/**
 * Retrieves cart data from localStorage, if available.
 *
 * @returns {Object} - The cart data as an object, or an empty object if not found.
 */
const getCart = () => {
  if (typeof window !== 'undefined' && window.localStorage) {
    const cart = localStorage.getItem('cart')
    if (cart) return JSON.parse(cart)
  }
  return {}
}

/**
 * Saves cart data to localStorage, if available.
 *
 * @param {Object} cart - The cart data to be saved.
 * @returns {boolean} - Returns `true` if cart data is saved successfully, `false` otherwise.
 */
const setCart = (cart) => {
  if (typeof window !== 'undefined' && window.localStorage) {
    const storageChangeEvent = new Event('localStorageChange')
    localStorage.setItem('cart', JSON.stringify(cart))
    window.dispatchEvent(storageChangeEvent)
    return true
  }
  return false
}

/**
 * Retrieves an item from the cart data based on the given product ID.
 *
 * @param {Object} options - The options object containing the productId.
 * @param {string} options.productId - The ID of the product to be retrieved from the cart.
 * @returns {Object} - Returns the item object from the cart data, or `undefined` if not found.
 */
const getItemCart = ({ productId }) => {
  let cart = getCart()
  return cart[productId]
}

/**
 * Updates an item in the cart data with the given productId, quantity, and selected status.
 *
 * @param {Object} options - The options object containing the productId, quantity, and selected status.
 * @param {string} options.productId - The ID of the product to be updated in the cart.
 * @param {number} options.quantity - The new quantity of the product in the cart.
 * @param {boolean} [options.selected=false] - The new selected status of the product in the cart. Default is `false`.
 * @returns {boolean} - Returns `true`.
 */
const updateItemCart = ({ productId, quantity, selected = false }) => {
  let cart = getCart()
  quantity = parseInt(quantity)
  cart[productId] = { productId, quantity, selected }
  setCart(cart)
  return true
}

/**
 * Deletes an item from the cart data with the given productId.
 *
 * @param {Object} options - The options object containing the productId.
 * @param {string} options.productId - The ID of the product to be deleted from the cart.
 * @returns {boolean} - Returns `true`.
 */
const deleteItemCart = ({ productId }) => {
  let cart = getCart()
  delete cart[productId]
  setCart(cart)
  return true
}

export { getCart, getItemCart, updateItemCart, deleteItemCart }