package types

import (
	"fmt"

	"archgrid.xyz/ag/toolsbox/hash/crc16"
)

type CRC16Algorithm string

const (
	CRC16_CCITT       CRC16Algorithm = "ccitt"
	CRC16_CCITT_FALSE CRC16Algorithm = "ccitt-false"
	CRC16_SCSI        CRC16Algorithm = "scsi"
	CRC16_IBM         CRC16Algorithm = "ibm"
	CRC16_MBUS        CRC16Algorithm = "mbus"
)

func (a *CRC16Algorithm) String() string {
	return string(*a)
}

func (a *CRC16Algorithm) Set(s string) error {
	switch s {
	case "ccitt", "ccitt-false", "scsi", "ibm", "mbus":
		*a = CRC16Algorithm(s)
		return nil
	default:
		return fmt.Errorf("不支持的CRC16算法：%s", s)
	}
}

func (a *CRC16Algorithm) Type() string {
	return "CRC16Algorithm"
}

func (a CRC16Algorithm) IntoCRC16Mode() crc16.CRC16Mode {
	switch a {
	case CRC16_CCITT:
		return crc16.CCITT
	case CRC16_CCITT_FALSE:
		return crc16.CCITT_FALSE
	case CRC16_SCSI:
		return crc16.SCSI
	case CRC16_IBM:
		return crc16.IBM
	case CRC16_MBUS:
		return crc16.MBUS
	default:
		return crc16.IBM
	}
}