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use actix_service::Service;
use actix_web::{
    dev::{ServiceRequest, ServiceResponse},
    http, Error, HttpResponse,
};
use futures::future::{ok, Either, Ready};
use std::task::{Context, Poll};

pub struct RedirectSchemeService<S> {
    pub service: S,
    pub disable: bool,
    pub https_to_http: bool,
    pub temporary: bool,
    pub replacements: Vec<(String, String)>,
}

type ReadyResult<R, E> = Ready<Result<R, E>>;

impl<S, B> Service for RedirectSchemeService<S>
where
    S: Service<Request = ServiceRequest, Response = ServiceResponse<B>, Error = Error>,
    S::Future: 'static,
{
    type Request = ServiceRequest;
    type Response = ServiceResponse<B>;
    type Error = Error;
    type Future = Either<S::Future, ReadyResult<Self::Response, Self::Error>>;

    fn poll_ready(&mut self, cx: &mut Context) -> Poll<Result<(), Self::Error>> {
        self.service.poll_ready(cx)
    }

    fn call(&mut self, req: ServiceRequest) -> Self::Future {
        if self.disable
            || (!self.https_to_http && req.connection_info().scheme() == "https")
            || (self.https_to_http && req.connection_info().scheme() == "http")
        {
            Either::Left(self.service.call(req))
        } else {
            let host = req.connection_info().host().to_owned();
            let uri = req.uri().to_owned();
            let mut url = if self.https_to_http {
                format!("http://{}{}", host, uri)
            } else {
                format!("https://{}{}", host, uri)
            };
            for (s1, s2) in self.replacements.iter() {
                url = url.replace(s1, s2);
            }
            Either::Right(ok(req.into_response(
                if self.temporary {
                    HttpResponse::TemporaryRedirect()
                } else {
                    HttpResponse::MovedPermanently()
                }
                .header(http::header::LOCATION, url)
                .finish()
                .into_body(),
            )))
        }
    }
}