using System;
using System.Threading;
using System.Threading.Tasks;
using MediatR;
using Microsoft.Extensions.Logging;

namespace HN.Infrastructure.Behaviors
{
  public sealed class LoggerBehavior<TRequest, TResponse> : IPipelineBehavior<TRequest, TResponse>
  {
    private readonly ILoggerFactory _factory;

    public LoggerBehavior(ILoggerFactory factory)
    {
      _factory = factory;
    }

    public async Task<TResponse> Handle(TRequest request, CancellationToken cancellationToken, RequestHandlerDelegate<TResponse> next)
    {
      var logger = _factory.CreateLogger(request.GetType());

      logger.LogInformation("Processing request {0} at {1}", request, DateTime.Now);

      var response = await next();

      logger.LogInformation("Processed request {0} at {1}", request, DateTime.Now);

      return response;
    }
  }
}