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use processor::{OutputProcessor, ConfigurableFilter};

use std::collections::HashMap;
use std::sync::mpsc::Receiver;
use std::thread::JoinHandle;

use std::net::UdpSocket;

/// # Network output
///
/// - sends output on the network using UDP
///
/// ### catapult.conf
///
/// ```
/// output {
/// 	network {
/// 		destination = "127.0.0.1"
/// 		port = 12121
/// 	}
/// }
/// ```
/// ### Parameters
///
/// - **destination**: IP/name Destination
/// - **port**: Destination Port


pub struct Network {
  name: String
}

impl Network {
  pub fn new(name: String) -> Network {
    Network{ name: name }
  }
}

impl ConfigurableFilter for Network {
  fn human_name(&self) -> &str {
    self.name.as_ref()
  }

  fn mandatory_fields(&self) -> Vec<&str> {
    vec!["destination", "port"]
  }
}

impl OutputProcessor for Network {
  fn start(&self, rx:Receiver<String>, config: &Option<HashMap<String,String>>)  -> Result<JoinHandle<()>, String> {
    self.requires_fields(config, self.mandatory_fields());
    self.invoke(rx, config, Network::handle_func)
  }
  fn handle_func(rx: Receiver<String>, oconfig: Option<HashMap<String,String>>) {
    let config = oconfig.expect("Need a configuration");

    let destination_ip = config.get("destination").expect("Need a destination IP").clone();
    let destination_port = config.get("port").expect("Need a destination port").parse::<u32>().unwrap();

    let udp = UdpSocket::bind("0.0.0.0:0").unwrap();
    let dest = format!("{}:{}", destination_ip, destination_port);

    loop {
      match rx.recv() {
        Ok(l) => {
          udp.send_to(l.as_bytes(), &*dest).unwrap();
        },
        Err(e) => { panic!(e) }
      }
    }
  }
}