use futures::stream::StreamExt;
use std::convert::TryFrom;
use std::env::args;
use std::process::exit;
use tokio;
use tokio_xmpp::Client;
use xmpp_parsers::message::{Body, Message, MessageType};
use xmpp_parsers::presence::{Presence, Show as PresenceShow, Type as PresenceType};
use xmpp_parsers::{Element, Jid};

#[tokio::main]
async fn main() {
    let args: Vec<String> = args().collect();
    if args.len() != 3 {
        println!("Usage: {} <jid> <password>", args[0]);
        exit(1);
    }
    let jid = &args[1];
    let password = &args[2];

    // Client instance
    let mut client = Client::new(jid, password.to_owned()).unwrap();
    client.set_reconnect(true);

    // Main loop, processes events
    let mut wait_for_stream_end = false;
    let mut stream_ended = false;
    while !stream_ended {
        if let Some(event) = client.next().await {
            println!("event: {:?}", event);
            if wait_for_stream_end {
                /* Do nothing */
            } else if event.is_online() {
                let jid = event
                    .get_jid()
                    .map(|jid| format!("{}", jid))
                    .unwrap_or("unknown".to_owned());
                println!("Online at {}", jid);

                let presence = make_presence();
                client.send_stanza(presence).await.unwrap();
            } else if let Some(message) = event
                .into_stanza()
                .and_then(|stanza| Message::try_from(stanza).ok())
            {
                match (message.from, message.bodies.get("")) {
                    (Some(ref from), Some(ref body)) if body.0 == "die" => {
                        println!("Secret die command triggered by {}", from);
                        wait_for_stream_end = true;
                        client.send_end().await.unwrap();
                    }
                    (Some(ref from), Some(ref body)) => {
                        if message.type_ != MessageType::Error {
                            // This is a message we'll echo
                            let reply = make_reply(from.clone(), &body.0);
                            client.send_stanza(reply).await.unwrap();
                        }
                    }
                    _ => {}
                }
            }
        } else {
            println!("stream_ended");
            stream_ended = true;
        }
    }
}

// Construct a <presence/>
fn make_presence() -> Element {
    let mut presence = Presence::new(PresenceType::None);
    presence.show = Some(PresenceShow::Chat);
    presence
        .statuses
        .insert(String::from("en"), String::from("Echoing messages."));
    presence.into()
}

// Construct a chat <message/>
fn make_reply(to: Jid, body: &str) -> Element {
    let mut message = Message::new(Some(to));
    message.bodies.insert(String::new(), Body(body.to_owned()));
    message.into()
}