package MyGeometryLib;

import org.junit.jupiter.api.Test;

import java.util.Random;

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

class SegmentTest {
    private final Random random = new Random();
    private final double DELTA = 1e-15;

    @Test
    void length() {
        for (int i = 0; i < 100; i++) {
            double ran = random.nextDouble();

            assertEquals(0,
                    new Segment(new Vector2D(ran, ran), new Vector2D(ran, ran)).length(), DELTA);
            assertEquals(0,
                    new Segment(new Vector3D(ran, ran, ran), new Vector3D(ran, ran, ran)).length(), DELTA);
        }

        assertEquals(Math.sqrt(309),
                new Segment(new Vector3D(9, -1, -8), new Vector3D(7, 3, 9)).length(), DELTA);
        assertEquals(Math.sqrt(7050.343),
                new Segment(new Vector2D(22.65, 7.19), new Vector2D(-11.27, 84)).length(), 0.00001);
    }

    @Test
    void distanceTo() {
        for (int i = 0; i < 100; i++) {
            double ran = random.nextDouble();
            double firstRan = random.nextDouble();
            double secondRan = random.nextDouble();
            double thirdRan = random.nextDouble();

            assertEquals(Math.sqrt(firstRan * firstRan + secondRan * secondRan),
                    new Segment(new Vector2D(ran, ran), new Vector2D(ran, ran)).distanceTo(new Vector2D(firstRan, secondRan)), DELTA);
            assertEquals(Math.sqrt(firstRan * firstRan + secondRan * secondRan + thirdRan*thirdRan),
                    new Segment(new Vector3D(ran, ran, ran), new Vector3D(ran, ran, ran)).distanceTo(new Vector3D(firstRan, secondRan, thirdRan)), DELTA);
        }

        assertEquals(0.0,
                new Segment(new Vector2D(0, 0), new Vector2D(0, 0)).distanceTo(new Vector2D(0, 0)), DELTA);
        assertEquals(0.0,
                new Segment(new Vector3D(0, 0, 0), new Vector3D(0, 0, 0)).distanceTo(new Vector3D(0, 0, 0)), DELTA);

        assertEquals(4.8,new Segment(new Vector2D(6, 0), new Vector2D(0, 8)).distanceTo(new Vector2D(0 , 0)), DELTA);
        assertEquals(5,
                new Segment(new Vector3D(1, -1, 3), new Vector3D(1, 3, 0)).distanceTo(new Vector3D(5, -6, 3)), 0.000000001);
    }
}