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use std::fmt;

use crate::{lowercase, transform};

/// This trait defines a kebab case conversion.
///
/// In kebab-case, word boundaries are indicated by hyphens.
///
/// ## Example:
///
/// ```rust
/// use heck::ToKebabCase;
///
/// let sentence = "We are going to inherit the earth.";
/// assert_eq!(sentence.to_kebab_case(), "we-are-going-to-inherit-the-earth");
/// ```
pub trait ToKebabCase: ToOwned {
    /// Convert this type to kebab case.
    fn to_kebab_case(&self) -> Self::Owned;
}

impl ToKebabCase for str {
    fn to_kebab_case(&self) -> Self::Owned {
        AsKebabCase(self).to_string()
    }
}

/// This wrapper performs a kebab case conversion in [`fmt::Display`].
///
/// ## Example:
///
/// ```
/// use heck::AsKebabCase;
///
/// let sentence = "We are going to inherit the earth.";
/// assert_eq!(format!("{}", AsKebabCase(sentence)), "we-are-going-to-inherit-the-earth");
/// ```
pub struct AsKebabCase<T: AsRef<str>>(pub T);

impl<T: AsRef<str>> fmt::Display for AsKebabCase<T> {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        transform(self.0.as_ref(), lowercase, |f| write!(f, "-"), f)
    }
}

#[cfg(test)]
mod tests {
    use super::ToKebabCase;

    macro_rules! t {
        ($t:ident : $s1:expr => $s2:expr) => {
            #[test]
            fn $t() {
                assert_eq!($s1.to_kebab_case(), $s2)
            }
        };
    }

    t!(test1: "CamelCase" => "camel-case");
    t!(test2: "This is Human case." => "this-is-human-case");
    t!(test3: "MixedUP CamelCase, with some Spaces" => "mixed-up-camel-case-with-some-spaces");
    t!(test4: "mixed_up_ snake_case with some _spaces" => "mixed-up-snake-case-with-some-spaces");
    t!(test5: "kebab-case" => "kebab-case");
    t!(test6: "SHOUTY_SNAKE_CASE" => "shouty-snake-case");
    t!(test7: "snake_case" => "snake-case");
    t!(test8: "this-contains_ ALLKinds OfWord_Boundaries" => "this-contains-all-kinds-of-word-boundaries");
    #[cfg(feature = "unicode")]
    t!(test9: "XΣXΣ baffle" => "xσxς-baffle");
    t!(test10: "XMLHttpRequest" => "xml-http-request");
}