package base62json

import (
	"errors"

	"git.fsdpf.net/go/base62"
	"git.fsdpf.net/go/jsonpack"

	"github.com/samber/lo"
)

const cursor = 59

var bs62 *base62.Base62

func init() {
	bs62 = base62.GetInstance()
}

// 项目入口
func GenerateProjectSecret(key, secret string) ([]byte, error) {
	appSecret := lo.FindUniques([]byte(secret))

	if len(appSecret) != 62 {
		return nil, errors.New("Invalid secret")
	}

	for i := 0; i < len(key); i++ {
		appSecret[key[i]%cursor], appSecret[cursor-(key[i]%cursor)] = appSecret[cursor-(key[i]%cursor)], appSecret[key[i]%cursor]
	}

	return appSecret, nil
}

func SetCharacters(secret []byte) error {
	if res, err := bs62.SetCharacters(secret); err == nil {
		bs62 = res
	} else {
		return err
	}
	return nil
}

func Encode[T []any | map[string]any](data T) (string, error) {
	str, err := jsonpack.Pack(data)

	if err != nil {
		return "", err
	}

	res := bs62.Encode([]byte(str))

	return res, nil
}

func Decode(str string) (string, error) {
	json, err := bs62.Decode(str)

	if err != nil {
		return "", err
	}

	data := string(json)

	return jsonpack.Unpack(data)
}