/*
    * 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.fraction;
  
  import org.hipparchus.exception.MathIllegalStateException;
  import org.hipparchus.util.FastMath;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  import java.util.Locale;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  import static org.junit.jupiter.api.Assertions.fail;
  
  
  class FractionFormatTest {
  
      FractionFormat properFormat = null;
      FractionFormat improperFormat = null;
  
      protected Locale getLocale() {
          return Locale.getDefault();
      }
  
      @BeforeEach
      void setUp() {
          properFormat = FractionFormat.getProperInstance(getLocale());
          improperFormat = FractionFormat.getImproperInstance(getLocale());
      }
  
      @Test
      void testFormat() {
          Fraction c = new Fraction(1, 2);
          String expected = "1 / 2";
  
          String actual = properFormat.format(c);
          assertEquals(expected, actual);
  
          actual = improperFormat.format(c);
          assertEquals(expected, actual);
      }
  
      @Test
      void testFormatNegative() {
          Fraction c = new Fraction(-1, 2);
          String expected = "-1 / 2";
  
          String actual = properFormat.format(c);
          assertEquals(expected, actual);
  
          actual = improperFormat.format(c);
          assertEquals(expected, actual);
      }
  
      @Test
      void testFormatZero() {
          Fraction c = new Fraction(0, 1);
          String expected = "0 / 1";
  
          String actual = properFormat.format(c);
          assertEquals(expected, actual);
  
          actual = improperFormat.format(c);
          assertEquals(expected, actual);
      }
  
      @Test
      void testFormatImproper() {
          Fraction c = new Fraction(5, 3);
  
          String actual = properFormat.format(c);
          assertEquals("1 2 / 3", actual);
  
          actual = improperFormat.format(c);
          assertEquals("5 / 3", actual);
      }
  
      @Test
     void testFormatImproperNegative() {
         Fraction c = new Fraction(-5, 3);
 
         String actual = properFormat.format(c);
         assertEquals("-1 2 / 3", actual);
 
         actual = improperFormat.format(c);
         assertEquals("-5 / 3", actual);
     }
 
     @Test
     void testParse() {
         String source = "1 / 2";
 
         try {
             Fraction c = properFormat.parse(source);
             assertNotNull(c);
             assertEquals(1, c.getNumerator());
             assertEquals(2, c.getDenominator());
 
             c = improperFormat.parse(source);
             assertNotNull(c);
             assertEquals(1, c.getNumerator());
             assertEquals(2, c.getDenominator());
         } catch (MathIllegalStateException ex) {
             fail(ex.getMessage());
         }
     }
 
     @Test
     void testParseInteger() {
         String source = "10";
         {
             Fraction c = properFormat.parse(source);
             assertNotNull(c);
             assertEquals(10, c.getNumerator());
             assertEquals(1, c.getDenominator());
         }
         {
             Fraction c = improperFormat.parse(source);
             assertNotNull(c);
             assertEquals(10, c.getNumerator());
             assertEquals(1, c.getDenominator());
         }
     }
 
     @Test
     void testParseOne1() {
         String source = "1 / 1";
         Fraction c = properFormat.parse(source);
         assertNotNull(c);
         assertEquals(1, c.getNumerator());
         assertEquals(1, c.getDenominator());
     }
 
     @Test
     void testParseOne2() {
         String source = "10 / 10";
         Fraction c = properFormat.parse(source);
         assertNotNull(c);
         assertEquals(1, c.getNumerator());
         assertEquals(1, c.getDenominator());
     }
 
     @Test
     void testParseZero1() {
         String source = "0 / 1";
         Fraction c = properFormat.parse(source);
         assertNotNull(c);
         assertEquals(0, c.getNumerator());
         assertEquals(1, c.getDenominator());
     }
 
     @Test
     void testParseZero2() {
         String source = "-0 / 1";
         Fraction c = properFormat.parse(source);
         assertNotNull(c);
         assertEquals(0, c.getNumerator());
         assertEquals(1, c.getDenominator());
         // This test shows that the sign is not preserved.
         assertEquals(Double.POSITIVE_INFINITY, 1d / c.doubleValue(), 0);
     }
 
     @Test
     void testParseInvalid() {
         String source = "a";
         String msg = "should not be able to parse '10 / a'.";
         try {
             properFormat.parse(source);
             fail(msg);
         } catch (MathIllegalStateException ex) {
             // success
         }
         try {
             improperFormat.parse(source);
             fail(msg);
         } catch (MathIllegalStateException ex) {
             // success
         }
     }
 
     @Test
     void testParseInvalidDenominator() {
         String source = "10 / a";
         String msg = "should not be able to parse '10 / a'.";
         try {
             properFormat.parse(source);
             fail(msg);
         } catch (MathIllegalStateException ex) {
             // success
         }
         try {
             improperFormat.parse(source);
             fail(msg);
         } catch (MathIllegalStateException ex) {
             // success
         }
     }
 
     @Test
     void testParseNegative() {
 
         {
             String source = "-1 / 2";
             Fraction c = properFormat.parse(source);
             assertNotNull(c);
             assertEquals(-1, c.getNumerator());
             assertEquals(2, c.getDenominator());
 
             c = improperFormat.parse(source);
             assertNotNull(c);
             assertEquals(-1, c.getNumerator());
             assertEquals(2, c.getDenominator());
 
             source = "1 / -2";
             c = properFormat.parse(source);
             assertNotNull(c);
             assertEquals(-1, c.getNumerator());
             assertEquals(2, c.getDenominator());
 
             c = improperFormat.parse(source);
             assertNotNull(c);
             assertEquals(-1, c.getNumerator());
             assertEquals(2, c.getDenominator());
         }
     }
 
     @Test
     void testParseProper() {
         String source = "1 2 / 3";
 
         {
             Fraction c = properFormat.parse(source);
             assertNotNull(c);
             assertEquals(5, c.getNumerator());
             assertEquals(3, c.getDenominator());
         }
 
         try {
             improperFormat.parse(source);
             fail("invalid improper fraction.");
         } catch (MathIllegalStateException ex) {
             // success
         }
     }
 
     @Test
     void testParseProperNegative() {
         String source = "-1 2 / 3";
         {
             Fraction c = properFormat.parse(source);
             assertNotNull(c);
             assertEquals(-5, c.getNumerator());
             assertEquals(3, c.getDenominator());
         }
 
         try {
             improperFormat.parse(source);
             fail("invalid improper fraction.");
         } catch (MathIllegalStateException ex) {
             // success
         }
     }
 
     @Test
     void testParseProperInvalidMinus() {
         String source = "2 -2 / 3";
         try {
             properFormat.parse(source);
             fail("invalid minus in improper fraction.");
         } catch (MathIllegalStateException ex) {
             // expected
         }
         source = "2 2 / -3";
         try {
             properFormat.parse(source);
             fail("invalid minus in improper fraction.");
         } catch (MathIllegalStateException ex) {
             // expected
         }
     }
 
     @Test
     void testLongFormat() {
         assertEquals("10 / 1", improperFormat.format(10l));
     }
 
     @Test
     void testDoubleFormat() {
         assertEquals("355 / 113", improperFormat.format(FastMath.PI));
     }
 }