/*
 * Copyright (C) 2018, 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.transport.ObjectIdMatcher.hasOnlyObjectIds;
import static org.hamcrest.MatcherAssert.assertThat;
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"));
	}

	/*
	 * 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 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"));
		assertEquals(13000, request.getFilterSpec().getBlobLimit());
		assertEquals(-1, request.getFilterSpec().getTreeDepthLimit());
	}

}