<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>用户注册 - 知识管理平台</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Microsoft YaHei', Arial, sans-serif;
            background: linear-gradient(135deg, #56CCF2 0%, #2F80ED 100%);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .register-container {
            background: white;
            border-radius: 10px;
            box-shadow: 0 10px 40px rgba(0,0,0,0.2);
            width: 400px;
            padding: 40px;
        }

        .register-header {
            text-align: center;
            margin-bottom: 30px;
        }

        .register-header h1 {
            font-size: 28px;
            color: #333;
            margin-bottom: 10px;
        }

        .register-header p {
            color: #666;
            font-size: 14px;
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-group label {
            display: block;
            margin-bottom: 8px;
            color: #333;
            font-weight: bold;
        }

        .form-group input {
            width: 100%;
            padding: 12px;
            border: 1px solid #ddd;
            border-radius: 5px;
            font-size: 14px;
            transition: border-color 0.3s;
        }

        .form-group input:focus {
            outline: none;
            border-color: #2F80ED;
        }

        .form-group small {
            color: #888;
            font-size: 12px;
            display: block;
            margin-top: 5px;
        }

        .btn-register {
            width: 100%;
            padding: 12px;
            background: linear-gradient(135deg, #56CCF2 0%, #2F80ED 100%);
            color: white;
            border: none;
            border-radius: 5px;
            font-size: 16px;
            font-weight: bold;
            cursor: pointer;
            transition: transform 0.2s;
        }

        .btn-register:hover {
            transform: translateY(-2px);
        }

        .btn-register:active {
            transform: translateY(0);
        }

        .login-link {
            text-align: center;
            margin-top: 20px;
            color: #666;
        }

        .login-link a {
            color: #2F80ED;
            text-decoration: none;
            font-weight: bold;
        }

        .login-link a:hover {
            text-decoration: underline;
        }

        .error-message {
            background: #ffe6e6;
            color: #d63031;
            padding: 10px;
            border-radius: 5px;
            margin-bottom: 20px;
            display: none;
        }

        .success-message {
            background: #e6ffe6;
            color: #27ae60;
            padding: 10px;
            border-radius: 5px;
            margin-bottom: 20px;
            display: none;
        }

        @media (max-width: 480px) {
            body { padding: 12px; align-items: flex-start; padding-top: 20px; }
            .register-container { width: 100%; max-width: 100%; padding: 24px 20px; }
            .register-header h1 { font-size: 24px; }
            .register-header p { font-size: 13px; }
            .form-group { margin-bottom: 18px; }
            .form-group label { font-size: 13px; }
            .form-group input { padding: 11px; font-size: 16px; } /* iOS防止自动缩放 */
            .form-group small { font-size: 11px; }
            .btn-register { padding: 13px; font-size: 15px; }
            .login-link { margin-top: 16px; font-size: 14px; }
        }
    </style>
</head>
<body>
    <div class="register-container">
        <div class="register-header">
            <h1>用户注册</h1>
        </div>

        <div id="errorMessage" class="error-message"></div>
        <div id="successMessage" class="success-message"></div>

        <form id="registerForm" onsubmit="handleRegister(event)">
            <div class="form-group">
                <label for="username">用户名 *</label>
                <input type="text" id="username" name="username" required minlength="3">
                <small>至少3个字符</small>
            </div>

            <div class="form-group">
                <label for="password">密码 *</label>
                <input type="password" id="password" name="password" required minlength="8">
                <small>至少8位</small>
            </div>

            <div class="form-group">
                <label for="confirm_password">确认密码 *</label>
                <input type="password" id="confirm_password" name="confirm_password" required>
            </div>

            <div class="form-group">
                <label for="email">邮箱 <span id="emailRequired" style="color: #d63031; display: none;">*</span></label>
                <input type="email" id="email" name="email">
                <small id="emailHint">选填，用于接收审核通知</small>
            </div>
            <div class="form-group">
                <label for="captcha">验证码</label>
                <div style="display: flex; gap: 10px; align-items: center;">
                    <input type="text" id="captcha" placeholder="请输入验证码" required style="flex: 1;">
                    <img id="captchaImage" src="" alt="验证码" style="height: 50px; border: 1px solid #ddd; border-radius: 4px; cursor: pointer;" onclick="refreshCaptcha()" title="点击刷新">
                    <button type="button" onclick="refreshCaptcha()" style="padding: 8px 15px; background: #f0f0f0; border: 1px solid #ddd; border-radius: 4px; cursor: pointer;">刷新</button>
                </div>
            </div>

            <button type="submit" class="btn-register">注册</button>
        </form>

        <div class="login-link">
            已有账号？ <a href="/login">立即登录</a>
        </div>
    </div>

    <script>
        let captchaSession = '';
        let emailVerifyEnabled = false;

        window.onload = async function() {
            await generateCaptcha();
            await checkEmailVerifyStatus();
        };

        async function checkEmailVerifyStatus() {
            try {
                const resp = await fetch('/api/email/verify-status');
                const data = await resp.json();
                emailVerifyEnabled = data.register_verify_enabled;

                if (emailVerifyEnabled) {
                    document.getElementById('emailRequired').style.display = 'inline';
                    document.getElementById('email').required = true;
                    document.getElementById('emailHint').textContent = '必填，用于账号验证';
                }
            } catch (e) {
                console.log('获取邮箱验证状态失败', e);
            }
        }

        async function handleRegister(event) {
            event.preventDefault();

            const username = document.getElementById('username').value.trim();
            const password = document.getElementById('password').value.trim();
            const confirmPassword = document.getElementById('confirm_password').value.trim();
            const email = document.getElementById('email').value.trim();
            const errorDiv = document.getElementById('errorMessage');
            const successDiv = document.getElementById('successMessage');

            errorDiv.style.display = 'none';
            successDiv.style.display = 'none';

            // 验证
            if (username.length < 3) {
                errorDiv.textContent = '用户名至少3个字符';
                errorDiv.style.display = 'block';
                return;
            }

            if (password.length < 8) {
                errorDiv.textContent = '密码长度至少8位';
                errorDiv.style.display = 'block';
                return;
            }

            if (!/[a-zA-Z]/.test(password) || !/\d/.test(password)) {
                errorDiv.textContent = '密码必须包含字母和数字';
                errorDiv.style.display = 'block';
                return;
            }

            if (password !== confirmPassword) {
                errorDiv.textContent = '两次输入的密码不一致';
                errorDiv.style.display = 'block';
                return;
            }

            // 邮箱验证启用时必填
            if (emailVerifyEnabled && !email) {
                errorDiv.textContent = '请填写邮箱地址用于账号验证';
                errorDiv.style.display = 'block';
                return;
            }

            // 邮箱格式验证
            if (email && !email.includes('@')) {
                errorDiv.textContent = '邮箱格式不正确';
                errorDiv.style.display = 'block';
                return;
            }

            try {
                const response = await fetch('/api/register', {
                    method: 'POST',
                    headers: {
                        'Content-Type': 'application/json'
                    },
                    body: JSON.stringify({ username, password, email, captcha_session: captchaSession, captcha: document.getElementById('captcha').value.trim() })
                });

                const data = await response.json();

                if (response.ok) {
                    // 根据是否需要邮箱验证显示不同的消息
                    if (data.need_verify) {
                        successDiv.innerHTML = data.message + '<br><small style="color: #666;">请检查您的邮箱（包括垃圾邮件文件夹）</small>';
                    } else {
                        successDiv.textContent = data.message || '注册成功，请等待管理员审核';
                    }
                    successDiv.style.display = 'block';

                    // 清空表单
                    document.getElementById('registerForm').reset();

                    // 3秒后跳转到登录页
                    setTimeout(() => {
                        window.location.href = '/login';
                    }, 3000);
                } else {
                    errorDiv.textContent = data.error || '注册失败';
                    errorDiv.style.display = 'block';
                    refreshCaptcha();
                }
            } catch (error) {
                errorDiv.textContent = '网络错误，请稍后重试';
                errorDiv.style.display = 'block';
            }
        }

        async function generateCaptcha() {
            const resp = await fetch('/api/generate_captcha', {method: 'POST', headers: {'Content-Type': 'application/json'}});
            const data = await resp.json();
            if (data.session_id && data.captcha_image) {
                captchaSession = data.session_id;
                document.getElementById('captchaImage').src = data.captcha_image;
            }
        }

        async function refreshCaptcha() { await generateCaptcha(); document.getElementById('captcha').value = ''; }
    </script>
</body>
</html>
