// Copyright 2024 Google LLC
// SPDX-License-Identifier: BSD-2-Clause

#include <array>
#include <string>

#include "avif/avif.h"
#include "aviftest_helpers.h"
#include "gtest/gtest.h"

namespace avif {
namespace {

// Used to pass the data folder path to the GoogleTest suites.
const char* data_path = nullptr;

TEST(KeyframeTest, Decode) {
  if (!testutil::Av1DecoderAvailable()) {
    GTEST_SKIP() << "AV1 Codec unavailable, skip test.";
  }

  DecoderPtr decoder(avifDecoderCreate());
  ASSERT_NE(decoder, nullptr);
  const std::string file_name = "colors-animated-12bpc-keyframes-0-2-3.avif";
  ASSERT_EQ(
      avifDecoderSetIOFile(decoder.get(), (data_path + file_name).c_str()),
      AVIF_RESULT_OK);
  ASSERT_EQ(avifDecoderParse(decoder.get()), AVIF_RESULT_OK);
  EXPECT_EQ(decoder->compressionFormat, COMPRESSION_FORMAT_AVIF);

  // The first frame is always a keyframe.
  EXPECT_TRUE(avifDecoderIsKeyframe(decoder.get(), 0));
  EXPECT_EQ(avifDecoderNearestKeyframe(decoder.get(), 0), 0);

  // The encoder may choose to use a keyframe here, even without FORCE_KEYFRAME.
  // It seems not to.
  EXPECT_FALSE(avifDecoderIsKeyframe(decoder.get(), 1));
  EXPECT_EQ(avifDecoderNearestKeyframe(decoder.get(), 1), 0);

  EXPECT_TRUE(avifDecoderIsKeyframe(decoder.get(), 2));
  EXPECT_EQ(avifDecoderNearestKeyframe(decoder.get(), 2), 2);

  // The encoder seems to prefer a keyframe here
  // (gradient too different from plain color).
  EXPECT_TRUE(avifDecoderIsKeyframe(decoder.get(), 3));
  EXPECT_EQ(avifDecoderNearestKeyframe(decoder.get(), 3), 3);

  // This is the same frame as the previous one. It should not be a keyframe.
  EXPECT_FALSE(avifDecoderIsKeyframe(decoder.get(), 4));
  EXPECT_EQ(avifDecoderNearestKeyframe(decoder.get(), 4), 3);
}

}  // namespace
}  // namespace avif

int main(int argc, char** argv) {
  ::testing::InitGoogleTest(&argc, argv);
  if (argc != 2) {
    std::cerr << "There must be exactly one argument containing the path to "
                 "the test data folder"
              << std::endl;
    return 1;
  }
  avif::data_path = argv[1];
  return RUN_ALL_TESTS();
}