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package br.com.caelum.stella.hibernate.validator;

import br.com.caelum.stella.MessageProducer;
import br.com.caelum.stella.SimpleValidationMessage;
import br.com.caelum.stella.ValidationMessage;
import br.com.caelum.stella.validation.InvalidValue;

import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * Recupera mensagens de validação definida na anotação do Hibernate Validator.
 *
 * @author Fabio Kung
 */
@SuppressWarnings("unchecked")
public class AnnotationMessageProducer implements MessageProducer{

    private final Annotation constraint;

    public AnnotationMessageProducer(Annotation constraint) {
        this.constraint = constraint;
    }

    /**
     * This method will always return the same ValidationMessage, as Hibernate Validator only
     * let one message per Validator, defined inside the constraint annotation.
     *
     * @param invalidValue will be ignored
     * @return the message defined by the related constraint annotation
     */
    public ValidationMessage getMessage(InvalidValue invalidValue) {
        try {
            Method constraintMessage = constraint.annotationType().getMethod("message");
            String message = constraintMessage.invoke(constraint).toString();
            return new SimpleValidationMessage(message);
        } catch (NoSuchMethodException e) {
            // same behavior as Hibernate Validator built-in validators
            // see org.hibernate.validator.interpolator.DefaultMessageInterpolator
            throw new IllegalArgumentException("Annotation " + constraint + " does not have an (accessible) message attribute");
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        } catch (InvocationTargetException e) {
            throw new RuntimeException(e);
        }
    }
}