using Manager.App.Extensions;
using Manager.App.Services;
using Microsoft.AspNetCore.Components;

namespace Manager.App.Components.Pages;

public partial class Services : ComponentBase
{
    private string _searchText = "";
    private List<ExtendedBackgroundService> _backgroundServices = [];
    private readonly CancellationTokenSource _cts = new();

    protected override void OnInitialized()
    {
        _backgroundServices = ServiceRegistry.GetServices();
    }
    
    private Func<ExtendedBackgroundService, bool> QuickFilter
        => x => string.IsNullOrWhiteSpace(_searchText) || $"{x.Name} {x.Description} {x.State} {x.ExecuteInterval}".Contains(_searchText);

    private IAsyncEnumerable<ServiceEvent> GetEventAsyncEnumerable()
    {
        var asyncEnumerators = _backgroundServices.Select(x => x.ProgressEvents.GetStreamAsync());
        return AsyncEnumerableExtensions.Merge(asyncEnumerators, CancellationToken.None);
    }

    private List<ServiceEvent> GetInitialEvents()
    {
        var totalToGet = 1000 / _backgroundServices.Count;
        var initial = _backgroundServices
            .SelectMany(x => x.ProgressEvents.Items.TakeLast(totalToGet))
            .OrderBy(x => x.DateUtc);
        return initial.ToList();
    }

    public void Dispose()
    {
        _cts.Cancel();
        _cts.Dispose();
    }
}