// ========================================
// API CLIENT — Frontend → Backend Communication
// ========================================
const API_BASE = (window.location.hostname === '127.0.0.1' || window.location.port === '5500')
    ? 'http://localhost:3000/api'
    : '/api';

const API = {
    // === PRODUCTS ===
    async getProducts() {
        try {
            const res = await fetch(`${API_BASE}/products`);
            if (!res.ok) throw new Error('Products fetch failed');
            return await res.json();
        } catch (err) {
            console.warn('API unavailable, using local data:', err.message);
            return null; // Fallback to local DEFAULT_PRODUCTS
        }
    },

    async getProduct(id) {
        try {
            const res = await fetch(`${API_BASE}/products/${id}`);
            if (!res.ok) return null;
            return await res.json();
        } catch {
            return null;
        }
    },

    async createProduct(data) {
        const res = await fetch(`${API_BASE}/products`, {
            method: 'POST', headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify(data)
        });
        return await res.json();
    },

    async updateProduct(id, data) {
        const res = await fetch(`${API_BASE}/products/${id}`, {
            method: 'PUT', headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify(data)
        });
        return await res.json();
    },

    async deleteProduct(id) {
        const res = await fetch(`${API_BASE}/products/${id}`, { method: 'DELETE' });
        return await res.json();
    },

    // === AUTH ===
    async register(name, phone, password, email) {
        const res = await fetch(`${API_BASE}/auth/register`, {
            method: 'POST', headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ name, phone, password, email })
        });
        return await res.json();
    },

    async login(phone, password) {
        const res = await fetch(`${API_BASE}/auth/login`, {
            method: 'POST', headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ phone, password })
        });
        return await res.json();
    },

    async getProfile(userId) {
        const res = await fetch(`${API_BASE}/auth/profile/${userId}`);
        return await res.json();
    },

    async updateProfile(userId, data) {
        const res = await fetch(`${API_BASE}/auth/profile/${userId}`, {
            method: 'PUT', headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify(data)
        });
        return await res.json();
    },

    // === ORDERS ===
    async getOrders() {
        const res = await fetch(`${API_BASE}/orders`);
        return await res.json();
    },

    async getUserOrders(userId) {
        const res = await fetch(`${API_BASE}/orders/user/${userId}`);
        return await res.json();
    },

    async createOrder(data) {
        const res = await fetch(`${API_BASE}/orders`, {
            method: 'POST', headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify(data)
        });
        return await res.json();
    },

    async updateOrderStatus(orderId, status) {
        const res = await fetch(`${API_BASE}/orders/${orderId}/status`, {
            method: 'PUT', headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ status })
        });
        return await res.json();
    },

    // === SETTINGS ===
    async getSettings() {
        try {
            const res = await fetch(`${API_BASE}/settings`);
            return await res.json();
        } catch {
            return {};
        }
    },

    async updateSettings(data) {
        const res = await fetch(`${API_BASE}/settings`, {
            method: 'PUT', headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify(data)
        });
        return await res.json();
    },

    async adminLogin(password) {
        const res = await fetch(`${API_BASE}/settings/admin-login`, {
            method: 'POST', headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ password })
        });
        return await res.json();
    }
};