/*
    * 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
    *
    *      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.
   */
  
  /*
   * This is not the original file distributed by the Apache Software Foundation
   * It has been modified by the Hipparchus project
   */
  package org.hipparchus.stat;
  
  import org.hipparchus.stat.descriptive.DescriptiveStatistics;
  import org.hipparchus.stat.descriptive.StreamingStatistics;
  import org.junit.jupiter.api.Test;
  
  import java.io.BufferedReader;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  
  /**
   * Certified data test cases.
   */
  class CertifiedDataTest {
  
      protected double mean = Double.NaN;
  
      protected double std = Double.NaN;
  
      /**
       * Test SummaryStatistics - implementations that do not store the data
       * and use single pass algorithms to compute statistics
      */
      @Test
      void testSummaryStatistics() throws Exception {
          StreamingStatistics u = new StreamingStatistics();
          loadStats("data/PiDigits.txt", u);
          assertEquals(std, u.getStandardDeviation(), 1E-13, "PiDigits: std");
          assertEquals(mean, u.getMean(), 1E-13, "PiDigits: mean");
  
          loadStats("data/Mavro.txt", u);
          assertEquals(std, u.getStandardDeviation(), 1E-14, "Mavro: std");
          assertEquals(mean, u.getMean(), 1E-14, "Mavro: mean");
  
          loadStats("data/Michelso.txt", u);
          assertEquals(std, u.getStandardDeviation(), 1E-13, "Michelso: std");
          assertEquals(mean, u.getMean(), 1E-13, "Michelso: mean");
  
          loadStats("data/NumAcc1.txt", u);
          assertEquals(std, u.getStandardDeviation(), 1E-14, "NumAcc1: std");
          assertEquals(mean, u.getMean(), 1E-14, "NumAcc1: mean");
  
          loadStats("data/NumAcc2.txt", u);
          assertEquals(std, u.getStandardDeviation(), 1E-14, "NumAcc2: std");
          assertEquals(mean, u.getMean(), 1E-14, "NumAcc2: mean");
      }
  
      /**
       * Test DescriptiveStatistics - implementations that store full array of
       * values and execute multi-pass algorithms
       */
      @Test
      void testDescriptiveStatistics() throws Exception {
  
          DescriptiveStatistics u = new DescriptiveStatistics();
  
          loadStats("data/PiDigits.txt", u);
          assertEquals(std, u.getStandardDeviation(), 1E-14, "PiDigits: std");
          assertEquals(mean, u.getMean(), 1E-14, "PiDigits: mean");
  
          loadStats("data/Mavro.txt", u);
          assertEquals(std, u.getStandardDeviation(), 1E-14, "Mavro: std");
          assertEquals(mean, u.getMean(), 1E-14, "Mavro: mean");
  
          loadStats("data/Michelso.txt", u);
          assertEquals(std, u.getStandardDeviation(), 1E-14, "Michelso: std");
          assertEquals(mean, u.getMean(), 1E-14, "Michelso: mean");
  
          loadStats("data/NumAcc1.txt", u);
          assertEquals(std, u.getStandardDeviation(), 1E-14, "NumAcc1: std");
          assertEquals(mean, u.getMean(), 1E-14, "NumAcc1: mean");
  
          loadStats("data/NumAcc2.txt", u);
          assertEquals(std, u.getStandardDeviation(), 1E-14, "NumAcc2: std");
          assertEquals(mean, u.getMean(), 1E-14, "NumAcc2: mean");
     }
 
     /**
      * loads a DescriptiveStatistics off of a test file
      */
     private void loadStats(String resource, Object u) throws Exception {
 
         DescriptiveStatistics d = null;
         StreamingStatistics s = null;
         if (u instanceof DescriptiveStatistics) {
             d = (DescriptiveStatistics) u;
             d.clear();
         } else {
             s = (StreamingStatistics) u;
             s.clear();
         }
 
         mean = Double.NaN;
         std = Double.NaN;
 
         InputStream resourceAsStream = CertifiedDataTest.class.getResourceAsStream(resource);
         assertNotNull(resourceAsStream,"Could not find resource "+resource);
         BufferedReader in =
             new BufferedReader(
                     new InputStreamReader(
                             resourceAsStream));
 
         String line = null;
 
         for (int j = 0; j < 60; j++) {
             line = in.readLine();
             if (j == 40) {
                 mean =
                     Double.parseDouble(
                             line.substring(line.lastIndexOf(":") + 1).trim());
             }
             if (j == 41) {
                 std =
                     Double.parseDouble(
                             line.substring(line.lastIndexOf(":") + 1).trim());
             }
         }
 
         line = in.readLine();
 
         while (line != null) {
             if (d != null) {
                 d.addValue(Double.parseDouble(line.trim()));
             }  else {
                 s.addValue(Double.parseDouble(line.trim()));
             }
             line = in.readLine();
         }
 
         resourceAsStream.close();
         in.close();
     }
 }