/*******************************************************************************
 * 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.jst.jsp.ui.internal.java.search;

import org.eclipse.core.resources.IFile;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.ITextSelection;
import org.eclipse.jst.jsp.core.internal.java.IJSPTranslation;
import org.eclipse.jst.jsp.core.internal.java.JSPTranslation;
import org.eclipse.jst.jsp.core.internal.java.JSPTranslationAdapter;
import org.eclipse.jst.jsp.core.internal.regions.DOMJSPRegionContexts;
import org.eclipse.jst.jsp.core.text.IJSPPartitions;
import org.eclipse.search.ui.ISearchQuery;
import org.eclipse.search.ui.NewSearchUI;
import org.eclipse.wst.sse.core.StructuredModelManager;
import org.eclipse.wst.sse.core.internal.provisional.IStructuredModel;
import org.eclipse.wst.sse.core.internal.provisional.text.IStructuredDocument;
import org.eclipse.wst.sse.core.internal.provisional.text.IStructuredDocumentRegion;
import org.eclipse.wst.sse.core.internal.provisional.text.ITextRegion;
import org.eclipse.wst.sse.ui.internal.search.FindOccurrencesProcessor;
import org.eclipse.wst.xml.core.internal.provisional.document.IDOMDocument;
import org.eclipse.wst.xml.core.internal.provisional.document.IDOMModel;
import org.eclipse.wst.xml.core.internal.regions.DOMRegionContext;

/**
 * Configures a FindOccurrencesProcessor with JSP partitions and regions
 */
public class JSPFindOccurrencesProcessor extends FindOccurrencesProcessor {

	public boolean findOccurrences(IDocument document, ITextSelection textSelection, IFile file) {
		boolean findOccurrences = false;

		// determine if action should be enabled or not
		if (document instanceof IStructuredDocument) {
			IStructuredDocument structuredDocument = (IStructuredDocument) document;
			IStructuredDocumentRegion sdRegion = structuredDocument.getRegionAtCharacterOffset(textSelection.getOffset());
			if (sdRegion != null) {
				ITextRegion r = sdRegion.getRegionAtCharacterOffset(textSelection.getOffset());
				if (r != null) {
					String type = r.getType();
					if (enabledForRegionType(type)) {
						String matchText = sdRegion.getText(r);

						if (matchText != null && type != null) {
							JSPSearchQuery searchQuery = (JSPSearchQuery) getSearchQuery(file, structuredDocument, matchText, type, textSelection);
							findOccurrences = true;
							if (searchQuery != null) {
								if(searchQuery.getSearchText() == null || searchQuery.getSearchText().length() == 0)
									findOccurrences = false;
								else
								{
									// first of all activate the view
									NewSearchUI.activateSearchResultView();
									
									if (searchQuery.canRunInBackground())
										NewSearchUI.runQueryInBackground(searchQuery);
									else
										NewSearchUI.runQueryInForeground(null, searchQuery);
								}
							}
						}
					}
				}
			}
		}
		return findOccurrences;
	}
	
	protected String[] getPartitionTypes() {
		return new String[]{IJSPPartitions.JSP_DEFAULT, IJSPPartitions.JSP_CONTENT_JAVA};
	}

	protected String[] getRegionTypes() {
		return new String[]{DOMRegionContext.BLOCK_TEXT, DOMJSPRegionContexts.JSP_CONTENT};
	}

	protected ISearchQuery getSearchQuery(IFile file, IStructuredDocument document, String regionText, String regionType, ITextSelection textSelection) {
		return new JSPSearchQuery(file, getJavaElement(document, textSelection));
	}

	private IJavaElement getJavaElement(IDocument document, ITextSelection textSelection) {
		IJavaElement[] elements = getJavaElementsForCurrentSelection(document, textSelection);
		return elements.length > 0 ? elements[0] : null;
	}

	/**
	 * uses JSPTranslation to get currently selected Java elements.
	 * 
	 * @return currently selected IJavaElements
	 */
	private IJavaElement[] getJavaElementsForCurrentSelection(IDocument document, ITextSelection selection) {
		IJavaElement[] elements = new IJavaElement[0];
		// get JSP translation object for this viewer's document
		IStructuredModel model = StructuredModelManager.getModelManager().getExistingModelForRead(document);
		try {
			if (model != null && model instanceof IDOMModel) {
				IDOMDocument xmlDoc = ((IDOMModel) model).getDocument();
				JSPTranslationAdapter adapter = (JSPTranslationAdapter) xmlDoc.getAdapterFor(IJSPTranslation.class);
				if (adapter != null) {
					JSPTranslation translation = adapter.getJSPTranslation();

					// https://bugs.eclipse.org/bugs/show_bug.cgi?id=102211
					elements = translation.getElementsFromJspRange(selection.getOffset(), selection.getOffset() + selection.getLength());
				}
			}
		}
		finally {
			if (model != null)
				model.releaseFromRead();
		}
		return elements;
	}
}