namespace Dashboard.Windowing
{
    /// <summary>
    /// Interface for a class that composites multiple windows together.
    /// </summary>
    public interface ICompositor : IDisposable
    {
        void Composite(IPhysicalWindow window, IEnumerable<IVirtualWindow> windows);
    }

    /// <summary>
    /// Interface for classes that implement a window manager.
    /// </summary>
    public interface IWindowManager : IEnumerable<IVirtualWindow>, IEventListener, IPaintable, IDisposable
    {
        /// <summary>
        /// The physical window that this window manager is associated with.
        /// </summary>
        IPhysicalWindow PhysicalWindow { get; }

        /// <summary>
        /// The compositor that will composite all virtual windows.
        /// </summary>
        ICompositor Compositor { get; set; }

        /// <summary>
        /// The window that is currently focused.
        /// </summary>
        IVirtualWindow? FocusedWindow { get; }

        /// <summary>
        /// Create a virtual window.
        /// </summary>
        /// <returns>Virtual window handle.</returns>
        IVirtualWindow CreateWindow();

        /// <summary>
        /// Focus a virtual window, if it is owned by this window manager.
        /// </summary>
        /// <param name="window">The window to focus.</param>
        void Focus(IVirtualWindow window);
    }
}