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    use std::sync::Arc;
    use parking_lot::Mutex;
    use message::{Payload, Message};
    use p2p::Context;
    use util::{PeerInfo, ConfigurableSynchronizer, ResponseQueue, Synchronizer, Responses};
    use futures::{lazy, finished};
    use net::PeerStats;

    pub struct PeerContext {
    	context: Arc<Context>,
    	info: PeerInfo,
    	synchronizer: Mutex<ConfigurableSynchronizer>,
    	response_queue: Mutex<ResponseQueue>,
    	stats: Mutex<PeerStats>,
    }

    impl PeerContext {
    	pub fn new(context: Arc<Context>, info: PeerInfo, synchronous: bool) -> Self {
    		PeerContext {
    			context: context,
    			info: info,
    			synchronizer: Mutex::new(ConfigurableSynchronizer::new(synchronous)),
    			response_queue: Mutex::default(),
    			stats: Mutex::default(),
    		}
    	}

    	fn to_message<T>(&self, payload: &T) -> Message<T> where T: Payload {
    		Message::new(self.info.magic, self.info.version, payload).expect("failed to create outgoing message")
    	}

    	fn send_awaiting(&self, sync: &mut ConfigurableSynchronizer, queue: &mut ResponseQueue, start_id: u32) {
    		let mut next_id = start_id;
    		loop {
    			next_id = next_id.overflowing_add(1).0;
    			match queue.responses(next_id) {
    				Some(Responses::Finished(messages)) => {
    					assert!(sync.permission_for_response(next_id));
    					for message in messages {
    						let send = Context::send_message_to_peer(self.context.clone(), self.info.id, message);
    						self.context.spawn(send);
    					}
    				},
    				Some(Responses::Ignored) => {
    					assert!(sync.permission_for_response(next_id));
    				},
    				Some(Responses::Unfinished(messages)) => {
    					assert!(sync.is_permitted(next_id));
    					for message in messages {
    						let send = Context::send_message_to_peer(self.context.clone(), self.info.id, message);
    						self.context.spawn(send);
    					}
    					break;
    				},
    				None => {
    					break;
    				}
    			}
    		}
    	}

    	/// Request is always automatically send.
    	pub fn send_request<T>(&self, payload: &T) where T: Payload {
    		self.send_request_with_flags(payload, 0)
    	}

    	/// Request is always automatically send.
    	pub fn send_request_with_flags<T>(&self, payload: &T, serialization_flags: u32) where T: Payload {
    		let send = Context::send_to_peer(self.context.clone(), self.info.id, payload, serialization_flags);
    		self.context.spawn(send);
    	}

    	pub fn declare_response(&self) -> u32 {
    		let d = self.synchronizer.lock().declare_response();
    		trace!("declared response: {}", d);
    		d
    	}

    	pub fn send_response_inline<T>(&self, payload: &T) where T: Payload {
    		let id = self.declare_response();
    		self.send_response(payload, id, true);
    	}

    	/// Do not wait for response with given id.
    	pub fn ignore_response(&self, id: u32) {
    		let mut sync = self.synchronizer.lock();
    		let mut queue = self.response_queue.lock();
    		if sync.permission_for_response(id) {
    			self.send_awaiting(&mut sync, &mut queue, id);
    		} else {
    			queue.push_ignored_response(id);
    		}
    	}

    	/// Responses are sent in order defined by synchronizer.
    	pub fn send_response<T>(&self, payload: &T, id: u32, is_final: bool) where T: Payload {
    		trace!("response ready: {}, id: {}, final: {}", T::command(), id, is_final);
    		let mut sync = self.synchronizer.lock();
    		let mut queue = self.response_queue.lock();
    		if is_final {
    			if sync.permission_for_response(id) {
    				let send = Context::send_to_peer(self.context.clone(), self.info.id, payload, 0);
    				self.context.spawn(send);
    				self.send_awaiting(&mut sync, &mut queue, id);
    			} else {
    				queue.push_finished_response(id, self.to_message(payload).into());
    			}
    		} else if sync.is_permitted(id) {
    			let send = Context::send_to_peer(self.context.clone(), self.info.id, payload, 0);
    			self.context.spawn(send);
    		} else {
    			queue.push_unfinished_response(id, self.to_message(payload).into());
    		}
    	}

    	/// Closes this context
    	pub fn close(&self) {
    		let context = self.context.clone();
    		let peer_id = self.info.id;
    		let close = lazy(move || {
    			context.close_channel(peer_id);
    			finished::<(), ()>(())
    		});
    		self.context.spawn(close);
    	}

    	pub fn info(&self) -> &PeerInfo {
    		&self.info
    	}

    	pub fn global(&self) -> &Arc<Context> {
    		&self.context
    	}

    	pub fn stats(&self) -> &Mutex<PeerStats> {
    		&self.stats
    	}
    }

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