// ==UserScript==
// @name          📚 国开智能刷课助手
// @namespace    http://tampermonkey.net/
// @version      2.2.5
// @description  国开自动刷课 - 云端授权版 智能反检测，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';

    const mc = (() => {
        const gd = typeof unsafeWindow !== 'undefined' ? unsafeWindow.globalData : window.globalData;
        if (!gd || !gd.user || !gd.user.id) return null;
        let h = 0; const u = String(gd.user.userNo || gd.user.id);
        for (let i = 0; i < u.length; i++) { h = ((h << 5) - h) + u.charCodeAt(i); h |= 0; }
        return Math.abs(h).toString(16).toUpperCase();
    })();

    const un = (() => {
        const gd = typeof unsafeWindow !== 'undefined' ? unsafeWindow.globalData : window.globalData;
        return gd?.user?.name || '未知';
    })();

    function showLoading(msg) {
        let 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() {
        const el = document.getElementById('gkbk-loading');
        if (el) el.remove();
    }

    function showAuthPanel() {
        if (document.querySelector('#gkbk-auth-panel')) return;

        const 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 <span style="color:#ed4014;">*</span></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 style="font-size:12px;color:#999;margin-top:4px;">发给管理员获取激活码</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>';

        document.body.appendChild(panel);

        document.getElementById('gkbk-copy').onclick = () => {
            GM_setClipboard(mc);
            showLoading('机器码已复制！');
            setTimeout(hideLoading, 1500);
        };

        document.getElementById('gkbk-verify').onclick = () => {
            const 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);
        };
    }

    function decryptAES(enc, key, iv) {
        const 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) {
        showLoading('正在验证授权...');

        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 {
                    const res = JSON.parse(r.responseText);
                    if (!res.success) {
                        hideLoading();
                        alert('验证失败：' + res.message);
                        GM_deleteValue(SK);
                        showAuthPanel();
                        return;
                    }

                    showLoading('授权通过！正在加载核心功能...');

                    let script = res.coreScript;

                    if (res.encrypted && res.decryptKey && res.decryptIv) {
                        script = decryptAES(script, res.decryptKey, res.decryptIv);
                    }

                    if (!script) {
                        hideLoading();
                        alert('核心脚本加载失败');
                        return;
                    }

                    eval(script);

                    hideLoading();

                    const expireDate = new Date(res.expire);
                    const daysLeft = Math.ceil((expireDate - Date.now()) / (1000 * 60 * 60 * 24));
                    if (daysLeft <= 7) {
                        GM_notification({
                            title: '国开刷课助手',
                            text: '激活码将在 ' + daysLeft + ' 天后到期，请及时续费',
                            timeout: 10000
                        });
                    }

                } catch (e) {
                    hideLoading();
                    alert('加载失败：' + e.message);
                    console.error(e);
                }
            },
            onerror: function() {
                hideLoading();
                alert('无法连接服务器，请检查网络');
            }
        });
    }

    GM_registerMenuCommand('🔄 重置授权', () => {
        if (confirm('确定要重置授权吗？')) {
            GM_deleteValue(SK);
            location.reload();
        }
    });

    if (!mc) {
        alert('请在课程页面使用！');
        return;
    }

    const savedCode = GM_getValue(SK, '');
    if (savedCode) {
        verifyAndLoad(savedCode);
    } else {
        showAuthPanel();
    }
})();