package application

import (
	"time"

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

type Claims struct {
	UserID   uint   `json:"user_id"`
	TenantID string `json:"tenant_id"`
	Type     string `json:"type"`
	jwt.RegisteredClaims
}

func GenerateToken(userID uint, tenantID, tokenType string, expiry time.Duration, secret, issuer string) (string, error) {
	claims := Claims{
		UserID:   userID,
		TenantID: tenantID,
		Type:     tokenType,
		RegisteredClaims: jwt.RegisteredClaims{
			ExpiresAt: jwt.NewNumericDate(time.Now().Add(expiry)),
			IssuedAt:  jwt.NewNumericDate(time.Now()),
			Issuer:    issuer,
		},
	}

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

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

	claims, ok := token.Claims.(*Claims)
	if !ok || !token.Valid {
		return nil, jwt.ErrTokenInvalidClaims
	}

	return claims, nil
}