import { initializeChat as serviceInitializeChat, sendMessage as serviceSendMessage, sendOrder, getProducts } from './service.js';

let userName = '';
let userTable = null;

let products = [];

let cart = [];
let chatHistory = [
    { role: "system", content: "¡Hola! Soy tu asistente en Biergarten Klein. ¿Te gustaría una recomendación de nuestras cervezas artesanales?" }
];

// --- Elementos del DOM ---
const productListElement = document.getElementById("productList");
const cartItemsElement = document.getElementById("cartItems");
const cartTotalElement = document.getElementById("cartTotal");
const emptyCartTextElement = document.getElementById("emptyCartText");
const checkoutButton = document.getElementById("checkoutButton");
const originalCheckoutButtonText = checkoutButton ? checkoutButton.textContent : "Finalizar Pedido";

const chatMessagesElement = document.getElementById("chatMessages");
const chatInputElement = document.getElementById("chatInput");
const sendChatButton = document.getElementById("sendChatButton");
const aiLoadingIndicator = document.getElementById("aiLoadingIndicator");

// --- Modales ---
const welcomeModal = document.getElementById("welcomeModal");
const startOrderButton = document.getElementById("startOrderButton");
const userNameInput = document.getElementById("userNameInput");
const userTableInput = document.getElementById("userTableInput");

const orderConfirmationModal = document.getElementById("orderConfirmationModal");
const closeConfirmationModalButton = document.getElementById("closeConfirmationModalButton");
const orderErrorModal = document.getElementById("orderErrorModal");
const closeOrderErrorModalButton = document.getElementById("closeOrderErrorModalButton");
const newOrderButton = document.getElementById("newOrderButton");
const retryButton = document.getElementById("retryButton");

// --- Loader Global ---
let globalLoaderElement = null;

function createGlobalLoader() {
    if (document.getElementById('globalLoader')) return;
    globalLoaderElement = document.createElement('div');
    globalLoaderElement.id = 'globalLoader';
    globalLoaderElement.className = 'fixed inset-0 bg-black bg-opacity-80 flex flex-col items-center justify-center z-[2000] transition-opacity duration-300 ease-in-out pointer-events-none';
    globalLoaderElement.style.opacity = '0';
    globalLoaderElement.innerHTML = `
        <div style="border: 6px solid rgba(255, 255, 255, 0.2); border-radius: 50%; border-top: 6px solid #dc2626; width: 60px; height: 60px; animation: spin 1s linear infinite;"></div>
        <p class="text-white text-xl mt-4">Procesando su pedido...</p>
    `;
    document.body.appendChild(globalLoaderElement);
}

function showGlobalLoader() {
    if (!globalLoaderElement) createGlobalLoader();
    globalLoaderElement.style.display = 'flex';
    setTimeout(() => { if (globalLoaderElement) globalLoaderElement.style.opacity = '1'; }, 10);
}

function hideGlobalLoader() {
    if (globalLoaderElement) {
        globalLoaderElement.style.opacity = '0';
        setTimeout(() => { if (globalLoaderElement) globalLoaderElement.style.display = 'none'; }, 300);
    }
}

document.getElementById("currentYear").textContent = new Date().getFullYear().toString();

function formatPrice(price) {
    return price.toLocaleString("es-CL", { style: "currency", currency: "CLP" });
}

async function processOrder() {
    if (cart.length === 0) return;
    showGlobalLoader();
    if (checkoutButton) {
        checkoutButton.disabled = true;
        checkoutButton.textContent = "Procesando...";
    }

    try {
        const orderData = {
            customerName: userName,
            table: userTable,
            items: cart.map(item => ({ id: item.id, name: item.name, quantity: item.quantity, price: item.price, itemTotal: item.price * item.quantity })),
            totalAmount: cart.reduce((sum, item) => sum + item.price * item.quantity, 0),
            orderDate: new Date().toISOString(),
        };
        console.log("Enviando Pedido:", orderData);
        await sendOrder(orderData);
        if (orderConfirmationModal) orderConfirmationModal.style.display = "flex";
    } catch (error) {
        console.error("Error al procesar la orden:", error);
        if (orderErrorModal) {
            const errorMessageElement = orderErrorModal.querySelector('p.text-lg');
            if (errorMessageElement) {
                errorMessageElement.textContent = `Hubo un problema: ${error.message || "Por favor, inténtalo de nuevo."}`;
            }
            orderErrorModal.style.display = "flex";
        }
    } finally {
        hideGlobalLoader();
        if (checkoutButton) {
            checkoutButton.disabled = cart.length === 0;
            checkoutButton.textContent = originalCheckoutButtonText;
        }
    }
}

async function renderProducts() {
    if (!productListElement) return;
    productListElement.innerHTML = "";
    products = await getProducts();
    products.forEach(product => {
        const productCardContainer = document.createElement('div');
        productCardContainer.innerHTML = `
            <div class="product-card rounded-lg shadow-lg overflow-hidden transition-all duration-300 hover:shadow-2xl hover:transform hover:-translate-y-1 flex flex-col sm:flex-row">
                <img src="${product.image}" alt="[Imagen de ${product.name}]" class="w-full sm:w-1/3 h-48 sm:h-auto object-cover">
                <div class="p-6 flex flex-col justify-between flex-grow">
                    <div>
                        <h4 class="text-xl font-semibold mb-1">${product.name}</h4>
                        <p class="text-gray-400 text-base mb-3">${product.description}</p>
                    </div>
                    <div class="flex justify-between items-center mt-4">
                        <span class="text-2xl font-bold accent-red">${formatPrice(product.price)}</span>
                        <button data-product-id="${product.id}" class="add-to-cart-btn bg-accent-red hover:bg-red-700 text-white font-semibold py-2 px-4 rounded-lg transition duration-300 ease-in-out text-sm">
                            Agregar
                        </button>
                    </div>
                </div>
            </div>
        `;
        productListElement.appendChild(productCardContainer.firstElementChild);
    });

    document.querySelectorAll('.add-to-cart-btn').forEach(button => {
        button.addEventListener('click', (event) => {
            const productId = parseInt(event.target.closest('button').dataset.productId);
            addToCart(productId, event.target.closest('button'));
        });
    });
}

window.addToCart = async (productId, buttonElement = null) => {
    const product = products.find(p => p.id === productId);
    if (!product) return;
    const cartItem = cart.find(item => item.id === productId);
    if (cartItem) {
        cartItem.quantity++;
    } else {
        cart.push({ ...product, quantity: 1 });
    }

    if (buttonElement) {
        const originalText = buttonElement.textContent;
        buttonElement.textContent = "✔ Agregado!";
        buttonElement.classList.replace('bg-accent-red', 'bg-green-500');
        buttonElement.classList.remove("hover:bg-red-700");
        buttonElement.disabled = true;
        setTimeout(() => {
            buttonElement.textContent = originalText;
            buttonElement.classList.replace('bg-green-500', 'bg-accent-red');
            buttonElement.classList.add("hover:bg-red-700");
            buttonElement.disabled = false;
        }, 1500);
    }
    updateCartDisplay();
};

window.removeFromCart = (productId, removeAll = false) => {
    const itemIndex = cart.findIndex(item => item.id === productId);
    if (itemIndex > -1) {
        if (removeAll || cart[itemIndex].quantity === 1) {
            cart.splice(itemIndex, 1);
        } else {
            cart[itemIndex].quantity--;
        }
    }
    updateCartDisplay();
};

function updateCartDisplay() {
    if (!cartItemsElement || !emptyCartTextElement || !checkoutButton) return;
    cartItemsElement.innerHTML = "";
    if (cart.length === 0) {
        emptyCartTextElement.classList.remove("hidden");
        checkoutButton.disabled = true;
    } else {
        emptyCartTextElement.classList.add("hidden");
        checkoutButton.disabled = false;
        cart.forEach(item => {
            const cartItemHTML = `
                <div class="flex justify-between items-center border-b border-gray-700 pb-2 last:border-b-0 mb-2">
                    <div>
                        <h4 class="font-semibold text-base">${item.name} <span class="text-sm text-gray-400">(x${item.quantity})</span></h4>
                        <p class="text-sm accent-red">${formatPrice(item.price * item.quantity)}</p>
                    </div>
                    <div class="flex items-center gap-1 sm:gap-2">
                        <button onclick="addToCart(${item.id})" class="text-green-500 hover:text-green-400 text-lg sm:text-xl font-bold p-1 rounded-full hover:bg-gray-700 transition-colors">+</button>
                        <button onclick="removeFromCart(${item.id})" class="text-yellow-500 hover:text-yellow-400 text-lg sm:text-xl font-bold p-1 rounded-full hover:bg-gray-700 transition-colors">-</button>
                        <button onclick="removeFromCart(${item.id}, true)" class="text-red-500 hover:text-red-400 text-base sm:text-lg p-1 rounded-full hover:bg-gray-700 transition-colors">
                            <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor" class="w-4 h-4 sm:w-5 sm:h-5 pointer-events-none"><path stroke-linecap="round" stroke-linejoin="round" d="M14.74 9l-.346 9m-4.788 0L9.26 9m9.968-3.21c.342.052.682.107 1.022.166m-1.022-.165L18.16 19.673a2.25 2.25 0 01-2.244 2.077H8.084a2.25 2.25 0 01-2.244-2.077L4.772 5.79m14.456 0a48.108 48.108 0 00-3.478-.397m-12.56 0c1.153 0 2.24.032 3.22.096M15 5.79V4.5A2.25 2.25 0 0012.75 2.25h-1.5A2.25 2.25 0 009 4.5v1.29m0 0L9 19.5M15 5.79l-1.5-1.5M9 5.79l1.5-1.5" /></svg>
                        </button>
                    </div>
                </div>
            `;
            cartItemsElement.innerHTML += cartItemHTML;
        });
    }
    calculateTotal();
}

function calculateTotal() {
    if (!cartTotalElement) return;
    const total = cart.reduce((sum, item) => sum + item.price * item.quantity, 0);
    cartTotalElement.textContent = formatPrice(total);
}

// --- Lógica del Chat ---
function displayChatMessage(sender, message) {
    if (!chatMessagesElement) return;
    const bubbleClass = sender === "user" ? "chat-bubble-user" : "chat-bubble-ai";
    const messageDiv = document.createElement("div");
    messageDiv.classList.add("chat-bubble", bubbleClass);
    messageDiv.innerHTML = sender === "ai" && window.marked ? marked.parse(message) : message;
    chatMessagesElement.appendChild(messageDiv);
    chatMessagesElement.scrollTop = chatMessagesElement.scrollHeight;
}

async function sendMessageToAI() {
    if (!chatInputElement || !aiLoadingIndicator) return;
    const userInput = chatInputElement.value.trim();
    if (!userInput) return;

    displayChatMessage("user", userInput);
    chatInputElement.value = '';
    aiLoadingIndicator.classList.remove("hidden");

    try {
        const response = await serviceSendMessage(userInput, chatHistory);
        if (!response) {
            displayChatMessage("ai", "Hubo un problema al conectar con el Chef IA.");
        } else if (response === "not_init") {
            displayChatMessage("ai", "El chat no está inicializado. Intentando reconectar...");
            if (await serviceInitializeChat()) {
                 displayChatMessage("ai", "Reconexión exitosa. Por favor, envía tu mensaje de nuevo.");
            } else {
                 displayChatMessage("ai", "Fallo la reconexión. Por favor, refresca la página.");
            }
        } else if (response.assistantResponse) {
            chatHistory = response.messageList;
            displayChatMessage("ai", response.assistantResponse);
        }
    } catch (error) {
        console.error("Error enviando mensaje a IA:", error);
        displayChatMessage("ai", `Error: ${error.message || "No se pudo conectar con el Chef IA."}`);
    } finally {
        aiLoadingIndicator.classList.add("hidden");
        if (chatInputElement) chatInputElement.focus();
    }
}

// --- Event Listeners ---
document.addEventListener("DOMContentLoaded", async () => {
    createGlobalLoader();
    updateCartDisplay();
    
    if (welcomeModal && startOrderButton) {
        startOrderButton.onclick = () => {
            const name = userNameInput.value.trim();
            const table = userTableInput.value;
            if (name && table) {
                userName = name;
                userTable = parseInt(table);
                welcomeModal.style.display = 'none';
                // Iniciar la app después de obtener los datos
                initializeApp();
            } else {
                alert('Por favor, ingresa tu nombre y número de mesa para continuar.');
            }
        }
    }

    async function initializeApp() {
        await renderProducts();
        try {
            if (await serviceInitializeChat()) {
                console.log("Chat AI Asistente inicializado exitosamente.");
            } else {
                console.warn("Chat AI no pudo inicializarse.");
                displayChatMessage("ai", "No se pudo conectar con el Chef IA en este momento.");
            }
        } catch (error) {
            console.error("Error durante la inicialización del Chat AI:", error);
            displayChatMessage("ai", "Error al iniciar el Chef IA.");
        }
    }
});

if (checkoutButton) checkoutButton.addEventListener("click", processOrder);
if (closeConfirmationModalButton) closeConfirmationModalButton.addEventListener("click", () => { orderConfirmationModal.style.display = "none"; });
if (closeOrderErrorModalButton) closeOrderErrorModalButton.addEventListener("click", () => { orderErrorModal.style.display = "none"; });
if (newOrderButton) {
    newOrderButton.addEventListener("click", () => {
        orderConfirmationModal.style.display = "none";
        cart = [];
        updateCartDisplay();
    });
}
if (retryButton) retryButton.addEventListener("click", () => { orderErrorModal.style.display = "none"; });

if (sendChatButton) sendChatButton.addEventListener("click", sendMessageToAI);
if (chatInputElement) {
    chatInputElement.addEventListener("keypress", (event) => {
        if (event.key === "Enter") {
            event.preventDefault();
            sendMessageToAI();
        }
    });
}