// 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::net::{SocketAddr, ToSocketAddrs};
use std::hash::{Hash, Hasher};
use std::str::{FromStr};
use hash::*;
use rlp::*;
use time::Tm;
use error::*;

/// Node public key
pub type NodeId = H512;

#[derive(Debug)]
/// Noe address info
pub struct NodeEndpoint {
	/// IP(V4 or V6) address
	pub address: SocketAddr,
	/// Address as string (can be host name).
	pub address_str: String,
	/// Conneciton port.
	pub udp_port: u16
}

impl FromStr for NodeEndpoint {
	type Err = UtilError;

	/// Create endpoint from string. Performs name resolution if given a host name.
	fn from_str(s: &str) -> Result<NodeEndpoint, UtilError> {
		let address = s.to_socket_addrs().map(|mut i| i.next());
		match address {
			Ok(Some(a)) => Ok(NodeEndpoint {
				address: a,
				address_str: s.to_owned(),
				udp_port: a.port()
			}),
			Ok(_) => Err(UtilError::AddressResolve(None)),
			Err(e) => Err(UtilError::AddressResolve(Some(e)))
		}
	}
}

#[derive(PartialEq, Eq, Copy, Clone)]
pub enum PeerType {
	Required,
	Optional
}

pub struct Node {
	pub id: NodeId,
	pub endpoint: NodeEndpoint,
	pub peer_type: PeerType,
	pub last_attempted: Option<Tm>,
}

impl FromStr for Node {
	type Err = UtilError;
	fn from_str(s: &str) -> Result<Self, Self::Err> {
		let (id, endpoint) = if &s[0..8] == "enode://" && s.len() > 136 && &s[136..137] == "@" {
			(try!(NodeId::from_str(&s[8..136])), try!(NodeEndpoint::from_str(&s[137..])))
		}
		else {
			(NodeId::new(), try!(NodeEndpoint::from_str(s)))
		};

		Ok(Node {
			id: id,
			endpoint: endpoint,
			peer_type: PeerType::Optional,
			last_attempted: None,
		})
	}
}

impl PartialEq for Node {
	fn eq(&self, other: &Self) -> bool {
		self.id == other.id
	}
}
impl Eq for Node { }

impl Hash for Node {
	fn hash<H>(&self, state: &mut H) where H: Hasher {
		self.id.hash(state)
	}
}

#[cfg(test)]
mod tests {
	use super::*;
	use std::str::FromStr;
	use std::net::*;
	use hash::*;

	#[test]
	fn endpoint_parse() {
		let endpoint = NodeEndpoint::from_str("123.99.55.44:7770");
		assert!(endpoint.is_ok());
		let v4 = match endpoint.unwrap().address {
			SocketAddr::V4(v4address) => v4address,
			_ => panic!("should ve v4 address")
		};
		assert_eq!(SocketAddrV4::new(Ipv4Addr::new(123, 99, 55, 44), 7770), v4);
	}

	#[test]
	fn node_parse() {
		let node = Node::from_str("enode://a979fb575495b8d6db44f750317d0f4622bf4c2aa3365d6af7c284339968eef29b69ad0dce72a4d8db5ebb4968de0e3bec910127f134779fbcb0cb6d3331163c@22.99.55.44:7770");
		assert!(node.is_ok());
		let node = node.unwrap();
		let v4 = match node.endpoint.address {
			SocketAddr::V4(v4address) => v4address,
			_ => panic!("should ve v4 address")
		};
		assert_eq!(SocketAddrV4::new(Ipv4Addr::new(22, 99, 55, 44), 7770), v4);
		assert_eq!(
			H512::from_str("a979fb575495b8d6db44f750317d0f4622bf4c2aa3365d6af7c284339968eef29b69ad0dce72a4d8db5ebb4968de0e3bec910127f134779fbcb0cb6d3331163c").unwrap(),
			node.id);
	}
}