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

import java.util.Arrays;

import org.junit.jupiter.api.Test;

class ClosestDistanceTest {

    @Test
    void test() {
        int[] x = { 0, 3 };
        int[] y = { 0, 4 };
        double result = 5.0;
        assertEquals(result, CloestDistance.minimalDistance(x, y), 0.0001);
    }

    @Test
    void testThreePoints() {
        int[] x = { 0, 3, 5 };
        int[] y = { 0, 4, 6 };
        double result = 2.828427;
        assertEquals(result, CloestDistance.minimalDistance(x, y), 0.0001);
    }

    @Test
    void test1() {
        int[] x = { 7, 1, 4, 7 };
        int[] y = { 7, 100, 8, 7 };
        double result = 0.0;
        assertEquals(result, CloestDistance.minimalDistance(x, y), 0.0001);
    }

    @Test
    void test2() {
        int[] x = { 4, -2, -3, -1, 2, -4, 1, -1, 3, -4, -2 };
        int[] y = { 4, -2, -4, 3, 3, 0, 1, -1, -1, 2, 4 };
        double result = 1.414213;
        assertEquals(result, CloestDistance.minimalDistance(x, y), 0.0001);
    }

    @Test
    void testSortPointsArray() {
        int[] x = { 4, -2, -3, -1, 2, -4, 1, -1, 3, -4, -2 };
        int[] y = { 4, -2, -4, 3, 3, 0, 1, -1, -1, 2, 4 };
        CloestDistance.Point[] p = new CloestDistance.Point[11];
        for (int i = 0; i < p.length; i++) {
            p[i] = new CloestDistance.Point(x[i], y[i]);
        }

        Arrays.sort(p, new CloestDistance.XComparator());
        assertEquals(-4, p[0].x);
        assertEquals(0, p[0].y);

        Arrays.sort(p, new CloestDistance.YComparator());
        assertEquals(-4, p[0].y);
        assertEquals(-3, p[0].x);
        assertEquals(4, p[10].y);
        assertEquals(4, p[10].x);

    }

    @Test
    void testDistance() {
        CloestDistance.Point p1 = new CloestDistance.Point(0, 0);
        CloestDistance.Point p2 = new CloestDistance.Point(1, 1);
        double result = 1.414213;
        assertEquals(result, CloestDistance.distance(p1, p2), 0.0001);
    }

}