#include "simdutf.h"

#include <array>

#include <tests/helpers/transcode_test_base.h>
#include <tests/helpers/random_int.h>
#include <tests/helpers/test.h>

namespace {
constexpr std::array<size_t, 7> input_size{7, 16, 12, 64, 67, 128, 256};
constexpr simdutf::endianness LE = simdutf::endianness::LITTLE;

using simdutf::tests::helpers::transcode_utf32_to_utf16_test_base;

constexpr int trials = 1000;
} // namespace

TEST_LOOP(trials, convert_into_2_UTF16_bytes) {
  // range for 2 UTF-16 bytes
  simdutf::tests::helpers::RandomIntRanges random(
      {{0x0000, 0xd7ff}, {0xe000, 0xffff}}, seed);

  auto procedure = [&implementation](const char32_t *utf32, size_t size,
                                     char16_t *utf16) -> size_t {
    return implementation.convert_utf32_to_utf16le(utf32, size, utf16);
  };
  auto size_procedure = [&implementation](const char32_t *utf32,
                                          size_t size) -> size_t {
    return implementation.utf16_length_from_utf32(utf32, size);
  };
  for (size_t size : input_size) {
    transcode_utf32_to_utf16_test_base test(LE, random, size);
    ASSERT_TRUE(test(procedure));
    ASSERT_TRUE(test.check_size(size_procedure));
  }
}

TEST_LOOP(trials, convert_into_4_UTF16_bytes) {
  // range for 4 UTF-16 bytes
  simdutf::tests::helpers::RandomIntRanges random({{0x10000, 0x10ffff}}, seed);

  auto procedure = [&implementation](const char32_t *utf32, size_t size,
                                     char16_t *utf16) -> size_t {
    return implementation.convert_utf32_to_utf16le(utf32, size, utf16);
  };
  auto size_procedure = [&implementation](const char32_t *utf32,
                                          size_t size) -> size_t {
    return implementation.utf16_length_from_utf32(utf32, size);
  };
  for (size_t size : input_size) {
    transcode_utf32_to_utf16_test_base test(LE, random, size);
    ASSERT_TRUE(test(procedure));
    ASSERT_TRUE(test.check_size(size_procedure));
  }
}

TEST_LOOP(trials, convert_into_2_or_4_UTF16_bytes) {
  // range for 2 or 4 UTF-16 bytes (all codepoints)
  simdutf::tests::helpers::RandomIntRanges random(
      {{0x0000, 0xd7ff}, {0xe000, 0xffff}, {0x10000, 0x10ffff}}, seed);

  auto procedure = [&implementation](const char32_t *utf32, size_t size,
                                     char16_t *utf16) -> size_t {
    return implementation.convert_utf32_to_utf16le(utf32, size, utf16);
  };
  auto size_procedure = [&implementation](const char32_t *utf32,
                                          size_t size) -> size_t {
    return implementation.utf16_length_from_utf32(utf32, size);
  };
  for (size_t size : input_size) {
    transcode_utf32_to_utf16_test_base test(LE, random, size);
    ASSERT_TRUE(test(procedure));
    ASSERT_TRUE(test.check_size(size_procedure));
  }
}

TEST(convert_fails_if_there_is_surrogate) {
  auto procedure = [&implementation](const char32_t *utf32, size_t size,
                                     char16_t *utf16) -> size_t {
    return implementation.convert_utf32_to_utf16le(utf32, size, utf16);
  };
  const size_t size = 64;
  transcode_utf32_to_utf16_test_base test(LE, []() { return '*'; }, size + 32);

  for (char32_t surrogate = 0xd800; surrogate <= 0xdfff; surrogate++) {
    for (size_t i = 0; i < size; i++) {
      const auto old = test.input_utf32[i];
      test.input_utf32[i] = surrogate;
      ASSERT_TRUE(test(procedure));
      test.input_utf32[i] = old;
    }
  }
}

TEST(convert_fails_if_input_too_large) {
  uint32_t seed{1234};
  simdutf::tests::helpers::RandomInt generator(0x110000, 0xffffffff, seed);

  auto procedure = [&implementation](const char32_t *utf32, size_t size,
                                     char16_t *utf16) -> size_t {
    return implementation.convert_utf32_to_utf16le(utf32, size, utf16);
  };
  const size_t size = 64;
  transcode_utf32_to_utf16_test_base test(LE, []() { return '*'; }, size + 32);

  for (size_t j = 0; j < 1000; j++) {
    uint32_t wrong_value = generator();
    for (size_t i = 0; i < size; i++) {
      auto old = test.input_utf32[i];
      test.input_utf32[i] = wrong_value;
      ASSERT_TRUE(test(procedure));
      test.input_utf32[i] = old;
    }
  }
}

TEST_MAIN