using Microsoft.Extensions.Hosting;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace EasyTemplate.Service
{
    public interface IBackgroundService
    {
        string Status { get; }
        int TickCount { get; }
        event EventHandler? StatusChanged;
    }

    public class BackgroundTimerService : BackgroundService, IBackgroundService
    {
        private Timer? _timer;
        public string Status { get; private set; } = "Stopped";
        public int TickCount { get; private set; }

        public event EventHandler? StatusChanged;

        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
        {
            _timer = new Timer(DoWork, null, TimeSpan.Zero, TimeSpan.FromSeconds(1));
            await Task.CompletedTask;
        }

        private void DoWork(object? state)
        {
            TickCount++;
            Status = "Running";
            StatusChanged?.Invoke(this, EventArgs.Empty);
        }

        public override async Task StopAsync(CancellationToken cancellationToken)
        {
            _timer?.Dispose();
            Status = "Stopped";
            StatusChanged?.Invoke(this, EventArgs.Empty);
            await base.StopAsync(cancellationToken);
        }
    }

}
