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

namespace AutobusApi.Application.Regions.Queries.GetRegion;

public class GetRegionQueryHandler : IRequestHandler<GetRegionQuery, RegionDto>
{
    private readonly IApplicationDbContext _dbContext;
    private readonly IMapper _mapper;

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

    public async Task<RegionDto> Handle(
        GetRegionQuery request,
        CancellationToken cancellationToken)
    {
        var region = await _dbContext.Regions
            .SingleOrDefaultAsync(c => c.Id == request.Id);

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

        return _mapper.Map<RegionDto>(region);
    }
}