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use std::sync::mpsc::Sender;
use websocket::OwnedMessage;
use serde_json::Value;
use serde_json;

use message::Message;
use event::{Event, PhoenixEvent};

pub struct Channel {
    topic: String,
    tx: Sender<OwnedMessage>,
    reference: String,
}

impl Channel {
    pub fn new(topic: &str, tx: Sender<OwnedMessage>, reference: &str) -> Channel {
        Channel {
            topic: topic.to_owned(),
            tx,
            reference: reference.to_owned(),
        }
    }

    pub fn send(&mut self, event: Event, msg: Value) {
        let msg = Message {
            topic: self.topic.to_owned(),
            event,
            reference: Some(self.reference.to_owned()),
            join_ref: Some(self.reference.to_owned()),
            payload: msg.to_owned(),
        };

        self.tx
            .send(OwnedMessage::Text(serde_json::to_string(&msg).unwrap()))
            .unwrap();
    }

    pub fn join(&mut self) {
        let msg = Message {
            topic: self.topic.to_owned(),
            event: Event::Defined(PhoenixEvent::Join),
            reference: Some(self.reference.to_owned()),
            join_ref: Some(self.reference.to_owned()),
            payload: Value::Null,
        };
        self.tx
            .send(OwnedMessage::Text(serde_json::to_string(&msg).unwrap()))
            .unwrap();
    }
}