Add location filtering based on ZIP + Country

database/mistox.sql

@@ -206,10 +206,7 @@ FIELDS TERMINATED BY '\t'
 ENCLOSED BY '"'
 LINES TERMINATED BY '\n';
 
-CREATE INDEX idx_country_code ON PostalCodes(CountryCode);
+CREATE INDEX idx_postal_country ON PostalCodes (City, PostalCode, CountryCode, Latitude, Longitude);
-CREATE INDEX idx_postal_code ON PostalCodes(PostalCode);
-CREATE INDEX idx_latitude ON PostalCodes(Latitude);
-CREATE INDEX idx_longitude ON PostalCodes(Longitude);
 
 -- Application Section
 

src/Server/Controllers/LocationController.cs

@@ -0,0 +1,28 @@
+using Microsoft.AspNetCore.Mvc;
+using BoredCareers.Services.DatabaseService;
+using BoredCareers.Entities;
+using BoredCareers.Services;
+
+namespace BoredCareers.Controllers {
+    [ApiController]
+    [Route("api/location")]
+    public class LocationController : MistoxControllerBase {
+
+        public LocationController(DatabaseService db, EmailService emailContext) : base(db) {}
+
+        [HttpGet]
+        public async Task<IActionResult> GetCompany(string PostalCode, string CountryCode, float MaxDistanceKm) {
+            if (isLoggedIn()) {
+
+                Location? MyZIP = await _databaseService.GetLocation(PostalCode, CountryCode);
+                if (MyZIP != null) {
+                    Location[] places = await _databaseService.GetNearbyLocations(MyZIP.Latitude, MyZIP.Longitude, MyZIP.CountryCode, MaxDistanceKm);
+                    return Ok(places.ToArray());
+                }
+                return NotFound("Postal + CountryCode not found");
+            }
+            return NotFound("Not logged in");
+        }
+
+    }
+}

src/Server/Entities/Location.cs

@@ -0,0 +1,10 @@
+namespace BoredCareers.Entities {
+    public class Location {
+        public string City { get; set; } = "";
+        public string PostalCode { get; set; } = "";
+        public string CountryCode { get; set; } = "";
+        public float Latitude { get; set; }
+        public float Longitude { get; set; }
+        public float DistanceKM { get; set; }
+    }
+}

src/Server/Services/DatabaseService/Location.cs

@@ -0,0 +1,95 @@
+using BoredCareers.Entities;
+using MySql.Data.MySqlClient;
+using System.Data;
+using System.Data.Common;
+using System.Text;
+
+namespace BoredCareers.Services.DatabaseService {
+    public partial class DatabaseService {
+
+        public async Task<Location?> GetLocation(string PostalCode, string CountryCode) {
+            using (MySqlConnection connection = GetConnection()) {
+                await connection.OpenAsync();
+                string command = @"
+                SELECT PostalCode, CountryCode, Latitude, Longitude, City
+                FROM PostalCodes
+                WHERE PostalCode = @PostalCode
+                AND CountryCode = @CountryCode;
+                ";
+
+                MySqlCommand cmd = new MySqlCommand(command, connection);
+                cmd.Parameters.AddWithValue("@PostalCode", PostalCode);
+                cmd.Parameters.AddWithValue("@CountryCode", CountryCode);
+
+                using (DbDataReader reader = await cmd.ExecuteReaderAsync()) {
+                    while (await reader.ReadAsync()) {
+                        string _city = reader.GetString("City");
+                        string _postalCode = reader.GetString("PostalCode");
+                        string _countryCode = reader.GetString("CountryCode");
+                        float _latitude = reader.GetFloat("Latitude");
+                        float _longitude = reader.GetFloat("Longitude");
+
+                        return new Location() {
+                            City = _city,
+                            PostalCode = _postalCode,
+                            CountryCode = _countryCode,
+                            Latitude = _latitude,
+                            Longitude = _longitude
+                        };
+                    }
+                }
+            }
+            return null;
+        }
+
+        public async Task<Location[]> GetNearbyLocations(float Latitude, float Longitude, string CountryCode, float MaxDistanceKm) {
+            List<Location> closePostalCodes = new List<Location>();
+            using (MySqlConnection connection = GetConnection()) {
+                await connection.OpenAsync();
+                string command = @"
+                SELECT PostalCode, CountryCode, Latitude, Longitude, City, (
+                    6371 * acos(
+                    cos(radians(@Latitude)) * 
+                    cos(radians(Latitude)) * 
+                    cos(radians(Longitude) - radians(@Longitude)) + 
+                    sin(radians(@Latitude)) * 
+                    sin(radians(Latitude))
+                    )
+                ) AS distance_km
+                FROM PostalCodes
+                WHERE countrycode = @CountryCode
+                HAVING distance_km <= @MaxDistanceKm
+                ORDER BY distance_km;
+                ";
+
+                MySqlCommand cmd = new MySqlCommand(command, connection);
+                cmd.Parameters.AddWithValue("@Latitude", Latitude);
+                cmd.Parameters.AddWithValue("@Longitude", Longitude);
+                cmd.Parameters.AddWithValue("@CountryCode", CountryCode);
+                cmd.Parameters.AddWithValue("@MaxDistanceKm", MaxDistanceKm);
+
+                using (DbDataReader reader = await cmd.ExecuteReaderAsync()) {
+                    while (await reader.ReadAsync()) {
+                        string _city = reader.GetString("City");
+                        string _postalCode = reader.GetString("PostalCode");
+                        string _countryCode = reader.GetString("CountryCode");
+                        float _latitude = reader.GetFloat("Latitude");
+                        float _longitude = reader.GetFloat("Longitude");
+                        float _distanceKm = reader.GetFloat("distance_km");
+
+                        closePostalCodes.Add(new Location() {
+                            City = _city,
+                            PostalCode = _postalCode,
+                            CountryCode = _countryCode,
+                            Latitude = _latitude,
+                            Longitude = _longitude,
+                            DistanceKM = _distanceKm
+                        });
+                    }
+                }
+            }
+            return closePostalCodes.ToArray();
+        }
+
+    }
+}