package middleware

import (
	"net/http"
	"strings"

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

func JWT(secret []byte) gin.HandlerFunc {
	return func(c *gin.Context) {
		h := c.GetHeader("Authorization")
		if !strings.HasPrefix(h, "Bearer ") {
			c.AbortWithStatusJSON(http.StatusUnauthorized,
				gin.H{"error": "missing bearer token"})
			return
		}
		raw := strings.TrimPrefix(h, "Bearer ")
		token, err := jwt.Parse(raw, func(t *jwt.Token) (any, error) {
			if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
				return nil, jwt.ErrSignatureInvalid
			}
			return secret, nil
		})
		if err != nil || !token.Valid {
			c.AbortWithStatusJSON(http.StatusUnauthorized,
				gin.H{"error": "invalid token"})
			return
		}
		claims := token.Claims.(jwt.MapClaims)
		c.Set("profile_id", claims["sub"].(string))
		c.Next()
	}
}