/**
 * Return the current build user.
 *
 * @param causes build causes.
 * @param envVars environment variables.
 * @return user name.
 */
public static String prepareBuildUserName(List<Cause> causes, EnvVars envVars) {
  String buildUser = "anonymous";

  // For multi branch jobs, while PR building.
  if (Util.fixEmpty(envVars.get("CHANGE_AUTHOR")) != null) {
    return envVars.get("CHANGE_AUTHOR");
  }

  if (causes != null && causes.size() > 0) {
    if (causes.get(0) instanceof UserIdCause) {
      buildUser = ((UserIdCause) causes.get(0)).getUserName();
    } else if (causes.get(0) instanceof UpstreamCause) {
      List<Cause> upstreamCauses = ((UpstreamCause) causes.get(0)).getUpstreamCauses();
      buildUser = prepareBuildUserName(upstreamCauses, envVars);
    }
  }
  return buildUser;
}
 

/**
 * Retrun the build cause.
 *
 * @return build cause.
 */
public static String prepareBuildCause(List<Cause> causes) {
  String buildCause = null;

  if (causes != null && causes.size() > 0) {
    for (Cause cause : causes) {

      if (cause instanceof UserIdCause) {
        buildCause = ((UserIdCause) causes.get(0)).getUserName();
      } else if (cause instanceof UpstreamCause) {
        List<Cause> upstreamCauses = ((UpstreamCause) cause).getUpstreamCauses();
        buildCause = prepareBuildCause(upstreamCauses);
      } else {
        buildCause = cause.getClass().getSimpleName();
      }
    }
  }
  return buildCause == null ? buildCause : buildCause.replace("Cause", "");
}
 

private static List<GitLabBranchBuild> findBuildsFromUpstreamCauses(List<Cause> causes) {
    for (Cause cause : causes) {
        if (cause instanceof UpstreamCause) {
            List<Cause> upCauses = ((UpstreamCause) cause).getUpstreamCauses();    // Non null, returns empty list when none are set
            for (Cause upCause : upCauses) {
                if (upCause instanceof GitLabWebHookCause) {
                    GitLabWebHookCause gitlabCause = (GitLabWebHookCause) upCause;
                    return Collections.singletonList(
                            new GitLabBranchBuild(gitlabCause.getData().getSourceProjectId().toString(),
                                    gitlabCause.getData().getLastCommit()));
                }
            }
            List<GitLabBranchBuild> builds = findBuildsFromUpstreamCauses(upCauses);
            if (!builds.isEmpty()) {
                return builds;
            }
        }
    }
    return Collections.emptyList();
}
 

/**
 * Return the current build user.
 *
 * @param causes build causes.
 * @return user name.
 */
protected static String prepareBuildUserId(List<Cause> causes) {
  String buildUser = "anonymous";
  if (causes != null && causes.size() > 0) {
    if (causes.get(0) instanceof UserIdCause) {
      buildUser = ((UserIdCause) causes.get(0)).getUserId();
    } else if (causes.get(0) instanceof UpstreamCause) {
      List<Cause> upstreamCauses = ((UpstreamCause) causes.get(0)).getUpstreamCauses();
      buildUser = prepareBuildUserId(upstreamCauses);
    }
  }
  return Util.fixEmpty(buildUser) == null ? "anonymous" : buildUser;
}
 

/**
 * Return the current build user Id.
 *
 * @param causes build causes.
 * @param envVars environment variables.
 * @return user name.
 */
public static String prepareBuildUserId(List<Cause> causes, EnvVars envVars) {
  String buildUserId = null;

  if (causes != null && causes.size() > 0) {
    if (causes.get(0) instanceof UserIdCause) {
      buildUserId = ((UserIdCause) causes.get(0)).getUserId();
    } else if (causes.get(0) instanceof UpstreamCause) {
      List<Cause> upstreamCauses = ((UpstreamCause) causes.get(0)).getUpstreamCauses();
      buildUserId = prepareBuildUserId(upstreamCauses, envVars);
    }
  }
  return buildUserId;
}
 

public DynamicBuildFactory upstreamStart(String branch) {
    Cause cause = mock(UpstreamCause.class);
    when(build.getCauses()).thenReturn(Lists.newArrayList(cause));
    addBranchParam(branch);
    return this;
}