/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *    https://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 */
package org.grails.web.converters.marshaller.xml;

import java.util.Locale;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.i18n.LocaleContextHolder;
import org.springframework.validation.Errors;
import org.springframework.validation.FieldError;

import grails.converters.XML;
import org.grails.web.converters.exceptions.ConverterException;
import org.grails.web.converters.marshaller.NameAwareMarshaller;
import org.grails.web.converters.marshaller.ObjectMarshaller;

/**
 * @author Siegfried Puchbauer
 * @since 1.1
 */
public class ValidationErrorsMarshaller implements ObjectMarshaller<XML>, NameAwareMarshaller, ApplicationContextAware {

    private ApplicationContext applicationContext;

    public boolean supports(Object object) {
        return object instanceof Errors;
    }

    public void marshalObject(Object object, XML xml) throws ConverterException {
        Errors errors = (Errors) object;

        try {
            for (Object o : errors.getAllErrors()) {
                if (o instanceof FieldError) {
                    FieldError fe = (FieldError) o;
                    xml.startNode("error");
                    xml.attribute("object", fe.getObjectName());
                    xml.attribute("field", fe.getField());
                    xml.startNode("rejected-value").convertAnother(fe.getRejectedValue());
                    xml.end();
                    Locale locale = LocaleContextHolder.getLocale();
                    if (applicationContext != null) {
                        xml.startNode("message").chars(applicationContext.getMessage(fe, locale)).end();
                    }
                    else {
                        String defaultMessage = fe.getDefaultMessage();
                        if (defaultMessage != null)
                            xml.startNode("message").chars(defaultMessage).end();
                    }
                    xml.end();
                }
            }
        }
        catch (ConverterException ce) {
            throw ce;
        }
        catch (Exception e) {
            throw new ConverterException("Error converting Bean with class " + object.getClass().getName(), e);
        }
    }

    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }

    public String getElementName(Object o) {
        return "errors";
    }
}
