// Copyright 2011-2020 David Robillard <d@drobilla.net>
// SPDX-License-Identifier: ISC

#undef NDEBUG

#include "serd/serd.h"

#include <assert.h>
#include <float.h>
#include <math.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#ifndef INFINITY
#  define INFINITY (DBL_MAX + DBL_MAX)
#endif
#ifndef NAN
#  define NAN (INFINITY - INFINITY)
#endif

static void
test_strtod(double dbl, double max_delta)
{
  char buf[1024];
  snprintf(buf, sizeof(buf), "%f", dbl);

  char*        endptr = NULL;
  const double out    = serd_strtod(buf, &endptr);
  const double diff   = fabs(out - dbl);

  assert(diff <= max_delta);
}

static void
test_string_to_double(void)
{
  const double expt_test_nums[] = {
    2.0E18, -5e19, +8e20, 2e+22, -5e-5, 8e0, 9e-0, 2e+0};

  const char* expt_test_strs[] = {
    "02e18", "-5e019", "+8e20", "2E+22", "-5E-5", "8E0", "9e-0", " 2e+0"};

  for (size_t i = 0; i < sizeof(expt_test_nums) / sizeof(double); ++i) {
    const double num   = serd_strtod(expt_test_strs[i], NULL);
    const double delta = fabs(num - expt_test_nums[i]);
    assert(delta <= DBL_EPSILON);

    test_strtod(expt_test_nums[i], DBL_EPSILON);
  }
}

static void
test_double_to_node(void)
{
  const double dbl_test_nums[] = {0.0,
                                  9.0,
                                  10.0,
                                  .01,
                                  2.05,
                                  -16.00001,
                                  5.000000005,
                                  0.0000000001,
                                  NAN,
                                  INFINITY};

  const char* dbl_test_strs[] = {"0.0",
                                 "9.0",
                                 "10.0",
                                 "0.01",
                                 "2.05",
                                 "-16.00001",
                                 "5.00000001",
                                 "0.0",
                                 NULL,
                                 NULL};

  for (size_t i = 0; i < sizeof(dbl_test_nums) / sizeof(double); ++i) {
    SerdNode   node = serd_node_new_decimal(dbl_test_nums[i], 8);
    const bool pass = (node.buf && dbl_test_strs[i])
                        ? !strcmp(node.buf, dbl_test_strs[i])
                        : (node.buf == dbl_test_strs[i]);
    assert(pass);
    const size_t len = node.buf ? strlen(node.buf) : 0;
    assert(node.n_bytes == len);
    serd_node_free(&node);
  }
}

static void
test_integer_to_node(void)
{
#define N_TEST_NUMS 7U

  const long int_test_nums[N_TEST_NUMS] = {0, -0, -23, 23, -12340, 1000, -1000};

  const char* int_test_strs[N_TEST_NUMS] = {
    "0", "0", "-23", "23", "-12340", "1000", "-1000"};

  for (size_t i = 0; i < N_TEST_NUMS; ++i) {
    SerdNode node = serd_node_new_integer(int_test_nums[i]);
    assert(!strcmp(node.buf, int_test_strs[i]));
    assert(node.n_bytes == strlen(node.buf));
    serd_node_free(&node);
  }

#undef N_TEST_NUMS
}

static void
test_blob_to_node(void)
{
  for (size_t size = 1; size < 256; ++size) {
    uint8_t* const data = (uint8_t*)malloc(size);
    for (size_t i = 0; i < size; ++i) {
      data[i] = (uint8_t)((size + i) % 256);
    }

    SerdNode blob = serd_node_new_blob(data, size, size % 5);

    assert(blob.n_bytes == strlen(blob.buf));

    size_t   out_size = 0;
    uint8_t* out =
      (uint8_t*)serd_base64_decode(blob.buf, blob.n_bytes, &out_size);
    assert(out_size == size);

    for (size_t i = 0; i < size; ++i) {
      assert(out[i] == data[i]);
    }

    serd_node_free(&blob);
    serd_free(out);
    free(data);
  }
}

static void
test_node_equals(void)
{
  const uint8_t replacement_char_str[] = {0xEF, 0xBF, 0xBD, 0};
  SerdNode      lhs =
    serd_node_from_string(SERD_LITERAL, (const char*)replacement_char_str);
  SerdNode rhs = serd_node_from_string(SERD_LITERAL, "123");
  assert(!serd_node_equals(&lhs, &rhs));

  SerdNode qnode = serd_node_from_string(SERD_CURIE, "foo:bar");
  assert(!serd_node_equals(&lhs, &qnode));
  assert(serd_node_equals(&lhs, &lhs));

  SerdNode null_copy = serd_node_copy(&SERD_NODE_NULL);
  assert(serd_node_equals(&SERD_NODE_NULL, &null_copy));
}

static void
test_node_from_string(void)
{
  SerdNode node = serd_node_from_string(SERD_LITERAL, "hello\"");
  assert(node.n_bytes == 6 && node.flags == SERD_HAS_QUOTE &&
         !strcmp(node.buf, "hello\""));

  assert(node.n_bytes == 6 && node.flags == SERD_HAS_QUOTE &&
         !strcmp((const char*)node.buf, "hello\""));

  node = serd_node_from_string(SERD_URI, NULL);
  assert(serd_node_equals(&node, &SERD_NODE_NULL));
}

static void
test_node_from_substring(void)
{
  SerdNode empty = serd_node_from_substring(SERD_LITERAL, NULL, 32);
  assert(!empty.buf && !empty.n_bytes && !empty.flags && !empty.type);

  SerdNode a_b = serd_node_from_substring(SERD_LITERAL, "a\"bc", 3);
  assert(a_b.n_bytes == 3 && a_b.flags == SERD_HAS_QUOTE &&
         !strncmp(a_b.buf, "a\"b", 3));

  a_b = serd_node_from_substring(SERD_LITERAL, "a\"bc", 10);
  assert(a_b.n_bytes == 4 && a_b.flags == SERD_HAS_QUOTE &&
         !strncmp(a_b.buf, "a\"bc", 4));
}

int
main(void)
{
  test_string_to_double();
  test_double_to_node();
  test_integer_to_node();
  test_blob_to_node();
  test_node_equals();
  test_node_from_string();
  test_node_from_substring();

  printf("Success\n");
  return 0;
}