/**
 * 
 */
package org.eclipse.epf.diagramming.base.commands;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.emf.common.command.Command;
import org.eclipse.emf.common.command.CompoundCommand;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.edit.command.CopyCommand.Helper;
import org.eclipse.emf.transaction.Transaction;
import org.eclipse.emf.transaction.TransactionalEditingDomain;
import org.eclipse.emf.transaction.impl.InternalTransactionalEditingDomain;
import org.eclipse.epf.diagramming.base.persistence.DiagramFileCreatorEx;
import org.eclipse.epf.diagramming.base.persistence.DiagramService;
import org.eclipse.epf.diagramming.base.persistence.IDiagramService;
import org.eclipse.epf.diagramming.base.util.DiagramEditorUtil;
import org.eclipse.epf.library.edit.command.INestedCommandProvider;
import org.eclipse.epf.library.edit.process.command.ActivityDropCommand;
import org.eclipse.epf.library.edit.process.command.OBSDropCommand;
import org.eclipse.epf.library.edit.process.command.PBSDropCommand;
import org.eclipse.epf.library.edit.process.command.WBSDropCommand;
import org.eclipse.epf.library.edit.ui.IActionTypeProvider;
import org.eclipse.epf.uma.Activity;
import org.eclipse.epf.uma.TaskDescriptor;
import org.eclipse.gmf.runtime.common.core.command.CommandResult;
import org.eclipse.gmf.runtime.emf.commands.core.command.AbstractTransactionalCommand;
import org.eclipse.gmf.runtime.emf.core.GMFEditingDomainFactory;
import org.eclipse.gmf.runtime.notation.Diagram;
import org.eclipse.swt.widgets.Display;

/**
 * @author Shashidhar Kannoori
 *
 */
public class NestedCommandProvider implements INestedCommandProvider {

	/* (non-Javadoc)
	 * @see org.eclipse.epf.library.edit.command.INestedCommandProvider#createNestedCommand(org.eclipse.emf.common.command.Command)
	 */
	public Command createNestedCommand(Command command) {
		
		if(command instanceof ActivityDropCommand){
			ActivityDropCommand dropcommand = (ActivityDropCommand)command;
			if(dropcommand.getActivityHandler() == null) return null;
			if(IActionTypeProvider.COPY != dropcommand.getType())
				return null;
			// TODO : Handle for deepcopy and copying different diagrams.
//			if(IActionTypeProvider.DEEP_COPY == dropcommand.getType()
//					&&!dropcommand.getActivityHandler().getDeepCopies().isEmpty()){
//				List list = dropcommand.getActivityHandler().getDeepCopies();
//				for (Iterator iter = list.iterator(); iter.hasNext();) {
//					Activity copyAct = (Activity) iter.next();
//					Activity origAct = (Activity)dropcommand.getActivityHandler()
//								.getDeepCopyToOriginalMap().get(copyAct);
//				}
//			}
			
			Helper copiedHelper = dropcommand.getActivityHandler().getCopyHelper();
			Set keys = copiedHelper.keySet();
			
			InternalTransactionalEditingDomain editingDomain = (InternalTransactionalEditingDomain)GMFEditingDomainFactory.INSTANCE
													.createEditingDomain();
			Resource resource = getResource(dropcommand, editingDomain);
			CompoundCommand compoundCommand = new CompoundCommand(CompoundCommand.MERGE_COMMAND_ALL);
			
			for (Iterator iter = keys.iterator(); iter.hasNext();) {
				EObject key = (EObject) iter.next();
				EObject entry = (EObject)copiedHelper.get(key);
				if(entry instanceof Activity && key instanceof Activity){
					Activity act = (Activity)entry;
					//TODO: Handle different diagrams.
					Diagram diagram = IDiagramService.eInstance.getDiagram((Activity)key, DiagramService.AD_kind, 
							false, new NullProgressMonitor());
					if(diagram != null){
						DiagramCopyCommand dcc = new DiagramCopyCommand(editingDomain,
								diagram, (Activity)key, act, resource, copiedHelper);
						compoundCommand.append(dcc);
					}
				}
			}
			if(!compoundCommand.isEmpty()){
				return compoundCommand;
			}
		}
		
		return null;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.epf.library.edit.command.INestedCommandProvider#createRelatedObjects(java.util.Collection, org.eclipse.emf.common.command.Command)
	 */
	public Command createRelatedObjects(Collection createdElements,
			Command createCommand) {
		if(createCommand instanceof WBSDropCommand 
				|| createCommand instanceof OBSDropCommand
				|| createCommand instanceof PBSDropCommand){
			Collection taskCollection = new ArrayList();
			for (Iterator iter = taskCollection.iterator(); iter.hasNext();) {
				Object e = (Object) iter.next();
				if(e instanceof TaskDescriptor){
					taskCollection.add(e);
				}
			}
			if(taskCollection != null){
//				InternalTransactionalEditingDomain domain = 
//					(InternalTransactionalEditingDomain)GMFEditingDomainFactory.getInstance().createEditingDomain();
				//return new CopyNodeCommand()
			}
		}
		return null;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.epf.library.edit.command.INestedCommandProvider#removeRelatedObjects(java.util.Collection, org.eclipse.emf.common.command.Command)
	 */
	public Command removeRelatedObjects(Collection deletedElements,
			Command deleteCommand) {
		// TODO Auto-generated method stub
		return null;
	}
	
	private Resource getResource(ActivityDropCommand dropcommand, 
			InternalTransactionalEditingDomain editingDomain){
		
		Map options = new HashMap();
		options.put(Transaction.OPTION_NO_NOTIFICATIONS,  Boolean.TRUE);
		Activity p = dropcommand.getActivity();
		IFile file = DiagramEditorUtil.getFile(DiagramEditorUtil.default_file_name, 
				p, DiagramFileCreatorEx.getInstance());
		if(file == null){
			file = DiagramEditorUtil.createNewDiagramFile(DiagramFileCreatorEx.getInstance(), 
					p, Display.getCurrent().getActiveShell(), 
					new NullProgressMonitor());
		}
		ResourceSet resourceSet = editingDomain.getResourceSet();
		final Resource diagramResource = resourceSet
				.createResource(URI.createPlatformResourceURI(file
						.getFullPath().toString()));
		//affectedFiles.add(file);
		//editingDomain.startTransaction(false, options);
		return diagramResource;
	}
	
	private class UpdateResource extends AbstractTransactionalCommand {
		
		private Helper copyHelper;
		private Resource resource;

		public UpdateResource(TransactionalEditingDomain
				domain, String label, List affectedFiles, Helper copyHelper, Map options,
				Resource resource){
			super(domain,  label, options, affectedFiles);
			this.copyHelper = copyHelper;
			this.resource = resource;
		}
	
		protected CommandResult doExecuteWithResult(IProgressMonitor monitor,
				IAdaptable info) throws ExecutionException {


			// Need to move this code to different place.
			Set xKeys = copyHelper.keySet();
			for (Iterator iter = xKeys.iterator(); iter.hasNext();) {
				EObject element = (EObject) iter.next();
				EObject copy  = (EObject)copyHelper.get(element);
				if(element instanceof Diagram || element instanceof org.eclipse.uml2.uml.Activity){
					resource.getContents().add(((Diagram)copy).getElement());
					resource.getContents().add(copy);
				}
			}
			try{
				resource.save(Collections.EMPTY_MAP);
			}catch(Exception e){
				e.printStackTrace();
			}
			return CommandResult.newOKCommandResult();
		}
	
	};

}