YouTube-Manager/Manager.App/Services/System/ClientManager.cs

using System.Net;
using DotBased.Monads;
using Manager.Data.Entities.LibraryContext;
using Manager.YouTube;

namespace Manager.App.Services.System;

public class ClientManager : BackgroundService
{
    private readonly List<YouTubeClient> _clients = [];
    private CancellationToken _cancellationToken;
    
    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        _cancellationToken = stoppingToken;
        stoppingToken.Register(CancellationRequested);
    }

    private void CancellationRequested()
    {
        // Clear up
    }

    public async Task<Result<YouTubeClient>> LoadClient(ClientAccountEntity accountEntity)
    {
        if (_cancellationToken.IsCancellationRequested)
        {
            return ResultError.Fail("Service is shutting down.");
        }

        var container = new CookieContainer();

        if (accountEntity.HttpCookies.Count != 0)
        {
            var cookieColl = new CookieCollection();
            foreach (var cookieEntity in accountEntity.HttpCookies)
            {
                cookieColl.Add(new Cookie(cookieEntity.Name, cookieEntity.Value, cookieEntity.Domain));
            }
            
            container.Add(cookieColl);
        }
        
        var ytClient = new YouTubeClient(container, accountEntity.UserAgent ?? "");
        await ytClient.GetStateAsync();

        return ytClient;
    }
}