using System.Linq;
using UnityEditor;
using UnityEngine;
using UnityEngine.UIElements;
using UnityEditor.Experimental.GraphView;

namespace UnityEditor.VFX.UI
{
    abstract class VFXEdgeController : Controller
    {
    }

    class VFXEdgeController<T> : VFXEdgeController where T : IVFXAnchorController
    {
        T m_Input;
        T m_Output;
        public VFXEdgeController(T input, T output)
        {
            if (input.direction != Direction.Input)
            {
                Debug.LogError("Input has the wrong direction");
            }

            if (output.direction != Direction.Output)
            {
                Debug.LogError("Input has the wrong direction");
            }
            m_Input = input;
            m_Output = output;

            m_Input.Connect(this);
            m_Output.Connect(this);
        }

        public T input { get { return m_Input; } }
        public T output { get { return m_Output; } }

        public override void OnDisable()
        {
            if (m_Input != null)
                m_Input.Disconnect(this);
            if (m_Output != null)
                m_Output.Disconnect(this);
            base.OnDisable();
        }

        public override void ApplyChanges()
        {
        }
    }

    internal class VFXDataEdgeController : VFXEdgeController<VFXDataAnchorController>
    {
        public VFXDataEdgeController(VFXDataAnchorController input, VFXDataAnchorController output) : base(input, output)
        {
        }
    }
}