package main

import (
	"bufio"
	"fmt"
	"os"

	"git.pspay.io/crypto-stories/custodial/pkg/crypto"
)

var KEY_DIR string = os.Getenv("KEYPAIR_DIR")

func main() {
	var command string = ""
	if len(os.Args) > 1 {
		command = os.Args[1]
	}

	switch command {
	case "generate":
		if len(os.Args) < 3 {
			fmt.Println("Usage: keypair generate <dir>")
			os.Exit(1)
		}
		kp, err := crypto.KeyPair{}.Random()
		if err != nil {
			panic(err)
		}
		kp.Save(os.Args[2])
	case "encrypt":
		EnvWarn()
		kp := crypto.KeyPair{}.Load(KEY_DIR)
		pub := kp.PublicKeyBase64()
		NoPipe(func() {
			fmt.Println("Enter a string to encrypt:")
			fmt.Println("")
		})
		reader := bufio.NewReader(os.Stdin)
		text, _ := reader.ReadString('\n')
		NoPipe(func() {
			fmt.Println("Result:")
			fmt.Println("")
		})
		fmt.Println(pub.EncryptToString(text))
	case "decrypt":
		EnvWarn()
		kp := crypto.KeyPair{}.Load(KEY_DIR)
		priv := kp.PrivateKeyBase64()
		NoPipe(func() {
			fmt.Println("Enter a string to decrypt:")
			fmt.Println("")
		})
		reader := bufio.NewReader(os.Stdin)
		text, _ := reader.ReadString('\n')
		NoPipe(func() {
			fmt.Println("Result:")
			fmt.Println("")
		})
		fmt.Println(priv.DecryptToString(text))
	case "":
		fmt.Println("Usage: keypair [command]")
		fmt.Println("")
		fmt.Println("Commands:")
		fmt.Println("  generate <dir> - Generate a new keypair and save it to <dir>")
		fmt.Println("  encrypt - Encrypt a string using the public key")
		fmt.Println("  decrypt - Decrypt a string using the private key")
		fmt.Println("")
		fmt.Println("Flags:")
		fmt.Println("  --pipe - Pipe the result to stdout")
		fmt.Println("")
		fmt.Println("Environment Variables:")
		fmt.Println("  KEYPAIR_DIR - The directory where the keypair is stored, defaults to the current working directory")
	}
}

func NoPipe(cb func()) {
	var isPipe bool = false
	if os.Args[len(os.Args)-1] == "--pipe" {
		isPipe = true
	}
	if isPipe {
		return
	} else {
		cb()
	}
}

func EnvWarn() {
	if KEY_DIR == "" {
		NoPipe(func() {
			fmt.Println("Warning: KEYPAIR_DIR environment variable not set")
			fmt.Println("Using current working directory")
		})
		KEY_DIR, _ = os.Getwd()
	}
}