package token

import (
	"fmt"
	"github.com/golang-jwt/jwt/v5"
	log "github.com/sirupsen/logrus"
	"net/http"
	"strconv"
	"strings"
	"time"
)

type JWT struct {
	SecretKey     string
	Issuer        string
	AccessExpire  time.Duration
	RefreshExpire time.Duration
}

type Deps struct {
	SecretKey     string
	Issuer        string
	AccessExpire  string
	RefreshExpire string
}

func NewJWT(deps Deps) *JWT {
	return &JWT{
		SecretKey:     deps.SecretKey,
		Issuer:        deps.Issuer,
		AccessExpire:  duration(deps.AccessExpire),
		RefreshExpire: duration(deps.RefreshExpire),
	}
}

func (j *JWT) CreateAccessToken(userUuid, sessionUuid string) (string, error) {
	now := time.Now()

	token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{
		"exp": now.Add(j.AccessExpire).Unix(),
		"iat": now.Unix(),
		"iss": j.Issuer,
		"nbf": now.Unix(),
		"sub": userUuid,
		"sid": sessionUuid,
	})

	signedToken, err := token.SignedString([]byte(j.SecretKey))
	if err != nil {
		return "", err
	}

	return signedToken, nil
}

func (j *JWT) CreateRefreshToken(refreshUuid string, expires time.Time) *http.Cookie {
	return &http.Cookie{
		Name:        "refresh_uuid",
		Value:       refreshUuid,
		Expires:     expires,
		Secure:      false,
		HttpOnly:    true,
		SameSite:    3,
		Partitioned: false,
	}
}

func (j *JWT) Parse(token string) (string, error) {
	if strings.HasPrefix(token, "Bearer ") {
		token = strings.TrimPrefix(token, "Bearer ")
	}

	parse, err := jwt.Parse(token, func(token *jwt.Token) (interface{}, error) {
		if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
			return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
		}
		return []byte(j.SecretKey), nil
	})
	if err != nil {
		log.Error(err)
		return "", err
	}

	if claims, ok := parse.Claims.(jwt.MapClaims); ok && parse.Valid {
		userUuid := claims["sub"].(string)

		return userUuid, nil
	}

	return "", fmt.Errorf("invalid token")
}

func (j *JWT) RefreshExpires() time.Duration {
	return j.RefreshExpire
}

func duration(minutes string) time.Duration {
	dur, err := strconv.Atoi(minutes)
	if err != nil {
		return time.Duration(10) * time.Minute
	}

	return time.Duration(dur) * time.Minute
}