use std::{net::SocketAddr, result, sync::Arc, thread::{self, sleep}, time::Duration};

use image::{ImageBuffer, Rgb};
use nokhwa::{pixel_format::RgbFormat, utils::{ApiBackend, RequestedFormat, RequestedFormatType, Resolution}, Camera};
use anyhow::{Context, Ok, Result};
use openh264::{encoder::Encoder, formats::{RgbSliceU8, YUVBuffer}, nal_units};
use tokio::{io::AsyncWriteExt, net::{TcpListener, TcpStream}, runtime::Runtime, sync::{Notify, RwLock}, task::LocalSet};

fn main() -> Result<()>{
    let await_frame = Arc::new(Notify::new());
    let latest_frame = Arc::new(RwLock::new(YUVBuffer::new(0, 0)));

    {
        let runtime = Runtime::new()?;
        let await_frame = await_frame.clone();
        let latest_frame = latest_frame.clone();
        thread::spawn(move || {
            let local = LocalSet::new();
            local.block_on(&runtime, camera_manager(await_frame, latest_frame)).unwrap();
        });
    }

    {
        let runtime = Runtime::new()?;
        let await_frame = await_frame.clone();
        let latest_frame = latest_frame.clone();
        thread::spawn(move || {
            let local = LocalSet::new();
            local.block_on(&runtime, server(await_frame, latest_frame)).unwrap();
        });
    }


    loop {}
}

async fn camera_manager(await_frame: Arc<Notify>, latest_frame: Arc<RwLock<YUVBuffer>>) -> Result<()>{
    let cameras = nokhwa::query(ApiBackend::Auto)?;

    let camera = cameras.get(0).context("no cameras")?;
    println!("using: {}",camera.human_name());

    let requested = RequestedFormat::new::<RgbFormat>(RequestedFormatType::HighestResolution(Resolution::new(320, 240)));

    let mut camera = Camera::new(camera.index().clone(), requested)?;
    camera.open_stream()?;

    loop {
        let frame = camera.frame()?;
        let resolution = frame.resolution();
        let frame: ImageBuffer<Rgb<u8>, Vec<u8>> = frame.decode_image::<RgbFormat>()?;
        let buf = RgbSliceU8::new(frame.as_raw(), (resolution.width_x as usize, resolution.height_y as usize));
        let yuv = YUVBuffer::from_rgb8_source(buf);

        *latest_frame.write().await = yuv;
        await_frame.notify_waiters();
    }
}

async fn stream_video(await_frame: Arc<Notify>, latest_frame: Arc<RwLock<YUVBuffer>>, mut client: TcpStream) -> Result<()>{
    let mut encoder = Encoder::new()?;

    loop {
        await_frame.notified().await;
        let data = encoder.encode(&*latest_frame.read().await)?;
        let data = data.to_vec();
        println!("len: {}", data.len());

        let len = data.len();

        let data2 = data.clone();
        drop(data);
        client.write(&data2).await?;
        client.write_u32(len as u32).await?;
    }
}

async fn server(await_frame: Arc<Notify>, latest_frame: Arc<RwLock<YUVBuffer>>) -> Result<()> {
    let port = 2993;
    let listener = TcpListener::bind(format!("0.0.0.0:{port}")).await?;
    println!("listening on {port}");

    while let result::Result::Ok((client, addr)) = listener.accept().await {
        println!("connected to {:?}", addr);

        tokio::task::spawn_local(stream_video(await_frame.clone(), latest_frame.clone(), client)); 
    }

    Ok(())
}