package ru.ulstu.extractor;

import org.eclipse.jgit.api.Git;
import org.eclipse.jgit.api.errors.GitAPIException;
import org.eclipse.jgit.internal.storage.file.FileRepository;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

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

import static org.apache.logging.log4j.util.Strings.isBlank;

@Service
public class GitRepositoryService {
    @Value("${extractor.custom-projects-dir}")
    private String customProjectsDir;


    public void cloneOrUpdateRepo(String url) throws GitAPIException, IOException {
        Git git;
        if (projectDirExists(getProjectDirectoryFile(url))) {
            Repository localRepo = new FileRepository(getProjectGitDirectory(url));
            git = new Git(localRepo);
            git.pull().call();
        } else {
            git = Git.cloneRepository()
                    .setURI(url)
                    .setDirectory(getProjectDirectoryFile(url))
                    .call();
        }
        Iterable<RevCommit> commits = git.log().call();
        commits.forEach(c -> System.out.println(c.getFullMessage()));
    }

    private String getProjectDirectory(String url) {
        return (isBlank(customProjectsDir)
                ? System.getProperty("java.io.tmpdir")
                : customProjectsDir) + url.substring(url.lastIndexOf('/'));
    }

    private String getProjectGitDirectory(String url) {
        return getProjectDirectory(url) + "/.git";
    }

    private File getProjectDirectoryFile(String url) {
        return Path.of(getProjectDirectory(url))
                .toFile();
    }

    private boolean projectDirExists(File file) {
        return file.exists();
    }
}