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

#define MAX_NIZ 30
#define MAX_IME 20+1

struct prevoznik_st{
    char operater[MAX_IME];
    double cena_karte;
    double maksimalna_masa;
    double doplata;
};

struct cena_st{
    double ukupna_cena;
    char operater[MAX_IME];
};


FILE *safe_fopen(char in_filename[], char mode[], int error_code);
void ucitaj_fajl(FILE *in, struct prevoznik_st prevoznici[], int *n);
void transform(struct prevoznik_st revoznici[], struct cena_st cene[], int n, double masa,struct cena_st temp[]);
double racunaj_cenu(double masa,struct prevoznik_st prevoznici);
void cuvaj_fajl(FILE *out,struct cena_st cene[], int n);

int main(int arg_num, char **args){
   if(arg_num!=4){
    printf("Uneli ste pogresnu komandu da startate program!");
    exit(404);
   }

double masa = atof(args[1]);
char *in_filename=args[2];
char *out_filename=args[3];

FILE *in= safe_fopen(in_filename, "r", 2);
FILE *out= safe_fopen(out_filename, "w", 3);

struct prevoznik_st prevoznici[MAX_NIZ];
struct cena_st cene[MAX_NIZ];
struct cena_st tempst[MAX_NIZ];
int n;

ucitaj_fajl(in, prevoznici, &n);
transform(prevoznici, cene, n, masa,tempst);

cuvaj_fajl(out, cene, n);

fclose(in);
fclose(out);
return 0;
}

FILE *safe_fopen(char filename[], char mode[], int error_code){

FILE *fp=fopen(filename,mode);
if (fp==NULL){
        printf("Can't open '%s'!\n", filename);
        exit(error_code);
}
return fp;
}



void ucitaj_fajl(FILE *in, struct prevoznik_st prevoznici[], int *n){

(*n)=0;

while(fscanf(in, "%s %lf %lf %lf",
    prevoznici[*n].operater,
    &prevoznici[*n].cena_karte,
    &prevoznici[*n].maksimalna_masa,
    &prevoznici[*n].doplata)!=EOF){
    (*n)++;
    }
}


void transform(struct prevoznik_st prevoznici[], struct cena_st cene[], int n, double masa,struct cena_st tempst[]){

int i;
for(i=0;i<n;i++){
    strcpy(cene[i].operater,prevoznici[i].operater);
    cene[i].ukupna_cena=racunaj_cenu(masa,prevoznici[i]);

}

//sortiranje moze i drugoj funkciji
for(i=0;i<(n-1);i++){
    for(j=0;j<(n-i-1);j++){
    if(cene[j].ukupna_cena>cene[j+1].ukupna_cena){

    tempst[i]=cene[j];
    cene[j]=cene[j+1];
    cene[j+1]=tempst[i];

    }
    }
}
}

double racunaj_cenu(double masa,struct prevoznik_st prevoznici){
    double maks=prevoznici.maksimalna_masa;
    double cena=prevoznici.cena_karte;
    double doplata=prevoznici.doplata;
    double suma;

    if (maks<masa)
    suma=cena+((masa-maks)*doplata);
     else
    suma=cena;

return suma;

}


void cuvaj_fajl(FILE *out,struct cena_st cene[], int n){

int i;
for(i=0;i<n;i++){

fprintf(out, "%7.2f %s \n",
    cene[i].ukupna_cena,
    cene[i].operater);

}}