#include <iostream>
#include "RpnCalculator.h"

using namespace std;

void input();

int main(void) {

    cout << endl << "Reverse Polish Notation Calculator." << endl << endl <<
        "Please enter some values to compute followed by the return key or press Q to quit." << endl;
    input();
    cout << "Goodbye.";
    return 0;
}


void input() {
    RpnCalculator *c = new RpnCalculator();
    int i_value = 0;
    char input = '\0';
    bool play = true;

    cout << "(Acceptable operators: + - * /)" << endl;
    do {
        cout << " --> ";
        // Takes a value from the user and assigns it to 'input'.
        cin.sync();
        input = cin.get();
        /* Checking that input.
        *   If it's an operator it performs the operation and prints the result.
        *   If it's a numerical value, the char is cast to an int and passed to the _operands vector using push().
        */
        switch (input) {
        case '+' :
            c->add();
            cout << endl << " Result: " << c->answer() << endl;
            break;
        case '-' :
            c->subtract();
            cout << endl << " Result: " << c->answer() << endl;
            break;
        case '*' :
            c->multiply();
            cout << endl << " Result: " << c->answer() << endl;
            break;
        case '/' :
            c->divide();
            cout << endl << " Result: " << c->answer() << endl;
            break;
        case '0' :
        case '1' :
        case '2' :
        case '3' :
        case '4' :
        case '5' :
        case '6' :
        case '7' :
        case '8' :
        case '9' :
            cout << input << endl;
            i_value = static_cast<int>(input);
            c->push(i_value);
        case 'q' :
        case 'Q' :
            play = false;
            break;
        default :
            cout << " Please enter an operator, a number, or Q to quit " <<endl;
            break;
        }
    } while (play);
    delete c;
}