using System;
using System.Threading;
using System.Threading.Tasks;
using LavishVMAPI;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using TinyIpc.DependencyInjection;

namespace MRBot.Services
{
    internal sealed class CommandProcessor : BackgroundService
    {
        private readonly ITinyIpcFactory _tinyIpcFactory;
        private readonly ILogger<CommandProcessor> _logger;

        public CommandProcessor(ITinyIpcFactory tinyIpcFactory, ILogger<CommandProcessor> logger)
        {
            _tinyIpcFactory = tinyIpcFactory;
            _logger = logger;
        }

        public override Task StartAsync(CancellationToken cancellationToken)
        {
            _logger.LogInformation("Starting command processor");
            return base.StartAsync(cancellationToken);
        }

        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
        {
            using var tinyIpcInstance = _tinyIpcFactory.CreateInstance();
            try
            {
                await foreach (var message in tinyIpcInstance.MessageBus.SubscribeAsync(stoppingToken))
                {
                    if(stoppingToken.IsCancellationRequested) return;
                    _logger.LogInformation($"Received message: {message}");
                }
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
                throw;
            }
        }
    }
}