// ==UserScript==
// @name         蕴瑜课堂自动播放 - 通用版
// @namespace    http://tampermonkey.net/
// @version      7.0
// @description  自动完成视频，支持课程索引中的任意 fsresource
// @match        https://courses.gdut.edu.cn/course/view.php?id=*
// @match        https://courses.gdut.edu.cn/mod/fsresource/view.php?id=*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    const TARGET = 90;
    const CHECK_INTERVAL = 3000;
    const LONG_PRESS_MS = 6500;
    const MAX_EMPTY = 3;
    const STUCK_CHECK_INTERVAL = 60000;

    let isNavigating = false;
    let emptyCount = 0;
    let isLongPressing = false;
    let playRetry = 0;

    let lastProgress = -1;
    let lastWatchTime = -1;
    let stuckTimer = null;

    function log(msg) {
        console.log(`[自动] ${new Date().toLocaleTimeString()} ${msg}`);
    }

    // 获取课程索引中的所有 fsresource（不限制名称，但会排除明显的非视频如 .pdf, .docx）
    function getVideoList() {
        const container = document.querySelector('#courseindex, .courseindex');
        if (!container) return null;
        const items = container.querySelectorAll('li.courseindex-item');
        const videos = [];
        for (let item of items) {
            const link = item.querySelector('a.courseindex-link');
            if (!link) continue;
            const href = link.href;
            if (!href || !href.includes('/mod/fsresource/view.php')) continue;
            const name = link.innerText || '';
            // 过滤掉明显的文档（.pdf, .docx, .ppt）和测试（包含“测试”二字）
            if (name.includes('.pdf') || name.includes('.docx') || name.includes('.ppt') || name.includes('测试')) {
                continue;
            }
            const compSpan = item.querySelector('.completioninfo');
            let completed = false;
            if (compSpan) {
                if (compSpan.classList.contains('completion_complete') ||
                    compSpan.getAttribute('data-value') === '1') {
                    completed = true;
                }
            }
            const idMatch = href.match(/id=(\d+)/);
            if (idMatch) {
                videos.push({
                    id: parseInt(idMatch[1]),
                    url: href,
                    name: name,
                    completed: completed
                });
            }
        }
        return videos.length ? videos : null;
    }

    function getCurrentId() {
        const m = location.search.match(/[?&]id=(\d+)/);
        return m ? parseInt(m[1]) : 0;
    }

    // 获取课程ID（从URL或面包屑）
    function getCourseId() {
        let m = location.pathname.match(/\/course\/view\.php\?id=(\d+)/);
        if (m) return m[1];
        const breadcrumb = document.querySelector('.breadcrumb a[href*="/course/view.php"]');
        if (breadcrumb) {
            let mm = breadcrumb.href.match(/id=(\d+)/);
            if (mm) return mm[1];
        }
        return null;
    }

    // 跳转到课程主页
    function backToCourse() {
        let cid = getCourseId();
        if (cid) {
            location.href = `/course/view.php?id=${cid}`;
        } else {
            alert('无法返回课程主页，请手动进入');
        }
    }

    function goToNext() {
        if (isNavigating) return;
        isNavigating = true;

        let videos = getVideoList();
        if (!videos) {
            log('索引未加载，稍后重试');
            setTimeout(() => {
                isNavigating = false;
                goToNext();
            }, 1000);
            return;
        }

        const curId = getCurrentId();
        let curIdx = videos.findIndex(v => v.id === curId);
        if (curIdx === -1) curIdx = 0;

        let nextIdx = -1;
        for (let i = curIdx + 1; i < videos.length; i++) {
            if (!videos[i].completed) { nextIdx = i; break; }
        }
        if (nextIdx === -1) {
            for (let i = 0; i < curIdx; i++) {
                if (!videos[i].completed) { nextIdx = i; break; }
            }
        }

        if (nextIdx === -1) {
            log('🎉 所有视频已完成！');
            stopStuckDetection();
            isNavigating = false;
            return;
        }

        const next = videos[nextIdx];
        log(`跳转: ${next.name} (ID=${next.id})`);
        stopStuckDetection();
        location.href = next.url;
        setTimeout(() => { isNavigating = false; }, 3000);
    }

    function isNonVideo() {
        const title = document.querySelector('.page-header-headings h1, .activity-title');
        if (title) {
            const txt = title.innerText;
            if (txt.includes('PDF') || txt.includes('文档') || txt.includes('测试')) return true;
        }
        return false;
    }

    function simulateLongPress() {
        if (isLongPressing) return;
        const btns = document.querySelectorAll('button, .btn');
        for (let btn of btns) {
            if (!btn.offsetParent) continue;
            const text = btn.innerText || btn.textContent;
            if (text.includes('按住') || text.includes('长按')) {
                log(`长按: ${btn.id || '无id'}`);
                isLongPressing = true;
                const rect = btn.getBoundingClientRect();
                const x = rect.left + rect.width / 2;
                const y = rect.top + rect.height / 2;
                const opts = { bubbles: true, cancelable: true, view: window, clientX: x, clientY: y, buttons: 1 };
                btn.dispatchEvent(new PointerEvent('pointerdown', opts));
                btn.dispatchEvent(new MouseEvent('mousedown', opts));
                btn.dispatchEvent(new TouchEvent('touchstart', {
                    bubbles: true,
                    touches: [new Touch({ identifier: Date.now(), target: btn, clientX: x, clientY: y })]
                }));
                setTimeout(() => {
                    btn.dispatchEvent(new PointerEvent('pointerup', opts));
                    btn.dispatchEvent(new MouseEvent('mouseup', opts));
                    btn.dispatchEvent(new TouchEvent('touchend', opts));
                    btn.dispatchEvent(new MouseEvent('click', opts));
                    isLongPressing = false;
                }, LONG_PRESS_MS);
                break;
            }
        }
    }

    function dismissPopups() {
        const keywords = ['确定', '确认', '继续', '我知道了', '关闭'];
        document.querySelectorAll('button, .btn').forEach(btn => {
            if (!btn.offsetParent) return;
            const text = btn.innerText || btn.textContent;
            if (keywords.some(kw => text.includes(kw))) {
                btn.click();
                log(`弹窗: ${text}`);
            }
        });
    }

    async function ensurePlay(video) {
        if (!video) return false;
        if (!video.paused) return true;
        video.muted = true;
        video.dispatchEvent(new MouseEvent('click', { bubbles: true }));
        simulateLongPress();
        try {
            await video.play();
            playRetry = 0;
            log('视频开始播放');
            return true;
        } catch (err) {
            log(`播放失败: ${err.message}`);
            if (playRetry++ < 3) {
                setTimeout(() => ensurePlay(video), 1500);
            }
            return false;
        }
    }

    function getProgressAndCompletion() {
        const completedSpan = document.querySelector('.tips-completion');
        if (completedSpan && completedSpan.innerText.includes('已完成')) {
            return { progress: 100, completed: true };
        }
        const progressSpan = document.querySelector('.num-bfjd span');
        if (progressSpan) {
            let val = parseFloat(progressSpan.innerText);
            if (!isNaN(val)) return { progress: val, completed: val >= TARGET };
        }
        const video = document.querySelector('video');
        if (video && video.duration && video.duration !== Infinity) {
            let val = (video.currentTime / video.duration) * 100;
            return { progress: val, completed: val >= TARGET };
        }
        return { progress: 0, completed: false };
    }

    function getProgressAndWatchTime() {
        let progress = -1, watchTime = -1;
        const progSpan = document.querySelector('.num-bfjd span');
        if (progSpan) {
            let val = parseFloat(progSpan.innerText);
            if (!isNaN(val)) progress = val;
        }
        const timeSpan = document.querySelector('.num-gksc span');
        if (timeSpan) {
            let val = parseInt(timeSpan.innerText, 10);
            if (!isNaN(val)) watchTime = val;
        }
        return { progress, watchTime };
    }

    function checkStuck() {
        if (isNavigating) return;
        const { progress, watchTime } = getProgressAndWatchTime();
        if (progress === -1 || watchTime === -1) return;
        if (lastProgress !== -1 && lastWatchTime !== -1) {
            if (progress === lastProgress && watchTime === lastWatchTime) {
                log(`检测到卡死（进度=${progress}%，时长=${watchTime}秒），刷新页面`);
                location.reload();
                return;
            }
        }
        lastProgress = progress;
        lastWatchTime = watchTime;
        log(`卡死检测：进度=${progress}%，时长=${watchTime}秒`);
    }

    function startStuckDetection() {
        if (stuckTimer) clearInterval(stuckTimer);
        lastProgress = -1;
        lastWatchTime = -1;
        stuckTimer = setInterval(() => {
            if (location.pathname.includes('/mod/fsresource/view.php')) {
                checkStuck();
            }
        }, STUCK_CHECK_INTERVAL);
    }

    function stopStuckDetection() {
        if (stuckTimer) { clearInterval(stuckTimer); stuckTimer = null; }
    }

    async function handleVideoPage() {
        dismissPopups();
        simulateLongPress();

        if (isNonVideo()) {
            log('非视频内容，跳过');
            goToNext();
            return;
        }

        const video = document.querySelector('video');
        if (!video) {
            emptyCount++;
            if (emptyCount >= MAX_EMPTY) {
                log(`连续 ${MAX_EMPTY} 次无视频，可能页面错误，返回课程主页`);
                emptyCount = 0;
                backToCourse();
            }
            return;
        }
        emptyCount = 0;

        await ensurePlay(video);

        const { progress, completed } = getProgressAndCompletion();
        log(`进度: ${progress.toFixed(1)}%, 已完成: ${completed}`);
        if (completed || progress >= TARGET) {
            log('达到目标，跳转下一个');
            goToNext();
        }
    }

    function handleCoursePage() {
        let videos = getVideoList();
        if (!videos) {
            log('课程索引尚未加载，等待1秒后重试');
            setTimeout(handleCoursePage, 1000);
            return;
        }
        const firstUnfinished = videos.find(v => !v.completed);
        if (firstUnfinished) {
            log(`开始第一个未完成视频: ${firstUnfinished.name}`);
            location.href = firstUnfinished.url;
        } else {
            log('所有视频已完成！');
        }
    }

    // 入口
    if (location.pathname.includes('/course/view.php')) {
        setTimeout(handleCoursePage, 2000);
    } else if (location.pathname.includes('/mod/fsresource/view.php')) {
        startStuckDetection();
        let waitTimes = 0;
        function waitForIndexAndStart() {
            if (getVideoList()) {
                handleVideoPage();
            } else if (waitTimes++ < 6) {
                setTimeout(waitForIndexAndStart, 500);
            } else {
                log('索引加载超时，但仍尝试执行视频逻辑（可能页面无左侧索引）');
                handleVideoPage();
            }
        }
        waitForIndexAndStart();
    }

    setInterval(() => {
        if (location.pathname.includes('/mod/fsresource/view.php')) {
            dismissPopups();
            simulateLongPress();
            const { progress, completed } = getProgressAndCompletion();
            if (completed || progress >= TARGET) {
                log('定时检测达标，立即跳转');
                goToNext();
            }
        }
    }, CHECK_INTERVAL);
})();