/*******************************************************************************
 * Copyright (c) 2003, 2006 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.actions;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.content.IContentType;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.IType;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.internal.ui.javaeditor.EditorUtility;
import org.eclipse.jem.java.JavaClass;
import org.eclipse.jem.util.emf.workbench.ProjectUtilities;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jst.j2ee.commonarchivecore.internal.ModuleFile;
import org.eclipse.jst.j2ee.commonarchivecore.internal.helpers.ArchiveOptions;
import org.eclipse.jst.j2ee.commonarchivecore.internal.util.ArchiveUtil;
import org.eclipse.jst.j2ee.ejb.EJBJar;
import org.eclipse.jst.j2ee.ejb.EnterpriseBean;
import org.eclipse.jst.j2ee.ejb.componentcore.util.EJBArtifactEdit;
import org.eclipse.jst.j2ee.internal.archive.JavaEEArchiveUtilities;
import org.eclipse.jst.j2ee.internal.componentcore.ComponentArchiveOptions;
import org.eclipse.jst.j2ee.internal.componentcore.JavaEEBinaryComponentHelper;
import org.eclipse.jst.j2ee.internal.ejb.provider.J2EEJavaClassProviderHelper;
import org.eclipse.jst.j2ee.internal.plugin.BinaryEditorUtilities;
import org.eclipse.jst.j2ee.internal.plugin.J2EEEditorUtility;
import org.eclipse.jst.j2ee.internal.plugin.J2EEUIMessages;
import org.eclipse.jst.j2ee.internal.plugin.J2EEUIPlugin;
import org.eclipse.jst.j2ee.web.componentcore.util.WebArtifactEdit;
import org.eclipse.jst.j2ee.webapplication.Servlet;
import org.eclipse.jst.j2ee.webapplication.WebApp;
import org.eclipse.jst.j2ee.webservice.wsdd.BeanLink;
import org.eclipse.jst.j2ee.webservice.wsdd.EJBLink;
import org.eclipse.jst.j2ee.webservice.wsdd.ServletLink;
import org.eclipse.jst.jee.archive.IArchive;
import org.eclipse.jst.jee.archive.IArchiveResource;
import org.eclipse.jst.jee.util.internal.JavaEEQuickPeek;
import org.eclipse.ui.IEditorDescriptor;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IEditorRegistry;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.ide.IDE;
import org.eclipse.ui.part.FileEditorInput;
import org.eclipse.ui.part.ISetSelectionTarget;
import org.eclipse.wst.common.componentcore.internal.resources.VirtualArchiveComponent;
import org.eclipse.wst.common.componentcore.internal.util.ComponentUtilities;
import org.eclipse.wst.common.componentcore.resources.IVirtualComponent;
import org.eclipse.wst.common.internal.emfworkbench.WorkbenchResourceHelper;

/**
 * Action for opening a J2EE resource from the J2EE navigator.
 */
public class OpenJ2EEResourceAction extends AbstractOpenAction {
	
	public static final String ID = "org.eclipse.jst.j2ee.internal.internal.ui.actions.OpenJ2EEResourceAction"; //$NON-NLS-1$
	public static final String JAVA_EDITOR_ID = "org.eclipse.jst.j2ee.internal.internal.ejb.ui.java.EnterpriseBeanJavaEditor"; //$NON-NLS-1$
	public static final String BASE_JAVA_EDITOR_ID = "org.eclipse.jdt.ui.CompilationUnitEditor"; //$NON-NLS-1$
	
	protected static IEditorDescriptor javaEditorDescriptor;
	protected static IEditorDescriptor baseJavaEditorDescriptor;

	/**
	 * Create an instance of this class
	 */
	public OpenJ2EEResourceAction() {
		super("Open"); //$NON-NLS-1$
	}

	/**
	 * Returns the action ID.
	 */
	public String getID() {
		return ID;
	}

	public static IEditorDescriptor getJavaEditorDescriptor() {
		if (javaEditorDescriptor == null)
			javaEditorDescriptor = findEditorDescriptor(JAVA_EDITOR_ID);
		return javaEditorDescriptor;
	}

	public static IEditorDescriptor getBaseJavaEditorDescriptor() {
		if (baseJavaEditorDescriptor == null)
			baseJavaEditorDescriptor = findEditorDescriptor(BASE_JAVA_EDITOR_ID);
		return baseJavaEditorDescriptor;
	}
	
	protected void openAppropriateEditor(IVirtualComponent c){
		if (c == null){
			return;
		}
		IWorkbenchPage page = null;
		IEditorPart editor = null;
		try {
			page = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
			
			IEditorInput editorInput = null;
			
			//[Bug 237794] if component c is a JEE 5 archive then editorInput needs to be a BinaryEditorInput
			if (c instanceof VirtualArchiveComponent) {
				JavaEEQuickPeek qp = JavaEEBinaryComponentHelper.getJavaEEQuickPeek(c);
				//[Bug 239440] because Connectors are opened with the basic XML editor and not a specialized editor they need binary editor input
				if( qp.getJavaEEVersion() == JavaEEQuickPeek.JEE_5_0_ID || qp.getType() == JavaEEQuickPeek.CONNECTOR_TYPE) {
					String path = ((EObject)srcObject).eResource().getURI().toString();
					editorInput = BinaryEditorUtilities.getBinaryEditorInput((VirtualArchiveComponent)c, path);
				}
			} 
			
			//this is for all other cases
			if(editorInput == null) {
				editorInput = new ComponentEditorInput(c);
			}
			
			editor = page.openEditor(editorInput, currentDescriptor.getId());
			if (editor instanceof ISetSelectionTarget)
				((ISetSelectionTarget) editor).selectReveal(getStructuredSelection());
		} catch (Exception e) {
			MessageDialog.openError(page.getWorkbenchWindow().getShell(), J2EEUIMessages.getResourceString("Problems_Opening_Editor_ERROR_"), e.getMessage()); //$NON-NLS-1$ = "Problems Opening Editor"
		}
	}
	
	
	/**
	 * open the appropriate editor
	 */
	protected void openAppropriateEditor(IResource r) {
		if (r == null)
			return;
		IWorkbenchPage page = null;
		IEditorPart editor = null;
		try {
			page = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
			editor = page.openEditor(new FileEditorInput((IFile) r), currentDescriptor.getId());
			if (editor instanceof ISetSelectionTarget)
				((ISetSelectionTarget) editor).selectReveal(getStructuredSelection());
		} catch (Exception e) {
			MessageDialog.openError(page.getWorkbenchWindow().getShell(), J2EEUIMessages.getResourceString("Problems_Opening_Editor_ERROR_"), e.getMessage()); //$NON-NLS-1$ = "Problems Opening Editor"
		}
	}
	
	/**
	 * The user has invoked this action
	 */
	public void run() {
		if (!isEnabled())
			return;
		
		if (srcObject instanceof J2EEJavaClassProviderHelper) {
			((J2EEJavaClassProviderHelper) srcObject).openInEditor();
			return;
		}
		
		if( isEJB3BeanObject(srcObject) ){
			String name = ""; //$NON-NLS-1$
			if( srcObject instanceof org.eclipse.jst.javaee.ejb.SessionBean ){
				org.eclipse.jst.javaee.ejb.SessionBean bean = (org.eclipse.jst.javaee.ejb.SessionBean)srcObject;
				name = bean.getEjbClass();
			}else if(srcObject instanceof org.eclipse.jst.javaee.ejb.MessageDrivenBean){
				org.eclipse.jst.javaee.ejb.MessageDrivenBean  bean = (org.eclipse.jst.javaee.ejb.MessageDrivenBean)srcObject;
				name = bean.getEjbClass();
			}else if(srcObject instanceof org.eclipse.jst.javaee.ejb.EntityBean){
				org.eclipse.jst.javaee.ejb.EntityBean bean = (org.eclipse.jst.javaee.ejb.EntityBean)srcObject;
				name = bean.getEjbClass();
			}

			IResource resource = WorkbenchResourceHelper.getFile((EObject)srcObject);
			IProject project = resource.getProject();
			IJavaProject javaProject = JavaCore.create(project);
			if(javaProject.exists()){
				IType type = null;
				try {
					//if name is null then can't get type
					if(name != null) {
						type = javaProject.findType( name );
					}
					
					//if type is null then can't open its editor, so open editor for the resource
					if(type != null) {
						ICompilationUnit cu = type.getCompilationUnit();
						EditorUtility.openInEditor(cu);
					} else{
						openAppropriateEditor(resource);
					}
				} catch (JavaModelException e) {
					J2EEUIPlugin.logError(-1, e.getMessage(), e);
				} catch (PartInitException e) {
					J2EEUIPlugin.logError(-1, e.getMessage(), e);
				}

			}
			return;
		}
		
		if (srcObject instanceof EObject) {
			EObject ro = (EObject) srcObject;
			IProject p = ProjectUtilities.getProject(ro);
			
			if (ro instanceof BeanLink) {
				openBeanLinkInJavaEditor((BeanLink) ro, p);
				return;
			}
			IResource resource = WorkbenchResourceHelper.getFile((EObject)srcObject);
			if(resource != null && resource.exists()){
				openAppropriateEditor(resource);
			} else if(ro.eResource() != null) {
				ModuleFile moduleFile = ArchiveUtil.getModuleFile(ro);
				if (moduleFile != null) {
					ArchiveOptions options = moduleFile.getOptions();
					if(options instanceof ComponentArchiveOptions) {
						IVirtualComponent component = ((ComponentArchiveOptions)options).getComponent();
						openAppropriateEditor(component);
					}
				} else {
					//if can't get a ModuleFile then get the component from the archive
					IArchive archive = JavaEEArchiveUtilities.findArchive(ro);
					if(archive != null) {
						IVirtualComponent component = JavaEEArchiveUtilities.findComponent(archive);
						if(component != null){
							openAppropriateEditor(component);
						}
					}
				}
			}
		} else if (srcObject instanceof Resource) {
			openAppropriateEditor(WorkbenchResourceHelper.getFile((Resource)srcObject));
		}
	}

	/**
	 * The structured selection has changed in the workbench. Subclasses should override this method
	 * to react to the change. Returns true if the action should be enabled for this selection, and
	 * false otherwise.
	 * 
	 * When this method is overridden, the super method must always be invoked. If the super method
	 * returns false, this method must also return false.
	 * 
	 * @param sel the new structured selection
	 */
	public boolean updateSelection(IStructuredSelection s) {
		if (!super.updateSelection(s))
			return false;

		// Make sure this is one of the selections we can handle,
		// then set the source object as is. The run() will do the hard stuff.
		Object obj = s.getFirstElement();

		if (obj instanceof J2EEJavaClassProviderHelper) {
			currentDescriptor = getJavaEditorDescriptor();
		} else if (obj instanceof BeanLink) {
			currentDescriptor = getBaseJavaEditorDescriptor();	
		} else if(isEJB3BeanObject(obj)) {
			//[241685] if it is a EJB 3 bean the class is specially opened by the run() method
		} else if (obj instanceof EObject) {
			IEditorRegistry registry = PlatformUI.getWorkbench().getEditorRegistry();
			IFile file = WorkbenchResourceHelper.getFile((EObject)obj);
			if(file != null) {
				if(file.exists()){
					IContentType contentType = IDE.getContentType(file);
					currentDescriptor = registry.getDefaultEditor(file.getName(), contentType);
				} else {
					currentDescriptor = null;
					return false;
				}
			}  else if (((EObject)obj).eResource() != null) {
				//[Bug 237794] if the file is null then it maybe a binary resource in an archive
				//	attempt to get the resource from the archive and the content type from that
				EObject eObj = (EObject) obj;
				IArchive archive = JavaEEArchiveUtilities.findArchive(eObj);
				if(archive != null) {
					IPath path = new Path(((EObject)obj).eResource().getURI().toString());
					if(archive.containsArchiveResource(path)) {
						InputStream stream = null;
						try {
							IArchiveResource resource = archive.getArchiveResource(path);
							stream = resource.getInputStream();
							IContentType type = Platform.getContentTypeManager().findContentTypeFor(stream, path.lastSegment());
							currentDescriptor = registry.getDefaultEditor(path.lastSegment(),type);
						} catch (FileNotFoundException e) {
							J2EEUIPlugin.logError(-1, e.getMessage(), e);
						} catch (IOException e) {
							J2EEUIPlugin.logError(-1, e.getMessage(), e);
						} finally {
							if(stream != null) {
								try {
									stream.close();
								} catch (IOException e) {
									J2EEUIPlugin.logError(-1, e.getMessage(), e);
								}
							}
						}
						
					}
				}
			}
		}
		else if (obj instanceof Resource) {
			IEditorRegistry registry = PlatformUI.getWorkbench().getEditorRegistry();
			IFile file = WorkbenchResourceHelper.getFile((Resource)obj);
			IContentType contentType = IDE.getContentType(file);
			currentDescriptor = registry.getDefaultEditor(file.getName(), contentType);
		}
		else {
			currentDescriptor = null;
			return false;
		}
		setAttributesFromDescriptor();
		srcObject = obj;
		return true;
	}
	
	/**
	 * @param link
	 */
	private void openBeanLinkInJavaEditor(BeanLink link, IProject p) {
		String linkName = null;
		JavaClass javaClass = null;
		IVirtualComponent comp = ComponentUtilities.findComponent(link);
		// Handle EJB Link case
		if (link instanceof EJBLink) {
			linkName = ((EJBLink) link).getEjbLink();
			EJBArtifactEdit artifactEdit = null;
			try {
				artifactEdit = EJBArtifactEdit.getEJBArtifactEditForRead(comp);
				EJBJar ejbJar = artifactEdit.getEJBJar();
				if (ejbJar == null)
					return;
				EnterpriseBean bean = ejbJar.getEnterpriseBeanNamed(linkName);
				if (bean == null)
					return;
				javaClass = bean.getEjbClass();
			} finally {
				if (artifactEdit!=null)
					artifactEdit.dispose();
			}
		}
		// Handle Servlet Link case
		else {
			linkName = ((ServletLink) link).getServletLink();
			WebArtifactEdit artifactEdit = null;
			try {
				artifactEdit = WebArtifactEdit.getWebArtifactEditForRead(comp);
				WebApp webApp = artifactEdit.getWebApp();
			if (webApp == null)
				return;
			Servlet servlet = webApp.getServletNamed(linkName);
			if (servlet == null)
				return;
			javaClass = servlet.getServletClass();
			} finally {
				if (artifactEdit!=null)
					artifactEdit.dispose();
			}
		}
		// Open java editor on the selected objects associated java file
		try {
			J2EEEditorUtility.openInEditor(javaClass, p);
		} catch (Exception cantOpen) {
			J2EEUIPlugin.logError(-1, cantOpen.getMessage(), cantOpen);
		}
	}

	protected EObject getRootObject(Object obj) {
		if (obj instanceof EObject) {
			EObject refObj = (EObject) obj;
			while (refObj != null && refObj.eContainer() != null)
				refObj = refObj.eContainer();
			return refObj;
		}
		return null;
	}
	
	/**
	 * Determines if the given object is a EJB 3 Bean
	 * [241685] first added
	 * 
	 * @param obj determine weather this object is an EJB 3 bean or not
	 * @return true if obj is a EJB 3 bean, false otherwise
	 */
	private boolean isEJB3BeanObject(Object obj) {
		boolean isBean =
			obj instanceof org.eclipse.jst.javaee.ejb.SessionBean ||
			obj instanceof org.eclipse.jst.javaee.ejb.MessageDrivenBean ||
			obj instanceof org.eclipse.jst.javaee.ejb.EntityBean;
		
		return isBean;
	}
}