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

namespace CompServ.Hub
{
    internal class HubWorkerAssigner(ILogger<HubWorkerAssigner> logger, HubWorkerHolder holder) : BackgroundService
    {
        internal int _index = 0;
        internal int _assign = 0;

        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
        {
            logger.LogInformation("Start Assign service");

            while (stoppingToken.IsCancellationRequested == false)
            {
                string urlToQueue = null;
                int ratio = default;

                var takeFail = false;
                lock (holder.Workers)
                {
                    if (holder.Workers.Count == 0)
                    {
                        takeFail = true;
                    }
                    else
                    {
                        if (_index >= holder.Workers.Count)
                        {
                            _index = 0;
                            _assign = 0;
                        }

                        var item = holder.Workers[_index];
                        urlToQueue = item.url;
                        ratio = item.ratio;
                    }
                }

                if (takeFail)
                {
                    await Task.Delay(100, stoppingToken);
                    continue;
                }

                logger.LogInformation($"Prep: {urlToQueue}");
                await holder.Queue1.Writer.WriteAsync(urlToQueue, stoppingToken);

                //handle next worker with ratio
                _assign++;
                if (_assign >= ratio)
                {
                    _index++;
                    _assign = 0;

                    lock (holder.Workers)
                    {
                        if (_index >= holder.Workers.Count) _index = 0;
                    }
                }
            }
        }
    }
}