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package org.graalvm.collections.test;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Iterator;

import org.graalvm.collections.EconomicSet;

import org.graalvm.collections.Equivalence;

import org.junit.Assert;

import org.junit.Test;

public class EconomicSetTest {

    @Test

    public void testUtilities() {

        EconomicSet<Integer> set = EconomicSet.create(0);

        set.add(0);

        Assert.assertTrue(set.add(1));

        Assert.assertEquals(set.size(), 2);

        Assert.assertFalse(set.add(1));

        Assert.assertEquals(set.size(), 2);

        set.remove(1);

        Assert.assertEquals(set.size(), 1);

        set.remove(2);

        Assert.assertEquals(set.size(), 1);

        Assert.assertTrue(set.add(1));

        set.clear();

        Assert.assertEquals(set.size(), 0);

    }

    @Test

    public void testAddAll() {

        EconomicSet<Integer> set = EconomicSet.create();

        set.addAll(Arrays.asList(0, 1, 0));

        Assert.assertEquals(set.size(), 2);

        EconomicSet<Integer> newSet = EconomicSet.create();

        newSet.addAll(Arrays.asList(1, 2));

        Assert.assertEquals(newSet.size(), 2);

        newSet.addAll(set);

        Assert.assertEquals(newSet.size(), 3);

    }

    @Test

    public void testRemoveAll() {

        EconomicSet<Integer> set = EconomicSet.create();

        set.addAll(Arrays.asList(0, 1));

        set.removeAll(Arrays.asList(1, 2));

        Assert.assertEquals(set.size(), 1);

        set.removeAll(EconomicSet.create(set));

        Assert.assertEquals(set.size(), 0);

    }

    @Test

    public void testRetainAll() {

        EconomicSet<Integer> set = EconomicSet.create();

        set.addAll(Arrays.asList(0, 1, 2));

        EconomicSet<Integer> newSet = EconomicSet.create();

        newSet.addAll(Arrays.asList(2, 3));

        set.retainAll(newSet);

        Assert.assertEquals(set.size(), 1);

    }

    @Test

    public void testToArray() {

        EconomicSet<Integer> set = EconomicSet.create();

        set.addAll(Arrays.asList(0, 1));

        Assert.assertArrayEquals(set.toArray(new Integer[2]), new Integer[]{0, 1});

    }

    @Test

    public void testToString() {

        EconomicSet<Integer> set = EconomicSet.create();

        set.addAll(Arrays.asList(0, 1));

        Assert.assertEquals(set.toString(), "set(size=2, {0,1})");

    }

    @Test(expected = UnsupportedOperationException.class)

    public void testToUnalignedArray() {

        Assert.assertArrayEquals(EconomicSet.create().toArray(new Integer[2]), new Integer[0]);

    }

    @Test

    public void testSetRemoval() {

        ArrayList<Integer> initialList = new ArrayList<>();

        ArrayList<Integer> removalList = new ArrayList<>();

        ArrayList<Integer> finalList = new ArrayList<>();

        EconomicSet<Integer> set = EconomicSet.create(Equivalence.IDENTITY);

        set.add(1);

        set.add(2);

        set.add(3);

        set.add(4);

        set.add(5);

        set.add(6);

        set.add(7);

        set.add(8);

        set.add(9);

        Iterator<Integer> i1 = set.iterator();

        while (i1.hasNext()) {

            initialList.add(i1.next());

        }

        int size = 0;

        Iterator<Integer> i2 = set.iterator();

        while (i2.hasNext()) {

            Integer elem = i2.next();

            if (size++ < 8) {

                i2.remove();

            }

            removalList.add(elem);

        }

        Iterator<Integer> i3 = set.iterator();

        while (i3.hasNext()) {

            finalList.add(i3.next());

        }

        Assert.assertEquals(initialList, removalList);

        Assert.assertEquals(1, finalList.size());

        Assert.assertEquals(new Integer(9), finalList.get(0));

    }

}