@using NexusReader.UI.Shared.Services
@using NexusReader.UI.Shared.Models
@using NexusReader.Application.DTOs.AI
@using Microsoft.Extensions.Logging
@inject KnowledgeCoordinator Coordinator
@inject IReaderInteractionService InteractionService
@inject IQuizStateService QuizService
@inject IJSRuntime JS
@inject ILogger<SelectionAiPanel> Logger

@if (IsVisible)
{
    <div class="selection-ai-panel @(_positionBelow ? "below" : "")" style="@_style">
        <button id="summary-btn" class="toolbar-btn primary @(IsLoadingSummary ? "loading" : "") @(IsAnyLoading ? "disabled cursor-not-allowed opacity-50" : "")" 
                disabled="@IsAnyLoading" 
                @onclick="RequestSummaryAsync">
            @if (IsLoadingSummary)
            {
                <svg class="animate-spin h-4 w-4 mr-2" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" style="animation: spin 1s linear infinite; width: 14px; height: 14px; color: currentColor; display: inline-block; margin-right: 4px;">
                    <circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4" style="opacity: 0.25;"></circle>
                    <path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z" style="opacity: 0.75;"></path>
                </svg>
                <span class="btn-text">Podsumowywanie...</span>
            }
            else
            {
                <NexusIcon Name="book-open" Size="14" Class="btn-icon" />
                <span class="btn-text">Podsumuj</span>
            }
        </button>
        <div class="toolbar-divider"></div>
        <button id="quiz-btn" class="toolbar-btn secondary @(IsLoadingQuiz ? "loading" : "") @(IsAnyLoading ? "disabled cursor-not-allowed opacity-50" : "")" 
                disabled="@IsAnyLoading" 
                @onclick="GenerateQuizAsync">
            @if (IsLoadingQuiz)
            {
                <svg class="animate-spin h-4 w-4 mr-2" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" style="animation: spin 1s linear infinite; width: 14px; height: 14px; color: currentColor; display: inline-block; margin-right: 4px;">
                    <circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4" style="opacity: 0.25;"></circle>
                    <path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z" style="opacity: 0.75;"></path>
                </svg>
                <span class="btn-text">Generowanie...</span>
            }
            else
            {
                <NexusIcon Name="target" Size="14" Class="btn-icon" />
                <span class="btn-text">Quiz</span>
            }
        </button>
    </div>
}

@code {
    [Parameter] public string SelectedText { get; set; } = string.Empty;
    [Parameter] public string BlockId { get; set; } = string.Empty;
    [Parameter] public SelectionCoordinates? Coordinates { get; set; }
    [Parameter] public string FullPageContent { get; set; } = string.Empty;

    private bool IsVisible => !string.IsNullOrEmpty(SelectedText) && Coordinates != null;
    private bool IsLoadingSummary = false;
    private bool IsLoadingQuiz = false;
    private bool IsAnyLoading => IsLoadingSummary || IsLoadingQuiz;

    private string _style = "visibility: hidden; opacity: 0; pointer-events: none;";
    private bool _positionBelow = false;
    private SelectionCoordinates? _lastCoordinates;

    protected override void OnParametersSet()
    {
        Logger.LogDebug("[SelectionAiPanel] Parameters set. SelectedText: {Length} chars, Coordinates: {Top}", SelectedText.Length, Coordinates?.Top);
        
        if (Coordinates != _lastCoordinates)
        {
            _lastCoordinates = Coordinates;
            _style = "visibility: hidden; opacity: 0; pointer-events: none;";
            _positionBelow = false;
        }

        // Reset loading states when parameters change
        IsLoadingSummary = false;
        IsLoadingQuiz = false;
    }

    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        if (IsVisible && _style.Contains("visibility: hidden"))
        {
            try
            {
                var module = await JS.InvokeAsync<IJSObjectReference>("import", "./_content/NexusReader.UI.Shared/js/selectionHandler.js");
                var result = await module.InvokeAsync<PositionResult>("positionToolbar");
                if (result != null)
                {
                    _style = string.Create(System.Globalization.CultureInfo.InvariantCulture, 
                        $"left: {result.Left:F1}px !important; " +
                        $"top: {result.Top:F1}px !important; " +
                        $"visibility: visible !important; " +
                        $"opacity: 1 !important; " +
                        $"pointer-events: auto !important;");
                    _positionBelow = result.Below;
                    StateHasChanged();
                }
            }
            catch (Exception ex)
            {
                Logger.LogWarning(ex, "[SelectionAiPanel] Error positioning toolbar.");
            }
        }
    }

    private async Task RequestSummaryAsync()
    {
        if (IsAnyLoading) return;
        IsLoadingSummary = true;
        StateHasChanged();

        try
        {
            var module = await JS.InvokeAsync<IJSObjectReference>("import", "./_content/NexusReader.UI.Shared/js/selectionHandler.js");
            var selectedText = await module.InvokeAsync<string>("getSelectionText");
            if (string.IsNullOrWhiteSpace(selectedText))
            {
                selectedText = SelectedText;
            }

            if (!string.IsNullOrWhiteSpace(selectedText))
            {
                var contextPrompt = !string.IsNullOrWhiteSpace(FullPageContent) 
                    ? $"ANALYSIS CONTEXT (Full Page Content):\n{FullPageContent}\n\nUSER SELECTION TO SUMMARIZE:\n" 
                    : "";
                
                _ = Coordinator.StartSelectionSummaryAsync($"{contextPrompt}{selectedText}");
                await CloseAsync();
                await InteractionService.RequestAssistant();
            }
        }
        catch (Exception ex)
        {
            Logger.LogError(ex, "[SelectionAiPanel] Error requesting summary for block {BlockId}.", BlockId);
        }
        finally
        {
            IsLoadingSummary = false;
            StateHasChanged();
        }
    }

    private async Task GenerateQuizAsync()
    {
        if (IsAnyLoading) return;
        IsLoadingQuiz = true;
        StateHasChanged();

        try
        {
            var module = await JS.InvokeAsync<IJSObjectReference>("import", "./_content/NexusReader.UI.Shared/js/selectionHandler.js");
            var selectedText = await module.InvokeAsync<string>("getSelectionText");
            if (string.IsNullOrWhiteSpace(selectedText))
            {
                selectedText = SelectedText;
            }

            if (!string.IsNullOrWhiteSpace(selectedText))
            {
                var contextPrompt = !string.IsNullOrWhiteSpace(FullPageContent) 
                    ? $"ANALYSIS CONTEXT (Full Page Content):\n{FullPageContent}\n\nUSER SELECTION TO SUMMARIZE:\n" 
                    : "";
                
                var result = await Coordinator.RequestSummaryAndQuizAsync($"{contextPrompt}{selectedText}");
                if (result.IsSuccess)
                {
                    await CloseAsync();
                    await QuizService.RequestQuiz(BlockId);
                }
            }
        }
        catch (Exception ex)
        {
            Logger.LogError(ex, "[SelectionAiPanel] Error generating quiz for block {BlockId}.", BlockId);
        }
        finally
        {
            IsLoadingQuiz = false;
            StateHasChanged();
        }
    }

    private async Task CloseAsync()
    {
        await InteractionService.NotifyTextSelected(string.Empty, string.Empty, null!);
    }

    private class PositionResult
    {
        public double Left { get; set; }
        public double Top { get; set; }
        public bool Below { get; set; }
    }
}