package types

import (
	"fmt"

	"archgrid.xyz/ag/toolsbox/hash/crc32"
)

type CRC32Algorithm string

const (
	CRC32_IEEE       CRC32Algorithm = "ieee"
	CRC32_CASTAGNOLI CRC32Algorithm = "castagnoli"
	CRC32_KOOPMAN    CRC32Algorithm = "koopman"
)

func (a *CRC32Algorithm) String() string {
	return string(*a)
}

func (a *CRC32Algorithm) Set(s string) error {
	switch s {
	case "ieee", "castagnoli", "koopman":
		*a = CRC32Algorithm(s)
		return nil
	default:
		return fmt.Errorf("不支持的CRC32算法：%s", s)
	}
}

func (a *CRC32Algorithm) Type() string {
	return "CRC32Algorithm"
}

func (a CRC32Algorithm) IntoCRC32Mode() crc32.CRC32Mode {
	switch a {
	case CRC32_IEEE:
		return crc32.IEEE
	case CRC32_CASTAGNOLI:
		return crc32.Castagnoli
	case CRC32_KOOPMAN:
		return crc32.Koopman
	default:
		return crc32.IEEE
	}
}