const express = require("express");
const bodyParser = require("body-parser");

const app = express();
const PORT = 8080;

// Middleware to parse JSON
app.use(bodyParser.json());

// In-memory data store for demonstration
let cartData = {
  cart: {
    accessories: {},
  },
};

// CREATE - Add or update cart items
app.post("/cart", (req, res) => {
  const { cart } = req.body;

  if (!cart) {
    return res.status(400).json({ error: "Cart data is required" });
  }

  // Merge new cart data with existing cart data
  cartData = {
    ...cartData,
    cart: {
      ...cartData.cart,
      ...cart,
    },
  };

  res.status(201).json({
    message: "Cart updated successfully",
    cart: cartData,
  });
});

// READ - Get the entire cart
app.get("/cart", (req, res) => {
  res.json({
    message: "Cart retrieved successfully",
    cart: cartData,
  });
});

// READ - Get a specific item in the cart
app.get("/cart/accessories/:key", (req, res) => {
  const { key } = req.params;

  const item = cartData.cart.accessories[key];

  if (!item) {
    return res.status(404).json({ error: `Item with key '${key}' not found` });
  }

  res.json({
    message: "Item retrieved successfully",
    item: { [key]: item },
  });
});

// UPDATE - Update a specific item in the cart
app.put("/cart/accessories/:key", (req, res) => {
  const { key } = req.params;
  const { value } = req.body;

  if (!value) {
    return res.status(400).json({ error: "Value is required" });
  }

  if (!cartData.cart.accessories[key]) {
    return res.status(404).json({ error: `Item with key '${key}' not found` });
  }

  // Update the item
  cartData.cart.accessories[key] = value;

  res.json({
    message: "Item updated successfully",
    cart: cartData,
  });
});

// DELETE - Remove a specific item from the cart
app.delete("/cart/accessories/:key", (req, res) => {
  const { key } = req.params;

  if (!cartData.cart.accessories[key]) {
    return res.status(404).json({ error: `Item with key '${key}' not found` });
  }

  // Delete the item
  delete cartData.cart.accessories[key];

  res.json({
    message: "Item deleted successfully",
    cart: cartData,
  });
});

// Start the server
app.listen(PORT, () => {
  console.log(`Server is running on http://localhost:${PORT}`);
});