public void FindDrivers()
{
findDriverRef.ObserveSingleEvent(DataEventType.Value, (DataSnapshot snapshot) =>
{
if (snapshot.GetValue <NSObject>() != null)
{
//Converts Datasnapshot to a dictionary to retrieve the keys;
var snapShotData = snapshot.GetValue <NSDictionary>();
foreach (NSString key in snapShotData.Keys)
{
if (snapshot.GetChildSnapshot(key).GetChildSnapshot("ride_id").GetValue <NSObject>() != NSNull.Null)
{
string ride_id = snapshot.GetChildSnapshot(key).GetChildSnapshot("ride_id").GetValue <NSObject>().ToString();
if (ride_id == "waiting")
{
// Fetch Location Coordinates
string latitudeString = snapshot.GetChildSnapshot(key).GetChildSnapshot("location").GetChildSnapshot("latitude").GetValue <NSObject>().ToString();
string longitudeString = snapshot.GetChildSnapshot(key).GetChildSnapshot("location").GetChildSnapshot("longitude").GetValue <NSObject>().ToString();
CLLocationCoordinate2D driverLocation = new CLLocationCoordinate2D(double.Parse(latitudeString), double.Parse(longitudeString));
// Compute Distance Between Pickup Location and Driver Location (KM)
double distanceFromPickup = (Google.Maps.GeometryUtils.Distance(pickupLocation, driverLocation)) / 1000;
if (distanceFromPickup <= 50)
{
// available driver
AvailableDriver driver = new AvailableDriver();
driver.ID = key;
driver.DistanceFromPickup = distanceFromPickup;
availableDrivers.Add(driver);
}
}
}
}
if (availableDrivers.Count > 0)
{
// Sort drivers to closest distance
availableDrivers = availableDrivers.OrderBy(o => o.DistanceFromPickup).ToList();
DriversFound?.Invoke(this, new DriversFoundEventArgs {
Drivers = availableDrivers
});
}
else
{
DriverNotFound.Invoke(this, new EventArgs());
}
}
});
}
public void OnDataChange(DataSnapshot snapshot)
{
if (snapshot.Value != null)
{
var child = snapshot.Children.ToEnumerable <DataSnapshot>();
availableDrivers.Clear();
foreach (DataSnapshot data in child)
{
if (data.Child("ride_id").Value != null)
{
if (data.Child("ride_id").Value.ToString() == "waiting")
{
//Get Driver Location
double latitude = double.Parse(data.Child("location").Child("latitude").Value.ToString());
double longitude = double.Parse(data.Child("location").Child("longitude").Value.ToString());
LatLng driverLocation = new LatLng(latitude, longitude);
AvailableDriver driver = new AvailableDriver();
//compute Distance between Pickup Location and Driver Location
driver.DistanceFromPickup = SphericalUtil.ComputeDistanceBetween(mPickupLoction, driverLocation);
driver.ID = data.Key;
availableDrivers.Add(driver);
}
}
}
if (availableDrivers.Count > 0)
{
availableDrivers = availableDrivers.OrderBy(o => o.DistanceFromPickup).ToList();
DriversFound?.Invoke(this, new DriverFoundEventArgs {
Drivers = availableDrivers
});
}
else
{
DriverNotFound.Invoke(this, new EventArgs());
}
}
else
{
DriverNotFound.Invoke(this, new EventArgs());
}
}
public void Create(List <ActiveDrivers> activeDrivers)
{
availableDrivers = activeDrivers;
if (availableDrivers.Count > 0)
{
availableDrivers.ForEach(x => {
LatLng driverLocation = new LatLng(Convert.ToDouble(x.Latitude), Convert.ToDouble(x.Longitude));
LatLng pickUpLocation = new LatLng(Convert.ToDouble(rides.RidesInfo.LocationInfo.PickupLatitude), Convert.ToDouble(rides.RidesInfo.LocationInfo.PickupLongitude));
x.DistanceFromPickup = SphericalUtil.ComputeDistanceBetween(pickUpLocation, driverLocation);
});
availableDrivers = availableDrivers.OrderBy(o => o.DistanceFromPickup).ToList();
DriversFound?.Invoke(this, new DriverFoundEventArgs {
Drivers = availableDrivers, Ride = rides
});
}
else
{
DriverNotFound.Invoke(this, new EventArgs());
}
}