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

namespace AutobusApi.Application.Cities.Commands.DeleteCity;

public class DeleteCityCommandHandler : IRequestHandler<DeleteCityCommand>
{
    private readonly IApplicationDbContext _dbContext;

    public DeleteCityCommandHandler(IApplicationDbContext dbContext)
    {
        _dbContext = dbContext;
    }

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

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

        _dbContext.Cities.Remove(city);

        await _dbContext.SaveChangesAsync(cancellationToken);
    }
}