//! A basic example. Mainly for use in a test, but also shows off some basic
//! functionality.
use std::{env, error::Error, fs};

use rmpv::Value;

use tokio::io::Stdout;

use nvim_rs::{
	compat::tokio::Compat, create::tokio as create, rpc::IntoVal, Handler, Neovim,
};
use tonic::async_trait;

#[derive(Clone)]
struct NeovimHandler {
	
}

#[async_trait]
impl Handler for NeovimHandler {
	type Writer = Compat<Stdout>;

	async fn handle_request(
		&self,
		name: String,
		args: Vec<Value>,
		nvim: Neovim<Compat<Stdout>>,
	) -> Result<Value, Value> {
		match name.as_ref() {
			"ping" => Ok(Value::from("pong")),
			_ => unimplemented!(),
		}
	}

	async fn handle_notify(
		&self,
		name: String,
		args: Vec<Value>,
		nvim: Neovim<Compat<Stdout>>,
	) {
	}
}

#[tokio::main]
async fn main() {
	let handler: NeovimHandler = NeovimHandler {};
	let (nvim, io_handler) = create::new_parent(handler).await;
	let curbuf = nvim.get_current_buf().await.unwrap();

	let mut envargs = env::args();
	let _ = envargs.next();
	let testfile = envargs.next().unwrap();

	fs::write(testfile, &format!("{:?}", curbuf.into_val())).unwrap();

	// Any error should probably be logged, as stderr is not visible to users.
	match io_handler.await {
		Err(joinerr) => eprintln!("Error joining IO loop: '{}'", joinerr),
		Ok(Err(err)) => {
			if !err.is_reader_error() {
				// One last try, since there wasn't an error with writing to the
				// stream
				nvim
					.err_writeln(&format!("Error: '{}'", err))
					.await
					.unwrap_or_else(|e| {
						// We could inspect this error to see what was happening, and
						// maybe retry, but at this point it's probably best
						// to assume the worst and print a friendly and
						// supportive message to our users
						eprintln!("Well, dang... '{}'", e);
					});
			}

			if !err.is_channel_closed() {
				// Closed channel usually means neovim quit itself, or this plugin was
				// told to quit by closing the channel, so it's not always an error
				// condition.
				eprintln!("Error: '{}'", err);

				let mut source = err.source();

				while let Some(e) = source {
					eprintln!("Caused by: '{}'", e);
					source = e.source();
				}
			}
		}
		Ok(Ok(())) => {}
	}
}