/*
    * Copyright (C) 2018, 2022 Google LLC. 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.eclipse.jgit.lib.Constants.OBJ_BLOB;
  import static org.eclipse.jgit.lib.Constants.OBJ_COMMIT;
  import static org.eclipse.jgit.lib.Constants.OBJ_TAG;
  import static org.eclipse.jgit.lib.Constants.OBJ_TREE;
  import static org.eclipse.jgit.transport.ObjectIdMatcher.hasOnlyObjectIds;
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.contains;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  
  import org.eclipse.jgit.errors.PackProtocolException;
  import org.eclipse.jgit.lib.Config;
  import org.junit.Test;
  
  public class ProtocolV0ParserTest {
  	/*
  	 * Convert the input lines to the PacketLine that the parser reads.
  	 */
  	private static PacketLineIn formatAsPacketLine(String... inputLines)
  			throws IOException {
  		ByteArrayOutputStream send = new ByteArrayOutputStream();
  		PacketLineOut pckOut = new PacketLineOut(send);
  		for (String line : inputLines) {
  			if (PacketLineIn.isEnd(line)) {
  				pckOut.end();
  			} else if (PacketLineIn.isDelimiter(line)) {
  				pckOut.writeDelim();
  			} else {
  				pckOut.writeString(line);
  			}
  		}
  
  		return new PacketLineIn(new ByteArrayInputStream(send.toByteArray()));
  	}
  
  	private static TransferConfig defaultConfig() {
  		Config rc = new Config();
  		rc.setBoolean("uploadpack", null, "allowfilter", true);
  		return new TransferConfig(rc);
  	}
  
  	@Test
  	public void testRecvWantsWithCapabilities()
  			throws PackProtocolException, IOException {
  		PacketLineIn pckIn = formatAsPacketLine(
  				String.join(" ", "want",
  						"4624442d68ee402a94364191085b77137618633e", "thin-pack",
  						"no-progress", "include-tag", "ofs-delta", "\n"),
  				"want f900c8326a43303685c46b279b9f70411bff1a4b\n",
  				PacketLineIn.end());
  		ProtocolV0Parser parser = new ProtocolV0Parser(defaultConfig());
  		FetchV0Request request = parser.recvWants(pckIn);
  		assertTrue(request.getClientCapabilities()
  				.contains(GitProtocolConstants.OPTION_THIN_PACK));
  		assertTrue(request.getClientCapabilities()
  				.contains(GitProtocolConstants.OPTION_NO_PROGRESS));
  		assertTrue(request.getClientCapabilities()
  				.contains(GitProtocolConstants.OPTION_INCLUDE_TAG));
  		assertTrue(request.getClientCapabilities()
  				.contains(GitProtocolConstants.CAPABILITY_OFS_DELTA));
  		assertThat(request.getWantIds(),
  				hasOnlyObjectIds("4624442d68ee402a94364191085b77137618633e",
  						"f900c8326a43303685c46b279b9f70411bff1a4b"));
  	}
  
  	@Test
  	public void testRecvWantsWithAgent()
  			throws PackProtocolException, IOException {
  		PacketLineIn pckIn = formatAsPacketLine(
  				String.join(" ", "want",
  						"4624442d68ee402a94364191085b77137618633e", "thin-pack",
  						"agent=JGit.test/0.0.1", "\n"),
  				"want f900c8326a43303685c46b279b9f70411bff1a4b\n",
  				PacketLineIn.end());
  		ProtocolV0Parser parser = new ProtocolV0Parser(defaultConfig());
  		FetchV0Request request = parser.recvWants(pckIn);
  		assertTrue(request.getClientCapabilities()
  				.contains(GitProtocolConstants.OPTION_THIN_PACK));
  		assertEquals(1, request.getClientCapabilities().size());
  		assertEquals("JGit.test/0.0.1", request.getAgent());
  		assertThat(request.getWantIds(),
  				hasOnlyObjectIds("4624442d68ee402a94364191085b77137618633e",
  						"f900c8326a43303685c46b279b9f70411bff1a4b"));
  	}
 
 	@Test
 	public void testRecvWantsWithSessionID()
 			throws PackProtocolException, IOException {
 		PacketLineIn pckIn = formatAsPacketLine(String.join(" ", "want",
 				"4624442d68ee402a94364191085b77137618633e", "thin-pack",
 				"agent=JGit.test/0.0.1", "session-id=client-session-id", "\n"),
 				"want f900c8326a43303685c46b279b9f70411bff1a4b\n",
 				PacketLineIn.end());
 		ProtocolV0Parser parser = new ProtocolV0Parser(defaultConfig());
 		FetchV0Request request = parser.recvWants(pckIn);
 		assertTrue(request.getClientCapabilities()
 				.contains(GitProtocolConstants.OPTION_THIN_PACK));
 		assertEquals(1, request.getClientCapabilities().size());
 		assertEquals("client-session-id", request.getClientSID());
 		assertThat(request.getWantIds(),
 				hasOnlyObjectIds("4624442d68ee402a94364191085b77137618633e",
 						"f900c8326a43303685c46b279b9f70411bff1a4b"));
 	}
 
 	/*
 	 * First round of protocol v0 negotiation. Client send wants, no
 	 * capabilities.
 	 */
 	@Test
 	public void testRecvWantsWithoutCapabilities()
 			throws PackProtocolException, IOException {
 		PacketLineIn pckIn = formatAsPacketLine(
 				"want 4624442d68ee402a94364191085b77137618633e\n",
 				"want f900c8326a43303685c46b279b9f70411bff1a4b\n",
 				PacketLineIn.end());
 		ProtocolV0Parser parser = new ProtocolV0Parser(defaultConfig());
 		FetchV0Request request = parser.recvWants(pckIn);
 		assertTrue(request.getClientCapabilities().isEmpty());
 		assertThat(request.getWantIds(),
 				hasOnlyObjectIds("4624442d68ee402a94364191085b77137618633e",
 						"f900c8326a43303685c46b279b9f70411bff1a4b"));
 	}
 
 	@Test
 	public void testRecvWantsDeepen()
 			throws PackProtocolException, IOException {
 		PacketLineIn pckIn = formatAsPacketLine(
 				"want 4624442d68ee402a94364191085b77137618633e\n",
 				"want f900c8326a43303685c46b279b9f70411bff1a4b\n", "deepen 3\n",
 				PacketLineIn.end());
 		ProtocolV0Parser parser = new ProtocolV0Parser(defaultConfig());
 		FetchV0Request request = parser.recvWants(pckIn);
 		assertTrue(request.getClientCapabilities().isEmpty());
 		assertEquals(3, request.getDepth());
 		assertThat(request.getWantIds(),
 				hasOnlyObjectIds("4624442d68ee402a94364191085b77137618633e",
 						"f900c8326a43303685c46b279b9f70411bff1a4b"));
 	}
 
 	@Test
 	public void testRecvWantsDeepenSince()
 			throws PackProtocolException, IOException {
 		PacketLineIn pckIn = formatAsPacketLine(
 				"want 4624442d68ee402a94364191085b77137618633e\n",
 				"want f900c8326a43303685c46b279b9f70411bff1a4b\n",
 				"deepen-since 1652773020\n",
 				PacketLineIn.end());
 		ProtocolV0Parser parser = new ProtocolV0Parser(defaultConfig());
 		FetchV0Request request = parser.recvWants(pckIn);
 		assertTrue(request.getClientCapabilities().isEmpty());
 		assertEquals(1652773020, request.getDeepenSince());
 		assertThat(request.getWantIds(),
 				   hasOnlyObjectIds("4624442d68ee402a94364191085b77137618633e",
 									"f900c8326a43303685c46b279b9f70411bff1a4b"));
 	}
 
 	@Test
 	public void testRecvWantsDeepenNots()
 			throws PackProtocolException, IOException {
 		PacketLineIn pckIn = formatAsPacketLine(
 				"want 4624442d68ee402a94364191085b77137618633e\n",
 				"want f900c8326a43303685c46b279b9f70411bff1a4b\n",
 				"deepen-not 856d5138d7269a483efe276d4a6b5c25b4fbb1a4\n",
 				"deepen-not heads/refs/test\n",
 				PacketLineIn.end());
 		ProtocolV0Parser parser = new ProtocolV0Parser(defaultConfig());
 		FetchV0Request request = parser.recvWants(pckIn);
 		assertTrue(request.getClientCapabilities().isEmpty());
 		assertThat(request.getDeepenNots(), contains("856d5138d7269a483efe276d4a6b5c25b4fbb1a4",
 													 "heads/refs/test"));
 		assertThat(request.getWantIds(),
 				   hasOnlyObjectIds("4624442d68ee402a94364191085b77137618633e",
 									"f900c8326a43303685c46b279b9f70411bff1a4b"));
 	}
 
 	@Test
 	public void testRecvWantsShallow()
 			throws PackProtocolException, IOException {
 		PacketLineIn pckIn = formatAsPacketLine(
 				"want 4624442d68ee402a94364191085b77137618633e\n",
 				"want f900c8326a43303685c46b279b9f70411bff1a4b\n",
 				"shallow 4b643d0ef739a1b494e7d6926d8d8ed80d35edf4\n",
 				PacketLineIn.end());
 		ProtocolV0Parser parser = new ProtocolV0Parser(defaultConfig());
 		FetchV0Request request = parser.recvWants(pckIn);
 		assertTrue(request.getClientCapabilities().isEmpty());
 		assertThat(request.getWantIds(),
 				hasOnlyObjectIds("4624442d68ee402a94364191085b77137618633e",
 						"f900c8326a43303685c46b279b9f70411bff1a4b"));
 		assertThat(request.getClientShallowCommits(),
 				hasOnlyObjectIds("4b643d0ef739a1b494e7d6926d8d8ed80d35edf4"));
 	}
 
 	@Test
 	public void testRecvWantsFilter()
 			throws PackProtocolException, IOException {
 		PacketLineIn pckIn = formatAsPacketLine(
 				"want 4624442d68ee402a94364191085b77137618633e\n",
 				"want f900c8326a43303685c46b279b9f70411bff1a4b\n",
 				"filter blob:limit=13000\n",
 				PacketLineIn.end());
 		ProtocolV0Parser parser = new ProtocolV0Parser(defaultConfig());
 		FetchV0Request request = parser.recvWants(pckIn);
 		assertTrue(request.getClientCapabilities().isEmpty());
 		assertThat(request.getWantIds(),
 				hasOnlyObjectIds("4624442d68ee402a94364191085b77137618633e",
 						"f900c8326a43303685c46b279b9f70411bff1a4b"));
 		assertTrue(request.getFilterSpec().allowsType(OBJ_BLOB));
 		assertTrue(request.getFilterSpec().allowsType(OBJ_TREE));
 		assertTrue(request.getFilterSpec().allowsType(OBJ_COMMIT));
 		assertTrue(request.getFilterSpec().allowsType(OBJ_TAG));
 		assertEquals(13000, request.getFilterSpec().getBlobLimit());
 		assertEquals(-1, request.getFilterSpec().getTreeDepthLimit());
 	}
 
 }