namespace MessengerBroker.Handlers
{
    public class AuthHandler
    {
        private readonly Settings settings;

        public AuthHandler(Settings settings)
        {
            this.settings = settings;
        }

        public Guid? Auth(HttpContext context)
        {
            var authHeader = context.Request.Headers["Authorization"].ToString();

            if (!string.IsNullOrEmpty(authHeader) && authHeader.StartsWith("Bearer "))
            {
                var token = authHeader.Substring("Bearer ".Length).Trim();
                if (Guid.TryParse(token, out Guid brokerId) && this.settings.Slaves.Any(x => x.BrokerId == brokerId))
                {
                    return brokerId;
                }
            }

            return null;
        }
    }
}