package com.aragost.javahg.internals;

 import java.io.File;

 import java.util.Map;

 import com.aragost.javahg.Repository;

 import com.google.common.annotations.VisibleForTesting;

 import com.google.common.collect.Maps;

 public class CopyRenameHelper {

     public static Map<File, File> parse(Repository repo, File[] files, LineIterator output, String prefix){

         Map<File, File> result = Maps.newHashMap();

         // Make all files relative to repository

         for (int i = 0; i < files.length; i++) {

             File file = files[i];

             files[i] = repo.relativeFile(file);

         }

         int currentSrc = 0;

         File src = files[currentSrc];

         for (String line : output) {

             if (line.startsWith(prefix)) {

                 if (!line.substring(prefix.length()).startsWith(src.getPath())) {

                     currentSrc++;

                     src = files[currentSrc];

                 }

                 String[] names = CopyRenameHelper.parseCopyLine(line, prefix);

                 if (names != null) {

                         result.put(new File(names[1]), new File(names[0]));

                 }

             } else {

                 throw new UnexpectedCommandOutputException("could not parse '" + line + "'");

             }

         }

         return result;

     }

     @VisibleForTesting

     public static String[] parseCopyLine(String line, String prefix) {

         line = line.substring(prefix.length()).trim();

         int nCut = line.indexOf(" to ");

         if (nCut < 0) {

                 return null;

         }

         return new String[] { line.substring(0, nCut), line.substring(nCut + 4)};

     }

 }