// ==UserScript==
// @name         Bilibili 去掉搜索无关视频
// @namespace    http://tampermonkey.net/
// @version      2.0.0
// @description  自动隐藏 Bilibili 搜索结果中不包含关键词的无关视频，支持 @UP主 定向筛选、-排除词 与 #Tag 专项筛选，彻底净化搜索体验。
// @author       Kirosca
// @match        *://search.bilibili.com/*
// @run-at       document-start
// @grant        none
// @license      MIT

// ==/UserScript==

(function() {
    'use strict';

    // 1. 预注入 CSS 规则：秒杀视频流中的商业推广与小火箭广告卡片
    const styleElement = document.createElement('style');
    styleElement.textContent = `
        div[class*="col_"]:has(.bili-video-card__info--ad, svg.bili-video-card__info--ad-creative, a[href*="cm.bilibili.com"]),
        .video-list-item:has(.bili-video-card__info--ad, svg.bili-video-card__info--ad-creative, a[href*="cm.bilibili.com"]) {
            display: none !important;
        }
    `;
    document.documentElement.appendChild(styleElement);

    // 2. 解析当前 URL 中的关键词分类 (普通词 / -排除词 / #Tag词 / @UP主词)
    function getSearchKeywords() {
        const params = new URLSearchParams(window.location.search);
        const rawParam = params.get('keyword') || '';
        const rawKeyword = decodeURIComponent(rawParam.replace(/\+/g, ' ')).trim().toLowerCase();
        if (!rawKeyword) return { normal: [], exclude: [], tags: [], ups: [] };

        const list = rawKeyword.split(/\s+/);
        const normal = [];
        const exclude = [];
        const tags = [];
        const ups = [];

        for (const k of list) {
            if (k.startsWith('-') && k.length > 1) {
                exclude.push(k.substring(1));
            } else if (k.startsWith('#') && k.length > 1) {
                tags.push(k.substring(1));
            } else if (k.startsWith('@') && k.length > 1) {
                ups.push(k.substring(1));
            } else if (k) {
                normal.push(k);
            }
        }
        return { normal, exclude, tags, ups };
    }

    // 3. 提取发给 B 站接口的搜索词（🌟 智能脱壳：剔除 - 排除词，剥离 @ 与 # 前缀发给 B 站服务器以获取最大候选池）
    function getCleanApiKeyword() {
        const params = new URLSearchParams(window.location.search);
        const rawParam = params.get('keyword') || '';
        const rawKeyword = decodeURIComponent(rawParam.replace(/\+/g, ' ')).trim();
        if (!rawKeyword) return '';

        const list = rawKeyword.split(/\s+/);
        const searchTerms = [];
        for (const k of list) {
            if (k.startsWith('-')) {
                continue; // 排除词不发
            } else if (k.startsWith('@') || k.startsWith('#')) {
                if (k.length > 1) searchTerms.push(k.substring(1)); // 🌟 脱壳去除符号前缀发送
            } else if (k) {
                searchTerms.push(k);
            }
        }
        return searchTerms.join(' ');
    }

    // 4. 网络层拦截：存储 Tag 字典 + 接口层物理剔除广告
    const videoTagMap = new Map();

    function cleanAdsOnly(list) {
        if (!Array.isArray(list)) return list;

        return list.filter(v => {
            if (!v || typeof v !== 'object') return true;

            const id = v.bvid || v.aid || v.id || v.season_id || v.roomid;
            const rawTags = (v.tag || v.keywords || v.tags || '').toLowerCase();
            if (id) videoTagMap.set(String(id), rawTags);

            if (v.is_ad_loc || v.is_promoted || v.goto === 'ad' || v.type === 'ad') return false;

            return true;
        });
    }

    const originFetch = window.fetch;
    window.fetch = async function(...args) {
        let urlStr = '';
        if (typeof args[0] === 'string') {
            urlStr = args[0];
        } else if (args[0] && typeof args[0] === 'object') {
            urlStr = args[0].url || '';
        }

        const isSearchReq = urlStr.includes('/wbi/search') || urlStr.includes('/search/type') || urlStr.includes('/search/all');

        if (isSearchReq) {
            const apiKeyword = getCleanApiKeyword();
            if (apiKeyword) {
                urlStr = urlStr.replace(/([?&]keyword=)[^&]+/, `$1${encodeURIComponent(apiKeyword)}`);
                if (typeof args[0] === 'string') {
                    args[0] = urlStr;
                } else if (args[0] && typeof args[0] === 'object') {
                    args[0] = new Request(urlStr, args[0]);
                }
            }
        }

        const response = await originFetch.apply(this, args);
        if (!isSearchReq) return response;

        try {
            const clone = response.clone();
            const data = await clone.json();
            if (data?.data?.result) {
                if (Array.isArray(data.data.result)) {
                    if (data.data.result.length > 0 && data.data.result[0].data && Array.isArray(data.data.result[0].data)) {
                        for (const cat of data.data.result) {
                            if (cat.result_type === 'video' || cat.result_type === 'live_room' || !cat.result_type) {
                                cat.data = cleanAdsOnly(cat.data);
                            }
                        }
                    } else {
                        data.data.result = cleanAdsOnly(data.data.result);
                    }
                }

                return new Response(JSON.stringify(data), {
                    status: response.status,
                    statusText: response.statusText,
                    headers: response.headers
                });
            }
        } catch (_) {}

        return response;
    };

    // 5. DOM 层执行安检：覆盖【普通视频 / 课堂课程 / 直播间】
    let isProcessing = false;

    function filterDOMElements() {
        if (isProcessing) return;
        isProcessing = true;

        try {
            const { normal, exclude, tags, ups } = getSearchKeywords();
            if (!normal.length && !exclude.length && !tags.length && !ups.length) return;

            const elements = document.querySelectorAll('.bili-video-card, .video-list-item, div[class*="col_"], .bili-live-card');
            const processedCards = new Set();

            elements.forEach(el => {
                const card = el.closest('[class*="col_"], .video-list-item, .bili-live-card') || el;
                if (processedCards.has(card)) return;

                const linkEl = card.querySelector('a[href*="/video/"], a[href*="/cheese/"], a[href*="live.bilibili.com"], a[href*="/live/"]');
                if (!linkEl) return;
                processedCards.add(card);

                const titleEl = card.querySelector('h3.bili-video-card__info--tit, h3.bili-live-card__info--tit, a[title], .bili-video-card__info--tit, h3');
                if (!titleEl) return;

                const title = (titleEl.getAttribute('title') || titleEl.textContent || '').trim().toLowerCase();
                const link = linkEl.href || '';
                
                let id = '';
                const matchVideo = link.match(/\/(?:video|play)\/([A-Za-z0-9]+)/);
                const matchLive = link.match(/live\.bilibili\.com\/([0-9]+)/);
                if (matchVideo) id = matchVideo[1];
                else if (matchLive) id = matchLive[1];

                const videoTags = (videoTagMap.get(id) || '').toLowerCase();

                // 纯净提取作者名字并彻底剥离日期（如 "· 2-28"、"· 2天前"）
                let rawAuthor = '';
                const authorAnchor = card.querySelector('a[href*="space.bilibili.com"], .bili-video-card__info--owner, .up-name, .bili-live-card__info--uname');
                if (authorAnchor) {
                    const authorSpan = authorAnchor.querySelector('.bili-video-card__info--author, .bili-live-card__info--uname');
                    rawAuthor = authorSpan?.getAttribute('title') || authorSpan?.textContent || authorAnchor.getAttribute('title') || authorAnchor.textContent || '';
                } else {
                    const authorFallback = card.querySelector('span.bili-video-card__info--author, .bili-video-card__info--uname');
                    rawAuthor = authorFallback?.getAttribute('title') || authorFallback?.textContent || '';
                }
                const author = rawAuthor.replace(/[\s·•].*$/, '').trim().toLowerCase();

                let shouldHide = false;

                // 四道安检关卡
                if (exclude.some(k => title.includes(k))) {
                    shouldHide = true;
                } else if (normal.length && !normal.every(k => title.includes(k))) {
                    shouldHide = true;
                } else if (tags.length && !tags.every(k => videoTags.includes(k))) {
                    shouldHide = true;
                } else if (ups.length && !ups.some(k => author.includes(k))) {
                    shouldHide = true;
                }

                if (shouldHide) {
                    card.style.setProperty('display', 'none', 'important');
                } else {
                    card.style.removeProperty('display');
                }
            });
        } finally {
            isProcessing = false;
        }
    }

    // 6. 帧级节流监听：使用 requestAnimationFrame 防抖，CPU 占用 0%
    let rafId = null;
    const observer = new MutationObserver(() => {
        if (rafId) cancelAnimationFrame(rafId);
        rafId = requestAnimationFrame(filterDOMElements);
    });
    observer.observe(document.documentElement, { childList: true, subtree: true });

    console.log('[Bilibili 搜索净化] 2.0.0 智能脱壳召回版已启动。');
})();