/*
 * Copyright (c) 2025, Alliance for Open Media. All rights reserved
 *
 * This source code is subject to the terms of the BSD 3-Clause Clear License
 * and the Alliance for Open Media Patent License 1.0. If the BSD 3-Clause Clear
 * License was not distributed with this source code in the LICENSE file, you
 * can obtain it at aomedia.org/license/software-license/bsd-3-c-c/.  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
 * aomedia.org/license/patent-license/.
 */

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

#include "third_party/googletest/src/googletest/include/gtest/gtest.h"
#include "test/register_state_check.h"
#include "test/function_equivalence_test.h"

#include "config/aom_config.h"
#include "config/aom_dsp_rtcd.h"
#include "config/av1_rtcd.h"

#include "aom/aom_integer.h"
#include "av1/common/enums.h"
#include "av1/encoder/trellis_quant.h"

using libaom_test::FunctionEquivalenceTest;

namespace {

template <typename F, typename T>
class TcqRateTest : public FunctionEquivalenceTest<F> {
 protected:
  static const int kIterations = 100000;

  virtual ~TcqRateTest() {}

  virtual void Execute(T *rate_tst) = 0;

  void Common() {
    Execute(&rate_tst_);

    ASSERT_EQ(rate_ref_.rate_zero[0], rate_tst_.rate_zero[0]);
    ASSERT_EQ(rate_ref_.rate_zero[1], rate_tst_.rate_zero[1]);
    ASSERT_EQ(rate_ref_.rate_eob[0], rate_tst_.rate_eob[0]);
    ASSERT_EQ(rate_ref_.rate_eob[1], rate_tst_.rate_eob[1]);
    for (int i = 0; i < 8; i++) {
      ASSERT_EQ(rate_ref_.rate[i], rate_tst_.rate[i]);
    }
  }

  T rate_ref_;
  T rate_tst_;
};

//////////////////////////////////////////////////////////////////////////////
// TCQ Rate calculation functions.
//////////////////////////////////////////////////////////////////////////////

typedef void (*TcqRateLuma)(const struct tcq_param_t *p,
                            const struct prequant_t *pq,
                            const struct tcq_coeff_ctx_t *coeff_ctx,
                            int blk_pos, int diag_ctx, int eob_rate,
                            struct tcq_rate_t *rd);
typedef libaom_test::FuncParam<TcqRateLuma> TcqRateLumaTestFuncs;

class TcqRateLumaTest : public TcqRateTest<TcqRateLuma, tcq_rate_t> {
 protected:
  void Execute(tcq_rate_t *rate_tst) {
    params_.ref_func(&param_, &pre_quant_, &coeff_ctx_, blk_pos_, diag_ctx_,
                     eob_rate_, &rate_ref_);
    ASM_REGISTER_STATE_CHECK(params_.tst_func(&param_, &pre_quant_, &coeff_ctx_,
                                              blk_pos_, diag_ctx_, eob_rate_,
                                              rate_tst));
  }
  tcq_param_t param_;
  LV_MAP_COEFF_COST txb_costs_;
  prequant_t pre_quant_;
  tcq_coeff_ctx_t coeff_ctx_;
  int blk_pos_;
  int diag_ctx_;
  int eob_rate_;
};

typedef void (*TcqRateLfLuma)(const struct tcq_param_t *p,
                              const struct prequant_t *pq,
                              const struct tcq_coeff_ctx_t *coeff_ctx,
                              int blk_pos, int diag_ctx, int eob_rate,
                              int coeff_sign, struct tcq_rate_t *rd);
typedef libaom_test::FuncParam<TcqRateLfLuma> TcqRateLfLumaTestFuncs;

class TcqRateLfLumaTest : public TcqRateTest<TcqRateLfLuma, tcq_rate_t> {
 protected:
  void Execute(tcq_rate_t *rate_tst) {
    params_.ref_func(&param_, &pre_quant_, &coeff_ctx_, blk_pos_, diag_ctx_,
                     eob_rate_, coeff_sign_, &rate_ref_);
    ASM_REGISTER_STATE_CHECK(params_.tst_func(&param_, &pre_quant_, &coeff_ctx_,
                                              blk_pos_, diag_ctx_, eob_rate_,
                                              coeff_sign_, rate_tst));
  }
  tcq_param_t param_;
  LV_MAP_COEFF_COST txb_costs_;
  prequant_t pre_quant_;
  tcq_coeff_ctx_t coeff_ctx_;
  int blk_pos_;
  int diag_ctx_;
  int eob_rate_;
  int coeff_sign_;
  int tmp_sign_[1024];
};

static int generate_random_q_idx(libaom_test::ACMRandom *rng) {
  int r1 = rng->Rand8() & 15;
  int r2 = (r1 == 15) ? rng->Rand8() & 15 : 0;
  int r3 = (r2 == 15) ? rng->Rand16() & 8191 : 0;
  int r = r1 + r2 + r3;
  return r;
}

// Init coeff syntax costs randomly
// - base_cost[], lps_cost[], base_eob_cost[]
// - base_cost_zero[], base_cost_low_tbl[], base_eob_cost_tbl[], mid_cost_tbl[]
static void generate_random_cost_tables(libaom_test::ACMRandom *rng,
                                        LV_MAP_COEFF_COST *txb_costs) {
  int max = 2048 - 1;
  int n;
  int *p0;

  // Init sign costs
  n = sizeof(txb_costs->dc_sign_cost) / sizeof(txb_costs->dc_sign_cost[0][0]);
  p0 = txb_costs->dc_sign_cost[0][0];
  for (int i = 0; i < n; i++) {
    *p0++ = rng->Rand16() & max;
  }

  // Init base costs
  n = sizeof(txb_costs->base_cost) / sizeof(txb_costs->base_cost[0][0][0]);
  p0 = &txb_costs->base_cost[0][0][0];
  for (int i = 0; i < n; i++) {
    *p0++ = rng->Rand16() & max;
  }
  n = sizeof(txb_costs->base_lf_cost) /
      sizeof(txb_costs->base_lf_cost[0][0][0]);
  p0 = &txb_costs->base_lf_cost[0][0][0];
  for (int i = 0; i < n; i++) {
    *p0++ = rng->Rand16() & max;
  }

  // Init mid-range (lps) costs
  n = sizeof(txb_costs->lps_cost) / sizeof(txb_costs->lps_cost[0][0]);
  p0 = &txb_costs->lps_cost[0][0];
  for (int i = 0; i < n; i++) {
    *p0++ = rng->Rand16() & max;
  }
  n = sizeof(txb_costs->lps_lf_cost) / sizeof(txb_costs->lps_lf_cost[0][0]);
  p0 = &txb_costs->lps_lf_cost[0][0];
  for (int i = 0; i < n; i++) {
    *p0++ = rng->Rand16() & max;
  }

  // Init base_eob costs
  n = sizeof(txb_costs->base_eob_cost) / sizeof(txb_costs->base_eob_cost[0][0]);
  p0 = &txb_costs->base_eob_cost[0][0];
  for (int i = 0; i < n; i++) {
    *p0++ = rng->Rand16() & max;
  }
  n = sizeof(txb_costs->base_lf_eob_cost) /
      sizeof(txb_costs->base_lf_eob_cost[0][0]);
  p0 = &txb_costs->base_lf_eob_cost[0][0];
  for (int i = 0; i < n; i++) {
    *p0++ = rng->Rand16() & max;
  }

  // Rearrange costs into base_cost_zero[] array for quicker access.
  // (from av1/encoder/rd.c)
  for (int q_i = 0; q_i < TCQ_CTXS; q_i++) {
    for (int ctx = 0; ctx < SIG_COEF_CONTEXTS; ++ctx) {
      txb_costs->base_cost_zero[q_i][ctx] = txb_costs->base_cost[ctx][q_i][0];
    }
  }
  // Rearrange costs into base_lf_cost_zero[] array for quicker access.
  for (int q_i = 0; q_i < TCQ_CTXS; q_i++) {
    for (int ctx = 0; ctx < LF_SIG_COEF_CONTEXTS; ++ctx) {
      txb_costs->base_lf_cost_zero[q_i][ctx] =
          txb_costs->base_lf_cost[ctx][q_i][0];
    }
  }
  // Precompute some base_costs for trellis, interleaved for quick access.
  // Look-up take to retrive data from precomputed cost array
  static const uint8_t trel_abslev[15][4] = {
    { 2, 1, 1, 2 },  // qIdx=1
    { 2, 3, 1, 2 },  // qidx=2
    { 2, 3, 3, 2 },  // qidx=3
    { 2, 3, 3, 4 },  // qidx=4
    { 4, 3, 3, 4 },  // qidx=5
    { 4, 5, 3, 4 },  // qidx=6
    { 4, 5, 5, 4 },  // qidx=7
    { 4, 5, 5, 6 },  // qidx=8
    { 6, 5, 5, 6 },  // qidx=9
    { 6, 7, 5, 6 },  // qidx=10
    { 6, 7, 7, 6 },  // qidx=11
    { 6, 7, 7, 8 },  // qidx=12
    { 8, 7, 7, 8 },  // qidx=13
    { 8, 9, 7, 8 },  // qidx=14
    { 8, 9, 9, 8 },  // qidx=15
  };
  for (int idx = 0; idx < 5; idx++) {
    int a0 = AOMMIN(trel_abslev[idx][0], 3);
    int a1 = AOMMIN(trel_abslev[idx][1], 3);
    int a2 = AOMMIN(trel_abslev[idx][2], 3);
    int a3 = AOMMIN(trel_abslev[idx][3], 3);
    for (int ctx = 0; ctx < SIG_COEF_CONTEXTS; ++ctx) {
      // Q0, absLev 0 / 2
      txb_costs->base_cost_low_tbl[idx][ctx][0][0] =
          txb_costs->base_cost[ctx][0][a0] + av1_cost_literal(1);
      txb_costs->base_cost_low_tbl[idx][ctx][0][1] =
          txb_costs->base_cost[ctx][0][a2] + av1_cost_literal(1);
      // Q1, absLev 1 / 3
      txb_costs->base_cost_low_tbl[idx][ctx][1][0] =
          txb_costs->base_cost[ctx][1][a1] + av1_cost_literal(1);
      txb_costs->base_cost_low_tbl[idx][ctx][1][1] =
          txb_costs->base_cost[ctx][1][a3] + av1_cost_literal(1);
    }
    for (int ctx = 0; ctx < SIG_COEF_CONTEXTS_EOB; ++ctx) {
      // EOB coeff, absLev 0 / 2
      txb_costs->base_eob_cost_tbl[idx][ctx][0] =
          txb_costs->base_eob_cost[ctx][a0 - 1] + av1_cost_literal(1);
      txb_costs->base_eob_cost_tbl[idx][ctx][1] =
          txb_costs->base_eob_cost[ctx][a2 - 1] + av1_cost_literal(1);
    }
  }
  for (int idx = 0; idx < 9; idx++) {
    int max = LF_BASE_SYMBOLS - 1;
    int a0 = AOMMIN(trel_abslev[idx][0], max);
    int a1 = AOMMIN(trel_abslev[idx][1], max);
    int a2 = AOMMIN(trel_abslev[idx][2], max);
    int a3 = AOMMIN(trel_abslev[idx][3], max);
    for (int ctx = 0; ctx < LF_SIG_COEF_CONTEXTS; ++ctx) {
      // Q0, absLev 0 / 2
      txb_costs->base_lf_cost_low_tbl[idx][ctx][0][0] =
          txb_costs->base_lf_cost[ctx][0][a0] + av1_cost_literal(1);
      txb_costs->base_lf_cost_low_tbl[idx][ctx][0][1] =
          txb_costs->base_lf_cost[ctx][0][a2] + av1_cost_literal(1);
      // Q1, absLev 1 / 3
      txb_costs->base_lf_cost_low_tbl[idx][ctx][1][0] =
          txb_costs->base_lf_cost[ctx][1][a1] + av1_cost_literal(1);
      txb_costs->base_lf_cost_low_tbl[idx][ctx][1][1] =
          txb_costs->base_lf_cost[ctx][1][a3] + av1_cost_literal(1);
    }
    for (int ctx = 0; ctx < SIG_COEF_CONTEXTS_EOB; ++ctx) {
      // EOB coeff, absLev 0 / 2
      txb_costs->base_lf_eob_cost_tbl[idx][ctx][0] =
          txb_costs->base_lf_eob_cost[ctx][a0 - 1] + av1_cost_literal(1);
      txb_costs->base_lf_eob_cost_tbl[idx][ctx][1] =
          txb_costs->base_lf_eob_cost[ctx][a2 - 1] + av1_cost_literal(1);
    }
  }
  // Precalc mid costs for default region.
  for (int idx = 0; idx < 5 + 2 * COEFF_BASE_RANGE; idx++) {
    int a0 = get_low_range(trel_abslev[idx][0], 0);
    int a1 = get_low_range(trel_abslev[idx][1], 0);
    int a2 = get_low_range(trel_abslev[idx][2], 0);
    int a3 = get_low_range(trel_abslev[idx][3], 0);
    for (int ctx = 0; ctx < LEVEL_CONTEXTS; ++ctx) {
      // Q0, absLev 0 / 2
      txb_costs->mid_cost_tbl[idx][ctx][0][0] =
          a0 < 0 ? 0 : txb_costs->lps_cost[ctx][a0];
      txb_costs->mid_cost_tbl[idx][ctx][0][1] =
          a2 < 0 ? 0 : txb_costs->lps_cost[ctx][a2];
      // Q1, absLev 1 / 3
      txb_costs->mid_cost_tbl[idx][ctx][1][0] =
          a1 < 0 ? 0 : txb_costs->lps_cost[ctx][a1];
      txb_costs->mid_cost_tbl[idx][ctx][1][1] =
          a3 < 0 ? 0 : txb_costs->lps_cost[ctx][a3];
    }
  }
  // Precalc mid costs for default region.
  for (int idx = 0; idx < 9 + 2 * COEFF_BASE_RANGE; idx++) {
    int a0 = get_low_range(trel_abslev[idx][0], 1);
    int a1 = get_low_range(trel_abslev[idx][1], 1);
    int a2 = get_low_range(trel_abslev[idx][2], 1);
    int a3 = get_low_range(trel_abslev[idx][3], 1);
    for (int ctx = 0; ctx < LF_LEVEL_CONTEXTS; ++ctx) {
      // Q0, absLev 0 / 2
      txb_costs->mid_lf_cost_tbl[idx][ctx][0][0] =
          a0 < 0 ? 0 : txb_costs->lps_lf_cost[ctx][a0];
      txb_costs->mid_lf_cost_tbl[idx][ctx][0][1] =
          a2 < 0 ? 0 : txb_costs->lps_lf_cost[ctx][a2];
      // Q1, absLev 1 / 3
      txb_costs->mid_lf_cost_tbl[idx][ctx][1][0] =
          a1 < 0 ? 0 : txb_costs->lps_lf_cost[ctx][a1];
      txb_costs->mid_lf_cost_tbl[idx][ctx][1][1] =
          a3 < 0 ? 0 : txb_costs->lps_lf_cost[ctx][a3];
    }
  }
}

TEST_P(TcqRateLumaTest, RandomValues) {
  for (int iter = 0; iter < kIterations && !HasFatalFailure(); ++iter) {
    int log_scale = 1;
    int shift = 16 - log_scale + QUANT_FP_BITS;
    const int32_t quant[2] = { 1 << shift, 1 << shift };
    int dqv = 1 << QUANT_TABLE_BITS;
    int tqc = iter < 16000 ? iter : generate_random_q_idx(&rng_);

    // Initialize param structure.
    int bwl = 2 + (rng_.Rand8() & 3);
    int height = 1 << bwl;
    int max = (1 << bwl) - 1;
    int row = rng_.Rand8() & max;
    int col = rng_.Rand8() & max;
    row = AOMMAX(row, 4);
    col = AOMMAX(col, 4);
    int blk_pos = (row << bwl) + col;
    int scan_pos = blk_pos;
    int diag_ctx = get_nz_map_ctx_from_stats(0, blk_pos, bwl, TX_CLASS_2D, 0);

    blk_pos_ = blk_pos;
    diag_ctx_ = diag_ctx;
    param_.bwl = bwl;
    param_.txb_height = height;
    param_.tx_class = 0;
    param_.txb_costs = &txb_costs_;

    // Generate random syntax costs.
    generate_random_cost_tables(&rng_, &txb_costs_);

    // Generate pre_quant info with random coeff.
    av1_pre_quant_c(tqc, &pre_quant_, quant, dqv, log_scale, scan_pos);
    eob_rate_ = rng_(512 * 4);

    // Generate random coeff_ctx
    for (int i = 0; i < 8; i++) {
      coeff_ctx_.coef[i] = (rng_(4) << 4) + rng_(4);
    }
    coeff_ctx_.coef_eob = get_lower_levels_ctx_eob(bwl, height, scan_pos);
    coeff_ctx_.pad[0] = 0;
    coeff_ctx_.pad[1] = 0;
    coeff_ctx_.pad[2] = 0;

    Common();
  }
}

TEST_P(TcqRateLfLumaTest, RandomValues) {
  for (int iter = 0; iter < kIterations && !HasFatalFailure(); ++iter) {
    int log_scale = 1;
    int shift = 16 - log_scale + QUANT_FP_BITS;
    const int32_t quant[2] = { 1 << shift, 1 << shift };
    int dqv = 1 << QUANT_TABLE_BITS;
    int tqc = iter < 16000 ? iter : generate_random_q_idx(&rng_);

    // Initialize param structure.
    int bwl = 2 + (rng_.Rand8() & 3);
    int height = 1 << bwl;
    int diag = rng_.Rand8() & 3;
    int row = rng_.Rand8() % (diag + 1);
    int col = diag - row;
    int blk_pos = (row << bwl) + col;
    int scan_pos = blk_pos;
    int diag_ctx = get_nz_map_ctx_from_stats_lf(0, blk_pos, bwl, TX_CLASS_2D);
    if (scan_pos > 0) {
      diag_ctx += 7 << 8;
    }

    blk_pos_ = blk_pos;
    diag_ctx_ = diag_ctx;
    coeff_sign_ = rng_.Rand8() & 1;
    param_.bwl = bwl;
    param_.txb_height = height;
    param_.tx_class = 0;
    param_.txb_costs = &txb_costs_;
    param_.tmp_sign = tmp_sign_;
    param_.dc_sign_ctx = rng_.Rand8() % DC_SIGN_CONTEXTS;
    tmp_sign_[blk_pos] = rng_.Rand8() % CROSS_COMPONENT_CONTEXTS;

    // Generate random syntax costs.
    generate_random_cost_tables(&rng_, &txb_costs_);

    // Generate pre_quant info with random coeff.
    av1_pre_quant_c(tqc, &pre_quant_, quant, dqv, log_scale, scan_pos);
    eob_rate_ = rng_(512 * 4);

    // Generate random coeff_ctx
    for (int i = 0; i < 8; i++) {
      coeff_ctx_.coef[i] = (rng_(4) << 4) + rng_(4);
    }
    coeff_ctx_.coef_eob = get_lower_levels_ctx_eob(bwl, height, scan_pos);
    coeff_ctx_.pad[0] = 0;
    coeff_ctx_.pad[1] = 0;
    coeff_ctx_.pad[2] = 0;

    Common();
  }
}

#if HAVE_AVX2
INSTANTIATE_TEST_SUITE_P(
    AVX2, TcqRateLumaTest,
    ::testing::Values(TcqRateLumaTestFuncs(av1_get_rate_dist_def_luma_c,
                                           av1_get_rate_dist_def_luma_avx2)));

INSTANTIATE_TEST_SUITE_P(
    AVX2, TcqRateLfLumaTest,
    ::testing::Values(TcqRateLfLumaTestFuncs(av1_get_rate_dist_lf_luma_c,
                                             av1_get_rate_dist_lf_luma_avx2)));
#endif  // HAVE_AVX2

}  // namespace