using MatterHackers.Agg;
using MatterHackers.Agg.UI;

namespace MatterHackers.MatterControl.CustomWidgets
{
	public class DisableableWidget : GuiWidget
	{
		public GuiWidget disableOverlay;

		public DisableableWidget()
		{
			this.HAnchor = HAnchor.Stretch;
			this.VAnchor = VAnchor.Fit;

			disableOverlay = new GuiWidget(0, 0);

			this.BoundsChanged += (s, e) => EnsureCorrectBounds();
			this.ParentChanged += (s, e) => EnsureCorrectBounds();

			disableOverlay.Visible = false;
			base.AddChild(disableOverlay);
		}

		private void EnsureCorrectBounds()
		{
			if (Parent != null
				&& Parent.Visible && Parent.Width > 0
				&& Parent.Height > 0
				&& Parent.Children.Count > 1)
			{
				if (Children.IndexOf(disableOverlay) != Children.Count - 1)
				{
					Children.RemoveAt(Children.IndexOf(disableOverlay));
					disableOverlay.ClearRemovedFlag();
					Children.Add(disableOverlay);
				}

				var childBounds = GetChildrenBoundsIncludingMargins(considerChild: (parent, child) =>
				{
					if (child == disableOverlay)
					{
						return false;
					}

					return true;
				});

				if (childBounds != RectangleDouble.ZeroIntersection)
				{
					disableOverlay.LocalBounds = new RectangleDouble(childBounds.Left,
						childBounds.Bottom,
						childBounds.Right,
						childBounds.Top - disableOverlay.Margin.Top);
				}
			}
		}

		public enum EnableLevel { Disabled, ConfigOnly, Enabled };

		public void SetEnableLevel(EnableLevel enabledLevel)
		{
			disableOverlay.BackgroundColor = new Color(ActiveTheme.Instance.TertiaryBackgroundColor, 160);

			switch (enabledLevel)
			{
				case EnableLevel.Disabled:
					disableOverlay.Margin = new BorderDouble(0);
					disableOverlay.Visible = true;
					break;

				case EnableLevel.ConfigOnly:
					disableOverlay.Margin = new BorderDouble(0, 0, 0, ApplicationController.Instance.Theme.ButtonHeight);
					disableOverlay.Visible = true;
					break;

				case EnableLevel.Enabled:
					disableOverlay.Visible = false;
					break;
			}
		}
	}
}