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

// arbitrary buffer size for reading file input
#define BUFSIZE 1000

int find_array_maxes(int *input_array, int size){
    int max = 0;
    for(int i=0; i < size; i++){
        if(max < *input_array){
            max = *input_array;
        }
        input_array++;
    }
    return max;
}

int main(int argc, char *argv[]){
    // check to ensure there are sufficient command line arguments
    if(argc <= 2){
        printf("At least two arguments are required!\n");
        exit(1);
    } else if(atoi(argv[1]) < 1){
        printf("You must create an array of at least 1 element!\n");
        exit(1);
    }

    // allocates memory for array that will store file values
    int array_size = atoi(argv[1]);
    int *array_ptr = (int*) malloc(array_size * sizeof(int));

    // creates a file ptr and buffer to read file contents
    FILE *file = fopen(argv[2], "r");
    char buff[BUFSIZE];
    int converted_num;
    int counter = 0;

    // verify the array is allocated
    if(array_ptr == NULL){
        printf("Memory allocation of %d integer elements has failed.\n", array_size);
        fclose(file);
        exit(1);
    }

    // stores contents of file into the buffer and is converted from the buffer to int
    // to be stored in the dynamically allocated array
    while(fgets(buff, BUFSIZE-1, file) != NULL && counter < array_size){
        converted_num = atoi(buff);
        *array_ptr = converted_num;
        printf("%d\n", *array_ptr);
        array_ptr++;
        counter++;
    }

    array_ptr -= counter;

    fclose(file);

    int max1 = find_array_maxes(array_ptr, counter);

    for(int i=0; i<counter; i++){
        if(max1 == *array_ptr){
            *array_ptr = 0;
        }
        array_ptr++;
    }

    array_ptr -= counter;

    int max2 = find_array_maxes(array_ptr, counter);

    printf("The first max is %d and the second max is %d.\n", max1, max2);
    return 0;
}