using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Runtime.CompilerServices;
using System.Windows.Media.Imaging;

namespace ytLive.Models;

public class Scene : INotifyPropertyChanged
{
    public string Id { get; init; } = Guid.NewGuid().ToString();

    private string _name = string.Empty;
    private bool _isHidden;
    private bool _hasBackground;
    private bool _hasSocialBar;
    private bool _isStaged;
    private bool _isLive;
    private string? _customBackgroundPath;
    private bool _useDefaultBackground = true;

    public bool IsStaged
    {
        get => _isStaged;
        set => Set(ref _isStaged, value);
    }

    public bool IsLive
    {
        get => _isLive;
        set => Set(ref _isLive, value);
    }

    /// <summary>
    /// User-selected background image file path (FQFN). Null means use the app default.
    /// Stored as a reference only — the image file is not copied into the DB.
    /// </summary>
    public string? CustomBackgroundPath
    {
        get => _customBackgroundPath;
        set => Set(ref _customBackgroundPath, value);
    }

    /// <summary>
    /// When true, the shipped default background image is used and CustomBackgroundPath
    /// is ignored (but preserved). Toggled by the pill-switch in the properties panel.
    /// </summary>
    public bool UseDefaultBackground
    {
        get => _useDefaultBackground;
        set => Set(ref _useDefaultBackground, value);
    }

    public string Name
    {
        get => _name;
        set => Set(ref _name, value);
    }

    public bool IsHidden
    {
        get => _isHidden;
        set => Set(ref _isHidden, value);
    }

    /// <summary>
    /// Whether the scene has a live desktop/game background layer. Enforced by
    /// policy: only the canonical Live scene ever has one (see SceneCatalog).
    /// </summary>
    public bool HasBackground
    {
        get => _hasBackground;
        set => Set(ref _hasBackground, value);
    }

    /// <summary>
    /// Whether the social bar plays on this scene. Toggled by the footer [+]/[-]
    /// control — the socials themselves are a global resource (see SocialsConfig).
    /// </summary>
    public bool HasSocialBar
    {
        get => _hasSocialBar;
        set => Set(ref _hasSocialBar, value);
    }

    /// <summary>
    /// The scene's rendered elements in z-order (back to front): multi-instance
    /// Sources plus this scene's webcam usage (<see cref="WebcamConfig"/>), if any.
    /// </summary>
    public ObservableCollection<SceneElement> Elements { get; } = new();

    /// <summary>This scene's webcam usage, or null if the creator hasn't added the webcam here.</summary>
    public WebcamSceneConfig? WebcamConfig => Elements.OfType<WebcamSceneConfig>().FirstOrDefault();

    public bool IsChatScene { get; init; }

    private BitmapSource? _snapshot;

    /// <summary>
    /// Cached thumbnail snapshot of this scene for the control surface strip.
    /// Updated by the compositor when the scene is not live-previewed.
    /// </summary>
    public BitmapSource? Snapshot
    {
        get => _snapshot;
        set => Set(ref _snapshot, value);
    }

    public event PropertyChangedEventHandler? PropertyChanged;

    private void Set<T>(ref T field, T value, [CallerMemberName] string? propertyName = null)
    {
        if (EqualityComparer<T>.Default.Equals(field, value)) return;
        field = value;
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}