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//! Part of a format description.

#[cfg(feature = "alloc")]
use alloc::string::String;

use crate::format_description::modifier;
#[cfg(feature = "alloc")]
use crate::{error::InvalidFormatDescription, format_description::modifier::Modifiers};

/// A component of a larger format description.
#[non_exhaustive]
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Component {
    /// Day of the month.
    Day(modifier::Day),
    /// Month of the year.
    Month(modifier::Month),
    /// Ordinal day of the year.
    Ordinal(modifier::Ordinal),
    /// Day of the week.
    Weekday(modifier::Weekday),
    /// Week within the year.
    WeekNumber(modifier::WeekNumber),
    /// Year of the date.
    Year(modifier::Year),
    /// Hour of the day.
    Hour(modifier::Hour),
    /// Minute within the hour.
    Minute(modifier::Minute),
    /// AM/PM part of the time.
    Period(modifier::Period),
    /// Second within the minute.
    Second(modifier::Second),
    /// Subsecond within the second.
    Subsecond(modifier::Subsecond),
    /// Hour of the UTC offset.
    OffsetHour(modifier::OffsetHour),
    /// Minute within the hour of the UTC offset.
    OffsetMinute(modifier::OffsetMinute),
    /// Second within the minute of the UTC offset.
    OffsetSecond(modifier::OffsetSecond),
}

/// A component with no modifiers present.
#[cfg(feature = "alloc")]
pub(crate) enum NakedComponent {
    /// Day of the month.
    Day,
    /// Month of the year.
    Month,
    /// Ordinal day of the year.
    Ordinal,
    /// Day of the week.
    Weekday,
    /// Week within the year.
    WeekNumber,
    /// Year of the date.
    Year,
    /// Hour of the day.
    Hour,
    /// Minute within the hour.
    Minute,
    /// AM/PM part of the time.
    Period,
    /// Second within the minute.
    Second,
    /// Subsecond within the second.
    Subsecond,
    /// Hour of the UTC offset.
    OffsetHour,
    /// Minute within the hour of the UTC offset.
    OffsetMinute,
    /// Second within the minute of the UTC offset.
    OffsetSecond,
}

#[cfg(feature = "alloc")]
impl NakedComponent {
    /// Parse a component (without its modifiers) from the provided name.
    pub(crate) fn parse(
        component_name: &[u8],
        component_index: usize,
    ) -> Result<Self, InvalidFormatDescription> {
        match component_name {
            b"day" => Ok(Self::Day),
            b"month" => Ok(Self::Month),
            b"ordinal" => Ok(Self::Ordinal),
            b"weekday" => Ok(Self::Weekday),
            b"week_number" => Ok(Self::WeekNumber),
            b"year" => Ok(Self::Year),
            b"hour" => Ok(Self::Hour),
            b"minute" => Ok(Self::Minute),
            b"period" => Ok(Self::Period),
            b"second" => Ok(Self::Second),
            b"subsecond" => Ok(Self::Subsecond),
            b"offset_hour" => Ok(Self::OffsetHour),
            b"offset_minute" => Ok(Self::OffsetMinute),
            b"offset_second" => Ok(Self::OffsetSecond),
            b"" => Err(InvalidFormatDescription::MissingComponentName {
                index: component_index,
            }),
            _ => Err(InvalidFormatDescription::InvalidComponentName {
                name: String::from_utf8_lossy(component_name).into_owned(),
                index: component_index,
            }),
        }
    }

    /// Attach the necessary modifiers to the component.
    pub(crate) fn attach_modifiers(self, modifiers: &Modifiers) -> Component {
        match self {
            Self::Day => Component::Day(modifier::Day {
                padding: modifiers.padding.unwrap_or_default(),
            }),
            Self::Month => Component::Month(modifier::Month {
                padding: modifiers.padding.unwrap_or_default(),
                repr: modifiers.month_repr.unwrap_or_default(),
                case_sensitive: modifiers.case_sensitive.unwrap_or(true),
            }),
            Self::Ordinal => Component::Ordinal(modifier::Ordinal {
                padding: modifiers.padding.unwrap_or_default(),
            }),
            Self::Weekday => Component::Weekday(modifier::Weekday {
                repr: modifiers.weekday_repr.unwrap_or_default(),
                one_indexed: modifiers.weekday_is_one_indexed.unwrap_or(true),
                case_sensitive: modifiers.case_sensitive.unwrap_or(true),
            }),
            Self::WeekNumber => Component::WeekNumber(modifier::WeekNumber {
                padding: modifiers.padding.unwrap_or_default(),
                repr: modifiers.week_number_repr.unwrap_or_default(),
            }),
            Self::Year => Component::Year(modifier::Year {
                padding: modifiers.padding.unwrap_or_default(),
                repr: modifiers.year_repr.unwrap_or_default(),
                iso_week_based: modifiers.year_is_iso_week_based.unwrap_or_default(),
                sign_is_mandatory: modifiers.sign_is_mandatory.unwrap_or_default(),
            }),
            Self::Hour => Component::Hour(modifier::Hour {
                padding: modifiers.padding.unwrap_or_default(),
                is_12_hour_clock: modifiers.hour_is_12_hour_clock.unwrap_or_default(),
            }),
            Self::Minute => Component::Minute(modifier::Minute {
                padding: modifiers.padding.unwrap_or_default(),
            }),
            Self::Period => Component::Period(modifier::Period {
                is_uppercase: modifiers.period_is_uppercase.unwrap_or(true),
                case_sensitive: modifiers.case_sensitive.unwrap_or(true),
            }),
            Self::Second => Component::Second(modifier::Second {
                padding: modifiers.padding.unwrap_or_default(),
            }),
            Self::Subsecond => Component::Subsecond(modifier::Subsecond {
                digits: modifiers.subsecond_digits.unwrap_or_default(),
            }),
            Self::OffsetHour => Component::OffsetHour(modifier::OffsetHour {
                sign_is_mandatory: modifiers.sign_is_mandatory.unwrap_or_default(),
                padding: modifiers.padding.unwrap_or_default(),
            }),
            Self::OffsetMinute => Component::OffsetMinute(modifier::OffsetMinute {
                padding: modifiers.padding.unwrap_or_default(),
            }),
            Self::OffsetSecond => Component::OffsetSecond(modifier::OffsetSecond {
                padding: modifiers.padding.unwrap_or_default(),
            }),
        }
    }
}