#include <iostream>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <time.h>
#include <sys/wait.h>
#include <unistd.h>


const int k = 10;
const int N = 5;
int sumOfTerms = 0;

int fillArray(int *arr){
    for (int i = 0;i<k;i++){
        arr[i] = rand()%20;
    }
}

void printArray(int *arr){
    for(int i=0;i<k;i++){
//        printf("%d ",arr[i]);

    }
}

int findMax(int *arr){
    int max=arr[0];
    for(int i = 0; i<k;i++){
        if(max<arr[i]){
            max = arr[i];
        }
    }
    return max;
}
int fillSeriesArray(int *arr, int size){
    arr[0] = 12;
    arr[1] = -8;
    arr[2] =  6;

    for(int i=3;i<size;i++){
        arr[i] = -8 * arr[i-1] - sqrt(2/3 * arr[i-2]) + 13 * arr[i-3];
    }

}



int main(){

    srand(time(NULL));
    int max;
    int *randomNumbers = (int*)malloc(sizeof(int)* k);


    fillArray(randomNumbers);
    printArray(randomNumbers);

    max = findMax(randomNumbers);
    int* seriesArray=(int*)malloc(max*sizeof(int));
    fillSeriesArray(seriesArray,max);
    printArray(seriesArray);

    int input[2], output[2];
    pipe(input);
    pipe(output);
    int i = 0;


    // proces nadrzedny wysyla liczbe z tablicy do obliczenia
    for(i =0;i< k;i++){
        write(input[1],&randomNumbers[i],sizeof(randomNumbers[i]));
    }

    for(i = 0;i<N;i++){
        if(fork() == 0){

            while(1){
                int  term = 0;
                read(input[0],&term, sizeof(term));
                if(term<0)
                    exit(0);

                int result = seriesArray[term];
                write(output[1],&result,sizeof(result));
            }
        }
    }

    //
    for(i = 0; i<N;i++){
        int result = 0;
        read(output[0],&result,sizeof(result));
        sumOfTerms+=result;
    }

    for(i = 0; i<N;i++){
        int terminate = -1;
        write(input[1],&terminate,sizeof(terminate));
    }

    printf("Suma wszystkich wyrazów wynosi: %d",sumOfTerms);
    return 0;
}