// ==UserScript==
// @name         国家开放大学实验学院/全网办/乡村振兴学院加速自动刷视频
// @namespace    ouchn-syxy-auto
// @version      2.2.4
// @description  国开实验学院全自动刷课，支持倍速切换、自动翻页、自动续跑
// @author       去有风的地方
// @match        *://moodle.syxy.ouchn.cn/*
// @grant        none
// @run-at       document-end
// @license All Rights Reserved
// ==/UserScript==

(function () {
    'use strict';

    const CONFIG = {
        speed: 2,
        mute: true,
        delay: 1800,          // 课页内翻页延迟(ms)
        apiInterval: 2500     // API模式：每节课之间的间隔(ms)，防触发风控
    };

    let logBox;
    let isDragging = false;
    let offsetX, offsetY;
    let stopFlag = false;

    // ---------- 日志 ----------
    function log(msg, type = "info") {
        const t = new Date().toLocaleTimeString();
        const color = { info: "#88ccff", success: "#73d18c", warn: "#ffd173", error: "#ff7373" }[type];
        if (logBox) {
            logBox.innerHTML += `<div style="color:${color}">[${t}] ${msg}</div>`;
            logBox.scrollTop = logBox.scrollHeight;
        }
        console.log(`[全自动程序] ${msg}`);
    }

    // ---------- 拖拽 ----------
    function makeDraggable(el) {
        el.style.cursor = "move";
        el.addEventListener("mousedown", e => {
            isDragging = true;
            offsetX = e.clientX - el.getBoundingClientRect().left;
            offsetY = e.clientY - el.getBoundingClientRect().top;
        });
        document.addEventListener("mousemove", e => {
            if (!isDragging) return;
            el.style.left = e.clientX - offsetX + "px";
            el.style.top = e.clientY - offsetY + "px";
            el.style.right = "auto";
        });
        document.addEventListener("mouseup", () => isDragging = false);
    }

    const sleep = ms => new Promise(r => setTimeout(r, ms));

    // ---------- 控制面板 ----------
    function createPanel(showApiBtn) {
        const panel = document.createElement("div");
        panel.style = `
            position:fixed;top:20px;right:20px;z-index:9999999;
            width:340px;background:#1f2937;color:#fff;padding:14px;border-radius:12px;
            box-shadow:0 4px 20px rgba(0,0,0,0.3);font-size:13px;user-select:none;
        `;
        panel.innerHTML = `
            <div style="font-weight:bold;text-align:center;margin-bottom:12px;font-size:15px">国开实验学院全自动程序 v3.0</div>

            <div style="margin:8px 0;display:flex;align-items:center;justify-content:space-between;">
                <span>播放倍速</span>
                <select id="speedSel" style="padding:4px 8px;border-radius:4px;background:#2d3748;color:#fff;border:1px solid #444;">
                    <option value="1">1.0x</option>
                    <option value="1.5">1.5x</option>
                    <option value="2" selected>2.0x</option>
                    <option value="3">3.0x</option>
                    <option value="4">4.0x</option>
                </select>
            </div>

            <div style="margin:8px 0">
                <label style="display:flex;align-items:center;gap:8px">
                    <input type="checkbox" id="autoStart" checked> 页面加载自动执行(以下模式二选一)
                </label>
            </div>

            ${showApiBtn ? `
            <button id="apiBtn" style="width:100%;padding:10px;background:#3b82f6;color:#fff;border:none;border-radius:6px;cursor:pointer;margin-top:5px;font-weight:bold;">
                ⚡ 一键完成本课程全部
            </button>` : ""}

            <button id="startBtn" style="width:100%;padding:10px;background:#22c555;color:#fff;border:none;border-radius:6px;cursor:pointer;margin-top:5px;font-weight:bold;">
                视频播放页面挂机模式
            </button>

            <button id="stopBtn" style="width:100%;padding:6px;background:#ef4444;color:#fff;border:none;border-radius:6px;cursor:pointer;margin-top:6px;">
                停止
            </button>

            <div id="logBox" style="height:130px;overflow-y:auto;background:#111827;padding:8px;border-radius:6px;font-size:12px;margin-top:10px;"></div>

            <div style="text-align:center;margin-top:12px;line-height:1.8;">
                <div style="color:#ffffff;font-weight:900;font-size:14px;letter-spacing:1px;text-shadow:0 0 6px rgba(255,255,255,0.35);">答题或批量合作，联系Q：640105435</div>
                <div style="color:#ffffff;font-weight:900;font-size:14px;letter-spacing:1px;text-shadow:0 0 6px rgba(255,255,255,0.35);">Q群1：949193546丨Q群2：756253160</div>
            </div>
        `;
        document.body.appendChild(panel);
        makeDraggable(panel);

        logBox = document.getElementById("logBox");
        document.getElementById("startBtn").onclick = startAll;
        document.getElementById("stopBtn").onclick = () => { stopFlag = true; log("⏹ 已请求停止，当前任务结束后停下", "warn"); };
        document.getElementById("speedSel").onchange = e => {
            CONFIG.speed = Number(e.target.value);
            log(`已切换倍速：${CONFIG.speed}x`);
        };
        if (showApiBtn) document.getElementById("apiBtn").onclick = apiCompleteAll;
    }

    // =========================================================
    // 模式一：API 直连批量完成（在课程首页使用）
    // =========================================================

    // 获取视频真实时长（只加载元数据，不下载视频）
    function getVideoDuration(uploadid) {
        return new Promise(resolve => {
            const v = document.createElement("video");
            v.preload = "metadata";
            v.muted = true;
            const timer = setTimeout(() => { v.src = ""; resolve(0); }, 8000);
            v.onloadedmetadata = () => { clearTimeout(timer); resolve(v.duration || 0); };
            v.onerror = () => { clearTimeout(timer); resolve(0); };
            v.src = `/local/one/video_preview.php?uploadid=${uploadid}`;
        });
    }

    // 抓取单个课页并上报完成
    async function processPage(id, title) {
        // 1. 访问页面（服务器会记录"已查看"，文档页到此即完成）
        const resp = await fetch(`/mod/page/view.php?id=${id}&forceview=1`, { credentials: "include" });
        const html = await resp.text();

        // 2. 提取视频追踪参数
        const mKey = html.match(/videokey:\s*'(\d+_\d+_\d+)'/);
        const mSign = html.match(/sign:\s*'([0-9a-f]{32})'/);
        const mUp = html.match(/video_preview\.php\?uploadid=(\d+)/);

        if (!mKey || !mSign) {
            log(`📄 [${id}] ${title} —— 纯文档页，已标记查看`, "success");
            return true;
        }

        // 3. 有视频：获取真实时长后上报"看到结尾"
        let duration = 0;
        if (mUp) duration = await getVideoDuration(mUp[1]);
        const position = duration > 10 ? Math.floor(duration - 1) : 99999;

        const r = await fetch("/customscripts/mod/playbackposition.php", {
            method: "POST",
            credentials: "include",
            headers: { "Content-Type": "application/json" },
            body: JSON.stringify({ position, videokey: mKey[1], sign: mSign[1] })
        });

        if (r.ok) {
            log(`🎬 [${id}] ${title} —— 视频已上报完成(时长${Math.round(duration)}s)`, "success");
            return true;
        } else {
            log(`⚠️ [${id}] ${title} —— 上报返回 ${r.status}，建议用挂机模式补刷`, "warn");
            return false;
        }
    }

    async function apiCompleteAll() {
        stopFlag = false;
        document.getElementById("apiBtn").disabled = true;
        log("===== API 批量完成开始 =====");

        // 从当前课程首页收集所有 mod/page 链接（视频/文档都是"网页"类型）
        const seen = new Set();
        const items = [];
        document.querySelectorAll('a[href*="/mod/page/view.php"]').forEach(a => {
            const m = a.href.match(/id=(\d+)/);
            if (m && !seen.has(m[1])) {
                seen.add(m[1]);
                const title = (a.textContent || "").trim().replace(/\s*网页\s*$/, "").slice(0, 30);
                items.push({ id: m[1], title });
            }
        });

        if (items.length === 0) {
            log("❌ 当前页未找到课程章节链接，请到课程首页(course/view.php)再点此按钮", "error");
            document.getElementById("apiBtn").disabled = false;
            return;
        }

        log(`共发现 ${items.length} 个网页节，开始逐个处理...`);
        let ok = 0, fail = 0;
        for (let i = 0; i < items.length; i++) {
            if (stopFlag) { log("⏹ 已停止", "warn"); break; }
            try {
                const good = await processPage(items[i].id, items[i].title);
                good ? ok++ : fail++;
            } catch (e) {
                fail++;
                log(`❌ [${items[i].id}] ${items[i].title} —— ${e.message}`, "error");
            }
            log(`—— 进度 ${i + 1}/${items.length} ——`);
            await sleep(CONFIG.apiInterval);
        }

        log(`===== 完成：成功 ${ok}，失败/跳过 ${fail} =====`, ok > 0 ? "success" : "warn");
        log("提示：测验/作业/讨论需人工完成；2分钟后刷新首页查看进度", "info");
        document.getElementById("apiBtn").disabled = false;
    }

    // =========================================================
    // 模式二：课页挂机（自动播放+自动翻页，含第一页修复）
    // =========================================================

    async function autoScroll() {
        return new Promise(resolve => {
            log("正在自动浏览页面...");
            let pos = 0;
            const interval = setInterval(() => {
                window.scrollBy(0, 120);
                pos += 120;
                if (pos >= document.body.scrollHeight - 500) {
                    clearInterval(interval);
                    setTimeout(() => { log("✅ 页面处理完成", "success"); resolve(); }, 1000);
                }
            }, 120);
        });
    }

    async function playVideo() {
        return new Promise(async resolve => {
            let video = document.querySelector("video");
            if (!video) {
                for (const f of document.querySelectorAll("iframe")) {
                    try {
                        const v = f.contentDocument?.querySelector("video");
                        if (v) { video = v; break; }
                    } catch (e) { }
                }
            }
            if (!video) return resolve(false);

            video.playbackRate = CONFIG.speed;
            video.muted = CONFIG.mute;
            log(`检测到视频，${CONFIG.speed}倍速自动播放`);
            try { await video.play(); } catch (e) { }

            video.onended = () => {
                log("✅ 视频播放完毕", "success");
                goNext();
                resolve(true);
            };
            video.onpause = () => {
                if (!video.ended) setTimeout(() => video.play().catch(() => { }), 600);
            };
        });
    }

    // --- 修复：通用"下一页"按钮查找（原版写死哈希class导致第一页失效） ---
    function isVisible(el) {
        const r = el.getBoundingClientRect();
        return r.width > 0 && r.height > 0;
    }

    function findNextInDoc(doc) {
        if (!doc) return null;
        const candidates = [...doc.querySelectorAll('a[class*="newgk-next"], button[class*="newgk-next"], a[class*="next"], button[class*="next"]')];
        for (const el of candidates) {
            const cls = String(el.className || "");
            const txt = (el.textContent || "").trim();
            if (/prev|pre-|上一页|上一节/i.test(cls) || /上一页|上一节/.test(txt)) continue;
            if (isVisible(el)) return el;
        }
        const byText = [...doc.querySelectorAll("a, button")].filter(el => {
            const txt = (el.textContent || "").trim();
            return /^(下一页|下一节|下一步|继续学习)\s*[›»>]?$/.test(txt) && !/上一页|上一节/.test(txt) && isVisible(el);
        });
        return byText[0] || null;
    }

    function findNextBtn() {
        let btn = findNextInDoc(document);
        if (btn) return btn;
        for (const f of document.querySelectorAll("iframe")) {
            try {
                btn = findNextInDoc(f.contentDocument);
                if (btn) return btn;
            } catch (e) { }
        }
        return null;
    }

    function goNext() {
        setTimeout(() => {
            const btn = findNextBtn();
            if (btn) {
                log("➡️ 自动点击下一页", "info");
                btn.click();
            } else {
                log("⚠️ 未找到下一页按钮：可能是最后一页", "warn");
            }
        }, CONFIG.delay);
    }

    async function startAll() {
        if (location.href.includes("/course/view.php")) {
            log("当前是课程首页：请点蓝色按钮用 API 批量完成，无需挂机", "info");
            return;
        }
        log("===== 课页挂机任务开始 =====");
        const hasVideo = await playVideo();
        if (hasVideo) return;
        await autoScroll();
        goNext();
    }

    // ---------- 入口 ----------
    window.addEventListener("load", () => {
        const isCourseHome = location.href.includes("/course/view.php");
        createPanel(isCourseHome);
        setTimeout(() => {
            if (!isCourseHome && document.getElementById("autoStart").checked) {
                log("🔄 页面加载完成，自动执行挂机任务", "success");
                startAll();
            } else if (isCourseHome) {
                log("🔄 课程首页就绪，点击蓝色按钮一键 API 完成", "success");
            }
        }, 1200);
    });

})();