/*
    * Copyright (C) 2021, Google Inc. and others
    *
    * This program and the accompanying materials are made available under the
    * terms of the Eclipse Distribution License v. 1.0 which is available at
    * https://www.eclipse.org/org/documents/edl-v10.php.
    *
    * SPDX-License-Identifier: BSD-3-Clause
    */
  package org.eclipse.jgit.gitrepo;
  
  import static org.eclipse.jgit.lib.Constants.DEFAULT_REMOTE_NAME;
  import static org.eclipse.jgit.lib.Constants.R_REMOTES;
  
  import java.io.IOException;
  import java.util.List;
  
  import org.eclipse.jgit.api.Git;
  import org.eclipse.jgit.api.SubmoduleAddCommand;
  import org.eclipse.jgit.api.errors.GitAPIException;
  import org.eclipse.jgit.gitrepo.RepoCommand.ManifestErrorException;
  import org.eclipse.jgit.gitrepo.RepoProject.CopyFile;
  import org.eclipse.jgit.gitrepo.RepoProject.LinkFile;
  import org.eclipse.jgit.gitrepo.internal.RepoText;
  import org.eclipse.jgit.internal.JGitText;
  import org.eclipse.jgit.lib.ObjectId;
  import org.eclipse.jgit.lib.ProgressMonitor;
  import org.eclipse.jgit.lib.Ref;
  import org.eclipse.jgit.lib.Repository;
  import org.eclipse.jgit.revwalk.RevCommit;
  
  /**
   * Writes .gitmodules and gitlinks of parsed manifest projects into a regular
   * repository (using git submodule commands)
   *
   * To write on a bare repository, use {@link BareSuperprojectWriter}
   */
  class RegularSuperprojectWriter {
  
  	private Repository repo;
  
  	private ProgressMonitor monitor;
  
  	RegularSuperprojectWriter(Repository repo, ProgressMonitor monitor) {
  		this.repo = repo;
  		this.monitor = monitor;
  	}
  
  	RevCommit write(List<RepoProject> repoProjects)
  			throws GitAPIException {
  		try (Git git = new Git(repo)) {
  			for (RepoProject proj : repoProjects) {
  				addSubmodule(proj.getName(), proj.getUrl(), proj.getPath(),
  						proj.getRevision(), proj.getCopyFiles(),
  						proj.getLinkFiles(), git);
  			}
  			return git.commit().setMessage(RepoText.get().repoCommitMessage)
  					.call();
  		} catch (IOException e) {
  			throw new ManifestErrorException(e);
  		}
  	}
  
  	private void addSubmodule(String name, String url, String path,
  			String revision, List<CopyFile> copyfiles, List<LinkFile> linkfiles,
  			Git git) throws GitAPIException, IOException {
  		assert (!repo.isBare());
  		assert (git != null);
  		if (!linkfiles.isEmpty()) {
  			throw new UnsupportedOperationException(
  					JGitText.get().nonBareLinkFilesNotSupported);
  		}
  
  		SubmoduleAddCommand add = git.submoduleAdd().setName(name).setPath(path)
  				.setURI(url);
  		if (monitor != null) {
  			add.setProgressMonitor(monitor);
  		}
  
  		Repository subRepo = add.call();
  		if (revision != null) {
  			try (Git sub = new Git(subRepo)) {
  				sub.checkout().setName(findRef(revision, subRepo)).call();
  			}
  			subRepo.close();
  			git.add().addFilepattern(path).call();
  		}
  		for (CopyFile copyfile : copyfiles) {
  			copyfile.copy();
  			git.add().addFilepattern(copyfile.dest).call();
  		}
  	}
  
  	private static String findRef(String ref, Repository repo)
  			throws IOException {
  		if (!ObjectId.isId(ref)) {
  			Ref r = repo.exactRef(R_REMOTES + DEFAULT_REMOTE_NAME + "/" + ref); //$NON-NLS-1$
  			if (r != null) {
  				return r.getName();
 			}
 		}
 		return ref;
 	}
 }