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

namespace AutobusApi.Application.Buses.Commands.DeleteBus;

public class DeleteBusCommandHandler : IRequestHandler<DeleteBusCommand>
{
    private readonly IApplicationDbContext _dbContext;

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

    public async Task Handle(
        DeleteBusCommand request,
        CancellationToken cancellationToken)
    {
        var bus = await _dbContext.Buses
            .SingleOrDefaultAsync(c => c.Id == request.Id, cancellationToken);

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

        _dbContext.Buses.Remove(bus);

        await _dbContext.SaveChangesAsync(cancellationToken);
    }
}