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use crate::{
    endpoint::BoxEndpoint,
    http::{header, StatusCode},
    route::internal::trie::Trie,
    Endpoint, EndpointExt, IntoEndpoint, Request, Response,
};

/// Routing object for `HOST` header
#[derive(Default)]
pub struct RouteDomain {
    tree: Trie<BoxEndpoint<'static, Response>>,
}

impl RouteDomain {
    /// Create a `RouteDomain` object.
    pub fn new() -> Self {
        Default::default()
    }

    /// Add an [Endpoint] to the specified domain pattern.
    ///
    /// # Example
    ///
    /// ```
    /// use poem::{endpoint::make_sync, handler, http::header, Endpoint, Request, RouteDomain};
    ///
    /// let app = RouteDomain::new()
    ///     .add("example.com", make_sync(|_| "1"))
    ///     .add("www.+.com", make_sync(|_| "2"))
    ///     .add("*.example.com", make_sync(|_| "3"))
    ///     .add("*", make_sync(|_| "4"));
    ///
    /// fn make_request(host: &str) -> Request {
    ///     Request::builder().header(header::HOST, host).finish()
    /// }
    ///
    /// async fn do_request(app: &RouteDomain, req: Request) -> String {
    ///     app.call(req).await.into_body().into_string().await.unwrap()
    /// }
    ///
    /// # tokio::runtime::Runtime::new().unwrap().block_on(async {
    /// assert_eq!(do_request(&app, make_request("example.com")).await, "1");
    /// assert_eq!(do_request(&app, make_request("www.abc.com")).await, "2");
    /// assert_eq!(do_request(&app, make_request("a.b.example.com")).await, "3");
    /// assert_eq!(do_request(&app, make_request("rust-lang.org")).await, "4");
    /// assert_eq!(do_request(&app, Request::default()).await, "4");
    /// # });
    /// ```
    pub fn add<E>(mut self, pattern: impl AsRef<str>, ep: E) -> Self
    where
        E: IntoEndpoint,
        E::Endpoint: 'static,
    {
        self.tree.add(
            pattern.as_ref(),
            Box::new(ep.into_endpoint().map_to_response()),
        );
        self
    }
}

#[async_trait::async_trait]
impl Endpoint for RouteDomain {
    type Output = Response;

    async fn call(&self, req: Request) -> Self::Output {
        let host = req
            .headers()
            .get(header::HOST)
            .and_then(|host| host.to_str().ok())
            .unwrap_or_default();
        match self.tree.matches(host) {
            Some(ep) => ep.call(req).await,
            None => StatusCode::NOT_FOUND.into(),
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::{endpoint::make_sync, handler, http::HeaderMap};

    async fn check(r: &RouteDomain, host: &str, value: &str) {
        let mut req = Request::builder();
        if !host.is_empty() {
            req = req.header(header::HOST, host);
        }
        assert_eq!(
            r.call(req.finish())
                .await
                .into_body()
                .into_string()
                .await
                .unwrap(),
            value
        );
    }

    #[tokio::test]
    async fn route_domain() {
        #[handler(internal)]
        fn h(headers: &HeaderMap) -> String {
            headers
                .get(header::HOST)
                .and_then(|value| value.to_str().ok())
                .unwrap_or_default()
                .to_string()
        }

        let r = RouteDomain::new()
            .add("example.com", make_sync(|_| "1"))
            .add("www.example.com", make_sync(|_| "2"))
            .add("www.+.com", make_sync(|_| "3"))
            .add("*.com", make_sync(|_| "4"))
            .add("*", make_sync(|_| "5"));

        check(&r, "example.com", "1").await;
        check(&r, "www.example.com", "2").await;
        check(&r, "www.abc.com", "3").await;
        check(&r, "abc.com", "4").await;
        check(&r, "rust-lang.org", "5").await;
        check(&r, "", "5").await;
    }

    #[tokio::test]
    async fn not_found() {
        let r = RouteDomain::new()
            .add("example.com", make_sync(|_| "1"))
            .add("www.example.com", make_sync(|_| "2"))
            .add("www.+.com", make_sync(|_| "3"))
            .add("*.com", make_sync(|_| "4"));

        assert_eq!(
            r.call(
                Request::builder()
                    .header(header::HOST, "rust-lang.org")
                    .finish()
            )
            .await
            .status(),
            StatusCode::NOT_FOUND,
        );
        assert_eq!(
            r.call(Request::default()).await.status(),
            StatusCode::NOT_FOUND,
        );
    }
}