/*******************************************************************************
 * Copyright (c) 2007, 2008 Oracle. 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:
 *     Oracle - initial API and implementation
 ******************************************************************************/
package org.eclipse.jpt.utility.tests.internal.model.value;

import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;

import org.eclipse.jpt.utility.internal.CollectionTools;
import org.eclipse.jpt.utility.internal.HashBag;
import org.eclipse.jpt.utility.internal.iterators.ReadOnlyIterator;
import org.eclipse.jpt.utility.internal.model.AbstractModel;
import org.eclipse.jpt.utility.internal.model.value.CollectionAspectAdapter;
import org.eclipse.jpt.utility.internal.model.value.SimplePropertyValueModel;
import org.eclipse.jpt.utility.model.event.CollectionChangeEvent;
import org.eclipse.jpt.utility.model.listener.CollectionChangeListener;
import org.eclipse.jpt.utility.model.value.CollectionValueModel;
import org.eclipse.jpt.utility.model.value.PropertyValueModel;
import org.eclipse.jpt.utility.model.value.WritablePropertyValueModel;
import org.eclipse.jpt.utility.tests.internal.TestTools;

import junit.framework.TestCase;

public class CollectionAspectAdapterTests extends TestCase {
	private TestSubject subject1;
	private WritablePropertyValueModel<TestSubject> subjectHolder1;
	private LocalCollectionAspectAdapter aa1;
	private CollectionChangeEvent event1;
	private CollectionChangeListener listener1;
	private String event1Type;

	private static final String ADD = "add";
	private static final String REMOVE = "remove";
	private static final String CHANGE = "change";
	private static final String CLEAR = "clear";

	private TestSubject subject2;

	public CollectionAspectAdapterTests(String name) {
		super(name);
	}

	@Override
	protected void setUp() throws Exception {
		super.setUp();
		this.subject1 = new TestSubject();
		this.subject1.addNames(this.subject1Names());
		this.subject1.addDescriptions(this.subject1Descriptions());
		this.subjectHolder1 = new SimplePropertyValueModel<TestSubject>(this.subject1);
		this.aa1 = this.buildAspectAdapter(this.subjectHolder1);
		this.listener1 = this.buildValueChangeListener1();
		this.aa1.addCollectionChangeListener(CollectionValueModel.VALUES, this.listener1);
		this.event1 = null;
		this.event1Type = null;

		this.subject2 = new TestSubject();
		this.subject2.addNames(this.subject2Names());
		this.subject2.addDescriptions(this.subject2Descriptions());
	}

	private Collection<String> subject1Names() {
		Collection<String> result = new HashBag<String>();
		result.add("foo");
		result.add("bar");
		return result;
	}

	private Collection<String> subject1Descriptions() {
		Collection<String> result = new HashBag<String>();
		result.add("this.subject1 description1");
		result.add("this.subject1 description2");
		return result;
	}

	private Collection<String> subject2Names() {
		Collection<String> result = new HashBag<String>();
		result.add("baz");
		result.add("bam");
		return result;
	}

	private Collection<String> subject2Descriptions() {
		Collection<String> result = new HashBag<String>();
		result.add("this.subject2 description1");
		result.add("this.subject2 description2");
		return result;
	}

	private LocalCollectionAspectAdapter buildAspectAdapter(PropertyValueModel<TestSubject> subjectHolder) {
		return new LocalCollectionAspectAdapter(subjectHolder);
	}

	private CollectionChangeListener buildValueChangeListener1() {
		return new CollectionChangeListener() {
			public void itemsAdded(CollectionChangeEvent e) {
				CollectionAspectAdapterTests.this.value1Changed(e, ADD);
			}
			public void itemsRemoved(CollectionChangeEvent e) {
				CollectionAspectAdapterTests.this.value1Changed(e, REMOVE);
			}
			public void collectionCleared(CollectionChangeEvent e) {
				CollectionAspectAdapterTests.this.value1Changed(e, CLEAR);
			}
			public void collectionChanged(CollectionChangeEvent e) {
				CollectionAspectAdapterTests.this.value1Changed(e, CHANGE);
			}
		};
	}

	void value1Changed(CollectionChangeEvent e, String eventType) {
		this.event1 = e;
		this.event1Type = eventType;
	}

	@Override
	protected void tearDown() throws Exception {
		TestTools.clear(this);
		super.tearDown();
	}

	public void testSubjectHolder() {
		assertEquals(this.subject1Names(), CollectionTools.bag(this.aa1.iterator()));
		assertNull(this.event1);

		this.subjectHolder1.setValue(this.subject2);
		assertNotNull(this.event1);
		assertEquals(this.event1Type, CHANGE);
		assertEquals(this.aa1, this.event1.getSource());
		assertEquals(CollectionValueModel.VALUES, this.event1.getCollectionName());
		assertFalse(this.event1.items().hasNext());
		assertEquals(this.subject2Names(), CollectionTools.bag(this.aa1.iterator()));
		
		this.event1 = null;
		this.event1Type = null;
		this.subjectHolder1.setValue(null);
		assertNotNull(this.event1);
		assertEquals(this.event1Type, CHANGE);
		assertEquals(this.aa1, this.event1.getSource());
		assertEquals(CollectionValueModel.VALUES, this.event1.getCollectionName());
		assertFalse(this.event1.items().hasNext());
		assertFalse((this.aa1.iterator()).hasNext());
		
		this.event1 = null;
		this.event1Type = null;
		this.subjectHolder1.setValue(this.subject1);
		assertNotNull(this.event1);
		assertEquals(this.event1Type, CHANGE);
		assertEquals(this.aa1, this.event1.getSource());
		assertEquals(CollectionValueModel.VALUES, this.event1.getCollectionName());
		assertFalse(this.event1.items().hasNext());
		assertEquals(this.subject1Names(), CollectionTools.bag(this.aa1.iterator()));
	}

	public void testAdd() {
		assertEquals(this.subject1Names(), CollectionTools.bag(this.aa1.iterator()));
		assertNull(this.event1);

		this.subject1.addName("jam");
		assertNotNull(this.event1);
		assertEquals(this.event1Type, ADD);
		assertEquals(this.aa1, this.event1.getSource());
		assertEquals(CollectionValueModel.VALUES, this.event1.getCollectionName());
		assertEquals("jam", this.event1.items().next());
		Collection<String> namesPlus = this.subject1Names();
		namesPlus.add("jam");
		assertEquals(namesPlus, CollectionTools.bag(this.aa1.iterator()));

		this.event1 = null;
		this.event1Type = null;
		this.aa1.addAll(Collections.singleton("jaz"));
		assertNotNull(this.event1);
		assertEquals(this.event1Type, ADD);
		assertEquals(this.aa1, this.event1.getSource());
		assertEquals(CollectionValueModel.VALUES, this.event1.getCollectionName());
		assertEquals("jaz", this.event1.items().next());
		namesPlus.add("jaz");
		assertEquals(namesPlus, CollectionTools.bag(this.aa1.iterator()));
	}

	public void testRemove() {
		assertEquals(this.subject1Names(), CollectionTools.bag(this.aa1.iterator()));
		assertNull(this.event1);

		this.subject1.removeName("foo");
		assertNotNull(this.event1);
		assertEquals(this.event1Type, REMOVE);
		assertEquals(this.aa1, this.event1.getSource());
		assertEquals(CollectionValueModel.VALUES, this.event1.getCollectionName());
		assertEquals("foo", this.event1.items().next());
		Collection<String> namesMinus = this.subject1Names();
		namesMinus.remove("foo");
		assertEquals(namesMinus, CollectionTools.bag(this.aa1.iterator()));

		this.event1 = null;
		this.event1Type = null;
		this.aa1.removeAll(Collections.singleton("bar"));
		assertNotNull(this.event1);
		assertEquals(this.event1Type, REMOVE);
		assertEquals(this.aa1, this.event1.getSource());
		assertEquals(CollectionValueModel.VALUES, this.event1.getCollectionName());
		assertEquals("bar", this.event1.items().next());
		namesMinus.remove("bar");
		assertEquals(namesMinus, CollectionTools.bag(this.aa1.iterator()));
	}

	public void testCollectionChange() {
		assertEquals(this.subject1Names(), CollectionTools.bag(this.aa1.iterator()));
		assertNull(this.event1);

		this.subject1.addTwoNames("jam", "jaz");
		assertNotNull(this.event1);
		assertEquals(this.event1Type, CHANGE);
		assertEquals(this.aa1, this.event1.getSource());
		assertEquals(CollectionValueModel.VALUES, this.event1.getCollectionName());
		assertFalse(this.event1.items().hasNext());
		Collection<String> namesPlus2 = this.subject1Names();
		namesPlus2.add("jam");
		namesPlus2.add("jaz");
		assertEquals(namesPlus2, CollectionTools.bag(this.aa1.iterator()));
	}

	public void testIterator() {
		assertEquals(this.subject1Names(), CollectionTools.bag(this.subject1.names()));
		assertEquals(this.subject1Names(), CollectionTools.bag(this.aa1.iterator()));
	}

	public void testSize() {
		assertEquals(this.subject1Names().size(), CollectionTools.size(this.subject1.names()));
		assertEquals(this.subject1Names().size(), CollectionTools.size(this.aa1.iterator()));
	}

	public void testHasListeners() {
		assertTrue(this.aa1.hasAnyCollectionChangeListeners(CollectionValueModel.VALUES));
		assertTrue(this.subject1.hasAnyCollectionChangeListeners(TestSubject.NAMES_COLLECTION));
		this.aa1.removeCollectionChangeListener(CollectionValueModel.VALUES, this.listener1);
		assertFalse(this.subject1.hasAnyCollectionChangeListeners(TestSubject.NAMES_COLLECTION));
		assertFalse(this.aa1.hasAnyCollectionChangeListeners(CollectionValueModel.VALUES));

		CollectionChangeListener listener2 = this.buildValueChangeListener1();
		this.aa1.addCollectionChangeListener(listener2);
		assertTrue(this.aa1.hasAnyCollectionChangeListeners(CollectionValueModel.VALUES));
		assertTrue(this.subject1.hasAnyCollectionChangeListeners(TestSubject.NAMES_COLLECTION));
		this.aa1.removeCollectionChangeListener(listener2);
		assertFalse(this.subject1.hasAnyCollectionChangeListeners(TestSubject.NAMES_COLLECTION));
		assertFalse(this.aa1.hasAnyCollectionChangeListeners(CollectionValueModel.VALUES));
	}


	// ********** inner class **********
	
	private class TestSubject extends AbstractModel {
		private Collection<String> names;
		public static final String NAMES_COLLECTION = "names";
		private Collection<String> descriptions;
		public static final String DESCRIPTIONS_COLLECTION = "descriptions";
	
		public TestSubject() {
			this.names = new HashBag<String>();
			this.descriptions = new HashBag<String>();
		}
		public Iterator<String> names() {
			return new ReadOnlyIterator<String>(this.names);
		}
		public void addName(String name) {
			if (this.names.add(name)) {
				this.fireItemAdded(NAMES_COLLECTION, name);
			}
		}
		public void addNames(Iterator<String> newNames) {
			while (newNames.hasNext()) {
				this.addName(newNames.next());
			}
		}
		public void addNames(Collection<String> newNames) {
			this.addNames(newNames.iterator());
		}
		public void addTwoNames(String name1, String name2) {
			if (this.names.add(name1) | this.names.add(name2)) {
				this.fireCollectionChanged(NAMES_COLLECTION);
			}
		}
		public void removeName(String name) {
			if (this.names.remove(name)) {
				this.fireItemRemoved(NAMES_COLLECTION, name);
			}
		}
		public Iterator<String> descriptions() {
			return new ReadOnlyIterator<String>(this.descriptions);
		}
		public void addDescription(String description) {
			if (this.descriptions.add(description)) {
				this.fireItemAdded(DESCRIPTIONS_COLLECTION, description);
			}
		}
		public void addDescriptions(Iterator<String> newDescriptions) {
			while (newDescriptions.hasNext()) {
				this.addDescription(newDescriptions.next());
			}
		}
		public void addDescriptions(Collection<String> newDescriptions) {
			this.addDescriptions(newDescriptions.iterator());
		}
		public void removeDescription(String description) {
			if (this.descriptions.remove(description)) {
				this.fireItemRemoved(DESCRIPTIONS_COLLECTION, description);
			}
		}
	}

	// this is not a typical aspect adapter - the value is determined by the aspect name
	private class LocalCollectionAspectAdapter extends CollectionAspectAdapter<TestSubject, String> {

		LocalCollectionAspectAdapter(PropertyValueModel<TestSubject> subjectHolder) {
			super(subjectHolder, TestSubject.NAMES_COLLECTION);
		}

		@Override
		protected Iterator<String> iterator_() {
			if (this.collectionNames[0] == TestSubject.NAMES_COLLECTION) {
				return this.subject.names();
			}
			if (this.collectionNames[0] == TestSubject.DESCRIPTIONS_COLLECTION) {
				return this.subject.descriptions();
			}
			throw new IllegalStateException("invalid aspect name: " + this.collectionNames[0]);
		}

		public void add(String item) {
			if (this.collectionNames[0] == TestSubject.NAMES_COLLECTION) {
				this.subject.addName(item);
			} else if (this.collectionNames[0] == TestSubject.DESCRIPTIONS_COLLECTION) {
				this.subject.addDescription(item);
			} else {
				throw new IllegalStateException("invalid aspect name: " + this.collectionNames[0]);
			}
		}

		public void addAll(Collection<String> items) {
			for (Iterator<String> stream = items.iterator(); stream.hasNext(); ) {
				this.add(stream.next());
			}
		}

		public void remove(Object item) {
			if (this.collectionNames[0] == TestSubject.NAMES_COLLECTION) {
				this.subject.removeName((String) item);
			} else if (this.collectionNames[0] == TestSubject.DESCRIPTIONS_COLLECTION) {
				this.subject.removeDescription((String) item);
			} else {
				throw new IllegalStateException("invalid aspect name: " + this.collectionNames[0]);
			}
		}

		public void removeAll(Collection<String> items) {
			for (Iterator<String> stream = items.iterator(); stream.hasNext(); ) {
				this.remove(stream.next());
			}
		}

	}

}