openscad-graph-editor

using Godot;
using JetBrains.Annotations;
using OpenScadGraphEditor.Library;
using OpenScadGraphEditor.Utils;
using OpenScadGraphEditor.Widgets;

namespace OpenScadGraphEditor.Nodes
{
    /// <summary>
    /// Operator for negating a boolean value.
    /// </summary>
    [UsedImplicitly]
    public class NotOperator : ScadNode, IAmAnExpression, IHaveCustomWidget,IHaveNodeBackground
    {
        public override string NodeTitle => "Not";
        public override string NodeQuickLookup => "!!";
        public override string NodeDescription => "Negates a boolean value (boolean NOT, !).";


        public NotOperator()
        {
            InputPorts
                .Boolean(allowLiteral:false);

            OutputPorts
                .Boolean(allowLiteral:false);
        }

        public override string GetPortDocumentation(PortId portId)
        {
            switch (portId.Port)
            {
                case 0 when portId.IsInput:
                    return "The value to negate.";
                case 0 when portId.IsOutput:
                    return "The negative of the input.";
                default: 
                    return "";
            }
        }


        public ScadNodeWidget InstantiateCustomWidget()
        {
            return Prefabs.New<SmallNodeWidget>();
        }

        public Texture NodeBackground => Resources.NotIcon;

        public override string Render(ScadGraph context, int portIndex)
        {
            var value = RenderInput(context, 0);
            return value.Empty() ? "" : $"!{value}";
        }
    }
}