// ==UserScript==
// @name         南阳理工学院专业技术人员继续教育学习平台自动挂课助手
// @namespace    com.qq.zhijianyuan
// @version      1.0.0
// @description  自动拦截 15 分钟暂停、静音播放、自动跳章节、自动换课（仅视频，不含考试）
// @author       吾爱汝至
// @match        https://nykj.jxjyedu.org.cn/*
// @grant        unsafeWindow
// @run-at       document-start
// @license      MIT
// ==/UserScript==

(function () {
    'use strict';

    console.log('[全自动脚本] 注入 ' + location.pathname);
    const pageWin = typeof unsafeWindow !== 'undefined' ? unsafeWindow : window;

    // ================= 通用拦截 =================
    const origSetTimeout = pageWin.setTimeout;
    pageWin.setTimeout = function (fn, delay, ...args) {
        if (typeof delay === 'number' && delay >= 600000 && delay <= 1800000) {
            console.log('[拦截长定时器] delay =', delay);
            return -1;
        }
        return origSetTimeout.call(this, fn, delay, ...args);
    };

    try {
        pageWin.HTMLMediaElement.prototype.pause = function () {
            console.log('[拦截 pause]');
        };
    } catch (e) {}

    pageWin.alert = function (msg) {
        console.log('[静默 alert]', msg);
    };

    // ================= 黑名单工具 =================
    function getBlacklist() {
        try {
            return JSON.parse(sessionStorage.getItem('autoStudy_blacklist') || '[]');
        } catch (e) { return []; }
    }
    function addToBlacklist(courseId) {
        if (!courseId) return;
        var list = getBlacklist();
        if (list.indexOf(String(courseId)) < 0) {
            list.push(String(courseId));
            sessionStorage.setItem('autoStudy_blacklist', JSON.stringify(list));
            console.log('[黑名单] 已加入 ' + courseId + '，当前黑名单：' + list.join(','));
        }
    }
    function isBlacklisted(courseId) {
        return getBlacklist().indexOf(String(courseId)) >= 0;
    }

    // ================= 分页初始化 =================
    function main() {
        var path = location.pathname;
        if (path.indexOf('/study.html') >= 0) initStudyPage();
        else if (path.indexOf('/course_chapter.html') >= 0) initChapterPage();
        else if (path.indexOf('/mycourse.html') >= 0 || path.indexOf('/person_center.html') >= 0) initMyCoursePage();
    }

    // A. 视频播放页
    function initStudyPage() {
        console.log('[视频页] 启动');

        setInterval(function () {
            var v = document.querySelector('video');
            if (!v) return;
            if (v.paused && !v.ended) {
                v.muted = true;
                v.play().catch(function () {});
            }
        }, 1000);

        var attachInterval = setInterval(function () {
            var v = document.querySelector('video');
            if (!v) return;
            clearInterval(attachInterval);
            console.log('[视频页] 绑定 ended');

            v.addEventListener('ended', function () {
                console.log('[视频页] 播放完毕');
                setTimeout(function () {
                    // 优先用视频页 URL 的 id（真正 courseId）
                    var urlIdM = /[?&]id=(\d+)/.exec(location.search);
                    var urlCourseId = urlIdM ? urlIdM[1] : null;

                    // 兜底用 sessionStorage
                    var ssCourseId = sessionStorage.getItem('autoStudy_courseId');

                    // URL 里的 id 最可信，优先
                    var courseId = urlCourseId || ssCourseId;

                    if (!courseId) {
                        console.log('[视频页] 无法确定 courseId，返回首页兜底');
                        location.href = 'person_center.html';
                        return;
                    }

                    if (isBlacklisted(courseId)) {
                        console.log('[视频页] ' + courseId + ' 在黑名单中，返回首页');
                        location.href = 'person_center.html';
                        return;
                    }

                    var m = /[?&]chapter=(\d+)/.exec(location.search);
                    var currentChap = m ? parseInt(m[1]) : 0;
                    var nextEl = document.getElementById('chapter' + (currentChap + 1));

                    if (!nextEl) {
                        console.log('[视频页] 无下一章，返回章节列表 id=' + courseId);
                        location.href = 'course_chapter.html?id=' + courseId;
                    } else {
                        console.log('[视频页] 有下一章，等待网站自动跳转');
                    }
                }, 2500);
            });
        }, 500);
    }

    // B. 章节列表页
    function initChapterPage() {
        console.log('[章节页] 启动');

        var idM = /[?&]id=(\d+)/.exec(location.search);
        var currentId = idM ? idM[1] : null;

        if (currentId) {
            // 不覆盖 sessionStorage 里的 courseId，只在没有时写入
            if (!sessionStorage.getItem('autoStudy_courseId')) {
                sessionStorage.setItem('autoStudy_courseId', currentId);
            }
            console.log('[章节页] 当前 courseId =', currentId);
        }

        // ★ 404 检测：3 秒内表格没出现，说明页面 404 或数据异常
        var pageStartAt = Date.now();
        var check404 = setInterval(function () {
            // 页面里已经出现 table.status，正常
            if (document.querySelector('table.status')) {
                clearInterval(check404);
                return;
            }
            // 检测页面文案
            var bodyText = document.body ? document.body.innerText : '';
            var is404 = bodyText.indexOf('页面不存在') >= 0 ||
                        bodyText.indexOf('访问的页面') >= 0;

            if (is404 || Date.now() - pageStartAt > 5000) {
                clearInterval(check404);
                console.log('[章节页] 检测到 404 或页面异常，id=' + currentId);

                if (currentId) {
                    addToBlacklist(currentId);
                }
                // 清掉可能错误的 sessionStorage
                sessionStorage.removeItem('autoStudy_courseId');

                setTimeout(function () {
                    console.log('[章节页] 返回首页');
                    location.href = 'person_center.html';
                }, 1500);
            }
        }, 500);

        // 正常流程
        var waitInterval = setInterval(function () {
            var rows = document.querySelectorAll('table.status tbody tr');
            if (rows.length === 0) return;

            var videoRows = [];
            for (var i = 0; i < rows.length; i++) {
                var nameCell = rows[i].querySelector('td:nth-child(2)');
                if (!nameCell) continue;
                if (nameCell.innerText.indexOf('课程测试') >= 0) continue;
                videoRows.push(rows[i]);
            }
            if (videoRows.length === 0) return;

            clearInterval(waitInterval);
            clearInterval(check404);

            var targetBtn = null;
            var targetName = '';
            for (var j = 0; j < videoRows.length; j++) {
                var stCell = videoRows[j].querySelector('td:nth-child(4)');
                if (!stCell) continue;
                var st = stCell.innerText;
                if (st.indexOf('未学习') >= 0 || st.indexOf('学习中') >= 0) {
                    targetBtn = videoRows[j].querySelector('.study-btn');
                    targetName = videoRows[j].querySelector('td:nth-child(2)').innerText;
                    break;
                }
            }

            if (targetBtn) {
                console.log('[章节页] 自动进入：' + targetName);
                setTimeout(function () { targetBtn.click(); }, 600);
            } else {
                console.log('[章节页] 本门课视频已全部完成，返回首页');
                setTimeout(function () { location.href = 'person_center.html'; }, 1500);
            }
        }, 800);
    }

    // C. 首页
    function initMyCoursePage() {
        console.log('[首页] 启动');

        var startTime = Date.now();
        var waitInterval = setInterval(function () {
            var container = document.querySelector('#zyk') || document.body;

            var allCourses = container.querySelectorAll('.course li');
            if (allCourses.length === 0) {
                if (Date.now() - startTime > 10000) {
                    console.log('[首页] 10 秒内未检测到课程列表，放弃');
                    clearInterval(waitInterval);
                }
                return;
            }

            clearInterval(waitInterval);

            var startBtns = container.querySelectorAll('.start');
            if (startBtns.length === 0) {
                console.log('[首页] 没有未完成的课程');
                return;
            }

            console.log('[首页] 共有 ' + startBtns.length + ' 门未完成课程，开始逐个筛选...');

            var validBtn = null;
            var validInfo = '';
            var skippedList = [];

            for (var k = 0; k < startBtns.length; k++) {
                var btn = startBtns[k];
                var li = btn.closest('li');
                if (!li) continue;

                var courseId = btn.getAttribute('course');

                // ★ 黑名单过滤
                if (isBlacklisted(courseId)) {
                    skippedList.push(courseId + '(黑名单)');
                    continue;
                }

                var timerEl = li.querySelector('.timer span');
                var txt = timerEl ? timerEl.innerText : '';

                var mm = /已完成\s*(\d+)\/(\d+)\s*章/.exec(txt);
                if (mm) {
                    var done = parseInt(mm[1]);
                    var total = parseInt(mm[2]);
                    if (done < total) {
                        validBtn = btn;
                        validInfo = 'courseId=' + courseId + ' 进度 ' + done + '/' + total;
                        break;
                    } else {
                        skippedList.push(courseId + '(' + done + '/' + total + ' 视频已完成，需考试)');
                    }
                } else {
                    skippedList.push(courseId + '(无法解析进度)');
                }
            }

            if (skippedList.length > 0) {
                console.log('[首页] 跳过 ' + skippedList.length + ' 门课程：');
                skippedList.forEach(function (s) { console.log('  - ' + s); });
            }

            if (validBtn) {
                console.log('[首页] 进入：' + validInfo);
                // 记录正确的 courseId 到 sessionStorage
                var realId = validBtn.getAttribute('course');
                sessionStorage.setItem('autoStudy_courseId', realId);
                setTimeout(function () { validBtn.click(); }, 800);
            } else {
                console.log('[首页] 所有未完成课程的视频都已完成，仅剩考试需要手动处理，脚本停止。');
            }
        }, 800);
    }

    // ================= 启动 =================
    if (document.readyState === 'loading') {
        window.addEventListener('DOMContentLoaded', main);
    } else {
        main();
    }
})();