#include "../../unity/unity.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>

/* Unity required hooks */
void setUp(void) {
  /* Setup code here, or leave empty */
}
void tearDown(void) {
  /* Cleanup code here, or leave empty */
}

/* The following helpers and the target function `null` are defined in the
   included program source (this test file is included into expr.c),
   so we can call them directly:
     - VALUE struct and TYPE enum
     - int_value, str_value, freev
     - toarith
     - null
*/

/* Integer cases */

static void test_null_integer_zero_true(void) {
  VALUE *v = int_value(0);
  TEST_ASSERT_TRUE(null(v));
  freev(v);
}

static void test_null_integer_one_false(void) {
  VALUE *v = int_value(1);
  TEST_ASSERT_FALSE(null(v));
  freev(v);
}

static void test_null_integer_negative_false(void) {
  VALUE *v = str_value("-1");
  TEST_ASSERT_TRUE(toarith(v));
  TEST_ASSERT_FALSE(null(v));
  freev(v);
}

static void test_null_integer_negative_zero_true(void) {
  VALUE *v = str_value("-0");
  TEST_ASSERT_TRUE(toarith(v));
  TEST_ASSERT_TRUE(null(v));
  freev(v);
}

static void test_null_integer_large_nonzero_false(void) {
  VALUE *v = str_value("123456789012345678901234567890");
  TEST_ASSERT_TRUE(toarith(v));
  TEST_ASSERT_FALSE(null(v));
  freev(v);
}

/* String cases */

static void test_null_string_empty_true(void) {
  VALUE *v = str_value("");
  TEST_ASSERT_TRUE(null(v));
  freev(v);
}

static void test_null_string_zero_true(void) {
  VALUE *v = str_value("0");
  TEST_ASSERT_TRUE(null(v));
  freev(v);
}

static void test_null_string_many_zeros_true(void) {
  VALUE *v = str_value("000000");
  TEST_ASSERT_TRUE(null(v));
  freev(v);
}

static void test_null_string_minus_zeros_true(void) {
  VALUE *v = str_value("-00000");
  TEST_ASSERT_TRUE(null(v));
  freev(v);
}

static void test_null_string_single_minus_false(void) {
  VALUE *v = str_value("-");
  TEST_ASSERT_FALSE(null(v));
  freev(v);
}

static void test_null_string_nonzero_digit_false(void) {
  VALUE *v = str_value("1");
  TEST_ASSERT_FALSE(null(v));
  freev(v);
}

static void test_null_string_leading_zeros_then_nonzero_false(void) {
  VALUE *v = str_value("000100");
  TEST_ASSERT_FALSE(null(v));
  freev(v);
}

static void test_null_string_minus_then_nonzero_false(void) {
  VALUE *v = str_value("-10");
  TEST_ASSERT_FALSE(null(v));
  freev(v);
}

static void test_null_string_plus_zero_false(void) {
  VALUE *v = str_value("+0");
  TEST_ASSERT_FALSE(null(v));
  freev(v);
}

static void test_null_string_space_zero_false(void) {
  VALUE *v = str_value(" 0");
  TEST_ASSERT_FALSE(null(v));
  freev(v);
}

static void test_null_string_alpha_false(void) {
  VALUE *v = str_value("foo");
  TEST_ASSERT_FALSE(null(v));
  freev(v);
}

/* Main runner */
int main(void) {
  UNITY_BEGIN();

  RUN_TEST(test_null_integer_zero_true);
  RUN_TEST(test_null_integer_one_false);
  RUN_TEST(test_null_integer_negative_false);
  RUN_TEST(test_null_integer_negative_zero_true);
  RUN_TEST(test_null_integer_large_nonzero_false);

  RUN_TEST(test_null_string_empty_true);
  RUN_TEST(test_null_string_zero_true);
  RUN_TEST(test_null_string_many_zeros_true);
  RUN_TEST(test_null_string_minus_zeros_true);
  RUN_TEST(test_null_string_single_minus_false);
  RUN_TEST(test_null_string_nonzero_digit_false);
  RUN_TEST(test_null_string_leading_zeros_then_nonzero_false);
  RUN_TEST(test_null_string_minus_then_nonzero_false);
  RUN_TEST(test_null_string_plus_zero_false);
  RUN_TEST(test_null_string_space_zero_false);
  RUN_TEST(test_null_string_alpha_false);

  return UNITY_END();
}