Refactor email template query to support multiple results

ReadEmailTemplateQuery now returns a collection of EmailTemplateDto, with optional filtering by Id, Type, and new LangCode property. Query handler updated to return all matching templates instead of a single result, and NotFoundException handling was removed.

EnvelopeGenerator.Application/EmailTemplates/Queries/ReadEmailTemplateQuery.cs

@@ -13,7 +13,7 @@ namespace EnvelopeGenerator.Application.EmailTemplates.Queries;
 /// Stellt eine Abfrage dar, um eine E-Mail-Vorlage zu lesen.
 /// Diese Klasse erbt von <see cref="IEmailTemplateQuery"/>.
 /// </summary>
-public record ReadEmailTemplateQuery : IEmailTemplateQuery, IRequest<EmailTemplateDto>
+public record ReadEmailTemplateQuery : IEmailTemplateQuery, IRequest<IEnumerable<EmailTemplateDto>>
 {
     /// <summary>
     /// Die eindeutige Kennung der E-Mail-Vorlage (optional).
@@ -34,12 +34,17 @@ public record ReadEmailTemplateQuery : IEmailTemplateQuery, IRequest<EmailTempla
     /// 9 - DocumentRejected_REC_2 (für sonstige Empfänger): Mail an andere Empfänger (Brief), wenn das Dokument abgelehnt wird.
     /// </summary>
     public EmailTemplateType? Type { get; set; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public string? LangCode { get; set; }
 }
 
 /// <summary>
 /// 
 /// </summary>
-public class ReadEmailTemplateQueryHandler : IRequestHandler<ReadEmailTemplateQuery, EmailTemplateDto>
+public class ReadEmailTemplateQueryHandler : IRequestHandler<ReadEmailTemplateQuery, IEnumerable<EmailTemplateDto>>
 {
     private readonly IMapper _mapper;
 
@@ -65,14 +70,21 @@ public class ReadEmailTemplateQueryHandler : IRequestHandler<ReadEmailTemplateQu
     /// <param name="cancel"></param>
     /// <returns></returns>
     /// <exception cref="InvalidOperationException"></exception>
-    public async Task<EmailTemplateDto> Handle(ReadEmailTemplateQuery request, CancellationToken cancel)
+    public async Task<IEnumerable<EmailTemplateDto>> Handle(ReadEmailTemplateQuery request, CancellationToken cancel)
     {
-        var query = request.Id is int id
-            ? _repo.Query.Where(temp => temp.Id == id)
-            : _repo.Query.Where(temp => temp.Name == request.Type!.ToString());
+        var query = _repo.Query;
 
-        var entity = await query.FirstOrDefaultAsync(cancel) ?? throw new NotFoundException();
+        if (request.Id is int id)
+            query = query.Where(temp => temp.Id == id);
 
-        return _mapper.Map<EmailTemplateDto>(entity);
+        if (request.Type is EmailTemplateType type)
+            query = query.Where(temp => temp.Name == type.ToString());
+
+        if (request.LangCode is string langCode)
+            query = query.Where(temp => temp.LangCode == langCode);
+
+        var entity = await query.ToListAsync(cancel);
+
+        return _mapper.Map<IEnumerable<EmailTemplateDto>>(entity);
     }
 }