/*******************************************************************************
 * Copyright (c) 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.platform;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.jpt.core.internal.IAttributeMapping;
import org.eclipse.jpt.core.internal.IJpaPlatform;
import org.eclipse.jpt.core.internal.ITypeMapping;
import org.eclipse.jpt.core.internal.content.orm.XmlSingleRelationshipMapping;
import org.eclipse.jpt.core.internal.mappings.IJoinColumn;
import org.eclipse.jpt.core.internal.mappings.IMultiRelationshipMapping;
import org.eclipse.jpt.core.internal.mappings.IRelationshipMapping;
import org.eclipse.jpt.core.internal.mappings.ISingleRelationshipMapping;
import org.eclipse.jpt.core.internal.validation.IJpaValidationMessages;
import org.eclipse.jpt.core.internal.validation.JpaValidationMessages;
import org.eclipse.wst.validation.internal.provisional.core.IMessage;

public abstract class XmlSingleRelationshipMappingContext
	extends XmlRelationshipMappingContext
{
	private Collection<JoinColumnContext> joinColumnContexts;

	protected XmlSingleRelationshipMappingContext(
			IContext parentContext, XmlSingleRelationshipMapping mapping) {
		super(parentContext, mapping);
		this.joinColumnContexts = buildJoinColumnContexts();
	}
	
	protected Collection<JoinColumnContext> buildJoinColumnContexts() {
		Collection<JoinColumnContext> contexts = new ArrayList<JoinColumnContext>();
		for (Iterator<IJoinColumn> i = singleRelationshipMapping().getJoinColumns().iterator(); i.hasNext(); ) {
			contexts.add(new XmlJoinColumnContext(buildJoinColumnParentContext(), i.next()));
		}
		return contexts;
	}
	
	protected XmlJoinColumnContext.ParentContext buildJoinColumnParentContext() {
		return new XmlJoinColumnContext.ParentContext() {
			public void refreshDefaults(DefaultsContext defaults, IProgressMonitor monitor) {
				XmlSingleRelationshipMappingContext.this.refreshDefaults(defaults, monitor);
			}
		
			public IJpaPlatform getPlatform() {
				return XmlSingleRelationshipMappingContext.this.getPlatform();
			}
		
			public IContext getParentContext() {
				return XmlSingleRelationshipMappingContext.this.getParentContext();
			}
		
			public void addToMessages(List<IMessage> messages) {
				XmlSingleRelationshipMappingContext.this.addToMessages(messages);
			}
		
			public IJoinColumn javaJoinColumn(int index) {
				//if the mapping is specified in the xml, then nothing specified in java should be used
				if (relationshipMapping().isVirtual()) {
					return javaRelationshipMapping().getJoinColumns().get(index);
				}
				return null;
			}
		};
	}

	protected XmlSingleRelationshipMapping singleRelationshipMapping() {
		return (XmlSingleRelationshipMapping) relationshipMapping();
	}


	public ISingleRelationshipMapping javaRelationshipMapping() {
		IAttributeMapping javaAttributeMapping = javaAttributeMapping();
		if (javaAttributeMapping instanceof ISingleRelationshipMapping) {
			return ((ISingleRelationshipMapping) javaAttributeMapping);
		}
		return null;
	}

	public void refreshDefaults(DefaultsContext defaultsContext, IProgressMonitor monitor) {
		super.refreshDefaults(defaultsContext, monitor);
		for (JoinColumnContext context : this.joinColumnContexts) {
			context.refreshDefaults(defaultsContext, monitor);
		}
	}
	
	@Override
	protected Object getDefault(String key, DefaultsContext defaultsContext) {
		/**
		 * by default, the join column is in the type mapping's primary table
		 */
		if (key.equals(BaseJpaPlatform.DEFAULT_JOIN_COLUMN_TABLE_KEY)) {
			return singleRelationshipMapping().typeMapping().getTableName();
		}
		return super.getDefault(key, defaultsContext);
	}
	
	@Override
	public void addToMessages(List<IMessage> messages) {
		super.addToMessages(messages);
		
		//bug 192287 - do not want joinColumn validation errors on the non-owning side
		//of a bidirectional relationship.  This is a low risk fix for RC3, but a better
		//solution would be to not have the default joinColumns on the non-owning side.
		//This would fix another bug that we show default joinColumns in this situation.
		if (entityOwned() && isOwningSide()) {
			addJoinColumnMessages(messages);
		}
	}
	
	protected abstract boolean isOwningSide();
	

	protected void addJoinColumnMessages(List<IMessage> messages) {
		XmlSingleRelationshipMapping mapping = singleRelationshipMapping();
		ITypeMapping typeMapping = mapping.typeMapping();
		
		for (IJoinColumn joinColumn : mapping.getJoinColumns()) {
			String table = joinColumn.getTable();
			boolean doContinue = joinColumn.isConnected();
			
			if (doContinue && typeMapping.tableNameIsInvalid(table)) {
				if (mapping.isVirtual()) {
					messages.add(
						JpaValidationMessages.buildMessage(
							IMessage.HIGH_SEVERITY,
							IJpaValidationMessages.VIRTUAL_ATTRIBUTE_JOIN_COLUMN_UNRESOLVED_TABLE,
							new String[] {mapping.getPersistentAttribute().getName(), table, joinColumn.getName()},
							joinColumn, joinColumn.tableTextRange())
					);
				}
				else {
					messages.add(
						JpaValidationMessages.buildMessage(
							IMessage.HIGH_SEVERITY,
							IJpaValidationMessages.JOIN_COLUMN_UNRESOLVED_TABLE,
							new String[] {table, joinColumn.getName()}, 
							joinColumn, joinColumn.tableTextRange())
					);
				}
				doContinue = false;
			}
			
			if (doContinue && ! joinColumn.isResolved()) {
				if (mapping.isVirtual()) {
					messages.add(
						JpaValidationMessages.buildMessage(
							IMessage.HIGH_SEVERITY,
							IJpaValidationMessages.VIRTUAL_ATTRIBUTE_JOIN_COLUMN_UNRESOLVED_NAME,
							new String[] {mapping.getPersistentAttribute().getName(), joinColumn.getName()}, 
							joinColumn, joinColumn.nameTextRange())
					);
				}
				else {
					messages.add(
						JpaValidationMessages.buildMessage(
							IMessage.HIGH_SEVERITY,
							IJpaValidationMessages.JOIN_COLUMN_UNRESOLVED_NAME,
							new String[] {joinColumn.getName()}, 
							joinColumn, joinColumn.nameTextRange())
					);
				}
			}
			
			if (doContinue && ! joinColumn.isReferencedColumnResolved()) {
				if (mapping.isVirtual()) {
					messages.add(
						JpaValidationMessages.buildMessage(
							IMessage.HIGH_SEVERITY,
							IJpaValidationMessages.VIRTUAL_ATTRIBUTE_JOIN_COLUMN_REFERENCED_COLUMN_UNRESOLVED_NAME,
							new String[] {mapping.getPersistentAttribute().getName(), joinColumn.getReferencedColumnName(), joinColumn.getName()}, 
							joinColumn, joinColumn.referencedColumnNameTextRange())
					);
				}
				else {
					messages.add(
						JpaValidationMessages.buildMessage(
							IMessage.HIGH_SEVERITY,
							IJpaValidationMessages.JOIN_COLUMN_REFERENCED_COLUMN_UNRESOLVED_NAME,
							new String[] {joinColumn.getReferencedColumnName(), joinColumn.getName()}, 
							joinColumn, joinColumn.referencedColumnNameTextRange())
					);
				}
			}
		}
	}
}