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

namespace AutobusApi.Application.Cities.Queries.GetCity;

public class GetCityQueryHandler : IRequestHandler<GetCityQuery, CityDto>
{
    private readonly IApplicationDbContext _dbContext;
    private readonly IMapper _mapper;

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

    public async Task<CityDto> Handle(
        GetCityQuery request,
        CancellationToken cancellationToken)
    {
        var city = await _dbContext.Cities
            .SingleOrDefaultAsync(c => c.Id == request.Id);

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

        return _mapper.Map<CityDto>(city);
    }
}