using AutobusApi.Application.Common.Exceptions;
using AutobusApi.Application.Common.Interfaces;
using AutoMapper;
using AutoMapper.QueryableExtensions;
using MediatR;
using Microsoft.EntityFrameworkCore;

namespace AutobusApi.Application.Countries.Queries.GetCountry;

public class GetCountryQueryHandler : IRequestHandler<GetCountryQuery, CountryDto>
{
    private readonly IApplicationDbContext _dbContext;
    private readonly IMapper _mapper;

    public GetCountryQueryHandler(
        IApplicationDbContext dbContext,
        IMapper mapper)
    {
        _dbContext = dbContext;
        _mapper = mapper;
    }

    public async Task<CountryDto> Handle(
        GetCountryQuery request,
        CancellationToken cancellationToken)
    {
        var country = await _dbContext.Countries
            .ProjectTo<CountryDto>(_mapper.ConfigurationProvider)
            .SingleOrDefaultAsync(c => c.Id == request.Id);

        if (country == null)
        {
            throw new NotFoundException();
        }

        return country;
    }
}