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/*
 * Copyright 2012 Lincoln Baxter, III
 * 
 * Licensed 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.ocpsoft.prettytime.jsf;


import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.convert.ConverterException;

import org.ocpsoft.prettytime.PrettyTime;

import java.io.Serializable;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.Locale;
import java.util.Map;

public class PrettyTimeConverter implements Converter, Serializable
{
    private static final long serialVersionUID = 7690470362440868260L;

    private static final int MAX_CACHE_SIZE = 20;

    // Cache PrettyTime per locale. LRU cache to prevent memory leak.
    private static final Map PRETTY_TIME_LOCALE_MAP = new LinkedHashMap(MAX_CACHE_SIZE + 1, 1.1F, true)
    {
      private static final long serialVersionUID = 5093634937930600141L;

      @Override
        protected boolean removeEldestEntry(Map.Entry eldest)
        {
            return size() > MAX_CACHE_SIZE;
        }
    };


    public Object getAsObject(final FacesContext context, final UIComponent comp, final String value)
    {
        throw new ConverterException("Does not yet support converting String to Date");
    }

    public String getAsString(final FacesContext context, final UIComponent comp, final Object value)
    {
        if (value instanceof Date)
        {
            PrettyTime prettyTime;

            // Use locale of current viewer.
            Locale locale = context.getViewRoot().getLocale();

            synchronized (PRETTY_TIME_LOCALE_MAP)
            {
                prettyTime = PRETTY_TIME_LOCALE_MAP.get(locale);
                if (prettyTime == null)
                {
                    prettyTime = new PrettyTime(locale);
                    PRETTY_TIME_LOCALE_MAP.put(locale, prettyTime);
                }
            }
            return prettyTime.format((Date) value);
        }
        throw new ConverterException("May only be used to convert java.util.Date objects. Got: " + (value != null ? value.getClass() : "null"));
    }
}