use crate::http::Response;
pub use crate::url_map;

pub use warp::path as warp_path;

pub type UrlMap = warp::filters::BoxedFilter<(Response,)>;

#[doc(hidden)]
#[macro_export]
macro_rules! __url_map_inner {
    (@root => $view:expr, $($rest:tt)*) => {{
        let chain = $crate::__url_map_inner!(@one => $view);
        $crate::__url_map_inner!(chain @rest $($rest)*)
    }};
    (@root $head:tt $(/ $tail:tt)* => $view:expr, $($rest:tt)*) => {{
        let chain = $crate::__url_map_inner!(@one $head $(/ $tail)* => $view);
        $crate::__url_map_inner!(chain @rest $($rest)*)
    }};
    (@root $head:tt $(/ $tail:tt)* $child:expr, $($rest:tt)*) => {{
        let chain = $crate::__url_map_inner!(@one $head $(/ $tail)* $child);
        $crate::__url_map_inner!(chain @rest $($rest)*)
    }};

    ($chain:ident @rest => $view:expr, $($rest:tt)*) => {{
        let chain = $chain
            .or($crate::__url_map_inner!(@one => $view))
            .unify();
        $crate::__url_map_inner!(chain @rest $($rest)*)
    }};
    ($chain:ident @rest $head:tt $(/ $tail:tt)* => $view:expr, $($rest:tt)*) => {{
        let chain = $chain
            .or($crate::__url_map_inner!(@one $head $(/ $tail)* => $view))
            .unify();
        $crate::__url_map_inner!(chain @rest $($rest)*)
    }};
    ($chain:ident @rest $head:tt $(/ $tail:tt)* $child:expr, $($rest:tt)*) => {{
        let chain = $chain
            .or($crate::__url_map_inner!(@one $head $(/ $tail)* $child))
            .unify();
        $crate::__url_map_inner!(chain @rest $($rest)*)
    }};
    ($chain:ident @rest) => { $chain };

    (@one => $view:expr) => {
        $crate::urls::warp_path::end().map($view)
    };
    (@one $head:tt $(/ $tail:tt)* => $view:expr) => {
        $crate::urls::warp_path!($head $(/ $tail)*).map($view)
    };
    (@one $head:tt $(/ $tail:tt)* $child:expr) => {
        $crate::urls::warp_path!($head $(/ $tail)*).and($child)
    };
}

#[macro_export]
macro_rules! url_map {
    ($($body:tt)*) => {{
        use $crate::http::Filter;
        $crate::__url_map_inner!(@root $($body)*)
            .boxed()
    }};
}