MemberAdminWindow: Add feature to export .vcf files

Elwig/Helpers/Export/VCard.cs

@@ -0,0 +1,65 @@
+using Elwig.Models.Entities;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Elwig.Helpers.Export {
+    public class VCard : IExporter<Member> {
+
+        public static string FileExtension => "vcf";
+
+        private readonly StreamWriter _writer;
+
+        public VCard(string filename) : this(filename, Utils.UTF8) { }
+
+        public VCard(string filename, Encoding encoding) {
+            _writer = new StreamWriter(filename, false, encoding);
+        }
+
+        public void Dispose() {
+            GC.SuppressFinalize(this);
+            _writer.Dispose();
+        }
+
+        public ValueTask DisposeAsync() {
+            GC.SuppressFinalize(this);
+            return _writer.DisposeAsync();
+        }
+
+        public async Task ExportAsync(IEnumerable<Member> data, IProgress<double>? progress = null) {
+            progress?.Report(0.0);
+            int count = data.Count() + 1, i = 0;
+
+            foreach (var row in data) {
+                var billingAddr = row.BillingAddress != null ? $"ADR;TYPE=work;LANGUAGE=de;LABEL=\"{row.BillingAddress.FullName}\\n{row.BillingAddress.Address}\\n{row.BillingAddress.PostalDest.AtPlz?.Plz} {row.BillingAddress.PostalDest.AtPlz?.Ort.Name}\\nÖsterreich\":;;{row.BillingAddress.Address};{row.BillingAddress.PostalDest.AtPlz?.Ort.Name};;{row.BillingAddress.PostalDest.AtPlz?.Plz};Österreich\r\n" : null;
+                var tel = string.Join("", row.TelephoneNumbers
+                    .Where(n => n.Type != "fax")
+                    .Select(n => $"TEL;TYPE={(n.Type == "mobile" ? "cell" : "voice")}:{n.Number}\r\n"));
+                var email = string.Join("", row.EmailAddresses.Select(a => $"EMAIL:{a.Address}\r\n"));
+                await _writer.WriteLineAsync($"""
+                    BEGIN:VCARD
+                    VERSION:4.0
+                    UID:mg{row.MgNr}@{App.Client.NameToken.ToLower()}.elwig.at
+                    NOTE:MgNr. {row.MgNr}
+                    FN:{row.AdministrativeName}
+                    N:{row.Name};{row.GivenName};{row.MiddleName};{row.Prefix};{row.Suffix}
+                    KIND:{(row.IsJuridicalPerson ? "org" : "individual")}
+                    ADR{(billingAddr == null ? "" : ";TYPE=home")};LANGUAGE=de;LABEL="{row.Address}\n{row.PostalDest.AtPlz?.Plz} {row.PostalDest.AtPlz?.Ort.Name}\nÖsterreich":;;{row.Address};{row.PostalDest.AtPlz?.Ort.Name};;{row.PostalDest.AtPlz?.Plz};Österreich
+                    {billingAddr}{tel}{email}REV:{row.ModifiedAt.ToUniversalTime():yyyyMMdd\THHmmss\Z}
+                    END:VCARD
+                    """);
+                progress?.Report(100.0 * ++i / count);
+            }
+
+            await _writer.FlushAsync();
+            progress?.Report(100.0);
+        }
+
+        public void Export(IEnumerable<Member> data, IProgress<double>? progress = null) {
+            ExportAsync(data, progress).GetAwaiter().GetResult();
+        }
+    }
+}

Elwig/Helpers/ExportMode.cs

@@ -1,5 +1,5 @@
 namespace Elwig.Helpers {
     public enum ExportMode {
-        Show, SaveList, SavePdf, Print, Email, Export, Upload
+        Show, SaveList, SavePdf, Print, Email, Vcf, Export, Upload
     }
 }