#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <setjmp.h>
#include <cmocka.h>

#include "utils.h"

static void pass_any_null_param__returns_null() {

  char DUMMY[] = "DUMMY";

  assert_null(searchandreplace(NULL,DUMMY,DUMMY));
  assert_null(searchandreplace(DUMMY,NULL,DUMMY));
  assert_null(searchandreplace(DUMMY,DUMMY,NULL));
}

static void pass_any_empty_string__returns_null() {

  char DUMMY[] = "DUMMY";
  char EMPTY[] = "";

  assert_null(searchandreplace(EMPTY,DUMMY,DUMMY));
  assert_null(searchandreplace(DUMMY,EMPTY,DUMMY));
  assert_null(searchandreplace(DUMMY,DUMMY,EMPTY));
}

static void replace_single_char__one_time__match_is_replaced() {
  char *replaced = searchandreplace("X","X","Y");

  assert_non_null(replaced);
  assert_string_equal("Y", replaced);

  free(replaced);
}

static void replace_single_char__multiple_times__match_all_matches_are_replaced() {
  char *replaced = searchandreplace("XaX","X","Y");

  assert_non_null(replaced);
  assert_string_equal ("YaY", replaced);

  free(replaced);
}

static void replace_longer_text__multiple_times__match_all_matches_are_replaced() {
  char *replaced = searchandreplace("XXaXX","XX","YY");

  assert_non_null(replaced);
  assert_string_equal ("YYaYY", replaced);

  free(replaced);
}

static void pattern_not_found__returns_original() {
  char *replaced = searchandreplace("abc","X","Y");

  assert_non_null(replaced);
  assert_string_equal ("abc", replaced);

  free(replaced);
}


int main(void) {
    const struct CMUnitTest tests[] = {
        cmocka_unit_test(pass_any_null_param__returns_null),
        cmocka_unit_test(pass_any_empty_string__returns_null),
        cmocka_unit_test(replace_single_char__one_time__match_is_replaced),
        cmocka_unit_test(replace_single_char__multiple_times__match_all_matches_are_replaced),
        cmocka_unit_test(replace_longer_text__multiple_times__match_all_matches_are_replaced),
        cmocka_unit_test(pattern_not_found__returns_original),
    };

    return cmocka_run_group_tests_name("searchandreplace", tests, NULL, NULL);
}