package app

import (
	"fmt"
	"os"
	"strings"

	"github.com/farahty/go-mongo/models"
	"github.com/golang-jwt/jwt/v4"
	"github.com/mitchellh/mapstructure"
)

func getTokenFromHeader(authHeader string) (string, error) {

	if authHeader == "" {
		return "", fmt.Errorf("there is no authorization header provided")
	}

	authSlice := strings.Split(authHeader, " ")

	if len(authSlice) != 2 {
		return "", fmt.Errorf("wrong access token or header format")
	}

	return strings.TrimSpace(authSlice[1]), nil
}

func getUserFromToken(tokenString string) (*models.UserJWT, error) {
	token, err := jwt.Parse(tokenString, func(t *jwt.Token) (interface{}, error) {

		if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
			return nil, fmt.Errorf("wrong token format ")
		}
		return []byte(os.Getenv("ACCESS_SECRET")), nil
	})

	if err != nil {
		return nil, err
	}

	if !token.Valid {
		return nil, fmt.Errorf("token is not valid")
	}

	var user *models.UserJWT
	claims := token.Claims.(jwt.MapClaims)
	if err := mapstructure.Decode(claims["data"], &user); err != nil {

		return nil, fmt.Errorf("error while decoding payload claim")
	}

	return user, nil
}