package net.sourceforge.phpeclipse.phpeditor;

/**********************************************************************
Copyright (c) 2000, 2002 IBM Corp. and others.
All rights reserved. This program and the accompanying materials
are made available under the terms of the Common Public License v1.0
which accompanies this distribution, and is available at
http://www.eclipse.org/legal/cpl-v10.html

Contributors:
    IBM Corporation - Initial implementation
    Klaus Hartlage - www.eclipseproject.de
**********************************************************************/

import net.sourceforge.phpeclipse.PHPeclipsePlugin;
import net.sourceforge.phpeclipse.actions.PHPEclipseShowAction;

import org.eclipse.core.resources.IFile;
import org.eclipse.swt.SWT;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IFileEditorInput;
import org.eclipse.ui.IViewPart;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.texteditor.ITextEditor;
import org.eclipse.ui.texteditor.TextEditorAction;
import org.eclipse.update.internal.ui.UpdatePerspective;
import org.eclipse.update.internal.ui.UpdateUIPlugin;
import org.eclipse.update.internal.ui.views.IEmbeddedWebBrowser;

/**
 * ClassDeclaration that defines the action for parsing the current PHP file
 */
public class ShowExternalPreviewAction extends TextEditorAction {

  private static ShowExternalPreviewAction instance = new ShowExternalPreviewAction();

  protected IFile fileToParse;

  /**
   * Constructs and updates the action.
   */
  private ShowExternalPreviewAction() {
    super(PHPEditorMessages.getResourceBundle(), "ParserAction.", null); //$NON-NLS-1$
    update();
  }

  public static ShowExternalPreviewAction getInstance() {
    return instance;
  }

  /**
   * Code called when the action is fired.
   */
  public void run() {
    fileToParse = getFile();
    if (fileToParse == null) {
      // should never happen
      return;
    }

    if (SWT.getPlatform().equals("win32")) {
      String localhostURL;
      if ((localhostURL = PHPEclipseShowAction.getLocalhostURL(null, fileToParse)) == null) {
        return;
      }
      IWorkbenchPage page = PHPeclipsePlugin.getActivePage();
      try {
        IViewPart part = page.findView(UpdatePerspective.ID_BROWSER);
        if (part == null) {
          part = page.showView(UpdatePerspective.ID_BROWSER);
        } else
          page.bringToTop(part);
        ((IEmbeddedWebBrowser) part).openTo(localhostURL);
      } catch (PartInitException e) {
        UpdateUIPlugin.logException(e);
      }
    }

  }

  /**
   * Finds the file that's currently opened in the PHP Text Editor
   */
  protected IFile getFile() {
    ITextEditor editor = getTextEditor();

    IEditorInput editorInput = null;
    if (editor != null) {
      editorInput = editor.getEditorInput();
    }

    if (editorInput instanceof IFileEditorInput)
      return ((IFileEditorInput) editorInput).getFile();

    // if nothing was found, which should never happen
    return null;
  }

}