/*
    * 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.commons.math4.legacy.stat.data;
  
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStreamReader;
  import java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.Method;
  import java.net.URL;
  import java.util.HashMap;
  import java.util.Map;
  
  import org.apache.commons.math4.legacy.TestUtils;
  import org.apache.commons.math4.legacy.stat.descriptive.DescriptiveStatistics;
  import org.apache.commons.math4.legacy.stat.descriptive.SummaryStatistics;
  import org.junit.After;
  import org.junit.Assert;
  import org.junit.Before;
  import org.junit.Test;
  
  /**
   */
  public abstract class CertifiedDataAbstractTest {
  
      private DescriptiveStatistics descriptives;
  
      private SummaryStatistics summaries;
  
      private Map<String, Double> certifiedValues;
  
      @Before
      public void setUp() throws IOException {
          descriptives = new DescriptiveStatistics();
          summaries = new SummaryStatistics();
          certifiedValues = new HashMap<>();
  
          loadData();
      }
  
      private void loadData() throws IOException {
          BufferedReader in = null;
  
          try {
              URL resourceURL = getClass().getClassLoader().getResource(getResourceName());
              in = new BufferedReader(new InputStreamReader(resourceURL.openStream()));
  
              String line = in.readLine();
              while (line != null) {
  
                  /* this call to StringUtils did little for the
                   * following conditional structure
                   */
                  line = line.trim();
  
                  // not empty line or comment
                  if (!("".equals(line) || line.startsWith("#"))) {
                      int n = line.indexOf('=');
                      if (n == -1) {
                          // data value
                          double value = Double.parseDouble(line);
                          descriptives.addValue(value);
                          summaries.addValue(value);
                      } else {
                          // certified value
                          String name = line.substring(0, n).trim();
                          String valueString = line.substring(n + 1).trim();
                          Double value = Double.valueOf(valueString);
                          certifiedValues.put(name, value);
                      }
                  }
                  line = in.readLine();
              }
          } finally {
              if (in != null) {
                  in.close();
              }
          }
      }
  
      protected abstract String getResourceName();
  
      protected double getMaximumAbsoluteError() {
          return 1.0e-5;
     }
 
     @After
     public void tearDown() {
         descriptives.clear();
         descriptives = null;
 
         summaries.clear();
         summaries = null;
 
         certifiedValues.clear();
         certifiedValues = null;
     }
 
     @Test
     public void testCertifiedValues() {
         for (String name : certifiedValues.keySet()) {
             Double expectedValue = certifiedValues.get(name);
 
             Double summariesValue = getProperty(summaries, name);
             if (summariesValue != null) {
                 TestUtils.assertEquals("summary value for " + name + " is incorrect.",
                                        summariesValue.doubleValue(), expectedValue.doubleValue(),
                                        getMaximumAbsoluteError());
             }
 
             Double descriptivesValue = getProperty(descriptives, name);
             if (descriptivesValue != null) {
                 TestUtils.assertEquals("descriptive value for " + name + " is incorrect.",
                                        descriptivesValue.doubleValue(), expectedValue.doubleValue(),
                                        getMaximumAbsoluteError());
             }
         }
     }
 
 
     protected Double getProperty(Object bean, String name) {
         try {
             // Get the value of prop
             String prop = "get" + name.substring(0,1).toUpperCase() + name.substring(1);
             Method meth = bean.getClass().getMethod(prop);
             Object property = meth.invoke(bean);
             if (meth.getReturnType().equals(Double.TYPE)) {
                 return (Double) property;
             } else if (meth.getReturnType().equals(Long.TYPE)) {
                 return Double.valueOf(((Long) property).doubleValue());
             } else {
                 Assert.fail("wrong type: " + meth.getReturnType().getName());
             }
         } catch (NoSuchMethodException nsme) {
             // ignored
         } catch (InvocationTargetException ite) {
             Assert.fail(ite.getMessage());
         } catch (IllegalAccessException iae) {
             Assert.fail(iae.getMessage());
         }
         return null;
     }
 }