/*******************************************************************************
 * Copyright (c) 2006, 2007 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.core.internal.context.orm;

import java.util.Iterator;
import org.eclipse.jpt.core.context.Entity;
import org.eclipse.jpt.core.context.FetchType;
import org.eclipse.jpt.core.context.Fetchable;
import org.eclipse.jpt.core.context.orm.OrmPersistentAttribute;
import org.eclipse.jpt.core.context.orm.OrmRelationshipMapping;
import org.eclipse.jpt.core.resource.orm.XmlRelationshipMapping;
import org.eclipse.jpt.utility.internal.iterators.EmptyIterator;


public abstract class AbstractOrmRelationshipMapping<T extends XmlRelationshipMapping> extends AbstractOrmAttributeMapping<T>
	implements OrmRelationshipMapping
{
	
	protected String specifiedTargetEntity;

	protected String defaultTargetEntity;

	protected Entity resolvedTargetEntity;
	
	protected FetchType specifiedFetch;
	
	protected final OrmCascade cascade;

	
	protected AbstractOrmRelationshipMapping(OrmPersistentAttribute parent) {
		super(parent);
		this.cascade = new OrmCascade(this);
	}

	public String getTargetEntity() {
		return (this.getSpecifiedTargetEntity() == null) ? getDefaultTargetEntity() : this.getSpecifiedTargetEntity();
	}

	public String getSpecifiedTargetEntity() {
		return this.specifiedTargetEntity;
	}

	public void setSpecifiedTargetEntity(String newSpecifiedTargetEntity) {
		String oldSpecifiedTargetEntity = this.specifiedTargetEntity;
		this.specifiedTargetEntity = newSpecifiedTargetEntity;
		attributeMapping().setTargetEntity(newSpecifiedTargetEntity);
		firePropertyChanged(SPECIFIED_TARGET_ENTITY_PROPERTY, oldSpecifiedTargetEntity, newSpecifiedTargetEntity);
	}

	protected void setSpecifiedTargetEntity_(String newSpecifiedTargetEntity) {
		String oldSpecifiedTargetEntity = this.specifiedTargetEntity;
		this.specifiedTargetEntity = newSpecifiedTargetEntity;
		firePropertyChanged(SPECIFIED_TARGET_ENTITY_PROPERTY, oldSpecifiedTargetEntity, newSpecifiedTargetEntity);
	}

	public String getDefaultTargetEntity() {
		return this.defaultTargetEntity;
	}

	protected void setDefaultTargetEntity(String newDefaultTargetEntity) {
		String oldDefaultTargetEntity = this.defaultTargetEntity;
		this.defaultTargetEntity = newDefaultTargetEntity;
		firePropertyChanged(DEFAULT_TARGET_ENTITY_PROPERTY, oldDefaultTargetEntity, newDefaultTargetEntity);
	}

	public Entity getResolvedTargetEntity() {
		return this.resolvedTargetEntity;
	}

	protected void setResolvedTargetEntity(Entity newResolvedTargetEntity) {
		Entity oldResolvedTargetEntity = this.resolvedTargetEntity;
		this.resolvedTargetEntity = newResolvedTargetEntity;
		firePropertyChanged(RESOLVED_TARGET_ENTITY_PROPERTY, oldResolvedTargetEntity, newResolvedTargetEntity);
	}

	public FetchType getFetch() {
		return (this.getSpecifiedFetch() == null) ? this.getDefaultFetch() : this.getSpecifiedFetch();
	}

	public FetchType getSpecifiedFetch() {
		return this.specifiedFetch;
	}
	
	public void setSpecifiedFetch(FetchType newSpecifiedFetch) {
		FetchType oldFetch = this.specifiedFetch;
		this.specifiedFetch = newSpecifiedFetch;
		this.attributeMapping().setFetch(FetchType.toOrmResourceModel(newSpecifiedFetch));
		firePropertyChanged(Fetchable.SPECIFIED_FETCH_PROPERTY, oldFetch, newSpecifiedFetch);
	}

	protected void setSpecifiedFetch_(FetchType newSpecifiedFetch) {
		FetchType oldFetch = this.specifiedFetch;
		this.specifiedFetch = newSpecifiedFetch;
		firePropertyChanged(Fetchable.SPECIFIED_FETCH_PROPERTY, oldFetch, newSpecifiedFetch);
	}

	public OrmCascade getCascade() {
		return this.cascade;
	}


	@Override
	public void initializeFromXmlRelationshipMapping(OrmRelationshipMapping oldMapping) {
		super.initializeFromXmlRelationshipMapping(oldMapping);
		setSpecifiedTargetEntity(oldMapping.getSpecifiedTargetEntity());
		setSpecifiedFetch(oldMapping.getSpecifiedFetch());
		getCascade().initializeFrom(oldMapping.getCascade());
	}
	//TODO should we set the fetch type from a BasicMapping??

	
//	public boolean targetEntityIsValid(String targetEntity) {
//		return RelationshipMappingTools.targetEntityIsValid(targetEntity);
//	}
//
//	public IEntity getEntity() {
//		ITypeMapping typeMapping = getPersistentType().getMapping();
//		if (typeMapping instanceof IEntity) {
//			return (IEntity) typeMapping;
//		}
//		return null;
//	}
//
//	public String fullyQualifiedTargetEntity(CompilationUnit astRoot) {
//		if (getTargetEntity() == null) {
//			return null;
//		}
//		if (targetEntityIncludesPackage()) {
//			return getTargetEntity();
//		}
//		String package_ = persistentType().getMapping().getEntityMappings().getPackage();
//		if (package_ != null) {
//			return package_ + '.' + getTargetEntity();
//		}
//		return getTargetEntity();
//	}
//
//	private boolean targetEntityIncludesPackage() {
//		return getTargetEntity().lastIndexOf('.') != -1;
//	}

	public Iterator<String> allTargetEntityAttributeNames() {
		Entity targetEntity = this.getResolvedTargetEntity();
		return (targetEntity == null) ? EmptyIterator.<String> instance() : targetEntity.persistentType().allAttributeNames();
	}

	public Iterator<String> candidateMappedByAttributeNames() {
		return this.allTargetEntityAttributeNames();
	}

//	@Override
//	public void refreshDefaults(DefaultsContext defaultsContext) {
//		super.refreshDefaults(defaultsContext);
//		setDefaultTargetEntity((String) defaultsContext.getDefault(GenericJpaPlatform.DEFAULT_TARGET_ENTITY_KEY));
//		String targetEntity = fullyQualifiedTargetEntity(defaultsContext.astRoot());
//		if (targetEntity != null) {
//			IPersistentType persistentType = defaultsContext.persistentType(targetEntity);
//			if (persistentType != null) {
//				if (persistentType.getMapping() instanceof IEntity) {
//					setResolvedTargetEntity((IEntity) persistentType.getMapping());
//					return;
//				}
//			}
//		}
//		setResolvedTargetEntity(null);
//	}
//
//	/**
//	 * the default 'targetEntity' is calculated from the attribute type;
//	 * return null if the attribute type cannot possibly be an entity
//	 */
//	public String javaDefaultTargetEntity(CompilationUnit astRoot) {
//		ITypeBinding typeBinding = this.getPersistentAttribute().getAttribute().typeBinding(astRoot);
//		if (typeBinding != null) {
//			return this.javaDefaultTargetEntity(typeBinding);
//		}
//		return null;
//	}
//
//	protected String javaDefaultTargetEntity(ITypeBinding typeBinding) {
//		return buildReferenceEntityTypeName(typeBinding);
//	}
//
//	protected String buildReferenceEntityTypeName(ITypeBinding typeBinding) {
//		return JavaRelationshipMapping.buildReferenceEntityTypeName(typeBinding);
//	}
		
	public Entity getEntity() {
		// TODO Auto-generated method stub
		return null;
	}
	
	public boolean targetEntityIsValid(String targetEntity) {
		// TODO Auto-generated method stub
		return false;
	}
	
	@Override
	public void initialize(T relationshipMapping) {
		super.initialize(relationshipMapping);
		this.specifiedTargetEntity = relationshipMapping.getTargetEntity();
		this.defaultTargetEntity = null;//TODO default target entity
		this.specifiedFetch = this.specifiedFetch(relationshipMapping);
		this.cascade.initialize(relationshipMapping);
	}
	
	@Override
	public void update(T relationshipMapping) {
		super.update(relationshipMapping);
		this.setSpecifiedTargetEntity_(relationshipMapping.getTargetEntity());
		this.setDefaultTargetEntity(null);//TODO default target entity
		this.setSpecifiedFetch_(this.specifiedFetch(relationshipMapping));
		this.cascade.update(relationshipMapping);
	}
	
	protected FetchType specifiedFetch(XmlRelationshipMapping relationshipMapping) {
		return FetchType.fromOrmResourceModel(relationshipMapping.getFetch());
	}

}