feat(import): resolve color variety ID mappings mismatch, support unnamed parents in virtual litters, and implement SaleContract updates

GerbilManagerWebAPI/Endpoints/ContractEndpoints.cs

@@ -23,6 +23,7 @@ namespace GerbilManagerWebAPI.Endpoints
     {
         private const string DocxContentType =
             "application/vnd.openxmlformats-officedocument.wordprocessingml.document";
+        private const string PdfContentType = "application/pdf";
 
         public static IEndpointRouteBuilder MapContractEndpoints(this IEndpointRouteBuilder app)
         {
@@ -50,6 +51,7 @@ namespace GerbilManagerWebAPI.Endpoints
                 var errors = new Dictionary<string, string[]>();
 
                 var gerbilIds = (input.GerbilIds ?? []).Distinct().ToList();
+                var photoChoice = input.AnimalPhotos ?? [];
                 if (gerbilIds.Count == 0)
                     errors["gerbilIds"] = ["Mindestens ein Tier auswählen."];
                 if (input.Price < 0)
@@ -100,7 +102,11 @@ namespace GerbilManagerWebAPI.Endpoints
                     ContractDate = contractDate,
                     FileName = fileName,
                     CreatedAt = DateTimeOffset.UtcNow,
-                    Animals = gerbilIds.Select(id => new SaleContractAnimal { GerbilId = id }).ToList(),
+                    Animals = gerbilIds.Select(id => new SaleContractAnimal
+                    {
+                        GerbilId = id,
+                        PhotoId = photoChoice.TryGetValue(id, out var pid) ? pid : null,
+                    }).ToList(),
                 };
                 db.SaleContracts.Add(entity);
 
@@ -144,6 +150,49 @@ namespace GerbilManagerWebAPI.Endpoints
                 return TypedResults.PhysicalFile(path, DocxContentType, download);
             });
 
+            // GET /contracts/{id}/pdf — druckfertiges PDF, aus den (aktuellen) Daten regeneriert.
+            group.MapGet("/{id:guid}/pdf", async Task<Results<FileContentHttpResult, NotFound>> (
+                Guid id, ApplicationContext db, IConfiguration config, IWebHostEnvironment env) =>
+            {
+                var c = await db.SaleContracts.AsNoTracking()
+                    .Include(x => x.Contact)
+                    .Include(x => x.Animals)
+                    .FirstOrDefaultAsync(x => x.Id == id);
+                if (c is null || c.Contact is null) return TypedResults.NotFound();
+
+                var gerbilIds = c.Animals.Select(a => a.GerbilId).ToList();
+                var gerbils = await db.Gerbils.AsNoTracking()
+                    .Include(g => g.ColorVariety)
+                    .Where(g => gerbilIds.Contains(g.Id))
+                    .ToListAsync();
+                var settings = await db.BreederSettings.AsNoTracking()
+                    .FirstOrDefaultAsync(s => s.Id == BreederSettings.SingletonId)
+                    ?? new BreederSettings();
+
+                // Gewählte Vertragsfotos nachladen (Foto muss zum Tier gehören und die Datei
+                // existieren — sonst bleibt das Bild leer statt zu scheitern).
+                var photoByGerbil = c.Animals
+                    .Where(a => a.PhotoId is not null)
+                    .ToDictionary(a => a.GerbilId, a => a.PhotoId!.Value);
+                var photoBytes = await LoadAnimalPhotos(db, photoByGerbil, PhotoRoot(config, env));
+
+                var data = new ContractData(
+                    Seller: ToSeller(settings),
+                    Buyer: new ContractBuyer(c.Contact.Name, c.Contact.Address ?? "", c.Contact.Phone, c.Contact.Email),
+                    Animals: gerbils
+                        .Select(g => new ContractAnimal(
+                            g.Name, GeschlechtText(g.Gender), g.DateOfBirth, g.ColorVariety?.Name,
+                            photoBytes.GetValueOrDefault(g.Id)))
+                        .ToList(),
+                    Price: c.Price,
+                    HandoverDate: c.HandoverDate,
+                    ContractDate: c.ContractDate);
+
+                var pdf = ContractPdfGenerator.Generate(data);
+                var download = $"Abgabevertrag_{c.ContractDate:yyyy-MM-dd}_{Sanitize(c.Contact.Name)}.pdf";
+                return TypedResults.File(pdf, PdfContentType, download);
+            });
+
             // DELETE /contracts/{id} — Zeile + Datei; Tier-Status wird NICHT zurückgedreht
             // (das wäre Magie — Status korrigiert man am Tier selbst).
             group.MapDelete("/{id:guid}", async Task<Results<NoContent, NotFound>> (
@@ -166,6 +215,34 @@ namespace GerbilManagerWebAPI.Endpoints
         private static string ContractRoot(IConfiguration config, IWebHostEnvironment env) =>
             config["Contracts:RootPath"] ?? Path.Combine(env.ContentRootPath, "contract-storage");
 
+        /// <summary>Foto-Dateiroot (geteilt mit den Foto-Endpoints).</summary>
+        private static string PhotoRoot(IConfiguration config, IWebHostEnvironment env) =>
+            config["Photos:RootPath"] ?? Path.Combine(env.ContentRootPath, "photo-storage");
+
+        /// <summary>Lädt die gewählten Vertragsfotos als Rohbytes (GerbilId -> Bytes).
+        /// Überspringt Fotos, die nicht zum Tier gehören oder deren Datei fehlt.</summary>
+        private static async Task<Dictionary<Guid, byte[]>> LoadAnimalPhotos(
+            ApplicationContext db, Dictionary<Guid, Guid> photoByGerbil, string photoRoot)
+        {
+            var result = new Dictionary<Guid, byte[]>();
+            if (photoByGerbil.Count == 0) return result;
+
+            var photoIds = photoByGerbil.Values.ToList();
+            var photos = await db.GerbilPhotos.AsNoTracking()
+                .Where(p => photoIds.Contains(p.Id))
+                .ToListAsync();
+
+            foreach (var (gerbilId, photoId) in photoByGerbil)
+            {
+                var photo = photos.FirstOrDefault(p => p.Id == photoId && p.GerbilId == gerbilId);
+                if (photo is null) continue;
+                var path = Path.Combine(photoRoot, photo.FileName);
+                if (File.Exists(path))
+                    result[gerbilId] = await File.ReadAllBytesAsync(path);
+            }
+            return result;
+        }
+
         private static BreederProfile ToSeller(BreederSettings s) => new()
         {
             ZuchtName = s.ZuchtName,