/*******************************************************************************
 * Copyright (c) 2011 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.eclipselink.core.internal.context.orm;

import java.util.List;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.IPackageFragment;
import org.eclipse.jdt.core.IType;
import org.eclipse.jpt.common.core.internal.utility.JDTTools;
import org.eclipse.jpt.common.core.resource.java.JavaResourceAbstractType;
import org.eclipse.jpt.common.core.utility.TextRange;
import org.eclipse.jpt.common.utility.internal.StringTools;
import org.eclipse.jpt.common.utility.internal.iterables.EmptyIterable;
import org.eclipse.jpt.common.utility.internal.iterables.SingleElementIterable;
import org.eclipse.jpt.jpa.core.context.XmlContextNode;
import org.eclipse.jpt.jpa.eclipselink.core.context.EclipseLinkConverterClassConverter;
import org.eclipse.jpt.jpa.eclipselink.core.internal.DefaultEclipseLinkJpaValidationMessages;
import org.eclipse.jpt.jpa.eclipselink.core.internal.EclipseLinkJpaValidationMessages;
import org.eclipse.jpt.jpa.eclipselink.core.resource.orm.XmlNamedConverter;
import org.eclipse.text.edits.ReplaceEdit;
import org.eclipse.wst.validation.internal.provisional.core.IMessage;
import org.eclipse.wst.validation.internal.provisional.core.IReporter;

public abstract class OrmEclipseLinkConverterClassConverter<X extends XmlNamedConverter>
	extends OrmEclipseLinkConverter<X>
	implements EclipseLinkConverterClassConverter
{
	private String converterClass;

	protected JavaResourceAbstractType converterResourceType;


	public OrmEclipseLinkConverterClassConverter(XmlContextNode parent, X xmlConverter, String converterClass) {
		super(parent, xmlConverter);
		this.converterClass = converterClass;
	}


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

	@Override
	public void synchronizeWithResourceModel() {
		super.synchronizeWithResourceModel();
		this.setConverterClass_(this.getXmlConverterClass());
	}


	// ********** converter class **********

	public String getConverterClass() {
		return this.converterClass;
	}

	public void setConverterClass(String converterClass) {
		this.setConverterClass_(converterClass);
		this.setXmlConverterClass(converterClass);
	}

	protected void setConverterClass_(String newConverterClass) {
		String oldConverterClass = this.converterClass;
		this.converterClass = newConverterClass;
		this.firePropertyChanged(CONVERTER_CLASS_PROPERTY, oldConverterClass, newConverterClass);
	}

	protected JavaResourceAbstractType getConverterJavaResourceType() {
		return this.getMappingFileRoot().resolveJavaResourceType(this.converterClass);
	}

	protected abstract String getXmlConverterClass();

	protected abstract void setXmlConverterClass(String converterClass);


	// ********** resource interaction **********

	protected void updateConverterResourceType() {
		this.converterResourceType = this.getConverterJavaResourceType();
	}


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

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

	protected void validateConverterClass(List<IMessage> messages) {
		if (StringTools.stringIsEmpty(this.converterClass)) {
			messages.add(
				DefaultEclipseLinkJpaValidationMessages.buildMessage(
					IMessage.HIGH_SEVERITY,
					EclipseLinkJpaValidationMessages.CONVERTER_CLASS_DEFINED,
					this,
					this.getConverterClassTextRange()
				)
			);
			return;
		}

		if ( ! this.converterClassExists()) {
			messages.add(
				DefaultEclipseLinkJpaValidationMessages.buildMessage(
					IMessage.HIGH_SEVERITY,
					EclipseLinkJpaValidationMessages.CONVERTER_CLASS_EXISTS,
					new String[] {this.converterClass},
					this,
					this.getConverterClassTextRange()
				)
			);
			return;
		}

		if ( ! this.converterClassImplementsInterface(this.getEclipseLinkConverterInterface())) {
			messages.add(
				DefaultEclipseLinkJpaValidationMessages.buildMessage(
					IMessage.HIGH_SEVERITY,
					this.getEclipseLinkConverterInterfaceErrorMessage(),
					new String[] {this.converterClass},
					this,
					this.getConverterClassTextRange()
				)
			);
		}
	}

	/**
	 * Return the name of the EclipseLink interface the converter class must
	 * implement.
	 */
	protected abstract String getEclipseLinkConverterInterface();

	protected abstract String getEclipseLinkConverterInterfaceErrorMessage();

	protected boolean converterClassExists() {
		return this.typeExists(this.converterClass) ||
				this.typeExists(this.getAlternateConverterClass());
	}

	/**
	 * Add <code>null</code> check.
	 */
	protected boolean typeExists(String typeName) {
		return (typeName != null) && 
				(JDTTools.findType(this.getJavaProject(), typeName) != null);
	}

	/**
	 * Add <code>null</code> check.
	 */
	protected boolean typeImplementsInterface(String typeName, String interfaceName) {
		return (typeName != null) && 
				JDTTools.typeIsSubType(this.getJavaProject(), typeName, interfaceName);
	}

	protected boolean converterClassImplementsInterface(String interfaceName) {
		return this.typeImplementsInterface(this.converterClass, interfaceName) ||
				this.typeImplementsInterface(this.getAlternateConverterClass(), interfaceName);
	}

	/**
	 * If present, append the mapping file package to the converter class and
	 * return it. Return <code>null</code> if the mapping file package is not
	 * specified.
	 */
	protected String getAlternateConverterClass() {
		String mappingFilePackage = this.getMappingFileRoot().getPackage();
		if (StringTools.stringIsEmpty(mappingFilePackage)) {
			return null;
		}
		return mappingFilePackage + '.' + this.converterClass;
	}

	protected TextRange getConverterClassTextRange() {
		return this.getValidationTextRange(this.getXmlConverterClassTextRange());
	}

	protected abstract TextRange getXmlConverterClassTextRange();

	protected IJavaProject getJavaProject() {
		return this.getJpaProject().getJavaProject();
	}


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

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

	protected abstract ReplaceEdit createRenameEdit(IType originalType, String newName);

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

	protected abstract ReplaceEdit createRenamePackageEdit(String newName);

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

	protected boolean isFor(String typeName) {
		JavaResourceAbstractType converterType = this.getConverterJavaResourceType();
		return (converterType != null) && converterType.getQualifiedName().equals(typeName);
	}

	protected boolean isIn(IPackageFragment packageFragment) {
		JavaResourceAbstractType converterType = this.getConverterJavaResourceType();
		return (converterType != null) && converterType.isIn(packageFragment);
	}
}