/*******************************************************************************
 * 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.listener;

import java.lang.reflect.Method;

import org.eclipse.jpt.utility.internal.ClassTools;
import org.eclipse.jpt.utility.internal.model.AbstractModel;
import org.eclipse.jpt.utility.model.event.StateChangeEvent;
import org.eclipse.jpt.utility.model.listener.PropertyChangeListener;
import org.eclipse.jpt.utility.model.listener.ReflectiveChangeListener;
import org.eclipse.jpt.utility.model.listener.StateChangeListener;

import junit.framework.TestCase;

public class ReflectiveStateChangeListenerTests extends TestCase {
	
	public ReflectiveStateChangeListenerTests(String name) {
		super(name);
	}

	public void testZeroArgument() {
		TestModel testModel = new TestModel();
		Target target = new Target(testModel);
		testModel.addStateChangeListener(ReflectiveChangeListener.buildStateChangeListener(target, "stateChangedZeroArgument"));
		testModel.changeState();
		assertTrue(target.zeroArgumentFlag);
		assertFalse(target.singleArgumentFlag);
	}

	public void testSingleArgument() {
		TestModel testModel = new TestModel();
		Target target = new Target(testModel);
		testModel.addStateChangeListener(ReflectiveChangeListener.buildStateChangeListener(target, "stateChangedSingleArgument"));
		testModel.changeState();
		assertFalse(target.zeroArgumentFlag);
		assertTrue(target.singleArgumentFlag);
	}

	/**
	 * test method that has more general method parameter type
	 */
	public void testSingleArgument2() throws Exception {
		TestModel testModel = new TestModel();
		Target target = new Target(testModel);
		Method method = ClassTools.method(target, "stateChangedSingleArgument2", new Class[] {Object.class});
		testModel.addStateChangeListener(ReflectiveChangeListener.buildStateChangeListener(target, method));
		testModel.changeState();
		assertFalse(target.zeroArgumentFlag);
		assertTrue(target.singleArgumentFlag);
	}

	public void testListenerMismatch() {
		TestModel testModel = new TestModel();
		Target target = new Target(testModel);
		// build a STATE change listener and hack it so we
		// can add it as a PROPERTY change listener
		Object listener = ReflectiveChangeListener.buildStateChangeListener(target, "stateChangedSingleArgument");
		testModel.addPropertyChangeListener((PropertyChangeListener) listener);

		boolean exCaught = false;
		try {
			testModel.changeProperty();
			fail("listener mismatch: " + listener);
		} catch (IllegalArgumentException ex) {
			exCaught = true;
		}
		assertTrue(exCaught);
	}

	public void testBogusDoubleArgument1() {
		TestModel testModel = new TestModel();
		Target target = new Target(testModel);
		boolean exCaught = false;
		try {
			StateChangeListener listener = ReflectiveChangeListener.buildStateChangeListener(target, "stateChangedDoubleArgument");
			fail("bogus listener: " + listener);
		} catch (RuntimeException ex) {
			if (ex.getCause().getClass() == NoSuchMethodException.class) {
				exCaught = true;
			}
		}
		assertTrue(exCaught);
	}

	public void testBogusDoubleArgument2() throws Exception {
		TestModel testModel = new TestModel();
		Target target = new Target(testModel);
		Method method = ClassTools.method(target, "stateChangedDoubleArgument", new Class[] {StateChangeEvent.class, Object.class});
		boolean exCaught = false;
		try {
			StateChangeListener listener = ReflectiveChangeListener.buildStateChangeListener(target, method);
			fail("bogus listener: " + listener);
		} catch (RuntimeException ex) {
			if (ex.getMessage().equals(method.toString())) {
				exCaught = true;
			}
		}
		assertTrue(exCaught);
	}


	private class TestModel extends AbstractModel {
		TestModel() {
			super();
		}
		void changeState() {
			this.fireStateChanged();
		}
		void changeProperty() {
			this.firePropertyChanged("value", 55, 42);
		}
	}

	private class Target {
		TestModel testModel;
		boolean zeroArgumentFlag = false;
		boolean singleArgumentFlag = false;
		Target(TestModel testModel) {
			super();
			this.testModel = testModel;
		}
		void stateChangedZeroArgument() {
			this.zeroArgumentFlag = true;
		}
		void stateChangedSingleArgument(StateChangeEvent e) {
			this.singleArgumentFlag = true;
			assertSame(this.testModel, e.getSource());
		}
		void stateChangedSingleArgument2(Object e) {
			this.singleArgumentFlag = true;
			assertSame(this.testModel, ((StateChangeEvent) e).getSource());
		}
		void stateChangedDoubleArgument(StateChangeEvent e, Object o) {
			fail("bogus event: " + e);
		}
	}

}