/*
    *    Copyright 2009-2021 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
    *
    *       http://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.apache.ibatis.domain.jpetstore;
  
  import java.io.Serializable;
  import java.math.BigDecimal;
  import java.util.*;
  
  public class Cart implements Serializable {
  
    private static final long serialVersionUID = 1L;
  
    private final Map<String, CartItem> itemMap = Collections.synchronizedMap(new HashMap<>());
    private final List<CartItem> itemList = new ArrayList<>();
  
    public Iterator<CartItem> getCartItems() {
      return itemList.iterator();
    }
  
    public List<CartItem> getCartItemList() {
      return itemList;
    }
  
    public int getNumberOfItems() {
      return itemList.size();
    }
  
    public boolean containsItemId(String itemId) {
      return itemMap.containsKey(itemId);
    }
  
    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();
    }
  
    public Item removeItemById(String itemId) {
      CartItem cartItem = itemMap.remove(itemId);
      if (cartItem == null) {
        return null;
      } else {
        itemList.remove(cartItem);
        return cartItem.getItem();
      }
    }
  
    public void incrementQuantityByItemId(String itemId) {
      CartItem cartItem = itemMap.get(itemId);
      cartItem.incrementQuantity();
    }
  
    public void setQuantityByItemId(String itemId, int quantity) {
      CartItem cartItem = itemMap.get(itemId);
      cartItem.setQuantity(quantity);
    }
  
    public BigDecimal getSubTotal() {
      BigDecimal subTotal = new BigDecimal("0");
      Iterator<CartItem> items = getCartItems();
      while (items.hasNext()) {
        CartItem cartItem = items.next();
        Item item = cartItem.getItem();
        BigDecimal listPrice = item.getListPrice();
        BigDecimal quantity = new BigDecimal(String.valueOf(cartItem.getQuantity()));
        subTotal = subTotal.add(listPrice.multiply(quantity));
      }
      return subTotal;
    }
  
  }