package auth

import (
	"os"
	"time"

	"github.com/golang-jwt/jwt/v4"
)

var jwtSecret = []byte(os.Getenv("JWT_SECRET"))

type Claims struct {
	Username string `json:"username"`
	Role     string `json:"role"`
	jwt.RegisteredClaims
}

func GenerateJWT(username string, role string) (string, error) {
	claims := Claims{
		Username: username,
		Role:     role,
		RegisteredClaims: jwt.RegisteredClaims{
			ExpiresAt: jwt.NewNumericDate(time.Now().Add(24 * time.Hour)), // 24h expiration
			IssuedAt:  jwt.NewNumericDate(time.Now()),
			NotBefore: jwt.NewNumericDate(time.Now()),
		},
	}

	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
	return token.SignedString(jwtSecret)
}