#include <iostream>
#include <iomanip>

using namespace std;

int selection;
double income, income_sav, total_tax = 0;
double mtax_rate, eff_tax_rate;

// This assignment is worth 10 points
// 5 points for each successful output for single or joint file
// -1 if the initial money input is placed into an int variable
// -1 for forgetting to setting all outputs to two decimal places
// -1 for having only partially correct output in some cases
// -1 for not using constants to define brackets and rates

// Values are current for USA 2022 tax brackets
const int year = 2022;


const double 		// Define the boundaries of each tax bracket
	s_deduc = 12950,
	s_bracket1 = 23225,
	s_bracket2 = 54725,
	s_bracket3 = 102025,
	s_bracket4 = 183000,
	s_bracket5 = 228900,
	s_bracket6 = 552850;
const double		// For joint filing
	j_deduc = 25900,
        j_bracket1 = 46450,
        j_bracket2 = 109450,
        j_bracket3 = 204050,
        j_bracket4 = 366000,
        j_bracket5 = 457800,
        j_bracket6 = 673750;
const double		// Define the tax rate of each bracket
	tax_rate0 = 0,
	tax_rate1 = 0.1,
	tax_rate2 = 0.12,
	tax_rate3 = 0.22,
	tax_rate4 = 0.24,
	tax_rate5 = 0.32,
	tax_rate6 = 0.35,
	tax_rate7 = 0.37;

int main()
{
	cout << "Federal Tax Calculator for Calendar Year " << year << endl;
	cout << "Are you filing single or jointly?\n"
	     << "  1. Single\n" << "  2. Joint\n"
	     << "Select option: ";
	cin >> selection;

	cout << "Enter income ($): ";
	cin >> income;
	income_sav = income;	// back up this value for later

	switch(selection)	// if/else statements can be used here too
	{
	  case 1:	// Single filing
	    
	    if(income > s_bracket6)	// determine the marginal tax rate
	      mtax_rate = tax_rate7;
	    else if(income > s_bracket5)
	      mtax_rate = tax_rate6;
	    else if(income > s_bracket4)
              mtax_rate = tax_rate5;
	    else if(income > s_bracket3)
              mtax_rate = tax_rate4;
	    else if(income > s_bracket2)
              mtax_rate = tax_rate3;
	    else if(income > s_bracket1)
              mtax_rate = tax_rate2;
	    else if(income > s_deduc)
              mtax_rate = tax_rate1;
	    else
	      mtax_rate = tax_rate0;

	    // Calculate the taxes per bracket, starting from the highest
	    // Logic statements become 1 or 0 only, avoids negative numbers
	    total_tax += (income > s_bracket6)*tax_rate7*(income - s_bracket6);
	    income -= (income > s_bracket6) * (income - s_bracket6);
	    
	    total_tax += (income > s_bracket5)*tax_rate6*(income - s_bracket5);
	    income -= (income > s_bracket5) * (income - s_bracket5);

	    total_tax += (income > s_bracket4)*tax_rate5*(income - s_bracket4);
            income -= (income > s_bracket4) * (income - s_bracket4);
	    
	    total_tax += (income > s_bracket3)*tax_rate4*(income - s_bracket3);
            income -= (income > s_bracket3) * (income - s_bracket3);
	
	    total_tax += (income > s_bracket2)*tax_rate3*(income - s_bracket2);
            income -= (income > s_bracket2) * (income - s_bracket2);

	    total_tax += (income > s_bracket1)*tax_rate2*(income - s_bracket1);
            income -= (income > s_bracket1) * (income - s_bracket1);

	    total_tax += (income > s_deduc)*tax_rate1*(income - s_deduc);

	    break;

	  case 2:	// Joint filing
            if(income > j_bracket6)     // determine the marginal tax rate
              mtax_rate = tax_rate7;
            else if(income > j_bracket5)
              mtax_rate = tax_rate6;
            else if(income > j_bracket4)
              mtax_rate = tax_rate5;
            else if(income > j_bracket3)
              mtax_rate = tax_rate4;
            else if(income > j_bracket2)
              mtax_rate = tax_rate3;
            else if(income > j_bracket1)
              mtax_rate = tax_rate2;
	    else if(income > j_deduc)
	      mtax_rate = tax_rate1;
	    else
	      mtax_rate = tax_rate0;

	    total_tax += (income > j_bracket6)*tax_rate7*(income - j_bracket6);
            income -= (income > j_bracket6) * (income - j_bracket6);

            total_tax += (income > j_bracket5)*tax_rate6*(income - j_bracket5);
            income -= (income > j_bracket5) * (income - j_bracket5);

            total_tax += (income > j_bracket4)*tax_rate5*(income - j_bracket4);
            income -= (income > j_bracket4) * (income - j_bracket4);

            total_tax += (income > j_bracket3)*tax_rate4*(income - j_bracket3);
            income -= (income > j_bracket3) * (income - j_bracket3);

            total_tax += (income > j_bracket2)*tax_rate3*(income - j_bracket2);
            income -= (income > j_bracket2) * (income - j_bracket2);

            total_tax += (income > j_bracket1)*tax_rate2*(income - j_bracket1);
            income -= (income > j_bracket1) * (income - j_bracket1);

            total_tax += (income > j_deduc)*tax_rate1*(income - j_deduc);
 
	    break;
	}

	eff_tax_rate = total_tax/income_sav;

	cout << fixed << setprecision(2);
	cout << "Marginal tax rate: " << mtax_rate*100 << '%' << endl;
	cout << "Federal taxes due: $" << total_tax << endl;
	cout << "Effective tax rate: " << eff_tax_rate*100 << '%' << endl;

	return 0;
}