package utils

import (
	"errors"
	"time"

	"lokideploy/config"

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

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

func GenerateToken(userID uint, username, role string) (string, error) {
	cfg := config.GetConfig()
	claims := Claims{
		UserID:   userID,
		Username: username,
		Role:     role,
		RegisteredClaims: jwt.RegisteredClaims{
			ExpiresAt: jwt.NewNumericDate(time.Now().Add(24 * time.Hour)),
			IssuedAt:  jwt.NewNumericDate(time.Now()),
			Subject:   username,
		},
	}
	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
	return token.SignedString([]byte(cfg.JWTSecret))
}

func ParseToken(tokenString string) (*Claims, error) {
	cfg := config.GetConfig()
	token, err := jwt.ParseWithClaims(tokenString, &Claims{}, func(token *jwt.Token) (interface{}, error) {
		return []byte(cfg.JWTSecret), nil
	})
	if err != nil {
		return nil, err
	}
	if claims, ok := token.Claims.(*Claims); ok && token.Valid {
		return claims, nil
	}
	return nil, errors.New("invalid token")
}

func GetUserFromContext(c *gin.Context) (*Claims, bool) {
	user, exists := c.Get("user")
	if !exists {
		return nil, false
	}
	claims, ok := user.(*Claims)
	return claims, ok
}

func IsAdmin(c *gin.Context) bool {
	claims, ok := GetUserFromContext(c)
	return ok && claims.Role == "admin"
}