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/*
 * Copyright (C) 2006, 2011.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3 or
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 */

package uk.me.parabola.mkgmap.reader.osm.boundary;

import java.util.ArrayList;
import java.util.Map.Entry;

import uk.me.parabola.log.Logger;
import uk.me.parabola.mkgmap.reader.osm.Element;
import uk.me.parabola.mkgmap.reader.osm.ElementSaver;
import uk.me.parabola.mkgmap.reader.osm.Node;
import uk.me.parabola.mkgmap.reader.osm.OsmConverter;
import uk.me.parabola.mkgmap.reader.osm.Relation;
import uk.me.parabola.mkgmap.reader.osm.Way;
import uk.me.parabola.util.EnhancedProperties;

/**
 * This saver only keeps ways or relations with boundaries. Used to prepare the dat for the bounds file.
 *
 * @author WanMil
 */

public class BoundaryElementSaver extends ElementSaver {
        private static final Logger log = Logger.getLogger(BoundaryElementSaver.class);

        private final BoundarySaver saver;
        private final BoundaryLocationPreparer preparer;
       
        public BoundaryElementSaver(EnhancedProperties args, BoundarySaver saver) {
                super(args);
                this.saver = saver;
                preparer = new BoundaryLocationPreparer(new EnhancedProperties());
        }

        /**
         * Checks if the given element is an administrative boundary or a
         * postal code area (or both).
         * @param element an element
         * @return <code>true</code> if administrative boundary or postal code;
         * <code>false</code> element cannot be used for precompiled bounds
         */

        public boolean isBoundary(Element element) {
                if (element instanceof Relation) {
                        String type = element.getTag("type");
                        if (!"boundary".equals(type) && !"multipolygon".equals(type))
                                return false;
                } else if (element instanceof Way) {
                        Way w = (Way) element;
                        // a single way must be closed
                        if (w.isClosedInOSM() == false) {
                                return false;
                        }
                } else {
                        return false;
                }
                return hasRelevantTags(element);
        }

        private boolean hasRelevantTags(Element element) {
                BoundaryLocationInfo bInfo = preparer.parseTags(element);
                if (bInfo.getZip() != null)
                        return true;
                if (bInfo.getAdmLevel() == BoundaryLocationPreparer.UNSET_ADMIN_LEVEL)
                        return false;
                if (bInfo.getName() != null && !"?".equals(bInfo.getName()))
                        return true;
                if (bInfo.getAdmLevel() >= 3 && bInfo.getAdmLevel() <= 11) {
                        // for admin_level != 2 it is enough when we find a tag key containing "name" (like int_name or name:en)  
                        for (Entry<String,String> tag : element.getTagEntryIterator()) {
                                if (tag.getKey().contains("name")) {
                                        return true;
                                }
                        }
                }
                return false;
        }
       
        public void addRelation(Relation rel) {
                if (isBoundary(rel)) {
                        BoundaryRelation bRel = (BoundaryRelation) createMultiPolyRelation(rel);
                        bRel.processElements();
                        Boundary b = bRel.getBoundary();
                        if (b != null)
                                saver.addBoundary(b);
                } else {
                        log.warn("Relation is not processed due to missing tags:", rel.getId(), rel.toTagString());
                }
        }
       
        public void deferRelation(long id, Relation rel, String role) {
                return;
        }
       
        public Relation createMultiPolyRelation(Relation rel) {
                return new BoundaryRelation(rel, wayMap, getBoundingBox());
        }

        public void addNode(Node node) {
        }

        public void convert(OsmConverter converter) {
                nodeMap = null;

                converter.setBoundingBox(getBoundingBox());

                ArrayList<Relation> relations = new ArrayList<>(relationMap.values());
                relationMap = null;
                for (int i = 0; i < relations.size(); i++) {
                        converter.convertRelation(relations.get(i));
                        relations.set(i, null);
                }
                relations = null;

                for (Way w : wayMap.values()) {
                        if (isBoundary(w)) {
                                converter.convertWay(w);
                        }
                }

                wayMap = null;

                converter.end();
        }
}