ChartWindow: Added second graph for gebunden

Elwig/Helpers/Billing/ContractSelection.cs

@@ -0,0 +1,47 @@
+using Elwig.Models.Entities;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Elwig.Helpers.Billing {
+    public class ContractSelection : IComparable<ContractSelection> {
+
+        public WineVar? Variety { get; }
+        public WineAttr? Attribute { get; }
+        public string Listing => Variety != null || Attribute != null ? $"{Variety?.SortId}{Attribute?.AttrId}" : "";
+
+        public ContractSelection(WineVar? var, WineAttr? attr) {
+            Variety = var;
+            Attribute = attr;
+        }
+
+        public ContractSelection(WineVar var) {
+            Variety = var;
+        }
+
+        public ContractSelection(WineAttr attr) {
+            Attribute = attr;
+        }
+
+        public override string ToString() {
+            return (Variety != null ? $"{Variety.Name}" : "") + (Attribute != null ? $" {Attribute.Name}" : "");
+        }
+
+        public static List<ContractSelection> GetContractsForYear(AppDbContext context, int year) {
+            return context.DeliveryParts
+                .Where(d => d.Year == year)
+                .Select(d => new ContractSelection(d.Variant, d.Attribute))
+                .Distinct()
+                .ToList()
+                .Union(context.WineVarieties.Select(v => new ContractSelection(v)))
+                .ToList();
+        }
+
+        public int CompareTo(ContractSelection? other) {
+            //MessageBox.Show($"{Listing} -- {other.Listing} : {Listing.CompareTo(other.Listing)}");
+            return other != null ?
+                Listing.CompareTo(other.Listing) :
+                throw new ArgumentException();
+        } 
+    }
+}