use http::{header::HeaderMap, Method};
pub use http_signature_normalization_http::{
    verify::{Algorithm, DeprecatedAlgorithm, Unverified},
    Config,
};
use std::{future::Future, pin::Pin};
use warp::{path::FullPath, Filter, Rejection};

#[cfg(feature = "digest")]
pub mod digest;

pub fn prepare_unverified(
    config: Config,
) -> impl Filter<Extract = (Unverified,), Error = Rejection> + Clone {
    warp::any()
        .map(move || config.clone())
        .and(warp::header::headers_cloned())
        .and(warp::method())
        .and(warp::path::full())
        .and(warp::query::raw())
        .and_then(
            move |config: Config,
                  headers: HeaderMap,
                  method: Method,
                  path: FullPath,
                  query: String| {
                let path_and_query = format!("{}?{}", path.as_str(), query).parse().unwrap();

                async move {
                    config
                        .begin_verify(&method, Some(&path_and_query), headers)
                        .map_err(|_| warp::reject::not_found())
                }
            },
        )
}

pub fn verify<T>(
    config: Config,
    verifier: impl Fn(Unverified) -> Pin<Box<dyn Future<Output = Result<T, ()>> + Send>>
        + Clone
        + Send
        + Sync,
) -> impl Filter<Extract = (T,), Error = Rejection> + Clone
where
    T: Send,
{
    warp::any()
        .map(move || config.clone())
        .and(warp::header::headers_cloned())
        .and(warp::method())
        .and(warp::path::full())
        .and(warp::query::raw())
        .and_then(move |config, headers, method, path, query| {
            do_verify(config, headers, method, path, query, verifier.clone())
        })
}

async fn do_verify<T>(
    config: Config,
    headers: HeaderMap,
    method: Method,
    path: FullPath,
    query: String,
    verifier: impl Fn(Unverified) -> Pin<Box<dyn Future<Output = Result<T, ()>> + Send>>,
) -> Result<T, warp::Rejection> {
    let path_and_query = format!("{}?{}", path.as_str(), query).parse().unwrap();

    match config.begin_verify(&method, Some(&path_and_query), headers) {
        Ok(v) => verifier(v).await.map_err(|_| warp::reject::not_found()),
        Err(_) => Err(warp::reject::not_found()),
    }
}