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use std::future::poll_fn;
use std::task::Poll;

use tokio::io::*;
use tokio::net::tcp::{OwnedReadHalf, OwnedWriteHalf};
use tokio::net::TcpStream;
use tokio::sync::Mutex;

use super::commands::stream_mapper::CommandToByteMapper;
use super::commands::Command;
use super::events::stream_mapper::*;
use super::events::Event;

type EventClosure = dyn FnMut(&Event) + Sync + Send + 'static;
type EventClosureMutex = Box<EventClosure>;

pub fn event_handler<F>(f: F) -> EventClosureMutex
where
    F: FnMut(&Event) + Sync + Send + 'static,
{
    Box::new(f)
}

pub struct FlicClient {
    reader: Mutex<OwnedReadHalf>,
    writer: Mutex<OwnedWriteHalf>,
    is_running: Mutex<bool>,
    command_mapper: Mutex<CommandToByteMapper>,
    event_mapper: Mutex<ByteToEventMapper>,
    map: Mutex<Vec<EventClosureMutex>>,
}

impl FlicClient {
    pub async fn new(conn: &str) -> Result<FlicClient> {
        TcpStream::connect(conn)
            .await
            .map(|s| s.into_split())
            .map(|(reader, writer)| FlicClient {
                reader: Mutex::new(reader),
                writer: Mutex::new(writer),
                is_running: Mutex::new(true),
                command_mapper: Mutex::new(CommandToByteMapper::new()),
                event_mapper: Mutex::new(ByteToEventMapper::new()),
                map: Mutex::new(vec![]),
            })
    }
    pub async fn register_event_handler(self, event: EventClosureMutex) -> Self {
        self.map.lock().await.push(event);
        self
    }

    // pub async fn listen_old(&self) {
    //     while *self.is_running.lock().await {
    //         let mut reader = self.reader.lock().await;
    //         if let Ok(size) = poll_fn(|cx| {
    //             let mut buf = [0; 1];
    //             let mut read_buf = ReadBuf::new(&mut buf);
    //             match reader.poll_peek(cx, &mut read_buf) {
    //                 Poll::Pending => Poll::Ready(Ok(0_usize)),
    //                 Poll::Ready(all) => Poll::Ready(all),
    //             }
    //         })
    //         .await
    //         {
    //             if size > 0 {
    //                 let mut buffer = vec![];
    //                 if let Some(_) = reader.read_buf(&mut buffer).await.ok() {
    //                     for b in buffer.iter() {
    //                         match self.event_mapper.lock().await.map(*b) {
    //                             EventResult::Some(Event::NoOp) => {}
    //                             EventResult::Some(event) => {
    //                                 let mut map = self.map.lock().await;
    //                                 for ref mut f in &mut *map {
    //                                     f(&event);
    //                                 }
    //                             }
    //                             _ => {}
    //                         }
    //                     }
    //                 }
    //             }
    //         }
    //     }
    // }

    pub async fn listen(&self) {
        while *self.is_running.lock().await {
            let mut reader = self.reader.lock().await;
            let mut buffer = vec![0; 2048];

            let size = reader.read(&mut buffer).await;

            match size {
                Ok(size) if size > 0 => {
                    buffer.truncate(size);
                    for b in buffer.iter() {
                        match self.event_mapper.lock().await.map(*b) {
                            EventResult::Some(Event::NoOp) => {}
                            EventResult::Some(event) => {
                                let mut map = self.map.lock().await;
                                for ref mut f in &mut *map {
                                    f(&event);
                                }
                            }
                            _ => {}
                        }
                    }
                }
                Ok(_) => {
                    tokio::time::sleep(tokio::time::Duration::from_millis(10)).await;
                }
                Err(e) => {
                    eprintln!("Error reading from reader: {}", e);
                    break;
                }
            }
        }
    }

    pub async fn stop(&self) {
        *self.is_running.lock().await = false;
    }

    pub async fn submit(&self, cmd: Command) {
        let mut writer = self.writer.lock().await;
        for b in self.command_mapper.lock().await.map(cmd) {
            let _ = writer.write_u8(b).await;
        }
    }
}