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/**
 * vertigo - simple java starter
 *
 * Copyright (C) 2013-2016, 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.facet.model;

import java.io.Serializable;
import java.util.Comparator;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.TreeMap;
import java.util.stream.Collectors;

import io.vertigo.dynamo.collections.CollectionsManager;
import io.vertigo.dynamo.collections.ListFilter;
import io.vertigo.dynamo.collections.metamodel.FacetDefinition;
import io.vertigo.dynamo.collections.metamodel.FacetedQueryDefinition;
import io.vertigo.dynamo.collections.model.Facet;
import io.vertigo.dynamo.collections.model.FacetValue;
import io.vertigo.dynamo.domain.metamodel.DtField;
import io.vertigo.dynamo.domain.model.DtList;
import io.vertigo.dynamo.domain.model.DtObject;
import io.vertigo.lang.Assertion;
import io.vertigo.lang.MessageText;
import io.vertigo.util.StringUtil;

/**
 * Factory de FacetedQueryDefinition.
 * Permet de créer les définitions avant de les enregistrer dans via la registry dans le namespace.
 * @author pchretien, npiedeloup
 */
public final class FacetFactory {
	private final CollectionsManager collectionManager;

	/**
	 * Constructor.
	 * @param collectionManager Collections Manager
	 */
	public FacetFactory(final CollectionsManager collectionManager) {
		Assertion.checkNotNull(collectionManager);
		//-----
		this.collectionManager = collectionManager;
	}

	/**
	 * Création d'une liste de facettes à partir d'une liste.
	 * @param facetedQueryDefinition Requête
	 * @param dtList Liste
	 * @return Liste des facettes.
	 */
	public List createFacets(final FacetedQueryDefinition facetedQueryDefinition, final DtList dtList) {
		Assertion.checkNotNull(facetedQueryDefinition);
		Assertion.checkNotNull(dtList);
		//-----
		return facetedQueryDefinition.getFacetDefinitions()
				.stream()
				.map(facetDefinition -> createFacet(facetDefinition, dtList))
				.collect(Collectors.toList());
	}

	/**
	 * Création d'un cluster d'une liste à partir d'une facette.
	 * @param  Type de l'entité
	 * @param facetDefinition Facette utilisée pour le cluster
	 * @param dtList Liste
	 * @return Map du cluster
	 */
	public  Map> createCluster(final FacetDefinition facetDefinition, final DtList dtList) {
		Assertion.checkNotNull(facetDefinition);
		Assertion.checkNotNull(dtList);
		//-----
		if (facetDefinition.isRangeFacet()) {
			//Cas des facettes par 'range'
			return createRangeCluster(facetDefinition, dtList);
		}
		//Cas des facettes par 'term'
		return createTermCluster(facetDefinition, dtList);
	}

	private  DtList apply(final ListFilter listFilter, final DtList fullDtList) {
		//on délégue à CollectionsManager les méthodes de requête de filtrage.
		return collectionManager. createDtListProcessor()
				.filter(listFilter)
				.apply(fullDtList);
	}

	private Facet createFacet(final FacetDefinition facetDefinition, final DtList dtList) {
		if (facetDefinition.isRangeFacet()) {
			//Cas des facettes par 'range'
			return createRangeFacet(facetDefinition, dtList);
		}
		//Cas des facettes par 'term'
		return createTermFacet(facetDefinition, dtList);
	}

	private  Facet createRangeFacet(final FacetDefinition facetDefinition, final DtList dtList) {
		final Map> clusterValues = createRangeCluster(facetDefinition, dtList);
		//map résultat avec le count par FacetFilter
		final Map facetValues = new LinkedHashMap<>();
		for (final Entry> entry : clusterValues.entrySet()) {
			facetValues.put(entry.getKey(), Long.valueOf(entry.getValue().size()));
		}
		return new Facet(facetDefinition, facetValues);
	}

	private  Map> createRangeCluster(final FacetDefinition facetDefinition, final DtList dtList) {
		//map résultat avec les docs par FacetFilter
		final Map> clusterValues = new LinkedHashMap<>();

		for (final FacetValue facetRange : facetDefinition.getFacetRanges()) {
			//Pour chaque Valeur de facette on trouve les élements.
			final DtList facetFilteredList = apply(facetRange.getListFilter(), dtList);
			clusterValues.put(facetRange, facetFilteredList);
		}
		return clusterValues;
	}

	private static  Facet createTermFacet(final FacetDefinition facetDefinition, final DtList dtList) {
		final Map> clusterValues = createTermCluster(facetDefinition, dtList);
		//map résultat avec le count par FacetFilter
		final Map facetValues = new LinkedHashMap<>();
		for (final Entry> entry : clusterValues.entrySet()) {
			facetValues.put(entry.getKey(), Long.valueOf(entry.getValue().size()));
		}
		return new Facet(facetDefinition, facetValues);
	}

	private static  Map> createTermCluster(final FacetDefinition facetDefinition, final DtList dtList) {
		//map résultat avec les docs par FacetFilter
		final Map> clusterValues = new LinkedHashMap<>();

		//Cas des facettes par Term
		final DtField dtField = facetDefinition.getDtField();
		//on garde un index pour incrémenter le facetFilter pour chaque Term
		final Map facetFilterIndex = new HashMap<>();

		FacetValue facetValue;
		for (final D dto : dtList) {
			final Object value = dtField.getDataAccessor().getValue(dto);
			facetValue = facetFilterIndex.get(value);
			if (facetValue == null) {
				final String valueAsString = dtField.getDomain().getFormatter().valueToString(value, dtField.getDomain().getDataType());
				final String stringLabel;
				if (StringUtil.isEmpty(valueAsString)) {
					stringLabel = "<==no label==>";
				} else {
					stringLabel = valueAsString;
				}
				final MessageText label = new MessageText(stringLabel, null);
				//on garde la syntaxe Solr pour l'instant
				final ListFilter listFilter = new ListFilter(dtField.getName() + ":\"" + valueAsString + "\"");
				facetValue = new FacetValue(stringLabel, listFilter, label);
				facetFilterIndex.put(value, facetValue);
				clusterValues.put(facetValue, new DtList(dtList.getDefinition()));
			}
			clusterValues.get(facetValue).add(dto);
		}

		//tri des facettes
		final Comparator facetComparator = new FacetComparator<>(clusterValues);
		final Map> sortedFacetValues = new TreeMap<>(facetComparator);
		sortedFacetValues.putAll(clusterValues);
		return sortedFacetValues;
	}

	private static final class FacetComparator implements Comparator, Serializable {
		private static final long serialVersionUID = 6149508435834977887L;
		private final Map> clusterValues;

		FacetComparator(final Map> clusterValues) {
			this.clusterValues = clusterValues;
		}

		@Override
		public int compare(final FacetValue o1, final FacetValue o2) {
			final int compareNbDoc = clusterValues.get(o2).size() - clusterValues.get(o1).size();
			return compareNbDoc != 0 ? compareNbDoc : o1.getLabel().getDisplay().compareToIgnoreCase(o2.getLabel().getDisplay());
		}
	}

}