/**********************************************************************
 * This file is part of "Object Teams Development Tooling"-Software
 * 
 * Copyright 2004, 2010 Fraunhofer Gesellschaft, Munich, Germany,
 * for its Fraunhofer Institute and Computer Architecture and Software
 * Technology (FIRST), Berlin, Germany and Technical University Berlin,
 * Germany.
 * 
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 * $Id$
 * 
 * Please visit http://www.eclipse.org/objectteams for updates and contact.
 * 
 * Contributors:
 * 	  Fraunhofer FIRST - Initial API and implementation
 * 	  Technical University Berlin - Initial API and implementation
 **********************************************************************/
package org.eclipse.objectteams.otdt.ui.tests.refactoring.extractmethod;

/**
 * @author brcan
 *
 */
import java.io.IOException;
import java.io.InputStream;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.IPackageFragment;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.ui.tests.refactoring.infra.AbstractCUTestCase;
import org.eclipse.jface.text.ITextSelection;
import org.eclipse.jface.text.TextSelection;
import org.eclipse.ltk.core.refactoring.Change;
import org.eclipse.ltk.core.refactoring.CheckConditionsOperation;
import org.eclipse.ltk.core.refactoring.IUndoManager;
import org.eclipse.ltk.core.refactoring.PerformRefactoringOperation;
import org.eclipse.ltk.core.refactoring.Refactoring;
import org.eclipse.ltk.core.refactoring.RefactoringCore;
import org.eclipse.ltk.core.refactoring.RefactoringStatus;
import org.eclipse.objectteams.otdt.ui.tests.refactoring.OTRefactoringTestPlugin;

@SuppressWarnings({ "nls", "restriction" })
public abstract class AbstractSelectionTestCase extends AbstractCUTestCase
{
	public static final String SQUARE_BRACKET_OPEN = "/*[*/";
	public static final int    SQUARE_BRACKET_OPEN_LENGTH = SQUARE_BRACKET_OPEN.length();
	public static final String SQUARE_BRACKET_CLOSE =   "/*]*/";
	public static final int    SQUARE_BRACKET_CLOSE_LENGTH = SQUARE_BRACKET_CLOSE.length();
	
	protected static final int VALID_SELECTION     = 1;
	protected static final int INVALID_SELECTION   = 2;
	protected static final int COMPARE_WITH_OUTPUT = 3;
	
	public AbstractSelectionTestCase(String name)
	{
		super(name);
	}

	protected int[] getSelection(String source)
	{
		int start = -1;
		int end = -1;
		int includingStart = source.indexOf(SQUARE_BRACKET_OPEN);
		int excludingStart = source.indexOf(SQUARE_BRACKET_CLOSE);
		int includingEnd = source.lastIndexOf(SQUARE_BRACKET_CLOSE);
		int excludingEnd = source.lastIndexOf(SQUARE_BRACKET_OPEN);

		if (includingStart > excludingStart && excludingStart != -1)
		{
			includingStart = -1;
		}
		else if (excludingStart > includingStart && includingStart != -1)
		{
			excludingStart = -1;
		}
		
		if (includingEnd < excludingEnd)
		{
			includingEnd = -1;
		}
		else if (excludingEnd < includingEnd)
		{
			excludingEnd = -1;
		}
		
		if (includingStart != -1)
		{
			start = includingStart;
		}
		else
		{
			start = excludingStart + SQUARE_BRACKET_CLOSE_LENGTH;
		}
		
		if (excludingEnd != -1)
		{
			end = excludingEnd;
		}
		else
		{
			end = includingEnd + SQUARE_BRACKET_CLOSE_LENGTH;
		}
		
		assertTrue("Selection invalid", start >= 0 && end >= 0 && end >= start);
		
		int[] result = new int[] { start, end - start }; 
		// System.out.println("|"+ source.substring(result[0], result[0] + result[1]) + "|");
		return result;
	}
	
	protected ITextSelection getTextSelection(String source)
	{
		int[] s = getSelection(source);
		return new TextSelection(s[0], s[1]);
	}
	
	protected InputStream getFileInputStream(String fileName) throws IOException
	{
		return OTRefactoringTestPlugin.getDefault().getTestResourceStream(fileName);
	}
	
//{ObjectTeams: fixing a JDT-problem: couldn't cope with package paths > 1	
	protected ICompilationUnit createCU(IPackageFragment pack, String name) throws Exception {
		name= adaptName(name);
		return createCU(pack, name, getFileInputStream(myGetFilePath(pack, name)));
	}
	
	protected String myGetFilePath(String path, String name) {
		return getResourceLocation() + path + "/" + name;
	}
	
	protected String myGetFilePath(IPackageFragment pack, String name) {
		return myGetFilePath(pack.getElementName().replace('.','/'), name); // <-- the patch: force the package path to use '/'		
	}
// SH}

	protected void performTest(
	        final ICompilationUnit unit,
	        final Refactoring refactoring,
	        int mode,
	        final String out,
	        boolean doUndo) throws Exception
    {
	    IProgressMonitor pm = new NullProgressMonitor();
		switch (mode)
		{
			case VALID_SELECTION:
				assertTrue(checkPreconditions(refactoring, pm).isOK());
				break;
			case INVALID_SELECTION:
				assertTrue(!checkPreconditions(refactoring, pm).isOK());
				break;
			case COMPARE_WITH_OUTPUT:
				IUndoManager undoManager = RefactoringCore.getUndoManager();
				undoManager.flush();
				String original = unit.getSource();
				
				PerformRefactoringOperation op = new PerformRefactoringOperation(
					refactoring, getCheckingStyle());
				JavaCore.run(op, new NullProgressMonitor());
				assertTrue("Precondition check failed", !op.getConditionStatus().hasFatalError());
				assertTrue("Validation check failed", !op.getValidationStatus().hasFatalError());
				assertNotNull("No Undo", op.getUndoChange());
				compareSource(unit.getSource(), out);
				Change undo = op.getUndoChange();
				assertNotNull("Undo doesn't exist", undo);
				assertTrue("Undo manager is empty", undoManager.anythingToUndo());

				if (doUndo)
				{
					undoManager.performUndo(null, new NullProgressMonitor());
					assertTrue("Undo manager still has undo", !undoManager.anythingToUndo());
					assertTrue("Undo manager is empty", undoManager.anythingToRedo());
					compareSource(original, unit.getSource());
				}
				break;		
		}
	}
	
	protected RefactoringStatus checkPreconditions(
	        Refactoring refactoring,
	        IProgressMonitor pm) throws CoreException
    {
		CheckConditionsOperation op =
		    new CheckConditionsOperation(refactoring, getCheckingStyle());
		op.run(new NullProgressMonitor());
		return op.getStatus();
	}
	
	protected int getCheckingStyle()
	{
		return CheckConditionsOperation.ALL_CONDITIONS;
	}
}