using System.Numerics;
using DaggerFramework.Rendering;
using DaggerFramework.Utils;

namespace DaggerFramework.UI;

public abstract class UIElement
{
    public Rect Rect { get; set; } = new Rect();
    public SizeFlags VerticalSizeFlags { get; set; } = SizeFlags.Fill;
    public SizeFlags HorizontalSizeFlags { get; set; } = SizeFlags.Fill;

    public Vector2 ExpandRatio { get; set; } = Vector2.One;

    public UIElement()
    {
        children = new();
    }

    public void AddChild(UIElement child)
    {
        children.Add(child);
        child.parent = this;
    }

    public void Render(Renderer renderer)
    {
        Vector2 parentPos = parent != null ? parent.Rect.Position : Vector2.Zero;
        renderer.SetTransform(Rect.Position + parentPos, Vector2.Zero, 0);
        OnRender(renderer);

        foreach (UIElement child in children)
        {
            renderer.SetTransform(child.Rect.Position, Vector2.Zero, 0);
            child.Render(renderer);
        }
    }

    protected abstract void OnRender(Renderer renderer);

    protected List<UIElement> children;
    protected UIElement? parent;

    private Logger _logger = new(nameof(UIElement));
}


[Flags]
public enum SizeFlags
{
    ShrinkBegin,
    ShrinkCenter,
    ShrinkEnd,
    Fill
}