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

int main(void)
{
    printf("=== TEST: createNumbers & getDuplicate ===\n");

    unsigned int len = 20;
    unsigned int *arr = createNumbers(len);

    if (!arr)
    {
        printf("FAILED: createNumbers returned NULL\n");
        return 1;
    }

    printf("Array created: ");
    for (unsigned int i = 0; i < len; i++)
        printf("%u ", arr[i]);
    printf("\n");

    unsigned int dup = getDuplicate(arr, len);

    if (dup == 0)
    {
        printf("FAILED: getDuplicate returned 0 (no duplicate found)\n");
        free(arr);
        return 1;
    }

    // Count occurrences manually as safety check
    unsigned int count = 0;
    for (unsigned int i = 0; i < len; i++)
        if (arr[i] == dup)
            count++;

    if (count != 2)
    {
        printf("FAILED: duplicate=%u occurs %u times (expected 2)\n", dup, count);
        free(arr);
        return 1;
    }

    printf("SUCCESS: duplicate number is %u and appears exactly twice.\n", dup);

    free(arr);
    return 0;
}