/*******************************************************************************
 * 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
 *     Sebastian Davids <sdavids@gmx.de> - bug 48696
 *******************************************************************************/
package org.eclipse.jdt.internal.junit.ui;

import java.util.ArrayList;
import java.util.HashSet;

import org.eclipse.text.edits.MalformedTreeException;
import org.eclipse.text.edits.TextEdit;

import org.eclipse.core.runtime.CoreException;

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

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

import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.core.compiler.IProblem;
import org.eclipse.jdt.core.dom.ASTNode;
import org.eclipse.jdt.core.dom.BodyDeclaration;
import org.eclipse.jdt.core.dom.CompilationUnit;
import org.eclipse.jdt.core.dom.IAnnotationBinding;
import org.eclipse.jdt.core.dom.IMethodBinding;
import org.eclipse.jdt.core.dom.ITypeBinding;
import org.eclipse.jdt.core.dom.MethodDeclaration;
import org.eclipse.jdt.core.dom.rewrite.ImportRewrite;

import org.eclipse.jdt.ui.CodeStyleConfiguration;
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.ui.text.java.IProblemLocation;
import org.eclipse.jdt.ui.text.java.IQuickFixProcessor;

import org.eclipse.jdt.internal.junit.Messages;
import org.eclipse.jdt.internal.junit.util.JUnitStubUtility;

public class JUnitQuickFixProcessor implements IQuickFixProcessor {
	
	private static final int JUNIT3= 1;
	private static final int JUNIT4= 2;
	
	private static final HashSet ASSERT_METHOD_NAMES= new HashSet();
	
	public JUnitQuickFixProcessor() {
		ASSERT_METHOD_NAMES.add("fail"); //$NON-NLS-1$
		ASSERT_METHOD_NAMES.add("assertTrue"); //$NON-NLS-1$
		ASSERT_METHOD_NAMES.add("assertFalse"); //$NON-NLS-1$
		ASSERT_METHOD_NAMES.add("assertEquals"); //$NON-NLS-1$
		ASSERT_METHOD_NAMES.add("assertNotNull"); //$NON-NLS-1$
		ASSERT_METHOD_NAMES.add("assertNull"); //$NON-NLS-1$
		ASSERT_METHOD_NAMES.add("assertSame"); //$NON-NLS-1$
		ASSERT_METHOD_NAMES.add("assertNotSame"); //$NON-NLS-1$
		ASSERT_METHOD_NAMES.add("failNotEquals"); //$NON-NLS-1$
		ASSERT_METHOD_NAMES.add("failSame"); //$NON-NLS-1$
		ASSERT_METHOD_NAMES.add("failNotSame"); //$NON-NLS-1$
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jdt.ui.text.java.IQuickFixProcessor#hasCorrections(org.eclipse.jdt.core.ICompilationUnit, int)
	 */
	public boolean hasCorrections(ICompilationUnit unit, int problemId) {
		return problemId == IProblem.UndefinedType || problemId ==  IProblem.ImportNotFound
		|| problemId ==  IProblem.UndefinedMethod;
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.jdt.ui.text.java.IQuickFixProcessor#getCorrections(org.eclipse.jdt.ui.text.java.IInvocationContext, org.eclipse.jdt.ui.text.java.IProblemLocation[])
	 */
	public IJavaCompletionProposal[] getCorrections(final IInvocationContext context, IProblemLocation[] locations)  {
		ArrayList res= null;
		for (int i= 0; i < locations.length; i++) {
			IProblemLocation problem= locations[i];
			int id= problem.getProblemId();
			if (IProblem.UndefinedType == id || IProblem.ImportNotFound == id) {
				res= getAddJUnitToBuildPathProposals(context, problem, res);
			} else if (id == IProblem.UndefinedMethod) {
				res= getAddAssertImportProposals(context, problem, res);
			}
		}
		if (res == null || res.isEmpty()) {
			return null;
		}
		return (IJavaCompletionProposal[]) res.toArray(new IJavaCompletionProposal[res.size()]);
	}
		
	private ArrayList getAddAssertImportProposals(IInvocationContext context, IProblemLocation problem, ArrayList proposals) {
		String[] args= problem.getProblemArguments();
		if (args.length > 1) {
			String methodName= args[1];
			if (ASSERT_METHOD_NAMES.contains(methodName) && isInsideJUnit4Test(context)) {
				if (proposals == null) {
					proposals= new ArrayList();
				}
				proposals.add(new AddAssertProposal(context.getASTRoot(), methodName, 9));
				proposals.add(new AddAssertProposal(context.getASTRoot(), "*", 10)); //$NON-NLS-1$
			}
		}
		return proposals;
	}

	private ArrayList getAddJUnitToBuildPathProposals(IInvocationContext context, IProblemLocation location, ArrayList proposals) {
		try {
			ICompilationUnit unit= context.getCompilationUnit();
			int res= 0;
			String s= unit.getBuffer().getText(location.getOffset(), location.getLength());
			if (s.equals("org.junit")) { //$NON-NLS-1$
				res= JUNIT4;
			} else if (s.equals("TestCase") || s.equals("TestSuite") || s.equals("junit")) { //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
				res= JUNIT3;
			} else if (s.equals("Test")) { //$NON-NLS-1$
				res= JUNIT3 | JUNIT4;
			}
			if (res != 0) {
				IJavaProject javaProject= unit.getJavaProject();
				if (JUnitStubUtility.is50OrHigher(javaProject) && ((res & JUNIT4) != 0)) {
					if (proposals == null) {
						proposals= new ArrayList();
					}
					proposals.add(new JUnitAddLibraryProposal(true, context, 10));
				}
				if ((res & JUNIT3) != 0) {
					if (proposals == null) {
						proposals= new ArrayList();
					}
					proposals.add(new JUnitAddLibraryProposal(false, context, 8));
				}
			}
		} catch (JavaModelException e) {
		    JUnitPlugin.log(e.getStatus());
		}
		return proposals;
	}

	private boolean isInsideJUnit4Test(IInvocationContext context) {
		if (!JUnitStubUtility.is50OrHigher(context.getCompilationUnit().getJavaProject())) {
			return false;
		}
		
		ASTNode node= context.getCoveringNode();
		while (node != null && !(node instanceof BodyDeclaration)) {
			node= node.getParent();
		}
		if (node instanceof MethodDeclaration) {
			IMethodBinding binding= ((MethodDeclaration) node).resolveBinding();
			if (binding != null) {
				IAnnotationBinding[] annotations= binding.getAnnotations();
				for (int i= 0; i < annotations.length; i++) {
					final ITypeBinding annotationType= annotations[i].getAnnotationType();
					if (annotationType != null && JUnitPlugin.JUNIT4_ANNOTATION_NAME.equals(annotationType.getQualifiedName()))
						return true;
				}
			}
		}
		return false;
	}
	
	private static class AddAssertProposal implements IJavaCompletionProposal {
		
		private final CompilationUnit fAstRoot;
		private final String fMethodName;
		private final int fRelevance;

		public AddAssertProposal(CompilationUnit astRoot, String methodName, int relevance) {
			fAstRoot= astRoot;
			fMethodName= methodName;
			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) {
			try {
				ImportRewrite rewrite= CodeStyleConfiguration.createImportRewrite(fAstRoot, true);
				rewrite.addStaticImport("org.junit.Assert", fMethodName, true); //$NON-NLS-1$
				TextEdit edit= rewrite.rewriteImports(null);
				edit.apply(document);
			} catch (MalformedTreeException e) {
			} catch (CoreException e) {
			} catch (BadLocationException e) {
			}
		}

		/* (non-Javadoc)
		 * @see org.eclipse.jface.text.contentassist.ICompletionProposal#getAdditionalProposalInfo()
		 */
		public String getAdditionalProposalInfo() {
			return Messages.format(JUnitMessages.JUnitQuickFixProcessor_add_assert_info, fMethodName);
		}

		/* (non-Javadoc)
		 * @see org.eclipse.jface.text.contentassist.ICompletionProposal#getContextInformation()
		 */
		public IContextInformation getContextInformation() {
			return null;
		}

		/* (non-Javadoc)
		 * @see org.eclipse.jface.text.contentassist.ICompletionProposal#getDisplayString()
		 */
		public String getDisplayString() {
			return Messages.format(JUnitMessages.JUnitQuickFixProcessor_add_assert_description, fMethodName);
		}

		/* (non-Javadoc)
		 * @see org.eclipse.jface.text.contentassist.ICompletionProposal#getImage()
		 */
		public Image getImage() {
			return JavaUI.getSharedImages().getImage(ISharedImages.IMG_OBJS_IMPDECL);
		}

		/* (non-Javadoc)
		 * @see org.eclipse.jface.text.contentassist.ICompletionProposal#getSelection(org.eclipse.jface.text.IDocument)
		 */
		public Point getSelection(IDocument document) {
			return null;
		}
	}
	
}