#include "vendor/unity.h"
#include "../src/largest_series_product.h"

void test_can_find_the_largest_product_of_2_with_numbers_in_order(void)
{
   TEST_ASSERT_EQUAL(72, largest_series_product("0123456789", 2));
}

void test_can_find_the_largest_product_of_2(void)
{
   TEST_ASSERT_EQUAL(48, largest_series_product("576802143", 2));
}

void test_finds_the_largest_product_if_span_equals_length(void)
{
   TEST_ASSERT_EQUAL(18, largest_series_product("29", 2));
}

void test_can_find_the_largest_product_of_3_with_numbers_in_order(void)
{
   TEST_ASSERT_EQUAL(504, largest_series_product("0123456789", 3));
}

void test_can_find_the_largest_product_of_3(void)
{
   TEST_ASSERT_EQUAL(270, largest_series_product("1027839564", 3));
}

void test_can_find_the_largest_product_of_5_with_numbers_in_order(void)
{
   TEST_ASSERT_EQUAL(15120, largest_series_product("0123456789", 5));
}

void test_can_get_the_largest_product_of_a_big_number(void)
{
   TEST_ASSERT_EQUAL(23520,
                     largest_series_product
                     ("73167176531330624919225119674426574742355349194934", 6));
}

void test_can_get_the_largest_product_of_a_big_number_ii(void)
{
   TEST_ASSERT_EQUAL(28350,
                     largest_series_product
                     ("52677741234314237566414902593461595376319419139427", 6));
}

void test_can_get_the_largest_product_of_a_big_number_project_euler(void)
{
   TEST_ASSERT_EQUAL_INT64(23514624000,
                           largest_series_product
                           ("7316717653133062491922511967442657474235534919493496983520312774506326239578318016984801869478851843858615607891129494954595017379583319528532088055111254069874715852386305071569329096329522744304355766896648950445244523161731856403098711121722383113622298934233803081353362766142828064444866452387493035890729629049156044077239071381051585930796086670172427121883998797908792274921901699720888093776657273330010533678812202354218097512545405947522435258490771167055601360483958644670632441572215539753697817977846174064955149290862569321978468622482839722413756570560574902614079729686524145351004748216637048440319989000889524345065854122758866688116427171479924442928230863465674813919123162824586178664583591245665294765456828489128831426076900422421902267105562632111110937054421750694165896040807198403850962455444362981230987879927244284909188845801561660979191338754992005240636899125607176060588611646710940507754100225698315520005593572972571636269561882670428252483600823257530420752963450",
                            13));
}

void test_reports_zero_if_the_only_digits_are_zero(void)
{
   TEST_ASSERT_EQUAL(0, largest_series_product("0000", 2));
}

void test_reports_zero_if_all_spans_include_zero(void)
{
   TEST_ASSERT_EQUAL(0, largest_series_product("99099", 3));
}

void test_rejects_span_longer_than_string_length(void)
{
   TEST_ASSERT_EQUAL(-1, largest_series_product("123", 4));
}

void test_reports_1_for_empty_string_and_empty_product_(void)
{
   TEST_ASSERT_EQUAL(1, largest_series_product("", 0));
}

void test_reports_1_for_nonempty_string_and_empty_product_(void)
{
   TEST_ASSERT_EQUAL(1, largest_series_product("123", 0));
}

void test_rejects_empty_string_and_nonzero_span(void)
{
   TEST_ASSERT_EQUAL(-1, largest_series_product("", 1));
}

void test_rejects_invalid_character_in_digits(void)
{
   TEST_ASSERT_EQUAL(-1, largest_series_product("123a5", 2));
}

int main(void)
{
   UnityBegin("largest_series_product.c");

   RUN_TEST(test_can_find_the_largest_product_of_2_with_numbers_in_order);
   RUN_TEST(test_can_find_the_largest_product_of_2);
   RUN_TEST(test_finds_the_largest_product_if_span_equals_length);
   RUN_TEST(test_can_find_the_largest_product_of_3_with_numbers_in_order);
   RUN_TEST(test_can_find_the_largest_product_of_3);
   RUN_TEST(test_can_find_the_largest_product_of_5_with_numbers_in_order);
   RUN_TEST(test_can_get_the_largest_product_of_a_big_number);
   RUN_TEST(test_can_get_the_largest_product_of_a_big_number_ii);
   RUN_TEST(test_can_get_the_largest_product_of_a_big_number_project_euler);
   RUN_TEST(test_reports_zero_if_the_only_digits_are_zero);
   RUN_TEST(test_reports_zero_if_all_spans_include_zero);
   RUN_TEST(test_rejects_span_longer_than_string_length);
   RUN_TEST(test_reports_1_for_empty_string_and_empty_product_);
   RUN_TEST(test_reports_1_for_nonempty_string_and_empty_product_);
   RUN_TEST(test_rejects_empty_string_and_nonzero_span);
   RUN_TEST(test_rejects_invalid_character_in_digits);

   UnityEnd();
   return 0;
}