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/**
 * vertigo - simple java starter
 *
 * Copyright (C) 2013, KleeGroup, [email protected] (http://www.kleegroup.com)
 * KleeGroup, Centre d'affaire la Boursidiere - BP 159 - 92357 Le Plessis Robinson Cedex - France
 *
 * 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 io.vertigo.dynamo.impl.collections;

import io.vertigo.dynamo.collections.CollectionsManager;
import io.vertigo.dynamo.collections.DtListProcessor;
import io.vertigo.dynamo.collections.IndexDtListFunctionBuilder;
import io.vertigo.dynamo.collections.ListFilter;
import io.vertigo.dynamo.collections.model.Facet;
import io.vertigo.dynamo.collections.model.FacetValue;
import io.vertigo.dynamo.collections.model.FacetedQuery;
import io.vertigo.dynamo.collections.model.FacetedQueryResult;
import io.vertigo.dynamo.domain.metamodel.DtField;
import io.vertigo.dynamo.domain.model.DtList;
import io.vertigo.dynamo.domain.model.DtObject;
import io.vertigo.dynamo.impl.collections.facet.model.FacetFactory;
import io.vertigo.lang.Assertion;
import io.vertigo.lang.Option;

import java.util.Collections;
import java.util.List;
import java.util.Map;

import javax.inject.Inject;

/**
 * Implémentation du gestionnaire de la manipulation des collections.
 *
 * @author  pchretien
 */
public final class CollectionsManagerImpl implements CollectionsManager {
	private final Option indexPlugin;

	private final FacetFactory facetFactory;
	private final DtListProcessor listProcessor;

	/**
	 * Constructeur.
	 * @param indexPlugin Plugin optionnel d'index
	 */
	@Inject
	public CollectionsManagerImpl(final Option indexPlugin) {
		Assertion.checkNotNull(indexPlugin);
		//-----
		this.indexPlugin = indexPlugin;
		facetFactory = new FacetFactory(this);
		listProcessor = new DtListProcessorImpl();
	}

	/** {@inheritDoc} */
	@Override
	public  FacetedQueryResult> facetList(final DtList dtList, final FacetedQuery facetedQuery) {
		Assertion.checkNotNull(dtList);
		Assertion.checkNotNull(facetedQuery);
		//-----
		//1- on applique les filtres
		final DtList filteredDtList = filter(dtList, facetedQuery);
		//2- on facette
		final List facets = facetFactory.createFacets(facetedQuery.getDefinition(), filteredDtList);

		//TODO 2b- cluster vide
		final Map> resultCluster = Collections.emptyMap();

		//TODO 2c- mise en valeur vide
		final Map> highlights = Collections.emptyMap();

		//3- on construit le résultat
		return new FacetedQueryResult<>(Option.some(facetedQuery), filteredDtList.size(), filteredDtList, facets, resultCluster, highlights, dtList);
	}

	//=========================================================================
	//=======================Filtrage==========================================
	//=========================================================================
	private  DtList filter(final DtList dtList, final FacetedQuery facetedQuery) {
		final List listFilters = facetedQuery.getListFilters();
		DtListProcessor dtListProcessor = createDtListProcessor();
		for (final ListFilter listFilter : listFilters) {
			dtListProcessor = dtListProcessor.filter(listFilter);
		}
		return dtListProcessor.apply(dtList);
	}

	/** {@inheritDoc} */
	@Override
	public DtListProcessor createDtListProcessor() {
		return listProcessor;
	}

	/** {@inheritDoc} */
	@Override
	public  IndexDtListFunctionBuilder createIndexDtListFunctionBuilder() {
		Assertion.checkNotNull(indexPlugin.isDefined(), "An IndexPlugin is required to use this function");
		//-----
		return new IndexDtListFunctionBuilderImpl<>(indexPlugin.get());
	}
}