using AutoMapper;
using DigitalData.Core.Abstraction.Application.Repository;
using DigitalData.Core.Exceptions;
using EnvelopeGenerator.Application.Dto.EnvelopeHistory;
using EnvelopeGenerator.Domain.Entities;
using MediatR;
using Microsoft.EntityFrameworkCore;

namespace EnvelopeGenerator.Application.Histories.Queries;

/// <summary>
/// 
/// </summary>
public class ReadHistoryQueryHandler : IRequestHandler<ReadHistoryQuery, IEnumerable<EnvelopeHistoryDto>>
{
    private readonly IRepository<EnvelopeHistory> _repo;

    private readonly IMapper _mapper;

    /// <summary>
    /// 
    /// </summary>
    /// <param name="repo"></param>
    /// <param name="mapper"></param>
    public ReadHistoryQueryHandler(IRepository<EnvelopeHistory> repo, IMapper mapper)
    {
        _repo = repo;
        _mapper = mapper;
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="request"></param>
    /// <param name="cancel"></param>
    /// <returns></returns>
    /// <exception cref="NotFoundException"></exception>
    public async Task<IEnumerable<EnvelopeHistoryDto>> Handle(ReadHistoryQuery request, CancellationToken cancel = default)
    {
        var query = _repo.ReadOnly().Where(h => h.EnvelopeId == request.EnvelopeId);
        if (request.Status is not null)
            query = query.Where(h => h.Status == request.Status);

        var hists = await query.ToListAsync(cancel);
        return _mapper.Map<IEnumerable<EnvelopeHistoryDto>>(hists);
    }
}