/******************************************************************************
 * This program computes employee and employer FICA and FUTA taxes.
 * 
 * Copyright © 2020 Richard Lesh.  All rights reserved.
 *****************************************************************************/

#undef NDEBUG

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

using namespace Utils;
using namespace std;

static double const SS_TAX_RATE = 0.062;
static double const SS_LIMIT = 127200.0;
static double const MEDICARE_TAX_RATE1 = 0.0145;
static double const MEDICARE_TAX_RATE2 = 0.0235;
static double const MEDICARE_BREAKPOINT = 200000.0;
static double const FUTA_TAX_RATE = 0.06;
static double const FUTA_BREAKPOINT = 7000.0;

int main(int argc, char **argv) {
    if (argc != 3) {
        cout << fmt::format("Syntax: {0:s} annual_wages annual_tips", argv[0]) << endl;
        exit(1);
    }

    double const ANNUAL_WAGES = Utils::stodWithDefault(string(argv[1]), 0.0);
    double const ANNUAL_TIPS = Utils::stodWithDefault(string(argv[2]), 0.0);
    double const ANNUAL_EARNINGS = ANNUAL_WAGES + ANNUAL_TIPS;

    double ss_tax;
    if (ANNUAL_EARNINGS < SS_LIMIT) {
        ss_tax = ANNUAL_EARNINGS * SS_TAX_RATE;
    } else {
        ss_tax = SS_LIMIT * SS_TAX_RATE;
    }

    double medicare_tax;
    double employer_medicare_tax;
    if (ANNUAL_EARNINGS <= MEDICARE_BREAKPOINT) {
        medicare_tax = ANNUAL_EARNINGS * MEDICARE_TAX_RATE1;
        employer_medicare_tax = ANNUAL_EARNINGS * MEDICARE_TAX_RATE1;
    } else {
        medicare_tax = MEDICARE_BREAKPOINT * MEDICARE_TAX_RATE1 + (ANNUAL_EARNINGS - MEDICARE_BREAKPOINT) * MEDICARE_TAX_RATE2;
        employer_medicare_tax = ANNUAL_EARNINGS * MEDICARE_TAX_RATE1;
    }

    double futa_tax;
    if (ANNUAL_EARNINGS <= FUTA_BREAKPOINT) {
        futa_tax = ANNUAL_EARNINGS * FUTA_TAX_RATE;
    } else {
        futa_tax = FUTA_BREAKPOINT * FUTA_TAX_RATE;
    }

    double const NET_EARNINGS = ANNUAL_EARNINGS - ss_tax - medicare_tax;
    double const EMPLOYER_CONTRIBUTIONS = ANNUAL_EARNINGS + ss_tax + employer_medicare_tax + futa_tax;

    cout << fmt::format("Annual Earnings: ${0:.2f}", ANNUAL_EARNINGS) << endl;
    cout << fmt::format("Social Security Tax: ${0:.2f}", ss_tax) << endl;
    cout << fmt::format("Medicare Tax: ${0:.2f}", medicare_tax) << endl;
    cout << fmt::format("Employer Social Security Tax: ${0:.2f}", ss_tax) << endl;
    cout << fmt::format("Employer Medicare Tax: ${0:.2f}", employer_medicare_tax) << endl;
    cout << fmt::format("Federal Unemployment Tax: ${0:.2f}", futa_tax) << endl;
    cout << fmt::format("Net Earnings: ${0:.2f}", NET_EARNINGS) << endl;
    cout << fmt::format("Employer Contributions: ${0:.2f}", EMPLOYER_CONTRIBUTIONS) << endl;
    return 0;
}