/*
 * Copyright (c) 2024, 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 "config/av1_rtcd.h"
#include "test/acm_random.h"
#include "test/util.h"
#include "aom_ports/aom_timer.h"
#include "aom_ports/bitops.h"
#include "third_party/googletest/src/googletest/include/gtest/gtest.h"

namespace {

using ::testing::Combine;
using ::testing::Values;
using ::testing::ValuesIn;

using std::make_tuple;
using std::tuple;

const int kIters = 1000;

typedef tuple<int, int> FrameDimension;

// Resolutions (width x height) to be tested for resizing.
const FrameDimension kFrameDim[] = {
  make_tuple(3840, 2160), make_tuple(2560, 1440), make_tuple(1920, 1080),
  make_tuple(1280, 720),  make_tuple(640, 480),   make_tuple(640, 360),
  make_tuple(256, 256),
};

// Check that two 8-bit output buffers are identical.
void AssertOutputBufferEq(const uint8_t *p1, const uint8_t *p2, int width,
                          int height) {
  ASSERT_TRUE(p1 != p2) << "Buffers must be at different memory locations";
  for (int j = 0; j < height; ++j) {
    if (memcmp(p1, p2, sizeof(*p1) * width) == 0) {
      p1 += width;
      p2 += width;
      continue;
    }
    for (int i = 0; i < width; ++i) {
      ASSERT_EQ(p1[i], p2[i])
          << width << "x" << height << " Pixel mismatch at (" << i << ", " << j
          << ")";
    }
  }
}

typedef bool (*LowBDResizeFunc)(uint8_t *intbuf, uint8_t *output,
                                int out_stride, int height, int height2,
                                int stride, int start_wd);
// Test parameter list:
//  <tst_fun, dims>
typedef tuple<LowBDResizeFunc, FrameDimension> ResizeTestParams;

class AV1ResizeYTest : public ::testing::TestWithParam<ResizeTestParams> {
 public:
  void SetUp() {
    test_fun_ = GET_PARAM(0);
    frame_dim_ = GET_PARAM(1);
    width_ = std::get<0>(frame_dim_);
    height_ = std::get<1>(frame_dim_);
    const int msb = get_msb(AOMMIN(width_, height_));
    n_levels_ = AOMMAX(msb - MIN_PYRAMID_SIZE_LOG2, 1);

    src_ = (uint8_t *)aom_malloc((width_ / 2) * height_ * sizeof(*src_));
    ref_dest_ =
        (uint8_t *)aom_calloc((width_ * height_) / 4, sizeof(*ref_dest_));
    test_dest_ =
        (uint8_t *)aom_calloc((width_ * height_) / 4, sizeof(*test_dest_));
  }

  void RunTest() {
    int width2 = width_, height2 = height_;

    for (int i = 0; i < (width_ / 2) * height_; i++) src_[i] = rng_.Rand8();
    for (int level = 1; level < n_levels_; level++) {
      width2 = (width_ >> level);
      height2 = (height_ >> level);
      resize_vert_dir_c(src_, ref_dest_, width2, height2 << 1, height2, width2,
                        0);
      test_fun_(src_, test_dest_, width2, height2 << 1, height2, width2, 0);

      AssertOutputBufferEq(ref_dest_, test_dest_, width2, height2);
    }
  }

  void SpeedTest() {
    int width2 = width_, height2 = height_;

    for (int i = 0; i < (width_ / 2) * height_; i++) src_[i] = rng_.Rand8();
    for (int level = 1; level < n_levels_; level++) {
      width2 = (width_ >> level);
      height2 = (height_ >> level);
      aom_usec_timer ref_timer;
      aom_usec_timer_start(&ref_timer);
      for (int j = 0; j < kIters; j++) {
        resize_vert_dir_c(src_, ref_dest_, width2, height2 << 1, height2,
                          width2, 0);
      }
      aom_usec_timer_mark(&ref_timer);
      const int64_t ref_time = aom_usec_timer_elapsed(&ref_timer);

      aom_usec_timer tst_timer;
      aom_usec_timer_start(&tst_timer);
      for (int j = 0; j < kIters; j++) {
        test_fun_(src_, test_dest_, width2, height2 << 1, height2, width2, 0);
      }
      aom_usec_timer_mark(&tst_timer);
      const int64_t tst_time = aom_usec_timer_elapsed(&tst_timer);

      std::cout << "level: " << level << " [" << width2 << " x " << height2
                << "] C time = " << ref_time << " , SIMD time = " << tst_time
                << " scaling=" << float(1.00) * ref_time / tst_time << "x \n";
    }
  }

  void TearDown() {
    aom_free(src_);
    aom_free(ref_dest_);
    aom_free(test_dest_);
  }

 private:
  LowBDResizeFunc test_fun_;
  FrameDimension frame_dim_;
  int width_;
  int height_;
  int n_levels_;
  uint8_t *src_;
  uint8_t *ref_dest_;
  uint8_t *test_dest_;
  libaom_test::ACMRandom rng_;
};

GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(AV1ResizeYTest);

TEST_P(AV1ResizeYTest, RunTest) { RunTest(); }

TEST_P(AV1ResizeYTest, DISABLED_SpeedTest) { SpeedTest(); }

#if HAVE_AVX2
INSTANTIATE_TEST_SUITE_P(
    AVX2, AV1ResizeYTest,
    ::testing::Combine(::testing::Values(resize_vert_dir_avx2),
                       ::testing::ValuesIn(kFrameDim)));
#endif

}  // namespace