use super::*;

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

crate::macros::sealed::keyword_instance!(TailwindBackgroundAttachment => "background-attachment");

impl Display for TailwindBackgroundAttachment {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        write!(f, "bg-")?;
        let s = self.kind.get_properties();
        match s {
            s @ ("fixed" | "local" | "scroll") => write!(f, "{}", s),
            _ => write!(f, "attach-{}", s),
        }
    }
}

impl TailwindBackgroundAttachment {
    /// <https://tailwindcss.com/docs/background-attachment>
    pub fn parse(pattern: &[&str], arbitrary: &TailwindArbitrary) -> Result<Self> {
        Ok(Self { kind: KeywordOnly::parser("bg-attach", &Self::check_valid)(pattern, arbitrary)? })
    }
    /// <https://tailwindcss.com/docs/background-attachment>
    pub fn parse_arbitrary(arbitrary: &TailwindArbitrary) -> Result<Self> {
        Ok(Self { kind: KeywordOnly::parse_arbitrary(arbitrary)? })
    }
    /// <https://developer.mozilla.org/en-US/docs/Web/CSS/background-attachment#syntax>
    pub fn check_valid(mode: &str) -> bool {
        let set = BTreeSet::from_iter(vec![
            // Keyword values
            "auto",
            "avoid",
            // Page break values
            "avoid-page",
            // Column break values
            "avoid-column",
            // Region break values
            "avoid-region",
            // Global values
            "inherit",
            "initial",
            "revert",
            "unset",
        ]);
        set.contains(mode)
    }
}