package rsa

import (
	"fmt"
	"os"

	"archgrid.xyz/ag/toolsbox/encryption/rsa"
	"github.com/spf13/cobra"
)

var (
	rsaKeyOutputFile string
)

var keyGenCmd = &cobra.Command{
	Use:   "keygen",
	Short: "生成RSA密钥对",
	Long:  `生成RSA密钥对，密钥对将会被保存到指定的文件中。`,
	Args:  cobra.NoArgs,
	Run:   keyGenExecute,
}

func keyGenExecute(cmd *cobra.Command, args []string) {
	if len(rsaKeyOutputFile) == 0 {
		fmt.Println("必须指定密钥输出文件名的前缀。")
		return
	}
	keyPair, err := rsa.NewKeyPair(rsaKeyLength.IntoRSAKeyLength())
	if err != nil {
		fmt.Printf("无法生成RSA密钥对：%s\n", err)
		return
	}
	privateKeyBytes, err := rsa.EncodePrivateKey(keyPair.PrivateKey)
	if err != nil {
		fmt.Printf("无法编码RSA私钥：%s\n", err)
		return
	}
	privateKeyFile, err := os.OpenFile(rsaKeyOutputFile+".pri.pem", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
	if err != nil {
		fmt.Printf("无法创建RSA私钥文件：%s\n", err)
		return
	}
	defer privateKeyFile.Close()
	_, err = privateKeyFile.Write(privateKeyBytes)
	if err != nil {
		fmt.Printf("无法写入RSA私钥文件：%s\n", err)
		return
	}
	publicKeyBytes, err := rsa.EncodePublicKey(keyPair.PublicKey)
	if err != nil {
		fmt.Printf("无法编码RSA公钥：%s\n", err)
		return
	}
	publicKeyFile, err := os.OpenFile(rsaKeyOutputFile+".pub.pem", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
	if err != nil {
		fmt.Printf("无法创建RSA公钥文件：%s\n", err)
		return
	}
	defer publicKeyFile.Close()
	_, err = publicKeyFile.Write(publicKeyBytes)
	if err != nil {
		fmt.Printf("无法写入RSA公钥文件：%s\n", err)
		return
	}
	fmt.Printf("RSA密钥对已经保存到文件：%s.pri.pem, %s.pub.pem\n", rsaKeyOutputFile, rsaKeyOutputFile)
}

func init() {
	keyGenCmd.Flags().StringVarP(&rsaKeyOutputFile, "output", "o", "", "用于保存密钥输出文件名的前缀。")
	rsaCmd.AddCommand(keyGenCmd)
}