/*******************************************************************************
 * Copyright (c) 2006, 2008 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *     Brad Reynolds - bug 167204
 *     Matthew Hall - bugs 208858, 213145
 *******************************************************************************/

package org.eclipse.core.tests.databinding.observable.list;

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

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;

import org.eclipse.core.databinding.observable.Diffs;
import org.eclipse.core.databinding.observable.IObservable;
import org.eclipse.core.databinding.observable.IObservableCollection;
import org.eclipse.core.databinding.observable.Realm;
import org.eclipse.core.databinding.observable.list.IListChangeListener;
import org.eclipse.core.databinding.observable.list.ListChangeEvent;
import org.eclipse.core.databinding.observable.list.ListDiff;
import org.eclipse.core.databinding.observable.list.ListDiffEntry;
import org.eclipse.core.databinding.observable.list.ObservableList;
import org.eclipse.jface.databinding.conformance.ObservableListContractTest;
import org.eclipse.jface.databinding.conformance.delegate.AbstractObservableCollectionContractDelegate;
import org.eclipse.jface.databinding.conformance.util.CurrentRealm;
import org.eclipse.jface.databinding.conformance.util.RealmTester;

/**
 * @since 3.2
 */
public class ObservableListTest extends TestCase {
	private ObservableListStub list;

	protected void setUp() throws Exception {
		RealmTester.setDefault(new CurrentRealm(true));

		list = new ObservableListStub(new ArrayList(0), Object.class);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see junit.framework.TestCase#tearDown()
	 */
	protected void tearDown() throws Exception {
		RealmTester.setDefault(null);
	}

	public void testIsStaleRealmChecks() throws Exception {
		RealmTester.exerciseCurrent(new Runnable() {
			public void run() {
				list.isStale();
			}
		});
	}

	public void testSetStaleRealmChecks() throws Exception {
		RealmTester.exerciseCurrent(new Runnable() {
			public void run() {
				list.setStale(false);
			}
		});
	}

	public void testMove_FiresListChanges() throws Exception {
		list = new MutableObservableListStub();
		final Object element = new Object();
		list.add(0, element);
		list.add(1, new Object());

		final List diffEntries = new ArrayList();
		list.addListChangeListener(new IListChangeListener() {
			public void handleListChange(ListChangeEvent event) {
				diffEntries.addAll(Arrays.asList(event.diff.getDifferences()));
			} 
		}); 

		list.move(0, 1);

		assertEquals(2, diffEntries.size());

		ListDiffEntry entry = (ListDiffEntry) diffEntries.get(0);
		assertEquals(element, entry.getElement());
		assertEquals(false, entry.isAddition());
		assertEquals(0, entry.getPosition());

		entry = (ListDiffEntry) diffEntries.get(1);
		assertEquals(element, entry.getElement());
		assertEquals(true, entry.isAddition());
		assertEquals(1, entry.getPosition());
	}

	public void testMove_MovesElement() throws Exception {
		list = new MutableObservableListStub();
		final Object element0 = new Object();
		final Object element1 = new Object();
		list.add(0, element0);
		list.add(1, element1);
		
		list.move(0, 1);

		assertEquals(element1, list.get(0));
		assertEquals(element0, list.get(1));
	}

	public static Test suite() {
		TestSuite suite = new TestSuite(ObservableListTest.class.getName());
		suite.addTestSuite(ObservableListTest.class);
		suite.addTest(ObservableListContractTest.suite(new Delegate()));
		return suite;
	}
	
	/* package */ static class Delegate extends AbstractObservableCollectionContractDelegate {
		public IObservableCollection createObservableCollection(Realm realm, final int elementCount) {
			List wrappedList = new ArrayList();
			for (int i = 0; i < elementCount; i++) {
				wrappedList.add(String.valueOf(i));
			}
			
			return new MutableObservableListStub(realm, wrappedList, String.class);
		}
		
		public void change(IObservable observable) {
			ObservableListStub list = (ObservableListStub) observable;
			Object element = "element";
			list.wrappedList.add(element);
			list.fireListChange(Diffs.createListDiff(Diffs.createListDiffEntry(list.size(), true, element)));
		}
		
		public Object getElementType(IObservableCollection collection) {
			return String.class;
		}
	}

	/* package */static class ObservableListStub extends ObservableList {
		List wrappedList;
		ObservableListStub(Realm realm, List wrappedList, Object elementType) {
			super(realm, wrappedList, elementType);
			this.wrappedList = wrappedList;
		}
		
		ObservableListStub(List wrappedList, Object elementType) {
			super(wrappedList, elementType);
			this.wrappedList = wrappedList;
		}
		
		protected void fireListChange(ListDiff diff) {
			super.fireListChange(diff);
		}
	}

	/* package */static class MutableObservableListStub extends
			ObservableListStub {
		MutableObservableListStub() {
			this(Realm.getDefault(), new ArrayList(), null);
		}

		MutableObservableListStub(Realm realm, List wrappedList,
				Object elementType) {
			super(realm, wrappedList, elementType);
		}

		public void add(int index, Object element) {
			checkRealm();
			wrappedList.add(index, element);
			fireListChange(Diffs.createListDiff(Diffs.createListDiffEntry(
					index, true, element)));
		}

		public Object remove(int index) {
			checkRealm();
			Object element = wrappedList.remove(index);
			fireListChange(Diffs.createListDiff(Diffs.createListDiffEntry(
					index, false, element)));
			return element;
		}
	}
}