/*******************************************************************************
 * Copyright (c) 2006, 2012 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.jpa.core.internal.context.orm;

import java.util.List;
import org.eclipse.jdt.core.IPackageFragment;
import org.eclipse.jdt.core.IType;
import org.eclipse.jpt.common.core.resource.java.JavaResourceType;
import org.eclipse.jpt.common.core.utility.TextRange;
import org.eclipse.jpt.common.utility.internal.CollectionTools;
import org.eclipse.jpt.common.utility.internal.StringTools;
import org.eclipse.jpt.common.utility.internal.Tools;
import org.eclipse.jpt.common.utility.internal.iterables.CompositeIterable;
import org.eclipse.jpt.common.utility.internal.iterables.EmptyIterable;
import org.eclipse.jpt.common.utility.internal.iterables.FilteringIterable;
import org.eclipse.jpt.common.utility.internal.iterables.SingleElementIterable;
import org.eclipse.jpt.common.utility.internal.iterables.TransformationIterable;
import org.eclipse.jpt.jpa.core.JpaStructureNode;
import org.eclipse.jpt.jpa.core.MappingKeys;
import org.eclipse.jpt.jpa.core.context.AttributeMapping;
import org.eclipse.jpt.jpa.core.context.Column;
import org.eclipse.jpt.jpa.core.context.Entity;
import org.eclipse.jpt.jpa.core.context.Generator;
import org.eclipse.jpt.jpa.core.context.InheritanceType;
import org.eclipse.jpt.jpa.core.context.PersistentType;
import org.eclipse.jpt.jpa.core.context.Relationship;
import org.eclipse.jpt.jpa.core.context.TypeMapping;
import org.eclipse.jpt.jpa.core.context.java.JavaPersistentType;
import org.eclipse.jpt.jpa.core.context.java.JavaTypeMapping;
import org.eclipse.jpt.jpa.core.context.orm.EntityMappings;
import org.eclipse.jpt.jpa.core.context.orm.OrmPersistentType;
import org.eclipse.jpt.jpa.core.context.orm.OrmReadOnlyPersistentAttribute;
import org.eclipse.jpt.jpa.core.context.orm.OrmTypeMapping;
import org.eclipse.jpt.jpa.core.internal.context.AttributeMappingTools;
import org.eclipse.jpt.jpa.core.internal.context.JptValidator;
import org.eclipse.jpt.jpa.core.internal.context.TypeMappingTextRangeResolver;
import org.eclipse.jpt.jpa.core.internal.context.TypeMappingTools;
import org.eclipse.jpt.jpa.core.internal.jpa1.context.GenericTypeMappingValidator;
import org.eclipse.jpt.jpa.core.internal.validation.DefaultJpaValidationMessages;
import org.eclipse.jpt.jpa.core.internal.validation.JpaValidationMessages;
import org.eclipse.jpt.jpa.core.resource.orm.XmlTypeMapping;
import org.eclipse.jpt.jpa.db.Schema;
import org.eclipse.jpt.jpa.db.Table;
import org.eclipse.text.edits.DeleteEdit;
import org.eclipse.text.edits.ReplaceEdit;
import org.eclipse.wst.validation.internal.provisional.core.IMessage;
import org.eclipse.wst.validation.internal.provisional.core.IReporter;

/**
 * <code>orm.xml</code> type mapping
 */
public abstract class AbstractOrmTypeMapping<X extends XmlTypeMapping>
	extends AbstractOrmXmlContextNode
	implements OrmTypeMapping
{
	// never null
	protected final X xmlTypeMapping;

	protected String class_;

	protected Boolean specifiedMetadataComplete;
	protected boolean overrideMetadataComplete;

	protected String specifiedParentClass;
	protected String defaultParentClass;
	protected String fullyQualifiedParentClass;

	protected AbstractOrmTypeMapping(OrmPersistentType parent, X xmlTypeMapping) {
		super(parent);
		this.xmlTypeMapping = xmlTypeMapping;
		this.class_ = xmlTypeMapping.getClassName();
		this.specifiedMetadataComplete = xmlTypeMapping.getMetadataComplete();
		this.specifiedParentClass = this.buildSpecifiedParentClass();
	}


	// ********** synchronize/update **********

	@Override
	public void synchronizeWithResourceModel() {
		super.synchronizeWithResourceModel();
		this.setClass_(this.xmlTypeMapping.getClassName());
		this.setSpecifiedMetadataComplete_(this.xmlTypeMapping.getMetadataComplete());
		this.setSpecifiedParentClass_(this.buildSpecifiedParentClass());
	}

	@Override
	public void update() {
		super.update();
		this.setOverrideMetadataComplete(this.buildOverrideMetadataComplete());
		this.setDefaultParentClass(this.buildDefaultParentClass());
		this.setFullyQualifiedParentClass(this.buildFullyQualifiedParentClass());
	}


	// ********** class **********

	public String getClass_() {
		return this.class_;
	}

	public void setClass(String class_) {
		this.setClass_(class_);
		this.xmlTypeMapping.setClassName(class_);
	}

	protected void setClass_(String class_) {
		String old = this.class_;
		this.class_ = class_;
		this.firePropertyChanged(CLASS_PROPERTY, old, class_);
	}


	// ********** metadata complete **********

	/**
	 * If <code>entity-mappings/persistence-unit-metadata/xml-mapping-metadata-complete</code>
	 * is specified, it overrides anything set here.
	 */
	public boolean isMetadataComplete() {
		if (this.overrideMetadataComplete) {
			return true;
		}
		return (this.specifiedMetadataComplete != null) ? this.specifiedMetadataComplete.booleanValue() : false;
	}

	public Boolean getSpecifiedMetadataComplete() {
		return this.specifiedMetadataComplete;
	}

	public void setSpecifiedMetadataComplete(Boolean metadataComplete) {
		this.setSpecifiedMetadataComplete_(metadataComplete);
		this.xmlTypeMapping.setMetadataComplete(metadataComplete);
	}

	protected void setSpecifiedMetadataComplete_(Boolean metadataComplete) {
		Boolean old = this.specifiedMetadataComplete;
		this.specifiedMetadataComplete = metadataComplete;
		this.firePropertyChanged(SPECIFIED_METADATA_COMPLETE_PROPERTY, old, metadataComplete);
	}

	public boolean isOverrideMetadataComplete() {
		return this.overrideMetadataComplete;
	}

	protected void setOverrideMetadataComplete(boolean metadataComplete) {
		boolean old = this.overrideMetadataComplete;
		this.overrideMetadataComplete = metadataComplete;
		this.firePropertyChanged(OVERRIDE_METADATA_COMPLETE_PROPERTY, old, metadataComplete);
	}

	protected boolean buildOverrideMetadataComplete() {
		return this.getPersistenceUnit().isXmlMappingMetadataComplete();
	}


	// ********** fully-qualified parent class **********

	public String getFullyQualifiedParentClass() {
		return this.fullyQualifiedParentClass;
	}

	protected void setFullyQualifiedParentClass(String parentClass) {
		String old = this.fullyQualifiedParentClass;
		this.fullyQualifiedParentClass = parentClass;
		this.firePropertyChanged(FULLY_QUALIFIED_PARENT_CLASS_PROPERTY, old, parentClass);
	}

	protected String buildFullyQualifiedParentClass() {
		return (this.specifiedParentClass == null) ?
				this.defaultParentClass :
				this.getEntityMappings().getFullyQualifiedName(this.specifiedParentClass);
	}

	// ********** parent class **********

	public String getParentClass() {
		return (this.specifiedParentClass != null) ? this.specifiedParentClass : this.defaultParentClass;
	}

	public String getSpecifiedParentClass() {
		return this.specifiedParentClass;
	}

	public void setSpecifiedParentClass(String parentClass) {
		this.setSpecifiedParentClass_(parentClass);
		this.setSpecifiedParentClassInXml(parentClass);
	}

	protected void setSpecifiedParentClass_(String parentClass) {
		String old = this.specifiedParentClass;
		this.specifiedParentClass = parentClass;
		this.firePropertyChanged(SPECIFIED_PARENT_CLASS_PROPERTY, old, parentClass);
	}

	/**
	 * subclasses must override if they support specifying a parent class
	 */
	protected void setSpecifiedParentClassInXml(String parentClass) {
		//no-op
	}

	/**
	 * subclasses must override if they support specifying a parent class
	 */
	protected String buildSpecifiedParentClass() {
		return null;
	}

	public String getDefaultParentClass() {
		return this.defaultParentClass;
	}

	protected void setDefaultParentClass(String parentClass) {
		String old = this.defaultParentClass;
		this.defaultParentClass = parentClass;
		this.firePropertyChanged(DEFAULT_PARENT_CLASS_PROPERTY, old, parentClass);
	}

	protected String buildDefaultParentClass() {
		JavaResourceType javaResourceType = this.getJavaResourceType();
		return (javaResourceType == null) ? null : javaResourceType.getSuperclassQualifiedName();
	}

	protected PersistentType getResolvedParentClass() {
		if (this.fullyQualifiedParentClass == null) {
			return null;
		}
		return this.getPersistenceUnit().getPersistentType(this.fullyQualifiedParentClass);
	}


	// ********** Java type mapping **********

	public JavaTypeMapping getJavaTypeMapping() {
		JavaPersistentType javaType = this.getJavaPersistentType();
		if (javaType == null) {
			return null;
		}
		return (javaType.getMappingKey() == this.getKey()) ? javaType.getMapping() : null;
	}

	public JavaTypeMapping getJavaTypeMappingForDefaults() {
		return this.isMetadataComplete() ? null : this.getJavaTypeMapping();
	}


	// ********** misc **********

	@Override
	public OrmPersistentType getParent() {
		return (OrmPersistentType) super.getParent();
	}

	public OrmPersistentType getPersistentType() {
		return this.getParent();
	}

	public String getName() {
		return this.getPersistentType().getName();
	}

	protected JavaPersistentType getJavaPersistentType() {
		return this.getPersistentType().getJavaPersistentType();
	}

	public JavaResourceType getJavaResourceType() {
		JavaPersistentType javaType = this.getJavaPersistentType();
		return (javaType == null) ? null : javaType.getJavaResourceType();
	}

	protected EntityMappings getEntityMappings() {
		return getPersistentType().getParent();
	}

	public boolean isMapped() {
		return true;
	}

	/**
	 * A type's mapping is being changed. Copy the common settings from the old
	 * mapping to the new (this).
	 */
	public void initializeFrom(OrmTypeMapping oldMapping) {
		this.setClass(oldMapping.getClass_());
		this.setSpecifiedMetadataComplete(oldMapping.getSpecifiedMetadataComplete());
		this.setOverrideMetadataComplete(oldMapping.isOverrideMetadataComplete());
	}

	public X getXmlTypeMapping() {
		return this.xmlTypeMapping;
	}

	public boolean attributeIsDerivedId(String attributeName) {
		return TypeMappingTools.attributeIsDerivedId(this, attributeName);
	}

	@Override
	public void toString(StringBuilder sb) {
		sb.append(this.getPersistentType().getName());
	}


	// ********** tables **********

	public String getPrimaryTableName() {
		return null;
	}

	public Table getPrimaryDbTable() {
		return null;
	}

	public Table resolveDbTable(String tableName) {
		return null;
	}

	public Schema getDbSchema() {
		return null;
	}


	// ********** attribute mappings **********

	public boolean attributeMappingKeyAllowed(String attributeMappingKey) {
		return true;
	}

	public Iterable<AttributeMapping> getAttributeMappings() {
		return new TransformationIterable<OrmReadOnlyPersistentAttribute, AttributeMapping>(this.getPersistentType().getAttributes()) {
			@Override
			protected AttributeMapping transform(OrmReadOnlyPersistentAttribute attribute) {
				return attribute.getMapping();
			}
		};
	}

	public Iterable<AttributeMapping> getAllAttributeMappings() {
		return new CompositeIterable<AttributeMapping>(this.getAllAttributeMappingsLists());
	}

	protected Iterable<Iterable<AttributeMapping>> getAllAttributeMappingsLists() {
		return new TransformationIterable<TypeMapping, Iterable<AttributeMapping>>(this.getInheritanceHierarchy(), TypeMappingTools.ATTRIBUTE_MAPPINGS_TRANSFORMER);
	}

	public Iterable<String> getOverridableAttributeNames() {
		return new CompositeIterable<String>(this.getOverridableAttributeNamesLists());
	}

	protected Iterable<Iterable<String>> getOverridableAttributeNamesLists() {
		return new TransformationIterable<AttributeMapping, Iterable<String>>(this.getAttributeMappings(), AttributeMappingTools.ALL_OVERRIDABLE_ATTRIBUTE_MAPPING_NAMES_TRANSFORMER);
	}

	public Iterable<String> getAllOverridableAttributeNames() {
		return new CompositeIterable<String>(this.getAllOverridableAttributeNamesLists());
	}

	protected Iterable<Iterable<String>> getAllOverridableAttributeNamesLists() {
		return new TransformationIterable<TypeMapping, Iterable<String>>(this.getInheritanceHierarchy(), TypeMappingTools.OVERRIDABLE_ATTRIBUTE_NAMES_TRANSFORMER);
	}

	public Iterable<AttributeMapping> getAttributeMappings(final String mappingKey) {
		return new FilteringIterable<AttributeMapping>(CollectionTools.collection(this.getAttributeMappings())) {
			@Override
			protected boolean accept(AttributeMapping o) {
				return Tools.valuesAreEqual(o.getKey(), mappingKey);
			}
		};
	}

	public Iterable<AttributeMapping> getAllAttributeMappings(final String mappingKey) {
		return new FilteringIterable<AttributeMapping>(CollectionTools.collection(this.getAllAttributeMappings())) {
			@Override
			protected boolean accept(AttributeMapping o) {
				return Tools.valuesAreEqual(o.getKey(), mappingKey);
			}
		};
	}

	public Iterable<AttributeMapping> getNonTransientAttributeMappings() {
		return new FilteringIterable<AttributeMapping>(this.getAllAttributeMappings()) {
			@Override
			protected boolean accept(AttributeMapping attributeMapping) {
				return (attributeMapping.getKey() != MappingKeys.TRANSIENT_ATTRIBUTE_MAPPING_KEY);
			}
		};
	}

	public Column resolveOverriddenColumn(String attributeName) {
		for (AttributeMapping attributeMapping : this.getAttributeMappings()) {
			Column column = attributeMapping.resolveOverriddenColumn(attributeName);
			if (column != null) {
				return column;
			}
		}
		if ( ! this.isMetadataComplete()) {
			JavaPersistentType javaPersistentType = this.getJavaPersistentType();
			if (javaPersistentType != null) {
				return javaPersistentType.getMapping().resolveOverriddenColumn(attributeName);
			}
		}
		return null;
	}

	public Iterable<String> getOverridableAssociationNames() {
		return new CompositeIterable<String>(this.getOverridableAssociationNamesLists());
	}

	protected Iterable<Iterable<String>> getOverridableAssociationNamesLists() {
		return new TransformationIterable<AttributeMapping, Iterable<String>>(this.getAttributeMappings(), AttributeMappingTools.ALL_OVERRIDABLE_ASSOCIATION_MAPPING_NAMES_TRANSFORMER);
	}

	public Iterable<String> getAllOverridableAssociationNames() {
		return new CompositeIterable<String>(this.getAllOverridableAssociationNamesLists());
	}

	protected Iterable<Iterable<String>> getAllOverridableAssociationNamesLists() {
		return new TransformationIterable<TypeMapping, Iterable<String>>(this.getInheritanceHierarchy(), TypeMappingTools.OVERRIDABLE_ASSOCIATION_NAMES_TRANSFORMER);
	}

	public Relationship resolveOverriddenRelationship(String attributeName) {
		for (AttributeMapping attributeMapping : this.getAttributeMappings()) {
			Relationship relationship = attributeMapping.resolveOverriddenRelationship(attributeName);
			if (relationship != null) {
				return relationship;
			}
		}
		if ( ! this.isMetadataComplete()) {
			JavaPersistentType javaPersistentType = this.getJavaPersistentType();
			if (javaPersistentType != null) {
				return javaPersistentType.getMapping().resolveOverriddenRelationship(attributeName);
			}
		}
		return null;
	}


	// ********** inheritance hierarchy **********

	public TypeMapping getSuperTypeMapping() {
		PersistentType superPersistentType = this.getPersistentType().getSuperPersistentType();
		return (superPersistentType == null) ? null : superPersistentType.getMapping();
	}

	public Iterable<TypeMapping> getInheritanceHierarchy() {
		return this.convertToMappings(this.getPersistentType().getInheritanceHierarchy());
	}

	/**
	 * Return the type mapping's "persistence" ancestors,
	 * <em>excluding</em> the type mapping itself.
	 * The returned iterator will return elements infinitely if the hierarchy
	 * has a loop.
	 */
	protected Iterable<TypeMapping> getAncestors() {
		return this.convertToMappings(this.getPersistentType().getAncestors());
	}

	protected Iterable<TypeMapping> convertToMappings(Iterable<PersistentType> types) {
		return new TransformationIterable<PersistentType, TypeMapping>(types) {
			@Override
			protected TypeMapping transform(PersistentType type) {
				return type.getMapping();
			}
		};
	}

	public InheritanceType getInheritanceStrategy() {
		return null;
	}

	public boolean isRootEntity() {
		return false;
	}

	public Entity getRootEntity() {
		return null;
	}

	// ********** text ranges **********

	public JpaStructureNode getStructureNode(int offset) {
		return this.xmlTypeMapping.containsOffset(offset) ? this.getPersistentType() : null;
	}

	public TextRange getSelectionTextRange() {
		return this.xmlTypeMapping.getSelectionTextRange();
	}

	public TextRange getClassTextRange() {
		return this.getValidationTextRange(this.xmlTypeMapping.getClassTextRange());
	}

	public TextRange getAttributesTextRange() {
		return this.getValidationTextRange(this.xmlTypeMapping.getAttributesTextRange());
	}

	public TextRange getNameTextRange() {
		return this.getValidationTextRange(this.xmlTypeMapping.getNameTextRange());
	}
	
	public boolean containsOffset(int textOffset) {
		return this.xmlTypeMapping.containsOffset(textOffset);
	}


	// ********** refactoring **********

	public DeleteEdit createDeleteEdit() {
		return this.xmlTypeMapping.createDeleteEdit();
	}

	public Iterable<ReplaceEdit> createRenameTypeEdits(IType originalType, String newName) {
		return this.getPersistentType().isFor(originalType.getFullyQualifiedName('.')) ?
				new SingleElementIterable<ReplaceEdit>(this.createRenameTypeEdit(originalType, newName)) :
				EmptyIterable.<ReplaceEdit>instance();
	}

	protected ReplaceEdit createRenameTypeEdit(IType originalType, String newName) {
		return this.xmlTypeMapping.createRenameTypeEdit(originalType, newName);
	}

	public Iterable<ReplaceEdit> createMoveTypeEdits(IType originalType, IPackageFragment newPackage) {
		return this.getPersistentType().isFor(originalType.getFullyQualifiedName('.')) ?
				new SingleElementIterable<ReplaceEdit>(this.createRenamePackageEdit(newPackage.getElementName())) :
				EmptyIterable.<ReplaceEdit>instance();
	}

	public Iterable<ReplaceEdit> createRenamePackageEdits(IPackageFragment originalPackage, String newName) {
		return this.getPersistentType().isIn(originalPackage) ?
				new SingleElementIterable<ReplaceEdit>(this.createRenamePackageEdit(newName)) :
				EmptyIterable.<ReplaceEdit>instance();
	}

	protected ReplaceEdit createRenamePackageEdit(String newName) {
		return this.xmlTypeMapping.createRenamePackageEdit(newName);
	}


	// ********** generators **********

	public Iterable<Generator> getGenerators() {
		return new CompositeIterable<Generator>(this.getAttributeMappingGeneratorLists());
	}

	protected Iterable<Iterable<Generator>> getAttributeMappingGeneratorLists() {
		return new TransformationIterable<AttributeMapping, Iterable<Generator>>(this.getAttributeMappings()) {
					@Override
					protected Iterable<Generator> transform(AttributeMapping attributeMapping) {
						return attributeMapping.getGenerators();
					}
				};
	}


	// ********** validation **********

	@Override
	public void validate(List<IMessage> messages, IReporter reporter) {
		super.validate(messages, reporter);
		this.validateClass(messages, reporter);
	}

	protected void validateClass(List<IMessage> messages, IReporter reporter) {
		if (StringTools.stringIsEmpty(this.class_)) {
			messages.add(
				DefaultJpaValidationMessages.buildMessage(
					IMessage.HIGH_SEVERITY,
					JpaValidationMessages.PERSISTENT_TYPE_UNSPECIFIED_CLASS,
					this,
					this.getClassTextRange()
				)
			);
			return;
		}
		this.buildTypeMappingValidator().validate(messages, reporter);
	}

	protected JptValidator buildTypeMappingValidator() {
		return new GenericTypeMappingValidator(this, this.getJavaResourceType(), this.buildTextRangeResolver());
	}

	protected TypeMappingTextRangeResolver buildTextRangeResolver() {
		return new OrmTypeMappingTextRangeResolver(this);
	}

	public boolean validatesAgainstDatabase() {
		return this.getPersistenceUnit().validatesAgainstDatabase();
	}

	public TextRange getValidationTextRange() {
		// this should never be null; also, the persistent type delegates
		// to here, so don't delegate back to it (or we will get a stack overflow)  bug 355415
		TextRange textRange = this.xmlTypeMapping.getValidationTextRange();
		//*return an Empty text range because validation sometimes run concurrently
		//with the code adding the type mapping to xml; the IDOMNode might not
		//be set when this is called. Brian's batch update changes in 3.2 should
		//fix this problem.  bug 358745
		return (textRange != null) ? textRange : TextRange.Empty.instance();
	}

	// ********** completion proposals **********

	@Override
	public Iterable<String> getXmlCompletionProposals(int pos) {
		Iterable<String> result = super.getXmlCompletionProposals(pos);
		if (result != null) {
			return result;
		}
		if (this.classNameTouches(pos)) {
			return this.getCandidateClassNames();
		}
		return null;
	}

	private Iterable<String> getCandidateClassNames() {
		final String packageName = this.getEntityMappings().getPackage();
		if (!StringTools.stringIsEmpty(packageName)) {
			return new TransformationIterable<String, String>(this.getFilteredCandidateClassNames(packageName)) {
				@Override
				protected String transform(String className) {
					return className.substring(packageName.length()+1);
				}
			};
		}
		return this.getCandidateFullQulifiedClassNames();
	}
	
	private Iterable<String> getFilteredCandidateClassNames(final String packageName) {
			return new FilteringIterable<String>(this.getCandidateFullQulifiedClassNames()) {
				@Override
				protected boolean accept(String className) {
					return className.startsWith(packageName);
				}
			};
	}

	/**
	 * @return names of the classes specified by class refs and jar files
	 */
	// should return names of all the classes defined in the project?
	private Iterable<String> getCandidateFullQulifiedClassNames() {
		return new TransformationIterable<PersistentType, String>(
				this.getPersistenceUnit().getJavaPersistentTypes()) {
			@Override
			protected String transform(PersistentType pType) {
				return pType.getName();
			}
		};
	}

	private boolean classNameTouches(int pos) {
		return this.getXmlTypeMapping().classNameTouches(pos);
	}
}