/*
 *  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 "modules/rtp_rtcp/source/rtcp_packet/tmmbr.h"

#include <cstdint>

#include "modules/rtp_rtcp/source/rtcp_packet/tmmb_item.h"
#include "rtc_base/buffer.h"
#include "test/gmock.h"
#include "test/gtest.h"
#include "test/rtcp_packet_parser.h"

using ::testing::ElementsAreArray;
using ::testing::make_tuple;
using webrtc::rtcp::TmmbItem;
using webrtc::rtcp::Tmmbr;

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

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

  Buffer packet = tmmbr.Build();

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

TEST(RtcpPacketTmmbrTest, Parse) {
  Tmmbr tmmbr;
  EXPECT_TRUE(test::ParseSinglePacket(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.SetSenderSsrc(kSenderSsrc);
  tmmbr.AddTmmbr(TmmbItem(kRemoteSsrc, kBitrateBps, kOverhead));
  tmmbr.AddTmmbr(TmmbItem(kRemoteSsrc + 1, 4 * kBitrateBps, kOverhead + 1));

  Buffer packet = tmmbr.Build();

  Tmmbr parsed;
  EXPECT_TRUE(test::ParseSinglePacket(packet, &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(test::ParseSinglePacket(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(test::ParseSinglePacket(kUnalignedPacket, &tmmbr));
}
}  // namespace webrtc