCH HLS MANIFEST PRUNING — remove ad segments from stream
// ═══════════════════════════════════════════════════════════════════════════════

if (location.hostname.includes('twitch.tv')) {
    const origFetch = window.fetch;
    window.fetch = function(input, init) {
        const url = typeof input === 'string' ? input : (input instanceof Request ? input.url : '');
        
        if (url.includes('.m3u8')) {
            return origFetch.apply(this, arguments).then(response => {
                const clone = response.clone();
                return clone.text().then(text => {
                    if (text.includes('stitched-ad') || text.includes('advertisement')) {
                        const cleaned = text.split('\n').filter(line => {
                            if (line.includes('#EXT-X-DATERANGE') && (line.includes('stitched-ad') || line.includes('advertisement'))) return false;
                            if (line.includes('#EXT-X-SCTE35-OUT')) return false;
                            return true;
                        }).join('\n');
                        return new Response(cleaned, { status: response.status, statusText: response.statusText, headers: response.headers });
                    }
                    return response;
                });
            });
        }
        return origFetch.apply(this, arguments);
    };
}

// ═══════════════════════════════════════════════════════════════════════════════
// COSMETIC: Inject CSS to collapse ad containers immediately
// ═══════════════════════════════════════════════════════════════════════════════

const adCss = `
.ytp-ad-module, .ytp-ad-overlay-container, .ytp-ad-text-overlay,
#player-ads, #masthead-ad, .ytd-promoted-sparkles-web-renderer,
.ytd-display-ad-renderer, .ytd-promoted-video-renderer,
.ytd-ad-slot-renderer, .ytd-in-feed-ad-layout-renderer,
.ytd-banner-promo-renderer, ytd-rich-item-renderer:has(.ytd-ad-slot-renderer),
[class*="ad-container"], [class*="ad-banner"],
.video-ads, .ad-container, #ad-display,
.ad-showing .ytp-ad-player-overlay,
.ytp-ad-action-interstitial {
    display: none !important;
    height: 0 !important;
    max-height: 0 !important;
    overflow: hidden !important;
    margin: 0 !important;
    padding: 0 !important;
    opacity: 0 !important;
    pointer-events: none !important;
}
`;

const style = document.createElement('style');
style.id = '__muse_ad_collapse';
style.textContent = adCss;
(document.head || document.documentElement).appendChild(style);

})();