Add project files.

DXApp.TemplateKitProject/Services/ZugferdImportService.cs

@@ -0,0 +1,30 @@
+using DXApp.TemplateKitProject.Data;
+using DXApp.TemplateKitProject.Models;
+
+namespace DXApp.TemplateKitProject.Services;
+
+public class ZugferdImportService(
+    ZugferdExtractorService extractor,
+    ZugferdParserService parser,
+    AppDbContext db,
+    ILogger<ZugferdImportService> logger)
+{
+    public async Task<ZugferdInvoice?> ImportAsync(Stream pdfStream, string sourceType)
+    {
+        var xml = extractor.ExtractXml(pdfStream);
+
+        if (xml is null)
+        {
+            logger.LogWarning("Kein ZUGFeRD-XML in der PDF-Datei gefunden.");
+            return null;
+        }
+
+        var invoice = parser.Parse(xml);
+        invoice.SourceType = sourceType;
+
+        db.ZugferdInvoices.Add(invoice);
+        await db.SaveChangesAsync();
+
+        return invoice;
+    }
+}