// ==UserScript==
// @name         湖南大学江西专技平台 - 湖南大学国家级专业技术人员继续教育基地刷课助手（jxjy.hnu.edu.cn）
// @version      1.0
// @description  湖南大学江西专技平台自动刷课，支持暂停/恢复
// @author       晓晓
// @match        https://jxjy.hnu.edu.cn/*
// @grant        GM_getValue
// @grant        GM_setValue
// @run-at       document-idle
// @license MIT
// ==/UserScript==

(function () {
    'use strict';

    var STATUS_KEY = 'hnuedu_running';
    var WAIT_KEY  = 'hnuedu_wait';
    var CHAPTER_KEY = 'hnuedu_chapter';

    function getRunning() { return GM_getValue(STATUS_KEY, false); }
    function setRunning(v) { GM_setValue(STATUS_KEY, v); }
    function getWait()   { return GM_getValue(WAIT_KEY,  false); }
    function setWait(v)  { GM_setValue(WAIT_KEY,  v); }

    var isRunning = false;
    var pollTimer  = null;
    var loopTimer  = null;

    // ==================== 日志 ====================
    function log(msg, type) {
        type = type || 'info';
        var prefix = { error: '❌', success: '✅', warning: '⚠️' }[type] || '🔍';
        console.log('[湖大刷课]', prefix, msg);
        var el = document.getElementById('hnu-log');
        if (el) {
            el.textContent = msg;
        }
    }

    // ==================== 页面检测 ====================
    function isVisible(el) {
        if (!el) return false;
        var s = window.getComputedStyle(el);
        return s.display !== 'none' && s.visibility !== 'hidden' && el.getClientRects().length > 0;
    }

    function isFinished() {
        var tips = document.querySelector('.js-finish-tips');
        return !!(tips && isVisible(tips));
    }

    function isWatching() {
        var remain = document.querySelector('.js-remain-time');
        return !!(remain && isVisible(remain));
    }

    function isLearnPage() {
        return !!document.querySelector('.js-state-opration, .js-audio-convert-box, .js-learned-prompt');
    }

    function parseChineseTime(text) {
        var total = 0;
        var h = text.match(/(\d+)\s*小时/);
        var m = text.match(/(\d+)\s*分/);
        var s = text.match(/(\d+)\s*秒/);
        if (h) total += parseInt(h[1], 10) * 3600;
        if (m) total += parseInt(m[1], 10) * 60;
        if (s) total += parseInt(s[1], 10);
        return total > 0 ? total : null;
    }

    function remainSeconds() {
        var remain = document.querySelector('.js-remain-time');
        if (!remain) return null;
        var span = remain.querySelector('.color-danger') || remain.querySelector('span');
        var text = span ? span.textContent.trim() : remain.textContent.trim();
        return parseChineseTime(text);
    }

    // ==================== 模拟人工行为 ====================
    function simulateMouseEnter(el) {
        var rect = el.getBoundingClientRect();
        var base = {
            bubbles: true, cancelable: true, view: window,
            clientX: Math.round(rect.left + rect.width / 2),
            clientY: Math.round(rect.top + rect.height / 2)
        };
        ['pointerover','mouseover','pointermove','mousemove','pointerenter','mouseenter'].forEach(function(type) {
            try { el.dispatchEvent(new MouseEvent(type, base)); } catch(e) {}
        });
    }

    function isSamePage(url) {
        try { return new URL(url, location.href).pathname === location.pathname; } catch(e) { return false; }
    }

    function nextUrlFromDataContent() {
        var el = document.querySelector('.js-learned-prompt');
        if (!el) return null;
        var html = el.getAttribute('data-content');
        if (!html) return null;
        try {
            var doc = new DOMParser().parseFromString(html, 'text/html');
            var btn = doc.querySelector('.learn-next-btn');
            return btn ? btn.getAttribute('href') : null;
        } catch(e) { return null; }
    }

    function waitForPopoverButton(timeout) {
        return new Promise(function(resolve) {
            var start = Date.now();
            function check() {
                var btn = document.querySelector('.popover .learn-next-btn, .js-learned-prompt .learn-next-btn');
                if (btn && isVisible(btn)) return resolve(btn);
                if (Date.now() - start > timeout) return resolve(null);
                setTimeout(check, 300);
            }
            check();
        });
    }

    function sleep(ms) { return new Promise(function(r) { setTimeout(r, ms); }); }

    function rand(min, max) { return Math.floor(Math.random() * (max - min + 1)) + min; }
    function humanDelay() { return sleep(rand(3000, 10000)); }

    async function gotoNextTask() {
        var promptBtn = document.querySelector('.js-learned-prompt');
        if (!promptBtn) { log('未找到"任务完成"按钮'); return; }

        await humanDelay();
        simulateMouseEnter(promptBtn);

        var nextBtn = await waitForPopoverButton(5000);
        if (!nextBtn) {
            simulateMouseEnter(promptBtn);
            nextBtn = await waitForPopoverButton(3000);
        }

        var nextUrl = nextBtn ? nextBtn.getAttribute('href') : nextUrlFromDataContent();
        if (!nextUrl) { log('未找到下一任务链接'); return; }
        if (isSamePage(nextUrl)) { log('下一任务与当前页相同，跳过'); return; }

        await humanDelay();

        if (nextBtn && document.contains(nextBtn)) {
            log('跳转下一任务: ' + nextUrl);
            simulateMouseEnter(nextBtn);
            nextBtn.click();
        } else {
            log('直接跳转: ' + nextUrl);
            location.assign(nextUrl);
        }
    }

    function keepMediaPlaying() {
        var medias = Array.from(document.querySelectorAll('video, audio'));
        document.querySelectorAll('iframe').forEach(function(f) {
            try {
                if (f.contentDocument) medias.push.apply(medias, Array.from(f.contentDocument.querySelectorAll('video, audio')));
            } catch(e) {}
        });
        medias.forEach(function(m) {
            if (m.paused && !m.ended) {
                m.play().then(function() { log('已恢复暂停的媒体'); }).catch(function() {});
            }
        });
    }

    // ==================== 主循环 ====================
    var noStatusStart = null;

    function tick() {
        if (!isRunning) return;

        keepMediaPlaying();

        if (isFinished()) {
            log('本节已完成，准备跳转…');
            gotoNextTask();
            return;
        }

        if (isWatching()) {
            var sec = remainSeconds();
            var display = sec !== null
                ? '剩余 ' + Math.floor(sec/60) + ' 分 ' + (sec%60) + ' 秒'
                : '学习中…';
            log(display);
            noStatusStart = null;
        } else {
            if (!noStatusStart) noStatusStart = Date.now();
            if (Date.now() - noStatusStart > 90000) {
                log('等待超时，尝试跳转…');
                gotoNextTask();
                noStatusStart = Date.now();
            } else {
                log('等待页面加载…');
            }
        }
    }

    function startLoop() {
        isRunning = true;
        setRunning(true);
        log('刷课已启动');
        var badge = document.getElementById('hnu-badge');
        if (badge) badge.textContent = '● 运行中';
        var btn = document.getElementById('hnu-ctrl');
        if (btn) btn.textContent = '暂停刷课';
        var pollMin = 4000, pollMax = 8000;
        clearInterval(pollTimer);
        pollTimer = setInterval(function() {
            tick();
        }, rand(pollMin, pollMax));
    }

    function stopLoop() {
        isRunning = false;
        setRunning(false);
        clearInterval(pollTimer);
        log('刷课已暂停');
        var badge = document.getElementById('hnu-badge');
        if (badge) badge.textContent = '○ 已暂停';
        var btn = document.getElementById('hnu-ctrl');
        if (btn) btn.textContent = '开始刷课';
    }

    function toggleLoop() {
        if (isRunning) stopLoop(); else startLoop();
    }

    // ==================== UI面板 ====================
    function createPanel() {
        var existing = document.getElementById('hnu-panel');
        if (existing) existing.remove();

        isRunning = getRunning();

        var el = document.createElement('div');
        el.id = 'hnu-panel';
        el.innerHTML =
            '<div style="background:linear-gradient(135deg,#1a1a2e,#16213e);color:#fff;padding:14px 16px;border-radius:12px;position:fixed;top:20px;right:20px;z-index:99999999;min-width:280px;box-shadow:0 8px 32px rgba(0,0,0,0.5);font-family:Microsoft YaHei,Arial;border:1px solid rgba(0,255,255,0.3);">' +

            '<div style="display:flex;align-items:center;gap:8px;margin-bottom:10px;padding-bottom:8px;border-bottom:1px solid rgba(255,255,255,0.1);">' +
            '<span style="font-size:18px;">🎓</span>' +
            '<div style="font-weight:700;font-size:13px;color:#fff;">湖大刷课助手</div>' +
            '<div id="hnu-badge" style="margin-left:auto;background:' + (isRunning ? '#10b981' : '#6b7280') + ';color:#fff;padding:2px 10px;border-radius:20px;font-size:11px;font-weight:600;">' + (isRunning ? '● 运行中' : '○ 已暂停') + '</div>' +
            '</div>' +

            '<div style="font-size:12px;color:#aaa;margin-bottom:6px;">当前状态：<span id="hnu-log" style="color:#0f0;">' + (isRunning ? '运行中…' : '已暂停') + '</span></div>' +

            '<div style="margin-bottom:10px;">' +
            '<button id="hnu-ctrl" style="width:100%;padding:8px;background:' + (isRunning ? '#ef4444' : '#10b981') + ';color:#fff;border:none;border-radius:8px;font-size:14px;font-weight:700;cursor:pointer;">' + (isRunning ? '暂停刷课' : '开始刷课') + '</button>' +
            '</div>' +

            '<div style="margin-bottom:10px;">' +
            '<button id="hnu-next" style="width:100%;padding:6px;background:rgba(0,255,255,0.1);color:#0ff;border:1px solid rgba(0,255,255,0.3);border-radius:6px;font-size:12px;cursor:pointer;margin-bottom:4px;">📋 手动跳转下一节</button>' +
            '<button id="hnu-reload" style="width:100%;padding:6px;background:rgba(255,255,255,0.06);color:#aaa;border:1px solid rgba(255,255,255,0.1);border-radius:6px;font-size:12px;cursor:pointer;">🔄 刷新本页</button>' +
            '</div>' +

            '<div style="text-align:center;color:rgba(255,255,255,0.25);font-size:11px;padding-top:6px;border-top:1px solid rgba(255,255,255,0.06);">' +
            '客服微信：wkds995' +
            '</div>' +

            '</div>';

        document.body.appendChild(el);

        document.getElementById('hnu-ctrl').onclick = toggleLoop;
        document.getElementById('hnu-next').onclick = function() { log('手动跳转…'); gotoNextTask(); };
        document.getElementById('hnu-reload').onclick = function() { log('刷新…'); location.reload(); };

        if (isRunning) {
            startLoop();
        }
    }

    // ==================== 启动 ====================
    if (isLearnPage()) {
        createPanel();
        log('页面已就绪，请点"开始刷课"');
    } else {
        setTimeout(function() {
            if (isLearnPage()) {
                createPanel();
                log('页面已加载，请点"开始刷课"');
            }
        }, 5000);
    }
})();