package mediadevices

type EncodedBuffer struct {
	Data    []byte
	Samples uint32
}

type EncodedReadCloser interface {
	Read() (EncodedBuffer, func(), error)
	Close() error
}

type encodedReadCloserImpl struct {
	readFn  func() (EncodedBuffer, func(), error)
	closeFn func() error
}

func (r *encodedReadCloserImpl) Read() (EncodedBuffer, func(), error) {
	return r.readFn()
}

func (r *encodedReadCloserImpl) Close() error {
	return r.closeFn()
}

type encodedIOReadCloserImpl struct {
	readFn  func([]byte) (int, error)
	closeFn func() error
}

func newEncodedIOReadCloserImpl(reader EncodedReadCloser) *encodedIOReadCloserImpl {
	var encoded EncodedBuffer
	release := func() {}
	return &encodedIOReadCloserImpl{
		readFn: func(b []byte) (int, error) {
			var err error

			if len(encoded.Data) == 0 {
				release()
				encoded, release, err = reader.Read()
				if err != nil {
					reader.Close()
					return 0, err
				}
			}

			n := copy(b, encoded.Data)
			encoded.Data = encoded.Data[n:]
			return n, nil
		},
		closeFn: reader.Close,
	}
}

func (r *encodedIOReadCloserImpl) Read(b []byte) (int, error) {
	return r.readFn(b)
}

func (r *encodedIOReadCloserImpl) Close() error {
	return r.closeFn()
}