use super::*;

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

crate::macros::sealed::keyword_instance!(TailwindSnapAlign => "scroll-snap-align");

impl Display for TailwindSnapAlign {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        match &self.kind {
            StandardValue::Keyword(s) => match s.as_str() {
                "start" => write!(f, "snap-start"),
                "end" => write!(f, "snap-end"),
                "center" => write!(f, "snap-center"),
                _ => write!(f, "snap-align-{}", s),
            },
            StandardValue::Arbitrary(s) => s.write_class(f, "snap-align-"),
        }
    }
}

impl TailwindSnapAlign {
    /// <https://tailwindcss.com/docs/scroll-snap-align>
    pub fn parse(pattern: &[&str], arbitrary: &TailwindArbitrary) -> Result<Self> {
        let kind = StandardValue::parser("scroll-align", &Self::check_valid)(pattern, arbitrary)?;
        Ok(Self { kind })
    }
    /// <https://developer.mozilla.org/en-US/docs/Web/CSS/scroll-snap-align#syntax>
    pub fn check_valid(mode: &str) -> bool {
        let set = BTreeSet::from_iter(vec!["center", "inherit", "initial", "none", "revert", "unset"]);
        set.contains(mode)
    }
}