content: /**
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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.bigtop.datagenerators.bigpetstore.generators.transaction;
  
  import org.apache.bigtop.datagenerators.bigpetstore.Constants;
  import org.apache.bigtop.datagenerators.bigpetstore.datamodels.Product;
  import org.apache.bigtop.datagenerators.bigpetstore.datamodels.inputs.ProductCategory;
  import org.apache.bigtop.datagenerators.samplers.SeedFactory;
  
  public class ProductCategoryInventory
  {
  	private ProductCategoryUsageTrajectory trajectory;
  	private ProductCategoryUsageSimulator simulator;
  
  	public ProductCategoryInventory(ProductCategory productCategory, CustomerTransactionParameters parameters,
  			SeedFactory seedFactory)
  	{
  
  		double amountUsedAverage = productCategory.getBaseAmountUsedAverage() * parameters.countPetsBySpecies(productCategory.getApplicableSpecies());
  		double amountUsedVariance = productCategory.getBaseAmountUsedVariance() * parameters.countPetsBySpecies(productCategory.getApplicableSpecies());
  
  		trajectory = new ProductCategoryUsageTrajectory(0.0, 0.0);
  		simulator = new ProductCategoryUsageSimulator(productCategory.getDailyUsageRate(),
  				amountUsedAverage, amountUsedVariance, seedFactory);
  	}
  
  	public void simulatePurchase(double time, Product product) throws Exception
  	{
  		double amountPurchased = product.getFieldValueAsDouble(Constants.PRODUCT_QUANTITY);
  
  		double amountRemainingBeforePurchase = trajectory.amountAtTime(time);
  
  		trajectory = simulator.simulate(time, amountRemainingBeforePurchase + amountPurchased);
  	}
  
  	public double findExhaustionTime()
  	{
  		return trajectory.getLastTime();
  	}
  
  	public double findRemainingAmount(double time)
  	{
  		return trajectory.amountAtTime(time);
  	}
  }
  