/*******************************************************************************
 * Copyright (c) 2000, 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.jdt.internal.junit.ui;

import java.lang.reflect.InvocationTargetException;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;

import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Shell;

import org.eclipse.jface.dialogs.ErrorDialog;
import org.eclipse.jface.operation.IRunnableContext;
import org.eclipse.jface.operation.IRunnableWithProgress;

import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.contentassist.IContextInformation;

import org.eclipse.jdt.core.IClasspathEntry;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.JavaModelException;

import org.eclipse.jdt.ui.ISharedImages;
import org.eclipse.jdt.ui.JavaUI;
import org.eclipse.jdt.ui.text.java.IInvocationContext;
import org.eclipse.jdt.ui.text.java.IJavaCompletionProposal;

import org.eclipse.jdt.internal.ui.util.BusyIndicatorRunnableContext;

import org.eclipse.jdt.internal.junit.buildpath.BuildPathSupport;

public final class JUnitAddLibraryProposal implements IJavaCompletionProposal {
	
	private final IInvocationContext fContext;
	private final boolean fIsJunit4;
	private final int fRelevance;
	
	public JUnitAddLibraryProposal(boolean isJunit4, IInvocationContext context, int relevance) {
		fIsJunit4= isJunit4;
		fContext= context;
		fRelevance= relevance;
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.jdt.ui.text.java.IJavaCompletionProposal#getRelevance()
	 */
	public int getRelevance() {
		return fRelevance;
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.jface.text.contentassist.ICompletionProposal#apply(org.eclipse.jface.text.IDocument)
	 */
	public void apply(IDocument document) {   
		IJavaProject project= fContext.getCompilationUnit().getJavaProject();
		Shell shell= JUnitPlugin.getActiveWorkbenchShell();
		try {
			IClasspathEntry entry= null;
			if (fIsJunit4) {
				entry= BuildPathSupport.getJUnit4ClasspathEntry();
			} else {
				entry= BuildPathSupport.getJUnit3ClasspathEntry();
			}
			if (entry != null) {
				addToClasspath(shell, project, entry, new BusyIndicatorRunnableContext());
			}
			// force a reconcile
			int offset= fContext.getSelectionOffset();
			int length= fContext.getSelectionLength();
			String s= document.get(offset, length);
			document.replace(offset, length, s);
		} catch (CoreException e) {
			ErrorDialog.openError(shell, JUnitMessages.JUnitAddLibraryProposal_title, JUnitMessages.JUnitAddLibraryProposal_cannotAdd, e.getStatus());  
		} catch (BadLocationException e) {
			//ignore
		}
	}
	
	private static boolean addToClasspath(Shell shell, final IJavaProject project, IClasspathEntry entry, IRunnableContext context) throws JavaModelException {
		IClasspathEntry[] oldEntries= project.getRawClasspath();
		for (int i= 0; i < oldEntries.length; i++) {
			if (oldEntries[i].equals(entry)) {
				return true;
			}
		}
		int nEntries= oldEntries.length;
		final IClasspathEntry[] newEntries= new IClasspathEntry[nEntries + 1];
		System.arraycopy(oldEntries, 0, newEntries, 0, nEntries);
		newEntries[nEntries]= entry;
		// fix for 64974 OCE in New JUnit Test Case wizard while workspace is locked [JUnit] 
		try {
			context.run(true, false, new IRunnableWithProgress() {
				public void run(IProgressMonitor monitor) throws InvocationTargetException, InterruptedException {
					try {
						project.setRawClasspath(newEntries, monitor);
					} catch (JavaModelException e) {
						throw new InvocationTargetException(e);
					}
				}
			});
			return true;
		} catch (InvocationTargetException e) {
			Throwable t = e.getTargetException();
			if (t instanceof CoreException) {	
				ErrorDialog.openError(shell, JUnitMessages.JUnitAddLibraryProposal_title, JUnitMessages.JUnitAddLibraryProposal_cannotAdd, ((CoreException)t).getStatus());  
			}
			return false;
		} catch (InterruptedException e) {
			return false;
		}

	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.jface.text.contentassist.ICompletionProposal#getSelection(org.eclipse.jface.text.IDocument)
	 */
	public Point getSelection(IDocument document) {
		return new Point(fContext.getSelectionOffset(), fContext.getSelectionLength());
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.jface.text.contentassist.ICompletionProposal#getAdditionalProposalInfo()
	 */
	public String getAdditionalProposalInfo() {
		if (fIsJunit4) {
			return JUnitMessages.JUnitAddLibraryProposal_junit4_info; 
		}
		return JUnitMessages.JUnitAddLibraryProposal_info; 
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.jface.text.contentassist.ICompletionProposal#getDisplayString()
	 */
	public String getDisplayString() {
		if (fIsJunit4) {
			return JUnitMessages.JUnitAddLibraryProposa_junit4_label; 
		}
		return JUnitMessages.JUnitAddLibraryProposal_label; 
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.jface.text.contentassist.ICompletionProposal#getImage()
	 */
	public Image getImage() {
		return JavaUI.getSharedImages().getImage(ISharedImages.IMG_OBJS_LIBRARY);
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.jface.text.contentassist.ICompletionProposal#getContextInformation()
	 */
	public IContextInformation getContextInformation() {
		return null;
	}
}