/*
 *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#include "webrtc/modules/rtp_rtcp/source/rtcp_packet/tmmbr.h"

#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"

using testing::ElementsAreArray;
using testing::IsEmpty;
using testing::make_tuple;
using webrtc::rtcp::TmmbItem;
using webrtc::rtcp::Tmmbr;
using webrtc::RTCPUtility::RtcpCommonHeader;
using webrtc::RTCPUtility::RtcpParseCommonHeader;

namespace webrtc {
namespace {
const uint32_t kSenderSsrc = 0x12345678;
const uint32_t kRemoteSsrc = 0x23456789;
const uint32_t kBitrateBps = 312000;
const uint16_t kOverhead = 0x1fe;
const uint8_t kPacket[] = {0x83,  205, 0x00, 0x04,
                           0x12, 0x34, 0x56, 0x78,
                           0x00, 0x00, 0x00, 0x00,
                           0x23, 0x45, 0x67, 0x89,
                           0x0a, 0x61, 0x61, 0xfe};

bool ParseTmmbr(const uint8_t* buffer, size_t length, Tmmbr* tmmbr) {
  RtcpCommonHeader header;
  EXPECT_TRUE(RtcpParseCommonHeader(buffer, length, &header));
  EXPECT_EQ(length, header.BlockSize());
  return tmmbr->Parse(header, buffer + RtcpCommonHeader::kHeaderSizeBytes);
}
}  // namespace

TEST(RtcpPacketTmmbrTest, Create) {
  Tmmbr tmmbr;
  tmmbr.From(kSenderSsrc);
  tmmbr.WithTmmbr(TmmbItem(kRemoteSsrc, kBitrateBps, kOverhead));

  rtc::Buffer packet = tmmbr.Build();

  EXPECT_THAT(make_tuple(packet.data(), packet.size()),
              ElementsAreArray(kPacket));
}

TEST(RtcpPacketTmmbrTest, Parse) {
  Tmmbr tmmbr;
  EXPECT_TRUE(ParseTmmbr(kPacket, sizeof(kPacket), &tmmbr));
  const Tmmbr& parsed = tmmbr;

  EXPECT_EQ(kSenderSsrc, parsed.sender_ssrc());
  ASSERT_EQ(1u, parsed.requests().size());
  EXPECT_EQ(kRemoteSsrc, parsed.requests().front().ssrc());
  EXPECT_EQ(kBitrateBps, parsed.requests().front().bitrate_bps());
  EXPECT_EQ(kOverhead, parsed.requests().front().packet_overhead());
}

TEST(RtcpPacketTmmbrTest, CreateAndParseWithTwoEntries) {
  Tmmbr tmmbr;
  tmmbr.From(kSenderSsrc);
  tmmbr.WithTmmbr(TmmbItem(kRemoteSsrc, kBitrateBps, kOverhead));
  tmmbr.WithTmmbr(TmmbItem(kRemoteSsrc + 1, 4 * kBitrateBps, kOverhead + 1));

  rtc::Buffer packet = tmmbr.Build();

  Tmmbr parsed;
  EXPECT_TRUE(ParseTmmbr(packet.data(), packet.size(), &parsed));

  EXPECT_EQ(kSenderSsrc, parsed.sender_ssrc());
  EXPECT_EQ(2u, parsed.requests().size());
  EXPECT_EQ(kRemoteSsrc, parsed.requests()[0].ssrc());
  EXPECT_EQ(kRemoteSsrc + 1, parsed.requests()[1].ssrc());
}

TEST(RtcpPacketTmmbrTest, ParseFailsWithoutItems) {
  const uint8_t kZeroItemsPacket[] = {0x83,  205, 0x00, 0x02,
                                      0x12, 0x34, 0x56, 0x78,
                                      0x00, 0x00, 0x00, 0x00};

  Tmmbr tmmbr;
  EXPECT_FALSE(ParseTmmbr(kZeroItemsPacket, sizeof(kZeroItemsPacket), &tmmbr));
}

TEST(RtcpPacketTmmbrTest, ParseFailsOnUnAlignedPacket) {
  const uint8_t kUnalignedPacket[] = {0x83,  205, 0x00, 0x05,
                                      0x12, 0x34, 0x56, 0x78,
                                      0x00, 0x00, 0x00, 0x00,
                                      0x23, 0x45, 0x67, 0x89,
                                      0x0a, 0x61, 0x61, 0xfe,
                                      0x34, 0x56, 0x78, 0x9a};

  Tmmbr tmmbr;
  EXPECT_FALSE(ParseTmmbr(kUnalignedPacket, sizeof(kUnalignedPacket), &tmmbr));
}
}  // namespace webrtc