package handler

import (
	"net/http"
	"strings"
)

// TokenAuth — middleware для проверки Bearer-токена.
// Сравнивает токен из заголовка Authorization с AUTH_TOKEN из конфига.
func TokenAuth(token string) func(http.Handler) http.Handler {
	return func(next http.Handler) http.Handler {
		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			header := r.Header.Get("Authorization")
			if header == "" {
				http.Error(w, `{"error":"missing authorization header"}`, http.StatusUnauthorized)
				return
			}

			bearerToken := strings.TrimPrefix(header, "Bearer ")
			if bearerToken == header || bearerToken != token {
				http.Error(w, `{"error":"invalid or missing token"}`, http.StatusUnauthorized)
				return
			}

			next.ServeHTTP(w, r)
		})
	}
}