import org.junit.Assert;
import org.junit.BeforeClass;
import org.junit.Test;

import java.util.Arrays;
import java.util.List;
import java.util.Map;


public class SimpleTest {

    private static Wisselgeld wisselgeld;

    @BeforeClass
    public static void init() {
        wisselgeld = new DynamischWisselgeld();
    }

    @Test
    public void test1() {
        List<Integer> munten = Arrays.asList(1, 2, 5, 10, 20, 50);
        int bedrag = 120;
        Map<Integer, Integer> antw = wisselgeld.wisselgeld(munten, bedrag);

        checkCoin(antw, 50, 2);
        checkCoin(antw, 20, 1);
        checkCoin(antw, 10, 0);
        checkCoin(antw, 5, 0);
        checkCoin(antw, 2, 0);
        checkCoin(antw, 1, 0);

        Assert.assertEquals("Bedrag incorrect.", 120, berekenTotaal(antw));
    }

    @Test
    public void test2() {
        List<Integer> munten = Arrays.asList(1, 2, 5, 10, 20, 50);
        int bedrag = 79;
        Map<Integer, Integer> antw = wisselgeld.wisselgeld(munten, bedrag);

        checkCoin(antw, 50, 1);
        checkCoin(antw, 20, 1);
        checkCoin(antw, 10, 0);
        checkCoin(antw, 5, 1);
        checkCoin(antw, 2, 2);
        checkCoin(antw, 1, 0);

        Assert.assertEquals("Bedrag incorrect.",79, berekenTotaal(antw));
    }

    @Test
    public void test3() {
        List<Integer> munten = Arrays.asList(1, 2, 5, 10, 20, 50);
        int bedrag = 208;
        Map<Integer, Integer> antw = wisselgeld.wisselgeld(munten, bedrag);

        checkCoin(antw, 50, 4);
        checkCoin(antw, 20, 0);
        checkCoin(antw, 10, 0);
        checkCoin(antw, 5, 1);
        checkCoin(antw, 2, 1);
        checkCoin(antw, 1, 1);

        Assert.assertEquals("Bedrag incorrect.",208, berekenTotaal(antw));
    }

    @Test
    public void test4() {
        List<Integer> munten = Arrays.asList(1, 2, 3, 10, 12, 37, 38, 76);
        int bedrag = 379;
        Map<Integer, Integer> antw = wisselgeld.wisselgeld(munten, bedrag);

        checkCoin(antw, 76, 4);
        checkCoin(antw, 38, 1);
        checkCoin(antw, 37, 1);
        checkCoin(antw, 12, 0);
        checkCoin(antw, 10, 0);
        checkCoin(antw, 3, 0);
        checkCoin(antw, 2, 0);
        checkCoin(antw, 1, 0);

        Assert.assertEquals("Bedrag incorrect.",379, berekenTotaal(antw));
    }

    @Test
    public void test5() {
        List<Integer> munten = Arrays.asList(1, 2, 3, 10, 12, 37, 38, 76);
        int bedrag = 112;
        Map<Integer, Integer> antw = wisselgeld.wisselgeld(munten, bedrag);

        checkCoin(antw, 76, 0);
        checkCoin(antw, 38, 1);
        checkCoin(antw, 37, 2);
        checkCoin(antw, 12, 0);
        checkCoin(antw, 10, 0);
        checkCoin(antw, 3, 0);
        checkCoin(antw, 2, 0);
        checkCoin(antw, 1, 0);

        Assert.assertEquals(112, berekenTotaal(antw));
    }

    private void checkCoin(Map<Integer, Integer> antw, int coin, int expectedCount) {
        Assert.assertEquals("Fout aantal munten van waarde " + coin + ".", expectedCount, antw.getOrDefault(coin, 0).intValue());
    }

    private int berekenTotaal(Map<Integer, Integer> map) {
        int bedrag = 0;
        for(int munt: map.keySet()) {
            bedrag += munt*map.get(munt);
        }
        return bedrag;
    }


    
}