Fuel Log Match

Web/DAL/DataService.cs

@@ -99,6 +99,12 @@ namespace MileageTraker.Web.DAL
 				_db.Entry(nextLog).State = EntityState.Modified;
 			}
 
+			// remove the reference to the log from any fuellogs
+			foreach (var fuelLog in log.FuelLogs)
+			{
+				fuelLog.Log = null;
+			}
+
 			_db.Logs.Remove(log);
 			_db.SaveChanges();
 
@@ -409,6 +415,14 @@ namespace MileageTraker.Web.DAL
 			return _db.Vehicles.Find(id);
 		}
 
+		public string GetVehicleIdByTag(string tagNumber)
+		{
+			var vehicle = GetVehicleByTag(tagNumber);
+			if (vehicle != null)
+				return vehicle.VehicleId;
+			return null;
+		}
+
 		public Vehicle GetVehicleByTag(string tagNumber)
 		{
 			var vehicle = GetVehicles().FirstOrDefault(v => v.TagNumber == tagNumber);
@@ -672,13 +686,70 @@ namespace MileageTraker.Web.DAL
 				log.Date.Day == fuelLog.Date.Day
 				);
 			logs = logs.Where(log => log.GasPurchased == fuelLog.GasPurchased);
-
-			//logs = logs.Where(log => log.User.FullName == fuelLog.DriverFullName);
-			//logs = logs.Where(log => log.EndOdometer == fuelLog.Odometer);
-
+			
 			return logs.FirstOrDefault();
 		}
 
+		public IEnumerable<Log> GetPossibleMatchingLogs(FuelLog fuelLog)
+		{
+			const int dateRange = 3;
+			const double gasRange = 1;
+			const double odometerRange = 100;
+			var gasVehicleQuery = GetLogs();
+
+			// matching by Date, Gas Purchased (gallons), and Vehicle
+
+			var vehicle = GetVehicleByTag(fuelLog.TagNumber);
+			if (vehicle != null)
+				gasVehicleQuery = gasVehicleQuery.Where(log => log.VehicleId == vehicle.VehicleId);
+
+			var futureDate = fuelLog.Date.AddDays(dateRange);
+			var pastDate = fuelLog.Date.AddDays(-dateRange);
+
+			gasVehicleQuery = gasVehicleQuery.Where(log =>
+				log.Date.Year <= futureDate.Year &&
+				log.Date.Month <= futureDate.Month &&
+				log.Date.Day <= futureDate.Day &&
+				log.Date.Year >= pastDate.Year &&
+				log.Date.Month >= pastDate.Month &&
+				log.Date.Day >= pastDate.Day
+				);
+
+			var gasMax = fuelLog.GasPurchased + gasRange;
+			var gasMin = fuelLog.GasPurchased - gasRange;
+			gasVehicleQuery = gasVehicleQuery.Where(log => log.GasPurchased <= gasMax && log.GasPurchased >= gasMin);
+
+			var driverQuery =
+				GetLogs()
+				.Where(log => log.User.FullName.Contains(fuelLog.DriverFullName))
+				.Where(log => log.GasPurchased > 0)
+				.Where(log =>
+					log.Date.Year <= futureDate.Year &&
+					log.Date.Month <= futureDate.Month &&
+					log.Date.Day <= futureDate.Day &&
+					log.Date.Year >= pastDate.Year &&
+					log.Date.Month >= pastDate.Month &&
+					log.Date.Day >= pastDate.Day
+				);
+
+			var odoMax = fuelLog.Odometer + odometerRange;
+			var odoMin = fuelLog.Odometer - odometerRange;
+			var odometerQuery =
+				GetLogs()
+				.Where(log => log.EndOdometer > odoMin && log.EndOdometer < odoMax)
+				.Where(log => log.GasPurchased > 0)
+				.Where(log =>
+					log.Date.Year <= futureDate.Year &&
+					log.Date.Month <= futureDate.Month &&
+					log.Date.Day <= futureDate.Day &&
+					log.Date.Year >= pastDate.Year &&
+					log.Date.Month >= pastDate.Month &&
+					log.Date.Day >= pastDate.Day
+				);
+
+			return gasVehicleQuery.Union(driverQuery).Union(odometerQuery);
+		}
+
 		public IList<DateTime> GetValidFuelLogMonths()
 		{
 			var months =