/******************************************************************************
 * This program computes federal income tax for single taxpayers.
 * 
 * Copyright © 2020 Richard Lesh.  All rights reserved.
 *****************************************************************************/

#undef NDEBUG

#include "Utils.hpp"
#include <fmt/format.h>
#include <iostream>
#include <string>

using namespace std;

int main(int argc, char **argv) {
    double income = 0.;
    double income_tax = 0.;
    if (argc == 2) {
        income = Utils::stodWithDefault(string(argv[1]), 0);
    } else {
        cout << fmt::format("Syntax: {0:s} income", argv[0]) << endl;
        exit(1);
    }
    if (income <= 9875.) {
        income_tax += income * 0.10;
    } else {
        income_tax += 9875. * 0.10;
        if (income <= 40125.) {
            income_tax += (income - 9875.) * 0.12;
        } else {
            income_tax += (40125. - 9875.) * 0.12;
            if (income <= 85525.) {
                income_tax += (income - 40125.) * 0.22;
            } else {
                income_tax += (85525. - 40125.) * 0.22;
                if (income <= 163300.) {
                    income_tax += (income - 85525.) * 0.24;
                } else {
                    income_tax += (163300. - 85525.) * 0.24;
                    if (income <= 207350.) {
                        income_tax += (income - 163300.) * 0.32;
                    } else {
                        income_tax += (207350. - 163300.) * 0.32;
                        if (income <= 518400.) {
                            income_tax += (income - 207350.) * 0.35;
                        } else {
                            income_tax += (518400. - 207350.) * 0.35;
                            if (income > 518400.) {
                                income_tax += (income - 518400.) * 0.37;
                            }
                        }
                    }
                }
            }
        }
    }

    cout << fmt::format("Federal Income Tax: ${0:.2f}", income_tax) << endl;
    return 0;
}