/***************************************************************************************************
 * Copyright (c) 2003, 2004 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.util;

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

import org.eclipse.core.resources.IProject;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.jst.j2ee.application.Application;
import org.eclipse.jst.j2ee.application.ApplicationFactory;
import org.eclipse.jst.j2ee.application.ApplicationResource;
import org.eclipse.jst.j2ee.commonarchivecore.internal.Archive;
import org.eclipse.jst.j2ee.commonarchivecore.internal.CommonarchiveFactory;
import org.eclipse.jst.j2ee.commonarchivecore.internal.exception.OpenFailureException;
import org.eclipse.jst.j2ee.componentcore.EnterpriseArtifactEdit;
import org.eclipse.jst.j2ee.internal.J2EEConstants;
import org.eclipse.jst.j2ee.internal.archive.operations.EARComponentLoadStrategyImpl;
import org.eclipse.jst.j2ee.internal.common.XMLResource;
import org.eclipse.jst.j2ee.internal.plugin.IJ2EEModuleConstants;
import org.eclipse.wst.common.componentcore.ArtifactEdit;
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.internal.StructureEdit;
import org.eclipse.wst.common.componentcore.internal.util.IArtifactEditFactory;
import org.eclipse.wst.common.componentcore.internal.util.IModuleConstants;
import org.eclipse.wst.common.componentcore.resources.ComponentHandle;
import org.eclipse.wst.common.componentcore.resources.IVirtualComponent;
import org.eclipse.wst.common.componentcore.resources.IVirtualReference;

/**
 * <p>
 * EARArtifactEdit obtains an {@see org.eclipse.jst.j2ee.application.Application}&nbsp;metamodel.
 * The {@see org.eclipse.jst.j2ee.application.ApplicationResource}&nbsp; which stores the metamodel
 * is retrieved from the {@see org.eclipse.wst.common.modulecore.ArtifactEditModel}&nbsp;using a
 * cached constant (@see
 * org.eclipse.jst.j2ee.commonarchivecore.internal.helpers.ArchiveConstants#APPLICATION_DD_URI). The
 * defined methods extract data or manipulate the contents of the underlying resource.
 * </p>
 */

public class EARArtifactEdit extends EnterpriseArtifactEdit implements IArtifactEditFactory{

	public static final Class ADAPTER_TYPE = EARArtifactEdit.class;
	/**
	 * <p>
	 * Identifier used to group and query common artifact edits.
	 * </p>
	 */
	public static String TYPE_ID = "jst.ear"; //$NON-NLS-1$


	/**
	 * 
	 */
	public EARArtifactEdit() {
		super();
		// TODO Auto-generated constructor stub
	}

	/**
	 * @param aHandle
	 * @param toAccessAsReadOnly
	 * @throws IllegalArgumentException
	 */
	public EARArtifactEdit(ComponentHandle aHandle, boolean toAccessAsReadOnly) throws IllegalArgumentException {
		super(aHandle, toAccessAsReadOnly);
		// TODO Auto-generated constructor stub
	}

	/**
	 * <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 EARArtifactEdit getEARArtifactEditForRead(ComponentHandle aHandle) {
		EARArtifactEdit artifactEdit = null;
		try {
			artifactEdit = new EARArtifactEdit(aHandle, 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 EARArtifactEdit getEARArtifactEditForWrite(ComponentHandle aHandle) {
		EARArtifactEdit artifactEdit = null;
		try {
			artifactEdit = new EARArtifactEdit(aHandle, 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 EARArtifactEdit that are returned through this
	 * method must be {@see #dispose()}ed of when no longer in use.
	 * </p>
	 * <p>
	 * Use to acquire an EARArtifactEdit 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 EARArtifactEdit that may only be used to read the underlying content
	 *         model
	 * @throws UnresolveableURIException
	 *             could not resolve uri.
	 */
	public static EARArtifactEdit getEARArtifactEditForRead(IVirtualComponent aModule) {
		try {
			if (isValidEARModule(aModule)) {
				IProject project = aModule.getProject();
				ModuleCoreNature nature = ModuleCoreNature.getModuleCoreNature(project);
				return new EARArtifactEdit(nature, aModule, true);
			}
		} catch (UnresolveableURIException uue) {
			//Ignore
		}
		return null;
	}


	/**
	 * <p>
	 * Returns an instance facade to manage the underlying edit model for the given
	 * {@see WorkbenchComponent}. Instances of WebArtifactEdit that are returned through this
	 * method must be {@see #dispose()}ed of when no longer in use.
	 * </p>
	 * <p>
	 * Use to acquire an EARArtifactEdit 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 EARArtifactEdit that may be used to modify and persist changes to the
	 *         underlying content model
	 */
	public static EARArtifactEdit getEARArtifactEditForWrite(IVirtualComponent aModule) {
		try {
			if (isValidEARModule(aModule)) {
				IProject project = aModule.getProject();
				ModuleCoreNature nature = ModuleCoreNature.getModuleCoreNature(project);
				return new EARArtifactEdit(nature, aModule, false);
			}
		} catch (UnresolveableURIException uue) {
			//Ignore
		}
		return null;
	}

	/**
	 * @param module
	 *            A {@see WorkbenchComponent}
	 * @return True if the supplied module
	 *         {@see ArtifactEdit#isValidEditableModule(WorkbenchComponent)}and the moduleTypeId is
	 *         a JST module
	 */
	public static boolean isValidEARModule(IVirtualComponent aModule) throws UnresolveableURIException {
		if (!isValidEditableModule(aModule))
			return false;
		/* and match the JST_WEB_MODULE type */
		if (!TYPE_ID.equals(aModule.getComponentTypeId()))
			return false;
		return true;
	}

	/**
	 * <p>
	 * Creates an instance facade for the given {@see ArtifactEditModel}.
	 * </p>
	 * 
	 * @param anArtifactEditModel
	 */
	public EARArtifactEdit(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 EARArtifactEdit(ModuleCoreNature aNature, IVirtualComponent aModule, boolean toAccessAsReadOnly) {
		super(aNature, aModule, toAccessAsReadOnly);
	}

	/**
	 * <p>
	 * Retrieves J2EE version information from ApplicationResource.
	 * </p>
	 * 
	 * @return an integer representation of a J2EE Spec version
	 * 
	 */
	public int getJ2EEVersion() {
		return getApplicationXmiResource().getJ2EEVersionID();
	}

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

	public ApplicationResource getApplicationXmiResource() {
		return (ApplicationResource) getDeploymentDescriptorResource();
	}

	/**
	 * <p>
	 * Obtains the Application {@see Application}root object from the {@see ApplicationResource},
	 * the root object contains all other resource defined objects.
	 * </p>
	 * 
	 * @return Application
	 * 
	 */

	public Application getApplication() {
		return (Application) getDeploymentDescriptorRoot();
	}

	/**
	 * <p>
	 * Retrieves the resource from the {@see ArtifactEditModel}
	 * </p>
	 * 
	 * @return Resource
	 * 
	 */

	public Resource getDeploymentDescriptorResource() {
		return getArtifactEditModel().getResource(J2EEConstants.APPLICATION_DD_URI_OBJ);
	}


	/**
	 * <p>
	 * Creates a deployment descriptor root object (Application) 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}
	 * @param version
	 *            Version to be set on resource....if null default is taken
	 * 
	 * Note: This method is typically used for JUNIT - move?
	 * </p>
	 */
	protected void addApplicationIfNecessary(XMLResource aResource) {
		if (aResource != null) {
			if (aResource.getContents() == null || aResource.getContents().isEmpty()) {
				Application newApp = ApplicationFactory.eINSTANCE.createApplication();
				aResource.getContents().add(newApp);
			}
			Application application = (Application) aResource.getContents().get(0);
			URI moduleURI = getArtifactEditModel().getModuleURI();
			try {
				application.setDisplayName(StructureEdit.getDeployedName(moduleURI));
			} catch (UnresolveableURIException e) {
				//Ignore
			}
			aResource.setID(application, J2EEConstants.APPL_ID);
			// TODO add more mandatory elements
		}
	}

	/**
	 * Checks if the uri mapping already exists.
	 * 
	 * @param String
	 *            currentURI - The current uri of the module.
	 * @return boolean
	 */
	public boolean uriExists(String currentURI) {
		if (currentURI != null) {
			IVirtualComponent comp = ComponentCore.createComponent(getComponentHandle().getProject(), getComponentHandle().getName());
			IVirtualReference[] refComponents = comp.getReferences();
			if (refComponents.length == 0)
				return false;
			for (int i = 0; i < refComponents.length; i++) {
				if (refComponents[i].getRuntimePath().equals(currentURI))
					return true;
			}
		} // if
		return false;
	} // uriExists


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

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jst.j2ee.internal.modulecore.util.EnterpriseArtifactEdit#createModelRoot(java.lang.Integer)
	 */
	public EObject createModelRoot(int version) {
		ApplicationResource res = (ApplicationResource) getDeploymentDescriptorResource();
		res.setModuleVersionID(version);
		addApplicationIfNecessary(res);
		return ((ApplicationResource) getDeploymentDescriptorResource()).getRootObject();
	}

	/**
	 * This method will return the list of IVirtualReferences for all of the utility modules
	 * contained in the EAR application
	 * 
	 * @return - a list of IVirtualReferences for utility modules in the EAR
	 */
	public List getUtilityModuleReferences() {
		List utilityModuleTypes = new ArrayList();
		utilityModuleTypes.add(IModuleConstants.JST_UTILITY_MODULE);
		return getComponentReferences(utilityModuleTypes);
	}
	
	public String getModuleURI(IVirtualComponent moduleComp) {
		IVirtualComponent comp = getModule(moduleComp.getName());
		if(comp != null) {
			if(comp.getComponentTypeId().equals(IModuleConstants.JST_EJB_MODULE) || 
						comp.getComponentTypeId().equals(IModuleConstants.JST_APPCLIENT_MODULE) ||
						comp.getComponentTypeId().equals(IModuleConstants.JST_UTILITY_MODULE))
				return comp.getName().concat(IJ2EEModuleConstants.JAR_EXT);
			else if (comp.getComponentTypeId().equals((IModuleConstants.JST_WEB_MODULE)))
				return comp.getName().concat(IJ2EEModuleConstants.WAR_EXT);
			else if (comp.getComponentTypeId().equals((IModuleConstants.JST_CONNECTOR_MODULE)))
				return comp.getName().concat(IJ2EEModuleConstants.RAR_EXT);
			
				
		}
		return null;
	}
    /**
     * This method will return the an IVirtualComponent for the given module name.  The method take either moduleName or 
     * moduleName + ".module_extension" (module_extension = ".jar" || ".war" || ".rar") which allows users to get a IVirtualComponent 
     * for a given entry in an application.xml
     * 
     * @return - a IVirtualComponent for module name
     */
	public IVirtualComponent getModule (String moduleName) {
        if(moduleName == null)
            return null;
        if(moduleName.endsWith(IJ2EEModuleConstants.JAR_EXT) || moduleName.endsWith(IJ2EEModuleConstants.WAR_EXT) || moduleName.endsWith(IJ2EEModuleConstants.RAR_EXT))
            moduleName = moduleName.substring(0, (moduleName.length()- IJ2EEModuleConstants.JAR_EXT.length()));
        List references = getJ2EEModuleReferences();
		references.addAll(getUtilityModuleReferences());
		for(int i = 0; i < references.size(); i++) {
			IVirtualReference ref = (IVirtualReference)references.get(i);
			IVirtualComponent component = ref.getReferencedComponent();
			if(component.getName().equals(moduleName)) {
				return component;
			}
		}
		return null;
	}

	/**
	 * This method will return the list of IVirtualReferences for the J2EE module components
	 * contained in this EAR application.
	 * 
	 * @return - a list of IVirtualReferences for J2EE modules in the EAR
	 */
	public List getJ2EEModuleReferences() {
		List j2eeTypes = new ArrayList();
		j2eeTypes.add(IModuleConstants.JST_APPCLIENT_MODULE);
		j2eeTypes.add(IModuleConstants.JST_CONNECTOR_MODULE);
		j2eeTypes.add(IModuleConstants.JST_EJB_MODULE);
		j2eeTypes.add(IModuleConstants.JST_WEB_MODULE);
		return getComponentReferences(j2eeTypes);
	}
	
	/**
	 * This method will return the list of IVirtualReferences for all of the components
	 * contained in this EAR application.
	 * 
	 * @return - a list of IVirtualReferences for components in the EAR
	 */
	public List getComponentReferences() {
		return getComponentReferences(Collections.EMPTY_LIST);
	}
	
	private List getComponentReferences(List componentTypes) {
		List components = new ArrayList();
		IVirtualComponent earComponent = getComponent();
		if (earComponent.getComponentTypeId().equals(IModuleConstants.JST_EAR_MODULE)) {
			IVirtualReference[] refComponents = earComponent.getReferences();
			for (int i = 0; i < refComponents.length; i++) {
				IVirtualComponent module = refComponents[i].getReferencedComponent();
				//if component types passed in is null then return all components
				if (componentTypes == null || componentTypes.size()==0)
					components.add(refComponents[i]);
				else {
					 if (componentTypes.contains(module.getComponentTypeId())) {
							components.add(refComponents[i]);
						}
					}
				}
			}
		return components;
	}

	public ArtifactEdit createArtifactEditForRead(IVirtualComponent aComponent) {
		
		return getEARArtifactEditForRead(aComponent);
	}

	public ArtifactEdit createArtifactEditForWrite(IVirtualComponent aComponent) {
		
		return getEARArtifactEditForWrite(aComponent);
	}
	
	public Archive asArchive(boolean includeSource) throws OpenFailureException {
		EARComponentLoadStrategyImpl loader = new EARComponentLoadStrategyImpl(getComponent());
		loader.setExportSource(includeSource);
		String uri = getComponent().getComponentHandle().toString();
		return CommonarchiveFactory.eINSTANCE.openEARFile(loader, uri);
	}
	
}