EnvelopeGenerator/EnvelopeGenerator.Application/EmailTemplates/Queries/Read/ReadEmailTemplateQuery.cs

using AutoMapper;
using MediatR;
using EnvelopeGenerator.Application.Common.Interfaces.Repositories;
using EnvelopeGenerator.Domain.Constants;
using EnvelopeGenerator.Application.Common.Dto;

namespace EnvelopeGenerator.Application.EmailTemplates.Queries.Read;

/// <summary>
/// Stellt eine Abfrage dar, um eine E-Mail-Vorlage zu lesen.
/// Diese Klasse erbt von <see cref="EmailTemplateQuery"/>.
/// </summary>
public record ReadEmailTemplateQuery : EmailTemplateQuery, IRequest<EmailTemplateDto?>
{
}

/// <summary>
/// 
/// </summary>
public class ReadEmailTemplateQueryHandler : IRequestHandler<ReadEmailTemplateQuery, EmailTemplateDto?>
{
    private readonly IMapper _mapper;

    [Obsolete("Use Read-method returning IReadQuery<TEntity> instead.")]
    private readonly IEmailTemplateRepository _repository;

    /// <summary>
    /// Initialisiert eine neue Instanz der <see cref="EmailTemplateController"/>-Klasse.
    /// </summary>
    /// <param name="mapper">
    /// <param name="repository">
    /// Die AutoMapper-Instanz, die zum Zuordnen von Objekten verwendet wird.
    /// </param>
    [Obsolete("Use Read-method returning IReadQuery<TEntity> instead.")]
    public ReadEmailTemplateQueryHandler(IMapper mapper, IEmailTemplateRepository repository)
    {
        _mapper = mapper;
        _repository = repository;
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="request"></param>
    /// <param name="cancellationToken"></param>
    /// <returns></returns>
    /// <exception cref="InvalidOperationException"></exception>
    [Obsolete("Use IRepository")]
    public async Task<EmailTemplateDto?> Handle(ReadEmailTemplateQuery request, CancellationToken cancellationToken)
    {
        var temp = request.Id is int id
            ? await _repository.ReadByIdAsync(id)
            : request.Type is EmailTemplateType type
                ? await _repository.ReadByNameAsync(type)
                : throw new InvalidOperationException("Either a valid integer ID or a valid EmailTemplateType must be provided in the request.");

        return _mapper.Map<EmailTemplateDto>(temp);
    }
}