Filter vehicle services

Web/ViewModels/DateQueryViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace MileageTraker.Web.ViewModels
+{
+	public class DateQueryViewModel
+	{
+		public int? Year { get; set; }
+		public int? Month { get; set; }
+		public int? MonthRange { get; set; }
+
+		public string YearMonthStart
+		{
+			get { return string.Format("{0}-{1:00}", Year, Month); }
+		}
+
+		public string YearMonthEnd
+		{
+			get
+			{
+				var dateTime = new DateTime(Year.Value, Month.Value, 1);
+				var time = dateTime.AddMonths(MonthRange.Value - 1);
+				return string.Format("{0}-{1:00}", time.Year, time.Month);
+			}
+		}
+
+		public override string ToString()
+		{
+			var v = new List<string>();
+
+			if (Year.HasValue && Month.HasValue)
+			{
+				var str = YearMonthStart;
+
+				if (MonthRange.HasValue && MonthRange > 1)
+					str += "to" + YearMonthEnd;
+
+				v.Add(str);
+			}
+			
+			return String.Join("_", v).Replace(' ', '-');
+		}
+
+		public virtual bool HasParameters()
+		{
+			return Year.HasValue;
+		}
+
+		/// <summary>
+		/// Use the given list of valid dates, set the default options
+		/// </summary>
+		/// <param name="validYearMonths"></param>
+		public virtual void SetDefaultParameters(IList<DateTime> validYearMonths)
+		{
+			if (!HasParameters())
+			{
+				Year = validYearMonths.First().Year;
+				Month = validYearMonths.First().Month;
+				MonthRange = 1;
+			}
+			if (Year.HasValue && !Month.HasValue)
+			{
+				var validLogMonths = validYearMonths.Where(dt => dt.Year == Year).ToList();
+				Month = validLogMonths.Min(dt => dt.Month);
+				MonthRange = validLogMonths.Max(dt => dt.Month) - Month + 1;
+			}
+		}
+	}
+}