#ifndef RATIONALNUMBER_H_INCLUDED
#define RATIONALNUMBER_H_INCLUDED

#include <stdexcept>
#include <iostream>
#include <iomanip>

using namespace std;

class RationalNumber {
public:
    RationalNumber(int num, int denom)
    :numerator(num), denominator(denom){
        setNum(num);
        setDenom(denom);

        if (denom == 0) {
            throw invalid_argument("Denominator cannot be zero.");
        } else if (denom < 0) {
            throw invalid_argument("Denominator cannot be negative.");
        }

        cout << "\n" << fractionForm();
        simplify();

        cout << " simplifies to " << fractionForm() << "\n" << endl;
    }

    void setNum(int num) {
        num = numerator;
    }

    int getNum() {
        return numerator;
    }

    void setDenom(int denom) {
        denominator = denom;
    }

    int getDenom () {
        return denominator;
    }

    string simplify() {
        for (int i = denominator * numerator; i > 1; i--) {
            if (numerator == 0) {
                return "1";
            }
            if ((denominator % i == 0) && (numerator % i == 0)) {
                    denominator = denominator / i;
                    numerator = numerator / i;
                if (denominator == 1) {
                    return to_string(numerator);
                } else {
                    return to_string(numerator) + "/" + to_string(denominator);
                }
            }
         }
        //cout << numerator << "/" << denominator << endl;
     }

    string fractionForm() {
       // return to_string(num) + "/" + to_string(denom);
       //return getNum() + "/" + getDenom();
        if (numerator == 0 || (numerator == 1 && denominator == 1)) {
            return "1";
        }
        if(denominator == 1) {
            return to_string(numerator);
        } else {
            return to_string(numerator) + "/" + to_string(denominator);
        }
    }

    void operator+(RationalNumber& fraction) const{
        cout << "\n---A D D I N G   " << fraction.numerator << "/" << fraction.denominator << "   T O   " << numerator << "/" << denominator << " ---" << endl;

        if (fraction.denominator != denominator) {
            fraction.numerator = (numerator * fraction.denominator) + (fraction.numerator * denominator);
            fraction.denominator = denominator * fraction.denominator;

        } else if (fraction.denominator == denominator) {
            fraction.numerator = (numerator + fraction.numerator);
        }

        if (fraction.numerator != fraction.denominator) {
            fraction.simplify();
            cout << "   = " << fraction.fractionForm() << endl;
        } else if (fraction.numerator == fraction.denominator) {
            cout << "   = 1" << endl;
        }

    }

    void operator-(RationalNumber& fraction) const{
        cout << "\n---S U B T R A C T I N G    " << fraction.numerator << "/" << fraction.denominator << "   F R O M   " << numerator << "/" << denominator << "---" << endl;

        if (fraction.denominator != denominator) {
            fraction.numerator = (fraction.numerator * denominator);
            fraction.denominator = denominator * fraction.denominator;
            fraction.simplify();

        } else if (fraction.denominator == denominator) {
            fraction.numerator = (numerator - fraction.numerator);
        }

        if (fraction.numerator != fraction.denominator) {
            fraction.simplify();

            cout << "   = " << fraction.fractionForm() << endl;
        } else if (fraction.numerator == fraction.denominator) {
            cout << "   = 1" << endl;
        }

    }

    void operator*(RationalNumber& fraction) const{
        cout << "\n---M U L T I P L Y I N G   " << numerator << "/" << denominator << "   B Y   " << fraction.numerator << "/" << fraction.denominator << "---" << endl;

        fraction.numerator = numerator * fraction.numerator;
        fraction.denominator = denominator * fraction.denominator;
        fraction.simplify();
        cout << "   = " << fraction.fractionForm() << endl;
    }

    void operator/(RationalNumber& fraction) {
        cout << "\n---D I V I D I N G   " << fractionForm() << "   B Y   " << fraction.fractionForm() << "---" << endl;
        int num{};
        int denom{};

        denom = denominator * fraction.numerator;
        num = numerator * fraction.denominator;
        fraction.denominator = denom;
        fraction.numerator = num;

        fraction.simplify();
        cout << "   = " << fraction.fractionForm() << endl;
    }

private:
    int numerator{};
    int denominator{};
};

#endif // RATIONALNUMBER_H_INCLUDED
#include <iostream>
#include "RationalNumber.h"

using namespace std;

int main()
{
    RationalNumber test{4, 8};
    RationalNumber rat{3, 12};

    RationalNumber a{4, 32};
    RationalNumber b{4, 4};

    a + b;

    rat * test;

    RationalNumber c{1, 4};
    RationalNumber d{1, 8};

    c / d;

    return 0;
}