/*******************************************************************************
 * 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.navigator.internal.dnd;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.commands.operations.IUndoableOperation;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IWorkspaceRoot;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.jem.util.emf.workbench.ProjectUtilities;
import org.eclipse.jface.util.LocalSelectionTransfer;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jst.j2ee.application.internal.operations.AddComponentToEnterpriseApplicationDataModelProvider;
import org.eclipse.jst.j2ee.application.internal.operations.IAddComponentToEnterpriseApplicationDataModelProperties;
import org.eclipse.jst.j2ee.internal.common.J2EEVersionUtil;
import org.eclipse.jst.j2ee.internal.navigator.ui.Messages;
import org.eclipse.jst.j2ee.internal.plugin.IJ2EEModuleConstants;
import org.eclipse.jst.j2ee.internal.project.J2EEProjectUtilities;
import org.eclipse.jst.j2ee.internal.provider.J2EEItemProvider;
import org.eclipse.jst.j2ee.navigator.internal.plugin.J2EENavigatorPlugin;
import org.eclipse.jst.j2ee.project.EarUtilities;
import org.eclipse.jst.j2ee.project.JavaEEProjectUtilities;
import org.eclipse.jst.j2ee.project.facet.IJ2EEFacetConstants;
import org.eclipse.osgi.util.NLS;
import org.eclipse.swt.dnd.DropTargetEvent;
import org.eclipse.swt.dnd.TransferData;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.navigator.CommonDropAdapter;
import org.eclipse.ui.navigator.CommonDropAdapterAssistant;
import org.eclipse.ui.part.PluginTransfer;
import org.eclipse.ui.progress.IProgressService;
import org.eclipse.wst.common.componentcore.ComponentCore;
import org.eclipse.wst.common.componentcore.datamodel.properties.ICreateReferenceComponentsDataModelProperties;
import org.eclipse.wst.common.componentcore.resources.IVirtualComponent;
import org.eclipse.wst.common.frameworks.datamodel.DataModelFactory;
import org.eclipse.wst.common.frameworks.datamodel.IDataModel;
import org.eclipse.wst.common.project.facet.core.IFacetedProject;
import org.eclipse.wst.common.project.facet.core.IProjectFacetVersion;
import org.eclipse.wst.common.project.facet.core.ProjectFacetsManager;

public class AddProjectToEARDropAssistant extends CommonDropAdapterAssistant {

	private static final Class IPROJECT_CLASS = IProject.class;

	public AddProjectToEARDropAssistant() {
		super();
	}
	
	@Override
	public boolean isSupportedType(TransferData aTransferType) {	
		return LocalSelectionTransfer.getTransfer().isSupportedType(aTransferType);
	}

	@Override
	public IStatus handleDrop(CommonDropAdapter aDropAdapter, DropTargetEvent aDropTargetEvent, final Object aTarget) {

		if (LocalSelectionTransfer.getTransfer().isSupportedType(aDropAdapter.getCurrentTransfer())) {

			final IStructuredSelection selection = (IStructuredSelection) LocalSelectionTransfer.getTransfer().getSelection();
			IProgressService service = PlatformUI.getWorkbench().getProgressService();
			
			IProject earProject = getProject(aTarget);
			IVirtualComponent earComponent = ComponentCore.createComponent(earProject);

			Job addProjectToEarJob = new Job(getJobTitle(earComponent)) {
				@Override
				protected IStatus run(IProgressMonitor monitor) {

					IStatus status = null;
					try {
						IProject earProject = getProject(aTarget);

						List projects = new ArrayList();
						 
						for (Iterator selectionIterator = selection.iterator(); selectionIterator.hasNext();) {
							Object sourceObject = selectionIterator.next();

							IProject projectToAdd = getProject(sourceObject);
							if (projectToAdd != null) 
								projects.add(projectToAdd); 
						}

						IDataModel dataModel = getAddModuleDataModel(earProject, projects);
						IUndoableOperation dropOperation = dataModel.getDefaultOperation();
						status = dropOperation.execute(monitor, null);

						if (!status.isOK())
							return status;
					} catch (ExecutionException e) {
						String msg = e.getMessage() != null ? e.getMessage() : e.toString();
						status = J2EENavigatorPlugin.createErrorStatus(0, msg, e);
					}
					return status;
				}
			};
			service.showInDialog(PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell(), addProjectToEarJob);
			addProjectToEarJob.setRule(ResourcesPlugin.getWorkspace().getRoot());
			addProjectToEarJob.schedule();
		}
		return Status.OK_STATUS;
	}

	@Override
	public IStatus validateDrop(Object target, int operation, TransferData transferType) {

		if (LocalSelectionTransfer.getTransfer().isSupportedType(transferType) || PluginTransfer.getInstance().isSupportedType(transferType)) {
			ISelection selection = LocalSelectionTransfer.getTransfer().getSelection();
			if (selection != null && !selection.isEmpty() && (selection instanceof IStructuredSelection)) {
				
				IStructuredSelection structuredSelection = (IStructuredSelection) selection;
				IProject earProject = getProject(target);
				int earVersion = getEarVersion(earProject);
				IStatus status = null;
				for(Iterator iterator = structuredSelection.iterator(); iterator.hasNext();) {
					Object next = iterator.next();
					IProject projectToAdd = getProject(next);
					if( (status = validateProjectMayBeAdded(earProject, projectToAdd, earVersion)).isOK()) 
						return status;
				}
			}
			
		}
		return Status.CANCEL_STATUS;
	}

	/**
	 * @param target
	 */
	private IStatus validateProjectMayBeAdded(IProject earProject, IProject projectToAdd, int earVersion) {
		
		if (earProject == null || projectToAdd == null || earVersion < 0)
			return J2EENavigatorPlugin.createErrorStatus(0, Messages.AddProjectToEARDropAssistant_Could_not_add_module_to_Enterprise_, null);
		else if (!earProject.isAccessible()) {
			return J2EENavigatorPlugin.createErrorStatus(0, NLS.bind(Messages.AddProjectToEARDropAssistant_The_project_0_cannot_be_accesse_, earProject.getName()), null);
		} else if (!projectToAdd.isAccessible()) {
			return J2EENavigatorPlugin.createErrorStatus(0, Messages.AddProjectToEARDropAssistant_The_dragged_project_cannot_be_added_, null);
		}
		else if (earVersion > 14){
			return J2EENavigatorPlugin.createErrorStatus(0, Messages.AddProjectToEARDropAssistant_Could_not_add_module_to_Enterprise_, null);
		}

		IStatus isValid = validateProjectToAdd(projectToAdd, earVersion);
		if (!isValid.isOK()) {
			return isValid;
		}
		// TODO Check if the project is already attached to the *.ear
		// if (editModel.hasMappingToProject(projectToAdd)) {
		// return false;
		// } 
		return Status.OK_STATUS;
	}	
	
	/**
	 * 
	 * @return -1 on error 
	 */
	protected final int getEarVersion(IProject earProject) {
		int earVersion = -1;
		
	    IFacetedProject facetedProject;
		try {
			facetedProject = ProjectFacetsManager.create(earProject);
			 IProjectFacetVersion version = facetedProject.getProjectFacetVersion(EarUtilities.ENTERPRISE_APPLICATION_FACET);
			 earVersion = J2EEVersionUtil.convertVersionStringToInt(version.getVersionString());
		} catch (CoreException e) {
			//nothing to do version cannot be determined since there is a problem with faceted project. 
			J2EENavigatorPlugin.logError(0, e.getMessage(), e);
		}
		return earVersion;
	}
		
	/**
	 * @param facetedProject
	 * @return
	 */
	protected final boolean hasEarFacet(IProject project) {
		IFacetedProject facetedProject = null;
		try {
			facetedProject = ProjectFacetsManager.create(project);
		} catch (CoreException e1) { 
		}
		return facetedProject != null && facetedProject.hasProjectFacet(IJ2EEFacetConstants.ENTERPRISE_APPLICATION_FACET);
	}

	protected final String calculateValidProjectName(final String originalName) { 

		IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
		String validName = originalName;
		int count = 1;
		while (root.getProject(validName).exists()) {
			validName = originalName + count++;
		}
		return validName;					
	}
	
	protected IDataModel getAddModuleDataModel(IProject earProject, List projects) {
		IDataModel datamodel = DataModelFactory.createDataModel(new AddComponentToEnterpriseApplicationDataModelProvider());
		
		IVirtualComponent earComponent = ComponentCore.createComponent(earProject);
		Map componentToURIMap = new HashMap();
		List components = new ArrayList();
		IVirtualComponent moduleComponent = null;
		for(Iterator itr = projects.iterator(); itr.hasNext(); ) {
			moduleComponent = ComponentCore.createComponent((IProject)itr.next()); 
			components.add(moduleComponent);
			componentToURIMap.put(moduleComponent, getDefaultURI(moduleComponent)); 
		}		
		datamodel.setProperty(ICreateReferenceComponentsDataModelProperties.SOURCE_COMPONENT, earComponent);
		datamodel.setProperty(ICreateReferenceComponentsDataModelProperties.TARGET_COMPONENT_LIST, components);		
		datamodel.setProperty(IAddComponentToEnterpriseApplicationDataModelProperties.TARGET_COMPONENTS_TO_URI_MAP, componentToURIMap);
		return datamodel;
	}

	protected String getJobTitle(IVirtualComponent earComponent) { 
		return NLS.bind(Messages.AddModuleToEarDropAssistant_Adding_module_to_ea_, earComponent.getName());
	}  
	
	protected IStatus validateProjectToAdd(IProject projectToAdd, int earVersion) {
		try {
			// check if the project to add is not an EAR itself
			IFacetedProject facetedProject = ProjectFacetsManager.create(projectToAdd);  
			if( facetedProject.hasProjectFacet(IJ2EEFacetConstants.ENTERPRISE_APPLICATION_FACET) ) 
				return Status.CANCEL_STATUS;
			
			// check if the project to add is with Java EE version equal or lesser than that of the EAR
			String verStr = J2EEProjectUtilities.getJ2EEProjectVersion(projectToAdd);
			if (verStr != null) {
				int version;
				if (JavaEEProjectUtilities.isApplicationClientProject(projectToAdd))
					version = J2EEVersionUtil.convertAppClientVersionStringToJ2EEVersionID(verStr);
				else if (JavaEEProjectUtilities.isEJBProject(projectToAdd))
					version = J2EEVersionUtil.convertEJBVersionStringToJ2EEVersionID(verStr);
				else if (JavaEEProjectUtilities.isDynamicWebProject(projectToAdd))
					version = J2EEVersionUtil.convertWebVersionStringToJ2EEVersionID(verStr);
				else if (JavaEEProjectUtilities.isJCAProject(projectToAdd))
					version = J2EEVersionUtil.convertConnectorVersionStringToJ2EEVersionID(verStr);
				else 
					version = J2EEVersionUtil.convertVersionStringToInt(verStr);
				
				if (version > earVersion) 
					return Status.CANCEL_STATUS;
			}
		} catch (CoreException e) {
			String msg = e.getMessage() != null ? e.getMessage() : e.toString();
			return J2EENavigatorPlugin.createErrorStatus(0, msg, e);
		}
		return Status.OK_STATUS;
		 
	}

	protected static IProject getProject(Object element) {
		if (element == null)
			return null;
		IProject project = null;
		if (element instanceof IAdaptable)
			project = (IProject) ((IAdaptable) element).getAdapter(IPROJECT_CLASS);
		else
			project = (IProject) Platform.getAdapterManager().getAdapter(element, IPROJECT_CLASS);
		if (project == null) {
			if(element instanceof EObject) {
				project = ProjectUtilities.getProject((EObject) element);
			} else if (element instanceof J2EEItemProvider) {
				IFile associatedFile = ((J2EEItemProvider)element).getAssociatedFile();
				if(associatedFile != null)
					project = associatedFile.getProject();				
			}
		}
		return project;
	}

	protected static String getDefaultURI(IVirtualComponent component) {
		IProject project = component.getProject();
		String name = component.getName();

		if (JavaEEProjectUtilities.isDynamicWebProject(project)) {
			name += IJ2EEModuleConstants.WAR_EXT;
		} else if (JavaEEProjectUtilities.isEARProject(project)) {
			name += IJ2EEModuleConstants.EAR_EXT;
		} else if (JavaEEProjectUtilities.isJCAProject(project)) {
			name += IJ2EEModuleConstants.RAR_EXT;
		} else {
			name += IJ2EEModuleConstants.JAR_EXT;
		}
		return name;
	}

}