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use super::{EarlyCascadeContext, EarlyFromSpecified, Length, SpecifiedLength, SpecifiedValue};

#[derive(Copy, Clone)]
pub struct FontSize(pub Length);

impl From<Length> for FontSize {
    fn from(l: Length) -> Self {
        FontSize(l)
    }
}

impl SpecifiedValue for FontSize {
    type SpecifiedValue = SpecifiedLength;
}

impl EarlyFromSpecified for FontSize {
    fn early_from_specified(s: &SpecifiedLength, context: &EarlyCascadeContext) -> Self {
        FontSize(match s {
            SpecifiedLength::Absolute(px) => *px,
            SpecifiedLength::Em(value) => context.inherited.font.font_size.0 * *value,
        })
    }
}

pub type Em = crate::primitives::Length<crate::fonts::Em>;

impl std::ops::Mul<Em> for FontSize {
    type Output = Length;
    fn mul(self, other: Em) -> Length {
        self.0 * other.0
    }
}

impl std::ops::Div<FontSize> for Length {
    type Output = Em;

    fn div(self, other: FontSize) -> Em {
        Em::new(self.px / other.0.px)
    }
}