using AutoMapper;
using EnvelopeGenerator.Application.Contracts.Repositories;
using EnvelopeGenerator.Application.Exceptions;
using MediatR;

namespace EnvelopeGenerator.Application.Histories.Queries.Read;

/// <summary>
/// 
/// </summary>
public class ReadHistoryQueryHandler : IRequestHandler<ReadHistoryQuery, IEnumerable<ReadHistoryResponse>>
{
    private readonly IEnvelopeHistoryRepository _repository;

    private readonly IMapper _mapper;

    /// <summary>
    /// 
    /// </summary>
    /// <param name="repository"></param>
    /// <param name="mapper"></param>
    public ReadHistoryQueryHandler(IEnvelopeHistoryRepository repository, IMapper mapper)
    {
        _repository = repository;
        _mapper = mapper;
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="request"></param>
    /// <param name="cancellationToken"></param>
    /// <returns></returns>
    /// <exception cref="NotFoundException"></exception>
    public async Task<IEnumerable<ReadHistoryResponse>> Handle(ReadHistoryQuery request, CancellationToken cancellationToken)
    {
        var hists = await _repository.ReadAsync(request.EnvelopeId, status: request.Status is null ? null : (int) request.Status);

        if (!hists.Any())
            throw new NotFoundException();
                
        return _mapper.Map<IEnumerable<ReadHistoryResponse>>(hists);
    }
}