package com.sap.ais.security.nwdicodeql.service;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;

import org.eclipse.jgit.api.Git;
import org.eclipse.jgit.api.errors.GitAPIException;
import org.eclipse.jgit.lib.PersonIdent;
import org.eclipse.jgit.transport.UsernamePasswordCredentialsProvider;

public class GitHubOrphanBranchCreator {

  private static final String REMOTE_URL   = "https://your_git_uri.git";
  private static final String USERNAME     = "your_login_user_id";
  private static final String ACCESS_TOKEN = "access_token";

  private static final String NEW_BRANCH_NAME = "my_orphan_branch";

  public static void main(String[] args) {
    Path tempDirectory = null;
    try {
      tempDirectory = Files.createTempDirectory("testing_orphan_branch");
      // Clone the remote repository
      Git git = Git.cloneRepository().setURI(REMOTE_URL).setDirectory(tempDirectory.toFile())
          .setCredentialsProvider(new UsernamePasswordCredentialsProvider(USERNAME, ACCESS_TOKEN)).call();

      // Create an orphan branch, but do NOT set the flag to create a new branch!!!!
      git.checkout().setOrphan(true).setName(NEW_BRANCH_NAME).call();

      // delete all files in the working directory
      git.rm().addFilepattern(".").call();

      // Create a new file in the orphan branch
      Files.write(tempDirectory.resolve("config.yml"), "just some sample content".getBytes());

      // Add the new file to the index
      git.add().addFilepattern("config.yml").call();

      // Make an initial commit
      git.commit().setMessage("Initial commit with dummy file")
          .setCommitter(new PersonIdent(USERNAME, "john@example.com")).call();

      // Push the orphan branch to GitHub
      git.push().setCredentialsProvider(new UsernamePasswordCredentialsProvider(USERNAME, ACCESS_TOKEN)).call();

      // Clean up local repository
      git.getRepository().close();

      System.out.println("Orphan branch created and pushed successfully.");
    } catch (GitAPIException | IOException e) {
      e.printStackTrace();
    } finally {
      if (tempDirectory != null) {
        deleteDirectory(tempDirectory.toFile());
      }
    }
  }

  // Helper method to delete a directory recursively
  private static void deleteDirectory(File directory) {
    if (directory.exists()) {
      File[] files = directory.listFiles();
      if (files != null) {
        for (File file : files) {
          if (file.isDirectory()) {
            deleteDirectory(file);
          } else {
            file.delete();
          }
        }
      }
      directory.delete();
    }
  }
}