/*******************************************************************************
 * Copyright (c) 2007, 2011 Association for Decentralized Information Management in
 * Industry THTH ry.
 * 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:
 *     VTT Technical Research Centre of Finland - initial API and implementation
 *******************************************************************************/
package org.simantics.databoard.binding.impl;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;

import org.simantics.databoard.Bindings;
import org.simantics.databoard.Datatypes;
import org.simantics.databoard.binding.Binding;
import org.simantics.databoard.binding.RecordBinding;
import org.simantics.databoard.binding.error.BindingConstructionException;
import org.simantics.databoard.binding.error.BindingException;
import org.simantics.databoard.type.OptionalType;
import org.simantics.databoard.type.RecordType;

/**
 * This class Binds throwables to the following record: 
 *   { detailMessage : Optional(String) }
 *   
 * The bound throwable class must have constructor( String ).
 *
 * @author toni.kalajainen
 */
public class ThrowableBinding extends RecordBinding {

	private Class<Throwable> boundClass;
	private Constructor<Throwable> constructor;
	private Constructor<Throwable> constructorNoArgs;
	
	public ThrowableBinding( Class<Throwable> classToBindTo ) throws BindingConstructionException {
		this.boundClass = classToBindTo;
		type = new RecordType();
		RecordType rt = (RecordType) type;
		rt.addComponent("detailMessage", new OptionalType( Datatypes.STRING ));		
		this.componentBindings = new Binding[1];
		this.componentBindings[0] = new OptionalBindingDefault( Bindings.STRING );
		try {
			constructor = boundClass.getConstructor( String.class );
			constructor.setAccessible( true );
		} catch (SecurityException e) {
			throw new BindingConstructionException( e );
		} catch (NoSuchMethodException e) {
			throw new BindingConstructionException( e );
		}
		
		try {
			constructorNoArgs = boundClass.getConstructor();
			constructorNoArgs.setAccessible( true );
		} catch (SecurityException e) {
		} catch (NoSuchMethodException e) {
		}
		
	}

	@Override
	public Object getComponent(Object obj, int index) throws BindingException {
		if ( index != 0 ) throw new BindingException("Index out of range");
		if ( obj instanceof Throwable == false ) throw new BindingException("not Throwable");
		Throwable t = (Throwable) obj;
		return t.getMessage();
	}

	@Override
	public Object create(Object... values) throws BindingException {
		if (values.length!=1) throw new BindingException("Invalid argument");
		try {
			return constructor.newInstance( values );
		} catch (IllegalArgumentException e) {
			throw new BindingException( e ); 
		} catch (InstantiationException e) {
			throw new BindingException( e ); 
		} catch (IllegalAccessException e) {
			throw new BindingException( e ); 
		} catch (InvocationTargetException e) {
			throw new BindingException( e.getCause() ); 
		}
	}

	@Override
	public Object createPartial() throws BindingException {
		if ( constructorNoArgs!=null ) {
			try {
				return constructorNoArgs.newInstance();
			} catch (IllegalArgumentException e) {
				throw new BindingException( e );
			} catch (InstantiationException e) {
				throw new BindingException( e );
			} catch (IllegalAccessException e) {
				throw new BindingException( e );
			} catch (InvocationTargetException e) {
				throw new BindingException( e.getCause() );
			}
		}
		
		try {
			return constructor.newInstance((Object[]) null);
		} catch (IllegalArgumentException e) {
			throw new BindingException( e );
		} catch (InstantiationException e) {
			throw new BindingException( e );
		} catch (IllegalAccessException e) {
			throw new BindingException( e );
		} catch (InvocationTargetException e) {
			throw new BindingException( e.getCause() );
		}
	}

	@Override
	public void setComponents(Object obj, Object... value)
			throws BindingException {
//		if ( value.length != 1 ) throw new BindingException("Array out of range");
//		if ( obj instanceof Throwable == false ) throw new BindingException("not Throwable");
//		Throwable t = (Throwable) obj;
		throw new BindingException("Cannot set message to Throwable");
	}

	@Override
	public void setComponent(Object obj, int index, Object value)
			throws BindingException {
		throw new BindingException("Cannot set message to Throwable");
	}

	@Override
	public boolean isInstance(Object obj) {
		return obj instanceof Throwable;
	}

	@Override
	protected boolean baseEquals(Object obj) {
		ThrowableBinding o = (ThrowableBinding)obj;
		return super.baseEquals(obj) && o.boundClass.equals(boundClass);
	}
	
	@Override
	public int baseHashCode() {
		return super.baseHashCode() + 13 * boundClass.hashCode();
	}
}