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

#define MAX_RESTORAN (10 + 1)
#define MAX_KUHINJA (20 + 1)

typedef struct restoran_st{
    char restoran[MAX_RESTORAN];
    char kuhinja[MAX_KUHINJA];
    float ocena;
    struct restoran_st *sl;
}RESTORAN;

void list_init(RESTORAN**);
void delete_list(RESTORAN**);
RESTORAN* make_restoran(char*,char*,float);
void add_to_list(RESTORAN**,RESTORAN*);

FILE* safe_open(char*,char*);
void load(FILE*,RESTORAN**);
void save(FILE*,RESTORAN*,char*);

int main(int argc, char** argv){
    if(argc != 4){
        printf("Nepravilan poziv programa.");
        return EXIT_FAILURE;
    }else{
        RESTORAN* glava;
        FILE* file = safe_open(argv[2],"r");
        list_init(&glava);
        load(file,&glava);
        fclose(file);
        file = safe_open(argv[3],"w");
        save(file,glava,argv[1]);
        fclose(file);
        delete_list(&glava);
        return EXIT_SUCCESS;
    }
}

void list_init(RESTORAN** glava){
    *glava = NULL;
    return;
}

void delete_list(RESTORAN** glava){
    RESTORAN* t;
    while(*glava != NULL){
        t = *glava;
        *glava = (*glava)->sl;
        free(*glava);
    }
    return;
}

RESTORAN* make_restoran(char* restoran,char* kuhinja,float ocena){
    RESTORAN* new = (RESTORAN*)malloc(sizeof(RESTORAN));
    if(new == NULL){
        printf("Nije moguce zauzeti memoriju.");
        exit(EXIT_FAILURE);
    }
    strcpy(new->restoran,restoran);
    strcpy(new->kuhinja,kuhinja);
    new->ocena = ocena;
    new->sl = NULL;
    return new;
}

void add_to_list(RESTORAN** glava,RESTORAN* new){
    if(*glava == NULL){
        *glava = new;
    }else{
        RESTORAN* t = *glava;
        while(t->sl != NULL){
            t = t->sl;
        }
        t->sl = new;
    }
    return;
}

FILE* safe_open(char* name,char* mode){
    FILE* f = fopen(name,mode);
    if(f == NULL){
        printf("Nije moguce otvoriti fajl %s.",name);
        exit(EXIT_FAILURE);
    }
    return f;
}

void load(FILE* f,RESTORAN** glava){
    char restoran[MAX_RESTORAN],
         kuhinja[MAX_KUHINJA];
    float ocena;
    while(fscanf(f,"%s %s %f",
                             restoran,
                             kuhinja,
                             &ocena) != EOF){
        add_to_list(glava,make_restoran(restoran,kuhinja,ocena));
    }
    return;
}

void save(FILE* f,RESTORAN* glava,char* param){
    RESTORAN* t   = glava,
            * max = NULL;
    while(t != NULL){
        fprintf(f,"%3.1f %-10s %s\n",
                                  t->ocena,
                                  t->restoran,
                                  t->kuhinja);
        if(strcmp(t->kuhinja,param) == 0){
            if(max == NULL){
                max = t;
            }else{
                if(max->ocena < t->ocena){
                    max = t;
                }
            }
        }
        t = t->sl;
    }
    if(max == NULL){
        fprintf(f,"\nU gradu ne postoji %s restoran.",param);
    }else{
        fprintf(f,"\nNajbolje ocenjen %s restoran u gradu je:\n%3.1f %-10s %s",param,max->ocena,max->restoran,max->kuhinja);
    }
    return;
}