/*
 * 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 <math.h>
#include <stdlib.h>
#include <string.h>

#include "third_party/googletest/src/include/gtest/gtest.h"

#include "./av1_rtcd.h"
#include "./aom_dsp_rtcd.h"
#include "test/acm_random.h"
#include "test/clear_system_state.h"
#include "test/register_state_check.h"
#include "test/util.h"
#include "av1/common/blockd.h"
#include "av1/common/scan.h"
#include "aom/aom_integer.h"
#include "av1/common/av1_inv_txfm.h"

using libaom_test::ACMRandom;

namespace {
const double kInvSqrt2 = 0.707106781186547524400844362104;

void reference_idct_1d(const double *in, double *out, int size) {
  for (int n = 0; n < size; ++n) {
    out[n] = 0;
    for (int k = 0; k < size; ++k) {
      if (k == 0)
        out[n] += kInvSqrt2 * in[k] * cos(PI * (2 * n + 1) * k / (2 * size));
      else
        out[n] += in[k] * cos(PI * (2 * n + 1) * k / (2 * size));
    }
  }
}

typedef void (*IdctFuncRef)(const double *in, double *out, int size);
typedef void (*IdctFunc)(const tran_low_t *in, tran_low_t *out);

class TransTestBase {
 public:
  virtual ~TransTestBase() {}

 protected:
  void RunInvAccuracyCheck() {
    tran_low_t *input = new tran_low_t[txfm_size_];
    tran_low_t *output = new tran_low_t[txfm_size_];
    double *ref_input = new double[txfm_size_];
    double *ref_output = new double[txfm_size_];

    ACMRandom rnd(ACMRandom::DeterministicSeed());
    const int count_test_block = 5000;
    for (int ti = 0; ti < count_test_block; ++ti) {
      for (int ni = 0; ni < txfm_size_; ++ni) {
        input[ni] = rnd.Rand8() - rnd.Rand8();
        ref_input[ni] = static_cast<double>(input[ni]);
      }

      fwd_txfm_(input, output);
      fwd_txfm_ref_(ref_input, ref_output, txfm_size_);

      for (int ni = 0; ni < txfm_size_; ++ni) {
        EXPECT_LE(
            abs(output[ni] - static_cast<tran_low_t>(round(ref_output[ni]))),
            max_error_);
      }
    }

    delete[] input;
    delete[] output;
    delete[] ref_input;
    delete[] ref_output;
  }

  double max_error_;
  int txfm_size_;
  IdctFunc fwd_txfm_;
  IdctFuncRef fwd_txfm_ref_;
};

typedef std::tr1::tuple<IdctFunc, IdctFuncRef, int, int> IdctParam;
class AV1InvTxfm : public TransTestBase,
                   public ::testing::TestWithParam<IdctParam> {
 public:
  virtual void SetUp() {
    fwd_txfm_ = GET_PARAM(0);
    fwd_txfm_ref_ = GET_PARAM(1);
    txfm_size_ = GET_PARAM(2);
    max_error_ = GET_PARAM(3);
  }
  virtual void TearDown() {}
};

TEST_P(AV1InvTxfm, RunInvAccuracyCheck) { RunInvAccuracyCheck(); }

INSTANTIATE_TEST_CASE_P(
    C, AV1InvTxfm,
    ::testing::Values(IdctParam(&av1_idct4_c, &reference_idct_1d, 4, 1),
                      IdctParam(&av1_idct8_c, &reference_idct_1d, 8, 2),
                      IdctParam(&av1_idct16_c, &reference_idct_1d, 16, 4),
                      IdctParam(&av1_idct32_c, &reference_idct_1d, 32, 6)));

#if CONFIG_AV1_ENCODER
typedef void (*FwdTxfmFunc)(const int16_t *in, tran_low_t *out, int stride);
typedef void (*InvTxfmFunc)(const tran_low_t *in, uint8_t *out, int stride);
typedef std::tr1::tuple<FwdTxfmFunc, InvTxfmFunc, InvTxfmFunc, TX_SIZE, int>
    PartialInvTxfmParam;
const int kMaxNumCoeffs = 1024;
class AV1PartialIDctTest
    : public ::testing::TestWithParam<PartialInvTxfmParam> {
 public:
  virtual ~AV1PartialIDctTest() {}
  virtual void SetUp() {
    ftxfm_ = GET_PARAM(0);
    full_itxfm_ = GET_PARAM(1);
    partial_itxfm_ = GET_PARAM(2);
    tx_size_ = GET_PARAM(3);
    last_nonzero_ = GET_PARAM(4);
  }

  virtual void TearDown() { libaom_test::ClearSystemState(); }

 protected:
  int last_nonzero_;
  TX_SIZE tx_size_;
  FwdTxfmFunc ftxfm_;
  InvTxfmFunc full_itxfm_;
  InvTxfmFunc partial_itxfm_;
};

TEST_P(AV1PartialIDctTest, RunQuantCheck) {
  ACMRandom rnd(ACMRandom::DeterministicSeed());
  int size;
  switch (tx_size_) {
    case TX_4X4: size = 4; break;
    case TX_8X8: size = 8; break;
    case TX_16X16: size = 16; break;
    case TX_32X32: size = 32; break;
    default: FAIL() << "Wrong Size!"; break;
  }
  DECLARE_ALIGNED(16, tran_low_t, test_coef_block1[kMaxNumCoeffs]);
  DECLARE_ALIGNED(16, tran_low_t, test_coef_block2[kMaxNumCoeffs]);
  DECLARE_ALIGNED(16, uint8_t, dst1[kMaxNumCoeffs]);
  DECLARE_ALIGNED(16, uint8_t, dst2[kMaxNumCoeffs]);

  const int count_test_block = 1000;
  const int block_size = size * size;

  DECLARE_ALIGNED(16, int16_t, input_extreme_block[kMaxNumCoeffs]);
  DECLARE_ALIGNED(16, tran_low_t, output_ref_block[kMaxNumCoeffs]);

  int max_error = 0;
  for (int i = 0; i < count_test_block; ++i) {
    // clear out destination buffer
    memset(dst1, 0, sizeof(*dst1) * block_size);
    memset(dst2, 0, sizeof(*dst2) * block_size);
    memset(test_coef_block1, 0, sizeof(*test_coef_block1) * block_size);
    memset(test_coef_block2, 0, sizeof(*test_coef_block2) * block_size);

    ACMRandom rnd(ACMRandom::DeterministicSeed());

    for (int i = 0; i < count_test_block; ++i) {
      // Initialize a test block with input range [-255, 255].
      if (i == 0) {
        for (int j = 0; j < block_size; ++j) input_extreme_block[j] = 255;
      } else if (i == 1) {
        for (int j = 0; j < block_size; ++j) input_extreme_block[j] = -255;
      } else {
        for (int j = 0; j < block_size; ++j) {
          input_extreme_block[j] = rnd.Rand8() % 2 ? 255 : -255;
        }
      }

      ftxfm_(input_extreme_block, output_ref_block, size);

      // quantization with maximum allowed step sizes
      test_coef_block1[0] = (output_ref_block[0] / 1336) * 1336;
      for (int j = 1; j < last_nonzero_; ++j)
        test_coef_block1[get_scan(tx_size_, DCT_DCT, 0)->scan[j]] =
            (output_ref_block[j] / 1828) * 1828;
    }

    ASM_REGISTER_STATE_CHECK(full_itxfm_(test_coef_block1, dst1, size));
    ASM_REGISTER_STATE_CHECK(partial_itxfm_(test_coef_block1, dst2, size));

    for (int j = 0; j < block_size; ++j) {
      const int diff = dst1[j] - dst2[j];
      const int error = diff * diff;
      if (max_error < error) max_error = error;
    }
  }

  EXPECT_EQ(0, max_error)
      << "Error: partial inverse transform produces different results";
}

TEST_P(AV1PartialIDctTest, ResultsMatch) {
  ACMRandom rnd(ACMRandom::DeterministicSeed());
  int size;
  switch (tx_size_) {
    case TX_4X4: size = 4; break;
    case TX_8X8: size = 8; break;
    case TX_16X16: size = 16; break;
    case TX_32X32: size = 32; break;
    default: FAIL() << "Wrong Size!"; break;
  }
  DECLARE_ALIGNED(16, tran_low_t, test_coef_block1[kMaxNumCoeffs]);
  DECLARE_ALIGNED(16, tran_low_t, test_coef_block2[kMaxNumCoeffs]);
  DECLARE_ALIGNED(16, uint8_t, dst1[kMaxNumCoeffs]);
  DECLARE_ALIGNED(16, uint8_t, dst2[kMaxNumCoeffs]);
  const int count_test_block = 1000;
  const int max_coeff = 32766 / 4;
  const int block_size = size * size;
  int max_error = 0;
  for (int i = 0; i < count_test_block; ++i) {
    // clear out destination buffer
    memset(dst1, 0, sizeof(*dst1) * block_size);
    memset(dst2, 0, sizeof(*dst2) * block_size);
    memset(test_coef_block1, 0, sizeof(*test_coef_block1) * block_size);
    memset(test_coef_block2, 0, sizeof(*test_coef_block2) * block_size);
    int max_energy_leftover = max_coeff * max_coeff;
    for (int j = 0; j < last_nonzero_; ++j) {
      int16_t coef = static_cast<int16_t>(sqrt(1.0 * max_energy_leftover) *
                                          (rnd.Rand16() - 32768) / 65536);
      max_energy_leftover -= coef * coef;
      if (max_energy_leftover < 0) {
        max_energy_leftover = 0;
        coef = 0;
      }
      test_coef_block1[get_scan(tx_size_, DCT_DCT, 0)->scan[j]] = coef;
    }

    memcpy(test_coef_block2, test_coef_block1,
           sizeof(*test_coef_block2) * block_size);

    ASM_REGISTER_STATE_CHECK(full_itxfm_(test_coef_block1, dst1, size));
    ASM_REGISTER_STATE_CHECK(partial_itxfm_(test_coef_block2, dst2, size));

    for (int j = 0; j < block_size; ++j) {
      const int diff = dst1[j] - dst2[j];
      const int error = diff * diff;
      if (max_error < error) max_error = error;
    }
  }

  EXPECT_EQ(0, max_error)
      << "Error: partial inverse transform produces different results";
}
using std::tr1::make_tuple;

INSTANTIATE_TEST_CASE_P(
    C, AV1PartialIDctTest,
    ::testing::Values(make_tuple(&av1_fdct32x32_c, &av1_idct32x32_1024_add_c,
                                 &av1_idct32x32_34_add_c, TX_32X32, 34),
                      make_tuple(&av1_fdct32x32_c, &av1_idct32x32_1024_add_c,
                                 &av1_idct32x32_1_add_c, TX_32X32, 1),
                      make_tuple(&av1_fdct16x16_c, &av1_idct16x16_256_add_c,
                                 &av1_idct16x16_10_add_c, TX_16X16, 10),
                      make_tuple(&av1_fdct16x16_c, &av1_idct16x16_256_add_c,
                                 &av1_idct16x16_1_add_c, TX_16X16, 1),
                      make_tuple(&av1_fdct8x8_c, &av1_idct8x8_64_add_c,
                                 &av1_idct8x8_12_add_c, TX_8X8, 12),
                      make_tuple(&av1_fdct8x8_c, &av1_idct8x8_64_add_c,
                                 &av1_idct8x8_1_add_c, TX_8X8, 1),
                      make_tuple(&av1_fdct4x4_c, &av1_idct4x4_16_add_c,
                                 &av1_idct4x4_1_add_c, TX_4X4, 1)));
#endif  // CONFIG_AV1_ENCODER
}  // namespace