#include <stdio.h>
#include <stdlib.h>
#include "unity.h"
#include "numbers.h"

void test_getDuplicateReturnsDuplicateFromUnsortedArray(void)
{
    unsigned int numbers[] = {8, 3, 12, 5, 3, 20};

    TEST_ASSERT_EQUAL_UINT32(3, getDuplicate(numbers, 6));
}

void test_getDuplicateReturnsZeroForNullArray(void)
{
    TEST_ASSERT_EQUAL_UINT32(0, getDuplicate(NULL, 5));
}

void test_getDuplicateReturnsZeroIfThereIsNoDuplicate(void)
{
    unsigned int numbers[] = {1, 2, 3, 4, 5};

    TEST_ASSERT_EQUAL_UINT32(0, getDuplicate(numbers, 5));
}

void test_getDuplicateDoesNotChangeOriginalArrayOrder(void)
{
    unsigned int numbers[] = {9, 4, 7, 4, 2};
    unsigned int expectedNumbers[] = {9, 4, 7, 4, 2};

    TEST_ASSERT_EQUAL_UINT32(4, getDuplicate(numbers, 5));
    TEST_ASSERT_EQUAL_UINT32_ARRAY(expectedNumbers, numbers, 5);
}

void test_createNumbersReturnsArrayWithCorrectDuplicate(void)
{
    const unsigned int len = 20;
    unsigned int *numbers = createNumbers(len);
    unsigned int duplicate = 0;
    unsigned int duplicateCount = 0;

    TEST_ASSERT_NOT_NULL(numbers);

    duplicate = getDuplicate(numbers, len);
    TEST_ASSERT_NOT_EQUAL(0, duplicate);

    for (unsigned int i = 0; i < len; i++)
    {
        if (numbers[i] == duplicate)
        {
            duplicateCount++;
        }
    }

    TEST_ASSERT_EQUAL_UINT32(2, duplicateCount);

    free(numbers);
}

void test_createNumbersReturnsNullForTooSmallLength(void)
{
    TEST_ASSERT_NULL(createNumbers(1));
}

void setUp(void)
{
}

void tearDown(void)
{
}

int main(void)
{
    UNITY_BEGIN();

    printf("\n============================\nNumbers tests\n============================\n");
    RUN_TEST(test_getDuplicateReturnsDuplicateFromUnsortedArray);
    RUN_TEST(test_getDuplicateReturnsZeroForNullArray);
    RUN_TEST(test_getDuplicateReturnsZeroIfThereIsNoDuplicate);
    RUN_TEST(test_getDuplicateDoesNotChangeOriginalArrayOrder);
    RUN_TEST(test_createNumbersReturnsArrayWithCorrectDuplicate);
    RUN_TEST(test_createNumbersReturnsNullForTooSmallLength);

    return UNITY_END();
}