package datastructures

import "encoding/binary"

type Action uint8

const (
	ActionNul = Action(0)
	ActionSign = Action(1)
	ActionRevoke = Action(2)
)

func (a Action) String() string {
	switch a {
	case ActionNul:
		return "NUL"
    case ActionSign:
        return "SIGN"
    case ActionRevoke:
        return "REVOKE"
	default:
		return "unknown"
	}
}

func encode24BitLength(data []byte) []byte {
	lengthBytes := make([]byte, 4)
	binary.BigEndian.PutUint32(lengthBytes, uint32(len(data)))
	return lengthBytes[1:]
}

// calculate length from 24 bits of data in network byte order
func Decode24BitLength(bytes []byte) int {
	return int(binary.BigEndian.Uint32([]byte{0x0, bytes[0], bytes[1], bytes[2]}))
}

func CalculateXorCheckSum(byteBlocks [][]byte) byte {
	var result byte = 0x0
	for _, byteBlock := range byteBlocks {
		for _, b := range byteBlock {
			result ^= b
		}
	}
	return result
}