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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * accompanied this code).
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package test.com.sun.javafx.binding;

import com.sun.javafx.binding.ContentBinding;
import javafx.beans.binding.Bindings;
import javafx.collections.FXCollections;
import javafx.collections.ObservableSet;
import org.junit.Before;
import org.junit.Test;

import java.util.HashSet;
import java.util.Set;

import static org.junit.Assert.*;

public class ContentBindingSetTest {

    private Set<Integer> op1;
    private ObservableSet<Integer> op2;
    private ObservableSet<Integer> op3;
    private Set<Integer> set0;
    private Set<Integer> set1;
    private Set<Integer> set2;

    @Before
    public void setUp() {
        set0 = new HashSet<Integer>();
        set1 = new HashSet<Integer>();
        set1.add(-1);
        set2 = new HashSet<Integer>(2, 1);
        set2.add(2);
        set2.add(1);

        op1 = new HashSet<Integer>(set1);
        op2 = FXCollections.observableSet(set2);
        op3 = FXCollections.observableSet(set0);
    }

    @Test
    public void testBind() {
        Bindings.bindContent(op1, op2);
        System.gc(); // making sure we did not not overdo weak references
        assertEquals(set2, op1);
        assertEquals(set2, op2);

        op2.clear();
        op2.addAll(set1);
        assertEquals(set1, op1);
        assertEquals(set1, op2);

        op2.clear();
        op2.addAll(set0);
        assertEquals(set0, op1);
        assertEquals(set0, op2);

        op2.clear();
        op2.addAll(set2);
        assertEquals(set2, op1);
        assertEquals(set2, op2);
    }

    @Test(expected = NullPointerException.class)
    public void testBind_Null_X() {
        Bindings.bindContent(null, op2);
    }

    @Test(expected = NullPointerException.class)
    public void testBind_X_Null() {
        Bindings.bindContent(op1, null);
    }

    @Test(expected = IllegalArgumentException.class)
    public void testBind_X_Self() {
        Bindings.bindContent(op2, op2);
    }

    @Test
    public void testUnbind() {
        // unbind non-existing binding => no-op
        Bindings.unbindContent(op1, op2);

        Bindings.bindContent(op1, op2);
        System.gc(); // making sure we did not not overdo weak references
        assertEquals(set2, op1);
        assertEquals(set2, op2);

        Bindings.unbindContent(op1, op2);
        System.gc();
        assertEquals(set2, op1);
        assertEquals(set2, op2);

        op1.clear();
        assertEquals(set0, op1);
        assertEquals(set2, op2);

        op2.clear();
        op2.addAll(set1);
        assertEquals(set0, op1);
        assertEquals(set1, op2);
    }

    @Test(expected = NullPointerException.class)
    public void testUnbind_Null_X() {
        Bindings.unbindContent(null, op2);
    }

    @Test(expected = NullPointerException.class)
    public void testUnbind_X_Null() {
        Bindings.unbindContent(op1, null);
    }

    @Test(expected = IllegalArgumentException.class)
    public void testUnbind_X_Self() {
        Bindings.unbindContent(op2, op2);
    }

    @Test
    public void testChaining() {
        Bindings.bindContent(op1, op2);
        Bindings.bindContent(op2, op3);
        System.gc(); // making sure we did not not overdo weak references
        assertEquals(set0, op1);
        assertEquals(set0, op2);
        assertEquals(set0, op3);

        op3.clear();
        op3.addAll(set1);
        assertEquals(set1, op1);
        assertEquals(set1, op2);
        assertEquals(set1, op3);

        // now unbind 
        Bindings.unbindContent(op1, op2);
        System.gc(); // making sure we did not not overdo weak references
        assertEquals(set1, op1);
        assertEquals(set1, op2);
        assertEquals(set1, op3);

        op3.clear();
        op3.addAll(set2);
        assertEquals(set1, op1);
        assertEquals(set2, op2);
        assertEquals(set2, op3);
    }

    @Test
    public void testHashCode() {
        final int hc1 = ContentBinding.bind(op1, op2).hashCode();
        ContentBinding.unbind(op1, op2);
        final int hc2 = ContentBinding.bind(op1, op2).hashCode();
        assertEquals(hc1, hc2);
    }

    @Test
    public void testEquals() {
        final Object golden = ContentBinding.bind(op1, op2);
        ContentBinding.unbind(op1, op2);

        assertTrue(golden.equals(golden));
        assertFalse(golden.equals(null));
        assertFalse(golden.equals(op1));
        assertTrue(golden.equals(ContentBinding.bind(op1, op2)));
        ContentBinding.unbind(op1, op2);
        assertFalse(golden.equals(ContentBinding.bind(op3, op2)));
        ContentBinding.unbind(op2, op3);
        assertFalse(golden.equals(ContentBinding.bind(op2, op3)));
        ContentBinding.unbind(op2, op3);
    }

    @Test
    public void testEqualsWithGCedProperty() {
        final Object binding1 = ContentBinding.bind(op1, op2);
        ContentBinding.unbind(op1, op2);
        final Object binding2 = ContentBinding.bind(op1, op2);
        ContentBinding.unbind(op1, op2);
        op1 = null;
        System.gc();

        assertTrue(binding1.equals(binding1));
        assertFalse(binding1.equals(binding2));
    }
}