Visual fixes

Enums/PeriodType.cs

@@ -0,0 +1,38 @@
+namespace GazpromApp.Enums;
+
+public enum PeriodType
+{
+    Unknown = -1,
+    Day = 0,
+    Week = 1,
+    Month = 2,
+    Year = 3
+}
+
+public static class PeriodTypeExtensions
+{
+    public static string ToDescription(this PeriodType periodType)
+    {
+        return periodType switch
+        {
+            PeriodType.Day => "День",
+            PeriodType.Week => "Неделя",
+            PeriodType.Month => "Месяц",
+            PeriodType.Year => "Год",
+            PeriodType.Unknown => "Неизв.",
+            _ => string.Empty
+        };
+    }
+
+    public static PeriodType ToPeriodType(this string periodType)
+    {
+        return periodType switch
+        {
+            "День" => PeriodType.Day,
+            "Неделя" => PeriodType.Week,
+            "Месяц" => PeriodType.Month,
+            "Год" => PeriodType.Year,
+            _ => PeriodType.Unknown
+        };
+    }
+}