using AutoMapper;
using EnvelopeGenerator.Application.Common.Dto;
using EnvelopeGenerator.Application.Common.Query;
using EnvelopeGenerator.Domain.Entities;
using MediatR;
using EnvelopeGenerator.Application.Common.Extensions;
using DigitalData.Core.Abstraction.Application.Repository;
using Microsoft.EntityFrameworkCore;

namespace EnvelopeGenerator.Application.DocReceiverElements.Queries;

/// <summary>
/// 
/// </summary>
public record ReadDocReceiverElementQuery : EnvelopeReceiverQueryBase, IRequest<IEnumerable<DocReceiverElementDto>>
{
}

/// <summary>
/// 
/// </summary>
public class ReadDocReceiverElementQueryHandler : IRequestHandler<ReadDocReceiverElementQuery, IEnumerable<DocReceiverElementDto>>
{
    private readonly IRepository<DocReceiverElement> _repository;

    private readonly IMapper _mapper;

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

    /// <summary>
    /// 
    /// </summary>
    /// <param name="request"></param>
    /// <param name="cancellationToken"></param>
    /// <returns></returns>
    /// <exception cref="NotImplementedException"></exception>
    public async Task<IEnumerable<DocReceiverElementDto>> Handle(ReadDocReceiverElementQuery request, CancellationToken cancellationToken)
    {
        var q = _repository.Query;

        if(request.Envelope.Id is int envelopeId)
            q = q.Where(e => e.Document.EnvelopeId == envelopeId);

        if (request.Envelope.Uuid is string envelopeUuid)
            q = q.Where(e => e.Document.Envelope.Uuid == envelopeUuid);

        if (request.Receiver.Id is int receiverId)
            q = q.Where(e => e.ReceiverId == receiverId);

        if (request.Receiver.Signature is string signature)
            q = q.Where(e => e.Receiver.Signature == signature);

        var elements = await q.ToListAsync(cancellationToken);

        return _mapper.Map<IEnumerable<DocReceiverElementDto>>(elements);
    }
}