/*******************************************************************************
 * Copyright (c) 2005, 2006 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.xsd.ui.internal.search.actions;

import org.eclipse.core.resources.IFile;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.search.ui.NewSearchUI;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IFileEditorInput;
import org.eclipse.wst.common.core.search.pattern.QualifiedName;
import org.eclipse.wst.common.core.search.scope.SearchScope;
import org.eclipse.wst.common.core.search.scope.WorkspaceSearchScope;
import org.eclipse.wst.xsd.ui.internal.search.IXSDSearchConstants;
import org.eclipse.wst.xsd.ui.internal.search.XSDSearchQuery;
import org.eclipse.xsd.XSDComplexTypeDefinition;
import org.eclipse.xsd.XSDElementDeclaration;
import org.eclipse.xsd.XSDNamedComponent;
import org.eclipse.xsd.XSDSimpleTypeDefinition;

public class FindReferencesAction extends FindAction{
	public FindReferencesAction(IEditorPart editor)
	{   
		super(editor);
	}
	
	public void setActionDefinitionId(String string)
	{
		
	}
	
	/**
	 * To be used by subclass in its run()
	 * Returns the file where the selection of a component (from the user) occurs
	 * ie. Returns the file that the user is currently working on.
	 * @return The IFile representation of the current working file.
	 */
	protected IFile getCurrentFile(){
		if (editor != null){
			IEditorInput input = editor.getEditorInput();
			if (input instanceof IFileEditorInput){
				IFileEditorInput fileEditorInput = (IFileEditorInput)input;               
				return  fileEditorInput.getFile();
			}
		}
		return null;
	}
	
	/**
	 * To be used by subclass in its run()
	 * Works with the Editor to return the selected XSD component which the user
	 * wants to do the search on.
	 * @return
	 * 	The XSDNamedComponent that the user points to (using cursor).
	 */
	protected XSDNamedComponent getXSDNamedComponent(){
		if (editor != null){     
			ISelectionProvider provider = 
				(ISelectionProvider) editor.getAdapter(ISelectionProvider.class);
			if (provider != null)
			{
				ISelection selection = provider.getSelection();
				if (selection != null && selection instanceof IStructuredSelection)
				{
					IStructuredSelection s = (IStructuredSelection) selection;
					Object o = s.getFirstElement();
					if (o != null && o instanceof XSDNamedComponent)
					{
						return (XSDNamedComponent) o;
					}
				}
			}			
		}
		 //The expected component we get from the editor does not meet
		 //  our expectation 
		return null;
	}
	
	/**
	 * To be used by subclass in its run()..
	 * Determines the metaName of the XSD component given to this method.
	 * @param component The component of which we want to determine the name
	 * @return
	 */
	protected QualifiedName determineMetaName(XSDNamedComponent component){
		QualifiedName metaName = null;
		if (component instanceof XSDComplexTypeDefinition)
		{             
			metaName = IXSDSearchConstants.COMPLEX_TYPE_META_NAME;
		}
		else if (component instanceof XSDSimpleTypeDefinition)
		{
			metaName = IXSDSearchConstants.SIMPLE_TYPE_META_NAME;
		}  
		else if (component instanceof XSDElementDeclaration)
		{
			metaName = IXSDSearchConstants.ELEMENT_META_NAME; 
		} 
		return metaName;
	}
	
	public void run()
	{
		String pattern = "";
		
		XSDNamedComponent component = getXSDNamedComponent();
		IFile file = getCurrentFile();
		if ( file != null && component != null){
			QualifiedName metaName = determineMetaName(component);
			
			QualifiedName elementQName = 
				new QualifiedName(component.getTargetNamespace(), component.getName());
			
			SearchScope scope = new WorkspaceSearchScope();
			String scopeDescription = "Workspace";    
			XSDSearchQuery searchQuery = 
				new XSDSearchQuery(pattern, file, elementQName, metaName, XSDSearchQuery.LIMIT_TO_REFERENCES, scope, scopeDescription);    
			NewSearchUI.activateSearchResultView();
			NewSearchUI.runQueryInBackground(searchQuery);
		}
	}
}