// js/init.js
document.addEventListener('DOMContentLoaded', () => {
    const DOMElements = {
        initForm: document.getElementById('init-form'),
        initButton: null, 
        toastContainer: document.getElementById('toast-container'),
        usernameInput: document.getElementById('username'),
        passwordInput: document.getElementById('password'),
        confirmPasswordInput: document.getElementById('confirm_password'),
    };

    const INIT_API_URL = '/v0/api/auth/init';
    const PASSWORD_MIN_LENGTH = 8;
    const TOAST_DEFAULT_DURATION = 3000;
    const REDIRECT_DELAY_SUCCESS = 1500;

    const theme = {
        init: () => {
            const storedTheme = localStorage.getItem('theme');
            const systemPrefersDark = window.matchMedia('(prefers-color-scheme: dark)').matches;
            const currentTheme = storedTheme || (systemPrefersDark ? 'dark' : 'light');
            document.documentElement.dataset.theme = currentTheme;
        }
    };

    const toast = {
        _container: null,
        _icons: { success: 'fa-check-circle', error: 'fa-times-circle', info: 'fa-info-circle' },

        init: (containerElement) => {
            if (!containerElement) {
                console.error('Toast container element not found.');
                return;
            }
            toast._container = containerElement;
            toast._container.addEventListener('click', (e) => {
                if (e.target.dataset.toastClose !== undefined) {
                    toast._hideToast(e.target.closest('.toast'));
                }
            });
        },

        show: (message, type = 'info', duration = TOAST_DEFAULT_DURATION) => {
            if (!toast._container) {
                console.error('Toast module not initialized. Container is missing.');
                return;
            }

            const iconClass = toast._icons[type] || 'fa-info-circle';
            const toastElement = document.createElement('div');
            toastElement.className = `toast ${type}`;
            toastElement.innerHTML = `
                <i class="toast-icon fa-solid ${iconClass}"></i>
                <p class="toast-message">${message}</p>
                <button class="toast-close" data-toast-close>×</button>
            `;
            toast._container.appendChild(toastElement);
            requestAnimationFrame(() => toastElement.classList.add('show'));
            setTimeout(() => toast._hideToast(toastElement), duration);
        },

        _hideToast: (toastElement) => {
            if (!toastElement) return;
            toastElement.classList.remove('show');
            toastElement.addEventListener('transitionend', () => toastElement.remove(), { once: true });
        }
    };

    async function handleInitSubmit(e) {
        e.preventDefault();

        // 1. 获取并修剪输入值
        const username = DOMElements.usernameInput.value.trim(); // 获取用户名并去除前后空格
        const password = DOMElements.passwordInput.value.trim();
        const confirmPassword = DOMElements.confirmPasswordInput.value.trim();

        // 2. 添加用户名输入框的空值验证
        if (username === '') {
            toast.show('管理员用户名不能为空', 'error');
            DOMElements.usernameInput.focus();
            return;
        }
        // 其他密码验证逻辑不变
        if (password === '') {
            toast.show('密码不能为空', 'error');
            DOMElements.passwordInput.focus();
            return;
        }
        if (confirmPassword === '') {
            toast.show('确认密码不能为空', 'error');
            DOMElements.confirmPasswordInput.focus();
            return;
        }
        
        if (password !== confirmPassword) {
            toast.show('两次输入的密码不匹配', 'error');
            DOMElements.passwordInput.focus();
            return;
        }
        if (password.length < PASSWORD_MIN_LENGTH) {
            toast.show(`密码长度至少为 ${PASSWORD_MIN_LENGTH} 位`, 'error');
            DOMElements.passwordInput.focus();
            return;
        }

        DOMElements.initButton.disabled = true;
        DOMElements.initButton.querySelector('span').textContent = '设置中...';

        try {
            const formData = new FormData(DOMElements.initForm);
            formData.set('username', username); // 确保发送的是修剪过的用户名
            formData.set('password', password); // 确保发送的是修剪过的密码
            formData.delete('confirm_password');

            const response = await fetch(INIT_API_URL, {
                method: 'POST',
                body: new URLSearchParams(formData)
            });

            const result = await response.json(); 

            if (response.ok) {
                toast.show('管理员账户创建成功！正在跳转到登录页面...', 'success');
                setTimeout(() => { window.location.href = '/login.html'; }, REDIRECT_DELAY_SUCCESS);
            } else {
                throw new Error(result.error || `初始化失败: ${response.status}`);
            }
        } catch (error) {
            toast.show(error.message, 'error');
            DOMElements.initButton.disabled = false;
            DOMElements.initButton.querySelector('span').textContent = '完成设置';
        }
    }

    function initApp() {
        theme.init(); 

        if (DOMElements.initForm) {
            DOMElements.initButton = DOMElements.initForm.querySelector('button[type="submit"]');
            
            toast.init(DOMElements.toastContainer);

            DOMElements.initForm.addEventListener('submit', handleInitSubmit);
        } else {
            console.error('Init form element not found. Script may not function correctly.');
        }
    }

    initApp();
});