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use std::sync::mpsc::{
	self,
	Receiver,
	Sender,
	TryIter,
};


pub trait Slot<T> {
	fn connector(&self) -> Sender<T>;
	fn exec_for(
		&self,
		t: T,
	);
	fn proxy(&self) -> SlotProxy<T>;
}


pub struct SlotImpl<T> {
	receiver: Receiver<T>,
	sender: Sender<T>,
}

impl<T> SlotImpl<T> {
	pub fn new() -> SlotImpl<T> {
		let (sender, receiver) = mpsc::channel();
		return SlotImpl {
			sender,
			receiver,
		};
	}

	pub fn next(&self) -> Option<T> {
		return self.receiver.try_recv().ok();
	}

	pub fn data_iter(&self) -> TryIter<T> {
		return self.receiver.try_iter();
	}

	pub fn last(&self) -> Option<T> {
		return self.data_iter().last();
	}

	pub fn discard_pending(&self) {
		self.data_iter().last();
	}
}

impl<T> Slot<T> for SlotImpl<T> {
	fn connector(&self) -> Sender<T> {
		return self.sender.clone();
	}

	fn exec_for(
		&self,
		t: T,
	) {
		match self.sender.send(t) {
			Ok(_) => trace!("exec_for:ok"),
			Err(e) => warn!("exec_for:err:{:?}", e),
		}
	}

	fn proxy(&self) -> SlotProxy<T> {
		return SlotProxy {
			sender: self.sender.clone(),
		};
	}
}

#[derive(Clone)]
pub struct SlotProxy<T> {
	sender: Sender<T>,
}

impl<T> SlotProxy<T> {
	pub fn empty() -> SlotProxy<T> {
		let (sender, _) = mpsc::channel();
		return SlotProxy {
			sender,
		};
	}
}

impl<T> Slot<T> for SlotProxy<T> {
	fn connector(&self) -> Sender<T> {
		return self.sender.clone();
	}

	fn exec_for(
		&self,
		t: T,
	) {
		match self.sender.send(t) {
			Ok(_) => trace!("exec_for:ok"),
			Err(e) => warn!("exec_for:err:{:?}", e),
		}
	}

	fn proxy(&self) -> SlotProxy<T> {
		return SlotProxy {
			sender: self.sender.clone(),
		};
	}
}