[#73] DeliveryAdminWindow: Add Liefermengen Excel output

Elwig/Models/Dtos/MemberDeliveryData.cs

@@ -0,0 +1,59 @@
+using Elwig.Models.Entities;
+using Microsoft.EntityFrameworkCore;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Elwig.Models.Dtos {
+    public class MemberDeliveryData : DataTable<MemberDeliveryRow> {
+
+        private static readonly (string, string, string?, int?)[] FieldNames = [
+          ("MgNr", "MgNr.", null, 12),
+            ("Name1", "Name", null, 40),
+            ("Name2", "Vorname", null, 40),
+            ("Address", "Adresse", null, 60),
+            ("Plz", "PLZ", null, 10),
+            ("Locality", "Ort", null, 60),
+            ("Weight", "Geliefert", "kg", 22),
+        ];
+
+        public MemberDeliveryData(IEnumerable<MemberDeliveryRow> rows, List<string> filterNames) :
+            base("Liefermengen Gesamt", "Liefermengen pro Mitglied", string.Join(" / ", filterNames), rows, FieldNames) {
+        }
+
+        public static async Task<MemberDeliveryData> FromQuery(IQueryable<DeliveryPart> query, List<string> filterNames) {
+            return new((await query
+                .GroupBy(p => new {
+                    p.Delivery.MgNr,
+                    p.Delivery.Member.Name,
+                    p.Delivery.Member.GivenName,
+                    p.Delivery.Member.Address,
+                    p.Delivery.Member.PostalDest.AtPlz!.Plz,
+                    Ort = p.Delivery.Member.PostalDest.AtPlz!.Ort.Name,
+                })
+                .Select(g => new {
+                    g.Key,
+                    Weight = g.Sum(p => p.Weight),
+                }).ToListAsync())
+                .Select(g => new MemberDeliveryRow {
+                    MgNr = g.Key.MgNr,
+                    Name1 = g.Key.Name,
+                    Name2 = g.Key.GivenName,
+                    Address = g.Key.Address,
+                    Plz = g.Key.Plz,
+                    Locality = g.Key.Ort,
+                    Weight = g.Weight,
+                }), filterNames);
+        }
+    }
+
+    public class MemberDeliveryRow {
+        public required int MgNr;
+        public required string Name1;
+        public required string? Name2;
+        public required string Address;
+        public required int Plz;
+        public required string Locality;
+        public required int Weight;
+    }
+}