use std::{
    env,
    fs::File,
    io::{Seek, SeekFrom},
    path::PathBuf,
    process::exit,
    sync::Arc,
};

use matrix_sdk::{
    self,
    room::Room,
    ruma::events::{
        room::message::{MessageEventContent, MessageType, TextMessageEventContent},
        SyncMessageEvent,
    },
    Client, SyncSettings,
};
use tokio::sync::Mutex;
use url::Url;

async fn on_room_message(
    event: SyncMessageEvent<MessageEventContent>,
    room: Room,
    image: Arc<Mutex<File>>,
) {
    if let Room::Joined(room) = room {
        let msg_body = if let SyncMessageEvent {
            content:
                MessageEventContent {
                    msgtype: MessageType::Text(TextMessageEventContent { body: msg_body, .. }),
                    ..
                },
            ..
        } = event
        {
            msg_body
        } else {
            return;
        };

        if msg_body.contains("!image") {
            println!("sending image");
            let mut image = image.lock().await;

            room.send_attachment("cat", &mime::IMAGE_JPEG, &mut *image, None).await.unwrap();

            image.seek(SeekFrom::Start(0)).unwrap();

            println!("message sent");
        }
    }
}

async fn login_and_sync(
    homeserver_url: String,
    username: String,
    password: String,
    image: File,
) -> 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.login(&username, &password, None, Some("command bot")).await?;

    client.sync_once(SyncSettings::default()).await.unwrap();

    let image = Arc::new(Mutex::new(image));
    client.register_event_handler(move |ev, room| on_room_message(ev, room, image.clone())).await;

    let settings = SyncSettings::default().token(client.sync_token().await.unwrap());
    client.sync(settings).await;

    Ok(())
}

#[tokio::main]
async fn main() -> Result<(), matrix_sdk::Error> {
    tracing_subscriber::fmt::init();
    let (homeserver_url, username, password, image_path) =
        match (env::args().nth(1), env::args().nth(2), env::args().nth(3), env::args().nth(4)) {
            (Some(a), Some(b), Some(c), Some(d)) => (a, b, c, d),
            _ => {
                eprintln!(
                    "Usage: {} <homeserver_url> <username> <password> <image>",
                    env::args().next().unwrap()
                );
                exit(1)
            }
        };

    println!("helloooo {} {} {} {:#?}", homeserver_url, username, password, image_path);
    let path = PathBuf::from(image_path);
    let image = File::open(path).expect("Can't open image file.");

    login_and_sync(homeserver_url, username, password, image).await?;
    Ok(())
}