public static Pharmacy FillPharmacy(string csvLine)
{
string[] values = csvLine.Split(',');
Pharmacy pharmacy = new Pharmacy();
if (values[4] == "\"zip\"")
{
return(null);
}
pharmacy.Name = values[0];
pharmacy.Address = values[1];
pharmacy.City = values[2];
pharmacy.State = values[3];
pharmacy.Zipcode = Convert.ToInt32(values[4]);
pharmacy.Latitude = Convert.ToDouble(values[5]);
pharmacy.Longitude = Convert.ToDouble(values[6]);
pharmacy.Location = new GeoCoordinate(pharmacy.Latitude, pharmacy.Longitude);
return(pharmacy);
}
public Pharmacy GetNearestPharmacy(double lat, double lon)
{
//Import CSV - This can be stored in Database as well
List <Pharmacy> pharmacies = new List <Pharmacy>();
string path = @"C:\Users\harshul\source\repos\PharmacyLocator\PharmacyLocator\pharmacies.csv";
using (var reader = new StreamReader(path))
{
while (!reader.EndOfStream)
{
var line = reader.ReadLine();
Pharmacy pharmacy = Pharmacy.FillPharmacy(line);
if (pharmacy != null)
{
pharmacies.Add(pharmacy);
}
}
}
//Import CSV COMPLETE
var MaxLat = lat + 0.5; //Each degree of Latitude is approximately 69 miles
var MinLat = lat - 0.5; //Each degree of Longitude = cosine (latitude in decimal degrees) * length of degree (miles) at equator
var MaxLon = lon + 0.5; //Latitude can be obtained from above, Length of degree at equator - 69.172 miles
var MinLon = lon - 0.5; //Degree of Longitude at 39 Degrees Latitude is around 53.43 miles
//Since Min and Max Latitude in give dataset is 38.88323 & 39.24578, I added only 0.5 to form radius
//Same for longitude as well, Min and Max longitude is -95.77866 & -94.25503
//Checking for pharmacies within radius of given lat + 0.5, lon + 0.5, which is basically (lat+0.5)^2 + (lon+0.5)^2)
List <Pharmacy> pharmaciesNearUser = pharmacies.FindAll(u => u.Latitude <MaxLat && u.Latitude> MinLat && u.Longitude <MaxLon && u.Longitude> MinLon);
List <Pharmacy> pharmaciesToCheck = pharmacies;
//if there are pharmacies in our radius then check the distance between user and only those pharmacies, else check distance with all the pharmacies
if (pharmaciesNearUser.Count > 0)
{
pharmaciesToCheck = pharmaciesNearUser;
}
//Initiate variables for checking
double distance;
int count = 0;
Pharmacy nearestPharmacy = new Pharmacy();
GeoCoordinate userLocation = new GeoCoordinate(lat, lon);
//Start the checking process
foreach (var pharmacy in pharmaciesToCheck)
{
//GetDistanceTo is a C# Method that is available to check the distance between two co-ordinates
//GetDistanceTo provides the value in meters, so we are multiplying with the below number to convert into miles
distance = (userLocation.GetDistanceTo(pharmacy.Location)) * 0.000621371192;
if (count == 0)
{
nearestPharmacy.Name = pharmacy.Name;
nearestPharmacy.Address = pharmacy.Address;
nearestPharmacy.City = pharmacy.City;
nearestPharmacy.State = pharmacy.State;
nearestPharmacy.Zipcode = pharmacy.Zipcode;
nearestPharmacy.Distance = distance;
}
//if distance is less then Nearest Pharmacy, then Update the nearestPharmacy
if (nearestPharmacy.Distance > distance)
{
nearestPharmacy.Name = pharmacy.Name;
nearestPharmacy.Address = pharmacy.Address;
nearestPharmacy.City = pharmacy.City;
nearestPharmacy.State = pharmacy.State;
nearestPharmacy.Zipcode = pharmacy.Zipcode;
nearestPharmacy.Distance = distance;
}
//The counter can be incremented or set to any number other then 0, Since we only require it for 1st
//I have set it to increment because, if in future we try to expand the function then It might be useful (Left it more open-ended)
count++;
}
//Return the nearestPharmacyDetails
return(nearestPharmacy);
}
