// src/controllers/orderController.js
const Order = require('../models/Order');
const Product = require('../models/Product');
const sendTelegramAlert = require('../utils/telegram');

// @desc    Create new order
// @route   POST /api/orders
// @access  Private
const addOrderItems = async (req, res) => {
  const {
    orderItems,
    paymentMethod,
    totalAmount, // In a strict app, calculate this on backend. For now, we trust frontend but verify basics.
    pickupDate
  } = req.body;

  if (orderItems && orderItems.length === 0) {
    return res.status(400).json({ message: 'No order items' });
  }

  try {
    // Optional: You could verify stock here and decrement it
    // For simplicity in this version, we just record the order
    
    const order = new Order({
      user: req.user._id,
      items: orderItems.map((x) => ({
        ...x,
        product: x.product,
      })),
      totalAmount,
      paymentMethod,
      pickupDate
    });

    const createdOrder = await order.save();
    const alertMsg = `
      <b>💰 New Order Received!</b>
      --------------------------------
      <b>Customer:</b> ${req.user.name}
      <b>Amount:</b> ₹${totalAmount}
      <b>Items:</b> ${orderItems.length} items
      <b>Payment:</b> ${paymentMethod === 'ONLINE_UPI' ? 'UPI' : 'Cash'}
      --------------------------------
      <i>Check Admin Panel for details.</i>
    `;
    // We don't await this so it doesn't slow down the user response
    sendTelegramAlert(alertMsg);

    res.status(201).json(createdOrder);
  } catch (error) {
    res.status(500).json({ message: error.message });
  }
};

// @desc    Get order by ID
// @route   GET /api/orders/:id
// @access  Private
const getOrderById = async (req, res) => {
  try {
    // Populate user name and email attached to order
    const order = await Order.findById(req.params.id).populate(
      'user',
      'name phone email'
    );

    if (order) {
      // Ensure only Admin or the Order Owner can view it
      if (req.user.role === 'admin' || order.user._id.toString() === req.user._id.toString()) {
        res.json(order);
      } else {
        res.status(401).json({ message: 'Not authorized to view this order' });
      }
    } else {
      res.status(404).json({ message: 'Order not found' });
    }
  } catch (error) {
    res.status(500).json({ message: error.message });
  }
};

// @desc    Get logged in user orders
// @route   GET /api/orders/myorders
// @access  Private
const getMyOrders = async (req, res) => {
  try {
    const orders = await Order.find({ user: req.user._id }).sort({ createdAt: -1 });
    res.json(orders);
  } catch (error) {
    res.status(500).json({ message: error.message });
  }
};

// @desc    Get all orders
// @route   GET /api/orders
// @access  Private/Admin
const getOrders = async (req, res) => {
  try {
    // Populate user info so Admin knows who ordered
    const orders = await Order.find({})
      .populate('user', 'id name phone')
      .sort({ createdAt: -1 });
    res.json(orders);
  } catch (error) {
    res.status(500).json({ message: error.message });
  }
};

// @desc    Update order status
// @route   PUT /api/orders/:id/status
// @access  Private/Admin
const updateOrderStatus = async (req, res) => {
  const { status } = req.body; // e.g. "Ready for Pickup"

  try {
    const order = await Order.findById(req.params.id);

    if (order) {
      order.status = status;
      if (status === 'Completed') {
        // If completed, we assume payment is done (Cash or UPI verified)
        // You can add specific payment logic here if needed
      }
      const updatedOrder = await order.save();
      // 🔥 Cancel Alert
      if (status === 'Cancelled') {
        sendTelegramAlert(`❌ <b>Order Cancelled</b>\nOrder #${order._id} was marked as Cancelled.`);
      }
      res.json(updatedOrder);
    } else {
      res.status(404).json({ message: 'Order not found' });
    }
  } catch (error) {
    res.status(500).json({ message: error.message });
  }
};

module.exports = {
  addOrderItems,
  getOrderById,
  getMyOrders,
  getOrders,
  updateOrderStatus,
};