/*
    * Copyright (C) 2008 The Guava 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 com.google.common.primitives;
  
  import static com.google.common.truth.Truth.assertThat;
  import static java.lang.Double.NaN;
  
  import com.google.common.annotations.GwtCompatible;
  import com.google.common.annotations.GwtIncompatible;
  import com.google.common.base.Converter;
  import com.google.common.collect.ImmutableList;
  import com.google.common.collect.testing.Helpers;
  import com.google.common.testing.NullPointerTester;
  import com.google.common.testing.SerializableTester;
  
  import junit.framework.TestCase;
  
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.Comparator;
  import java.util.List;
  
  /**
   * Unit test for {@link Doubles}.
   *
   * @author Kevin Bourrillion
   */
  @GwtCompatible(emulated = true)
  @SuppressWarnings("cast") // redundant casts are intentional and harmless
  public class DoublesTest extends TestCase {
    private static final double[] EMPTY = {};
    private static final double[] ARRAY1 = {(double) 1};
    private static final double[] ARRAY234
        = {(double) 2, (double) 3, (double) 4};
  
    private static final double LEAST = Double.NEGATIVE_INFINITY;
    private static final double GREATEST = Double.POSITIVE_INFINITY;
  
    private static final double[] NUMBERS = new double[] {
        LEAST, -Double.MAX_VALUE, -1.0, -0.5, -0.1, -0.0, 0.0, 0.1, 0.5, 1.0,
        Double.MAX_VALUE, GREATEST, Double.MIN_NORMAL, -Double.MIN_NORMAL,
        Double.MIN_VALUE, -Double.MIN_VALUE, Integer.MIN_VALUE,
        Integer.MAX_VALUE, Long.MIN_VALUE, Long.MAX_VALUE
    };
  
    private static final double[] VALUES
        = Doubles.concat(NUMBERS, new double[] {NaN});
  
    public void testHashCode() {
      for (double value : VALUES) {
        assertEquals(((Double) value).hashCode(), Doubles.hashCode(value));
      }
    }
  
    public void testIsFinite() {
      for (double value : NUMBERS) {
        assertEquals(!(Double.isNaN(value) || Double.isInfinite(value)), Doubles.isFinite(value));
      }
    }
  
    public void testCompare() {
      for (double x : VALUES) {
        for (double y : VALUES) {
          // note: spec requires only that the sign is the same
          assertEquals(x + ", " + y,
                       Double.valueOf(x).compareTo(y),
                       Doubles.compare(x, y));
        }
      }
    }
  
    public void testContains() {
      assertFalse(Doubles.contains(EMPTY, (double) 1));
      assertFalse(Doubles.contains(ARRAY1, (double) 2));
      assertFalse(Doubles.contains(ARRAY234, (double) 1));
      assertTrue(Doubles.contains(new double[] {(double) -1}, (double) -1));
      assertTrue(Doubles.contains(ARRAY234, (double) 2));
      assertTrue(Doubles.contains(ARRAY234, (double) 3));
      assertTrue(Doubles.contains(ARRAY234, (double) 4));
  
      for (double value : NUMBERS) {
        assertTrue("" + value,
            Doubles.contains(new double[] {5.0, value}, value));
      }
     assertFalse(Doubles.contains(new double[] {5.0, NaN}, NaN));
   }
 
   public void testIndexOf() {
     assertEquals(-1, Doubles.indexOf(EMPTY, (double) 1));
     assertEquals(-1, Doubles.indexOf(ARRAY1, (double) 2));
     assertEquals(-1, Doubles.indexOf(ARRAY234, (double) 1));
     assertEquals(0, Doubles.indexOf(
         new double[] {(double) -1}, (double) -1));
     assertEquals(0, Doubles.indexOf(ARRAY234, (double) 2));
     assertEquals(1, Doubles.indexOf(ARRAY234, (double) 3));
     assertEquals(2, Doubles.indexOf(ARRAY234, (double) 4));
     assertEquals(1, Doubles.indexOf(
         new double[] { (double) 2, (double) 3, (double) 2, (double) 3 },
         (double) 3));
 
     for (double value : NUMBERS) {
       assertEquals("" + value,
           1, Doubles.indexOf(new double[] {5.0, value}, value));
     }
     assertEquals(-1, Doubles.indexOf(new double[] {5.0, NaN}, NaN));
   }
 
   public void testIndexOf_arrayTarget() {
     assertEquals(0, Doubles.indexOf(EMPTY, EMPTY));
     assertEquals(0, Doubles.indexOf(ARRAY234, EMPTY));
     assertEquals(-1, Doubles.indexOf(EMPTY, ARRAY234));
     assertEquals(-1, Doubles.indexOf(ARRAY234, ARRAY1));
     assertEquals(-1, Doubles.indexOf(ARRAY1, ARRAY234));
     assertEquals(0, Doubles.indexOf(ARRAY1, ARRAY1));
     assertEquals(0, Doubles.indexOf(ARRAY234, ARRAY234));
     assertEquals(0, Doubles.indexOf(
         ARRAY234, new double[] { (double) 2, (double) 3 }));
     assertEquals(1, Doubles.indexOf(
         ARRAY234, new double[] { (double) 3, (double) 4 }));
     assertEquals(1, Doubles.indexOf(ARRAY234, new double[] { (double) 3 }));
     assertEquals(2, Doubles.indexOf(ARRAY234, new double[] { (double) 4 }));
     assertEquals(1, Doubles.indexOf(new double[] { (double) 2, (double) 3,
         (double) 3, (double) 3, (double) 3 },
         new double[] { (double) 3 }
     ));
     assertEquals(2, Doubles.indexOf(
         new double[] { (double) 2, (double) 3, (double) 2,
             (double) 3, (double) 4, (double) 2, (double) 3},
         new double[] { (double) 2, (double) 3, (double) 4}
     ));
     assertEquals(1, Doubles.indexOf(
         new double[] { (double) 2, (double) 2, (double) 3,
             (double) 4, (double) 2, (double) 3, (double) 4},
         new double[] { (double) 2, (double) 3, (double) 4}
     ));
     assertEquals(-1, Doubles.indexOf(
         new double[] { (double) 4, (double) 3, (double) 2},
         new double[] { (double) 2, (double) 3, (double) 4}
     ));
 
     for (double value : NUMBERS) {
       assertEquals("" + value, 1, Doubles.indexOf(
           new double[] {5.0, value, value, 5.0}, new double[] {value, value}));
     }
     assertEquals(-1, Doubles.indexOf(
         new double[] {5.0, NaN, NaN, 5.0}, new double[] {NaN, NaN}));
   }
 
   public void testLastIndexOf() {
     assertEquals(-1, Doubles.lastIndexOf(EMPTY, (double) 1));
     assertEquals(-1, Doubles.lastIndexOf(ARRAY1, (double) 2));
     assertEquals(-1, Doubles.lastIndexOf(ARRAY234, (double) 1));
     assertEquals(0, Doubles.lastIndexOf(
         new double[] {(double) -1}, (double) -1));
     assertEquals(0, Doubles.lastIndexOf(ARRAY234, (double) 2));
     assertEquals(1, Doubles.lastIndexOf(ARRAY234, (double) 3));
     assertEquals(2, Doubles.lastIndexOf(ARRAY234, (double) 4));
     assertEquals(3, Doubles.lastIndexOf(
         new double[] { (double) 2, (double) 3, (double) 2, (double) 3 },
         (double) 3));
 
     for (double value : NUMBERS) {
       assertEquals("" + value,
           0, Doubles.lastIndexOf(new double[] {value, 5.0}, value));
     }
     assertEquals(-1, Doubles.lastIndexOf(new double[] {NaN, 5.0}, NaN));
   }
 
   public void testMax_noArgs() {
     try {
       Doubles.max();
       fail();
     } catch (IllegalArgumentException expected) {
     }
   }
 
   public void testMax() {
     assertEquals(LEAST, Doubles.max(LEAST));
     assertEquals(GREATEST, Doubles.max(GREATEST));
     assertEquals((double) 9, Doubles.max(
         (double) 8, (double) 6, (double) 7,
         (double) 5, (double) 3, (double) 0, (double) 9));
 
     assertEquals(0.0, Doubles.max(-0.0, 0.0));
     assertEquals(0.0, Doubles.max(0.0, -0.0));
     assertEquals(GREATEST, Doubles.max(NUMBERS));
     assertTrue(Double.isNaN(Doubles.max(VALUES)));
   }
 
   public void testMin_noArgs() {
     try {
       Doubles.min();
       fail();
     } catch (IllegalArgumentException expected) {
     }
   }
 
   public void testMin() {
     assertEquals(LEAST, Doubles.min(LEAST));
     assertEquals(GREATEST, Doubles.min(GREATEST));
     assertEquals((double) 0, Doubles.min(
         (double) 8, (double) 6, (double) 7,
         (double) 5, (double) 3, (double) 0, (double) 9));
 
     assertEquals(-0.0, Doubles.min(-0.0, 0.0));
     assertEquals(-0.0, Doubles.min(0.0, -0.0));
     assertEquals(LEAST, Doubles.min(NUMBERS));
     assertTrue(Double.isNaN(Doubles.min(VALUES)));
   }
 
   public void testConcat() {
     assertTrue(Arrays.equals(EMPTY, Doubles.concat()));
     assertTrue(Arrays.equals(EMPTY, Doubles.concat(EMPTY)));
     assertTrue(Arrays.equals(EMPTY, Doubles.concat(EMPTY, EMPTY, EMPTY)));
     assertTrue(Arrays.equals(ARRAY1, Doubles.concat(ARRAY1)));
     assertNotSame(ARRAY1, Doubles.concat(ARRAY1));
     assertTrue(Arrays.equals(ARRAY1, Doubles.concat(EMPTY, ARRAY1, EMPTY)));
     assertTrue(Arrays.equals(
         new double[] {(double) 1, (double) 1, (double) 1},
         Doubles.concat(ARRAY1, ARRAY1, ARRAY1)));
     assertTrue(Arrays.equals(
         new double[] {(double) 1, (double) 2, (double) 3, (double) 4},
         Doubles.concat(ARRAY1, ARRAY234)));
   }
 
   public void testEnsureCapacity() {
     assertSame(EMPTY, Doubles.ensureCapacity(EMPTY, 0, 1));
     assertSame(ARRAY1, Doubles.ensureCapacity(ARRAY1, 0, 1));
     assertSame(ARRAY1, Doubles.ensureCapacity(ARRAY1, 1, 1));
     assertTrue(Arrays.equals(
         new double[] {(double) 1, (double) 0, (double) 0},
         Doubles.ensureCapacity(ARRAY1, 2, 1)));
   }
 
   public void testEnsureCapacity_fail() {
     try {
       Doubles.ensureCapacity(ARRAY1, -1, 1);
       fail();
     } catch (IllegalArgumentException expected) {
     }
     try {
       // notice that this should even fail when no growth was needed
       Doubles.ensureCapacity(ARRAY1, 1, -1);
       fail();
     } catch (IllegalArgumentException expected) {
     }
   }
 
   @GwtIncompatible("Double.toString returns different value in GWT.")
   public void testJoin() {
     assertEquals("", Doubles.join(",", EMPTY));
     assertEquals("1.0", Doubles.join(",", ARRAY1));
     assertEquals("1.0,2.0", Doubles.join(",", (double) 1, (double) 2));
     assertEquals("1.02.03.0",
         Doubles.join("", (double) 1, (double) 2, (double) 3));
   }
 
   public void testJoinNonTrivialDoubles() {
     assertEquals("", Doubles.join(",", EMPTY));
     assertEquals("1.2", Doubles.join(",", 1.2));
     assertEquals("1.3,2.4", Doubles.join(",", 1.3, 2.4));
     assertEquals("1.42.53.6", Doubles.join("", 1.4, 2.5, 3.6));
   }
 
   public void testLexicographicalComparator() {
     List<double[]> ordered = Arrays.asList(
         new double[] {},
         new double[] {LEAST},
         new double[] {LEAST, LEAST},
         new double[] {LEAST, (double) 1},
         new double[] {(double) 1},
         new double[] {(double) 1, LEAST},
         new double[] {GREATEST, Double.MAX_VALUE},
         new double[] {GREATEST, GREATEST},
         new double[] {GREATEST, GREATEST, GREATEST});
 
     Comparator<double[]> comparator = Doubles.lexicographicalComparator();
     Helpers.testComparator(comparator, ordered);
   }
 
   @GwtIncompatible("SerializableTester")
   public void testLexicographicalComparatorSerializable() {
     Comparator<double[]> comparator = Doubles.lexicographicalComparator();
     assertSame(comparator, SerializableTester.reserialize(comparator));
   }
 
   @GwtIncompatible("SerializableTester")
   public void testStringConverterSerialization() {
     SerializableTester.reserializeAndAssert(Doubles.stringConverter());
   }
 
   public void testToArray() {
     // need explicit type parameter to avoid javac warning!?
     List<Double> none = Arrays.<Double>asList();
     assertTrue(Arrays.equals(EMPTY, Doubles.toArray(none)));
 
     List<Double> one = Arrays.asList((double) 1);
     assertTrue(Arrays.equals(ARRAY1, Doubles.toArray(one)));
 
     double[] array = {(double) 0, (double) 1, Math.PI};
 
     List<Double> three = Arrays.asList((double) 0, (double) 1, Math.PI);
     assertTrue(Arrays.equals(array, Doubles.toArray(three)));
 
     assertTrue(Arrays.equals(array, Doubles.toArray(Doubles.asList(array))));
   }
 
   public void testToArray_threadSafe() {
     for (int delta : new int[] { +1, 0, -1 }) {
       for (int i = 0; i < VALUES.length; i++) {
         List<Double> list = Doubles.asList(VALUES).subList(0, i);
         Collection<Double> misleadingSize =
             Helpers.misleadingSizeCollection(delta);
         misleadingSize.addAll(list);
         double[] arr = Doubles.toArray(misleadingSize);
         assertEquals(i, arr.length);
         for (int j = 0; j < i; j++) {
           assertEquals(VALUES[j], arr[j]);
         }
       }
     }
   }
 
   public void testToArray_withNull() {
     List<Double> list = Arrays.asList((double) 0, (double) 1, null);
     try {
       Doubles.toArray(list);
       fail();
     } catch (NullPointerException expected) {
     }
   }
 
   public void testToArray_withConversion() {
     double[] array = {(double) 0, (double) 1, (double) 2};
 
     List<Byte> bytes = Arrays.asList((byte) 0, (byte) 1, (byte) 2);
     List<Short> shorts = Arrays.asList((short) 0, (short) 1, (short) 2);
     List<Integer> ints = Arrays.asList(0, 1, 2);
     List<Float> floats = Arrays.asList((float) 0, (float) 1, (float) 2);
     List<Long> longs = Arrays.asList((long) 0, (long) 1, (long) 2);
     List<Double> doubles = Arrays.asList((double) 0, (double) 1, (double) 2);
 
     assertTrue(Arrays.equals(array, Doubles.toArray(bytes)));
     assertTrue(Arrays.equals(array, Doubles.toArray(shorts)));
     assertTrue(Arrays.equals(array, Doubles.toArray(ints)));
     assertTrue(Arrays.equals(array, Doubles.toArray(floats)));
     assertTrue(Arrays.equals(array, Doubles.toArray(longs)));
     assertTrue(Arrays.equals(array, Doubles.toArray(doubles)));
   }
 
   public void testAsList_isAView() {
     double[] array = {(double) 0, (double) 1};
     List<Double> list = Doubles.asList(array);
     list.set(0, (double) 2);
     assertTrue(Arrays.equals(new double[] {(double) 2, (double) 1}, array));
     array[1] = (double) 3;
     assertThat(list).has().exactly((double) 2, (double) 3).inOrder();
   }
 
   public void testAsList_toArray_roundTrip() {
     double[] array = { (double) 0, (double) 1, (double) 2 };
     List<Double> list = Doubles.asList(array);
     double[] newArray = Doubles.toArray(list);
 
     // Make sure it returned a copy
     list.set(0, (double) 4);
     assertTrue(Arrays.equals(
         new double[] { (double) 0, (double) 1, (double) 2 }, newArray));
     newArray[1] = (double) 5;
     assertEquals((double) 1, (double) list.get(1));
   }
 
   // This test stems from a real bug found by andrewk
   public void testAsList_subList_toArray_roundTrip() {
     double[] array = { (double) 0, (double) 1, (double) 2, (double) 3 };
     List<Double> list = Doubles.asList(array);
     assertTrue(Arrays.equals(new double[] { (double) 1, (double) 2 },
         Doubles.toArray(list.subList(1, 3))));
     assertTrue(Arrays.equals(new double[] {},
         Doubles.toArray(list.subList(2, 2))));
   }
 
   public void testAsListEmpty() {
     assertSame(Collections.emptyList(), Doubles.asList(EMPTY));
   }
 
   /**
    * A reference implementation for {@code tryParse} that just catches the exception from
    * {@link Double#valueOf}.
    */
   private static Double referenceTryParse(String input) {
     if (input.trim().length() < input.length()) {
       return null;
     }
     try {
       return Double.valueOf(input);
     } catch (NumberFormatException e) {
       return null;
     }
   }
 
   @GwtIncompatible("Doubles.tryParse")
   private static void checkTryParse(String input) {
     Double expected = referenceTryParse(input);
     assertEquals(expected, Doubles.tryParse(input));
     assertEquals(expected != null,
         Doubles.FLOATING_POINT_PATTERN.matcher(input).matches());
   }
 
   @GwtIncompatible("Doubles.tryParse")
   private static void checkTryParse(double expected, String input) {
     assertEquals(Double.valueOf(expected), Doubles.tryParse(input));
     assertTrue(Doubles.FLOATING_POINT_PATTERN.matcher(input).matches());
   }
 
   @GwtIncompatible("Doubles.tryParse")
   public void testTryParseHex() {
     for (String signChar : ImmutableList.of("", "+", "-")) {
       for (String hexPrefix : ImmutableList.of("0x", "0X")) {
         for (String iPart : ImmutableList.of("", "0", "1", "F", "f", "c4", "CE")) {
           for (String fPart : ImmutableList.of("", ".", ".F", ".52", ".a")) {
             for (String expMarker : ImmutableList.of("p", "P")) {
               for (String exponent : ImmutableList.of("0", "-5", "+20", "52")) {
                 for (String typePart : ImmutableList.of("", "D", "F", "d", "f")) {
                   checkTryParse(
                       signChar + hexPrefix + iPart + fPart + expMarker + exponent + typePart);
                 }
               }
             }
           }
         }
       }
     }
   }
 
   @GwtIncompatible("Doubles.tryParse")
   public void testTryParseAllCodePoints() {
     // Exercise non-ASCII digit test cases and the like.
     char[] tmp = new char[2];
     for (int i = Character.MIN_CODE_POINT; i < Character.MAX_CODE_POINT; i++) {
       Character.toChars(i, tmp, 0);
       checkTryParse(String.copyValueOf(tmp, 0, Character.charCount(i)));
     }
   }
 
   @GwtIncompatible("Doubles.tryParse")
   public void testTryParseOfToStringIsOriginal() {
     for (double d : NUMBERS) {
       checkTryParse(d, Double.toString(d));
     }
   }
 
   @GwtIncompatible("Doubles.tryParse")
   public void testTryParseOfToHexStringIsOriginal() {
     for (double d : NUMBERS) {
       checkTryParse(d, Double.toHexString(d));
     }
   }
 
   @GwtIncompatible("Doubles.tryParse")
   public void testTryParseNaN() {
     checkTryParse("NaN");
     checkTryParse("+NaN");
     checkTryParse("-NaN");
   }
 
   @GwtIncompatible("Doubles.tryParse")
   public void testTryParseInfinity() {
     checkTryParse(Double.POSITIVE_INFINITY, "Infinity");
     checkTryParse(Double.POSITIVE_INFINITY, "+Infinity");
     checkTryParse(Double.NEGATIVE_INFINITY, "-Infinity");
   }
 
   private static final String[] BAD_TRY_PARSE_INPUTS =
     { "", "+-", "+-0", " 5", "32 ", " 55 ", "infinity", "POSITIVE_INFINITY", "0x9A", "0x9A.bE-5",
       ".", ".e5", "NaNd", "InfinityF" };
 
   @GwtIncompatible("Doubles.tryParse")
   public void testTryParseFailures() {
     for (String badInput : BAD_TRY_PARSE_INPUTS) {
       assertFalse(Doubles.FLOATING_POINT_PATTERN.matcher(badInput).matches());
       assertEquals(referenceTryParse(badInput), Doubles.tryParse(badInput));
       assertNull(Doubles.tryParse(badInput));
     }
   }
 
   @GwtIncompatible("NullPointerTester")
   public void testNulls() {
     new NullPointerTester().testAllPublicStaticMethods(Doubles.class);
   }
 
   public void testStringConverter_convert() {
     Converter<String, Double> converter = Doubles.stringConverter();
     assertEquals((Double) 1.0, converter.convert("1.0"));
     assertEquals((Double) 0.0, converter.convert("0.0"));
     assertEquals((Double) (-1.0), converter.convert("-1.0"));
     assertEquals((Double) 1.0, converter.convert("1"));
     assertEquals((Double) 0.0, converter.convert("0"));
     assertEquals((Double) (-1.0), converter.convert("-1"));
     assertEquals((Double) 1e6, converter.convert("1e6"));
     assertEquals((Double) 1e-6, converter.convert("1e-6"));
   }
 
   public void testStringConverter_convertError() {
     try {
       Doubles.stringConverter().convert("notanumber");
       fail();
     } catch (NumberFormatException expected) {
     }
   }
 
   public void testStringConverter_nullConversions() {
     assertNull(Doubles.stringConverter().convert(null));
     assertNull(Doubles.stringConverter().reverse().convert(null));
   }
 
   @GwtIncompatible("Double.toString returns different value in GWT.")
   public void testStringConverter_reverse() {
     Converter<String, Double> converter = Doubles.stringConverter();
     assertEquals("1.0", converter.reverse().convert(1.0));
     assertEquals("0.0", converter.reverse().convert(0.0));
     assertEquals("-1.0", converter.reverse().convert(-1.0));
     assertEquals("1000000.0", converter.reverse().convert(1e6));
     assertEquals("1.0E-6", converter.reverse().convert(1e-6));
   }
 
   @GwtIncompatible("NullPointerTester")
   public void testStringConverter_nullPointerTester() throws Exception {
     NullPointerTester tester = new NullPointerTester();
     tester.testAllPublicInstanceMethods(Doubles.stringConverter());
   }
 }