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use std::ops::{Deref, DerefMut};

use typed_headers::{Header, HeaderMapExt};

use crate::{error::ParseTypedHeaderError, FromRequest, Request, RequestBody, Result};

/// An extractor that extracts a typed header value.
pub struct TypedHeader<T>(pub T);

impl<T> Deref for TypedHeader<T> {
    type Target = T;

    fn deref(&self) -> &Self::Target {
        &self.0
    }
}

impl<T> DerefMut for TypedHeader<T> {
    fn deref_mut(&mut self) -> &mut Self::Target {
        &mut self.0
    }
}

#[async_trait::async_trait]
impl<'a, T: Header> FromRequest<'a> for TypedHeader<T> {
    type Error = ParseTypedHeaderError;

    async fn from_request(req: &'a Request, _body: &mut RequestBody) -> Result<Self, Self::Error> {
        let value = req.headers().typed_get::<T>()?;
        Ok(Self(value.ok_or_else(|| {
            ParseTypedHeaderError::HeaderRequired(T::name().to_string())
        })?))
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::{handler, Endpoint};

    #[tokio::test]
    async fn test_typed_header_extractor() {
        #[handler(internal)]
        async fn index(content_length: TypedHeader<typed_headers::ContentLength>) {
            assert_eq!(content_length.0 .0, 3);
        }

        index
            .call(Request::builder().header("content-length", 3).body("abc"))
            .await;
    }
}