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

namespace AutobusApi.Application.Buses.Queries.GetBus;

public class GetBusQueryHandler : IRequestHandler<GetBusQuery, BusDto>
{
    private readonly IApplicationDbContext _dbContext;
    private readonly IMapper _mapper;

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

    public async Task<BusDto> Handle(
        GetBusQuery request,
        CancellationToken cancellationToken)
    {
        var bus = await _dbContext.Buses
            .ProjectTo<BusDto>(_mapper.ConfigurationProvider)
            .SingleOrDefaultAsync(c => c.Id == request.Id);

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

        return bus;
    }
}