/*
 * Copyright 2000-2011 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package jetbrains.buildServer.buildTriggers.vcs.mercurial.command;

import com.intellij.execution.configurations.GeneralCommandLine;
import jetbrains.buildServer.ExecResult;
import jetbrains.buildServer.vcs.VcsException;
import org.jetbrains.annotations.NotNull;

import java.util.HashMap;
import java.util.Map;
import java.util.regex.Pattern;
import java.util.regex.Matcher;

/**
 * @author Pavel.Sher
 *         Date: 26.10.2008
 */
public class BranchesCommand extends BaseCommand {
  public BranchesCommand(@NotNull final Settings settings) {
    super(settings);
  }

  /**
   * Returns map of branch name to latest changeset in that branch
   * @return see above
   * @throws jetbrains.buildServer.vcs.VcsException if error occurs
   */
  public Map<String, ChangeSet> execute() throws VcsException {
    GeneralCommandLine cli = createCommandLine();
    cli.addParameter("branches");
    ExecResult res = runCommand(cli);
    String stdout = res.getStdout();
    Map<String, ChangeSet> result = new HashMap<String, ChangeSet>();
    Pattern branchPattern = Pattern.compile("(.*)[\\s]+([0-9]+:[A-Za-z0-9]+).*");
    for (String line: stdout.split("[\r\n]+")) {
      Matcher matcher = branchPattern.matcher(line);
      if (matcher.matches()) {
        String branchName = matcher.group(1).trim();
        String changeId = matcher.group(2).trim();
        result.put(branchName, new ChangeSet(changeId));
      }
    }
    return result;
  }
}