/*
 * Copyright (c) 2016, Alliance for Open Media. All rights reserved.
 *
 * This source code is subject to the terms of the BSD 2 Clause License and
 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
 * was not distributed with this source code in the LICENSE file, you can
 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
 * Media Patent License 1.0 was not distributed with this source code in the
 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
 */

#include <tuple>

#include "gtest/gtest.h"

#include "config/av1_rtcd.h"

#include "test/acm_random.h"
#include "test/register_state_check.h"
#include "test/util.h"
#include "av1/common/enums.h"

namespace {

using libaom_test::ACMRandom;
using std::tuple;

using Predictor = void (*)(uint8_t *dst, ptrdiff_t stride, TX_SIZE tx_size,
                           const uint8_t *above, const uint8_t *left, int mode);

// Note:
//  Test parameter list:
//  Reference predictor, optimized predictor, prediction mode, tx size
//
using PredFuncMode = tuple<Predictor, Predictor, int>;
using PredParams = tuple<PredFuncMode, TX_SIZE>;

const int MaxTxSize = 32;

const int MaxTestNum = 100;

class AV1FilterIntraPredTest : public ::testing::TestWithParam<PredParams> {
 public:
  ~AV1FilterIntraPredTest() override = default;
  void SetUp() override {
    PredFuncMode funcMode = GET_PARAM(0);
    predFuncRef_ = std::get<0>(funcMode);
    predFunc_ = std::get<1>(funcMode);
    mode_ = std::get<2>(funcMode);
    txSize_ = GET_PARAM(1);

    alloc_ = new uint8_t[2 * MaxTxSize + 1];
    predRef_ = new uint8_t[MaxTxSize * MaxTxSize];
    pred_ = new uint8_t[MaxTxSize * MaxTxSize];
    ASSERT_NE(alloc_, nullptr);
    ASSERT_NE(predRef_, nullptr);
    ASSERT_NE(pred_, nullptr);
  }

  void TearDown() override {
    delete[] alloc_;
    delete[] predRef_;
    delete[] pred_;
  }

 protected:
  void RunTest() const {
    int tstIndex = 0;
    int stride = tx_size_wide[txSize_];
    uint8_t *left = alloc_;
    uint8_t *above = alloc_ + MaxTxSize;
    while (tstIndex < MaxTestNum) {
      PrepareBuffer();
      predFuncRef_(predRef_, stride, txSize_, &above[1], left, mode_);
      API_REGISTER_STATE_CHECK(
          predFunc_(pred_, stride, txSize_, &above[1], left, mode_));
      DiffPred(tstIndex);
      tstIndex += 1;
    }
  }
  void RunSpeedTest() const {
    int stride = tx_size_wide[txSize_];
    uint8_t *left = alloc_;
    uint8_t *above = alloc_ + MaxTxSize;
    const int numIter = 5000;

    PrepareBuffer();
    aom_usec_timer ref_timer;
    aom_usec_timer_start(&ref_timer);
    for (int i = 0; i < numIter; i++) {
      predFuncRef_(predRef_, stride, txSize_, &above[1], left, mode_);
    }
    aom_usec_timer_mark(&ref_timer);

    aom_usec_timer timer;
    aom_usec_timer_start(&timer);
    for (int i = 0; i < numIter; i++) {
      predFunc_(pred_, stride, txSize_, &above[1], left, mode_);
    }
    aom_usec_timer_mark(&timer);

    const int ref_sum_time =
        static_cast<int>(aom_usec_timer_elapsed(&ref_timer));
    const int sum_time = static_cast<int>(aom_usec_timer_elapsed(&timer));

    printf("c_time = %d \t simd_time = %d \t Gain = %4.2f \t mode =  %d \n",
           ref_sum_time, sum_time,
           (static_cast<float>(ref_sum_time) / static_cast<float>(sum_time)),
           static_cast<int>(mode_));

    DiffPred(0);
  }

 private:
  void PrepareBuffer() const {
    ACMRandom rnd(ACMRandom::DeterministicSeed());
    int i = 0;
    while (i < (2 * MaxTxSize + 1)) {
      alloc_[i] = rnd.Rand8();
      i++;
    }
  }

  void DiffPred(int testNum) const {
    int i = 0;
    while (i < tx_size_wide[txSize_] * tx_size_high[txSize_]) {
      EXPECT_EQ(predRef_[i], pred_[i]) << "Error at position: " << i << " "
                                       << "Tx size: " << tx_size_wide[txSize_]
                                       << "x" << tx_size_high[txSize_] << " "
                                       << "Test number: " << testNum;
      i++;
    }
  }

  Predictor predFunc_;
  Predictor predFuncRef_;
  int mode_;
  TX_SIZE txSize_;
  uint8_t *alloc_;
  uint8_t *pred_;
  uint8_t *predRef_;
};

TEST_P(AV1FilterIntraPredTest, BitExactCheck) { RunTest(); }

TEST_P(AV1FilterIntraPredTest, DISABLED_Speed) { RunSpeedTest(); }

using ::testing::make_tuple;
#if HAVE_SSE4_1
const PredFuncMode kPredFuncMdArray[] = {
  make_tuple(&av1_filter_intra_predictor_c, &av1_filter_intra_predictor_sse4_1,
             FILTER_DC_PRED),
  make_tuple(&av1_filter_intra_predictor_c, &av1_filter_intra_predictor_sse4_1,
             FILTER_V_PRED),
  make_tuple(&av1_filter_intra_predictor_c, &av1_filter_intra_predictor_sse4_1,
             FILTER_H_PRED),
  make_tuple(&av1_filter_intra_predictor_c, &av1_filter_intra_predictor_sse4_1,
             FILTER_D157_PRED),
  make_tuple(&av1_filter_intra_predictor_c, &av1_filter_intra_predictor_sse4_1,
             FILTER_PAETH_PRED),
};

const TX_SIZE kTxSize[] = { TX_4X4,  TX_8X8,  TX_16X16, TX_32X32, TX_4X8,
                            TX_8X4,  TX_8X16, TX_16X8,  TX_16X32, TX_32X16,
                            TX_4X16, TX_16X4, TX_8X32,  TX_32X8 };

INSTANTIATE_TEST_SUITE_P(
    SSE4_1, AV1FilterIntraPredTest,
    ::testing::Combine(::testing::ValuesIn(kPredFuncMdArray),
                       ::testing::ValuesIn(kTxSize)));
#endif  // HAVE_SSE4_1

#if HAVE_NEON
const PredFuncMode kPredFuncMdArrayNEON[] = {
  make_tuple(&av1_filter_intra_predictor_c, &av1_filter_intra_predictor_neon,
             FILTER_DC_PRED),
  make_tuple(&av1_filter_intra_predictor_c, &av1_filter_intra_predictor_neon,
             FILTER_V_PRED),
  make_tuple(&av1_filter_intra_predictor_c, &av1_filter_intra_predictor_neon,
             FILTER_H_PRED),
  make_tuple(&av1_filter_intra_predictor_c, &av1_filter_intra_predictor_neon,
             FILTER_D157_PRED),
  make_tuple(&av1_filter_intra_predictor_c, &av1_filter_intra_predictor_neon,
             FILTER_PAETH_PRED),
};

const TX_SIZE kTxSizeNEON[] = { TX_4X4,  TX_8X8,  TX_16X16, TX_32X32, TX_4X8,
                                TX_8X4,  TX_8X16, TX_16X8,  TX_16X32, TX_32X16,
                                TX_4X16, TX_16X4, TX_8X32,  TX_32X8 };

INSTANTIATE_TEST_SUITE_P(
    NEON, AV1FilterIntraPredTest,
    ::testing::Combine(::testing::ValuesIn(kPredFuncMdArrayNEON),
                       ::testing::ValuesIn(kTxSizeNEON)));
#endif  // HAVE_NEON

}  // namespace
