use std::{env, process::exit};
use url::Url;

use matrix_sdk::{
    self, async_trait,
    events::{
        room::message::{MessageEventContent, TextMessageEventContent},
        SyncMessageEvent,
    },
    Client, EventHandler, RoomState, SyncSettings,
};

struct EventCallback;

#[async_trait]
impl EventHandler for EventCallback {
    async fn on_room_message(
        &self,
        room: RoomState,
        event: &SyncMessageEvent<MessageEventContent>,
    ) {
        if let RoomState::Joined(room) = room {
            if let SyncMessageEvent {
                content: MessageEventContent::Text(TextMessageEventContent { body: msg_body, .. }),
                sender,
                ..
            } = event
            {
                let member = room.get_member(&sender).await.unwrap().unwrap();
                let name = member
                    .display_name()
                    .unwrap_or_else(|| member.user_id().as_str());
                println!("{}: {}", name, msg_body);
            }
        }
    }
}

async fn login(
    homeserver_url: String,
    username: &str,
    password: &str,
) -> Result<(), matrix_sdk::Error> {
    let homeserver_url = Url::parse(&homeserver_url).expect("Couldn't parse the homeserver URL");
    let client = Client::new(homeserver_url).unwrap();

    client.set_event_handler(Box::new(EventCallback)).await;

    client
        .login(username, password, None, Some("rust-sdk"))
        .await?;
    client.sync(SyncSettings::new()).await;

    Ok(())
}

#[tokio::main]
async fn main() -> Result<(), matrix_sdk::Error> {
    tracing_subscriber::fmt::init();

    let (homeserver_url, username, password) =
        match (env::args().nth(1), env::args().nth(2), env::args().nth(3)) {
            (Some(a), Some(b), Some(c)) => (a, b, c),
            _ => {
                eprintln!(
                    "Usage: {} <homeserver_url> <username> <password>",
                    env::args().next().unwrap()
                );
                exit(1)
            }
        };

    login(homeserver_url, &username, &password).await
}