use crate::config::save_config;
use crate::ui_code::{AppState, SocketConnectionUpdate};
use crate::JoystickThreadUpdate;

use async_channel::{Receiver, Sender};
use gilrs::{ev::filter::FilterFn, Axis, Button, Event, EventType, Filter, Gilrs, GilrsBuilder};
use std::panic::{self, AssertUnwindSafe};
use std::{
    sync::{atomic::AtomicBool, Arc},
    time::{Duration, Instant},
};
use websocket::client::{sync::Client, ClientBuilder};
use websocket::Message;

struct UnknownSlayer;

impl FilterFn for UnknownSlayer {
    fn filter(&self, ev: Option<Event>, _gilrs: &mut Gilrs) -> Option<Event> {
        match ev {
            Some(Event {
                event: EventType::ButtonPressed(Button::Unknown, ..),
                id,
                ..
            })
            | Some(Event {
                event: EventType::ButtonReleased(Button::Unknown, ..),
                id,
                ..
            })
            | Some(Event {
                event: EventType::AxisChanged(Axis::Unknown, ..),
                id,
                ..
            }) => Some(Event::new(id, EventType::Dropped)),
            _ => ev,
        }
    }
}

pub fn joystick_websocket_loop(
    tx: Sender<JoystickThreadUpdate>,
    do_run: Arc<AtomicBool>,
    rx: Receiver<SocketConnectionUpdate>,
) {
    let mut gilrs = GilrsBuilder::new().set_update_state(false).build().unwrap();

    let mut ip: String;
    let mut port: u32;

    let mut websocket: Option<Client<websocket::stream::sync::TcpStream>> = None;

    let mut curr_x: i32 = 0;
    let mut curr_y: i32 = 0;

    let mut last_update_time = Instant::now();

    loop {
        match rx.try_recv() {
            Ok(msg) => {
                ip = msg.ip;
                port = msg.port;

                save_config(&AppState {
                    ip: ip.clone(),
                    port,
                });

                println!("ws://{}:{}", ip, port);

                if let Some(mut x) = websocket {
                    println!("closing websocket");
                    x.send_message(&Message::close()).unwrap();
                    x.shutdown().unwrap();
                    websocket = None;
                } else {
                    websocket = {
                        if let Ok(mut val) =
                            ClientBuilder::new(format!("ws://{}:{}", ip, port).as_str())
                        {
                            if let Ok(val2) = val.connect_insecure() {
                                Some(val2)
                            } else {
                                println!("couldn't connect websocket! : Step 1");
                                None
                            }
                        } else {
                            println!("couldn't connect websocket! : Step 2");
                            None
                        }
                    };
                }
            }
            Err(async_channel::TryRecvError::Closed) => break,
            Err(async_channel::TryRecvError::Empty) => {}
        }

        match panic::catch_unwind(AssertUnwindSafe(|| {
            while let Some(evt) = gilrs.next_event().filter_ev(&UnknownSlayer {}, &mut gilrs) {
                match evt.event {
                    gilrs::EventType::AxisChanged(gilrs::Axis::LeftStickY, val, _) => {
                        curr_y = (val * 100.0) as i32;
                        if curr_y > -10 && curr_y < 10 {
                            curr_y = 0;
                        }
                    }
                    gilrs::EventType::AxisChanged(gilrs::Axis::LeftStickX, val, _) => {
                        curr_x = (val * 100.0) as i32;
                        if curr_x > -10 && curr_x < 10 {
                            curr_x = 0;
                        }
                    }
                    _ => {}
                }
            }
        })) {
            Ok(_) => {}
            Err(_) => {
                println!("panic-causing event captured")
            }
        }

        if websocket.is_some()
            && Instant::now().duration_since(last_update_time) >= Duration::from_millis(150)
        {
            let mut message: String;
            if curr_y > 0 {
                message = format!("D{}:", curr_y);
            } else {
                message = format!("U{}:", curr_y.abs());
            }

            if curr_x > 0 {
                message.push_str(&format!("R{}", curr_x));
            } else {
                message.push_str(&format!("L{}", curr_x.abs()));
            }

            if let Some(mut websocket_tx) = websocket {
                websocket_tx.send_message(&Message::text(message)).unwrap();
                websocket = Some(websocket_tx);
            }
            last_update_time = Instant::now();
            continue;
        }

        match tx.try_send(JoystickThreadUpdate {
            connected: websocket.is_some(),
            x_axis: Some(curr_x.to_string()),
            y_axis: Some(curr_y.to_string()),
        }) {
            Ok(_) => {}
            Err(async_channel::TrySendError::Closed(_)) => break,
            Err(async_channel::TrySendError::Full(_)) => {}
        }

        if !do_run.load(std::sync::atomic::Ordering::SeqCst) {
            println!("Exiting thread");
            break;
        }
        std::thread::sleep(Duration::from_millis(25));
    }
}