/*******************************************************************************
 * Copyright (c) 2001, 2004 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.wst.xml.ui.internal.wizards;

import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.wizard.Wizard;
import org.eclipse.jface.wizard.WizardPage;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IEditorDescriptor;
import org.eclipse.ui.IEditorRegistry;
import org.eclipse.ui.INewWizard;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.dialogs.WizardNewFileCreationPage;

public class NewModelWizard extends Wizard implements INewWizard
{
  
  protected IStructuredSelection selection;
  protected IWorkbench workbench;
  protected String currentDirectory;

  public NewModelWizard()
  {
  }

  public void init(IWorkbench workbench, IStructuredSelection selection)
  {
    this.workbench = workbench;
    this.selection = selection;
  }

  public boolean performFinish()
  {
    boolean result = true;
    WizardPage currentPage = (WizardPage)getContainer().getCurrentPage();
    if (currentPage != null)
    {
      result = currentPage.isPageComplete();
    }
    return result;
  }

  /**
   * showFileDialog
   */
  public FileDialog showFileDialog(Shell shell, String defaultDirectory, String defaultFile, String [] filterExtensions)
  {
    FileDialog fileDialog = new FileDialog(shell, SWT.OPEN);

    // Get the last visit directory if we haven't defined a particular one here.
    if (defaultDirectory == null || defaultDirectory.length() == 0)
    {
      //defaultDirectory = Locate.instance(this).getLastSelectedDirectory(getResourcePath());
    }

    if (defaultDirectory != null && defaultDirectory.length() != 0)
    {
      fileDialog.setFilterPath(defaultDirectory);
    }

    fileDialog.setFileName(defaultFile);
    fileDialog.setFilterExtensions(filterExtensions);

    fileDialog.open();

    return fileDialog;
  }


  public void setCurrentDirectory(String currentDirectory)
  {
    this.currentDirectory = currentDirectory;
  }


  public void createWorkbenchResource(IContainer container, String fileName)
  {
    IPath path = container.getFullPath();
    path = path.append(fileName);
    IFile file = container.getWorkspace().getRoot().getFile(path);
    if (!file.exists())
    {
      try
      {
        file.create(null, true, null);
      }
      catch (CoreException e)
      {
        //XMLBuilderPlugin.getPlugin().getMsgLogger().write("Encountered exception creating file: " + e.getMessage());
      }
    }
  }

  /**
   * StartPage
   */
  public class StartPage extends WizardPage implements Listener
  {
    protected int selectedButton;
    protected String[] radioButtonLabel;
    protected Button[] radioButton;

    public StartPage(String pageName, String[] radioButtonLabel)
    {
      super(pageName);
      this.radioButtonLabel = radioButtonLabel;
      radioButton = new Button[radioButtonLabel.length];
    }

    public Button getRadioButtonAtIndex(int i)
    {
      Button result = null;
      if (i >= 0 && i < radioButton.length)
      {
        result = radioButton[i];
      }
      return result;
    }

    public int getSelectedRadioButtonIndex()
    {
      int result = -1;
      for (int i = 0; i < radioButton.length; i++)
      {
        if (radioButton[i].getSelection())
        {
          result = i;
        }
      }
      return result;
    }

    public void createControl(Composite parent)
    {
      Composite base = new Composite(parent, SWT.NONE);
      //TODO... setHelp
      //WorkbenchHelp.setHelp(base, XMLBuilderContextIds.XMLC_CREATE_PAGE);
      base.setLayout(new GridLayout());

      //radio buttons' container	
      Composite radioButtonsGroup = new Composite(base, SWT.NONE);
      GridLayout layout = new GridLayout();
      layout.numColumns = 1;
      layout.makeColumnsEqualWidth = true;
      layout.marginWidth = 0;                

      radioButtonsGroup.setLayout(layout);
      GridData gd = new GridData(GridData.FILL_BOTH);
      gd.heightHint = 300;
      gd.widthHint = 400;
      radioButtonsGroup.setLayoutData(gd);
      //TODO... set help
      //WorkbenchHelp.setHelp(radioButtonsGroup, XMLBuilderContextIds.XMLC_RADIO_GROUP);

      for (int i = 0; i < radioButtonLabel.length; i++)
      {
        radioButton[i] = new Button(radioButtonsGroup, SWT.RADIO);
        radioButton[i].setText(radioButtonLabel[i]);
        radioButton[i].setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
        //TODO... set help
        //WorkbenchHelp.setHelp(radioButton[i], new ControlContextComputer(radioButton[i], XMLBuilderContextIds.XMLC_RADIO_BUTTON));
        //radioButton[i].addListener(SWT.Modify, this);
      }
      setControl(base);
      setPageComplete(isPageComplete());
    }

    public void handleEvent(Event event)
    {
      if (event.type == SWT.Modify)
      {
        setPageComplete(isPageComplete());
      }
    }
  }


  /**
   *  NewFilePage
   */
  public class NewFilePage extends WizardNewFileCreationPage
  {
    public String defaultName = "NewFile";
    public String defaultFileExtension = ".txt";
    public String[] filterExtensions = { "*.txt"};

    public NewFilePage(IStructuredSelection selection)
    {
      super("", selection);
    }

    protected String computeDefaultFileName()
    {
      int count = 0;
      String fileName = defaultName + defaultFileExtension;
      IPath containerFullPath = getContainerFullPath();
      if (containerFullPath != null)
      {
        while (true)
        {
          IPath path = containerFullPath.append(fileName);
          if (ResourcesPlugin.getWorkspace().getRoot().exists(path))
          {
            count++;
            fileName = defaultName + count + defaultFileExtension;
          }
          else
          {
            break;
          }
        }
      }
      return fileName;
    }

    // returns true if file of specified name exists in any case for selected container
    protected String existsFileAnyCase(String fileName)
    {
      if ( (getContainerFullPath() != null) && (getContainerFullPath().isEmpty() == false)
            && (fileName.compareTo("") != 0))
      {
        //look through all resources at the specified container - compare in upper case
        IResource parent = ResourcesPlugin.getWorkspace().getRoot().findMember(getContainerFullPath());
        if (parent instanceof IContainer)
        {
          IContainer container = (IContainer) parent;
          try
          {
            IResource[] members = container.members();
            String enteredFileUpper = fileName.toUpperCase();
            for (int i=0; i<members.length; i++)
            {
              String resourceUpperName = members[i].getName().toUpperCase();
              if (resourceUpperName.equals(enteredFileUpper))
              {  
                return members[i].getName();    
              }
            }
          }
          catch (CoreException e)
          {
          }
        }
      }
      return null;
    }


    protected boolean validatePage()
    {     
      String fullFileName = getFileName();
      String fileExtension = (new Path(fullFileName)).getFileExtension();
      if (fileExtension != null) 
      {                    
        IEditorRegistry editorRegistry = PlatformUI.getWorkbench().getEditorRegistry();
        IEditorDescriptor defaultEditorDescriptor = editorRegistry.getDefaultEditor();   
        IEditorDescriptor[] descriptors =  editorRegistry.getEditors(getFileName());        
        if (descriptors.length == 0)
        {                                                                         
          setErrorMessage(XMLWizard.getString("_ERROR_BAD_FILENAME_EXTENSION"));                                                    
          return false;
        }              
      }
      else
      {
        // no fileExtension, let's check for this file with an .xml extension
        fullFileName += ".xml";
        if ( (getContainerFullPath() != null) && (getContainerFullPath().isEmpty() == false)
           && (getFileName().compareTo("") != 0))
        {
          Path fullPath = new Path(getContainerFullPath().toString() + '/' + fullFileName);
          IResource resource = ResourcesPlugin.getWorkspace().getRoot().findMember(fullPath);
          if (resource != null) 
          {
            setErrorMessage(XMLWizard.getString("_ERROR_FILE_ALREADY_EXISTS"));
            return false;    
          }
        }        
      }

      // check for file should be case insensitive
      String sameName = existsFileAnyCase(fullFileName);
      if (sameName != null) 
      {
         String qualifiedFileName = getContainerFullPath().toString() + '/' + fullFileName;
         setErrorMessage(XMLWizard.getString("_ERROR_FILE_ALREADY_EXISTS") + " " +  sameName);
         return false;
      }
            
      return super.validatePage();
    }

    public void createControl(Composite parent)
    {
      // inherit default container and name specification widgets
      super.createControl(parent);
      this.setFileName(computeDefaultFileName());
      setPageComplete(validatePage());
    }
  }
}