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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.ObservableList;
import org.junit.Before;
import org.junit.Test;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import static org.junit.Assert.*;

public class ContentBindingListTest {

    private List<Integer> op1;
    private ObservableList<Integer> op2;
    private ObservableList<Integer> op3;
    private List<Integer> list0;
    private List<Integer> list1;
    private List<Integer> list2;

    @Before
    public void setUp() {
        list0 = new ArrayList<Integer>();
        list1 = new ArrayList<Integer>(Arrays.asList(0));
        list2 = new ArrayList<Integer>(Arrays.asList(2, 1));

        op1 = new ArrayList<Integer>(list1);
        op2 = FXCollections.observableArrayList(list2);
        op3 = FXCollections.observableArrayList(list0);
    }

    @Test
    public void testBind() {
        List<Integer> list2_sorted = new ArrayList<Integer>(Arrays.asList(1, 2));

        Bindings.bindContent(op1, op2);
        System.gc(); // making sure we did not not overdo weak references
        assertEquals(list2, op1);
        assertEquals(list2, op2);

        op2.setAll(list1);
        assertEquals(list1, op1);
        assertEquals(list1, op2);

        op2.setAll(list0);
        assertEquals(list0, op1);
        assertEquals(list0, op2);

        op2.setAll(list2);
        assertEquals(list2, op1);
        assertEquals(list2, op2);

        FXCollections.sort(op2);
        assertEquals(list2_sorted, op1);
        assertEquals(list2_sorted, 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(list2, op1);
        assertEquals(list2, op2);

        Bindings.unbindContent(op1, op2);
        System.gc();
        assertEquals(list2, op1);
        assertEquals(list2, op2);

        op1.clear();
        assertEquals(list0, op1);
        assertEquals(list2, op2);

        op2.setAll(list1);
        assertEquals(list0, op1);
        assertEquals(list1, 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(list0, op1);
        assertEquals(list0, op2);
        assertEquals(list0, op3);

        op3.setAll(list1);
        assertEquals(list1, op1);
        assertEquals(list1, op2);
        assertEquals(list1, op3);

        // now unbind
        Bindings.unbindContent(op1, op2);
        System.gc(); // making sure we did not not overdo weak references
        assertEquals(list1, op1);
        assertEquals(list1, op2);
        assertEquals(list1, op3);

        op3.setAll(list2);
        assertEquals(list1, op1);
        assertEquals(list2, op2);
        assertEquals(list2, 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));
    }

    @Test
    public void testAlreadyBound() {
        // get the current exception handler before replacing with our own,
        // as ListListenerHelper intercepts the exception otherwise
        final Thread.UncaughtExceptionHandler exceptionHandler =
                Thread.currentThread().getUncaughtExceptionHandler();
        Thread.currentThread().setUncaughtExceptionHandler((t, e) -> {
                throw new AssertionError("We don't expect any exceptions in this test!", e);
            }
        );

        ContentBinding.bind(op1, op2);
        ContentBinding.bind(op1, op2);
        op2.remove(1);

        // reset the exception handler
        Thread.currentThread().setUncaughtExceptionHandler(exceptionHandler);
    }

    @Test
    public void testChangeValue() {
        Bindings.bindContent(op1, op2);
        assertEquals(2, op1.get(0).intValue());
        op2.set(0, 1);
        assertEquals(1, op1.get(0).intValue());
    }
}
