/* *******************************************************************
 * Copyright (c) 1999-2001 Xerox Corporation, 
 *               2002 Palo Alto Research Center, Incorporated (PARC).
 * 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: 
 *     PARC     initial implementation 
 * ******************************************************************/

package org.aspectj.ajdt.internal.core.builder;

import java.io.File;

import org.aspectj.bridge.IMessage;
import org.aspectj.bridge.IProgressListener;
import org.aspectj.bridge.ISourceLocation;
import org.aspectj.bridge.Message;
import org.aspectj.bridge.SourceLocation;
import org.aspectj.org.eclipse.jdt.core.compiler.IProblem;
import org.aspectj.org.eclipse.jdt.internal.compiler.env.ICompilationUnit;
import org.aspectj.weaver.LintMessage;
import org.aspectj.weaver.World;

public class EclipseAdapterUtils {

	// XXX some cut-and-paste from eclipse sources
	public static String makeLocationContext(ICompilationUnit compilationUnit, IProblem problem) {
		// extra from the source the innacurate token
		// and "highlight" it using some underneath ^^^^^
		// put some context around too.

		// this code assumes that the font used in the console is fixed size

		// sanity .....
		int startPosition = problem.getSourceStart();
		int endPosition = problem.getSourceEnd();

		if ((startPosition > endPosition) || ((startPosition <= 0) && (endPosition <= 0)) || compilationUnit == null)
			//return Util.bind("problem.noSourceInformation"); //$NON-NLS-1$
			return "(no source information available)";

		final char SPACE = '\u0020';
		final char MARK = '^';
		final char TAB = '\t';
		char[] source = compilationUnit.getContents();
		// the next code tries to underline the token.....
		// it assumes (for a good display) that token source does not
		// contain any \r \n. This is false on statements !
		// (the code still works but the display is not optimal !)

		// compute the how-much-char we are displaying around the inaccurate token
		int begin = startPosition >= source.length ? source.length - 1 : startPosition;
		if (begin == -1)
			return "(no source information available)"; // Dont like this - why does it occur? pr152835
		int relativeStart = 0;
		int end = endPosition >= source.length ? source.length - 1 : endPosition;
		int relativeEnd = 0;
		label: for (relativeStart = 0;; relativeStart++) {
			if (begin == 0)
				break label;
			if ((source[begin - 1] == '\n') || (source[begin - 1] == '\r'))
				break label;
			begin--;
		}
		label: for (relativeEnd = 0;; relativeEnd++) {
			if ((end + 1) >= source.length)
				break label;
			if ((source[end + 1] == '\r') || (source[end + 1] == '\n')) {
				break label;
			}
			end++;
		}
		// extract the message form the source
		char[] extract = new char[end - begin + 1];
		System.arraycopy(source, begin, extract, 0, extract.length);
		char c;
		// remove all SPACE and TAB that begin the error message...
		int trimLeftIndex = 0;
		while ((((c = extract[trimLeftIndex++]) == TAB) || (c == SPACE)) && trimLeftIndex < extract.length) {
		}
		if (trimLeftIndex >= extract.length)
			return new String(extract) + "\n";
		System.arraycopy(extract, trimLeftIndex - 1, extract = new char[extract.length - trimLeftIndex + 1], 0, extract.length);
		relativeStart -= trimLeftIndex;
		// buffer spaces and tabs in order to reach the error position
		int pos = 0;
		char[] underneath = new char[extract.length]; // can't be bigger
		for (int i = 0; i <= relativeStart; i++) {
			if (extract[i] == TAB) {
				underneath[pos++] = TAB;
			} else {
				underneath[pos++] = SPACE;
			}
		}
		// mark the error position
		for (int i = startPosition + trimLeftIndex; // AMC if we took stuff off the start, take it into account!
		i <= (endPosition >= source.length ? source.length - 1 : endPosition); i++)
			underneath[pos++] = MARK;
		// resize underneathto remove 'null' chars
		System.arraycopy(underneath, 0, underneath = new char[pos], 0, pos);

		return new String(extract) + "\n" + new String(underneath); //$NON-NLS-2$ //$NON-NLS-1$
	}

	/**
	 * Extract source location file, start and end lines, and context. Column is not extracted correctly.
	 * @param progressListener 
	 * 
	 * @return ISourceLocation with correct file and lines but not column.
	 */
	public static ISourceLocation makeSourceLocation(ICompilationUnit unit, IProblem problem, IProgressListener progressListener) {
		int line = problem.getSourceLineNumber();
		File file = new File(new String(problem.getOriginatingFileName()));
		// cheat here...269912 - don't build the context if under IDE control
		if (progressListener!=null) {
			return new SourceLocation(file, line, line, 0, null);
		} else {
			String context = makeLocationContext(unit, problem);
			// XXX 0 column is wrong but recoverable from makeLocationContext
			return new SourceLocation(file, line, line, 0, context);
		}
	}

	/**
	 * Extract message text and source location, including context.
	 * 
	 * @param world
	 * @param progressListener 
	 */
	public static IMessage makeMessage(ICompilationUnit unit, IProblem problem, World world, IProgressListener progressListener) {
		ISourceLocation sourceLocation = makeSourceLocation(unit, problem, progressListener);
		IProblem[] seeAlso = problem.seeAlso();
		// If the user has turned off classfile line number gen, then we may not be able to tell them
		// about all secondary locations (pr209372)
		int validPlaces = 0;
		for (int ii = 0; ii < seeAlso.length; ii++) {
			if (seeAlso[ii].getSourceLineNumber() >= 0)
				validPlaces++;
		}
		ISourceLocation[] seeAlsoLocations = new ISourceLocation[validPlaces];
		int pos = 0;
		for (int i = 0; i < seeAlso.length; i++) {
			if (seeAlso[i].getSourceLineNumber() >= 0) {
				seeAlsoLocations[pos++] = new SourceLocation(new File(new String(seeAlso[i].getOriginatingFileName())), seeAlso[i]
						.getSourceLineNumber());
			}
		}
		// We transform messages from AJ types to eclipse IProblems
		// and back to AJ types. During their time as eclipse problems,
		// we remember whether the message originated from a declare
		// in the extraDetails.
		String extraDetails = problem.getSupplementaryMessageInfo();
		boolean declared = false;
		boolean isLintMessage = false;
		String lintkey = null;
		if (extraDetails != null && extraDetails.endsWith("[deow=true]")) {
			declared = true;
			extraDetails = extraDetails.substring(0, extraDetails.length() - "[deow=true]".length());
		}
		if (extraDetails != null && extraDetails.indexOf("[Xlint:") != -1) {
			isLintMessage = true;
			lintkey = extraDetails.substring(extraDetails.indexOf("[Xlint:"));
			lintkey = lintkey.substring("[Xlint:".length());
			lintkey = lintkey.substring(0, lintkey.indexOf("]"));
		}

		// If the 'problem' represents a TO DO kind of thing then use the message kind that
		// represents this so AJDT sees it correctly.
		IMessage.Kind kind;
		if (problem.getID() == IProblem.Task) {
			kind = IMessage.TASKTAG;
		} else {
			if (problem.isError()) {
				kind = IMessage.ERROR;
			} else {
				kind = IMessage.WARNING;
			}
		}
		IMessage msg = null;
		if (isLintMessage) {
			msg = new LintMessage(problem.getMessage(), extraDetails, world.getLint().fromKey(lintkey), kind, sourceLocation, null,
					seeAlsoLocations, declared, problem.getID(), problem.getSourceStart(), problem.getSourceEnd());
		} else {
			msg = new Message(problem.getMessage(), extraDetails, kind, sourceLocation, null, seeAlsoLocations, declared, problem
					.getID(), problem.getSourceStart(), problem.getSourceEnd());
		}
		return msg;
	}

	public static IMessage makeErrorMessage(ICompilationUnit unit, String text, Exception ex) {
		ISourceLocation loc = new SourceLocation(new File(new String(unit.getFileName())), 0, 0, 0, "");
		IMessage msg = new Message(text, IMessage.ERROR, ex, loc);
		return msg;
	}

	public static IMessage makeErrorMessage(String srcFile, String text, Exception ex) {
		ISourceLocation loc = new SourceLocation(new File(srcFile), 0, 0, 0, "");
		IMessage msg = new Message(text, IMessage.ERROR, ex, loc);
		return msg;
	}

	private EclipseAdapterUtils() {
	}

}