// This Source Code Form is subject to the terms of the Mozilla Public

// License, v. 2.0. If a copy of the MPL was not distributed with this

// file, You can obtain one at https://mozilla.org/MPL/2.0/.

use crate::calendar::Roman;

use crate::calendar::RomanMonthlyEvent;

use crate::display::private::get_dict;

use crate::display::text::prelude::Language;

use numerals;

use std::fmt;

impl fmt::Display for Roman {

    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {

        let dict = get_dict(Language::EN)

            .roman

            .as_ref()

            .expect("Known to exist");

        let event_name = match self.event() {

            RomanMonthlyEvent::Kalends => dict.kalends,

            RomanMonthlyEvent::Nones => dict.nones,

            RomanMonthlyEvent::Ides => dict.ides,

        };

        let months: [&str; 12] = [

            dict.january,

            dict.february,

            dict.march,

            dict.april,

            dict.may,

            dict.june,

            dict.july,

            dict.august,

            dict.september,

            dict.october,

            dict.november,

            dict.december,

        ];

        let month_name = months[self.month() as usize - 1];

        let year = Roman::auc_year_from_julian(self.year());

        if self.count().get() == 1 {

            write!(

                f,

                "{} {} {}, {} {}",

                event_name, dict.x_of_y, month_name, year, dict.after_auc_full

            )

        } else if self.count().get() == 2 {

            write!(

                f,

                "{} {} {}, {} {}",

                dict.pridie, event_name, month_name, year, dict.after_auc_full

            )

        } else {

            let bissextum = if self.leap() { 
dict.bissextum1
 } else { 
""1
 };

            let bissextum_space = if self.leap() { 
" "1
 } else { 
""1
 };

            write!(

                f,

                "{} {}{}{:X} {} {}, {} {}",

                dict.ante_diem,

                bissextum,

                bissextum_space,

                numerals::roman::Roman::from(self.count().get() as i16),

                event_name,

                month_name,

                year,

                dict.after_auc_full

            )

        }

    }

}

#[cfg(test)]

mod tests {

    use super::*;

    use crate::calendar::CommonDate;

    use crate::calendar::Julian;

    use crate::calendar::ToFromCommonDate;

    use crate::day_count::FromFixed;

    use crate::day_count::ToFixed;

    #[test]

    fn second_sixth_day_before_kalends_of_march() {

        let j24 = Julian::try_from_common_date(CommonDate::new(4, 2, 24)).unwrap();

        let j25 = Julian::try_from_common_date(CommonDate::new(4, 2, 25)).unwrap();

        let f24 = j24.to_fixed();

        let f25 = j25.to_fixed();

        let r24s = Roman::from_fixed(f24).to_string();

        let r25s = Roman::from_fixed(f25).to_string();

        assert!(r24s.starts_with("ante diem VI Kalends March"), "{}", r24s);

        assert!(

            r25s.starts_with("ante diem bissextum VI Kalends March"),

            "{}",

            r25s

        );

    }

    #[test]

    fn pridie_nones_of_march() {

        let j = Julian::try_from_common_date(CommonDate::new(-44, 3, 6)).unwrap();

        let f = j.to_fixed();

        let r = Roman::from_fixed(f);

        assert!(r.to_string().starts_with("pridie Nones March"));

    }

    #[test]

    fn pridie_ides_of_march() {

        let j = Julian::try_from_common_date(CommonDate::new(-44, 3, 14)).unwrap();

        let f = j.to_fixed();

        let r = Roman::from_fixed(f);

        assert!(r.to_string().starts_with("pridie Ides March"));

    }

    #[test]

    fn ides_of_march() {

        let j = Julian::try_from_common_date(CommonDate::new(-44, 3, 15)).unwrap();

        let f = j.to_fixed();

        let r = Roman::from_fixed(f);

        assert!(r.to_string().starts_with("Ides of March"));

    }

}