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

int main(void)
{
    unsigned int len = 100;
    unsigned int *nums = createNumbers(len);
    if(nums == NULL) { fprintf(stderr, "createNumbers returned NULL\n"); return 1; }

    // count occurrences
    unsigned int maxVal = 2 * len;
    unsigned int *counts = calloc(maxVal + 1, sizeof(unsigned int));
    if(counts == NULL) { free(nums); return 2; }

    for(unsigned int i = 0; i < len; i++)
    {
        if(nums[i] > maxVal) { fprintf(stderr, "value out of expected range\n"); free(nums); free(counts); return 3; }
        counts[nums[i]]++;
    }

    int duplicatesFound = 0;
    unsigned int duplicateValue = 0;
    for(unsigned int v = 1; v <= maxVal; v++)
    {
        if(counts[v] == 2) { duplicatesFound++; duplicateValue = v; }
        else if(counts[v] > 2) { fprintf(stderr, "value %u appears more than twice\n", v); free(nums); free(counts); return 4; }
    }

    if(duplicatesFound != 1) { fprintf(stderr, "expected exactly one duplicated value, found %d\n", duplicatesFound); free(nums); free(counts); return 5; }

    unsigned int found = getDuplicate(nums, len);
    if(found != duplicateValue) { fprintf(stderr, "getDuplicate returned %u expected %u\n", found, duplicateValue); free(nums); free(counts); return 6; }

    free(nums);
    free(counts);

    printf("test_numbers: OK (duplicate = %u)\n", duplicateValue);
    return 0;
}