package cmd

import (
	"fmt"
	"strings"

	"archgrid.xyz/ag/tools/types"
	"archgrid.xyz/ag/toolsbox/hash/crc32"
	"github.com/spf13/cobra"
)

var (
	crc32Algorithm types.CRC32Algorithm = types.CRC32_IEEE
	crc32Endian    types.Endian         = types.LittleEndian
	crc32File      bool
)

var crc32Cmd = &cobra.Command{
	Use:   "crc32",
	Short: `CRC32校验`,
	Long:  `对给定的内容进行CRC32校验计算。`,
	Args:  cobra.MinimumNArgs(1),
	Run:   crc32Execute,
}

func crc32Execute(cmd *cobra.Command, args []string) {
	var (
		result []byte
		err    error
	)
	if crc32File {
		result, err = crc32.SumFile(args[0], crc32Algorithm.IntoCRC32Mode())
	} else {
		result = crc32.CRC32([]byte(args[0]), crc32Algorithm.IntoCRC32Mode())
	}
	if err != nil {
		fmt.Printf("计算CRC32校验值时发生错误：%s\n", err)
		return
	}
	if crc32Endian == types.LittleEndian {
		for i, j := 0, len(result)-1; i < j; i, j = i+1, j-1 {
			result[i], result[j] = result[j], result[i]
		}
	}
	var builder strings.Builder
	for _, b := range result {
		builder.WriteString(fmt.Sprintf(" %02X", b))
	}
	fmt.Printf("CRC32校验值：%s\n", builder.String())
}

func init() {
	crc32Cmd.PersistentFlags().VarP(&crc32Algorithm, "algorithm", "a", "CRC32算法，可选值有：ieee, castagnoli, koopman，缺省值为ieee。")
	crc32Cmd.PersistentFlags().VarP(&crc32Endian, "endian", "e", "字节序，可选值有：big, little，缺省值为little。")
	crc32Cmd.PersistentFlags().BoolVarP(&crc32File, "file", "f", false, "从文件中读取内容")
	rootCmd.AddCommand(crc32Cmd)
}