package com.osmand.osm.io;

import static com.osmand.osm.io.OsmBaseStorage.ATTR_ID;
import static com.osmand.osm.io.OsmBaseStorage.ATTR_K;
import static com.osmand.osm.io.OsmBaseStorage.ATTR_LAT;
import static com.osmand.osm.io.OsmBaseStorage.ATTR_LON;
import static com.osmand.osm.io.OsmBaseStorage.ATTR_REF;
import static com.osmand.osm.io.OsmBaseStorage.ATTR_ROLE;
import static com.osmand.osm.io.OsmBaseStorage.ATTR_TYPE;
import static com.osmand.osm.io.OsmBaseStorage.ATTR_V;
import static com.osmand.osm.io.OsmBaseStorage.ATTR_VERSION;
import static com.osmand.osm.io.OsmBaseStorage.ELEM_MEMBER;
import static com.osmand.osm.io.OsmBaseStorage.ELEM_ND;
import static com.osmand.osm.io.OsmBaseStorage.ELEM_NODE;
import static com.osmand.osm.io.OsmBaseStorage.ELEM_OSM;
import static com.osmand.osm.io.OsmBaseStorage.ELEM_RELATION;
import static com.osmand.osm.io.OsmBaseStorage.ELEM_TAG;
import static com.osmand.osm.io.OsmBaseStorage.ELEM_WAY;
import static com.osmand.osm.io.OsmIndexStorage.*;

import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Stack;
import java.util.Map.Entry;

import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamWriter;

import com.osmand.Algoritms;
import com.osmand.data.Amenity;
import com.osmand.data.Building;
import com.osmand.data.City;
import com.osmand.data.MapObject;
import com.osmand.data.Region;
import com.osmand.data.Street;
import com.osmand.data.Amenity.AmenityType;
import com.osmand.data.City.CityType;
import com.osmand.osm.Entity;
import com.osmand.osm.LatLon;
import com.osmand.osm.Node;
import com.osmand.osm.Relation;
import com.osmand.osm.Way;
import com.sun.org.apache.xerces.internal.impl.PropertyManager;
import com.sun.xml.internal.stream.writers.XMLStreamWriterImpl;

public class OSMStorageWriter {

	private final String INDENT = "    ";
	private final String INDENT2 = INDENT + INDENT;
	private final String INDENT3 = INDENT + INDENT + INDENT;


	public OSMStorageWriter(){
	}
	
	
	public void saveStorage(OutputStream output, OsmBaseStorage storage, Collection<Long> interestedObjects, boolean includeLinks) throws XMLStreamException, IOException {
		Map<Long, Entity> entities = storage.getRegisteredEntities();
		PropertyManager propertyManager = new PropertyManager(PropertyManager.CONTEXT_WRITER);
//		transformer.setOutputProperty(OutputKeys.INDENT, "yes");
//        String indent = "{http://xml.apache.org/xslt}indent-amount";
//        transformer.setOutputProperty(indent, "4");
        
        
		XMLStreamWriter streamWriter = new XMLStreamWriterImpl(output, propertyManager);
		List<Node> nodes = new ArrayList<Node>();
		List<Way> ways = new ArrayList<Way>();
		List<Relation> relations = new ArrayList<Relation>();
		if(interestedObjects == null){
			interestedObjects = entities.keySet();
		}
		Stack<Long> toResolve = new Stack<Long>();
		toResolve.addAll(interestedObjects);
		while(!toResolve.isEmpty()){
			Long l = toResolve.pop();
			if(entities.get(l) instanceof Node){
				nodes.add((Node) entities.get(l));
			} else if(entities.get(l) instanceof Way){
				ways.add((Way) entities.get(l));
				if(includeLinks){
					toResolve.addAll(((Way)entities.get(l)).getNodeIds());
				}
			} else if(entities.get(l) instanceof Relation){
				relations.add((Relation) entities.get(l));
				if(includeLinks){
					toResolve.addAll(((Relation)entities.get(l)).getMemberIds());
				}
			}
		}
		
		
		streamWriter.writeStartDocument();
		
		writeStartElement(streamWriter, ELEM_OSM, "");
		streamWriter.writeAttribute(ATTR_VERSION, "0.6");
		for(Node n : nodes){
			writeStartElement(streamWriter, ELEM_NODE, INDENT);
			streamWriter.writeAttribute(ATTR_LAT, n.getLatitude()+"");
			streamWriter.writeAttribute(ATTR_LON, n.getLongitude()+"");
			streamWriter.writeAttribute(ATTR_ID, n.getId()+"");
			writeTags(streamWriter, n);
			writeEndElement(streamWriter, INDENT);
		}
		
		for(Way w : ways){
			writeStartElement(streamWriter, ELEM_WAY, INDENT);
			streamWriter.writeAttribute(ATTR_ID, w.getId()+"");
			for(Long r : w.getNodeIds()){
				writeStartElement(streamWriter, ELEM_ND, INDENT2);
				streamWriter.writeAttribute(ATTR_REF, r+"");
				writeEndElement(streamWriter, INDENT2);
			}
			writeTags(streamWriter, w);
			writeEndElement(streamWriter, INDENT);
		}
		
		for(Relation r : relations){
			writeStartElement(streamWriter, ELEM_RELATION, INDENT);
			streamWriter.writeAttribute(ATTR_ID, r.getId()+"");
			for(Entry<Long, String> e : r.getMembersMap().entrySet()){
				writeStartElement(streamWriter, ELEM_MEMBER, INDENT2);
				streamWriter.writeAttribute(ATTR_REF, e.getKey()+"");
				String s = e.getValue();
				if(s == null){
					s = ""; 
				}
				streamWriter.writeAttribute(ATTR_ROLE, s);
				streamWriter.writeAttribute(ATTR_TYPE, getEntityType(entities, e.getKey()));
				writeEndElement(streamWriter, INDENT2);
			}
			writeTags(streamWriter, r);
			writeEndElement(streamWriter, INDENT);
		}
		
		writeEndElement(streamWriter, ""); // osm
		streamWriter.writeEndDocument();
		streamWriter.flush();
	}
	
	private String getEntityType(Map<Long, Entity> entities , Long id){
		Entity e = entities.get(id);
		if(e instanceof Way){
			return "way";
		} else if(e instanceof Relation){
			return "relation";
		} 
		return "node";
	}
	
	
	public void savePOIIndex(OutputStream output, Region region) throws XMLStreamException, IOException {
		PropertyManager propertyManager = new PropertyManager(PropertyManager.CONTEXT_WRITER);
		XMLStreamWriter streamWriter = new XMLStreamWriterImpl(output, propertyManager);

		writeStartElement(streamWriter, ELEM_OSMAND, "");
		streamWriter.writeAttribute(ATTR_VERSION, OSMAND_VERSION);
		List<Amenity> amenities = region.getAmenityManager().getAllObjects();
		for(Amenity n : amenities){
			if (couldBeWrited(n)) {
				writeStartElement(streamWriter, ELEM_AMENITY, INDENT);
				writeAttributesMapObject(streamWriter, n);
				streamWriter.writeAttribute(ATTR_TYPE, AmenityType.valueToString(n.getType()));
				streamWriter.writeAttribute(ATTR_SUBTYPE, n.getSubType());
				writeEndElement(streamWriter, INDENT);
			}
		}
		writeEndElement(streamWriter, ""); // osmand
		streamWriter.writeEndDocument();
		streamWriter.flush();
	}
	
	private void writeCity(XMLStreamWriter streamWriter, City c) throws XMLStreamException{
		writeStartElement(streamWriter, ELEM_CITY, INDENT);
		writeAttributesMapObject(streamWriter, c);
		streamWriter.writeAttribute(ATTR_CITYTYPE, CityType.valueToString(c.getType()));
		for(Street s : c.getStreets()){
			if (couldBeWrited(s)) {
				writeStartElement(streamWriter, ELEM_STREET, INDENT2);
				writeAttributesMapObject(streamWriter, s);
				for(Building b : s.getBuildings()) {
					if (couldBeWrited(b)) {
						writeStartElement(streamWriter, ELEM_BUILDING, INDENT3);
						writeAttributesMapObject(streamWriter, b);
						writeEndElement(streamWriter, INDENT3);
					}
				}
				writeEndElement(streamWriter, INDENT2);
			}
		}
		writeEndElement(streamWriter, INDENT);
	}
	
	public void saveAddressIndex(OutputStream output, Region region) throws XMLStreamException, IOException {
		PropertyManager propertyManager = new PropertyManager(PropertyManager.CONTEXT_WRITER);
		XMLStreamWriter streamWriter = new XMLStreamWriterImpl(output, propertyManager);

		writeStartElement(streamWriter, ELEM_OSMAND, "");
		streamWriter.writeAttribute(ATTR_VERSION, OSMAND_VERSION);
		for(CityType t : CityType.values()){
			Collection<City> cities = region.getCitiesByType(t);
			if(cities != null){
				for(City c : cities){
					if (couldBeWrited(c)) {
						writeCity(streamWriter, c);
					}
				}
			}
		}
		writeEndElement(streamWriter, ""); // osmand
		streamWriter.writeEndDocument();
		streamWriter.flush();
	}
	
	public boolean couldBeWrited(MapObject<? extends Entity> e){
		if(!Algoritms.isEmpty(e.getName()) && e.getLocation() != null){
			return true;
		}
		return false;
	}
	
	public void writeAttributesMapObject(XMLStreamWriter streamWriter, MapObject<? extends Entity> e) throws XMLStreamException{
		LatLon location = e.getLocation();
		streamWriter.writeAttribute(ATTR_LAT, location.getLatitude()+"");
		streamWriter.writeAttribute(ATTR_LON, location.getLongitude()+"");
		streamWriter.writeAttribute(ATTR_NAME, e.getName());
		streamWriter.writeAttribute(ATTR_ID, e.getId()+"");
	}
	

	
	private void writeStartElement(XMLStreamWriter writer, String name, String indent) throws XMLStreamException{
		writer.writeCharacters("\n"+indent);
		writer.writeStartElement(name);
	}
	
	private void writeEndElement(XMLStreamWriter writer, String indent) throws XMLStreamException{
		writer.writeCharacters("\n"+indent);
		writer.writeEndElement();
	}
	
	private void writeTags(XMLStreamWriter writer, Entity e) throws XMLStreamException{
		for(Entry<String, String> en : e.getTags().entrySet()){
			writeStartElement(writer, ELEM_TAG, INDENT2);
			writer.writeAttribute(ATTR_K, en.getKey());
			writer.writeAttribute(ATTR_V, en.getValue());
			writer.writeEndElement();
		}
	}
}