// Copyright 2015, 2016 Ethcore (UK) Ltd.
// This file is part of Parity.

// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with Parity.  If not, see <http://www.gnu.org/licenses/>.

use std::sync::RwLock;
use std::ops::*;

pub struct Service {
	pub commits: RwLock<usize>,
	pub rollbacks: RwLock<usize>,
}

#[derive(Ipc)]
impl Service {
	fn commit(&self, f: u32) -> u32 {
		let mut lock = self.commits.write().unwrap();
		*lock = *lock + f as usize;
		f
	}
	pub fn rollback(&self, a: u32, b: u32) -> i32 {
		let mut lock = self.rollbacks.write().unwrap();
		*lock = *lock + a as usize - b as usize;
		(a - b) as i32
	}
}

impl<S: ::ipc::IpcSocket> ServiceProxy<S> {
	pub fn commit(&self, f: u32) -> u32 {
		#[derive(Serialize)]
		struct Request<'a> {
			f: &'a u32,
		}
		let payload = Request{ f: &f, };

		let mut socket_ref = self.socket.borrow_mut();
		let mut socket = socket_ref.deref_mut();

		let serialized_payload = ::bincode::serde::serialize(&payload, ::bincode::SizeLimit::Infinite).unwrap();
		::ipc::invoke(0, &Some(serialized_payload), &mut socket);

		while !socket.ready().load(::std::sync::atomic::Ordering::Relaxed) { }
		::bincode::serde::deserialize_from::<_, u32>(&mut socket, ::bincode::SizeLimit::Infinite).unwrap()
	}

	pub fn new(socket: S) -> ServiceProxy<S> {
		ServiceProxy {
			socket: ::std::cell::RefCell::new(socket),
			phantom: ::std::marker::PhantomData,
		}
	}

	#[cfg(test)]
	pub fn socket(&self) -> &::std::cell::RefCell<S> {
		&self.socket
	}
}

impl Service {
	pub fn new() -> Service {
		Service {
			commits: RwLock::new(0usize),
			rollbacks: RwLock::new(0usize),
		}
	}
}