#include "stdlib.h"
#include "stdio.h"
#include "string.h"

#define MAX_SIZE 20

struct paket_st{
    char zemlja[MAX_SIZE];
    char operater[MAX_SIZE];
    unsigned pretplata;
    unsigned KWh_pretplata;
    double cena_KWh;
};

struct cena_st{
    double uku_cena;
    char zemlja[MAX_SIZE];
    char operater[MAX_SIZE];
};


FILE *safe_fopen(char filename[], char model[], int error_code);
int unos(FILE *in,struct paket_st paket[]);
double ukupna_cena(struct paket_st paket, int KW);
void transform(struct paket_st paket[], struct cena_st cena[], int n, int KW);
void izlaz(FILE *out, struct cena_st cena[],int n);

int main(int argv, char **args){
    if(argv!=4){
        printf("Wrong input!");
        exit(42);
    }
    struct paket_st paket[MAX_SIZE];
    struct cena_st cena[MAX_SIZE];

    char *in_c=args[2];
    char *out_f=args[3];

    FILE *in=safe_fopen(in_c,"r",2);
    FILE *out=safe_fopen(out_f,"w",3);

    int n=unos(in,paket);
    int KW=atoi(args[1]);

    transform(paket,cena,n,KW);
    izlaz(out,cena,n);

    fclose(out);
    fclose(in);

    return 0;
}

FILE *safe_fopen(char filename[], char model[], int error_code){
    FILE *fp=fopen(filename,model);
    if(fp ==NULL){
        printf("Cant open file %s",filename);
        exit(error_code);
    }
    return fp;
}

int unos(FILE *in,struct paket_st paket[]){
    int n=0;
    while (fscanf(in," %s %s %u %u %lf",
            paket[n].zemlja,
            paket[n].operater,
            &paket[n].pretplata,
            &paket[n].KWh_pretplata,
            &paket[n].cena_KWh)!=EOF){
        n++;
    }
    return n;
}

double ukupna_cena(struct paket_st paket, int KW){
    double base = paket.pretplata;
    int extra_kwh= KW -paket.KWh_pretplata;
    if(extra_kwh>0){
        base+=extra_kwh*paket.cena_KWh;
    }
    return base;
}

void transform(struct paket_st paket[], struct cena_st cena[], int n, int KW){
    for (int i = 0; i <n ; i++) {
        cena[i].uku_cena=ukupna_cena(paket[i],KW);
        strcpy(cena[i].zemlja,paket[i].zemlja);
        strcpy(cena[i].operater,paket[i].operater);
    }
}

void izlaz(FILE *out, struct cena_st cena[], int n){
    for (int i = 0; i <n ; i++) {
        fprintf(out,"%7.2f %s %s\n",
                cena[i].uku_cena,
                cena[i].zemlja,
                cena[i].operater);
    }
}