@using MediatR
@using NexusReader.Application.Queries.Graph
@using Microsoft.JSInterop
@using NexusReader.UI.Shared.Services
@implements IAsyncDisposable
@inject IMediator Mediator
@inject IJSRuntime JS
@inject IFocusModeService FocusMode
@inject IKnowledgeGraphService GraphService
@inject IReaderInteractionService InteractionService

<div class="knowledge-graph-container @(GraphService.IsLoading ? "loading" : "")" id="@ContainerId">
    @if (GraphService.IsLoading || GraphService.CurrentGraphData == null)
    {
        <div class="loading-state">
            <div class="preloader-robot">
                <NexusIcon Name="robot" Size="64" Class="neon-pulse" />
                <div class="scan-line"></div>
            </div>
            <NexusTypography Variant="NexusTypography.TypographyVariant.UI">Mapowanie relacji rozdziału...</NexusTypography>
        </div>
    }
    else
    {
        <div class="graph-controls">
            <button class="zoom-btn" @onclick="ZoomIn" title="Zoom In">+</button>
            <button class="zoom-btn" @onclick="ZoomOut" title="Zoom Out">−</button>
            <button class="zoom-btn reset" @onclick="ZoomReset" title="Reset">⟲</button>
        </div>
    }
</div>


@code {
    [Parameter] public EventCallback<string> OnNodeSelected { get; set; }

    private string ContainerId = "d3-graph-container";
    private IJSObjectReference? _module;
    private DotNetObjectReference<KnowledgeGraph>? _dotNetHelper;

    protected override void OnInitialized()
    {
        FocusMode.OnFocusModeChanged += HandleFocusSimulation;
        GraphService.OnGraphUpdated += HandleGraphUpdate;
        GraphService.OnActiveNodeChanged += HandleActiveNodeChange;
        GraphService.OnLoadingChanged += HandleLoadingChange;
    }

    private async Task HandleGraphUpdate()
    {
        if (_module == null) return;
        
        if (GraphService.CurrentGraphData == null)
        {
            await _module.InvokeVoidAsync("clear");
        }
        else
        {
            await _module.InvokeVoidAsync("updateData", GraphService.CurrentGraphData);
        }
        
        await InvokeAsync(StateHasChanged);
    }

    private async Task HandleActiveNodeChange(string nodeId)
    {
        if (_module == null) return;
        await _module.InvokeVoidAsync("setActiveNode", nodeId);
    }

    private async Task HandleLoadingChange(bool isLoading)
    {
        await InvokeAsync(StateHasChanged);
    }

    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        if (firstRender)
        {
            await InitializeGraphAsync();
            
            if (GraphService.CurrentGraphData != null)
            {
                await HandleGraphUpdate();
            }
        }
    }

    private async Task InitializeGraphAsync()
    {
        _module = await JS.InvokeAsync<IJSObjectReference>("import", "./_content/NexusReader.UI.Shared/js/knowledgeGraph.js");
        _dotNetHelper = DotNetObjectReference.Create(this);
        await _module.InvokeVoidAsync("mount", ContainerId, GraphService.CurrentGraphData, _dotNetHelper);
    }

    private async Task ZoomIn() => await (_module?.InvokeVoidAsync("zoomIn") ?? ValueTask.CompletedTask);
    private async Task ZoomOut() => await (_module?.InvokeVoidAsync("zoomOut") ?? ValueTask.CompletedTask);
    private async Task ZoomReset() => await (_module?.InvokeVoidAsync("zoomReset") ?? ValueTask.CompletedTask);

    [JSInvokable]
    public async Task OnNodeClicked(string nodeId)
    {
        await InteractionService.NotifyNodeSelected(nodeId);
        
        if (OnNodeSelected.HasDelegate)
        {
            await OnNodeSelected.InvokeAsync(nodeId);
        }
    }


    private async Task HandleFocusSimulation()
    {
        if (_module == null) return;
        try
        {
            if (FocusMode.IsFocusModeActive)
                await _module.InvokeVoidAsync("pause");
            else
                await _module.InvokeVoidAsync("resume");
        }
        catch { }
    }

    public async ValueTask DisposeAsync()
    {
        FocusMode.OnFocusModeChanged -= HandleFocusSimulation;
        GraphService.OnGraphUpdated -= HandleGraphUpdate;
        GraphService.OnActiveNodeChanged -= HandleActiveNodeChange;
        GraphService.OnLoadingChanged -= HandleLoadingChange;
        
        try
        {
            if (_module is not null)
            {
                await _module.InvokeVoidAsync("unmount", ContainerId);
                await _module.DisposeAsync();
            }
        }
        catch { }
        
        _dotNetHelper?.Dispose();
    }
}