/*
 * Copyright 2000-2014 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;

import jetbrains.buildServer.buildTriggers.vcs.mercurial.command.HgVcsRoot;
import jetbrains.buildServer.buildTriggers.vcs.mercurial.command.exception.MercurialNotFoundException;
import jetbrains.buildServer.vcs.TestConnectionSupport;
import jetbrains.buildServer.vcs.VcsException;
import jetbrains.buildServer.vcs.VcsRoot;
import org.jetbrains.annotations.NotNull;

import java.io.File;

/**
 * @author dmitry.neverov
 */
public class HgTestConnectionSupport implements TestConnectionSupport {

  private final HgVcsRootFactory myHgVcsRootFactory;
  private final RepoFactory myRepoFactory;
  private final MirrorManager myMirrorManager;
  private final HgPathProvider myHgPathProvider;

  public HgTestConnectionSupport(@NotNull HgVcsRootFactory hgVcsRootFactory,
                                 @NotNull RepoFactory repoFactory,
                                 @NotNull MirrorManager mirrorManager,
                                 @NotNull HgPathProvider hgPathProvider) {
    myHgVcsRootFactory = hgVcsRootFactory;
    myRepoFactory = repoFactory;
    myMirrorManager = mirrorManager;
    myHgPathProvider = hgPathProvider;
  }


  public String testConnection(@NotNull VcsRoot vcsRoot) throws VcsException {
    final HgVcsRoot root = myHgVcsRootFactory.createHgRoot(vcsRoot);
    final HgRepo repo = createRepo(root);
    try {
      repo.id().repository(root.getRepository())
              .withAuthSettings(root.getAuthSettings())
              .call();
      return null;
    } catch (MercurialNotFoundException e) {
      throw friendlyException(root, e);
    }
  }


  private VcsException friendlyException(HgVcsRoot root, MercurialNotFoundException e) {
    return new VcsException("Cannot find mercurial executable at path '" + myHgPathProvider.getHgPath(root) + "'", e);
  }

  @NotNull
  private HgRepo createRepo(HgVcsRoot root) throws VcsException {
    return myRepoFactory.createRepo(root, getWorkingDir(root));
  }

  private File getWorkingDir(HgVcsRoot root) {
    File customDir = root.getCustomWorkingDir();
    return customDir != null ? customDir : myMirrorManager.getMirrorDir(root.getRepository());
  }
}