use super::*;

#[doc=include_str!("readme.md")]
#[derive(Debug, Clone)]
pub struct TailwindBackgroundSize {
    kind: StandardValue,
}

crate::macros::sealed::keyword_instance!(TailwindBackgroundSize => "background-size");

impl Display for TailwindBackgroundSize {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        match &self.kind {
            StandardValue::Keyword(s) => match s.as_str() {
                s @ ("auto" | "cover" | "contain") => write!(f, "bg-{}", s),
                _ => write!(f, "bg-size-{}", s),
            },
            StandardValue::Arbitrary(s) => s.write_class(f, "bg-size-"),
        }
    }
}

impl TailwindBackgroundSize {
    /// <https://tailwindcss.com/docs/background-size>
    pub fn parse(pattern: &[&str], arbitrary: &TailwindArbitrary) -> Result<Self> {
        let kind = StandardValue::parser("bg-size", &Self::check_valid)(pattern, arbitrary)?;
        Ok(Self { kind })
    }
    /// <https://developer.mozilla.org/en-US/docs/Web/CSS/background-size#syntax>
    pub fn check_valid(mode: &str) -> bool {
        let set = BTreeSet::from_iter(vec!["auto", "contain", "cover", "inherit", "initial", "revert", "unset"]);
        set.contains(mode)
    }
}