package cmd

import (
	"fmt"

	"archgrid.xyz/ag/tools/types"
	"archgrid.xyz/ag/toolsbox/encryption"
	"archgrid.xyz/ag/toolsbox/encryption/des"
	"archgrid.xyz/ag/toolsbox/serialize/base64"
	"archgrid.xyz/ag/toolsbox/serialize/hex"
	"github.com/spf13/cobra"
)

var (
	desKey     string
	desResult  types.ResultEncoding    = types.ResultInHex
	desPadding types.EncryptionPadding = types.PKCS7Padding
)

var desCommand = &cobra.Command{
	Use:   "des",
	Short: "DES加密算法工具",
	Long:  `使用DES加密算法加密或解密数据，在使用的时候注意明文和密文中如果包含空格或特殊字符，需要使用双引号包裹起来。`,
}

var desEncryptCmd = &cobra.Command{
	Use:   "encrypt",
	Short: "使用DES加密算法加密",
	Long:  `使用DES加密算法加密，支持三种填充方式：PKCS7、Zero和无填充。默认输出十六进制编码字符串。`,
	Args:  cobra.MinimumNArgs(1),
	Run:   desEncryptExecute,
}

var desDecryptCmd = &cobra.Command{
	Use:   "decrypt",
	Short: "使用DES加密算法解密",
	Long:  `使用DES加密算法解密，支持三种填充方式：PKCS7、Zero和无填充。默认输入十六进制编码字符串。`,
	Args:  cobra.MinimumNArgs(1),
	Run:   desDecryptExecute,
}

func desEncryptExecute(cmd *cobra.Command, args []string) {
	var pad encryption.PaddingMode
	switch desPadding {
	case types.PKCS7Padding:
		pad = encryption.PKCS7Padding
	case types.ZeroPadding:
		pad = encryption.ZeroPadding
	case types.NoPadding:
		pad = encryption.NoPadding
	default:
		fmt.Printf("不支持的填充方式：%s\n", desPadding)
		return
	}
	encodedResult, err := des.Encrypt([]byte(args[0]), []byte(desKey), pad)
	if err != nil {
		fmt.Printf("加密失败：%s\n", err)
		return
	}
	switch desResult {
	case types.ResultInBase64:
		fmt.Printf("加密结果：%s\n", base64.ToBase64URLEncoded(encodedResult))
	case types.ResultInHex:
		fallthrough
	default:
		fmt.Printf("加密结果：%s\n", hex.ToHex(encodedResult))
	}
}

func desDecryptExecute(cmd *cobra.Command, args []string) {
	var pad encryption.PaddingMode
	switch desPadding {
	case types.PKCS7Padding:
		pad = encryption.PKCS7Padding
	case types.ZeroPadding:
		pad = encryption.ZeroPadding
	case types.NoPadding:
		pad = encryption.NoPadding
	default:
		fmt.Printf("不支持的填充方式：%s\n", desPadding)
		return
	}
	var (
		data []byte
		err  error
	)
	switch desResult {
	case types.ResultInBase64:
		data, err = base64.FromBase64(args[0])
	case types.ResultInHex:
		fallthrough
	default:
		data, err = hex.FromHex(args[0])
	}
	if err != nil {
		fmt.Printf("解密失败，提供的密文无法解析，%s\n", err)
		return
	}
	decodedResult, err := des.Decrypt(data, []byte(desKey), pad)
	if err != nil {
		fmt.Printf("解密失败，%s\n", err)
		return
	}
	fmt.Printf("解密结果：%s\n", decodedResult)
}

func init() {
	desCommand.PersistentFlags().VarP(&desResult, "output", "o", "密文的编码方式，可选Base64或者Hex，同时对加密和解密过程有效，默认使用Hex编码。")
	desCommand.PersistentFlags().StringVarP(&desKey, "key", "k", "", "密钥。")
	desCommand.PersistentFlags().VarP(&desPadding, "padding", "p", "填充方式，支持pkcs7、zero和none，默认为pkcs7。")
	desCommand.AddCommand(desEncryptCmd, desDecryptCmd)
	rootCmd.AddCommand(desCommand)
}