using System;
using System.IO;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Extensions.Hosting;

namespace Dpz.Core.Infrastructure
{
    public sealed class TimedHostedService : IHostedService, IDisposable
    {
        private int executionCount = 0;
        private Timer _timer;
        private readonly Random _random = new Random();

        public Task StartAsync(CancellationToken cancellationToken)
        {
            _timer = new Timer(async x => await DoWorkAsync(x), null, TimeSpan.Zero, TimeSpan.FromSeconds(1));
            return Task.CompletedTask;
        }

        public async Task DoWorkAsync(object state)
        {
            if (executionCount >= 10)
            {
                _timer?.Change(Timeout.Infinite, 0);
                return;
            }


            var sleepTime = _random.Next(10, 61);
            Thread.Sleep(sleepTime * 1000);
            executionCount++;
            await File.AppendAllTextAsync(@"D:/doWork.txt",
                $"time:{DateTime.Now:yyyy-MM-dd HH:mm:ss} count:{executionCount} random:{sleepTime} ThreadId:{Thread.GetCurrentProcessorId()}\r\n",
                Encoding.UTF8);
        }

        public Task StopAsync(CancellationToken cancellationToken)
        {
            _timer?.Change(Timeout.Infinite, 0);

            return Task.CompletedTask;
        }

        public void Dispose()
        {
            _timer?.Dispose();
        }
    }
}