/*
 * 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.command;

import jetbrains.buildServer.vcs.VcsException;
import org.jetbrains.annotations.NotNull;

import java.io.File;

import static com.intellij.openapi.util.io.FileUtil.delete;

public class UpdateCommand extends AuthCommand {

  private static final int UPDATE_TIMEOUT_SECONDS = 8 * 3600;//8 hours

  private String myToId;
  private String myBranchName;
  private boolean myTraceback;

  public UpdateCommand(@NotNull CommandSettings commandSettings,
                       @NotNull String hgPath,
                       @NotNull File workingDir,
                       @NotNull AuthSettings authSettings) {
    super(commandSettings, hgPath, workingDir,authSettings);
  }

  public UpdateCommand branch(@NotNull String branchName) {
    myBranchName = branchName;
    return this;
  }

  public UpdateCommand toRevision(@NotNull String revision) {
    return toRevision(new ChangeSet(revision));
  }

  public UpdateCommand toRevision(@NotNull ChangeSet cset) {
    myToId = cset.getId();
    return this;
  }

  public UpdateCommand withTraceback(boolean runWithTraceback) {
    myTraceback = runWithTraceback;
    return this;
  }

  public void call() throws VcsException {
    ensureWorkingDirIsNotLocked();

    MercurialCommandLine cli = createCommandLine();
    cli.addParameter("update");
    if (myTraceback)
      cli.addParameter("--traceback");
    addHttpAuthParams(cli);
    cli.addParameter("-C");
    cli.addParameter("-r");
    if (myToId != null) {
      cli.addParameter(myToId);
    } else {
      cli.addParameter(myBranchName);
    }
    runCommand(cli, myCommandSettings.setTimeout(UPDATE_TIMEOUT_SECONDS));
  }

  private void ensureWorkingDirIsNotLocked() {
    File lock = getWorkingDirLock();
    if (lock.exists())
      delete(lock);
  }

  @NotNull
  private File getWorkingDirLock() {
    return new File(getWorkDirectory(), ".hg" + File.separator + "wlock");
  }

  @NotNull
  @Override
  protected String getDescription() {
    StringBuilder result = new StringBuilder("hg update");
    if (myToId != null) {
      result.append(" -r ").append(myToId);
    } else {
      result.append(" -r ").append(myBranchName);
    }
    return result.toString();
  }
}