package hook

import (
	"bytes"
	"time"
	"tunnel/pkg/server/queue"
)

const bufDelay = 1 * time.Millisecond

func buffering(rq, wq queue.Q) error {
	for b := range rq {
		var w bytes.Buffer

		t := time.NewTimer(bufDelay)
		stop := false

		for !stop {
			select {
			case x := <-rq:
				if len(x) == 0 {
					stop = true
					break
				}

				if w.Len() == 0 {
					w.Write(b)
				}

				w.Write(x)

			case <-t.C:
				stop = true
			}
		}

		if w.Len() > 0 {
			wq <- w.Bytes()
		} else {
			wq <- b
		}

		t.Stop()
	}

	return nil
}

func init() {
	registerFunc("buf", "stream buffering out/", buffering)
}