// 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::CommonWeekOfYear;

use crate::calendar::Gregorian;

use crate::calendar::ToFromCommonDate;

use crate::calendar::ToFromOrdinalDate;

use crate::clock::TimeOfDay;

use crate::day_count::ToFixed;

use crate::day_cycle::Weekday;

use crate::display::moment::DisplayMomentItem;

use crate::display::prelude::PresetDisplay;

use crate::display::private::fmt_days_since_epoch;

use crate::display::private::fmt_number;

use crate::display::private::fmt_quarter;

use crate::display::private::fmt_seconds_since_epoch;

use crate::display::private::fmt_string;

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

use crate::display::private::DisplayItem;

use crate::display::private::DisplayOptions;

use crate::display::private::NumericContent;

use crate::display::private::TextContent;

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

use std::fmt;

impl DisplayItem for Gregorian {

    fn supported_lang(lang: Language) -> bool {

        get_dict(lang).gregorian.as_ref().is_some()

    }

    fn fmt_numeric(&self, n: NumericContent, opt: DisplayOptions) -> String {

        match n {

            NumericContent::Month | NumericContent::DayOfMonth | NumericContent::Year => {

                self.to_common_date().fmt_numeric(n, opt)

            }

            NumericContent::DayOfWeek => self.convert::<Weekday>().fmt_numeric(n, opt),

            NumericContent::DayOfYear => self.to_ordinal().fmt_numeric(n, opt),

            NumericContent::Hour1to12

            | NumericContent::Hour0to23

            | NumericContent::Minute

            | NumericContent::Second => self.convert::<TimeOfDay>().fmt_numeric(n, opt),

            NumericContent::SecondsSinceEpoch => fmt_seconds_since_epoch(*self, opt),

            NumericContent::Quarter => fmt_quarter(*self, opt),

            NumericContent::DaysSinceEpoch => fmt_days_since_epoch(*self, opt),

            NumericContent::ComplementaryDay => String::from(""),

            NumericContent::WeekOfYear => fmt_number(self.week_of_year() as i16, opt),

        }

    }

    fn fmt_text(&self, t: TextContent, lang: Language, opt: DisplayOptions) -> String {

        match (t, get_dict(lang).gregorian.as_ref()) {

            (TextContent::MonthName, Some(dict)) => {

                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 name = months[self.to_common_date().month as usize - 1];

                fmt_string(name, opt)

            }

            (TextContent::DayOfMonthName, _) => fmt_string("", opt),

            (TextContent::DayOfWeekName, _) => self.convert::<Weekday>().fmt_text(t, lang, opt),

            (TextContent::HalfDayName | TextContent::HalfDayAbbrev, _) => {

                self.convert::<TimeOfDay>().fmt_text(t, lang, opt)

            }

            (TextContent::EraName, Some(dict)) => {

                if self.to_common_date().year < 0 {

                    fmt_string(dict.before_common_era_full, opt)

                } else {

                    fmt_string(dict.common_era_full, opt)

                }

            }

            (TextContent::EraAbbreviation, Some(dict)) => {

                if self.to_common_date().year < 0 {

                    fmt_string(dict.before_common_era_abr, opt)

                } else {

                    fmt_string(dict.common_era_abr, opt)

                }

            }

            (_, _) => String::from(""),

        }

    }

}

impl PresetDisplay for Gregorian {}

impl fmt::Display for Gregorian {

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

        write!(f, "{}", self.long_date())

    }

}

impl DisplayMomentItem for Gregorian {}

#[cfg(test)]

mod tests {

    use super::*;

    use crate::calendar::CommonDate;

    #[test]

    fn expected_languages() {

        assert!(Gregorian::supported_lang(Language::EN));

        assert!(Gregorian::supported_lang(Language::FR));

    }

    #[test]

    fn long_date() {

        let d_list = [

            (

                CommonDate::new(1582, 10, 15),

                "Friday October 15, 1582 Common Era",

            ),

            (

                CommonDate::new(2012, 12, 21),

                "Friday December 21, 2012 Common Era",

            ),

            (

                CommonDate::new(2025, 1, 1),

                "Wednesday January 1, 2025 Common Era",

            ),

            (

                CommonDate::new(2025, 6, 29),

                "Sunday June 29, 2025 Common Era",

            ),

            (

                CommonDate::new(2025, 6, 30),

                "Monday June 30, 2025 Common Era",

            ),

            (

                CommonDate::new(2025, 7, 1),

                "Tuesday July 1, 2025 Common Era",

            ),

        ];

        for 
item6
 in d_list {

            let d = Gregorian::try_from_common_date(item.0).unwrap();

            let s = d.long_date();

            assert_eq!(s, item.1);

        }

    }

    #[test]

    fn short_date() {

        let d_list = [

            (CommonDate::new(1582, 10, 15), "1582-10-15"),

            (CommonDate::new(2012, 12, 21), "2012-12-21"),

            (CommonDate::new(2025, 1, 1), "2025-01-01"),

            (CommonDate::new(2025, 6, 29), "2025-06-29"),

            (CommonDate::new(2025, 6, 30), "2025-06-30"),

            (CommonDate::new(2025, 7, 1), "2025-07-01"),

        ];

        for 
item6
 in d_list {

            let d = Gregorian::try_from_common_date(item.0).unwrap();

            let s = d.short_date();

            assert_eq!(s, item.1);

        }

    }

}