/*******************************************************************************
 * 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.platform;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import org.eclipse.jpt.core.internal.IJpaFactory;
import org.eclipse.jpt.core.internal.IJpaFile;
import org.eclipse.jpt.core.internal.IJpaFileContentProvider;
import org.eclipse.jpt.core.internal.IJpaPlatform;
import org.eclipse.jpt.core.internal.IJpaProject;
import org.eclipse.jpt.core.internal.IMappingKeys;
import org.eclipse.jpt.core.internal.IPersistentType;
import org.eclipse.jpt.core.internal.content.java.IDefaultJavaAttributeMappingProvider;
import org.eclipse.jpt.core.internal.content.java.IJavaAttributeMapping;
import org.eclipse.jpt.core.internal.content.java.IJavaAttributeMappingProvider;
import org.eclipse.jpt.core.internal.content.java.IJavaTypeMapping;
import org.eclipse.jpt.core.internal.content.java.IJavaTypeMappingProvider;
import org.eclipse.jpt.core.internal.content.java.JavaJpaFileContentProvider;
import org.eclipse.jpt.core.internal.content.java.mappings.JavaBasic;
import org.eclipse.jpt.core.internal.content.java.mappings.JavaBasicProvider;
import org.eclipse.jpt.core.internal.content.java.mappings.JavaEmbeddable;
import org.eclipse.jpt.core.internal.content.java.mappings.JavaEmbeddableProvider;
import org.eclipse.jpt.core.internal.content.java.mappings.JavaEmbedded;
import org.eclipse.jpt.core.internal.content.java.mappings.JavaEmbeddedId;
import org.eclipse.jpt.core.internal.content.java.mappings.JavaEmbeddedIdProvider;
import org.eclipse.jpt.core.internal.content.java.mappings.JavaEmbeddedProvider;
import org.eclipse.jpt.core.internal.content.java.mappings.JavaEntity;
import org.eclipse.jpt.core.internal.content.java.mappings.JavaEntityProvider;
import org.eclipse.jpt.core.internal.content.java.mappings.JavaId;
import org.eclipse.jpt.core.internal.content.java.mappings.JavaIdProvider;
import org.eclipse.jpt.core.internal.content.java.mappings.JavaManyToMany;
import org.eclipse.jpt.core.internal.content.java.mappings.JavaManyToManyProvider;
import org.eclipse.jpt.core.internal.content.java.mappings.JavaManyToOne;
import org.eclipse.jpt.core.internal.content.java.mappings.JavaManyToOneProvider;
import org.eclipse.jpt.core.internal.content.java.mappings.JavaMappedSuperclass;
import org.eclipse.jpt.core.internal.content.java.mappings.JavaMappedSuperclassProvider;
import org.eclipse.jpt.core.internal.content.java.mappings.JavaNullAttributeMapping;
import org.eclipse.jpt.core.internal.content.java.mappings.JavaNullTypeMapping;
import org.eclipse.jpt.core.internal.content.java.mappings.JavaNullTypeMappingProvider;
import org.eclipse.jpt.core.internal.content.java.mappings.JavaOneToMany;
import org.eclipse.jpt.core.internal.content.java.mappings.JavaOneToManyProvider;
import org.eclipse.jpt.core.internal.content.java.mappings.JavaOneToOne;
import org.eclipse.jpt.core.internal.content.java.mappings.JavaOneToOneProvider;
import org.eclipse.jpt.core.internal.content.java.mappings.JavaTransient;
import org.eclipse.jpt.core.internal.content.java.mappings.JavaTransientProvider;
import org.eclipse.jpt.core.internal.content.java.mappings.JavaVersion;
import org.eclipse.jpt.core.internal.content.java.mappings.JavaVersionProvider;
import org.eclipse.jpt.core.internal.content.orm.OrmXmlJpaFileContentProvider;
import org.eclipse.jpt.core.internal.content.persistence.PersistenceUnit;
import org.eclipse.jpt.core.internal.content.persistence.PersistenceXmlJpaFileContentProvider;
import org.eclipse.jpt.utility.internal.iterators.CloneIterator;
import org.eclipse.jpt.utility.internal.iterators.CloneListIterator;
import org.eclipse.jpt.utility.internal.iterators.EmptyIterator;
import org.eclipse.wst.validation.internal.provisional.core.IMessage;

public abstract class BaseJpaPlatform implements IJpaPlatform
{
	public static final String DEFAULT_TABLE_SCHEMA_KEY = "table.schema";
	public static final String DEFAULT_TABLE_CATALOG_KEY = "table.catalog";
	public static final String DEFAULT_TABLE_NAME_KEY = "table.name";
	public static final String DEFAULT_ACCESS_KEY = "access";
	public static final String DEFAULT_ENTITY_NAME_KEY = "entity.name";
	public static final String DEFAULT_COLUMN_TABLE_KEY = "column.table";
	public static final String DEFAULT_COLUMN_NAME_KEY = "column.name";
	public static final String DEFAULT_JOIN_TABLE_NAME_KEY = "joinTable.name";
	public static final String DEFAULT_TARGET_ENTITY_KEY = "oneToMany.targetEntity";
	public static final String DEFAULT_JOIN_COLUMN_TABLE_KEY = "joinColumn.table";
	public static final String DEFAULT_JOIN_COLUMN_NAME_KEY = "joinColumn.name";
	public static final String DEFAULT_JOIN_COLUMN_REFERENCED_COLUMN_NAME_KEY = "joinColumn.referencedColumnName";
	public static final String DEFAULT_TABLE_GENERATOR_SCHEMA_KEY = "tableGenerator.schema";
	
	private String id;
	
	protected IJpaProject project;
	
	private Collection<IJpaFileContentProvider> contentProviders;
	
	private Collection<IJavaAttributeMappingProvider> javaAttributeMappingProviders;
	
	private List<IDefaultJavaAttributeMappingProvider> defaultJavaAttributeMappingProviders;
		
	private Collection<IJavaTypeMappingProvider> javaTypeMappingProviders;
	
	private IJpaFactory jpaFactory;
	
	private IContext context;
	
	protected BaseJpaPlatform() {
		super();
		this.jpaFactory = createJpaFactory();
	}
	
	protected abstract IJpaFactory createJpaFactory();
	
	public String getId() {
		return this.id;
	}
	
	/**
	 * *************
	 * * IMPORTANT *   For INTERNAL use only !!
	 * *************
	 * 
	 * @see IJpaPlatform#setId(String)
	 */
	public void setId(String theId) {
		this.id = theId;
	}
	
	public IJpaProject getProject() {
		return this.project;
	}
	
	public void setProject(IJpaProject jpaProject) {
		this.project = jpaProject;
	}

	public IJpaFactory getJpaFactory() {
		return this.jpaFactory;
	}
	
	// ********** Persistence Unit ********************************************

	public boolean containsPersistenceUnitNamed(String name) {
		return ((BaseJpaProjectContext)this.context).containsPersistenceUnitNamed(name);
	}
	
	public PersistenceUnit persistenceUnitNamed(String name) {
		return ((BaseJpaProjectContext)this.context).persistenceUnitNamed(name);
	}
	
	public Iterator<PersistenceUnit> persistenceUnits() {
		return ((BaseJpaProjectContext)this.context).persistenceUnits();
	}
	
	public int persistenceUnitSize() {
		return ((BaseJpaProjectContext)this.context).persistenceUnitContextsSize();
	}

	
	// ********** Persistent Types ********************************************

	public Iterator<IPersistentType> persistentTypes(String persistenceUnitName) {
		PersistenceUnitContext puContext = 
			((BaseJpaProjectContext) this.context).persistenceUnitContext(persistenceUnitName);
		if (puContext == null) {
			return EmptyIterator.instance();
		}
		return puContext.persistentTypes();
		//hmm, compiler error with ternary operator
//		return (puContext == null) ? EmptyIterator.instance() : puContext.persistentTypes();
	}
	
	
	// ************************************************************************
	
	public Iterator<IJpaFileContentProvider> jpaFileContentProviders() {
		if (this.contentProviders == null) {
			this.contentProviders = new ArrayList<IJpaFileContentProvider>();
			addJpaFileContentProvidersTo(this.contentProviders);
		}
		return new CloneIterator<IJpaFileContentProvider>(this.contentProviders);
	}
	
	public IJpaFileContentProvider fileContentProvider(String contentTypeId) {
		for (Iterator<IJpaFileContentProvider> i = this.jpaFileContentProviders(); i.hasNext(); ) {
			IJpaFileContentProvider provider = i.next();
			if (provider.contentType().equals(contentTypeId)) {
				return provider;
			}
		}
		return null;
	}

	/**
	 * Override this to specify more or different JPA file content providers.
	 * The default includes the JPA spec-defined content providers of
	 * persistence.xml, orm.xml, and java files.
	 */
	protected void addJpaFileContentProvidersTo(Collection<IJpaFileContentProvider> providers) {
		providers.add(PersistenceXmlJpaFileContentProvider.instance());
		providers.add(JavaJpaFileContentProvider.instance());
		providers.add(OrmXmlJpaFileContentProvider.instance());
	}
	
	public Iterator<IJavaTypeMappingProvider> javaTypeMappingProviders() {
		if (this.javaTypeMappingProviders == null) {
			this.javaTypeMappingProviders = new ArrayList<IJavaTypeMappingProvider>();
			this.addJavaTypeMappingProvidersTo(this.javaTypeMappingProviders);
		}
		return new CloneIterator<IJavaTypeMappingProvider>(this.javaTypeMappingProviders);
	}

	/**
	 * Override this to specify more or different type mapping providers.
	 * The default includes the JPA spec-defined type mappings of 
	 * Entity, MappedSuperclass, and Embeddable
	 */
	protected void addJavaTypeMappingProvidersTo(Collection<IJavaTypeMappingProvider> providers) {
		providers.add(JavaNullTypeMappingProvider.instance());
		providers.add(JavaEntityProvider.instance());
		providers.add(JavaMappedSuperclassProvider.instance());
		providers.add(JavaEmbeddableProvider.instance());
	}

	public IJavaTypeMappingProvider javaTypeMappingProvider(String typeMappingKey) {
		for (Iterator<IJavaTypeMappingProvider> i = this.javaTypeMappingProviders(); i.hasNext(); ) {
			IJavaTypeMappingProvider provider = i.next();
			if (provider.key() == typeMappingKey) {
				return provider;
			}
		}
		throw new IllegalArgumentException("Unsupported java type mapping key: " + typeMappingKey);
	}
	
	public Iterator<IJavaAttributeMappingProvider> javaAttributeMappingProviders() {
		if (this.javaAttributeMappingProviders == null) {
			this.javaAttributeMappingProviders = new ArrayList<IJavaAttributeMappingProvider>();
			this.addJavaAttributeMappingProvidersTo(this.javaAttributeMappingProviders);
		}
		return new CloneIterator<IJavaAttributeMappingProvider>(this.javaAttributeMappingProviders);
	}
	
	/**
	 * Override this to specify more or different attribute mapping providers.
	 * The default includes the JPA spec-defined attribute mappings of 
	 * Basic, Id, Transient OneToOne, OneToMany, ManyToOne, ManyToMany, Embeddable, EmbeddedId, Version.
	 */
	protected void addJavaAttributeMappingProvidersTo(Collection<IJavaAttributeMappingProvider> providers) {
		providers.add(JavaBasicProvider.instance());
		providers.add(JavaIdProvider.instance());
		providers.add(JavaTransientProvider.instance());
		providers.add(JavaOneToManyProvider.instance());
		providers.add(JavaManyToOneProvider.instance());
		providers.add(JavaManyToManyProvider.instance());
		providers.add(JavaOneToOneProvider.instance());
		providers.add(JavaEmbeddedProvider.instance());
		providers.add(JavaEmbeddedIdProvider.instance());
		providers.add(JavaVersionProvider.instance());
	}
	
	/**
	 * throw an exception if the provider is not found
	 */
	public IJavaAttributeMappingProvider javaAttributeMappingProvider(String attributeMappingKey) {
		for (Iterator<IJavaAttributeMappingProvider> i = this.javaAttributeMappingProviders(); i.hasNext(); ) {
			IJavaAttributeMappingProvider provider = i.next();
			if (provider.key() == attributeMappingKey) {
				return provider;
			}
		}
		throw new IllegalArgumentException("Unsupported java attribute mapping key: " + attributeMappingKey);
	}
	
	public ListIterator<IDefaultJavaAttributeMappingProvider> defaultJavaAttributeMappingProviders() {
		if (this.defaultJavaAttributeMappingProviders == null) {
			this.defaultJavaAttributeMappingProviders = new ArrayList<IDefaultJavaAttributeMappingProvider>();
			this.addDefaultAttributeMappingProvidersTo(this.defaultJavaAttributeMappingProviders);
		}
		return new CloneListIterator<IDefaultJavaAttributeMappingProvider>(this.defaultJavaAttributeMappingProviders);
	}
	
	/**
	 * Override this to specify more or different default attribute mapping providers.
	 * The default includes the JPA spec-defined attribute mappings of 
	 * Embedded and Basic.
	 */
	protected void addDefaultAttributeMappingProvidersTo(List<IDefaultJavaAttributeMappingProvider> providers) {
		providers.add(JavaEmbeddedProvider.instance()); //bug 190344 need to test default embedded before basic
		providers.add(JavaBasicProvider.instance());
	}

	public IContext buildProjectContext() {
		this.context = new BaseJpaProjectContext(getProject());
		return this.context;
	}
	
	public Iterator<IJpaFile> validPersistenceXmlFiles(){
		return ((BaseJpaProjectContext)this.context).validPersistenceXmlFiles();
	}
	
	public IContext buildJavaTypeContext(IContext parentContext, IJavaTypeMapping typeMapping) {
		String key = typeMapping.getKey();
		if (key == IMappingKeys.ENTITY_TYPE_MAPPING_KEY) {
			return new JavaEntityContext(parentContext, (JavaEntity) typeMapping);
		}
		else if (key == IMappingKeys.EMBEDDABLE_TYPE_MAPPING_KEY) {
			return new JavaEmbeddableContext(parentContext, (JavaEmbeddable) typeMapping);
		}
		else if (key == IMappingKeys.MAPPED_SUPERCLASS_TYPE_MAPPING_KEY) {
			return new JavaMappedSuperclassContext(parentContext, (JavaMappedSuperclass) typeMapping);
		}
		else if (key == null) {
			return new JavaNullTypeMappingContext(parentContext, (JavaNullTypeMapping) typeMapping);
		}
		else {
			throw new IllegalArgumentException(typeMapping.toString());
		}
	}
	
	public IContext buildJavaAttributeContext(IContext parentContext, IJavaAttributeMapping attributeMapping) {
		String key = attributeMapping.getKey();
		if (key == IMappingKeys.BASIC_ATTRIBUTE_MAPPING_KEY) {
			return new JavaBasicContext(parentContext, (JavaBasic) attributeMapping);
		}
		else if (key == IMappingKeys.ID_ATTRIBUTE_MAPPING_KEY) {
			return new JavaIdContext(parentContext, (JavaId) attributeMapping);
		}
		else if (key == IMappingKeys.VERSION_ATTRIBUTE_MAPPING_KEY) {
			return new JavaVersionContext(parentContext, (JavaVersion) attributeMapping);
		}
		else if (key == IMappingKeys.EMBEDDED_ATTRIBUTE_MAPPING_KEY) {
			return new JavaEmbeddedContext(parentContext, (JavaEmbedded) attributeMapping);
		}
		else if (key == IMappingKeys.EMBEDDED_ID_ATTRIBUTE_MAPPING_KEY) {
			return new JavaEmbeddedIdContext(parentContext, (JavaEmbeddedId) attributeMapping);
		}
		else if (key == IMappingKeys.ONE_TO_ONE_ATTRIBUTE_MAPPING_KEY) {
			return new JavaOneToOneContext(parentContext, (JavaOneToOne) attributeMapping);
		}
		else if (key == IMappingKeys.ONE_TO_MANY_ATTRIBUTE_MAPPING_KEY) {
			return new JavaOneToManyContext(parentContext, (JavaOneToMany) attributeMapping);
		}
		else if (key == IMappingKeys.MANY_TO_ONE_ATTRIBUTE_MAPPING_KEY) {
			return new JavaManyToOneContext(parentContext, (JavaManyToOne) attributeMapping);
		}
		else if (key == IMappingKeys.MANY_TO_MANY_ATTRIBUTE_MAPPING_KEY) {
			return new JavaManyToManyContext(parentContext, (JavaManyToMany) attributeMapping);
		}
		else if (key == IMappingKeys.TRANSIENT_ATTRIBUTE_MAPPING_KEY) {
			return new JavaTransientContext(parentContext, (JavaTransient) attributeMapping);
		}
		else if (key == null) {
			return new JavaNullAttributeMappingContext(parentContext, (JavaNullAttributeMapping) attributeMapping);
		}
		else {
			throw new IllegalArgumentException(attributeMapping.toString());
		}
	}
	
	public void resynch(IContext contextHierarchy) {
		((BaseJpaProjectContext) contextHierarchy).refreshDefaults();
	}
	
	public void addToMessages(List<IMessage> messages) {
		BaseJpaProjectContext context = (BaseJpaProjectContext) buildProjectContext();
		context.refreshDefaults();
		context.addToMessages(messages);
	}
	
//	public IGeneratorRepository generatorRepository(IPersistentType persistentType) {
//		return ((BaseJpaProjectContext) context).generatorRepository(persistentType);
//	}
}