package ch.zhaw.hexboard;

import java.awt.Point;
import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.*;

/***
 * <p>
 * This class performs tests for the class {@link Edge}.
 * </p>
 * 
 * @author tebe
 * 
 **/
public class EdgeTest {

  private Point[] hexagon22 = { new Point(2, 0), new Point(3, 1), new Point(3, 3), new Point(2, 4),
      new Point(1, 3), new Point(1, 1) };
  private Point[] hexagon75 = { new Point(7, 3), new Point(8, 4), new Point(8, 6), new Point(7, 7),
      new Point(6, 6), new Point(6, 4) };

  @Test
  public void createValidEdge() {
    new Edge(new Point(0, 0), new Point(1, 1));
  }

  @Test
  public void edgeEqualityStartEndPointReversed() {
    for (int i = 0; i < hexagon22.length - 1; i++) {
      assertEquals(new Edge(hexagon22[i], hexagon22[i + 1]),
          new Edge(hexagon22[i + 1], hexagon22[i]));
    }
    for (int i = 0; i < hexagon75.length - 1; i++) {
      assertEquals(new Edge(hexagon75[i], hexagon75[i + 1]),
          new Edge(hexagon75[i + 1], hexagon75[i]));
    }
  }

  @Test
  public void notEquals() {
   assertNotEquals(new Edge(hexagon22[0], hexagon22[1]),
        new Edge(hexagon22[1], hexagon22[2]));
  }

  @Test
  public void createWithBothArgumentsNull() {
    assertThrows(IllegalArgumentException.class, () -> new Edge(null, null));
  }

  @Test
  public void createWithFirstArgumentNull() {
    assertThrows(IllegalArgumentException.class, () -> new Edge(null, new Point(1, 0)));
  }

  @Test
  public void createWithSecondArgumentNull() {
    assertThrows(IllegalArgumentException.class, () -> new Edge(new Point(1, 0), null));
  }

  @Test
  public void createWithStartAndEndpointIdentical() {
    assertThrows(IllegalArgumentException.class, () -> new Edge(hexagon22[0], hexagon22[0]));
  }

  @Test
  public void notAnEdgeHorizontalOddTop() {
    assertThrows(IllegalArgumentException.class, () -> new Edge(new Point(5, 7), new Point(7, 7)));
  }

  @Test
  public void notAnEdgeHorizontalOddMiddle() {
    assertThrows(IllegalArgumentException.class, () -> new Edge(new Point(3, 2), new Point(5, 2)));
  }

  @Test
  public void notAnEdgeHorizontalOddBottom() {
    assertThrows(IllegalArgumentException.class, () -> new Edge(new Point(5, 3), new Point(7, 3)));
  }

  @Test
  public void notAnEdgeHorizontalEvenTop() {
    assertThrows(IllegalArgumentException.class, () -> new Edge(new Point(4, 4), new Point(6, 4)));
  }

  @Test
  public void notAnEdgeHorizontalEvenMiddle() {
    assertThrows(IllegalArgumentException.class, () -> new Edge(new Point(2, 5), new Point(4, 5)));
  }

  @Test
  public void notAnEdgeHorizontalEvenBottom() {
    assertThrows(IllegalArgumentException.class, () -> new Edge(new Point(4, 6), new Point(6, 6)));
  }

  @Test
  public void notAnEdgeVerticalEven() {
    assertThrows(IllegalArgumentException.class, () -> new Edge(new Point(7, 7), new Point(7, 3)));
  }

  @Test
  public void notAnEdgeVerticalOdd() {
    assertThrows(IllegalArgumentException.class, () -> new Edge(new Point(6, 4), new Point(6, 0)));
  }

}