using System.Collections.ObjectModel;
using System.Linq;
using ytLive.Helpers;
using ytLive.Models;
using ytLive.Services;

namespace ytLive.ViewModels;

public partial class MainViewModel : ViewModelBase
{

    private readonly ChatOverlayLayer _chatLayer;
    private readonly AlertOverlayLayer _alertLayer;

    /// <summary>The live chat message buffer — the same collection the
    /// <see cref="ChatOverlayLayer"/> owns; here so XAML can bind it and the
    /// left panel can subscribe to its changes.</summary>
    public ObservableCollection<ChatMessage> ChatMessages => _chatLayer.Messages;

    /// <summary>The Add → YouTube Chat menu item: enabled only while no chat layer exists
    /// anywhere — one chat overlay per layout.</summary>
    public bool CanAddYouTubeChat
        => StagedScene != null
           && !Scenes.Any(s => s.Elements.OfType<Source>().Any(e => e.Type == SourceType.ChatBox));

    /// <summary>The Add → Stream Alerts menu item: one alert zone per layout
    /// (multiple zones would double-play every event).</summary>
    public bool CanAddAlerts
        => StagedScene != null
           && !Scenes.Any(s => s.Elements.OfType<Source>().Any(e => e.Type == SourceType.AlertBox));

    public bool ShowChatInactiveMessage => !IsLive;

    private void OnChatMessageReceived(ChatMessage message)
    {
        _chatLayer.OnMessageReceived(message, Scenes);
        _alertLayer.OnMessageReceived(message, Scenes);
    }

    private void UpdateChatBoxPreview(Source chatBox, IReadOnlyList<ChatMessage>? messages = null)
        => _chatLayer.UpdatePreview(chatBox, messages);

    private VideoFrame? RenderChatBox(Source chatBox)
        => _chatLayer.RenderFrame(chatBox);

    private void UpdateAlertBoxPreview(Source alertBox)
        => _alertLayer.UpdatePreview(alertBox);

    private VideoFrame? RenderAlertBox(Source alertBox)
        => _alertLayer.RenderFrame(alertBox);

    private void StartMockChatPreview()
        => _chatLayer.StartMockPreview(Scenes);

    private void StopMockChatPreview()
        => _chatLayer.StopMockPreview();

    private void UpdateActiveChatBoxPreviews()
        => _chatLayer.UpdateConfiguredBoxes(Scenes);

    private void UpdateActiveAlertBoxPreviews()
        => _alertLayer.UpdateConfiguredBoxes(Scenes);
}