package term

import (
	"bytes"
	"sync"
)

type NextWriter struct {
	b  bytes.Buffer
	mu sync.Mutex
}

func (w *NextWriter) Write(p []byte) (int, error) {
	w.mu.Lock()
	defer w.mu.Unlock()
	return w.b.Write(p)
}

func (w *NextWriter) Read() ([]byte, int, error) {
	w.mu.Lock()
	defer w.mu.Unlock()
	p := w.b.Bytes()
	buf := make([]byte, len(p))
	read, err := w.b.Read(buf)
	w.b.Reset()
	if err != nil {
		return nil, 0, err
	}
	return buf, read, err
}