// 设置cookie
function setCookie(name, value, days) {
    let expires = "";
    if (days) {
        const date = new Date();
        date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
        expires = "; expires=" + date.toUTCString();
    }
    document.cookie = name + "=" + (value || "") + expires + "; path=/";
}

// 获取cookie
function getCookie(name) {
    const nameEQ = name + "=";
    const ca = document.cookie.split(';');
    for (let i = 0; i < ca.length; i++) {
        let c = ca[i];
        while (c.charAt(0) == ' ') c = c.substring(1, c.length);
        if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);
    }
    return null;
}

// 删除cookie
function deleteCookie(name) {
    document.cookie = name + '=; Path=/; Expires=Thu, 01 Jan 1970 00:00:01 GMT;';
}

// 检查是否有保存的登录信息
window.onload = function() {
    const savedUsername = getCookie('username');
    const savedPassword = getCookie('password');
    if (savedUsername && savedPassword) {
        document.getElementById('username').value = savedUsername;
        document.getElementById('password').value = savedPassword;
        document.getElementById('remember').checked = true;
    }
};

// 登录表单提交处理
document.getElementById('loginForm').addEventListener('submit', function(e) {
    e.preventDefault();
    
    const username = document.getElementById('username').value;
    const password = document.getElementById('password').value;
    const remember = document.getElementById('remember').checked;
    const usernameError = document.getElementById('usernameError');
    const passwordError = document.getElementById('passwordError');
    
    // 重置错误信息
    usernameError.style.display = 'none';
    passwordError.style.display = 'none';
    
    // 简单的表单验证
    if (!username) {
        usernameError.textContent = '请输入用户名';
        usernameError.style.display = 'block';
        return;
    }
    
    if (!password) {
        passwordError.textContent = '请输入密码';
        passwordError.style.display = 'block';
        return;
    }
    
    // 处理记住我功能
    if (remember) {
        setCookie('username', username, 7); // 保存7天
        setCookie('password', password, 7);
    } else {
        deleteCookie('username');
        deleteCookie('password');
    }
    
});