/**
 */
package org.eclipse.emf.cdo.evolution.presentation;

import org.eclipse.emf.cdo.evolution.EvolutionFactory;
import org.eclipse.emf.cdo.evolution.EvolutionPackage;
import org.eclipse.emf.cdo.evolution.provider.EvolutionEditPlugin;

import org.eclipse.emf.common.CommonPlugin;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.EClassifier;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.ecore.resource.impl.ResourceSetImpl;
import org.eclipse.emf.ecore.xmi.XMLResource;
import org.eclipse.emf.edit.ui.provider.ExtendedImageRegistry;

import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IFolder;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.Path;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.wizard.Wizard;
import org.eclipse.jface.wizard.WizardPage;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Label;
import org.eclipse.ui.INewWizard;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.actions.WorkspaceModifyOperation;
import org.eclipse.ui.dialogs.WizardNewFileCreationPage;
import org.eclipse.ui.part.FileEditorInput;
import org.eclipse.ui.part.ISetSelectionTarget;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.MissingResourceException;
import java.util.StringTokenizer;

/**
 * This is a simple wizard for creating a new model file.
 * <!-- begin-user-doc -->
 * <!-- end-user-doc -->
 * @generated
 */
public class EvolutionModelWizard extends Wizard implements INewWizard
{
  /**
   * The supported extensions for created files.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  public static final List<String> FILE_EXTENSIONS = Collections
      .unmodifiableList(Arrays.asList(EvolutionEditorPlugin.INSTANCE.getString("_UI_EvolutionEditorFilenameExtensions").split("\\s*,\\s*")));

  /**
   * A formatted list of supported file extensions, suitable for display.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  public static final String FORMATTED_FILE_EXTENSIONS = EvolutionEditorPlugin.INSTANCE.getString("_UI_EvolutionEditorFilenameExtensions")
      .replaceAll("\\s*,\\s*", ", ");

  /**
   * This caches an instance of the model package.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  protected EvolutionPackage evolutionPackage = EvolutionPackage.eINSTANCE;

  /**
   * This caches an instance of the model factory.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  protected EvolutionFactory evolutionFactory = evolutionPackage.getEvolutionFactory();

  /**
   * This is the file creation page.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  protected EvolutionModelWizardNewFileCreationPage newFileCreationPage;

  /**
   * This is the initial object creation page.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  protected EvolutionModelWizardInitialObjectCreationPage initialObjectCreationPage;

  /**
   * Remember the selection during initialization for populating the default container.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  protected IStructuredSelection selection;

  /**
   * Remember the workbench during initialization.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  protected IWorkbench workbench;

  /**
   * Caches the names of the types that can be created as the root object.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  protected List<String> initialObjectNames;

  /**
   * This just records the information.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  public void init(IWorkbench workbench, IStructuredSelection selection)
  {
    this.workbench = workbench;
    this.selection = selection;
    setWindowTitle(EvolutionEditorPlugin.INSTANCE.getString("_UI_Wizard_label"));
    setDefaultPageImageDescriptor(ExtendedImageRegistry.INSTANCE.getImageDescriptor(EvolutionEditorPlugin.INSTANCE.getImage("full/wizban/NewEvolution")));
  }

  /**
   * Returns the names of the types that can be created as the root object.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  protected Collection<String> getInitialObjectNames()
  {
    if (initialObjectNames == null)
    {
      initialObjectNames = new ArrayList<String>();
      for (EClassifier eClassifier : evolutionPackage.getEClassifiers())
      {
        if (eClassifier instanceof EClass)
        {
          EClass eClass = (EClass)eClassifier;
          if (!eClass.isAbstract())
          {
            initialObjectNames.add(eClass.getName());
          }
        }
      }
      Collections.sort(initialObjectNames, CommonPlugin.INSTANCE.getComparator());
    }
    return initialObjectNames;
  }

  /**
   * Create a new model.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  protected EObject createInitialModel()
  {
    EClass eClass = (EClass)evolutionPackage.getEClassifier(initialObjectCreationPage.getInitialObjectName());
    EObject rootObject = evolutionFactory.create(eClass);
    return rootObject;
  }

  /**
   * Do the work after everything is specified.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  @Override
  public boolean performFinish()
  {
    try
    {
      // Remember the file.
      //
      final IFile modelFile = getModelFile();

      // Do the work within an operation.
      //
      WorkspaceModifyOperation operation = new WorkspaceModifyOperation()
      {
        @Override
        protected void execute(IProgressMonitor progressMonitor)
        {
          try
          {
            // Create a resource set
            //
            ResourceSet resourceSet = new ResourceSetImpl();

            // Get the URI of the model file.
            //
            URI fileURI = URI.createPlatformResourceURI(modelFile.getFullPath().toString(), true);

            // Create a resource for this file.
            //
            Resource resource = resourceSet.createResource(fileURI);

            // Add the initial model object to the contents.
            //
            EObject rootObject = createInitialModel();
            if (rootObject != null)
            {
              resource.getContents().add(rootObject);
            }

            // Save the contents of the resource to the file system.
            //
            Map<Object, Object> options = new HashMap<Object, Object>();
            options.put(XMLResource.OPTION_ENCODING, initialObjectCreationPage.getEncoding());
            resource.save(options);
          }
          catch (Exception exception)
          {
            EvolutionEditorPlugin.INSTANCE.log(exception);
          }
          finally
          {
            progressMonitor.done();
          }
        }
      };

      getContainer().run(false, false, operation);

      // Select the new file resource in the current view.
      //
      IWorkbenchWindow workbenchWindow = workbench.getActiveWorkbenchWindow();
      IWorkbenchPage page = workbenchWindow.getActivePage();
      final IWorkbenchPart activePart = page.getActivePart();
      if (activePart instanceof ISetSelectionTarget)
      {
        final ISelection targetSelection = new StructuredSelection(modelFile);
        getShell().getDisplay().asyncExec(new Runnable()
        {
          public void run()
          {
            ((ISetSelectionTarget)activePart).selectReveal(targetSelection);
          }
        });
      }

      // Open an editor on the new file.
      //
      try
      {
        page.openEditor(new FileEditorInput(modelFile), workbench.getEditorRegistry().getDefaultEditor(modelFile.getFullPath().toString()).getId());
      }
      catch (PartInitException exception)
      {
        MessageDialog.openError(workbenchWindow.getShell(), EvolutionEditorPlugin.INSTANCE.getString("_UI_OpenEditorError_label"), exception.getMessage());
        return false;
      }

      return true;
    }
    catch (Exception exception)
    {
      EvolutionEditorPlugin.INSTANCE.log(exception);
      return false;
    }
  }

  /**
   * This is the one page of the wizard.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  public class EvolutionModelWizardNewFileCreationPage extends WizardNewFileCreationPage
  {
    /**
     * Pass in the selection.
     * <!-- begin-user-doc -->
     * <!-- end-user-doc -->
     * @generated
     */
    public EvolutionModelWizardNewFileCreationPage(String pageId, IStructuredSelection selection)
    {
      super(pageId, selection);
    }

    /**
     * The framework calls this to see if the file is correct.
     * <!-- begin-user-doc -->
     * <!-- end-user-doc -->
     * @generated
     */
    @Override
    protected boolean validatePage()
    {
      if (super.validatePage())
      {
        String extension = new Path(getFileName()).getFileExtension();
        if (extension == null || !FILE_EXTENSIONS.contains(extension))
        {
          String key = FILE_EXTENSIONS.size() > 1 ? "_WARN_FilenameExtensions" : "_WARN_FilenameExtension";
          setErrorMessage(EvolutionEditorPlugin.INSTANCE.getString(key, new Object[] { FORMATTED_FILE_EXTENSIONS }));
          return false;
        }
        return true;
      }
      return false;
    }

    /**
     * <!-- begin-user-doc -->
     * <!-- end-user-doc -->
     * @generated
     */
    public IFile getModelFile()
    {
      return ResourcesPlugin.getWorkspace().getRoot().getFile(getContainerFullPath().append(getFileName()));
    }
  }

  /**
   * This is the page where the type of object to create is selected.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  public class EvolutionModelWizardInitialObjectCreationPage extends WizardPage
  {
    /**
     * <!-- begin-user-doc -->
     * <!-- end-user-doc -->
     * @generated
     */
    protected Combo initialObjectField;

    /**
     * @generated
     * <!-- begin-user-doc -->
     * <!-- end-user-doc -->
     */
    protected List<String> encodings;

    /**
     * <!-- begin-user-doc -->
     * <!-- end-user-doc -->
     * @generated
     */
    protected Combo encodingField;

    /**
     * Pass in the selection.
     * <!-- begin-user-doc -->
     * <!-- end-user-doc -->
     * @generated
     */
    public EvolutionModelWizardInitialObjectCreationPage(String pageId)
    {
      super(pageId);
    }

    /**
     * <!-- begin-user-doc -->
     * <!-- end-user-doc -->
     * @generated
     */
    public void createControl(Composite parent)
    {
      Composite composite = new Composite(parent, SWT.NONE);
      {
        GridLayout layout = new GridLayout();
        layout.numColumns = 1;
        layout.verticalSpacing = 12;
        composite.setLayout(layout);

        GridData data = new GridData();
        data.verticalAlignment = GridData.FILL;
        data.grabExcessVerticalSpace = true;
        data.horizontalAlignment = GridData.FILL;
        composite.setLayoutData(data);
      }

      Label containerLabel = new Label(composite, SWT.LEFT);
      {
        containerLabel.setText(EvolutionEditorPlugin.INSTANCE.getString("_UI_ModelObject"));

        GridData data = new GridData();
        data.horizontalAlignment = GridData.FILL;
        containerLabel.setLayoutData(data);
      }

      initialObjectField = new Combo(composite, SWT.BORDER);
      {
        GridData data = new GridData();
        data.horizontalAlignment = GridData.FILL;
        data.grabExcessHorizontalSpace = true;
        initialObjectField.setLayoutData(data);
      }

      for (String objectName : getInitialObjectNames())
      {
        initialObjectField.add(getLabel(objectName));
      }

      if (initialObjectField.getItemCount() == 1)
      {
        initialObjectField.select(0);
      }
      initialObjectField.addModifyListener(validator);

      Label encodingLabel = new Label(composite, SWT.LEFT);
      {
        encodingLabel.setText(EvolutionEditorPlugin.INSTANCE.getString("_UI_XMLEncoding"));

        GridData data = new GridData();
        data.horizontalAlignment = GridData.FILL;
        encodingLabel.setLayoutData(data);
      }
      encodingField = new Combo(composite, SWT.BORDER);
      {
        GridData data = new GridData();
        data.horizontalAlignment = GridData.FILL;
        data.grabExcessHorizontalSpace = true;
        encodingField.setLayoutData(data);
      }

      for (String encoding : getEncodings())
      {
        encodingField.add(encoding);
      }

      encodingField.select(0);
      encodingField.addModifyListener(validator);

      setPageComplete(validatePage());
      setControl(composite);
    }

    /**
     * <!-- begin-user-doc -->
     * <!-- end-user-doc -->
     * @generated
     */
    protected ModifyListener validator = new ModifyListener()
    {
      public void modifyText(ModifyEvent e)
      {
        setPageComplete(validatePage());
      }
    };

    /**
     * <!-- begin-user-doc -->
     * <!-- end-user-doc -->
     * @generated
     */
    protected boolean validatePage()
    {
      return getInitialObjectName() != null && getEncodings().contains(encodingField.getText());
    }

    /**
     * <!-- begin-user-doc -->
     * <!-- end-user-doc -->
     * @generated
     */
    @Override
    public void setVisible(boolean visible)
    {
      super.setVisible(visible);
      if (visible)
      {
        if (initialObjectField.getItemCount() == 1)
        {
          initialObjectField.clearSelection();
          encodingField.setFocus();
        }
        else
        {
          encodingField.clearSelection();
          initialObjectField.setFocus();
        }
      }
    }

    /**
     * <!-- begin-user-doc -->
     * <!-- end-user-doc -->
     * @generated
     */
    public String getInitialObjectName()
    {
      String label = initialObjectField.getText();

      for (String name : getInitialObjectNames())
      {
        if (getLabel(name).equals(label))
        {
          return name;
        }
      }
      return null;
    }

    /**
     * <!-- begin-user-doc -->
     * <!-- end-user-doc -->
     * @generated
     */
    public String getEncoding()
    {
      return encodingField.getText();
    }

    /**
     * Returns the label for the specified type name.
     * <!-- begin-user-doc -->
     * <!-- end-user-doc -->
     * @generated
     */
    protected String getLabel(String typeName)
    {
      try
      {
        return EvolutionEditPlugin.INSTANCE.getString("_UI_" + typeName + "_type");
      }
      catch (MissingResourceException mre)
      {
        EvolutionEditorPlugin.INSTANCE.log(mre);
      }
      return typeName;
    }

    /**
     * <!-- begin-user-doc -->
     * <!-- end-user-doc -->
     * @generated
     */
    protected Collection<String> getEncodings()
    {
      if (encodings == null)
      {
        encodings = new ArrayList<String>();
        for (StringTokenizer stringTokenizer = new StringTokenizer(EvolutionEditorPlugin.INSTANCE.getString("_UI_XMLEncodingChoices")); stringTokenizer
            .hasMoreTokens();)
        {
          encodings.add(stringTokenizer.nextToken());
        }
      }
      return encodings;
    }
  }

  /**
   * The framework calls this to create the contents of the wizard.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  @Override
  public void addPages()
  {
    // Create a page, set the title, and the initial model file name.
    //
    newFileCreationPage = new EvolutionModelWizardNewFileCreationPage("Whatever", selection);
    newFileCreationPage.setTitle(EvolutionEditorPlugin.INSTANCE.getString("_UI_EvolutionModelWizard_label"));
    newFileCreationPage.setDescription(EvolutionEditorPlugin.INSTANCE.getString("_UI_EvolutionModelWizard_description"));
    newFileCreationPage.setFileName(EvolutionEditorPlugin.INSTANCE.getString("_UI_EvolutionEditorFilenameDefaultBase") + "." + FILE_EXTENSIONS.get(0));
    addPage(newFileCreationPage);

    // Try and get the resource selection to determine a current directory for the file dialog.
    //
    if (selection != null && !selection.isEmpty())
    {
      // Get the resource...
      //
      Object selectedElement = selection.iterator().next();
      if (selectedElement instanceof IResource)
      {
        // Get the resource parent, if its a file.
        //
        IResource selectedResource = (IResource)selectedElement;
        if (selectedResource.getType() == IResource.FILE)
        {
          selectedResource = selectedResource.getParent();
        }

        // This gives us a directory...
        //
        if (selectedResource instanceof IFolder || selectedResource instanceof IProject)
        {
          // Set this for the container.
          //
          newFileCreationPage.setContainerFullPath(selectedResource.getFullPath());

          // Make up a unique new name here.
          //
          String defaultModelBaseFilename = EvolutionEditorPlugin.INSTANCE.getString("_UI_EvolutionEditorFilenameDefaultBase");
          String defaultModelFilenameExtension = FILE_EXTENSIONS.get(0);
          String modelFilename = defaultModelBaseFilename + "." + defaultModelFilenameExtension;
          for (int i = 1; ((IContainer)selectedResource).findMember(modelFilename) != null; ++i)
          {
            modelFilename = defaultModelBaseFilename + i + "." + defaultModelFilenameExtension;
          }
          newFileCreationPage.setFileName(modelFilename);
        }
      }
    }
    initialObjectCreationPage = new EvolutionModelWizardInitialObjectCreationPage("Whatever2");
    initialObjectCreationPage.setTitle(EvolutionEditorPlugin.INSTANCE.getString("_UI_EvolutionModelWizard_label"));
    initialObjectCreationPage.setDescription(EvolutionEditorPlugin.INSTANCE.getString("_UI_Wizard_initial_object_description"));
    addPage(initialObjectCreationPage);
  }

  /**
   * Get the file from the page.
   * <!-- begin-user-doc -->
   * <!-- end-user-doc -->
   * @generated
   */
  public IFile getModelFile()
  {
    return newFileCreationPage.getModelFile();
  }

}