// Copyright 2020-2021 David Robillard <d@drobilla.net>
// SPDX-License-Identifier: ISC

#undef NDEBUG

#include "zix/digest.h"

#include <assert.h>
#include <stddef.h>

// Just basic smoke tests to ensure the hash functions are reacting to data

static void
test_digest(void)
{
  static const uint8_t data[] = {
    1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16};

  size_t last = 0u;

  for (size_t offset = 0; offset < 7; ++offset) {
    const size_t len = 8u - offset;
    for (size_t i = offset; i < 8; ++i) {
      const size_t h = zix_digest(0u, &data[i], len);
      assert(h != last);
      last = h;
    }
  }
}

static void
test_digest32(void)
{
  static const uint8_t data[] = {1, 2, 3, 4, 5, 6, 7, 8};

  uint32_t last = 0u;

  for (size_t offset = 0; offset < 3; ++offset) {
    for (size_t i = offset; i < 4; ++i) {
      const uint32_t h = zix_digest32(0u, &data[i], 4);
      assert(h != last);
      last = h;
    }
  }
}

static void
test_digest64(void)
{
  static const uint8_t data[] = {
    1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16};

  uint64_t last = 0u;

  for (size_t offset = 0; offset < 7; ++offset) {
    for (size_t i = offset; i < 8; ++i) {
      const uint64_t h = zix_digest64(0u, &data[i], 8);
      assert(h != last);
      last = h;
    }
  }
}

static void
test_digest32_aligned(void)
{
  static const uint32_t data[] = {1, 2, 3, 4, 5, 6, 7, 8};

  uint32_t last = 0u;

  for (size_t offset = 0; offset < 3; ++offset) {
    const size_t len = 4u - offset;
    for (size_t i = offset; i < 4; ++i) {
      const uint32_t h =
        zix_digest32_aligned(0u, &data[i], len * sizeof(uint32_t));
      assert(h != last);
      last = h;
    }
  }
}

static void
test_digest64_aligned(void)
{
  static const uint64_t data[] = {1, 2, 3, 4, 5, 6, 7, 8};

  uint64_t last = 0u;

  for (size_t offset = 0; offset < 3; ++offset) {
    const size_t len = 4u - offset;
    for (size_t i = offset; i < 4; ++i) {
      const uint64_t h =
        zix_digest64_aligned(0u, &data[i], len * sizeof(uint64_t));
      assert(h != last);
      last = h;
    }
  }
}

static void
test_digest_aligned(void)
{
  static const size_t data[] = {1, 2, 3, 4, 5, 6, 7, 8};

  size_t last = 0u;

  for (size_t offset = 0; offset < 3; ++offset) {
    const size_t len = 4u - offset;
    for (size_t i = offset; i < 4; ++i) {
      const size_t h = zix_digest_aligned(0u, &data[i], len * sizeof(size_t));
      assert(h != last);
      last = h;
    }
  }
}

ZIX_PURE_FUNC int
main(void)
{
  test_digest32();
  test_digest64();
  test_digest();

  test_digest32_aligned();
  test_digest64_aligned();
  test_digest_aligned();

  return 0;
}