///usr/bin/env jbang "$0" "$@" ; exit $?
//JAVA 17+
//DEPS info.picocli:picocli:4.5.0
//DEPS org.gitlab4j:gitlab4j-api:5.0.1

import org.gitlab4j.api.Constants;
import org.gitlab4j.api.GitLabApi;
import org.gitlab4j.api.models.MergeRequest;
import picocli.CommandLine;
import picocli.CommandLine.Command;

import java.util.List;
import java.util.concurrent.Callable;

@Command(name = "autorebase", mixinStandardHelpOptions = true, version = "autorebase 0.1",
    description = "autorebase made with jbang")
class autorebase implements Callable<Integer> {

  public static final String AUTOREBASE_LABEL = "ci/autorebase";
  
  @CommandLine.Option(names = {
      "--project-id"}, description = "The gitlab project id", required = true)
  private String projectId;
  
  @CommandLine.Option(names = {"--gitlab-url"}, description = "The gitlab url", required = true)
  private String gitlabUrl;

  @CommandLine.Option(names = {"--token",
      "-t"}, description = "The gitlab access token", required = true)
  private String token;

  @CommandLine.Option(names = {
      "--ignore-certificate-errors"}, description = "ignore gitlab certificate errors", defaultValue = "true")
  private boolean ignoreCertificateErrors;

  @CommandLine.Option(names = {"--dry-run", "-d"}, defaultValue = "false")
  private boolean dryRun;

  public static void main(String... args) {
    int exitCode = new CommandLine(new autorebase()).execute(args);
    System.exit(exitCode);
  }


  @Override
  public Integer call() throws Exception {
    try (GitLabApi gitLabApi = buildGitlabApi()) {
      List<MergeRequest> mergeRequestList = gitLabApi.getMergeRequestApi()
          .getMergeRequests(projectId, Constants.MergeRequestState.OPENED);

      List<MergeRequest> openedMRList = mergeRequestList.stream()
          .filter(mr -> !Boolean.TRUE.equals(mr.getRebaseInProgress()))
          .filter(mr -> mr.getLabels().contains(AUTOREBASE_LABEL))
          .toList();

      for (MergeRequest mr : openedMRList) {
        Long mrIid = mr.getIid();
        System.out.println("Rebasing open MR [%s,%s]".formatted(mrIid, mr.getTitle()));

        if (!dryRun) {
          gitLabApi.getMergeRequestApi().rebaseMergeRequest(projectId, mrIid);
        }
      }
    }
    return 0;
  }

  private GitLabApi buildGitlabApi() {
    GitLabApi gitLabApi = new GitLabApi(gitlabUrl, token);
    gitLabApi.setIgnoreCertificateErrors(ignoreCertificateErrors);
    return gitLabApi;
  }
}