package hotline

import (
	"bytes"
	"encoding/binary"
	"errors"
)

type Transfer struct {
	Protocol        [4]byte // "HTXF" 0x48545846
	ReferenceNumber [4]byte // Unique ID generated for the transfer
	DataSize        [4]byte // File size
	RSVD            [4]byte // Not implemented in Hotline Protocol
}

func NewReadTransfer(b []byte) (Transfer, error) {
	r := bytes.NewReader(b)
	var transfer Transfer

	if err := binary.Read(r, binary.BigEndian, &transfer); err != nil {
		return transfer, err
	}

	// 0x48545846 (HTXF) is the only supported transfer protocol
	if transfer.Protocol != [4]byte{0x48, 0x54, 0x58, 0x46} {
		return transfer, errors.New("invalid protocol")
	}

	return transfer, nil
}
//
//type FolderTransfer struct {
//	Protocol        [4]byte // "HTXF" 0x48545846
//	ReferenceNumber [4]byte // Unique ID generated for the transfer
//	DataSize        [4]byte // File size
//	RSVD            [4]byte // Not implemented in Hotline Protocol
//	Action          [2]byte // Next file action
//}
//
//func ReadFolderTransfer(b []byte) (FolderTransfer, error) {
//	r := bytes.NewReader(b)
//	var decodedEvent FolderTransfer
//
//	if err := binary.Read(r, binary.BigEndian, &decodedEvent); err != nil {
//		return decodedEvent, err
//	}
//
//	return decodedEvent, nil
//}