EDIT

/**

* Copyright (C) 2007 EDIT

* European Distributed Institute of Taxonomy

* http://www.e-taxonomy.eu

*

* The contents of this file are subject to the Mozilla Public License Version 1.1

* See LICENSE.TXT at the top of this package for the full license terms.

*/

package eu.etaxonomy.cdm.ext.geo;

import java.awt.Color;

import java.io.IOException;

import java.io.UnsupportedEncodingException;

import java.net.URLEncoder;

import java.util.ArrayList;

import java.util.Collection;

import java.util.Collections;

import java.util.HashMap;

import java.util.HashSet;

import java.util.List;

import java.util.Map;

import java.util.Set;

import java.util.UUID;

import javax.persistence.Transient;

import org.apache.commons.collections.CollectionUtils;

import org.apache.commons.lang.StringUtils;

import org.apache.log4j.Logger;

import com.fasterxml.jackson.core.JsonParseException;

import com.fasterxml.jackson.databind.JsonMappingException;

import com.fasterxml.jackson.databind.ObjectMapper;

import com.fasterxml.jackson.databind.type.MapType;

import com.fasterxml.jackson.databind.type.TypeFactory;

import eu.etaxonomy.cdm.api.service.ITermService;

import eu.etaxonomy.cdm.api.service.IVocabularyService;

import eu.etaxonomy.cdm.api.service.dto.CondensedDistribution;

import eu.etaxonomy.cdm.api.util.DescriptionUtility;

import eu.etaxonomy.cdm.common.CdmUtils;

import eu.etaxonomy.cdm.hibernate.HibernateProxyHelper;

import eu.etaxonomy.cdm.model.common.Language;

import eu.etaxonomy.cdm.model.description.Distribution;

import eu.etaxonomy.cdm.model.description.PresenceAbsenceTerm;

import eu.etaxonomy.cdm.model.location.Country;

import eu.etaxonomy.cdm.model.location.NamedArea;

import eu.etaxonomy.cdm.model.location.NamedAreaLevel;

import eu.etaxonomy.cdm.model.location.Point;

import eu.etaxonomy.cdm.model.occurrence.SpecimenOrObservationType;

import eu.etaxonomy.cdm.model.term.Representation;

import eu.etaxonomy.cdm.model.term.TermType;

import eu.etaxonomy.cdm.model.term.TermVocabulary;

import eu.etaxonomy.cdm.strategy.cache.TaggedText;

/**

 * Class implementing the business logic for creating the map service string for

 * a given set of distributions. See {@link EditGeoService} as API for the given functionality.

 *

 * @see EditGeoService

 *

 * @author a.mueller

 * @since 17.11.2008

 */

public class EditGeoServiceUtilities {

    private static final Logger logger = Logger.getLogger(EditGeoServiceUtilities.class);

    private static final int INT_MAX_LENGTH = String.valueOf(Integer.MAX_VALUE).length();

    private static final String SUBENTRY_DELIMITER = ",";

    private static final String ID_FROM_VALUES_SEPARATOR = ":";

    private static final String VALUE_LIST_ENTRY_SEPARATOR = "|";

    private static final String VALUE_SUPER_LIST_ENTRY_SEPARATOR = "||";

    private static HashMap<SpecimenOrObservationType, Color> defaultSpecimenOrObservationTypeColors = new HashMap<>();

    static {

        defaultSpecimenOrObservationTypeColors.put(SpecimenOrObservationType.FieldUnit, Color.ORANGE);

        defaultSpecimenOrObservationTypeColors.put(SpecimenOrObservationType.DerivedUnit, Color.RED);

        defaultSpecimenOrObservationTypeColors.put(SpecimenOrObservationType.LivingSpecimen, Color.GREEN);

        defaultSpecimenOrObservationTypeColors.put(SpecimenOrObservationType.Observation, Color.ORANGE);

        defaultSpecimenOrObservationTypeColors.put(SpecimenOrObservationType.PreservedSpecimen, Color.GRAY);

        defaultSpecimenOrObservationTypeColors.put(SpecimenOrObservationType.Media, Color.BLUE);

    }

    private static HashMap<SpecimenOrObservationType, Color> getDefaultSpecimenOrObservationTypeColors() {

        return defaultSpecimenOrObservationTypeColors;

    }

    private static HashMap<PresenceAbsenceTerm, Color> defaultPresenceAbsenceTermBaseColors =  new HashMap<>();

    static {

        defaultPresenceAbsenceTermBaseColors = new HashMap<>();

        defaultPresenceAbsenceTermBaseColors.put(PresenceAbsenceTerm.PRESENT(), Color.decode("0x4daf4a"));

        defaultPresenceAbsenceTermBaseColors.put(PresenceAbsenceTerm.NATIVE(), Color.decode("0x4daf4a"));

        defaultPresenceAbsenceTermBaseColors.put(PresenceAbsenceTerm.NATIVE_DOUBTFULLY_NATIVE(), Color.decode("0x377eb8"));

        defaultPresenceAbsenceTermBaseColors.put(PresenceAbsenceTerm.CULTIVATED(), Color.decode("0x984ea3"));

        defaultPresenceAbsenceTermBaseColors.put(PresenceAbsenceTerm.INTRODUCED(), Color.decode("0xff7f00"));

        defaultPresenceAbsenceTermBaseColors.put(PresenceAbsenceTerm.CASUAL(), Color.decode("0xffff33"));

        defaultPresenceAbsenceTermBaseColors.put(PresenceAbsenceTerm.INTRODUCED_CULTIVATED(), Color.decode("0xa65628"));

        defaultPresenceAbsenceTermBaseColors.put(PresenceAbsenceTerm.NATURALISED(), Color.decode("0xf781bf"));

    }

    private static List<UUID>  presenceAbsenceTermVocabularyUuids = null;

    private static HashMap<PresenceAbsenceTerm, Color> getDefaultPresenceAbsenceTermBaseColors() {

        return defaultPresenceAbsenceTermBaseColors;

    }

    /**

     * @param filteredDistributions

     *            A set of distributions a condensed distribution string should

     *            be created for.

     *            The set should guarantee that for each area not more than

     *            1 status exists, otherwise the behavior is not deterministic.

     *            For filtering see {@link DescriptionUtility#filterDistributions(

     *            Collection, Set, boolean, boolean, boolean, boolean, boolean)}

     * @param config

     *            The configuration for the condensed distribution string creation.

     * @param languages

     *            A list of preferred languages in case the status or area symbols are

     *            to be taken from the language abbreviations (not really in use)

     *            TODO could be moved to configuration or fully removed

     * @return

     *            A CondensedDistribution object that contains a string representation

     *            and a {@link TaggedText} representation of the condensed distribution string.

     */

    public static CondensedDistribution getCondensedDistribution(Collection<Distribution> filteredDistributions,

            CondensedDistributionConfiguration config, List<Language> languages) {

        CondensedDistributionComposer composer = new CondensedDistributionComposer();

        CondensedDistribution condensedDistribution = composer.createCondensedDistribution(

                filteredDistributions, languages, config);

        return condensedDistribution;

    }

    /**

     * Returns the parameter String for the EDIT geo webservice to create a

     * distribution map.

     *

     * @param filteredDistributions

     *            A set of distributions that should be shown on the map.

     *            The set should guarantee that for each area not more than

     *            1 status exists, otherwise the behavior is not deterministic.

     *            For filtering see {@link DescriptionUtility#filterDistributions(

     *            Collection, Set, boolean, boolean, boolean, boolean, boolean)}

     * @param mapping

     *            Data regarding the mapping of NamedAreas to shape file

     *            attribute tables

     * @param presenceAbsenceTermColors

     *            A map that defines the colors of PresenceAbsenceTerms. The

     *            PresenceAbsenceTerms are defined by their uuid. If a

     *            PresenceAbsenceTerm is not included in this map, it's default

     *            color is taken instead. If the map == null all terms are

     *            colored by their default color.

     * @param projectToLayer

     *            name of a layer which is representing a specific

     *            {@link NamedAreaLevel} Supply this parameter if you to project

     *            all other distribution area levels to this layer.

     * @param languages

     *

     * @return the parameter string or an empty string if the

     *         <code>distributions</code> set was null or empty.

     */

    @Transient

    public static String getDistributionServiceRequestParameterString(

            Collection<Distribution> filteredDistributions,

            IGeoServiceAreaMapping mapping,

            Map<PresenceAbsenceTerm,Color> presenceAbsenceTermColors,

            String projectToLayer,

            List<Language> languages){

        /*

         * generateMultipleAreaDataParameters switches between the two possible styles:

         * 1. ad=layername1:area-data||layername2:area-data

         * 2. ad=layername1:area-data&ad=layername2:area-data

         */

        boolean generateMultipleAreaDataParameters = false;

        List<String>  perLayerAreaData = new ArrayList<>();

        Map<Integer, String> areaStyles = new HashMap<>();

        List<String> legendSortList = new ArrayList<>();

        String borderWidth = "0.1";

        String borderColorRgb = "";

        String borderDashingPattern = "";

        //handle empty set

        if(filteredDistributions == null || filteredDistributions.size() == 0){

            return "";

        }

        presenceAbsenceTermColors = mergeMaps(getDefaultPresenceAbsenceTermBaseColors(), presenceAbsenceTermColors);

        Map<String, Map<Integer, Set<Distribution>>> layerMap = new HashMap<>();

        List<PresenceAbsenceTerm> statusList = new ArrayList<>();

        groupStylesAndLayers(filteredDistributions, layerMap, statusList, mapping);

        Map<String, String> parameters = new HashMap<>();

        //style

        int styleCounter = 0;

        for (PresenceAbsenceTerm status: statusList){

            char styleCode = getStyleAbbrev(styleCounter);

            //getting the area title

            if (languages == null){

                languages = new ArrayList<>();

            }

            if (languages.size() == 0){

                languages.add(Language.DEFAULT());

            }

            Representation statusRepresentation = status.getPreferredRepresentation(languages);

            //getting the area color

            Color statusColor = presenceAbsenceTermColors.get(status);

            String fillColorRgb;

            if (statusColor != null){

                fillColorRgb = Integer.toHexString(statusColor.getRGB()).substring(2);

            }else{

                fillColorRgb = status.getDefaultColor(); //TODO

            }

            String styleValues = StringUtils.join(new String[]{fillColorRgb, borderColorRgb, borderWidth, borderDashingPattern}, ',');

            areaStyles.put(styleCounter, styleValues);

            String legendEntry = styleCode + ID_FROM_VALUES_SEPARATOR + encode(statusRepresentation.getLabel());

            legendSortList.add(StringUtils.leftPad(String.valueOf(status.getOrderIndex()), INT_MAX_LENGTH, '0') + legendEntry );

            styleCounter++;

        }

        // area data

        List<String> styledAreasPerLayer;

        List<String> areasPerStyle;

        /**

         * Map<Integer, Integer> styleUsage

         *

         * Used to avoid reusing styles in multiple layers

         *

         * key: the style id

         * value: the count of how often the style has been used for different layers, starts with 0 for first time use

         */

        Map<Integer, Integer> styleUsage = new HashMap<>();

        char styleChar;

        for (String layerString : layerMap.keySet()){

            // each layer

            styledAreasPerLayer = new ArrayList<>();

            Map<Integer, Set<Distribution>> styleMap = layerMap.get(layerString);

            for (int style: styleMap.keySet()){

                // stylesPerLayer

                styleChar = getStyleAbbrev(style);

                Set<Distribution> distributionSet = styleMap.get(style);

                areasPerStyle = new ArrayList<>();

                for (Distribution distribution: distributionSet){

                    // areasPerStyle

                    areasPerStyle.add(encode(getAreaCode(distribution, mapping)));

                }

                styledAreasPerLayer.add(styleChar + ID_FROM_VALUES_SEPARATOR + StringUtils.join(areasPerStyle.iterator(), SUBENTRY_DELIMITER));

            }

            perLayerAreaData.add(encode(layerString) + ID_FROM_VALUES_SEPARATOR + StringUtils.join(styledAreasPerLayer.iterator(), VALUE_LIST_ENTRY_SEPARATOR));

        }

        if(areaStyles.size() > 0){

            ArrayList<Integer> styleIds = new ArrayList<>(areaStyles.size());

            styleIds.addAll(areaStyles.keySet());

            Collections.sort(styleIds); // why is it necessary to sort here?

            StringBuilder db = new StringBuilder();

            for(Integer sid : styleIds){

                if(db.length() > 0){

                    db.append(VALUE_LIST_ENTRY_SEPARATOR);

                }

                db.append( getStyleAbbrev(sid)).append(ID_FROM_VALUES_SEPARATOR).append(areaStyles.get(sid));

            }

            parameters.put("as", db.toString());

        }

        if(legendSortList.size() > 0){

            // sort the label entries after the status terms

            Collections.sort(legendSortList);

            // since the status terms are have an inverse natural order

            // (as all other ordered term, see OrderedTermBase.performCompareTo(T orderedTerm, boolean skipVocabularyCheck)

            // the sorted list must be reverted

//            Collections.reverse(legendSortList);

            // remove the prepended order index (like 000000000000001 ) from the legend entries

            @SuppressWarnings("unchecked")

            Collection<String> legendEntries = CollectionUtils.collect(legendSortList, (o)->{

                      String s = ((String) o);

                      return s.substring(INT_MAX_LENGTH, s.length());

                  });

            parameters.put("title", StringUtils.join(legendEntries.iterator(), VALUE_LIST_ENTRY_SEPARATOR));

        }

        if(generateMultipleAreaDataParameters){

            // not generically possible since parameters can not contain duplicate keys with value "ad"

        } else {

            parameters.put("ad", StringUtils.join(perLayerAreaData.iterator(), VALUE_SUPER_LIST_ENTRY_SEPARATOR));

        }

        String queryString = makeQueryString(parameters);

        logger.debug("getDistributionServiceRequestParameterString(): " + queryString);

        return queryString;

    }

    /**

     * Fills the layerMap and the statusList

     *

     * @param distributions

     * @param layerMap see {@link #addAreaToLayerMap(Map, List, Distribution, NamedArea, IGeoServiceAreaMapping)}

     * @param statusList

     */

    private static void groupStylesAndLayers(Collection<Distribution> distributions,

            Map<String, Map<Integer,Set<Distribution>>> layerMap,

            List<PresenceAbsenceTerm> statusList,

            IGeoServiceAreaMapping mapping) {

        //iterate through distributions and group styles and layers

        //and collect necessary information

        for (Distribution distribution : distributions){

            //collect status

            PresenceAbsenceTerm status = distribution.getStatus();

            if(status == null){

                continue;

            }

            status = HibernateProxyHelper.deproxy(status);

            if (! statusList.contains(status)){

                statusList.add(status);

            }

            //group areas by layers and styles

            NamedArea area = distribution.getArea();

            addAreaToLayerMap(layerMap, statusList, distribution, area, mapping);

        }

    }

    /**

     * Adds the areas to the layer map. Areas which do not have layer information

     * mapped to them are ignored.

     * <p>

     * A layer map holds the following information:

     *

     * <ul>

     *   <li><b>String</b>: the WMSLayerName which matches the level of the

     *   contained distributions areas</li>

     *   <li><b>StyleMap</b>:</li>

     *   <ul>

     *     <li><b>Integer</b>: the index of the status in the

     *     <code>statusList</code></li>

     *     <li><b>Set{@code<Distribution>}</b>: the set of distributions having the

     *     same Status, the status list is populated in {@link #groupStylesAndLayers(Set, Map, List, IGeoServiceAreaMapping)}</li>

     *   </ul>

     * </ul>

     *

     * @param layerMap

     * @param statusList

     * @param distribution

     * @param area

     */

    private static void addAreaToLayerMap(Map<String, Map<Integer,

            Set<Distribution>>> layerMap,

            List<PresenceAbsenceTerm> statusList,

            Distribution distribution,

            NamedArea area,

            IGeoServiceAreaMapping mapping) {

        if (area != null){

            String geoLayerName = getWMSLayerName(area, mapping);

            if(geoLayerName == null){

               logger.warn("no wms layer mapping defined for " + area.getLabel() + " [" + area.getIdInVocabulary() + "]");

            } else {

                Map<Integer, Set<Distribution>> styleMap = layerMap.get(geoLayerName);

                if (styleMap == null) {

                    styleMap = new HashMap<>();

                    layerMap.put(geoLayerName, styleMap);

                }

                addDistributionToStyleMap(distribution, styleMap, statusList);

            }

        }

    }

    /**

     * URI encode the given String

     */

    private static String encode(String string) {

        String encoded = string;

        try {

            encoded = URLEncoder.encode(string, "UTF-8");

        } catch (UnsupportedEncodingException e) {

            logger.error(e);

        }

        return encoded;

    }

    /**

     * combine parameter into a URI query string fragment. The values will be

     * escaped correctly.

     *

     * @param parameters

     * @return a URI query string fragment

     */

    private static String makeQueryString(Map<String, String> parameters){

        StringBuilder queryString = new StringBuilder();

        for (String key : parameters.keySet()) {

            if(queryString.length() > 0){

                queryString.append('&');

            }

            if(key.equals("od") || key.equals("os") || key.equals("ms") || key.equals("ad") || key.equals("as") || key.equals("title") || key.equals("bbox")){

                queryString.append(key).append('=').append(parameters.get(key));

            } else {

                queryString.append(key).append('=').append(encode(parameters.get(key)));

            }

        }

        return queryString.toString();

    }

    private static String getAreaCode(Distribution distribution, IGeoServiceAreaMapping mapping){

        NamedArea area = distribution.getArea();

        TermVocabulary<NamedArea> voc = area.getVocabulary();

        String result = null;

        if (voc != null && (voc.getUuid().equals(NamedArea.uuidTdwgAreaVocabulary) ||  voc.getUuid().equals(Country.uuidCountryVocabulary))) {

            // TDWG or Country

            result = area.getIdInVocabulary();

            if (area.getLevel() != null && area.getLevel().equals(NamedAreaLevel.TDWG_LEVEL4())) {

                result = result.replace("-", "");

            }

        } else {

            // use generic GeoServiceArea data stored in technical annotations

            // of the

            // named area

            GeoServiceArea areas = mapping.valueOf(area);

            if (areas != null && areas.size() > 0) {

                // FIXME multiple layers

                List<String> values = areas.getAreasMap().values().iterator().next().values().iterator().next();

                for (String value : values) {

                    result = CdmUtils.concat(SUBENTRY_DELIMITER, result, value);

                }

            }

        }

        return CdmUtils.Nz(result, "-");

    }

    private static List<String> projectToWMSSubLayer(NamedArea area){

        List<String> layerNames = new ArrayList<>();

        String matchedLayerName = null;

        TermVocabulary<NamedArea> voc = area.getVocabulary();

        //TDWG areas

        if (voc.getUuid().equals(NamedArea.uuidTdwgAreaVocabulary)){

            NamedAreaLevel level = area.getLevel();

            if (level != null) {

                //TODO integrate into CDM

                if (level.equals(NamedAreaLevel.TDWG_LEVEL1())) {

                    matchedLayerName = "tdwg1" ;

                } else if (level.equals(NamedAreaLevel.TDWG_LEVEL2())) {

                    matchedLayerName = "tdwg2";

                }else if (level.equals(NamedAreaLevel.TDWG_LEVEL3())) {

                    matchedLayerName = "tdwg3";

                }else if (level.equals(NamedAreaLevel.TDWG_LEVEL4())) {

                    matchedLayerName = "tdwg4";

                }

            }

            //unrecognized tdwg area

        }

        //TODO countries

        // check if the matched layer equals the layer to project to

        // if not: recurse into the sub-level in order to find the specified one.

        String[] matchedLayerNameTokens = StringUtils.split(matchedLayerName, ':');

//		if(matchedLayerNameTokens.length > 0 &&  matchedLayerNameTokens[0] != projectToLayer){

//			for (NamedArea subArea : area.getIncludes()){

//

//			}

            //

            // add all sub areas

//		}

        return null;

    }

    private static String getWMSLayerName(NamedArea area, IGeoServiceAreaMapping mapping){

        TermVocabulary<NamedArea> voc = area.getVocabulary();

        //TDWG areas

        if (voc.getUuid().equals(NamedArea.uuidTdwgAreaVocabulary)){

            NamedAreaLevel level = area.getLevel();

            if (level != null) {

                //TODO integrate into CDM

                if (level.equals(NamedAreaLevel.TDWG_LEVEL1())) {

                    return "tdwg1";

                } else if (level.equals(NamedAreaLevel.TDWG_LEVEL2())) {

                    return "tdwg2";

                }else if (level.equals(NamedAreaLevel.TDWG_LEVEL3())) {

                    return "tdwg3";

                }else if (level.equals(NamedAreaLevel.TDWG_LEVEL4())) {

                    return "tdwg4";

                }

            }

            //unrecognized tdwg area

            return null;

        }else if (voc.getUuid().equals(Country.uuidCountryVocabulary)){

            return "country_earth:gmi_cntry";

        }

        GeoServiceArea areas = mapping.valueOf(area);

        if (areas != null && areas.getAreasMap().size() > 0){

            //FIXME multiple layers

            String layer = areas.getAreasMap().keySet().iterator().next();

            Map<String, List<String>> fields = areas.getAreasMap().get(layer);

            String field = fields.keySet().iterator().next();

            String layerString = layer + ":" + field;

            return layerString.toLowerCase();

        }

        return null;

    }

    private static void addDistributionToStyleMap(Distribution distribution, Map<Integer, Set<Distribution>> styleMap,

            List<PresenceAbsenceTerm> statusList) {

        PresenceAbsenceTerm status = distribution.getStatus();

        if (status != null) {

            int style = statusList.indexOf(status);

            Set<Distribution> distributionSet = styleMap.get(style);

            if (distributionSet == null) {

                distributionSet = new HashSet<Distribution>();

                styleMap.put(style, distributionSet);

            }

            distributionSet.add(distribution);

        }

    }

    /**

     * @param fieldUnitPoints

     * @param derivedUnitPoints

     * @param specimenOrObservationTypeColors

     * @param width

     * @param height

     * @param bbox

     * @param backLayer

     * @return

     * e.g.:

     * 	l=v%3Aatbi%2Ce_w_0

     *  &legend=0

     *  &image=false

     *  &recalculate=false

     *  &ms=400%2C350

     *  &od=1%3A44.29481%2C6.82161|44.29252%2C6.822873|44.29247%2C6.82346|44.29279%2C6.823678|44.29269%2C6.82394|44.28482%2C6.887252|44.11469%2C7.287144|44.11468%2C7.289168

     *  &os=1%3Ac%2FFFD700%2F10%2FAporrectodea caliginosa

     */

    public static OccurrenceServiceRequestParameterDto getOccurrenceServiceRequestParameterString(

            List<Point> fieldUnitPoints,

            List<Point> derivedUnitPoints,

            Map<SpecimenOrObservationType, Color> specimenOrObservationTypeColors) {

        OccurrenceServiceRequestParameterDto dto = new OccurrenceServiceRequestParameterDto();

        specimenOrObservationTypeColors = mergeMaps(getDefaultSpecimenOrObservationTypeColors(), specimenOrObservationTypeColors);

        Map<String, String> parameters = new HashMap<>();

        parameters.put("legend", "0");

        Map<String, String> styleAndData = new HashMap<>();

        addToStyleAndData(fieldUnitPoints, SpecimenOrObservationType.FieldUnit, specimenOrObservationTypeColors, styleAndData);

        addToStyleAndData(derivedUnitPoints, SpecimenOrObservationType.DerivedUnit, specimenOrObservationTypeColors, styleAndData);

        parameters.put("os", StringUtils.join(styleAndData.keySet().iterator(), "||"));

        parameters.put("od", StringUtils.join(styleAndData.values().iterator(), "||"));

        String queryString = makeQueryString(parameters);

        dto.setFieldUnitPoints(fieldUnitPoints);

        dto.setDerivedUnitPoints(derivedUnitPoints);

        dto.setOccurrenceQuery(queryString);

        logger.info(queryString);

        return dto;

    }

    private static <T, S> Map<T, S> mergeMaps(Map<T, S> defaultMap, Map<T, S> overrideMap) {

        Map<T, S> tmpMap = new HashMap<T, S>();

        tmpMap.putAll(defaultMap);

        if(overrideMap != null){

            tmpMap.putAll(overrideMap);

        }

        return tmpMap;

    }

    private static void addToStyleAndData(

            List<Point> points,

            SpecimenOrObservationType specimenOrObservationType,

            Map<SpecimenOrObservationType, Color> specimenOrObservationTypeColors, Map<String, String> styleAndData) {

        //TODO add markerShape and size and Label to specimenOrObservationTypeColors -> Map<Class<SpecimenOrObservationBase<?>>, MapStyle>

        if(points != null && points.size()>0){

            String style =  "c/" + Integer.toHexString(specimenOrObservationTypeColors.get(specimenOrObservationType).getRGB()).substring(2) + "/10/noLabel";

            StringBuilder data = new StringBuilder();

            for(Point point : points){

                if (point != null){  //should not be null, but just in case

                    if(data.length() > 0){

                        data.append('|');

                    }

                    data.append(point.getLatitude() + "," + point.getLongitude());

                }

            }

            int index = styleAndData.size() + 1;

            styleAndData.put(index + ":" +style, index + ":" +data.toString());

        }

    }

    /**

     * transform an integer (style counter) into a valid character representing a style.

     * 0-25 => a-z<br>

     * 26-51 => A-Z<br>

     * i not in {0,...,51} is undefined

     */

    private static char getStyleAbbrev(int i){

        i++;

        int ascii = 96 + i;

        if (i >26){

            ascii = 64 + i;

        }

        return (char)ascii;

    }

    /**

     * @param statusColorJson for example: {@code {"n":"#ff0000","p":"#ffff00"}}

     */

    public static Map<PresenceAbsenceTerm, Color> buildStatusColorMap(String statusColorJson,

            ITermService termService, IVocabularyService vocabularyService)

            throws IOException, JsonParseException, JsonMappingException {

        Map<PresenceAbsenceTerm, Color> presenceAbsenceTermColors = null;

        if(StringUtils.isNotEmpty(statusColorJson)){

            ObjectMapper mapper = new ObjectMapper();

            // TODO cache the color maps to speed this up?

            TypeFactory typeFactory = mapper.getTypeFactory();

            MapType mapType = typeFactory.constructMapType(HashMap.class, String.class, String.class);

            Map<String,String> statusColorMap = mapper.readValue(statusColorJson, mapType);

            presenceAbsenceTermColors = new HashMap<>();

            PresenceAbsenceTerm paTerm = null;

            for(String statusId : statusColorMap.keySet()){

                try {

                    Color color = Color.decode(statusColorMap.get(statusId));

                    // the below loop is  a hack for #4522 (custom status colors not working in cyprus portal)

                    // remove it once the ticket is solved

                    for(UUID vocabUuid : presenceAbsenceTermVocabularyUuids(vocabularyService)) {

                        paTerm = termService.findByIdInVocabulary(statusId, vocabUuid, PresenceAbsenceTerm.class);

                        if(paTerm != null) {

                            break;

                        }

                    }

                    if(paTerm != null){

                        presenceAbsenceTermColors.put(paTerm, color);

                    }

                } catch (NumberFormatException e){

                    logger.error("Cannot decode color", e);

                }

            }

        }

        return presenceAbsenceTermColors;

    }

    /**

     * this is a hack for #4522 (custom status colors not working in cyprus portal)

     * remove this method once the ticket is solved

     *

     * @param vocabularyService

     * @return

     */

    private static List<UUID> presenceAbsenceTermVocabularyUuids(IVocabularyService vocabularyService) {

        if(EditGeoServiceUtilities.presenceAbsenceTermVocabularyUuids == null) {

            List<UUID> uuids = new ArrayList<>();

            // the default as first entry

            UUID presenceTermVocabUuid = PresenceAbsenceTerm.NATIVE().getVocabulary().getUuid();

            uuids.add(presenceTermVocabUuid);

            for(TermVocabulary<?> vocab : vocabularyService.findByTermType(TermType.PresenceAbsenceTerm, null)) {

                if(!uuids.contains(vocab.getUuid())) {

                    uuids.add(vocab.getUuid());

                }

            }

            EditGeoServiceUtilities.presenceAbsenceTermVocabularyUuids = uuids;

        }

        return EditGeoServiceUtilities.presenceAbsenceTermVocabularyUuids;

    }

}