/***********************************************************************************************************************************
 * Copyright (c) 2000, 2004 IBM Corporation 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 API and implementation
 **********************************************************************************************************************************/
package net.sourceforge.phpeclipse.wiki.editor;

import java.net.MalformedURLException;
import java.net.URL;

import net.sourceforge.phpeclipse.wiki.editor.model.WikipediaText;
import net.sourceforge.phpeclipse.wiki.editor.model.WikipediaSection;

import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Composite;

import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.viewers.AbstractTreeViewer;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.Viewer;

import org.eclipse.ui.views.contentoutline.ContentOutlinePage;

public class WikiOutlinePage extends ContentOutlinePage {

  private WikiEditor fEditor;

  private static class WikiContentProvider implements ITreeContentProvider {

    public Object[] getChildren(Object parentElement) {
      return ((WikipediaSection) parentElement).getChildren();
    }

    public Object getParent(Object element) {
      return ((WikipediaSection) element).getParent();
    }

    public boolean hasChildren(Object element) {
      Object[] children = getChildren(element);
      return children != null && children.length != 0;
    }

    public Object[] getElements(Object inputElement) {
      return getChildren(inputElement);
    }

    public void dispose() {
      // do nothing
    }

    public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
      // do nothing
    }
  }

  private static class WikiLabelProvider extends LabelProvider {
    private static URL fgIconBaseURL = WikiEditorPlugin.getDefault().getBundle().getEntry("/icons/");

    private final Image fIngredientsSectionIcon = createImage("ingredients.gif");

    private final Image fIngredientIcon = createImage("ingredient.gif");

    private final Image fPreparationSectionIcon = createImage("preparation.gif");

    private final Image fStepIcon = createImage("step.gif");

    public static Image createImage(String icon) {
      try {
        ImageDescriptor id = ImageDescriptor.createFromURL(new URL(fgIconBaseURL, icon));
        return id.createImage();
      } catch (MalformedURLException e) {
        // no icon ...
      }
      return null;
    }

    public String getText(Object element) {
      return ((WikipediaSection) element).getName();
    }

    public Image getImage(Object element) {
      if (element instanceof WikipediaSection)
        return fStepIcon;
      return super.getImage(element);
    }

    public void dispose() {
      super.dispose();
      if (fIngredientsSectionIcon != null)
        fIngredientsSectionIcon.dispose();
      if (fIngredientIcon != null)
        fIngredientIcon.dispose();
      if (fPreparationSectionIcon != null)
        fPreparationSectionIcon.dispose();
      if (fStepIcon != null)
        fStepIcon.dispose();
    }
  }

  public WikiOutlinePage(WikiEditor editor) {
    fEditor = editor;
  }

  public void createControl(Composite parent) {
    super.createControl(parent);
    TreeViewer treeViewer = getTreeViewer();
    treeViewer.setLabelProvider(new WikiLabelProvider());
    treeViewer.setContentProvider(new WikiContentProvider());
    treeViewer.setAutoExpandLevel(AbstractTreeViewer.ALL_LEVELS);
    treeViewer.addSelectionChangedListener(new ISelectionChangedListener() {
      public void selectionChanged(SelectionChangedEvent event) {
        if (!(event.getSelection() instanceof IStructuredSelection))
          return;
        IStructuredSelection selection = (IStructuredSelection) event.getSelection();
        if (selection.size() != 1)
          return;
        Object element = selection.getFirstElement();
        if (!(element instanceof WikipediaSection))
          return;
        WikipediaSection recipeElement = (WikipediaSection) element;
        fEditor.selectAndReveal(recipeElement.getOffset(), recipeElement.getLength());
      }
    });
    setWiki(fEditor.getSection());
  }

  public void setWiki(WikipediaSection section) {
    getTreeViewer().setInput(section);
  }

  public void dispose() {
    super.dispose();
    fEditor.outlinePageClosed();
    fEditor = null;
  }
}