Refactor UpdateEmailTemplateCommand and handler

- Introduce EmailTemplateUpdateDto for update payloads.
- Expose Id and Type directly on UpdateEmailTemplateCommand; remove EmailTemplateQuery property.
- Add QueryExpression for flexible template selection by Id or Type.
- Remove AutoMapper and EmailTemplateDto usage from handler; update repository call to use EmailTemplateUpdateDto.
- Update MappingProfile to map EmailTemplateUpdateDto to EmailTemplate and set ChangedWhen to DateTime.UtcNow.
- Remove obsolete code and improve documentation.

EnvelopeGenerator.Application/EmailTemplates/Commands/UpdateEmailTemplateCommand.cs

@@ -1,37 +1,56 @@
 using AutoMapper;
 using DigitalData.Core.Abstraction.Application.Repository;
 using DigitalData.Core.Exceptions;
-using MediatR;
-using System.Text.Json.Serialization;
-using EnvelopeGenerator.Domain.Entities;
-using Microsoft.EntityFrameworkCore;
 using EnvelopeGenerator.Domain.Constants;
-using EnvelopeGenerator.Application.Common.Dto;
+using EnvelopeGenerator.Domain.Entities;
+using MediatR;
+using System.Linq.Expressions;
 
-namespace EnvelopeGenerator.Application.EmailTemplates.Commands.Update;
+namespace EnvelopeGenerator.Application.EmailTemplates.Commands;
+
+/// <summary>
+/// 
+/// </summary>
+/// <param name="Body"></param>
+/// <param name="Subject"></param>
+public record EmailTemplateUpdateDto(string Body, string Subject);
 
 /// <summary>
 /// Befehl zum Aktualisieren einer E-Mail-Vorlage.
 /// </summary>
-/// <param name="Body">
-/// (Optional)Der neue Inhalt des E-Mail-Textkörpers. Wenn null, bleibt der vorhandene Inhalt unverändert.
-/// </param>
-/// <param name="Subject">
-/// (Optional) Der neue Betreff der E-Mail. Wenn null, bleibt der vorhandene Betreff unverändert.
-/// </param>
-public record UpdateEmailTemplateCommand(string? Body = null, string? Subject = null) : IRequest
+public record UpdateEmailTemplateCommand : IEmailTemplateQuery, IRequest
 {
-    /// <param>
-    /// Die Abfrage, die die E-Mail-Vorlage darstellt, die aktualisiert werden soll.
-    /// </param>
-    [JsonIgnore]
-    public IEmailTemplateQuery? EmailTemplateQuery { get; set; }
+    /// <summary>
+    /// Die eindeutige Kennung der E-Mail-Vorlage (optional).
+    /// </summary>
+    public int? Id { get; set; }
+
+    /// <summary>
+    /// Der Typ der E-Mail-Vorlage, z. B. <see cref="EmailTemplateType"/> (optional). Beispiele:<br/>
+    /// 0 - DocumentReceived: Benachrichtigung über den Empfang eines Dokuments.<br/>
+    /// 1 - DocumentSigned: Benachrichtigung über die Unterzeichnung eines Dokuments.<br/>
+    /// 2 - DocumentDeleted: Benachrichtigung über das Löschen eines Dokuments.<br/>
+    /// 3 - DocumentCompleted: Benachrichtigung über den Abschluss eines Dokuments.<br/>
+    /// 4 - DocumentAccessCodeReceived: Benachrichtigung über den Erhalt eines Zugangscodes.<br/>
+    /// 5 - DocumentShared: Benachrichtigung über das Teilen eines Dokuments.<br/>
+    /// 6 - TotpSecret: Benachrichtigung über ein TOTP-Geheimnis.<br/>
+    /// 7 - DocumentRejected_ADM (für den Absender): Mail an den Absender, wenn das Dokument abgelehnt wird.<br/>
+    /// 8 - DocumentRejected_REC (für den ablehnenden Empfänger): Mail an den ablehnenden Empfänger, wenn das Dokument abgelehnt wird.<br/>
+    /// 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>
-    [JsonIgnore]
-    public DateTime ChangedWhen { get; init; } = DateTime.Now;
+    public Expression<Func<EmailTemplate, bool>> QueryExpression => Id is int id
+            ? temp => temp.Id == id
+            : temp => temp!.Name == Type.ToString();
+
+    /// <summary>
+    /// Die aktualisierte E-Mail-Vorlage.
+    /// </summary>
+    public EmailTemplateUpdateDto Update { get; init; } = null!;
 }
 
 /// <summary>
@@ -41,17 +60,13 @@ public class UpdateEmailTemplateCommandHandler : IRequestHandler<UpdateEmailTemp
 {
     private readonly IRepository<EmailTemplate> _repository;
 
-    private readonly IMapper _mapper;
-
     /// <summary>
     /// 
     /// </summary>
     /// <param name="repository"></param>
-    /// <param name="mapper"></param>
-    public UpdateEmailTemplateCommandHandler(IRepository<EmailTemplate> repository, IMapper mapper)
+    public UpdateEmailTemplateCommandHandler(IRepository<EmailTemplate> repository)
     {
         _repository = repository;
-        _mapper = mapper;
     }
 
     /// <summary>
@@ -62,31 +77,6 @@ public class UpdateEmailTemplateCommandHandler : IRequestHandler<UpdateEmailTemp
     /// <returns></returns>
     /// <exception cref="InvalidOperationException"></exception>
     /// <exception cref="NotFoundException"></exception>
-    [Obsolete("Use Read-method returning IReadQuery<TEntity> instead.")]
-    public async Task Handle(UpdateEmailTemplateCommand request, CancellationToken cancel)
-    {
-        EmailTemplateDto? tempDto;
-
-        if (request.EmailTemplateQuery?.Id is int id)
-        {
-            var temp = await _repository.ReadOnly().Where(t => t.Id == id).FirstOrDefaultAsync(cancel);
-            tempDto = _mapper.Map<EmailTemplateDto>(temp);
-        }
-        else if (request!.EmailTemplateQuery!.Type is EmailTemplateType type)
-        {
-            var temp = await _repository.ReadOnly().Where(t => t.Name == type.ToString()).FirstOrDefaultAsync(cancel);
-            tempDto = _mapper.Map<EmailTemplateDto>(temp);
-        }
-        else
-        {
-            throw new InvalidOperationException("Both id and type is null. Id: " + request.EmailTemplateQuery.Id + ". Type: " + request.EmailTemplateQuery.Type.ToString());
-        }
-
-        if (tempDto == null)
-        {
-            throw new NotFoundException();
-        }
-
-        await _repository.UpdateAsync(tempDto, t => t.Id == tempDto.Id, cancel);
-    }
+    public Task Handle(UpdateEmailTemplateCommand request, CancellationToken cancel)
+        => _repository.UpdateAsync(request.Update, request.QueryExpression, cancel);
 }

EnvelopeGenerator.Application/EmailTemplates/MappingProfile.cs

@@ -17,8 +17,7 @@ public class MappingProfile : Profile
     {
         CreateMap<EmailTemplate, EmailTemplateDto>();
 
-        CreateMap<UpdateEmailTemplateCommand, EmailTemplate>()
-            .ForMember(dest => dest.Id, opt => opt.Ignore())
-            .ForMember(dest => dest.ChangedWhen, opt => opt.MapFrom(_ => DateTime.Now));
+        CreateMap<EmailTemplateUpdateDto, EmailTemplate>()
+            .ForMember(dest => dest.ChangedWhen, opt => opt.MapFrom(_ => DateTime.UtcNow));
     }
 }