// 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::HasIntercalaryDays;

use crate::calendar::Perennial;

use crate::calendar::Positivist;

use crate::calendar::ToFromCommonDate;

use crate::calendar::ToFromOrdinalDate;

use crate::clock::TimeOfDay;

use crate::day_count::ToFixed;

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

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

use crate::display::prelude::LONG_COMPL;

use crate::display::prelude::LONG_DATE;

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 Positivist {

    fn supported_lang(lang: Language) -> bool {

        get_dict(lang).positivist.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 => match self.weekday() {

                Some(d) => d.fmt_numeric(n, opt),

                None => "".to_string(),

            },

            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 => match self.complementary() {

                Some(d) => fmt_number(d as i8, opt),

                None => "".to_string(),

            },

            NumericContent::WeekOfYear => match self.try_week_of_year() {

                Some(w) => fmt_number(w as i8, opt),

                None => "".to_string(),

            },

        }

    }

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

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

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

                let months: [&str; 13] = [

                    dict.moses,

                    dict.homer,

                    dict.aristotle,

                    dict.archimedes,

                    dict.caesar,

                    dict.saint_paul,

                    dict.charlemagne,

                    dict.dante,

                    dict.gutenburg,

                    dict.shakespeare,

                    dict.descartes,

                    dict.frederick,

                    dict.bichat,

                ];

                let name = match self.try_month() {

                    Some(m) => months[(m as usize) - 1],

                    None => "",

                };

                fmt_string(name, opt)

            }

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

            (TextContent::DayOfWeekName, _) => match self.weekday() {

                Some(m) => m.fmt_text(t, lang, opt),

                None => fmt_string("", 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_crisis_full, opt)

                } else {

                    fmt_string(dict.after_crisis_full, opt)

                }

            }

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

                if self.to_common_date().year < 0 {

                    fmt_string(dict.before_crisis_abr, opt)

                } else {

                    fmt_string(dict.after_crisis_abr, opt)

                }

            }

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

                let compl: [&str; 2] = [dict.festival_of_dead, dict.festival_of_holy_women];

                let name = match self.complementary() {

                    Some(d) => compl[(d as usize) - 1],

                    None => "",

                };

                fmt_string(name, opt)

            }

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

        }

    }

}

impl PresetDisplay for Positivist {

    fn long_date(&self) -> String {

        if self.complementary().is_some() {

            self.preset_str(Language::EN, LONG_COMPL)

        } else {

            self.preset_str(Language::EN, LONG_DATE)

        }

    }

}

impl fmt::Display for Positivist {

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

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

    }

}

impl DisplayMomentItem for Positivist {}

#[cfg(test)]

mod tests {

    use super::*;

    #[test]

    fn expected_languages() {

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

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

    }

}