package auth

import (
	"time"

	"github.com/golang-jwt/jwt/v5"
	"github.com/google/uuid"
)

type Claims struct {
	UserID uuid.UUID `json:"user_id"`
	Role   string    `json:"role"`
	jwt.RegisteredClaims
}

func GenerateAccessToken(userID uuid.UUID, role string, secret string, ttlMinutes int) (string, time.Time, error) {
	expirationTime := time.Now().Add(time.Duration(ttlMinutes) * time.Minute)
	claims := &Claims{
		UserID: userID,
		Role:   role,
		RegisteredClaims: jwt.RegisteredClaims{
			ExpiresAt: jwt.NewNumericDate(expirationTime),
			IssuedAt:  jwt.NewNumericDate(time.Now()),
		},
	}

	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
	tokenString, err := token.SignedString([]byte(secret))
	return tokenString, expirationTime, err
}

func ValidateToken(tokenString string, secret string) (*Claims, error) {
	claims := &Claims{}
	token, err := jwt.ParseWithClaims(tokenString, claims, func(token *jwt.Token) (interface{}, error) {
		return []byte(secret), nil
	})

	if err != nil {
		return nil, err
	}

	if !token.Valid {
		return nil, jwt.ErrSignatureInvalid
	}

	return claims, nil
}