/*
 * 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;
	}
}