/*******************************************************************************
 * Copyright (c) 2005, 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.internal.webservice.componentcore.util;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IResourceProxy;
import org.eclipse.core.resources.IResourceProxyVisitor;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.jem.util.emf.workbench.WorkbenchResourceHelperBase;
import org.eclipse.jst.j2ee.componentcore.EnterpriseArtifactEdit;
import org.eclipse.jst.j2ee.internal.J2EEConstants;
import org.eclipse.jst.j2ee.internal.webservice.plugin.WebServicePlugin;
import org.eclipse.jst.j2ee.internal.webservices.WSDLServiceExtManager;
import org.eclipse.jst.j2ee.internal.webservices.WSDLServiceHelper;
import org.eclipse.jst.j2ee.model.IModelProvider;
import org.eclipse.jst.j2ee.project.JavaEEProjectUtilities;
import org.eclipse.jst.j2ee.webservice.wsdd.WebServices;
import org.eclipse.jst.j2ee.webservice.wsdd.WsddFactory;
import org.eclipse.jst.j2ee.webservice.wsdd.WsddResource;
import org.eclipse.wst.common.componentcore.ComponentCore;
import org.eclipse.wst.common.componentcore.ModuleCoreNature;
import org.eclipse.wst.common.componentcore.UnresolveableURIException;
import org.eclipse.wst.common.componentcore.internal.ArtifactEditModel;
import org.eclipse.wst.common.componentcore.resources.IVirtualComponent;
import org.eclipse.wst.common.componentcore.resources.IVirtualResource;

/**
 * <p>
 * WSDDArtifactEdit obtains a WS Deployment Descriptor metamodel specifec data
 * from a {@see org.eclipse.jst.j2ee.ejb.EJBResource}&nbsp; which stores the
 * metamodel. The {@see org.eclipse.jst.j2ee.ejb.EJBResource}&nbsp;is retrieved
 * from the {@see org.eclipse.wst.common.modulecore.ArtifactEditModel}&nbsp;using
 * a constant {@see J2EEConstants#EJBJAR_DD_URI_OBJ}. The defined methods
 * extract data or manipulate the contents of the underlying resource.
 * </p>
 */
public class WSDDArtifactEdit extends EnterpriseArtifactEdit {

	/**
	 * <p>
	 * Identifier used to link WSDDArtifactEdit to a WsddAdapterFactory {@see
	 * WsddAdapterFactory} stored in an AdapterManger (@see AdapterManager)
	 * </p>
	 */

	public static final Class ADAPTER_TYPE = WSDDArtifactEdit.class;

	public static final String WSIL_FILE_EXT = "wsil"; //$NON-NLS-1$

	public static final String WSDL_FILE_EXT = "wsdl"; //$NON-NLS-1$

	/**
	 * @param aHandle
	 * @param toAccessAsReadOnly
	 * @throws IllegalArgumentException
	 */
	public WSDDArtifactEdit(IProject aProject, boolean toAccessAsReadOnly) throws IllegalArgumentException {
		super(aProject, toAccessAsReadOnly);
	}
	
	/**
	 * <p>
	 * Creates an instance facade for the given {@see ArtifactEditModel}.
	 * </p>
	 * 
	 * @param anArtifactEditModel
	 */
	public WSDDArtifactEdit(ArtifactEditModel model) {
		super(model);
	}

	/**
	 * <p>
	 * Creates an instance facade for the given {@see ArtifactEditModel}
	 * </p>
	 * <p>
	 * Note: This method is for internal use only. Clients should not call this
	 * method.
	 * </p>
	 * 
	 * @param aNature
	 *            A non-null {@see ModuleCoreNature}for an accessible project
	 * @param aModule
	 *            A non-null {@see WorkbenchComponent}pointing to a module from
	 *            the given {@see ModuleCoreNature}
	 */
	public WSDDArtifactEdit(ModuleCoreNature aNature, IVirtualComponent aModule, boolean toAccessAsReadOnly) {
		super(aNature, aModule, toAccessAsReadOnly);
	}

	/**
	 * @return WsddResource from (@link getDeploymentDescriptorResource())
	 */

	public WsddResource getWsddXmiResource() {
		return (WsddResource) getDeploymentDescriptorResource();
	}

	/**
	 * <p>
	 * Retrieves J2EE version information from EJBResource.
	 * </p>
	 * 
	 * @return an integer representation of a J2EE Spec version
	 */

	@Override
	public int getJ2EEVersion() {
		return getWsddXmiResource().getJ2EEVersionID();
	}

	/**
	 * <p>
	 * Retrieves the underlying resource from the ArtifactEditModel using
	 * defined URI.
	 * </p>
	 * 
	 * @return Resource
	 */

	@Override
	public Resource getDeploymentDescriptorResource() {
		return getArtifactEditModel().getResource(getWebServicesXmlResourceURI());
	}
	
	public static void createDeploymentDescriptor(IProject project, int version) {
		EnterpriseArtifactEdit wsDDEdit = new WSDDArtifactEdit(project, false);
		try {
			wsDDEdit.createModelRoot(version);
			wsDDEdit.save(null);
		} finally {  // Make sure new resource is removed  - the uri used for creation shouldn't be cached
			Resource newRes = wsDDEdit.getDeploymentDescriptorResource();
			WorkbenchResourceHelperBase.getResourceSet(project).getResources().remove(newRes);
			newRes.unload();
			wsDDEdit.dispose();
		}
	}

	public URI getWebServicesXmlResourceURI() {

		URI resourceURI = J2EEConstants.WEB_SERVICES_WEB_INF_DD_URI_OBJ;
		if (isValidAppClientModule(getComponent()))
			resourceURI = J2EEConstants.WEB_SERVICES_META_INF_DD_URI_OBJ;
		else if (isValidEJBModule(getComponent()))
			resourceURI = J2EEConstants.WEB_SERVICES_META_INF_DD_URI_OBJ;
		return resourceURI;
	}

	/**
	 * @return WebServices from (@link getDeploymentDescriptorRoot())
	 */
	public WebServices getWebServices() {
		if (!getProject().isAccessible())
			return null;
		if (getWsddXmiResource().getContents().isEmpty())
			return null;
		return (WebServices) getDeploymentDescriptorRoot();
	}

	/**
	 * <p>
	 * Obtains the WebServices (@see WebServices) root object from the
	 * WsddResource. If the root object does not exist, then one is created
	 * (@link addEJBJarIfNecessary(getEJBJarXmiResource())). The root object
	 * contains all other resource defined objects.
	 * </p>
	 * 
	 * @return EObject
	 */
	@Override
	public EObject getDeploymentDescriptorRoot() {
		List contents = getDeploymentDescriptorResource().getContents();
		if (contents.size() > 0)
			return (EObject) contents.get(0);
		addWebServicesIfNecessary(getWsddXmiResource());
		if (contents.isEmpty())
			return null;
		return (EObject) contents.get(0);
	}

	/**
	 * <p>
	 * Creates a deployment descriptor root object (WebServices) and populates
	 * with data. Adds the root object to the deployment descriptor resource.
	 * </p>
	 * <p>
	 * 
	 * @param aModule
	 *            A non-null pointing to a {@see XMLResource} Note: This method
	 *            is typically used for JUNIT - move?
	 *            </p>
	 */
	protected void addWebServicesIfNecessary(WsddResource aResource) {
		if (aResource != null) {
			if (aResource.getContents() == null || aResource.getContents().isEmpty()) {
				WebServices ws = WsddFactory.eINSTANCE.createWebServices();
				aResource.getContents().add(ws);
			}
			aResource.getContents().get(0);
			getArtifactEditModel().getModuleURI();
			try {
				aResource.saveIfNecessary();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}

	/**
	 * <p>
	 * Returns an instance facade to manage the underlying edit model for the
	 * given {@see WorkbenchComponent}. Instances of ArtifactEdit that are
	 * returned through this method must be {@see #dispose()}ed of when no
	 * longer in use.
	 * </p>
	 * <p>
	 * Use to acquire an ArtifactEdit facade for a specific
	 * {@see WorkbenchComponent}&nbsp;that will not be used for editing.
	 * Invocations of any save*() API on an instance returned from this method
	 * will throw exceptions.
	 * </p>
	 * <p>
	 * <b>The following method may return null. </b>
	 * </p>
	 * 
	 * @param aModule
	 *            A valid {@see WorkbenchComponent}&nbsp;with a handle that
	 *            resolves to an accessible project in the workspace
	 * @return An instance of ArtifactEdit that may only be used to read the
	 *         underlying content model
	 */
	public static WSDDArtifactEdit getWSDDArtifactEditForRead(IProject aProject) {
		WSDDArtifactEdit artifactEdit = null;
		IVirtualComponent comp = ComponentCore.createComponent(aProject);
		if (comp != null && isValidWSDDModule(comp)) {
			try {
				artifactEdit = new WSDDArtifactEdit(aProject, true);
			} catch (IllegalArgumentException iae) {
				artifactEdit = null;
			}
		}
		return artifactEdit;
	}

	/**
	 * <p>
	 * Returns an instance facade to manage the underlying edit model for the
	 * given {@see WorkbenchComponent}. Instances of ArtifactEdit that are
	 * returned through this method must be {@see #dispose()}ed of when no
	 * longer in use.
	 * </p>
	 * <p>
	 * Use to acquire an ArtifactEdit facade for a specific
	 * {@see WorkbenchComponent}&nbsp;that will be used for editing.
	 * </p>
	 * <p>
	 * <b>The following method may return null. </b>
	 * </p>
	 * 
	 * @param aModule
	 *            A valid {@see WorkbenchComponent}&nbsp;with a handle that
	 *            resolves to an accessible project in the workspace
	 * @return An instance of ArtifactEdit that may be used to modify and
	 *         persist changes to the underlying content model
	 */
	public static WSDDArtifactEdit getWSDDArtifactEditForWrite(IProject aProject) {
		WSDDArtifactEdit artifactEdit = null;
		IVirtualComponent comp = ComponentCore.createComponent(aProject);
		if (comp != null && isValidWSDDModule(comp)) {
			try {
				artifactEdit = new WSDDArtifactEdit(aProject, false);
			} catch (IllegalArgumentException iae) {
				artifactEdit = null;
			}
		}
		return artifactEdit;
	}

	/**
	 * <p>
	 * Returns an instance facade to manage the underlying edit model for the
	 * given {@see WorkbenchComponent}. Instances of WSDDArtifactEdit that are
	 * returned through this method must be {@see #dispose()}ed of when no
	 * longer in use.
	 * </p>
	 * <p>
	 * Use to acquire an WSDDArtifactEdit facade for a specific
	 * {@see WorkbenchComponent}&nbsp;that will not be used for editing.
	 * Invocations of any save*() API on an instance returned from this method
	 * will throw exceptions.
	 * </p>
	 * <p>
	 * <b>This method may return null. </b>
	 * </p>
	 * <p>
	 * Note: This method is for internal use only. Clients should not call this
	 * method.
	 * </p>
	 * 
	 * @param aModule
	 *            A valid {@see WorkbenchComponent}&nbsp;with a handle that
	 *            resolves to an accessible project in the workspace
	 * @return An instance of WSDDArtifactEdit that may only be used to read the
	 *         underlying content model
	 * @throws UnresolveableURIException
	 *             could not resolve uri.
	 */
	public static WSDDArtifactEdit getWSDDArtifactEditForRead(IVirtualComponent aModule) {
		IProject project = aModule.getProject();
		ModuleCoreNature nature = ModuleCoreNature.getModuleCoreNature(project);
		if (isValidWSDDModule(aModule))
			return new WSDDArtifactEdit(nature, aModule, true);
		return null;
	}

	/**
	 * <p>
	 * Returns an instance facade to manage the underlying edit model for the
	 * given {@see WorkbenchComponent}. Instances of EJBArtifactEdit that are
	 * returned through this method must be {@see #dispose()}ed of when no
	 * longer in use.
	 * </p>
	 * <p>
	 * Use to acquire an WSDDArtifactEdit facade for a specific
	 * {@see WorkbenchComponent}&nbsp;that will be used for editing.
	 * </p>
	 * <p>
	 * <b>This method may return null. </b>
	 * </p>
	 * <p>
	 * Note: This method is for internal use only. Clients should not call this
	 * method.
	 * </p>
	 * 
	 * @param aModule
	 *            A valid {@see WorkbenchComponent}&nbsp;with a handle that
	 *            resolves to an accessible project in the workspace
	 * @return An instance of WSDDArtifactEdit that may be used to modify and
	 *         persist changes to the underlying content model
	 */
	public static WSDDArtifactEdit getWSDDArtifactEditForWrite(IVirtualComponent aModule) {
		IProject project = aModule.getProject();
		ModuleCoreNature nature = ModuleCoreNature.getModuleCoreNature(project);
		if (isValidWSDDModule(aModule))
			return new WSDDArtifactEdit(nature, aModule, false);
		return null;
	}

	/**
	 * @param component
	 *            A {@see IVirtualComponent}
	 * @return True if the supplied module
	 *         {@see ArtifactEdit#isValidEditableModule(IVirtualComponent)}and
	 *         the moduleTypeId is a JST module
	 */
	public static boolean isValidEJBModule(IVirtualComponent aComponent) {
		return JavaEEProjectUtilities.isEJBProject(aComponent.getProject());
	}

	/**
	 * @param component
	 *            A {@see IVirtualComponent}
	 * @return True if the supplied module
	 *         {@see ArtifactEdit#isValidWSDDModule(IVirtualComponent)}and the
	 *         moduleTypeId is a JST module
	 */
	protected static boolean isValidWSDDModule(IVirtualComponent aComponent) {
		return (isValidAppClientModule(aComponent) || isValidWebModule(aComponent) || isValidEJBModule(aComponent));
	}

	/**
	 * @param component
	 *            A {@see IVirtualComponent}
	 * @return True if the supplied module
	 *         {@see ArtifactEdit#isValidEditableModule(IVirtualComponent)}and
	 *         the moduleTypeId is a JST module
	 */
	public static boolean isValidWebModule(IVirtualComponent aComponent) {
		return JavaEEProjectUtilities.isDynamicWebProject(aComponent.getProject());
	}

	/**
	 * @param component
	 *            A {@see IVirtualComponent}
	 * @return True if the supplied module
	 *         {@see ArtifactEdit#isValidEditableModule(IVirtualComponent)}and
	 *         the moduleTypeId is a JST module
	 */
	public static boolean isValidAppClientModule(IVirtualComponent aComponent) {
		return JavaEEProjectUtilities.isApplicationClientProject(aComponent.getProject());
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jst.j2ee.internal.modulecore.util.EnterpriseArtifactEdit#createModelRoot()
	 */
	@Override
	public EObject createModelRoot() {
		return createModelRoot(getJ2EEVersion());
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jst.j2ee.internal.modulecore.util.EnterpriseArtifactEdit#createModelRoot(int)
	 */
	@Override
	public EObject createModelRoot(int version) {
		WsddResource res = (WsddResource) getDeploymentDescriptorResource();
		res.setModuleVersionID(version);
		addWebServicesIfNecessary(res);
		return getWebServices();
	}

	@Override
	public EObject getContentModelRoot() {
		return getWebServices();
	}

	public List getWSILResources() {
		final List result = new ArrayList(); 
		
		try {
			getProject().accept(new IResourceProxyVisitor() {
				
				public boolean visit(IResourceProxy proxy) throws CoreException {
					if(proxy.getName().endsWith(WSIL_FILE_EXT)) {
						IResource file = proxy.requestResource();
						IVirtualResource[] vResources = ComponentCore.createResources(file);
						if (vResources.length > 0 && !result.contains(file))
							result.add(file);
					}
					return true;
				}
				
			}, IResource.NONE);
		} catch (CoreException e) {
			WebServicePlugin.logError(0, e.getMessage(), e);
		} 
		return result;
	}

	public List getWSDLResources() {
		return getResources(WSDL_FILE_EXT);
	}

	private List getResources(String ext) {
		List resources = getArtifactEditModel().getResources();
		List result = new ArrayList();
		for (int i = 0; i < resources.size(); i++) {
			Resource res = (Resource) resources.get(i);
			if (res != null && res.getURI().fileExtension() != null && res.getURI().fileExtension().equals(ext))
				result.add(res);
		}
		return result;
	}

	/**
	 * return the WSDLResource if it exists, otherwise return null
	 */
	public Resource getWsdlResource(String path) {
		if (path == null || path.equals(""))return null; //$NON-NLS-1$
		Resource res = null;
		try {
			res = getArtifactEditModel().getResource(URI.createURI(path));
		} catch (Exception e) {
			// Ignore
		}
		WSDLServiceHelper serviceHelper = WSDLServiceExtManager.getServiceHelper();
		if (res != null && res.isLoaded() && serviceHelper != null && serviceHelper.isWSDLResource(res))
			return res;
		return null;
	}
	@Override
	public IModelProvider create(IProject project) {
		return getWSDDArtifactEditForRead(project);
	}

	@Override
	public IModelProvider create(IVirtualComponent component) {
		return getWSDDArtifactEditForRead(component);
	}

	// [182417] This ArtifactEdit works for all project versions, so just return true.
	@Override
	protected boolean validProjectVersion(IProject project) {
		return true;
	}
	@Override
	public void modify(Runnable runnable, IPath modelPath) {
		setWritableEdit(getWSDDArtifactEditForWrite(getProject()));
		try{
			runnable.run();
			if( getWritableEdit() != null ){
				// Always save regardless of resource path passed - Artifactedits save resources as a unit
				getWritableEdit().saveIfNecessary( new NullProgressMonitor() );
			}
			
		} finally { //Properly dispose the write artifact edit
			getWritableEdit().dispose();
			setWritableEdit(null);
		}
	}
}