package controllers

import (
	"errors"
	"time"

	"github.com/beego/beego/v2/core/logs"
	"github.com/dgrijalva/jwt-go"
)

const mySuperSecretKey = "jdnfksdmfksd"

func CreateToken(userId string) (string, error) {
	var err error
	//Creating Access Token
	// os.Setenv("ACCESS_SECRET", "jdnfksdmfksd") //this should be in an env file
	atClaims := jwt.MapClaims{}
	atClaims["authorized"] = true
	atClaims["user_id"] = userId
	atClaims["exp"] = time.Now().UTC().Add(time.Hour * 15).Unix()
	at := jwt.NewWithClaims(jwt.SigningMethodHS256, atClaims)
	token, err := at.SignedString([]byte(mySuperSecretKey))
	if err != nil {
		return "", err
	}
	return token, nil
}

func IsValidToken(jwtToken string) (*jwt.Token, error) {
	token, err := jwt.Parse(jwtToken, func(token *jwt.Token) (interface{}, error) {
		//TODO: Validate expected algorithm
		return []byte(mySuperSecretKey), nil
	})

	var message string

	if err == nil && token.Valid {
		return token, nil
	} else if ve, ok := err.(*jwt.ValidationError); ok {
		if ve.Errors&jwt.ValidationErrorMalformed != 0 {
			message = "Token " + jwtToken + " is not even a token"
		} else if ve.Errors&(jwt.ValidationErrorExpired|jwt.ValidationErrorNotValidYet) != 0 {
			message = "Token is either expired or not active yet"
		} else {
			message = "Couldn't handle this token: " + err.Error()
		}
	}

	logs.Debug(message)
	return nil, errors.New(message)
}

func GetUsernameFromToken(token string) (string, error) {

	tokenObj, err := IsValidToken(token)
	if err != nil {
		logs.Debug(err)
		return "", err
	}

	if claims, ok := tokenObj.Claims.(jwt.MapClaims); ok {
		return claims["user_id"].(string), nil
	}

	logs.Debug("Unknow JWT error")
	return "", errors.New("Unknow JWT error")

}