@using Iceshrimp.Frontend.Core.Miscellaneous
@using Iceshrimp.Frontend.Core.Services
@using Iceshrimp.Frontend.Core.Services.StateServicePatterns
@using Iceshrimp.Shared.Schemas
@using Ljbc1994.Blazor.IntersectionObserver
@using Ljbc1994.Blazor.IntersectionObserver.API
@using Ljbc1994.Blazor.IntersectionObserver.Components
@inject ApiService ApiService
@inject StateService StateService


    @if (_init)
    {
        <VirtualScroller NoteResponseList="State.Timeline" ReachedEnd="FetchOlder" ReachedStart="FetchNewer" />
    }
    else
    {
        <div>Loading</div>
    }

    @code {
        private TimelineState      State    { get; set; } = new()
        {
            Timeline = [],
            MaxId    = null,
            MinId    = null
        };
    private     bool               _init           = false;
    private     bool               LockFetch { get; set; }

    private async Task Initialize()
    {
        var pq  = new PaginationQuery() { Limit = 30 };
        var res = await ApiService.Timelines.GetHomeTimeline(pq);
        State.MaxId    = res[0].Id;
        State.MinId    = res.Last().Id;
        State.Timeline = res;
    }

    private async Task FetchOlder()
    {
        if (LockFetch) return;
        LockFetch = true;
        var pq  = new PaginationQuery() { Limit = 15, MaxId = State.MinId };
        var res = await ApiService.Timelines.GetHomeTimeline(pq);
        if (res.Count > 0)
        {
            State.MinId = res.Last().Id;
            State.Timeline.AddRange(res);
        }
        LockFetch = false;
    }

    private async Task FetchNewer()
    {
        if (LockFetch) return;
        LockFetch = true;
        var pq  = new PaginationQuery() { Limit = 15, MinId = State.MaxId };
        var res = await ApiService.Timelines.GetHomeTimeline(pq);
        if (res.Count > 0)
        {
            State.MinId = res.Last().Id;
            State.Timeline.InsertRange(0, res);
        }
        LockFetch = false;
    }

     protected override async Task OnAfterRenderAsync(bool firstRender)
     {
         if (firstRender)
         {
             try
             {
                 var timeline = StateService.Timeline.GetState("home");
                 State = timeline;
                 _init = true;
                 StateHasChanged();
             }
             catch (ArgumentException)
             {
                 await Initialize();
                 _init = true;
                 StateHasChanged();
             }
             
             
         }

         StateService.Timeline.SetState("home", State);
     }

}