package jalview.util;

import static org.testng.AssertJUnit.assertEquals;
import static org.testng.AssertJUnit.assertNull;

import java.awt.Color;

import org.testng.annotations.Test;

public class ColorUtilsTest
{

  Color paleColour = new Color(97, 203, 111); // pale green

  Color midColour = new Color(135, 57, 41); // mid red

  Color darkColour = new Color(11, 30, 50); // dark blue

  @Test
  public void testDarkerThan()
  {
    assertEquals("Wrong darker shade", new Color(32, 69, 37),
            ColorUtils.darkerThan(paleColour));
    assertEquals("Wrong darker shade", new Color(45, 18, 13),
            ColorUtils.darkerThan(midColour));
    assertEquals("Wrong darker shade", new Color(2, 9, 16),
            ColorUtils.darkerThan(darkColour));
    assertNull(ColorUtils.darkerThan(null));
  }

  @Test
  public void testBrighterThan()
  {
    assertEquals("Wrong brighter shade", new Color(255, 255, 255), // white
            ColorUtils.brighterThan(paleColour));
    assertEquals("Wrong brighter shade", new Color(255, 164, 117),
            ColorUtils.brighterThan(midColour));
    assertEquals("Wrong brighter shade", new Color(30, 85, 144),
            ColorUtils.brighterThan(darkColour));
    assertNull(ColorUtils.brighterThan(null));
  }

  /**
   * @see http://www.rtapo.com/notes/named_colors.html
   */
  @Test
  public void testToTkCode()
  {
    assertEquals("#fffafa", ColorUtils.toTkCode(new Color(255, 250, 250))); // snow
    assertEquals("#e6e6fa", ColorUtils.toTkCode(new Color(230, 230, 250))); // lavender
    assertEquals("#dda0dd", ColorUtils.toTkCode(new Color(221, 160, 221))); // plum
    assertEquals("#800080", ColorUtils.toTkCode(new Color(128, 0, 128))); // purple
    assertEquals("#00ff00", ColorUtils.toTkCode(new Color(0, 255, 0))); // lime
  }
}