/*
 * #%L
 * BroadleafCommerce Common Libraries
 * %%
 * Copyright (C) 2009 - 2016 Broadleaf Commerce
 * %%
 * 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.
 * #L%
 */
/**
 * 
 */
package org.broadleafcommerce.common.i18n.service;

import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.collections4.Transformer;
import org.apache.commons.lang.StringUtils;
import org.broadleafcommerce.common.i18n.domain.TranslatedEntity;
import org.broadleafcommerce.common.i18n.domain.Translation;

import java.util.Collection;
import java.util.List;

import net.sf.ehcache.Cache;
import net.sf.ehcache.CacheManager;
import net.sf.ehcache.Element;

/**
 * Thread-local cache structure that contains all of the {@link Translation}s for a batch of processing. This is mainly
 * used when executing a search re-index operation. Rather than go to the database for each item being indexed, it makes
 * more sense to go to the database once, cache all of the results here, and then let the {@link TranslationService}
 * use this instead.
 * 
 * @author Phillip Verheyden (phillipuniverse)
 */
public class TranslationBatchReadCache {
    
    public static final String CACHE_NAME = "blBatchTranslationCache";

    public static Cache getCache() {
        return CacheManager.getInstance().getCache(CACHE_NAME);
    }
    
    public static void clearCache() {
        getCache().removeAll();
    }
    
    public static void addToCache(List<Translation> translations) {
        Collection<Element> translationCacheElements = CollectionUtils.collect(translations, new Transformer<Translation, Element>() {

            @Override
            public Element transform(Translation input) {
                return new Element(buildCacheKey(input), input);
            }
            
        });
        getCache().putAll(translationCacheElements);
    }
    
    public static Translation getFromCache(TranslatedEntity entityType, String id, String propertyName, String localeCode) {
        Element cacheEntry = getCache().get(buildCacheKey(entityType, id, propertyName, localeCode));
        if (cacheEntry == null && StringUtils.contains(localeCode, '_')) {
            String languageWithoutCountryCode = localeCode.substring(localeCode.indexOf('_') + 1);
            cacheEntry = getCache().get(buildCacheKey(entityType, id, propertyName, languageWithoutCountryCode));
        }
        
        return (cacheEntry == null) ? null : (Translation) cacheEntry.getObjectValue();
    }
    
    public static String buildCacheKey(Translation translation) {
        return buildCacheKey(translation.getEntityType(),
            translation.getEntityId(),
            translation.getFieldName(),
            translation.getLocaleCode());
    }
    
    public static String buildCacheKey(TranslatedEntity entityType, String id, String propertyName, String localeCode) {
        return StringUtils.join(new String[]{entityType.getType(), id, propertyName, localeCode}, "-");
    }
}