package com.osmand.data;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.osmand.Algoritms;
import com.osmand.data.City.CityType;
import com.osmand.osm.Entity;
import com.osmand.osm.LatLon;
import com.osmand.osm.MapUtils;
import com.osmand.osm.Node;
import com.osmand.osm.OSMSettings.OSMTagKey;

public class Region {
	private Entity entity;
	
	private DataTileManager<Amenity> amenities = new DataTileManager<Amenity>();
	
	private Map<CityType, Collection<City>> cities = new HashMap<CityType, Collection<City>>();
	{
		for(CityType type : CityType.values()){
			cities.put(type, new ArrayList<City>());
		}
	}
	
	
	public Region(Entity entity){
		this.entity = entity;
	}
	
	
	public void setEntity(Entity e){
		this.entity = e;
	}
	
	public String getName(){
		return entity == null ? "" : entity.getTag(OSMTagKey.NAME);
	}
	
	public Collection<City> getCitiesByType(CityType type){
		return cities.get(type);
	}
	
	public Collection<City> getCitiesByName(String name){
		return getCityByName(name, true, Integer.MAX_VALUE);
	}
	
	public Collection<City> getSuggestedCities(String name, int number){
		return getCityByName(name, false, number);
	}
	
	protected Collection<City> getCityByName(String name, boolean exactMatch, int number){
		List<City> l = new ArrayList<City>();
		for(CityType type : CityType.values()){
			for(City c : cities.get(type)){
				if( (exactMatch && c.getName().equalsIgnoreCase(name)) || 
					(!exactMatch && c.getName().toLowerCase().startsWith(name.toLowerCase())
							)){
						l.add(c);
						if(l.size() >= number){
							break;
					}
				}
			}
		}
		return l;
	}
	
	public City getClosestCity(LatLon point){
		City closest = null;
		double relDist = Double.POSITIVE_INFINITY;
		for(CityType t : CityType.values()){
			for(City c : cities.get(t)){
				double rel = MapUtils.getDistance(c.getNode(), point) / t.getRadius();
				if(rel < 1) {
					return c; // we are in that city
				}
				if(rel < relDist){
					closest = c;
					relDist = rel;
				}
			}
		}
		return closest;
	}
	
	public List<Amenity> getClosestAmenities(double latitude, double longitude){
		return amenities.getClosestObjects(latitude, longitude, 2);
	}
	
	public void registerAmenity(Amenity a){
		amenities.registerObject(a.getNode().getLatitude(), a.getNode().getLongitude(), a);
	}

	
	public City registerCity(Node c){
		City city = new City(c);
		if(city.getType() != null && !Algoritms.isEmpty(city.getName())){
			cities.get(city.getType()).add(city);
			return city;
		}
		return null;
	}
	
	
	

}