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using System;
using System.Collections.Generic;
using System.Device.Location;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.Phone.Maps.Services;
namespace Xamarin.Forms.Maps.WP8
{
internal class GeocoderBackend
{
// Eventually this should be sanely set to match either where the map is centered or where the user is.
internal static Position PositionForGeocoding { get; set; }
public static void Register()
{
Geocoder.GetPositionsForAddressAsyncFunc = GetPositionsForAddress;
Geocoder.GetAddressesForPositionFuncAsync = GetAddressesForPositionAsync;
}
// Thank you to craig dunn
static string AddressToString(MapAddress address)
{
string building = "", house = "", city = "", country = "";
var bldg = new List<string>();
if (!"".Equals(address.BuildingRoom))
bldg.Add(address.BuildingRoom);
if (!"".Equals(address.BuildingFloor))
bldg.Add(address.BuildingFloor);
if (!"".Equals(address.BuildingName))
bldg.Add(address.BuildingName);
if (!"".Equals(address.BuildingZone))
bldg.Add(address.BuildingZone);
if (bldg.Count > 0)
building = string.Join(" ", bldg) + Environment.NewLine;
var hs = new List<string>();
if (!"".Equals(address.HouseNumber))
hs.Add(address.HouseNumber);
if (!"".Equals(address.Street))
hs.Add(address.Street);
if (hs.Count > 0)
house = string.Join(" ", hs) + Environment.NewLine;
var cs = new List<string>();
if (!"".Equals(address.City))
cs.Add(address.City);
if (!"".Equals(address.State))
cs.Add(address.State);
else if (!"".Equals(address.Province))
cs.Add(address.Province);
if (!"".Equals(address.PostalCode))
cs.Add(address.PostalCode);
if (cs.Count > 0)
city = string.Join(" ", cs) + Environment.NewLine;
if (!"".Equals(address.Country))
country = address.Country;
return building + house + city + country;
}
static Task<IEnumerable<string>> GetAddressesForPositionAsync(Position position)
{
var source = new TaskCompletionSource<IEnumerable<string>>();
var query = new ReverseGeocodeQuery
{
GeoCoordinate = new GeoCoordinate(position.Latitude, position.Longitude)
};
query.QueryCompleted +=
(sender, args) => source.SetResult(args.Result.Select(r => AddressToString(r.Information.Address)).ToArray());
query.QueryAsync();
return source.Task;
}
static Task<IEnumerable<Position>> GetPositionsForAddress(string s)
{
var source = new TaskCompletionSource<IEnumerable<Position>>();
var query = new GeocodeQuery
{
SearchTerm = s,
GeoCoordinate = new GeoCoordinate(PositionForGeocoding.Latitude, PositionForGeocoding.Longitude)
};
query.QueryCompleted +=
(sender, args) =>
source.SetResult(
args.Result.Select(r => new Position(r.GeoCoordinate.Latitude, r.GeoCoordinate.Longitude)).ToArray());
query.QueryAsync();
return source.Task;
}
}
}
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