package middleware

import (
	"fmt"
	"github.com/gin-gonic/gin"
	"github.com/golang-jwt/jwt/v5"
	"net/http"
	"os"
	"time"
	"udemy_httpserver/models"
)

func RequireAuth(c *gin.Context) {
	// Get JWT from cookie
	tokenString := c.GetHeader("Authorization")
	if tokenString == "" {
		c.JSON(http.StatusUnauthorized, gin.H{"error": "Unauthorized"})
		c.Abort()
		return
	}
	tokenString = tokenString[7:] // Remove "Bearer " from the token
	// Decode/validate it
	token, _ := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
		// Don't forget to validate the alg is what you expect:
		if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
			return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
		}

		// hmacSampleSecret is a []byte containing your secret, e.g. []byte("my_secret_key")
		return []byte(os.Getenv("JWT_SECRET")), nil
	})

	if claims, ok := token.Claims.(jwt.MapClaims); ok && token.Valid {
		// Check the expiry date
		if float64(time.Now().Unix()) > claims["exp"].(float64) {
			c.AbortWithStatus(http.StatusUnauthorized)
		}
		// Validate that the user exists in the database
		user, err := models.FindOneByID(int(claims["sub"].(float64)))
		if err != nil || user == nil {
			c.AbortWithStatus(http.StatusUnauthorized)
		}
		c.Set("user", user)
		c.Next()
	} else {
		c.AbortWithStatus(http.StatusUnauthorized)
	}

}