/******************************************************************************
 * This program computes the Ordinal Day of a date.
 * 
 * Copyright © 2020 Richard Lesh.  All rights reserved.
 *****************************************************************************/

#undef NDEBUG

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

using namespace std;

/******************************************************************************
 * Returns true if a year is a leap year.
 *****************************************************************************/
bool is_leap_year(int Y) noexcept {
    return Y % 4 == 0 && Y % 100 != 0 || Y % 400 == 0;
}

/******************************************************************************
 * This function computes the Oridnal Date or number of
 * days starting with January 1 of the year in the proleptic 
 * Gregorian calendar.
 * Source: https://en.wikipedia.org/wiki/Ordinal_date
 *****************************************************************************/
int ordinal_date(int M, int D, int Y) noexcept {

    int od = D;
    if (M == 2) {
        od += 31;
    } else {
        od += floor(30.6 * M - 91.4);
        od += is_leap_year(Y) ? 60 : 59;
    }
    return od;
}

int main(int argc, char **argv) {
    int month = 0;
    int day = 0;
    int year = 0;
    if (argc == 4) {
        month = Utils::stoiWithDefault(string(argv[1]), 0);
        day = Utils::stoiWithDefault(string(argv[2]), 0);
        year = Utils::stoiWithDefault(string(argv[3]), 0);
    } else {
        cout << fmt::format("Syntax: {0:s} month day year", argv[0]) << endl;
        cout << "Syntax: " << argv[0] << " {month} {day} {year}" << endl;
        exit(1);
    }

    int od = ordinal_date(month, day, year);
    cout << fmt::format("{0:d}/{1:d}/{2:d} = {3:d} Ordinal Date", month, day, year, od) << endl;
    return 0;
}