use axum::{
    async_trait,
    extract::FromRequestParts,
    http::{
        header::{HeaderValue, ACCEPT},
        request::Parts,
        StatusCode,
    },
};

pub struct ExtractAccept(pub HeaderValue);

#[async_trait]
impl<S> FromRequestParts<S> for ExtractAccept
where
    S: Send + Sync,
{
    type Rejection = (StatusCode, &'static str);

    async fn from_request_parts(parts: &mut Parts, _state: &S) -> Result<Self, Self::Rejection> {
        if let Some(user_agent) = parts.headers.get(ACCEPT) {
            Ok(ExtractAccept(user_agent.clone()))
        } else {
            Err((StatusCode::BAD_REQUEST, "`User-Agent` header is missing"))
        }
    }
}