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/*
 * 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
 *
 * http://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.apache.deltaspike.jsf.impl.message;

import org.apache.deltaspike.core.impl.message.DefaultLocaleResolver;

import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.inject.Specializes;
import javax.faces.component.UIViewRoot;
import javax.faces.context.FacesContext;
import java.util.Iterator;
import java.util.Locale;

@ApplicationScoped
@Specializes
public class JsfAwareLocaleResolver extends DefaultLocaleResolver
{
    private static final long serialVersionUID = -8776583393262804931L;

    @Override
    public Locale getLocale()
    {
        FacesContext facesContext = FacesContext.getCurrentInstance();
        if (facesContext != null && facesContext.getCurrentPhaseId() != null)
        {
            UIViewRoot viewRoot = facesContext.getViewRoot();
            Locale result = null;
            if (viewRoot != null)
            {
                // if a ViewRoot is present we return the Locale from there
                result = viewRoot.getLocale();
            }

            if (result != null)
            {
                Iterator supportedLocale = facesContext.getApplication().getSupportedLocales();

                boolean supportedLocaleConfigured = false;
                while (supportedLocale.hasNext())
                {
                    supportedLocaleConfigured = true;
                    if (result.equals(supportedLocale.next()))
                    {
                        return result;
                    }
                }

                if (!supportedLocaleConfigured)
                {
                    return result;
                }
            }

            result = facesContext.getApplication().getDefaultLocale();

            if (result != null)
            {
                return result;
            }
        }

        // return the default Locale, if no Locale was found
        return super.getLocale();
    }
}