/*
    * Copyright (C) 2016, 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.transport;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  
  import org.eclipse.jgit.lib.Constants;
  import org.eclipse.jgit.lib.ObjectId;
  import org.eclipse.jgit.lib.ObjectInserter;
  import org.eclipse.jgit.transport.RefAdvertiser.PacketLineOutRefAdvertiser;
  import org.eclipse.jgit.util.NB;
  import org.junit.Test;
  
  public class RefAdvertiserTest {
  	@Test
  	public void advertiser() throws IOException {
  		ByteArrayOutputStream buf = new ByteArrayOutputStream();
  		PacketLineOut pckOut = new PacketLineOut(buf);
  		PacketLineOutRefAdvertiser adv = new PacketLineOutRefAdvertiser(pckOut);
  
  		// Advertisement of capability and id both happen in order of call,
  		// which may not match Git standards. Callers are responsible for
  		// making calls in the correct ordering. Here in this test we do them
  		// in a "wrong" order to assert the method just writes to the network.
  
  		adv.advertiseCapability("test-1");
  		adv.advertiseCapability("sideband");
  		adv.advertiseId(id(1), "refs/heads/master");
  		adv.advertiseId(id(4), "refs/" + padStart("F", 987));
  		adv.advertiseId(id(2), "refs/heads/next");
  		adv.advertiseId(id(3), "refs/Iñtërnâtiônàlizætiøn☃💩");
  		adv.end();
  		assertFalse(adv.isEmpty());
  
  		PacketLineIn pckIn = new PacketLineIn(
  				new ByteArrayInputStream(buf.toByteArray()));
  		String s = pckIn.readStringRaw();
  		assertEquals(id(1).name() + " refs/heads/master\0 test-1 sideband\n",
  				s);
  
  		s = pckIn.readStringRaw();
  		assertEquals(id(4).name() + " refs/" + padStart("F", 987) + '\n', s);
  
  		s = pckIn.readStringRaw();
  		assertEquals(id(2).name() + " refs/heads/next\n", s);
  
  		s = pckIn.readStringRaw();
  		assertEquals(id(3).name() + " refs/Iñtërnâtiônàlizætiøn☃💩\n", s);
  
  		s = pckIn.readStringRaw();
  		assertTrue(PacketLineIn.isEnd(s));
  	}
  
  	private static ObjectId id(int i) {
  		try (ObjectInserter.Formatter f = new ObjectInserter.Formatter()) {
  			byte[] tmp = new byte[4];
  			NB.encodeInt32(tmp, 0, i);
  			return f.idFor(Constants.OBJ_BLOB, tmp);
  		}
  	}
  
  	private static String padStart(String s, int len) {
  		StringBuilder b = new StringBuilder(len);
  		for (int i = s.length(); i < len; i++) {
  			b.append((char) ('a' + (i % 26)));
  		}
  		return b.append(s).toString();
  	}
  }