Nexus.Reader/src/NexusReader.UI.Shared/Components/Organisms/MobileReaderToolbar.razor

@using NexusReader.UI.Shared.Components.Atoms
@using NexusReader.UI.Shared.Services
@using NexusReader.Application.Utilities
@namespace NexusReader.UI.Shared.Components.Organisms
@inject IReaderInteractionService InteractionService

<div class="nexus-unified-mobile-toolbar">
    <!-- LEFT SLOT: Progress & Section Checkpoints -->
    <div class="toolbar-slot left-slot" @onclick="ToggleCheckpoints" title="Rozdziały i checkpoints">
        <div class="progress-ring-wrapper">
            <svg class="progress-ring" width="38" height="38">
                <circle class="progress-ring-track" stroke="rgba(255,255,255,0.06)" stroke-width="2.5" fill="transparent" r="16" cx="19" cy="19" />
                <circle class="progress-ring-indicator" stroke="var(--nexus-neon, #00FF99)" stroke-width="2.5" fill="transparent" r="16" cx="19" cy="19"
                        stroke-dasharray="100.53" stroke-dashoffset="@GetDashOffset()" />
            </svg>
            <span class="progress-text">@ScrollPercentage%</span>
        </div>
        <div class="progress-info">
            <span class="slot-label">Postęp</span>
            <span class="slot-desc">Checkpoints</span>
        </div>
    </div>

    <!-- CENTER SLOT: Global AI Assistant Glowing Trigger -->
    <div class="toolbar-slot center-slot">
        <button class="btn-nexus-ai-core" @onclick="HandleAssistantClick" aria-label="Asystent AI">
            <div class="pulse-ring"></div>
            <div class="pulse-ring-outer"></div>
            <NexusIcon Name="robot" Size="22" Class="ai-core-icon" />
        </button>
    </div>

    <!-- RIGHT SLOT: Context View Toggles -->
    <div class="toolbar-slot right-slot">
        <button class="nav-toggle-btn @(ActiveTab == MobileReaderTab.Reader ? "active" : "")" 
                @onclick="() => ChangeTab(MobileReaderTab.Reader)" 
                aria-label="Tekst">
            <NexusIcon Name="book-open" Size="18" />
            <span>Tekst</span>
        </button>
        <button class="nav-toggle-btn @(ActiveTab == MobileReaderTab.Graph ? "active" : "")" 
                @onclick="() => ChangeTab(MobileReaderTab.Graph)" 
                aria-label="Graf">
            <NexusIcon Name="share-2" Size="18" />
            <span>Graf</span>
        </button>
        <button class="nav-toggle-btn @(ActiveTab == MobileReaderTab.Concepts ? "active" : "")" 
                @onclick="() => ChangeTab(MobileReaderTab.Concepts)" 
                aria-label="Mapa">
            <NexusIcon Name="map" Size="18" />
            <span>Mapa</span>
        </button>
    </div>
</div>

<!-- SECTION CHECKPOINTS OVERLAY -->
<div class="checkpoints-overlay @(IsCheckpointsOpen ? "is-open" : "")">
    <div class="checkpoints-backdrop" @onclick="ToggleCheckpoints"></div>
    <div class="checkpoints-sheet">
        <div class="sheet-drag-handle"></div>
        <header class="checkpoints-header">
            <h4>Checkpoints Sekcji</h4>
            <button class="close-checkpoints-btn" @onclick="ToggleCheckpoints">
                <NexusIcon Name="close" Size="16" />
            </button>
        </header>
        <div class="checkpoints-body">
            @if (Checkpoints == null || !Checkpoints.Any())
            {
                <div class="empty-checkpoints">
                    <NexusIcon Name="info" Size="20" />
                    <p>Brak punktów kontrolnych w tym rozdziale.</p>
                </div>
            }
            else
            {
                <div class="checkpoints-list">
                    @foreach (var cp in Checkpoints)
                    {
                        var isCurrent = cp == InteractionService.CurrentBlockId;
                        <div class="checkpoint-item @(isCurrent ? "active" : "")" @onclick="() => SelectCheckpoint(cp)">
                            <div class="checkpoint-indicator">
                                <div class="indicator-dot"></div>
                                <div class="indicator-line"></div>
                            </div>
                            <div class="checkpoint-details">
                                <span class="checkpoint-id">@cp.ToUpper()</span>
                                <span class="checkpoint-label">@(isCurrent ? "Aktualna sekcja" : "Przejdź do sekcji")</span>
                            </div>
                            <NexusIcon Name="chevron-right" Size="14" Class="arrow-icon" />
                        </div>
                    }
                </div>
            }
        </div>
    </div>
</div>

@code {
    [Parameter] public int ScrollPercentage { get; set; }
    [Parameter] public MobileReaderTab ActiveTab { get; set; }
    [Parameter] public EventCallback<MobileReaderTab> OnTabChanged { get; set; }
    [Parameter] public EventCallback OnAssistantClick { get; set; }
    [Parameter] public List<string> Checkpoints { get; set; } = new();

    private bool IsCheckpointsOpen { get; set; }

    public enum MobileReaderTab
    {
        Reader,
        Graph,
        Concepts
    }

    private double GetDashOffset()
    {
        // Circumference of r=16 is 2 * pi * 16 = 100.53
        double circumference = 100.53;
        double progress = Math.Clamp(ScrollPercentage, 0, 100);
        return circumference - (progress / 100.0) * circumference;
    }

    private void ToggleCheckpoints()
    {
        IsCheckpointsOpen = !IsCheckpointsOpen;
    }

    private async Task SelectCheckpoint(string checkpointId)
    {
        IsCheckpointsOpen = false;
        // Scroll to the targeted block
        await InteractionService.RequestScrollToBlock(checkpointId);
        // Ensure user is on the text reading tab to see the scroll happen
        if (ActiveTab != MobileReaderTab.Reader)
        {
            await ChangeTab(MobileReaderTab.Reader);
        }
    }

    private async Task ChangeTab(MobileReaderTab tab)
    {
        if (OnTabChanged.HasDelegate)
        {
            await OnTabChanged.InvokeAsync(tab);
        }
    }

    private async Task HandleAssistantClick()
    {
        if (OnAssistantClick.HasDelegate)
        {
            await OnAssistantClick.InvokeAsync();
        }
    }
}