/*
    *    Copyright 2010-2026 the original author or authors.
    *
    *    Licensed under the Apache License, Version 2.0 (the "License");
    *    you may not use this file except in compliance with the License.
    *    You may obtain a copy of the License at
    *
    *       https://www.apache.org/licenses/LICENSE-2.0
    *
   *    Unless required by applicable law or agreed to in writing, software
   *    distributed under the License is distributed on an "AS IS" BASIS,
   *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *    See the License for the specific language governing permissions and
   *    limitations under the License.
   */
  package org.mybatis.jpetstore.domain;
  
  import java.io.Serializable;
  import java.math.BigDecimal;
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  
  /**
   * The Class Cart.
   */
  public class Cart implements Serializable {
  
    /** The serial version uid. */
    private static final long serialVersionUID = 8329559983943337176L;
  
    /** The item map. */
    private final Map<String, CartItem> itemMap = new ConcurrentHashMap<>();
  
    /** The item list. */
    private final List<CartItem> itemList = new ArrayList<>();
  
    /**
     * Gets the cart items.
     *
     * @return the cart items
     */
    public Iterator<CartItem> getCartItems() {
      return itemList.iterator();
    }
  
    /**
     * Gets the cart item list.
     *
     * @return the cart item list
     */
    public List<CartItem> getCartItemList() {
      return itemList;
    }
  
    /**
     * Gets the number of items.
     *
     * @return the number of items
     */
    public int getNumberOfItems() {
      return itemList.size();
    }
  
    /**
     * Gets the all cart items.
     *
     * @return the all cart items
     */
    public Iterator<CartItem> getAllCartItems() {
      return itemList.iterator();
    }
  
    /**
     * Contains item id.
     *
     * @param itemId
     *          the item id
     *
     * @return true, if successful
     */
    public boolean containsItemId(String itemId) {
      return itemMap.containsKey(itemId);
    }
  
    /**
     * Adds the item.
     *
     * @param item
     *          the item
     * @param isInStock
     *          the is in stock
     */
    public void addItem(Item item, boolean isInStock) {
      CartItem cartItem = itemMap.get(item.getItemId());
      if (cartItem == null) {
        cartItem = new CartItem();
       cartItem.setItem(item);
       cartItem.setQuantity(0);
       cartItem.setInStock(isInStock);
       itemMap.put(item.getItemId(), cartItem);
       itemList.add(cartItem);
     }
     cartItem.incrementQuantity();
   }
 
   /**
    * Removes the item by id.
    *
    * @param itemId
    *          the item id
    *
    * @return the item
    */
   public Item removeItemById(String itemId) {
     CartItem cartItem = itemMap.remove(itemId);
     if (cartItem == null) {
       return null;
     } else {
       itemList.remove(cartItem);
       return cartItem.getItem();
     }
   }
 
   /**
    * Increment quantity by item id.
    *
    * @param itemId
    *          the item id
    */
   public void incrementQuantityByItemId(String itemId) {
     CartItem cartItem = itemMap.get(itemId);
     cartItem.incrementQuantity();
   }
 
   /**
    * Set quantity by item id.
    *
    * @param itemId
    *          the item id
    * @param quantity
    *          the quantity
    */
   public void setQuantityByItemId(String itemId, int quantity) {
     CartItem cartItem = itemMap.get(itemId);
     cartItem.setQuantity(quantity);
   }
 
   /**
    * Gets the sub total.
    *
    * @return the sub total
    */
   public BigDecimal getSubTotal() {
     return itemList.stream()
         .map(cartItem -> cartItem.getItem().getListPrice().multiply(new BigDecimal(cartItem.getQuantity())))
         .reduce(BigDecimal.ZERO, BigDecimal::add);
   }
 
 }