// ==UserScript==
// @name         百度网盘换播放器

// @namespace    https://example.com
// @version      1.1.0
// @description  修复双播放器、按钮点击、音画同步问题
// @match        https://pan.baidu.com/s/*
// @match        http*://yun.baidu.com/s/*
// @require      https://unpkg.com/hls.js@1.6.16/dist/hls.min.js
// @grant        unsafeWindow
// @grant        GM_getValue
// @grant        GM_setValue
// @run-at       document-end
// ==/UserScript==

(function () {
    'use strict';

    const state = {
        share_uk: '', shareid: '', sign: '', timestamp: '', jsToken: '',
        file: null, filelist: [], quality: [], adToken: '',
        hls: null, video: null, currentQuality: '480',
        playerContainer: null,
    };

    /* ============================================================
     *  工具函数
     * ============================================================ */
    function waitForLocals(callback) {
        if (unsafeWindow.locals && unsafeWindow.locals.get) {
            unsafeWindow.locals.get("file_list", function (list) {
                if (list && list.length) callback();
                else setTimeout(() => waitForLocals(callback), 500);
            });
        } else {
            setTimeout(() => waitForLocals(callback), 300);
        }
    }

    function buildStreamUrl(type) {
        return "/share/streaming?channel=chunlei"
            + "&uk=" + state.share_uk
            + "&fid=" + state.file.fs_id
            + "&sign=" + state.sign
            + "&timestamp=" + state.timestamp
            + "&shareid=" + state.shareid
            + "&type=" + type + "&vip=0&jsToken=" + state.jsToken
            + (state.adToken ? "&adToken=" + encodeURIComponent(state.adToken) : "");
    }

    function fetchAdToken() {
        return fetch(buildStreamUrl("M3U8_AUTO_480"))
            .then(r => r.json())
            .then(data => {
                if (data.errno === 133 && data.adToken) state.adToken = data.adToken;
                return state.adToken;
            });
    }

    function buildQualityList() {
        const resolution = state.file.resolution || "";
        const match = resolution.match(/width:(\d+),height:(\d+)/);
        const pixels = match ? (+match[1]) * (+match[2]) : 0;
        const levels = [480, 360];
        if (pixels > 409920) levels.unshift(720);
        if (pixels > 921600) levels.unshift(1080);
        const labels = { 1080: "超清 1080P", 720: "高清 720P", 480: "流畅 480P", 360: "省流 360P" };
        state.quality = levels.map(q => ({ level: q, label: labels[q], type: "M3U8_AUTO_" + q }));
    }

    function getShareId() {
        return (/baidu.com\/(?:s\/1|(?:share|wap)\/init\?surl=)([\w-]{5,25})/.exec(location.href) || [])[1] || "";
    }

    function buildFileList() {
        const cached = JSON.parse(sessionStorage.getItem(getShareId()) || "[]");
        let list = cached.length ? cached.filter(i => i.category === 1) : [];
        if (state.file && !list.find(i => i.fs_id === state.file.fs_id)) list.unshift(state.file);
        state.filelist = list.map(item => ({
            fs_id: item.fs_id,
            name: item.server_filename || item.name || "未知视频",
            isCurrent: item.fs_id === state.file.fs_id,
        }));
        state.filelist.sort((a, b) =>
            a.name.localeCompare(b.name, undefined, { numeric: true, sensitivity: 'base' })
        );
    }

    function observeFileList() {
        try {
            const ctx = unsafeWindow.require('system-core:context/context.js');
            const currentList = ctx.instanceForSystem.list.getCurrentList();
            if (currentList && currentList.length) {
                sessionStorage.setItem(getShareId(), JSON.stringify(currentList));
            }
        } catch (e) { }
    }

    /* ============================================================

     * ============================================================ */
    function destroyNativePlayer() {
        // 1. 调用原生播放器实例的 dispose，停止播放并释放资源
        try {
            if (unsafeWindow.require && unsafeWindow.require.async) {
                unsafeWindow.require.async("file-widget-1:videoPlay/context.js", function (context) {
                    let count = 0;
                    const id = setInterval(function () {
                        const playerInstance = context && context.getContext && context.getContext().playerInstance;
                        if (playerInstance && playerInstance.player) {
                            clearInterval(id);
                            try { playerInstance.player.dispose(); } catch (e) { }
                            playerInstance.player = false;
                        } else if (++count > 60) {
                            clearInterval(id);
                        }
                    }, 300);
                });
            }
        } catch (e) { }

        // 2. 停止页面上所有原生 video 标签
        document.querySelectorAll('video').forEach(v => {
            try { v.pause(); v.src = ''; v.load(); } catch (e) { }
        });
    }

    /* ============================================================
   
     * ============================================================ */
    function createPlayerUI() {
        const nativeWrap = document.querySelector("#video-wrap");
        if (!nativeWrap) {
            setTimeout(createPlayerUI, 400);
            return;
        }

        // 先销毁原生播放器实例
        destroyNativePlayer();

        // 删除原生容器后面的兄弟节点（百度经常在旁边挂广告/推荐层）
        while (nativeWrap.nextSibling) {
            nativeWrap.parentNode.removeChild(nativeWrap.nextSibling);
        }

        // 创建我们自己的容器，替换掉原生 #video-wrap
        const container = document.createElement("div");
        container.id = "custom-bd-player";
        container.style.cssText = "width:100%;height:100%;position:relative;background:#000;";
        nativeWrap.parentNode.replaceChild(container, nativeWrap);
        // 关键：父容器 z-index 设为 auto，避免被其他层盖住
        container.parentNode.style.cssText += 'z-index:auto;position:relative;';
        state.playerContainer = container;

        // --- 视频元素 ---
        const video = document.createElement('video');
        video.id = 'custom-bd-video';
        video.controls = true;
        video.playsInline = true;
        video.style.cssText = 'width:100%;height:100%;object-fit:contain;background:#000;display:block;';
        container.appendChild(video);
        state.video = video;

        // --- 顶部工具栏（z-index 拉满 + pointer-events 确保可点击）---
        const toolbar = document.createElement('div');
        toolbar.style.cssText = `
            position:absolute;top:12px;right:12px;z-index:99999;
            display:flex;gap:8px;align-items:center;pointer-events:auto;
        `;
        container.appendChild(toolbar);

        // 倍速
        const savedRate = GM_getValue('bd_playback_rate', '1.0x');
        const speedBtn = createDropdown(savedRate,
            ['0.5x', '0.75x', '1.0x', '1.25x', '1.5x', '2.0x', '3.0x'],
            (val) => {
                video.playbackRate = parseFloat(val);
                GM_setValue('bd_playback_rate', val);
            }
        );
        toolbar.appendChild(speedBtn);

        // 清晰度
        const qualityBtn = createDropdown('清晰度',
            state.quality.map(q => q.label),
            (label) => {
                const q = state.quality.find(item => item.label === label);
                if (q) switchQuality(q.level);
            }
        );
        toolbar.appendChild(qualityBtn);

        // 播放列表
        const listBtn = document.createElement('button');
        listBtn.textContent = '列表';
        listBtn.style.cssText = btnStyle();
        listBtn.onclick = (e) => { e.stopPropagation(); togglePlaylist(); };
        toolbar.appendChild(listBtn);

        // --- 播放列表抽屉 ---
        const playlist = document.createElement('div');
        playlist.id = 'custom-bd-playlist';
        playlist.style.cssText = `
            position:absolute;top:0;right:0;width:280px;height:100%;
            background:rgba(0,0,0,0.95);color:#fff;z-index:99998;
            transform:translateX(100%);transition:transform .3s;
            overflow-y:auto;font-size:13px;pointer-events:auto;
        `;
        renderPlaylistItems(playlist);
        container.appendChild(playlist);
    }

    /* ============================================================

     * ============================================================ */
    function createDropdown(currentLabel, options, onSelect) {
        const wrap = document.createElement('div');
        wrap.style.cssText = 'position:relative;';

        const btn = document.createElement('button');
        btn.className = 'dd-label';
        btn.textContent = currentLabel;
        btn.style.cssText = btnStyle();
        wrap.appendChild(btn);

        const menu = document.createElement('div');
        menu.className = 'dd-menu';
        menu.style.cssText = `
            position:absolute;top:calc(100% + 6px);right:0;
            background:rgba(20,20,20,0.95);border-radius:6px;
            min-width:90px;display:none;z-index:100000;
            box-shadow:0 4px 16px rgba(0,0,0,0.5);
            border:1px solid rgba(255,255,255,0.1);
        `;
        options.forEach(opt => {
            const item = document.createElement('div');
            item.textContent = opt;
            item.style.cssText = `
                padding:8px 14px;cursor:pointer;color:#fff;white-space:nowrap;
                font-size:12px;
            `;
            item.onmouseenter = () => item.style.background = 'rgba(255,255,255,0.12)';
            item.onmouseleave = () => item.style.background = 'transparent';
            item.onclick = (e) => {
                e.stopPropagation();
                onSelect(opt);
                btn.textContent = opt;
                menu.style.display = 'none';
            };
            menu.appendChild(item);
        });
        wrap.appendChild(menu);

        // 点击按钮切换菜单
        btn.onclick = (e) => {
            e.stopPropagation();
            // 先关闭所有其他菜单
            document.querySelectorAll('.dd-menu').forEach(m => {
                if (m !== menu) m.style.display = 'none';
            });
            menu.style.display = menu.style.display === 'block' ? 'none' : 'block';
        };

        // 点击页面其他地方关闭菜单
        document.addEventListener('click', (e) => {
            if (!wrap.contains(e.target)) menu.style.display = 'none';
        });

        return wrap;
    }

    function btnStyle() {
        return `
            padding:5px 12px;background:rgba(0,0,0,0.65);color:#fff;
            border:1px solid rgba(255,255,255,0.25);border-radius:6px;
            cursor:pointer;font-size:12px;pointer-events:auto;
            backdrop-filter:blur(6px);user-select:none;
        `;
    }

    function renderPlaylistItems(container) {
        container.innerHTML = '';
        const header = document.createElement('div');
        header.textContent = '播放列表（' + state.filelist.length + '）';
        header.style.cssText = 'padding:14px;font-weight:bold;border-bottom:1px solid rgba(255,255,255,0.1);position:sticky;top:0;background:rgba(0,0,0,0.95);';
        container.appendChild(header);

        state.filelist.forEach(item => {
            const row = document.createElement('div');
            row.textContent = item.name;
            row.style.cssText = `
                padding:11px 14px;cursor:pointer;
                border-bottom:1px solid rgba(255,255,255,0.05);
                ${item.isCurrent ? 'color:#4fc3f7;background:rgba(79,195,247,0.12);' : 'color:#ccc;'}
            `;
            row.onclick = () => {
                location.href = "https://pan.baidu.com" + location.pathname + "?fid=" + item.fs_id;
            };
            container.appendChild(row);
        });
    }

    function togglePlaylist() {
        const pl = document.getElementById('custom-bd-playlist');
        if (!pl) return;
        pl.style.transform = pl.style.transform === 'translateX(0px)'
            ? 'translateX(100%)' : 'translateX(0px)';
    }

    /* ============================================================
    
     * ============================================================ */
    function loadVideo(qualityLevel) {
        state.currentQuality = qualityLevel;
        const q = state.quality.find(item => item.level === qualityLevel) || state.quality[0];
        const url = buildStreamUrl(q.type);

        const currentTime = state.video ? state.video.currentTime : 0;
        const wasPlaying = state.video && !state.video.paused;

        // 彻底销毁旧实例
        if (state.hls) {
            state.hls.destroy();
            state.hls = null;
        }

        if (Hls.isSupported()) {
            state.hls = new Hls({
                enableWorker: true,        // 启用 Worker，解码不卡主线程
                lowLatencyMode: false,     // 关闭低延迟模式（点播场景不需要，避免音画不同步）
                backBufferLength: 90,      // 增大回溯缓冲
                maxBufferLength: 30,       // 前向缓冲 30 秒
                maxMaxBufferLength: 60,    // 最大缓冲 60 秒
                startLevel: -1,            // 自动选择起始码率
                capLevelToPlayerSize: true,// 根据播放器尺寸限制码率
            });
            state.hls.loadSource(url);
            state.hls.attachMedia(state.video);
            state.hls.on(Hls.Events.MANIFEST_PARSED, () => {
                state.video.currentTime = currentTime;
                if (wasPlaying) state.video.play().catch(() => { });
            });
            // 错误恢复
            state.hls.on(Hls.Events.ERROR, (event, data) => {
                if (data.fatal) {
                    switch (data.type) {
                        case Hls.ErrorTypes.NETWORK_ERROR:
                            state.hls.startLoad();
                            break;
                        case Hls.ErrorTypes.MEDIA_ERROR:
                            state.hls.recoverMediaError();
                            break;
                        default:
                            state.hls.destroy();
                            break;
                    }
                }
            });
        } else {
            state.video.src = url;
            state.video.currentTime = currentTime;
            if (wasPlaying) state.video.play().catch(() => { });
        }
    }

    function switchQuality(level) {
        loadVideo(level);
    }

    /* ============================================================
     *  入口
     * ============================================================ */
    function main() {
        waitForLocals(function () {
            unsafeWindow.locals.get(
                "file_list", "share_uk", "shareid", "sign", "timestamp",
                function (file_list, share_uk, shareid, sign, timestamp) {
                    if (!file_list || !file_list.length) return;

                    state.share_uk = share_uk;
                    state.shareid = shareid;
                    state.sign = sign;
                    state.timestamp = timestamp;
                    state.jsToken = unsafeWindow.jsToken || '';

                    if (file_list.length === 1 && file_list[0].category === 1) {
                        state.file = file_list[0];
                        startPlayback();
                    } else {
                        observeFileList();
                        document.addEventListener('click', () => setTimeout(observeFileList, 600), true);
                    }
                }
            );
        });
    }

    function startPlayback() {
        fetchAdToken().then(() => {
            buildQualityList();
            buildFileList();
            createPlayerUI();
            // 等待 video 元素挂载
            const waitVideo = setInterval(() => {
                if (state.video) {
                    clearInterval(waitVideo);
                    loadVideo(state.currentQuality);
                    showToast("增强播放器已就绪");
                }
            }, 200);
        });
    }

    function showToast(msg) {
        const tip = document.createElement('div');
        tip.textContent = msg;
        tip.style.cssText = `
            position:fixed;top:24px;left:50%;transform:translateX(-50%);
            background:rgba(0,0,0,0.85);color:#fff;padding:10px 24px;
            border-radius:6px;z-index:999999;font-size:14px;pointer-events:none;
        `;
        document.body.appendChild(tip);
        setTimeout(() => tip.remove(), 2500);
    }

    main();
})();