/*
    *    Copyright 2010-2022 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.service;
  
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import org.mybatis.jpetstore.domain.Item;
  import org.mybatis.jpetstore.domain.Order;
  import org.mybatis.jpetstore.domain.Sequence;
  import org.mybatis.jpetstore.mapper.ItemMapper;
  import org.mybatis.jpetstore.mapper.LineItemMapper;
  import org.mybatis.jpetstore.mapper.OrderMapper;
  import org.mybatis.jpetstore.mapper.SequenceMapper;
  import org.springframework.stereotype.Service;
  import org.springframework.transaction.annotation.Transactional;
  
  /**
   * The Class OrderService.
   *
   * @author Eduardo Macarron
   */
  @Service
  public class OrderService {
  
    private final ItemMapper itemMapper;
    private final OrderMapper orderMapper;
    private final SequenceMapper sequenceMapper;
    private final LineItemMapper lineItemMapper;
  
    public OrderService(ItemMapper itemMapper, OrderMapper orderMapper, SequenceMapper sequenceMapper,
        LineItemMapper lineItemMapper) {
      this.itemMapper = itemMapper;
      this.orderMapper = orderMapper;
      this.sequenceMapper = sequenceMapper;
      this.lineItemMapper = lineItemMapper;
    }
  
    /**
     * Insert order.
     *
     * @param order
     *          the order
     */
    @Transactional
    public void insertOrder(Order order) {
      order.setOrderId(getNextId("ordernum"));
      order.getLineItems().forEach(lineItem -> {
        String itemId = lineItem.getItemId();
        Integer increment = lineItem.getQuantity();
        Map<String, Object> param = new HashMap<>(2);
        param.put("itemId", itemId);
        param.put("increment", increment);
        itemMapper.updateInventoryQuantity(param);
      });
  
      orderMapper.insertOrder(order);
      orderMapper.insertOrderStatus(order);
      order.getLineItems().forEach(lineItem -> {
        lineItem.setOrderId(order.getOrderId());
        lineItemMapper.insertLineItem(lineItem);
      });
    }
  
    /**
     * Gets the order.
     *
     * @param orderId
     *          the order id
     *
     * @return the order
     */
    @Transactional
    public Order getOrder(int orderId) {
      Order order = orderMapper.getOrder(orderId);
      order.setLineItems(lineItemMapper.getLineItemsByOrderId(orderId));
  
      order.getLineItems().forEach(lineItem -> {
        Item item = itemMapper.getItem(lineItem.getItemId());
        item.setQuantity(itemMapper.getInventoryQuantity(lineItem.getItemId()));
        lineItem.setItem(item);
      });
  
      return order;
    }
 
   /**
    * Gets the orders by username.
    *
    * @param username
    *          the username
    *
    * @return the orders by username
    */
   public List<Order> getOrdersByUsername(String username) {
     return orderMapper.getOrdersByUsername(username);
   }
 
   /**
    * Gets the next id.
    *
    * @param name
    *          the name
    *
    * @return the next id
    */
   public int getNextId(String name) {
     Sequence sequence = sequenceMapper.getSequence(new Sequence(name, -1));
     if (sequence == null) {
       throw new RuntimeException(
           "Error: A null sequence was returned from the database (could not get next " + name + " sequence).");
     }
     Sequence parameterObject = new Sequence(name, sequence.getNextId() + 1);
     sequenceMapper.updateSequence(parameterObject);
     return sequence.getNextId();
   }
 
 }