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package org.codehaus.plexus.compiler.csharp;

import org.codehaus.plexus.compiler.CompilerMessage;
import org.codehaus.plexus.util.StringUtils;

/**
 * Handles output from both mono with only the line number
 * 
 * ex error = "/home/trygvis/dev/com.myrealbox/trunk/mcs/nunit20/core/./TestRunnerThread.cs(29) error CS0246: Cannot find type 'NameValueCollection'"
 * 
 * 
 * and errors from mono & csc on windows which has column num also
 * 
 * ex error = "src\\test\\csharp\\Hierarchy\\Logger.cs(98,4): warning CS0618: 'NUnit.Framework.Assertion' is obsolete: 'Use Assert class instead'";
 *
 * @author Gilles Dodinet
 * @author Trygve Laugstøl
 * @author Matthew Pocock
 * @author Chris Stevenson
 */
public class DefaultCSharpCompilerParser {

    private static String ERROR_PREFIX = "error ";

    private static String COMPILATION_PREFIX = "Compilation ";

    private static String MAGIC_LINE_MARKER = ".cs(";

    private static String MAGIC_LINE_MARKER_2 = ")";

    public static CompilerMessage parseLine(String line) {
        CompilerMessage ce = null;

        if (isOutputWithNoColumnNumber(line)) {
            ce = parseLineWithNoColumnNumber(line);
        } else {
            ce = parseLineWithColumnNumberAndLineNumber(line);
        }

        return ce;
    }

    private static boolean isOutputWithNoColumnNumber(String line) {

        int i = line.indexOf(MAGIC_LINE_MARKER);

        if (i == -1) {
            return true;
        }

        String chunk1 = line.substring(i + MAGIC_LINE_MARKER.length());

        int j = chunk1.indexOf(MAGIC_LINE_MARKER_2);

        String chunk2 = chunk1.substring(0, j);

        return !chunk2.contains(",");
    }

    private static CompilerMessage parseLineWithNoColumnNumber(String line) {

        String file = null;
        boolean error = true;
        int startline = -1;
        int startcolumn = -1;
        int endline = -1;
        int endcolumn = -1;
        String message;

        if (line.startsWith(ERROR_PREFIX)) {
            message = line.substring(ERROR_PREFIX.length());
        } else if (line.startsWith(COMPILATION_PREFIX)) {
            // ignore

            return null;
        } else if (line.contains(MAGIC_LINE_MARKER)) {
            int i = line.indexOf(MAGIC_LINE_MARKER);

            int j = line.indexOf(' ', i);

            file = line.substring(0, i + 3);

            String num = line.substring(i + MAGIC_LINE_MARKER.length(), j - 1);

            startline = Integer.parseInt(num);

            endline = startline;

            message = line.substring(j + 1 + ERROR_PREFIX.length());

            error = line.contains(") error");
        } else {
            System.err.println("Unknown output: " + line);

            return null;
        }

        return new CompilerMessage(file, error, startline, startcolumn, endline, endcolumn, message);
    }

    private static CompilerMessage parseLineWithColumnNumberAndLineNumber(String line) {

        String file = null;
        boolean error = true;
        int startline = -1;
        int startcolumn = -1;
        int endline = -1;
        int endcolumn = -1;
        String message;

        if (line.startsWith(ERROR_PREFIX)) {
            message = line.substring(ERROR_PREFIX.length());
        } else if (line.startsWith(COMPILATION_PREFIX)) {
            return null;
        } else if (line.contains(MAGIC_LINE_MARKER)) {
            int i = line.indexOf(MAGIC_LINE_MARKER);

            int j = line.indexOf(' ', i);

            file = line.substring(0, i + 3);

            String linecol = line.substring(i + MAGIC_LINE_MARKER.length(), j - 2);

            String linenum = null;
            String colnum = null;

            if (linecol.contains(",") && linecol.split(",").length == 2) {
                linenum = linecol.split(",")[0];
                colnum = linecol.split(",")[1];
            } else if (linecol.split(",").length == 1) {
                linenum = linecol.split(",")[0];
                colnum = "-1";
            } else {
                linenum = linecol.trim();
                colnum = "-1";
            }

            startline = StringUtils.isEmpty(linenum) ? -1 : Integer.parseInt(linenum);

            startcolumn = StringUtils.isEmpty(colnum) ? -1 : Integer.parseInt(colnum);

            endline = startline;

            endcolumn = startcolumn;

            message = line.substring(j + 1 + ERROR_PREFIX.length());

            error = line.contains("): error");
        } else {
            System.err.println("Unknown output: " + line);

            return null;
        }

        return new CompilerMessage(file, error, startline, startcolumn, endline, endcolumn, message);
    }
}