// Copyright 2019, The Tari Project
//
// Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
// following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following
// disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
// following disclaimer in the documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote
// products derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
// USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

use std::{sync::Arc, task::Poll};

use futures::{future::BoxFuture, task::Context};
use tari_comms::{
    peer_manager::{NodeIdentity, PeerManager},
    pipeline::PipelineError,
};
use tower::Service;

use super::task::ProcessDhtMessage;
use crate::{
    DhtConfig,
    DhtRequester,
    discovery::DhtDiscoveryRequester,
    inbound::DecryptedDhtMessage,
    outbound::OutboundMessageRequester,
};

#[derive(Clone)]
pub struct DhtHandlerMiddleware<S> {
    next_service: S,
    peer_manager: Arc<PeerManager>,
    node_identity: Arc<NodeIdentity>,
    dht: DhtRequester,
    outbound_service: OutboundMessageRequester,
    discovery_requester: DhtDiscoveryRequester,
    config: Arc<DhtConfig>,
}

impl<S> DhtHandlerMiddleware<S> {
    pub fn new(
        next_service: S,
        node_identity: Arc<NodeIdentity>,
        peer_manager: Arc<PeerManager>,
        outbound_service: OutboundMessageRequester,
        dht: DhtRequester,
        discovery_requester: DhtDiscoveryRequester,
        config: Arc<DhtConfig>,
    ) -> Self {
        Self {
            next_service,
            peer_manager,
            node_identity,
            dht,
            outbound_service,
            discovery_requester,
            config,
        }
    }
}

impl<S> Service<DecryptedDhtMessage> for DhtHandlerMiddleware<S>
where
    S: Service<DecryptedDhtMessage, Response = (), Error = PipelineError> + Clone + Send + 'static,
    S::Future: Send,
{
    type Error = PipelineError;
    type Future = BoxFuture<'static, Result<Self::Response, Self::Error>>;
    type Response = ();

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

    fn call(&mut self, message: DecryptedDhtMessage) -> Self::Future {
        Box::pin(
            ProcessDhtMessage::new(
                self.next_service.clone(),
                Arc::clone(&self.peer_manager),
                self.outbound_service.clone(),
                Arc::clone(&self.node_identity),
                self.dht.clone(),
                self.discovery_requester.clone(),
                message,
                self.config.clone(),
            )
            .run(),
        )
    }
}
