// ==UserScript==
// @name         柳大师 - 学习助手
// @namespace    local.liudashi.study-helper
// @version      11.0.0
// @description  视频自动播放 + 课件翻页 + AI答题
// @author       柳大师
// @match        *://*.chaoxing.com/*
// @match        *://*.fanya.chaoxing.com/*
// @match        *://*.edu.cn/*
// @match        *://*.zhihuishu.com/*
// @grant        GM_setValue
// @grant        GM_getValue
// @grant        GM_xmlhttpRequest
// @grant        GM_registerMenuCommand
// @connect      open.bigmodel.cn
// @connect      *
// @run-at       document-idle
// ==/UserScript==

(function () {
    'use strict';
    if (window._lds_injected) return;
    window._lds_injected = true;

    const VERSION = '11.0.0';
    const IS_TOP = window.top === window.self;

    const CFG = {
        autoPlay: GM_getValue('lds_autoPlay', true),
        autoNext: GM_getValue('lds_autoNext', true),
        playbackRate: GM_getValue('lds_rate', 1.5),
        aiKey: GM_getValue('lds_aiKey', ''),
    };
    function saveCfg() { try { Object.keys(CFG).forEach(k => GM_setValue('lds_' + k, CFG[k])); } catch (e) {} }
    function setStatus(t) { const el = document.getElementById('lds-status'); if (el) el.textContent = t; }
    const log = (...a) => console.log('[柳大师]', ...a);

    // ========== 视频自动播放（每 2 秒检查）==========
    function autoPlayVideos() {
        if (!CFG.autoPlay) return;
        const videos = document.querySelectorAll('video');
        videos.forEach(v => {
            try {
                // 确保倍速正确
                if (Math.abs(v.playbackRate - CFG.playbackRate) > 0.01) {
                    v.playbackRate = CFG.playbackRate;
                }
                // 暂停的尝试播放
                if (v.paused && !v.ended) {
                    const p = v.play();
                    if (p && p.catch) {
                        p.catch(() => {
                            // 被浏览器拦截 → 静音重试
                            if (!v.muted) {
                                v.muted = true;
                                v.play().catch(() => {});
                            }
                        });
                    }
                }
            } catch (e) {}
        });
    }

    // ========== 课件自动翻页（每 5 秒检查）==========
    let lastPptClick = 0;
    function autoFlipPpt() {
        if (!CFG.autoNext) return;
        const now = Date.now();
        if (now - lastPptClick < 4000) return; // 防止点太快

        const nextSels = [
            '.next-btn', '.nextBtn', '.btn-next', '.ppt_next', '.slide-next',
            '[class*="next-page"]', '[class*="nextPage"]', '[class*="next_page"]',
            '[title*="下一页"]', '[aria-label*="下一页"]',
            '.arrow-right', '.icon-next',
        ];

        // 主文档
        for (const sel of nextSels) {
            try {
                const btns = document.querySelectorAll(sel);
                for (const b of btns) {
                    const txt = (b.textContent || '').trim();
                    const title = (b.getAttribute('title') || b.getAttribute('aria-label') || '').trim();
                    if (/上一页|prev/i.test(txt + title)) continue;
                    if (b.disabled) continue;
                    if (b.offsetParent === null) continue;
                    b.click();
                    lastPptClick = now;
                    log('📄 点击下一页:', sel);
                    return;
                }
            } catch (e) {}
        }

        // iframe 内
        const iframes = document.querySelectorAll('iframe');
        for (const ifr of iframes) {
            try {
                const d = ifr.contentDocument;
                if (!d) continue;
                for (const sel of nextSels) {
                    const btns = d.querySelectorAll(sel);
                    for (const b of btns) {
                        const txt = (b.textContent || '').trim();
                        const title = (b.getAttribute('title') || b.getAttribute('aria-label') || '').trim();
                        if (/上一页|prev/i.test(txt + title)) continue;
                        if (b.disabled || b.offsetParent === null) continue;
                        b.click();
                        lastPptClick = now;
                        log('📄 点击 iframe 下一页:', sel);
                        return;
                    }
                }
            } catch (e) {}
        }
    }

    // ========== 视频结束 → 下一节 ==========
    function onVideoEnded() {
        if (!CFG.autoNext) return;
        const now = Date.now();
        if (now - lastPptClick < 30000) return;
        lastPptClick = now;
        setStatus('切换下一节...');
        log('视频结束，尝试跳转下一节');

        // 延迟 5 秒后尝试点击
        setTimeout(() => {
            const nextSels = [
                '.next', '.next-btn', '.nextSection', '.next-section',
                '.chapter-next', '.section-next', '#nextBtn',
                '[class*="nextBtn"]', '[class*="next"] button',
                '[title*="下一"]', 'a[href*="next"]',
            ];
            for (const sel of nextSels) {
                const b = document.querySelector(sel);
                if (b && b.offsetParent !== null && !b.disabled) {
                    b.click();
                    log('点击下一节:', sel);
                    return;
                }
            }
            // 文字匹配
            const clickables = document.querySelectorAll('a, button, span');
            for (const el of clickables) {
                const t = (el.textContent || '').trim();
                if (t.length <= 10 && /^下一[节章课]|继续学习/.test(t) && el.offsetParent !== null) {
                    el.click();
                    log('点击文字按钮:', t);
                    return;
                }
            }
        }, 5000);
    }

    // 监听视频 ended
    function bindVideoEnded() {
        document.querySelectorAll('video').forEach(v => {
            if (v._ldsBound) return;
            v._ldsBound = true;
            v.addEventListener('ended', onVideoEnded);
        });
    }

    // ========== UI ==========
    function createUI() {
        if (!IS_TOP) return;

        // 清理所有旧版本 + 旧实例
        ['lds-ball', 'lds-panel', 'sh-ui-host', 'sh-ball', 'sh-sidebar', 'test-ball']
            .forEach(id => document.querySelectorAll('#' + id).forEach(el => el.remove()));

        if (!document.body) { setTimeout(createUI, 500); return; }

        // ===== 悬浮球 =====
        const ball = document.createElement('div');
        ball.id = 'lds-ball';
        ball.textContent = '🤓';
        ball.style.cssText = 'position:fixed;right:24px;top:100px;width:56px;height:56px;border-radius:50%;' +
            'background:linear-gradient(135deg,#2f6feb,#5b8dff);color:#fff;font-size:32px;' +
            'display:flex;align-items:center;justify-content:center;cursor:pointer;' +
            'z-index:2147483647;box-shadow:0 4px 16px rgba(47,111,235,0.5);user-select:none;';
        document.body.appendChild(ball);
        log('✅ 悬浮球已创建');

        // ===== 面板 =====
        const panel = document.createElement('div');
        panel.id = 'lds-panel';
        panel.style.cssText = 'position:fixed;right:0;top:0;width:480px;height:100vh;background:#fff;' +
            'z-index:2147483646;box-shadow:-4px 0 24px rgba(0,0,0,0.15);' +
            'transform:translateX(100%);transition:transform 0.3s ease;' +
            'display:flex;flex-direction:column;font-family:-apple-system,"Microsoft YaHei",sans-serif;' +
            'color:#1f2328;font-size:15px;';
        panel.innerHTML =
            '<div style="padding:20px 24px;background:linear-gradient(135deg,#2f6feb,#5b8dff);color:#fff;display:flex;justify-content:space-between;align-items:center;">' +
                '<div>' +
                    '<div style="font-size:20px;font-weight:700;">柳大师</div>' +
                    '<div style="font-size:12px;opacity:0.85;margin-top:2px;">学习助手 v' + VERSION + '</div>' +
                '</div>' +
                '<div id="lds-close" style="cursor:pointer;font-size:26px;padding:0 12px;line-height:1;">×</div>' +
            '</div>' +
            '<div style="flex:1;overflow-y:auto;padding:20px 24px;">' +
                '<div style="margin-bottom:24px;">' +
                    '<div style="font-size:22px;font-weight:700;margin-bottom:8px;">嗨，我是柳大师 😎</div>' +
                    '<div style="font-size:14px;color:#57606a;">很愉快陪你共同学习！</div>' +
                '</div>' +
                '<div style="display:flex;flex-direction:column;gap:12px;">' +
                    // 自动播放
                    '<div style="padding:14px 16px;background:#f8faff;border-radius:12px;display:flex;justify-content:space-between;align-items:center;">' +
                        '<div>' +
                            '<div style="font-size:15px;font-weight:600;">自动播放视频</div>' +
                            '<div style="font-size:12px;color:#8b949e;margin-top:2px;">检测到视频自动播放</div>' +
                        '</div>' +
                        '<label style="position:relative;width:44px;height:24px;cursor:pointer;">' +
                            '<input type="checkbox" id="lds-cb-autoplay" ' + (CFG.autoPlay ? 'checked' : '') + ' style="opacity:0;width:0;height:0;">' +
                            '<span class="lds-slider" style="position:absolute;inset:0;border-radius:12px;transition:.2s;background:' + (CFG.autoPlay ? '#2f6feb' : '#cfd4da') + ';"></span>' +
                        '</label>' +
                    '</div>' +
                    // 自动跳转
                    '<div style="padding:14px 16px;background:#f8faff;border-radius:12px;display:flex;justify-content:space-between;align-items:center;">' +
                        '<div>' +
                            '<div style="font-size:15px;font-weight:600;">自动跳转下一节</div>' +
                            '<div style="font-size:12px;color:#8b949e;margin-top:2px;">视频播完/课件刷完自动下一节</div>' +
                        '</div>' +
                        '<label style="position:relative;width:44px;height:24px;cursor:pointer;">' +
                            '<input type="checkbox" id="lds-cb-autonext" ' + (CFG.autoNext ? 'checked' : '') + ' style="opacity:0;width:0;height:0;">' +
                            '<span class="lds-slider" style="position:absolute;inset:0;border-radius:12px;transition:.2s;background:' + (CFG.autoNext ? '#2f6feb' : '#cfd4da') + ';"></span>' +
                        '</label>' +
                    '</div>' +
                    // 倍速
                    '<div style="padding:14px 16px;background:#f8faff;border-radius:12px;">' +
                        '<div style="font-size:15px;font-weight:600;margin-bottom:10px;">视频倍速</div>' +
                        '<div style="display:flex;gap:8px;flex-wrap:wrap;">' +
                            [1, 1.25, 1.5, 2, 2.5, 4].map(r =>
                                '<button class="lds-rate" data-rate="' + r + '" style="padding:6px 14px;border-radius:6px;' +
                                'border:1px solid ' + (CFG.playbackRate == r ? '#2f6feb' : '#eaeef2') + ';' +
                                'background:' + (CFG.playbackRate == r ? '#eef3ff' : '#fff') + ';' +
                                'color:' + (CFG.playbackRate == r ? '#2f6feb' : '#57606a') + ';' +
                                'font-size:13px;cursor:pointer;">' + r + 'x</button>'
                            ).join('') +
                        '</div>' +
                    '</div>' +
                    // API Key
                    '<div style="padding:14px 16px;background:#f8faff;border-radius:12px;">' +
                        '<div style="font-size:15px;font-weight:600;margin-bottom:8px;">AI API Key（可选）</div>' +
                        '<div style="font-size:12px;color:#8b949e;margin-bottom:8px;">填入智谱 GLM-4-Flash 的 Key（完全免费）</div>' +
                        '<input type="text" id="lds-input-key" value="' + CFG.aiKey + '" placeholder="粘贴 API Key" style="width:100%;padding:10px 14px;border-radius:8px;border:1px solid #d0d7de;font-size:14px;outline:none;box-sizing:border-box;">' +
                        '<div style="display:flex;gap:8px;margin-top:8px;">' +
                            '<button id="lds-save-key" style="flex:1;padding:10px;border-radius:8px;border:none;background:#2f6feb;color:#fff;font-size:14px;font-weight:600;cursor:pointer;">保存</button>' +
                            '<button id="lds-open-zhipu" style="flex:1;padding:10px;border-radius:8px;border:1px solid #2f6feb;background:transparent;color:#2f6feb;font-size:14px;font-weight:600;cursor:pointer;">去注册</button>' +
                        '</div>' +
                    '</div>' +
                '</div>' +
            '</div>' +
            '<div style="padding:16px 24px;border-top:1px solid #f0f2f5;display:flex;align-items:center;gap:8px;">' +
                '<div style="width:8px;height:8px;border-radius:50%;background:#10b981;"></div>' +
                '<span id="lds-status" style="font-size:13px;color:#57606a;">待机</span>' +
            '</div>';
        document.body.appendChild(panel);
        log('✅ 面板已创建');

        // ===== 事件绑定 =====
        ball.onclick = function () {
            ball.style.display = 'none';
            panel.style.transform = 'translateX(0)';
        };

        document.getElementById('lds-close').onclick = function () {
            panel.style.transform = 'translateX(100%)';
            setTimeout(function () { ball.style.display = 'flex'; }, 300);
        };

        var bindToggle = function (id, key) {
            var el = document.getElementById(id);
            el.onchange = function () {
                CFG[key] = el.checked;
                saveCfg();
                var s = el.nextElementSibling;
                s.style.background = el.checked ? '#2f6feb' : '#cfd4da';
            };
        };
        bindToggle('lds-cb-autoplay', 'autoPlay');
        bindToggle('lds-cb-autonext', 'autoNext');

        document.querySelectorAll('.lds-rate').forEach(function (btn) {
            btn.onclick = function () {
                var rate = parseFloat(btn.dataset.rate);
                CFG.playbackRate = rate;
                saveCfg();
                document.querySelectorAll('.lds-rate').forEach(function (b) {
                    var active = parseFloat(b.dataset.rate) === rate;
                    b.style.borderColor = active ? '#2f6feb' : '#eaeef2';
                    b.style.background = active ? '#eef3ff' : '#fff';
                    b.style.color = active ? '#2f6feb' : '#57606a';
                });
                document.querySelectorAll('video').forEach(function (v) {
                    try { v.playbackRate = rate; } catch (e) {}
                });
            };
        });

        document.getElementById('lds-save-key').onclick = function () {
            CFG.aiKey = document.getElementById('lds-input-key').value.trim();
            saveCfg();
            alert('✅ 已保存');
        };
        document.getElementById('lds-open-zhipu').onclick = function () {
            window.open('https://open.bigmodel.cn/', '_blank');
        };
    }

    // ========== 启动 ==========
    function start() {
        // 只在顶层创建 UI
        if (IS_TOP) {
            // 立即尝试 + 兜底重试
            setTimeout(createUI, 800);
            setTimeout(function () {
                if (!document.getElementById('lds-ball')) {
                    log('⚠️ 首次创建失败，重试...');
                    createUI();
                }
            }, 3000);
            setTimeout(function () {
                if (!document.getElementById('lds-ball')) {
                    log('⚠️ 二次创建失败，再重试...');
                    createUI();
                }
            }, 8000);
        }

        // 视频事件绑定
        setInterval(bindVideoEnded, 3000);

        // 主循环
        setInterval(autoPlayVideos, 2000);   // 视频自动播放：2 秒
        setInterval(autoFlipPpt, 5000);      // 课件翻页：5 秒

        log('✅ 启动完成 | v' + VERSION + ' | 顶层=' + IS_TOP);
    }

    if (document.body) {
        start();
    } else {
        document.addEventListener('DOMContentLoaded', start);
    }

    // ========== 菜单 ==========
    try {
        GM_registerMenuCommand('🔄 重新创建 UI', function () {
            ['lds-ball', 'lds-panel'].forEach(function (id) {
                document.querySelectorAll('#' + id).forEach(function (el) { el.remove(); });
            });
            createUI();
        });
        GM_registerMenuCommand('📊 查看诊断信息', function () {
            var v = document.querySelectorAll('video').length;
            var ifr = document.querySelectorAll('iframe').length;
            var ball = !!document.getElementById('lds-ball');
            var panel = !!document.getElementById('lds-panel');
            alert('视频数: ' + v + '\niframe数: ' + ifr + '\n悬浮球: ' + (ball ? '✓' : '✗') + '\n面板: ' + (panel ? '✓' : '✗') + '\n是否顶层: ' + IS_TOP);
        });
    } catch (e) {}
})();