/*
    * 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 com.google.common.annotations.GwtCompatible;
  import com.google.common.collect.testing.Helpers;
  
  import junit.framework.TestCase;
  
  import java.util.Arrays;
  import java.util.Comparator;
  import java.util.List;
  
  /**
   * Unit test for {@link SignedBytes}.
   *
   * @author Kevin Bourrillion
   */
  @GwtCompatible(emulated = true)
  @SuppressWarnings("cast") // redundant casts are intentional and harmless
  public class SignedBytesTest extends TestCase {
    private static final byte[] EMPTY = {};
    private static final byte[] ARRAY1 = {(byte) 1};
  
    private static final byte LEAST = Byte.MIN_VALUE;
    private static final byte GREATEST = Byte.MAX_VALUE;
  
    private static final byte[] VALUES =
        {LEAST, -1, 0, 1, GREATEST};
  
    public void testCheckedCast() {
      for (byte value : VALUES) {
        assertEquals(value, SignedBytes.checkedCast((long) value));
      }
      assertCastFails(GREATEST + 1L);
      assertCastFails(LEAST - 1L);
      assertCastFails(Long.MAX_VALUE);
      assertCastFails(Long.MIN_VALUE);
    }
  
    public void testSaturatedCast() {
      for (byte value : VALUES) {
        assertEquals(value, SignedBytes.saturatedCast((long) value));
      }
      assertEquals(GREATEST, SignedBytes.saturatedCast(GREATEST + 1L));
      assertEquals(LEAST, SignedBytes.saturatedCast(LEAST - 1L));
      assertEquals(GREATEST, SignedBytes.saturatedCast(Long.MAX_VALUE));
      assertEquals(LEAST, SignedBytes.saturatedCast(Long.MIN_VALUE));
    }
  
    private static void assertCastFails(long value) {
      try {
        SignedBytes.checkedCast(value);
        fail("Cast to byte should have failed: " + value);
      } catch (IllegalArgumentException ex) {
        assertTrue(value + " not found in exception text: " + ex.getMessage(),
            ex.getMessage().contains(String.valueOf(value)));
      }
    }
  
    public void testCompare() {
      for (byte x : VALUES) {
        for (byte y : VALUES) {
          // Only compare the sign of the result of compareTo().
          int expected = Byte.valueOf(x).compareTo(y);
          int actual = SignedBytes.compare(x, y);
          if (expected == 0) {
            assertEquals(x + ", " + y, expected, actual);
          } else if (expected < 0) {
            assertTrue(x + ", " + y + " (expected: " + expected + ", actual" + actual + ")",
                actual < 0);
          } else {
            assertTrue(x + ", " + y + " (expected: " + expected + ", actual" + actual + ")",
                actual > 0);
          }
        }
      }
    }
  
    public void testMax_noArgs() {
      try {
        SignedBytes.max();
        fail();
      } catch (IllegalArgumentException expected) {
      }
   }
 
   public void testMax() {
     assertEquals(LEAST, SignedBytes.max(LEAST));
     assertEquals(GREATEST, SignedBytes.max(GREATEST));
     assertEquals((byte) 127, SignedBytes.max(
         (byte) 0, (byte) -128, (byte) -1, (byte) 127, (byte) 1));
   }
 
   public void testMin_noArgs() {
     try {
       SignedBytes.min();
       fail();
     } catch (IllegalArgumentException expected) {
     }
   }
 
   public void testMin() {
     assertEquals(LEAST, SignedBytes.min(LEAST));
     assertEquals(GREATEST, SignedBytes.min(GREATEST));
     assertEquals((byte) -128, SignedBytes.min(
         (byte) 0, (byte) -128, (byte) -1, (byte) 127, (byte) 1));
   }
 
   public void testJoin() {
     assertEquals("", SignedBytes.join(",", EMPTY));
     assertEquals("1", SignedBytes.join(",", ARRAY1));
     assertEquals("1,2", SignedBytes.join(",", (byte) 1, (byte) 2));
     assertEquals("123", SignedBytes.join("", (byte) 1, (byte) 2, (byte) 3));
     assertEquals("-128,-1", SignedBytes.join(",", (byte) -128, (byte) -1));
   }
 
   public void testLexicographicalComparator() {
     List<byte[]> ordered = Arrays.asList(
         new byte[] {},
         new byte[] {LEAST},
         new byte[] {LEAST, LEAST},
         new byte[] {LEAST, (byte) 1},
         new byte[] {(byte) 1},
         new byte[] {(byte) 1, LEAST},
         new byte[] {GREATEST, GREATEST - (byte) 1},
         new byte[] {GREATEST, GREATEST},
         new byte[] {GREATEST, GREATEST, GREATEST});
 
     Comparator<byte[]> comparator = SignedBytes.lexicographicalComparator();
     Helpers.testComparator(comparator, ordered);
   }
 }