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use std::fs::File;
use std::io::prelude::*;

extern crate notify_rust;
extern crate toml;
extern crate websocket;
extern crate rustc_serialize;
use notify_rust::Notification;

mod message;
use message::{Message, Push};

use websocket::Sender;
use websocket::Receiver;
use websocket::WebSocketStream;
use websocket::DataFrame;
use websocket::Client;

struct PBClient {
    client: websocket::client::Client<websocket::dataframe::DataFrame,
                                      websocket::client::sender::Sender<websocket::stream::WebSocketStream>,
                                      websocket::client::receiver::Receiver<websocket::stream::WebSocketStream>>
}

impl PBClient {
    fn new(token: &str) -> PBClient {
        use websocket::client::request::Url;
        use websocket::Client;

        let wss_url = format!("wss://stream.pushbullet.com/websocket/{}", token);
        let url = Url::parse(wss_url.as_ref()).unwrap();
        let request = Client::connect(url).unwrap();
        let response = request.send().unwrap();
        response.validate().unwrap();

        PBClient {
            client: response.begin()
        }
    }

    fn process_message(message: Result<websocket::Message, websocket::result::WebSocketError>) -> Option<Message> {
        let message = match message {
            Ok(m) => m,
            Err(e) => {
                println!("Error: {:?}", e);
                return None;
            }
        };

        if let websocket::Message::Text(message) = message {
                Message::parse(message.as_ref())
        }
        else {
            None
        }
    }

    fn messages<'a>(&'a mut self) -> Box<Iterator<Item=Message> + 'a> {
        let mut receiver = self.client.get_mut_reciever(); // there is a typo in the API
        Box::new(receiver.incoming_messages().filter_map(PBClient::process_message))
    }
}

fn main() {
    let mut cfg_file = File::open("config.toml").expect("Could not find config.toml.");
    let mut s = String::new();
    cfg_file.read_to_string(&mut s).expect("Could not read config.toml");
    let cfg = toml::Parser::new(s.as_ref()).parse().unwrap();
    let cfg_pb = cfg.get("pushbullet")
        .expect("Could not find [pushbullet] section in config.")
        .as_table()
        .expect("Config should contain a [pushbullet] section.");
    let token = cfg_pb.get("token")
        .expect("[pushbullet] section should contain 'token'")
        .as_str()
        .expect("'token' should be a string");

    let mut client = PBClient::new(token.as_ref());
    let mut receiver = client.client.get_mut_reciever();

    for message in receiver.incoming_messages() {
        let message = match message {
            Ok(m) => m,
            Err(e) => {
                println!("Error: {:?}", e);
                return;
            }
        };

        match message {
            websocket::Message::Close(_) => {
                return;
            }
            websocket::Message::Text(message) => {
                let msg = Message::parse(message.as_ref());
                if let Some(msg) = msg {
                    match msg {
                        Message::Push(Push::Mirror {
                            title,
                            body,
                            application_name,
                            ..
                        }) => {
                            let title = format!("{}: {}", application_name, title);
                            Notification::new()
                                .body(body.as_ref())
                                .summary(title.as_ref())
                                .show()
                                .unwrap();
                        }
                        _ => {}
                    }
                }
            }
            _ => {
                println!("Got {:?}", message);
            }
        }
    }
}