package +zoccolo+.web.resolver;

import +zoccolo+.security.Belonger;
import +zoccolo+.web.annotation.LoggedUser;

import java.security.Principal;

import org.springframework.core.MethodParameter;
import org.springframework.security.core.Authentication;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.support.WebArgumentResolver;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.ModelAndViewContainer;

@Component
public class LoggedUserMethodArgumentResolver
	implements HandlerMethodArgumentResolver {
	
	@Override
    public boolean supportsParameter(MethodParameter methodParameter) {
         return
             methodParameter.getParameterAnnotation(LoggedUser.class) != null
             	&& methodParameter.getParameterType().equals(Belonger.class);
    }
	
	@Override
    public Object resolveArgument(MethodParameter methodParameter,
                        ModelAndViewContainer mavContainer,
                        NativeWebRequest webRequest,
                        WebDataBinderFactory binderFactory) throws Exception {

         if (this.supportsParameter(methodParameter)) {
             Principal principal = webRequest.getUserPrincipal();
             return principal==null?null:(Belonger) ((Authentication) principal).getPrincipal();
         }
         else {
             return WebArgumentResolver.UNRESOLVED;
         }
    }

	/* screwdriver_knife */

}