/*
    * Copyright (C) 2018, Thomas Wolf <thomas.wolf@paranor.ch> 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.lib;
  
  import static org.junit.Assert.assertTrue;
  
  import java.util.List;
  
  import org.eclipse.jgit.api.Git;
  import org.eclipse.jgit.junit.RepositoryTestCase;
  import org.eclipse.jgit.revwalk.RevCommit;
  import org.eclipse.jgit.storage.file.WindowCacheConfig;
  import org.eclipse.jgit.storage.pack.PackConfig;
  import org.junit.Test;
  
  public class HugeCommitMessageTest extends RepositoryTestCase {
  
  	private static final int HUGE_SIZE = Math.max(15 * WindowCacheConfig.MB,
  			PackConfig.DEFAULT_BIG_FILE_THRESHOLD + WindowCacheConfig.MB);
  	// Larger than the 5MB fallback limit in RevWalk.getCachedBytes(RevObject
  	// obj, ObjectLoader ldr), and also larger than the default
  	// streamFileThreshold.
  
  	@Test
  	public void testHugeCommitMessage() throws Exception {
  		try (Git git = new Git(db)) {
  			writeTrashFile("foo", "foo");
  			git.add().addFilepattern("foo").call();
  			WindowCacheConfig wc = new WindowCacheConfig();
  			wc.setStreamFileThreshold(HUGE_SIZE + WindowCacheConfig.MB);
  			wc.install();
  			RevCommit commit = git.commit()
  					.setMessage(insanelyHugeCommitMessage()).call();
  			Ref master = db.findRef("master");
  			List<Ref> actual = git.branchList().setContains(commit.getName())
  					.call();
  			assertTrue("Should be contained in branch master",
  					actual.contains(master));
  		}
  	}
  
  	private String insanelyHugeCommitMessage() {
  		final String oneLine = "012345678901234567890123456789012345678901234567890123456789\n";
  		StringBuilder b = new StringBuilder(HUGE_SIZE + oneLine.length());
  		// Give the message a real header; otherwise even writing the reflog
  		// message may run into troubles because RevCommit.getShortMessage()
  		// will return the whole message.
  		b.append("An insanely huge commit message\n\n");
  		while (b.length() < HUGE_SIZE) {
  			b.append(oneLine);
  		}
  		return b.toString();
  	}
  
  }