package logic

import (
	"crypto/sha256"
	"encoding/hex"
	"encoding/json"
	"github.com/go-oauth2/oauth2/v4/server"
	"net/http"
	"os"
)

type Config struct {
	ContractCheckSum string `json:"ContractCheckSum"`
	AuthServerPort   int    `json:"AuthServerPort"`
	WalletFile       string `json:"WalletFile"`
	EndpointUrl      string `json:"EndpointUrl"`
	AccountSecret    string `json:"AccountSecret"`
}

func LoadConfig(pathToJsonConfig string) (Config, error) {
	var config Config

	file, err := os.Open(pathToJsonConfig)
	if err != nil {
		return config, err
	}
	defer file.Close()

	decoder := json.NewDecoder(file)
	err = decoder.Decode(&config)
	if err != nil {
		return config, err
	}

	return config, nil
}

func ValidateToken(f http.HandlerFunc, srv *server.Server) http.HandlerFunc {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		_, err := srv.ValidationBearerToken(r)
		if err != nil {
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}

		f.ServeHTTP(w, r)
	})
}

func HashSecret(secret string) string {
	encoder := sha256.New()
	encoder.Write([]byte(secret))
	hashBytes := encoder.Sum(nil)

	return hex.EncodeToString(hashBytes)
}

func AddDefaultClientCredentialsIfNotExists(id string) error {
	if _, ok := clients[id]; ok {
		return nil
	}
	return AddInMemoryClient(id, "", "", false)
}