// ==UserScript==
// @name          📚 国开智能刷课助手
// @namespace    http://tampermonkey.net/
// @version      2.3.0.1
// @description  国开自动刷课 - 云端授权版 本地智能恢复，q反馈群：612441267
// @author       lakay666
// @match        *://lms.ouchn.cn/course/*
// @match        *://lms.ouchn.cn/user/courses*
// @grant        GM_getValue
// @grant        GM_setValue
// @grant        GM_deleteValue
// @grant        GM_setClipboard
// @grant        GM_xmlhttpRequest
// @grant        GM_registerMenuCommand
// @grant        GM_notification
// @grant        unsafeWindow
// @require      https://cdnjs.cloudflare.com/ajax/libs/crypto-js/4.2.0/crypto-js.min.js
// @run-at       document-end
// ==/UserScript==
 
(function() {
    'use strict';
 
    const SERVER = 'http://150.158.119.55:3000';
    const SK = 'gkbk_activation_code';
 
    // ==================== 本地智能恢复 ====================
    var lastUrl = location.href;
    var lastProgress = 0;
    var lastChangeTime = Date.now();
    var recoveryTimer = null;
 
    function startLocalRecovery() {
        recoveryTimer = setInterval(function() {
            var now = Date.now();
            var currentUrl = location.href;
            var currentProgress = 0;
            try {
                var el = document.querySelector('.progress-text, [class*="progress"], .study-progress');
                if (el) { var m = el.textContent.match(/(\d+)%/); if (m) currentProgress = parseInt(m[1]); }
            } catch(e) {}
 
            // 检测：同URL超过15分钟没变化
            if (currentUrl === lastUrl && currentProgress === lastProgress) {
                var stuckMinutes = Math.floor((now - lastChangeTime) / 60000);
                if (stuckMinutes >= 15) {
                    console.warn('[国开助手] 检测到卡住 ' + stuckMinutes + ' 分钟，自动恢复');
                    if (currentUrl.includes('full-screen')) {
                        var backBtn = document.querySelector('a.full-screen-mode-back');
                        if (backBtn) backBtn.click(); else history.back();
                    } else {
                        location.reload();
                    }
                    lastChangeTime = now;
                }
            } else {
                lastUrl = currentUrl;
                lastProgress = currentProgress;
                lastChangeTime = now;
            }
        }, 60000);
    }
 
    // ==================== 等待 globalData ====================
    function waitForGlobalData(maxRetries, callback) {
        maxRetries = maxRetries || 20;
        var retries = 0;
        function tryGet() {
            retries++;
            var gd = (typeof unsafeWindow !== 'undefined' ? unsafeWindow.globalData : null) || window.globalData;
            if (gd && gd.user && gd.user.id) { callback(gd); return; }
            if (retries < maxRetries) { setTimeout(tryGet, 1000); }
            else { console.warn('[国开助手] 无法获取 globalData（已重试' + maxRetries + '次）'); }
        }
        tryGet();
    }
 
    function generateMachineCode(gd) {
        if (!gd || !gd.user || !gd.user.id) return null;
        var h = 0;
        var u = String(gd.user.userNo || gd.user.id);
        for (var i = 0; i < u.length; i++) { h = ((h << 5) - h) + u.charCodeAt(i); h |= 0; }
        return Math.abs(h).toString(16).toUpperCase();
    }
 
    var heartbeatTimer = null;
    function startHeartbeat(mc, un) {
        if (heartbeatTimer) return;
        reportStatus(mc, un);
        heartbeatTimer = setInterval(function() { reportStatus(mc, un); }, 60000);
    }
 
    function reportStatus(mc, un) {
        var courseId = '';
        try {
            var gd = window.globalData || (typeof unsafeWindow !== 'undefined' ? unsafeWindow.globalData : null);
            if (gd && gd.course && gd.course.id) courseId = String(gd.course.id);
        } catch(e) {}
        var progress = 0;
        try {
            var el = document.querySelector('.progress-text, [class*="progress"], .study-progress');
            if (el) { var m = el.textContent.match(/(\d+)%/); if (m) progress = parseInt(m[1]); }
        } catch(e) {}
        GM_xmlhttpRequest({
            method: 'POST',
            url: SERVER + '/api/client-status',
            headers: { 'Content-Type': 'application/json' },
            data: JSON.stringify({
                machineCode: mc, userName: un,
                status: { url: location.href, courseId: courseId, progress: progress, paused: (window.GKBK_PAUSED === true), timestamp: Date.now() }
            }),
            onload: function(r) {
                try {
                    var res = JSON.parse(r.responseText);
                    if (res.command === 'recover') {
                        console.warn('[国开助手] 服务器下发恢复指令: ' + res.action);
                        if (res.action === 'return_course') {
                            var backBtn = document.querySelector('a.full-screen-mode-back');
                            if (backBtn) backBtn.click(); else history.back();
                        } else {
                            location.reload();
                        }
                    }
                } catch(e) {}
            }
        });
    }
 
    function showLoading(msg) {
        var el = document.getElementById('gkbk-loading');
        if (!el) {
            el = document.createElement('div');
            el.id = 'gkbk-loading';
            el.style.cssText = 'position:fixed;top:20px;right:20px;padding:12px 20px;background:#2d8cf0;color:#fff;border-radius:8px;z-index:2147483647;font-size:14px;box-shadow:0 4px 12px rgba(0,0,0,0.15);';
            document.body.appendChild(el);
        }
        el.textContent = '📚 ' + msg;
    }
 
    function hideLoading() { var el = document.getElementById('gkbk-loading'); if (el) el.remove(); }
 
    function showAuthPanel(mc, un) {
        if (document.querySelector('#gkbk-auth-panel')) return;
        var panel = document.createElement('div');
        panel.id = 'gkbk-auth-panel';
        panel.style.cssText = 'position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);width:360px;background:#fff;border-radius:16px;box-shadow:0 8px 32px rgba(0,0,0,0.2);z-index:2147483647;padding:24px;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;';
        panel.innerHTML =
            '<h3 style="margin:0 0 16px;color:#2d8cf0;">🔐 授权验证</h3>'+
            '<div style="margin-bottom:12px;"><label style="display:block;font-size:13px;color:#666;margin-bottom:4px;">账号</label><div style="padding:10px;background:#f5f5f5;border-radius:6px;font-size:14px;">'+un+'</div></div>'+
            '<div style="margin-bottom:12px;"><label style="display:block;font-size:13px;color:#666;margin-bottom:4px;">机器码</label>'+
            '<div style="display:flex;gap:8px;"><input id="gkbk-machine" value="'+mc+'" readonly style="flex:1;padding:10px;border:1px solid #ddd;border-radius:6px;background:#f5f5f5;font-size:13px;">'+
            '<button id="gkbk-copy" style="padding:10px 16px;background:#2d8cf0;color:#fff;border:none;border-radius:6px;cursor:pointer;">📋</button></div></div>'+
            '<div style="margin-bottom:16px;"><label style="display:block;font-size:13px;color:#666;margin-bottom:4px;">激活码</label>'+
            '<input id="gkbk-code" placeholder="粘贴激活码" style="width:100%;padding:10px;border:1px solid #ddd;border-radius:6px;font-size:14px;box-sizing:border-box;"></div>'+
            '<button id="gkbk-verify" style="width:100%;padding:12px;background:#19be6b;color:#fff;border:none;border-radius:8px;font-size:14px;font-weight:600;cursor:pointer;">✅ 验证并启动</button>'+
            '<div style="margin-top:12px;font-size:11px;color:#999;text-align:center;">🛰️ 本地智能恢复 | 15分钟无变化自动刷新</div>';
        document.body.appendChild(panel);
        document.getElementById('gkbk-copy').onclick = function() { GM_setClipboard(mc); showLoading('已复制'); setTimeout(hideLoading, 1500); };
        document.getElementById('gkbk-verify').onclick = function() {
            var code = document.getElementById('gkbk-code').value.trim();
            if (!code) { alert('请输入激活码'); return; }
            GM_setValue(SK, code); panel.remove(); verifyAndLoad(code, mc, un);
        };
    }
 
    function decryptAES(enc, key, iv) {
        var k = CryptoJS.enc.Utf8.parse(key), i = CryptoJS.enc.Utf8.parse(iv);
        return CryptoJS.AES.decrypt(enc, k, { iv: i, mode: CryptoJS.mode.CBC, padding: CryptoJS.pad.Pkcs7 }).toString(CryptoJS.enc.Utf8);
    }
 
    function verifyAndLoad(activationCode, mc, un) {
        showLoading('正在验证...');
        GM_xmlhttpRequest({
            method: 'POST', url: SERVER + '/api/verify',
            headers: { 'Content-Type': 'application/json' },
            data: JSON.stringify({ machineCode: mc, activationCode: activationCode, userName: un, encrypt: false }),
            onload: function(r) {
                try {
                    var res = JSON.parse(r.responseText);
                    if (!res.success) { hideLoading(); alert('验证失败：' + res.message); GM_deleteValue(SK); showAuthPanel(mc, un); return; }
                    showLoading('加载中...');
                    var script = res.coreScript;
                    if (res.encrypted && res.decryptKey && res.decryptIv) script = decryptAES(script, res.decryptKey, res.decryptIv);
                    if (!script) { hideLoading(); alert('加载失败'); return; }
                    window.GKBK_MACHINE_CODE = mc; window.GKBK_USER_NAME = un;
                    eval(script);
                    hideLoading();
                    startHeartbeat(mc, un);
                    startLocalRecovery();  // ← 启动本地智能恢复
                    var daysLeft = Math.ceil((new Date(res.expire) - Date.now()) / 86400000);
                    if (daysLeft <= 7) GM_notification({ title: '国开刷课助手', text: '激活码将在 ' + daysLeft + ' 天后到期', timeout: 10000 });
                } catch (e) { hideLoading(); alert('加载失败：' + e.message); }
            },
            onerror: function() { hideLoading(); alert('无法连接服务器'); }
        });
    }
 
    GM_registerMenuCommand('🔄 重置授权', function() { if (confirm('确定重置？')) { GM_deleteValue(SK); location.reload(); } });
 
    waitForGlobalData(20, function(gd) {
        var mc = generateMachineCode(gd), un = gd.user.name || '未知';
        if (!mc) return;
        window.GKBK_MACHINE_CODE = mc; window.GKBK_USER_NAME = un;
        var savedCode = GM_getValue(SK, '');
        if (savedCode) verifyAndLoad(savedCode, mc, un);
        else showAuthPanel(mc, un);
    });
})();