/*
 * Copyright (c) 2011, 2012 Eike Stepper (Berlin, Germany) 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:
 *     Martin Fluegge - initial API and implementation
 */
package org.eclipse.emf.cdo.dawn.graphiti.wizards;

import org.eclipse.emf.cdo.dawn.graphiti.DawnGraphitiUIPlugin;
import org.eclipse.emf.cdo.dawn.graphiti.editors.DawnGraphitiDiagramEditor;
import org.eclipse.emf.cdo.dawn.graphiti.editors.DawnGraphitiEditorInput;
import org.eclipse.emf.cdo.dawn.graphiti.util.DawnGraphitiUtil;
import org.eclipse.emf.cdo.dawn.preferences.PreferenceConstants;
import org.eclipse.emf.cdo.dawn.ui.composites.CDOResourceNodeChooserComposite.ResourceChooserValidator;
import org.eclipse.emf.cdo.dawn.ui.wizards.DawnCreateNewDiagramResourceWizardPage;
import org.eclipse.emf.cdo.dawn.ui.wizards.DawnCreateNewResourceWizardPage;
import org.eclipse.emf.cdo.dawn.util.connection.CDOConnectionUtil;
import org.eclipse.emf.cdo.session.CDOSession;
import org.eclipse.emf.cdo.view.CDOView;

import org.eclipse.emf.common.command.CommandStack;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.ecore.util.EcoreUtil;
import org.eclipse.emf.transaction.RecordingCommand;
import org.eclipse.emf.transaction.TransactionalEditingDomain;

import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.graphiti.mm.pictograms.Diagram;
import org.eclipse.graphiti.services.Graphiti;
import org.eclipse.graphiti.ui.editor.DiagramEditorInput;
import org.eclipse.graphiti.ui.services.GraphitiUi;
import org.eclipse.jface.dialogs.ErrorDialog;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.wizard.Wizard;
import org.eclipse.ui.INewWizard;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.PlatformUI;

import java.io.IOException;

/**
 * @author Martin Fluegge
 */
public class DawnBasicGraphitiWizard extends Wizard implements INewWizard
{
  protected CDOView view;

  protected DawnCreateNewDiagramResourceWizardPage dawnDiagramModelFilePage;

  protected DawnCreateNewResourceWizardPage dawnDomainModelFilePage;

  protected String diagramExtension = "model_graphiti";

  protected String modelExtension = "model";

  public DawnBasicGraphitiWizard()
  {
    super();
    CDOConnectionUtil.instance.init(PreferenceConstants.getRepositoryName(), PreferenceConstants.getProtocol(),
        PreferenceConstants.getServerName());
    CDOSession session = CDOConnectionUtil.instance.openSession();
    view = CDOConnectionUtil.instance.openView(session);
  }

  public DawnBasicGraphitiWizard(String modelExtension, String diagramExtension)
  {
    this();
    this.diagramExtension = diagramExtension;
    this.modelExtension = modelExtension;
  }

  public void init(IWorkbench workbench, IStructuredSelection selection)
  {
  }

  @Override
  public void addPages()
  {
    dawnDiagramModelFilePage = new DawnCreateNewDiagramResourceWizardPage(diagramExtension, false, view);
    dawnDiagramModelFilePage.setTitle("");
    dawnDiagramModelFilePage.setDescription("");
    dawnDiagramModelFilePage.setCreateAutomaticResourceName(true);
    addPage(dawnDiagramModelFilePage);

    dawnDomainModelFilePage = new DawnCreateNewResourceWizardPage(modelExtension, true, view)
    {
      @Override
      public void setVisible(boolean visible)
      {
        if (visible)
        {
          URI uri = dawnDiagramModelFilePage.getURI();
          String fileName = uri.lastSegment();
          fileName = fileName.substring(0, fileName.length() - ("." + diagramExtension).length()); //$NON-NLS-1$
          fileName += ".acore";
          dawnDomainModelFilePage.setResourceNamePrefix(fileName);
          dawnDomainModelFilePage.setResourcePath(dawnDiagramModelFilePage.getResourcePath());
        }
        super.setVisible(visible);
      }
    };
    dawnDomainModelFilePage.setTitle("");
    dawnDomainModelFilePage.setDescription("");

    // allows to connect to an existing resource
    dawnDomainModelFilePage.setResourceValidationType(ResourceChooserValidator.VALIDATION_WARN);
    addPage(dawnDomainModelFilePage);
  }

  @Override
  public boolean performFinish()
  {
    String diagramTypeId = geTypeId();

    URI diagramResourceURI = dawnDiagramModelFilePage.getURI();
    URI domainModelResourceURI = dawnDomainModelFilePage.getURI();

    Diagram diagram = Graphiti.getPeCreateService().createDiagram(diagramTypeId, diagramResourceURI.lastSegment(),
        true);

    String editorID = DawnGraphitiDiagramEditor.ID;

    TransactionalEditingDomain editingDomain = createEditingDomain(diagramResourceURI, diagram);

    createModelResource(domainModelResourceURI, editingDomain.getResourceSet());

    Resource diagramResource = createDiagramResource(diagramResourceURI, diagram, editingDomain);

    String providerId = GraphitiUi.getExtensionManager().getDiagramTypeProviderId(diagram.getDiagramTypeId());
    DiagramEditorInput editorInput = new DawnGraphitiEditorInput(EcoreUtil.getURI(diagram), providerId,
        diagramResource);

    try
    {
      PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().openEditor(editorInput, editorID);
    }
    catch (PartInitException e)
    {
      String error = "Error opening diagram";
      IStatus status = new Status(IStatus.ERROR, DawnGraphitiUIPlugin.ID, error, e);
      ErrorDialog.openError(getShell(), "Error", null, status);
      return false;
    }

    return true;
  }

  protected String geTypeId()
  {
    return modelExtension;
  }

  private Resource createModelResource(URI uri, ResourceSet resourceSet)
  {
    Resource resource = null;

    // try
    // {
    // resource = resourceSet.getResource(uri, true);
    // }
    // catch (Exception ex)
    // {
    // // ignore
    // }
    //
    // if (resource == null)
    // {
    resource = resourceSet.createResource(uri);
    // }

    return resource;
  }

  private TransactionalEditingDomain createEditingDomain(URI diagramResourceURI, final Diagram diagram)
  {
    final TransactionalEditingDomain editingDomain = DawnGraphitiUtil.createResourceSetAndEditingDomain();

    return editingDomain;
  }

  private Resource createDiagramResource(URI diagramResourceURI, final Diagram diagram,
      final TransactionalEditingDomain editingDomain)
  {
    final ResourceSet resourceSet = editingDomain.getResourceSet();
    final Resource resource = createModelResource(diagramResourceURI, resourceSet);

    final CommandStack commandStack = editingDomain.getCommandStack();
    commandStack.execute(new RecordingCommand(editingDomain)
    {
      @Override
      protected void doExecute()
      {
        resource.getContents().add(diagram);
      }
    });

    try
    {
      resource.save(null);
    }
    catch (IOException ex)
    {
      throw new RuntimeException(ex);
    }
    return resource;
  }

  @Override
  public void dispose()
  {
    view.close();
  }
}