// 页面加载时检查是否已登录
(function() {
    const token = localStorage.getItem('token');
    if (token) {
        window.location.href = '/chat.php';
    }
})();

// 登录表单提交
document.getElementById('loginForm').addEventListener('submit', async function(e) {
    e.preventDefault();
    const btn = document.getElementById('loginBtn');
    const errorEl = document.getElementById('loginError');
    const username = document.getElementById('username').value.trim();
    const password = document.getElementById('password').value;
    
    if (!username || !password) {
        errorEl.textContent = '请输入用户名和密码';
        errorEl.classList.remove('hidden');
        return;
    }
    
    btn.disabled = true;
    btn.textContent = '登录中...';
    errorEl.classList.add('hidden');
    
    try {
        const response = await fetch('/api/auth/login', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ username, password })
        });
        
        const data = await response.json();
        
        if (data.success) {
            localStorage.setItem('token', data.data.token);
            window.location.href = '/chat.php';
        } else {
            errorEl.textContent = data.message || '登录失败';
            errorEl.classList.remove('hidden');
        }
    } catch (err) {
        errorEl.textContent = '网络错误，请稍后重试';
        errorEl.classList.remove('hidden');
    } finally {
        btn.disabled = false;
        btn.textContent = '登录';
    }
});