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

struct elem{
    char nev[31];
    int ear;
    int db;
};

int sorok(char* fn){
    int retval = 1;
    FILE * fl = fopen(fn, "r");
    char buf;
    while(!feof(fl)){
        if(fread(&buf, sizeof(char), 1, fl) && buf == '\n')retval++;
    }
    fclose(fl);
    return retval;
}

void torol(struct elem ** praktar){
    if(*praktar != NULL){
        free(*praktar);
        *praktar = NULL;
    }
}

void foglal(struct elem ** praktar, int x){
    *praktar = (struct elem*)malloc(sizeof(struct elem)*x);
}

int beolvas(struct elem ** praktar){
    torol(praktar);
    char fn[65];
    printf("File neve: ");
    scanf("%s", fn);
    int sr = sorok(fn);
    foglal(praktar, sr);
    FILE * fl = fopen(fn, "r");
    int idxA;
    for(idxA = 0; idxA < sr; idxA++){
        fscanf(fl, "%s", (*praktar+idxA)->nev);
        fscanf(fl, "%d", &(*praktar+idxA)->ear);
        fscanf(fl, "%d", &(*praktar+idxA)->db);
    }
    fclose(fl);
    return sr;
}

void kiir(struct elem * raktar, int sorok){
    if(raktar == NULL){
            printf("Nincs mit kiirni, a lista üres...");
        } else {
        int idxA;
        printf("A lista:\n");
        for(idxA = 0; idxA < sorok; idxA++){
            printf("Nev: %s - E.ar: %d - Darab: %d\n", (raktar+idxA)->nev, (raktar+idxA)->ear, (raktar+idxA)->db);
        }
    }
}

void keres(struct elem * raktar, int sr){
    if(raktar == NULL){
        printf("Nincs mit keresni, a lista üres...");
        return;
    }
    char nev[31];
    printf("Mire szeretnel rakeresni?");
    scanf("%s", nev);

    int idxA;
    for(idxA = 0; idxA < sr && strcmp(nev, raktar[idxA].nev); idxA++);
    if(idxA == sr){
        printf("Nincs ilyen...\n");
    } else {
        printf("Nev: %s - E.ar: %d - Darab: %d\n", (raktar+idxA)->nev, (raktar+idxA)->ear, (raktar+idxA)->db);
    }
    //printf("%d", strcmp(nev, raktar[idxA].nev));

}

int minput(){
    printf("Valassz a menupontok kozul:\n");
    printf("1. Lista betoltese\n2. Kereses\n3. Listazas\n4. Kilepes");
    int o=-1;
    scanf("%d", &o);
    return o;
}

int main(void) {
    setbuf(stdout, 0);
    struct elem * raktar = NULL;
    int sr = -1;
    int o = -1;
    while(o != 4){
        switch((o = minput())){
            case 1:
                sr = beolvas(&raktar);
            break;
            case 2:
                keres(raktar, sr);
            break;
            case 3:
                kiir(raktar, sr);
            break;
            case 4:
                torol(&raktar);
                printf("A program kilep... A memoria fellelegzik\n");
            break;
            default:
                printf("Hibas bemenet!\n");
            break;
        }
    }

    return EXIT_SUCCESS;
}