use std::{fmt, time::SystemTime};

use conduwuit::Result;
use conduwuit_service::Services;
use futures::{
	io::{AsyncWriteExt, BufWriter},
	lock::Mutex,
	Future, FutureExt,
};
use ruma::EventId;

pub(crate) struct Command<'a> {
	pub(crate) services: &'a Services,
	pub(crate) body: &'a [&'a str],
	pub(crate) timer: SystemTime,
	pub(crate) reply_id: Option<&'a EventId>,
	pub(crate) output: Mutex<BufWriter<Vec<u8>>>,
}

impl Command<'_> {
	pub(crate) fn write_fmt(
		&self,
		arguments: fmt::Arguments<'_>,
	) -> impl Future<Output = Result> + Send + '_ {
		let buf = format!("{arguments}");
		self.output.lock().then(|mut output| async move {
			output.write_all(buf.as_bytes()).await.map_err(Into::into)
		})
	}

	pub(crate) fn write_str<'a>(
		&'a self,
		s: &'a str,
	) -> impl Future<Output = Result> + Send + 'a {
		self.output.lock().then(move |mut output| async move {
			output.write_all(s.as_bytes()).await.map_err(Into::into)
		})
	}
}