/*******************************************************************************
 * Copyright (c) 2007, 2009 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.jpa1.context.java;

import java.util.Iterator;
import java.util.Vector;

import org.eclipse.jdt.core.dom.CompilationUnit;
import org.eclipse.jpt.core.JptCorePlugin;
import org.eclipse.jpt.core.MappingKeys;
import org.eclipse.jpt.core.context.AssociationOverride;
import org.eclipse.jpt.core.context.AssociationOverrideContainer;
import org.eclipse.jpt.core.context.AttributeMapping;
import org.eclipse.jpt.core.context.RelationshipReference;
import org.eclipse.jpt.core.context.TypeMapping;
import org.eclipse.jpt.core.context.java.JavaAssociationOverrideContainer;
import org.eclipse.jpt.core.context.java.JavaPersistentAttribute;
import org.eclipse.jpt.core.internal.context.java.AbstractJavaBaseEmbeddedMapping;
import org.eclipse.jpt.core.jpa2.JpaFactory2_0;
import org.eclipse.jpt.core.jpa2.context.java.JavaEmbeddedMapping2_0;
import org.eclipse.jpt.core.resource.java.EmbeddedAnnotation;
import org.eclipse.jpt.core.resource.java.JPA;
import org.eclipse.jpt.utility.Filter;
import org.eclipse.jpt.utility.internal.CollectionTools;
import org.eclipse.jpt.utility.internal.iterators.CompositeIterator;
import org.eclipse.jpt.utility.internal.iterators.TransformationIterator;


public class GenericJavaEmbeddedMapping
	extends AbstractJavaBaseEmbeddedMapping<EmbeddedAnnotation>
	implements JavaEmbeddedMapping2_0
{
	protected final JavaAssociationOverrideContainer associationOverrideContainer;

	public GenericJavaEmbeddedMapping(JavaPersistentAttribute parent) {
		super(parent);
		this.associationOverrideContainer = ((JpaFactory2_0) this.getJpaFactory()).buildJavaAssociationOverrideContainer(this, new AssociationOverrideContainerOwner());
	}
	
	@Override
	protected void initialize() {
		super.initialize();
		this.associationOverrideContainer.initialize(this.getResourcePersistentAttribute());
	}
	
	@Override
	protected void update() {
		super.update();
		this.associationOverrideContainer.update(this.getResourcePersistentAttribute());
	}

	@Override
	public void postUpdate() {
		super.postUpdate();
		this.associationOverrideContainer.postUpdate();
	}
	
	//****************** JavaAttributeMapping implementation *******************

	public String getKey() {
		return MappingKeys.EMBEDDED_ATTRIBUTE_MAPPING_KEY;
	}
	
	public String getAnnotationName() {
		return EmbeddedAnnotation.ANNOTATION_NAME;
	}
	
	//only putting this in EmbeddedMapping since relationship mappings
	//defined within an embedded id class are not supported by the 2.0 spec.
	@Override
	public Iterator<String> allMappingNames() {
		return this.isJpa2_0Compatible() ?
				new CompositeIterator<String>(this.getName(), this.embeddableAttributeMappingNames()) :
				super.allMappingNames();
	}
	
	protected Iterator<String> embeddableAttributeMappingNames() {
		return new TransformationIterator<String, String>(
			new CompositeIterator<String>(
				new TransformationIterator<AttributeMapping, Iterator<String>>(this.embeddableAttributeMappings()) {
					@Override
					protected Iterator<String> transform(AttributeMapping mapping) {
						return mapping.allMappingNames();
					}
				}
			)
		) {
			@Override
			protected String transform(String next) {
				return getName() + '.' + next;
			}
		};
	}

	@Override
	public AttributeMapping resolveAttributeMapping(String name) {
		AttributeMapping resolvedMapping = super.resolveAttributeMapping(name);
		if (resolvedMapping != null) {
			return resolvedMapping;
		}
		if (this.isJpa2_0Compatible()) {
			int dotIndex = name.indexOf('.');
			if (dotIndex != -1) {
				if (getName().equals(name.substring(0, dotIndex))) {
					for (AttributeMapping attributeMapping : CollectionTools.iterable(embeddableAttributeMappings())) {
						resolvedMapping = attributeMapping.resolveAttributeMapping(name.substring(dotIndex + 1));
						if (resolvedMapping != null) {
							return resolvedMapping;
						}
					}
				}
			}
		}
		return null;
	}
	
	@Override
	public RelationshipReference resolveRelationshipReference(String attributeName) {
		if (this.isJpa2_0Compatible()) {
			int dotIndex = attributeName.indexOf('.');
			if (dotIndex != -1) {
				if (getName().equals(attributeName.substring(0, dotIndex))) {
					attributeName = attributeName.substring(dotIndex + 1);
					AssociationOverride override = getAssociationOverrideContainer().getAssociationOverrideNamed(attributeName);
					if (override != null && !override.isVirtual()) {
						return override.getRelationshipReference();
					}
					if (this.getTargetEmbeddable() == null) {
						return null;
					}
					return this.getTargetEmbeddable().resolveRelationshipReference(attributeName);
				}
			}
		}
		return null;
	}
	
	//****************** AbstractJavaAttributeMapping implementation *******************
	@Override
	protected void addSupportingAnnotationNamesTo(Vector<String> names) {
		super.addSupportingAnnotationNamesTo(names);
		if (this.isJpa2_0Compatible()) {
			names.add(JPA.ASSOCIATION_OVERRIDE);
			names.add(JPA.ASSOCIATION_OVERRIDES);
		}
	}
	
	
	//****************** association overrides - 2.0 supports this *******************

	public JavaAssociationOverrideContainer getAssociationOverrideContainer() {
		return this.associationOverrideContainer;
	}

	
	@Override
	public Iterator<String> javaCompletionProposals(int pos, Filter<String> filter, CompilationUnit astRoot) {
		Iterator<String> result = super.javaCompletionProposals(pos, filter, astRoot);
		if (result != null) {
			return result;
		}
		
		result = getAssociationOverrideContainer().javaCompletionProposals(pos, filter, astRoot);
		if (result != null) {
			return result;
		}
		return null;
	}
	
	// ********** association override container owner **********

	class AssociationOverrideContainerOwner implements AssociationOverrideContainer.Owner {
		
		public TypeMapping getOverridableTypeMapping() {
			return GenericJavaEmbeddedMapping.this.getOverridableTypeMapping();
		}
		
		public TypeMapping getTypeMapping() {
			return GenericJavaEmbeddedMapping.this.getTypeMapping();
		}

		public RelationshipReference resolveRelationshipReference(String associationOverrideName) {
			TypeMapping overridableTypeMapping = getOverridableTypeMapping();
			RelationshipReference relationshipReference = null;
			if (overridableTypeMapping != null) {
				for (TypeMapping typeMapping : CollectionTools.iterable(overridableTypeMapping.inheritanceHierarchy())) {
					relationshipReference = typeMapping.resolveRelationshipReference(associationOverrideName);
					if (relationshipReference != null) {
						return relationshipReference;
					}
				}
			}
			return relationshipReference;
		}
	}

}