@using NLog
@using NLog.Targets
@using Wabbajack.App.Blazor.Utility
@using System.Reactive.Linq
@namespace Wabbajack.App.Blazor.Components
@implements IDisposable

<div id="virtual-logger">
    <Virtualize Items="_logs" Context="logItem" OverscanCount="5" ItemSize="24">
        <span style="height: 24px">@logItem</span>
    </Virtualize>
</div>

@code {
    // TODO: [Low] More parameters to customise the logger. E.g. Reverse order.
    // TODO: [High] Find a way to auto-scroll. (JS interop?) 

    private UiLoggerTarget? _loggerTarget;
    private ICollection<string> _logs = new List<string>();

    private bool _shouldRender = false;
    protected override bool ShouldRender() => _shouldRender;

    private IDisposable? _disposable;
    
    protected override Task OnInitializedAsync()
    {
        _loggerTarget = LogManager.Configuration.FindTargetByName<UiLoggerTarget>("ui");

        _disposable = _loggerTarget.Logs.Sample(TimeSpan.FromMilliseconds(250)).Subscribe(next =>
        {
            _logs.Add(next);
            InvokeAsync(StateHasChanged);
        });

        _shouldRender = true;
        return Task.CompletedTask;
    }

    public void Dispose() => _disposable?.Dispose();
}