#include "calculator.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>

#define MAX_INPUT_LENGTH 256

int main() {
    char input[MAX_INPUT_LENGTH];
    printf("=== Vedecka kalkulacka ===\n");
    printf("Podporovane operacie: + - * / ( )\n");
    printf("Funkcie: sin(), cos(), sqrt(), log()\n");
    printf("Mocnina: ^ (napr. 2^3 = 8)\n");
    printf("Pre ukoncenie napiste 'koniec'\n\n");
    while (1) {
        printf("Zadajte vyraz: ");
        if (fgets(input, sizeof(input), stdin) == NULL) {
            break;
        }
        input[strcspn(input, "\n")] = 0;
        if (strcmp(input, "koniec") == 0 || 
            strcmp(input, "exit") == 0 ||
            strcmp(input, "quit") == 0) {
            break;
        }
        if (strlen(input) == 0) {
            continue;
        }
        bool error = false;
        double result = evaluate_expression(input, &error);
        if (error || isnan(result)) {
            printf("Chyba: Neplatny vyraz!\n");
        } else {
            printf("Vysledok: %.2f\n", result);
        }
    }
    
    printf("Kalkulacka ukoncena.\n");
    return 0;
}