/*******************************************************************************
 * Copyright (c) 2003, 2007 IBM Corporation and others.
 * 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.jst.j2ee.componentcore;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jst.common.jdt.internal.integration.JavaArtifactEditModel;
import org.eclipse.jst.common.jdt.internal.integration.WorkingCopyManager;
import org.eclipse.jst.common.jdt.internal.integration.WorkingCopyProvider;
import org.eclipse.jst.j2ee.commonarchivecore.internal.Archive;
import org.eclipse.jst.j2ee.commonarchivecore.internal.exception.OpenFailureException;
import org.eclipse.jst.j2ee.internal.project.J2EEProjectUtilities;
import org.eclipse.jst.j2ee.model.IModelProvider;
import org.eclipse.jst.j2ee.model.IModelProviderFactory;
import org.eclipse.jst.j2ee.model.IModelProviderListener;
import org.eclipse.wst.common.componentcore.ArtifactEdit;
import org.eclipse.wst.common.componentcore.ModuleCoreNature;
import org.eclipse.wst.common.componentcore.internal.ArtifactEditModel;
import org.eclipse.wst.common.componentcore.internal.impl.ModuleURIUtil;
import org.eclipse.wst.common.componentcore.resources.IVirtualComponent;
import org.eclipse.wst.common.internal.emfworkbench.integration.EditModelListener;
import org.eclipse.wst.common.project.facet.core.IFacetedProject;
import org.eclipse.wst.common.project.facet.core.ProjectFacetsManager;

/**
 * <p>
 * EnterpriseArtifactEdit obtains a type-specific J2EE metamodel from the managed
 * {@see org.eclipse.wst.common.modulecore.ArtifactEditModel}. The underlying EditModel maintains
 * {@see org.eclipse.emf.ecore.resource.Resource}s, such as the J2EE deployment descriptor
 * resource. The defined methods extract data or manipulate the contents of the underlying resource.
 * </p>
 * 
 * <p>
 * This class is an abstract class, and clients are intended to subclass and own their
 * implementation.
 * </p>
 */
public abstract class EnterpriseArtifactEdit extends ArtifactEdit implements WorkingCopyProvider, IModelProvider, IModelProviderFactory {

	public static boolean SUPPORT_LEGACY_PROJECTS = true;
	private ArtifactEdit writableEdit =  null; 
	
	/**
	 * 
	 */
	protected EnterpriseArtifactEdit() {
		super();
	}

	public EnterpriseArtifactEdit(IVirtualComponent aModule){
		super(aModule);
	}
	
	
	/**
	 * @param aHandle
	 * @param toAccessAsReadOnly
	 * @throws IllegalArgumentException
	 */
	public EnterpriseArtifactEdit(IProject aProject, boolean toAccessAsReadOnly) throws IllegalArgumentException {
		super(aProject, toAccessAsReadOnly);
	}
	
	/**
	 * @param aHandle
	 * @param toAccessAsReadOnly
	 * @throws IllegalArgumentException
	 */
	protected EnterpriseArtifactEdit(IProject aProject, boolean toAccessAsReadOnly, boolean forCreate, String projectType) throws IllegalArgumentException {
		super(aProject, toAccessAsReadOnly, forCreate, projectType);
	}

	/**
	 * <p>
	 * Creates an instance facade for the given {@see ArtifactEditModel}.
	 * </p>
	 * <p>
	 * Clients that use this constructor are required to release their access of the EditModel when
	 * finished. Calling {@see ArtifactEdit#dispose()}will not touch the supplied EditModel.
	 * </p>
	 * 
	 * @param anArtifactEditModel
	 *            A valid, properly-accessed EditModel
	 */
	public EnterpriseArtifactEdit(ArtifactEditModel model) {
		super(model);
	}

	/**
	 * <p>
	 * Creates an instance facade for the given {@see WorkbenchComponent}.
	 * </p>
	 * <p>
	 * Instances of EnterpriseArtifactEdit that are returned through this method must be
	 * {@see #dispose()}ed of when no longer in use.
	 * </p>
	 * <p>
	 * Note: This method is for internal use only. Clients should not call this method.
	 * </p>
	 * 
	 * @param aNature
	 *            A non-null {@see ModuleCoreNature}&nbsp;for an accessible project
	 * @param aModule
	 *            A non-null {@see WorkbenchComponent}&nbsp;pointing to a module from the given
	 *            {@see ModuleCoreNature}
	 */

	protected EnterpriseArtifactEdit(ModuleCoreNature aNature, IVirtualComponent aModule, boolean toAccessAsReadOnly) {
		super(aNature, aModule, toAccessAsReadOnly);
	}

	/**
	 * <p>
	 * Retrieves J2EE version information from deployment descriptor resource.
	 * </p>
	 * 
	 * @return An the J2EE Specification version of the underlying {@see WorkbenchComponent}
	 * 
	 */
	public abstract int getJ2EEVersion();

	/**
	 * <p>
	 * Retrieves a deployment descriptor resource from {@see ArtifactEditModel}using a defined URI.
	 * </p>
	 * 
	 * @return The correct deployment descriptor resource for the underlying
	 *         {@see WorkbenchComponent}
	 * 
	 */
	public abstract Resource getDeploymentDescriptorResource();

	/**
	 * <p>
	 * Obtains the root object from a deployment descriptor resource, the root object contains all
	 * other resource defined objects. Examples of a deployment descriptor root include:
	 * {@see org.eclipse.jst.j2ee.webapplication.WebApp},
	 * {@see org.eclipse.jst.j2ee.application.Application}, and
	 * {@see org.eclipse.jst.j2ee.ejb.EJBJar}
	 * </p>
	 * <p>
	 * Subclasses may extend this method to perform their own deployment descriptor creataion/
	 * retrieval.
	 * </p>
	 * 
	 * @return An EMF metamodel object representing the J2EE deployment descriptor
	 * 
	 */

	public EObject getDeploymentDescriptorRoot() {
		Resource res = getDeploymentDescriptorResource();
		if (!res.getContents().isEmpty())
			return res.getContents().get(0);
		return null;
	}

	/**
	 * Returns a working copy managet
	 * 
	 * @return
	 */

	public WorkingCopyManager getWorkingCopyManager() {
		if(isBinary()){
			throwAttemptedBinaryEditModelAccess();
		}
		return ((JavaArtifactEditModel)getArtifactEditModel()).getWorkingCopyManager();
	}
	
	/**
	 * Returns the working copy remembered for the compilation unit.
	 * 
	 * @param input
	 *            ICompilationUnit
	 * @return the working copy of the compilation unit, or <code>null</code> if there is no
	 *         remembered working copy for this compilation unit
	 */
	public ICompilationUnit getWorkingCopy(ICompilationUnit cu, boolean forNewCU) throws org.eclipse.core.runtime.CoreException {
		if (isReadOnly())
			return null;
		return getWorkingCopyManager().getWorkingCopy(cu, forNewCU);
	}
	@Override
	protected boolean validProjectVersion(IProject project) {
		
		return EnterpriseArtifactEdit.SUPPORT_LEGACY_PROJECTS || primValidProjectVersion(project);
	}
protected boolean primValidProjectVersion(IProject project) {
		
		// Return true if project is being created
		if (!project.exists()) return true;
		IFacetedProject facetedProject = null;
		try {
			facetedProject = ProjectFacetsManager.create(project);
		} catch (CoreException e) {
			// Do Nothing
		}
		if (facetedProject == null)
			// Return true if project facet is being created
			return true;
		//return true for legacy projects, or use preference.
		return !J2EEProjectUtilities.isJEEProject(project);
	}

	/**
	 * Returns the working copy remembered for the compilation unit encoded in the given editor
	 * input. Does not connect the edit model to the working copy.
	 * 
	 * @param input
	 *            ICompilationUnit
	 * @return the working copy of the compilation unit, or <code>null</code> if the input does
	 *         not encode an editor input, or if there is no remembered working copy for this
	 *         compilation unit
	 */
	public ICompilationUnit getExistingWorkingCopy(ICompilationUnit cu) throws org.eclipse.core.runtime.CoreException {
		return getWorkingCopyManager().getExistingWorkingCopy(cu);
	}

	public URI getModuleLocation(String moduleName) {
		if (getProject()!=null)
			return ModuleURIUtil.fullyQualifyURI(getProject());
		return null;
	}

	/**
	 * This will delete
	 * 
	 * @cu from the workbench and fix the internal references for this working copy manager.
	 */
	public void delete(org.eclipse.jdt.core.ICompilationUnit cu, org.eclipse.core.runtime.IProgressMonitor monitor) {
		getWorkingCopyManager().delete(cu, monitor);
	}

	/**
	 * <p>
	 * Create an deployment descriptor resource if one does not get and return it. Subclasses should
	 * overwrite this method to create their own type of deployment descriptor
	 * </p>
	 * 
	 * @return an EObject
	 */

	public abstract EObject createModelRoot();

	/**
	 * <p>
	 * Create an deployment descriptor resource if one does not get and return it. Subclasses should
	 * overwrite this method to create their own type of deployment descriptor
	 * </p>
	 * 
	 * @param int
	 *            version of the component
	 * @return an EObject
	 */

	public abstract EObject createModelRoot(int version);
	
	public Archive asArchive(boolean includeSource) throws OpenFailureException{
		return asArchive(includeSource, true);
	}
	
	public Archive asArchive(boolean includeSource, boolean includeClasspathComponents) throws OpenFailureException {
		return null;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jst.j2ee.model.IModelProvider#getModelObject()
	 */
	public Object getModelObject() {
		if ( getWritableEdit() != null)
			return getWritableEdit().getContentModelRoot();
		return getContentModelRoot();
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jst.j2ee.model.IModelProvider#getModelObject(org.eclipse.core.runtime.IPath)
	 */
	public Object getModelObject(IPath modelPath) {
		if ( getWritableEdit() != null) {
			Resource res = ((ArtifactEditModel)getWritableEdit().getAdapter(ArtifactEditModel.ADAPTER_TYPE)).getResource(URI.createURI(modelPath.toString()));
			if (res != null && !res.getContents().isEmpty())
				return res.getContents().get(0);
			return null;
		}
		return getContentModelRoot();
	}

	public IModelProvider create(IProject project) {
		return (IModelProvider)getArtifactEditForRead(project);
	}

	public IModelProvider create(IVirtualComponent component) {
		return (IModelProvider)getArtifactEditForRead(component);
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jst.j2ee.model.IModelProvider#modify(java.lang.Runnable, org.eclipse.core.runtime.IPath)
	 */
	public void modify(Runnable runnable, IPath modelPath) {
		//About to modify and save this model
		
		// access model  (write count)
		// cache writable model (setWriteableEdit())
		// run runnable
		// save model
		// release access count
		// null Writable Edit
		
	}

	public IStatus validateEdit(IPath modelPath, Object context) {
		// ArtifactEdit will validate all files it manages, and uses its own context mechanism
		return validateEdit();
	}

	/**
	 * @param writableEdit the writableEdit to set
	 */
	protected void setWritableEdit(ArtifactEdit writableEdit) {
		this.writableEdit = writableEdit;
	}

	/**
	 * @return the writableEdit
	 */
	protected ArtifactEdit getWritableEdit() {
		return writableEdit;
	}
	
	public void addListener(IModelProviderListener listener)
	{
		if (listener instanceof EditModelListener)
		{
			addListener((EditModelListener)listener);
		}
	}

	public void removeListener(IModelProviderListener listener)
	{
		if (listener instanceof EditModelListener)
		{
			removeListener((EditModelListener)listener);
		}
	}
}