#if USING_XRI

using System.Collections;
using System.Collections.Generic;
using System;
using UnityEngine;
using UnityEngine.XR.Interaction.Toolkit;

namespace SimplifyXR
{
    public enum XRInteractableEvent
    {
        HoverEntered,
        HoverExited,
        SelectEntered,
        SelectExited,
        Activated,
        Deactivated
    }

    [Serializable]
    public class XRInteractablePair
    {
        [Required, Tooltip("The interactable object"), SerializeField]
        public XRBaseInteractable interactable;

        [Conditional("interactable", null, ComparisonType.NotEqual),
            Tooltip("The interactable event to listen to"), SerializeField]
        public XRInteractableEvent interactableEvent;
    }

    /// <summary>
    /// Initiates a sequence based on an interactable event trigger
    /// </summary>
    [DirectiveCategory(DirectiveCategories.Initiator, DirectiveSubCategory.UserInteraction, prettyName = "XR Interactable Event", directiveLibrary = DirectiveLibrary.XRI, directiveInfo = "This initiator starts a sequence when a <b>XR Interactable Event</b> is <b>detected.</b>")]

    public class XRInteractableInitiator : EventInitiator
    {
        [Tooltip("Listen to multiple interactions")]
        public bool listenToMultiple;

        [Required, Tooltip("The interactable object"),
            Conditional("listenToMultiple", false, ComparisonType.Equals)]
        public XRBaseInteractable interactable;

        [Conditional("interactable", null, ComparisonType.NotEqual),
            Conditional("listenToMultiple", true, ComparisonType.NotEqual),
            Tooltip("The interactable event to listen to")]
        public XRInteractableEvent interactableEvent;

        [Conditional("listenToMultiple", true, ComparisonType.Equals),
            Tooltip("The interactable event to listen to")]
        public List<XRInteractablePair> interactables;

        [HideInInspector]
        public string eventFieldInfoName;

        public override List<KnobKeywords> ReceiveKeywords()
        {
            return new List<KnobKeywords>();
        }

        public override List<KnobKeywords> SendKeywords()
        {
            return new List<KnobKeywords>() { new KnobKeywords("BaseInteractionEvent", typeof(BaseInteractionEventArgs)) };
        }

        #region interactable event handlers

        void RegisterEventHandler(XRBaseInteractable interactable, XRInteractableEvent interactableEvent, bool register = true)
        {
            if (interactable != null)
            {
                switch (interactableEvent)
                {
                    case XRInteractableEvent.HoverEntered:
                        if (register) interactable.hoverEntered.AddListener(SingleTypeInitiate);
                        if (!register) interactable.hoverEntered.RemoveListener(SingleTypeInitiate);
                        break;
                    case XRInteractableEvent.HoverExited:
                        if (register) interactable.hoverExited.AddListener(SingleTypeInitiate);
                        if (!register) interactable.hoverExited.RemoveListener(SingleTypeInitiate);
                        break;
                    case XRInteractableEvent.SelectEntered:
                        if (register) interactable.selectEntered.AddListener(SingleTypeInitiate);
                        if (!register) interactable.selectEntered.RemoveListener(SingleTypeInitiate);
                        break;
                    case XRInteractableEvent.SelectExited:
                        if (register) interactable.selectExited.AddListener(SingleTypeInitiate);
                        if (!register) interactable.selectExited.RemoveListener(SingleTypeInitiate);
                        break;
                    case XRInteractableEvent.Activated:
                        if (register) interactable.activated.AddListener(SingleTypeInitiate);
                        if (!register) interactable.activated.RemoveListener(SingleTypeInitiate);
                        break;
                    case XRInteractableEvent.Deactivated:
                        if (register) interactable.deactivated.AddListener(SingleTypeInitiate);
                        if (!register) interactable.deactivated.RemoveListener(SingleTypeInitiate);
                        break;
                }
            }
        }
        #endregion

        protected new void Awake()
        {
            base.Awake();
            if (enabled) RegisterEvents(true);
        }

        protected void RegisterEvents(bool register)
        {
            if (!listenToMultiple)
            {
                RegisterEventHandler(interactable, interactableEvent, register);
            }
            else
            {
                foreach (XRInteractablePair interactablePair in interactables)
                {
                    RegisterEventHandler(interactablePair.interactable, interactableEvent, register);
                }
            }
        }

        protected new void OnDestroy()
        {
            base.OnDestroy();
            RegisterEvents(false);
        }
        public void SingleTypeInitiate(BaseInteractionEventArgs args)
        {
            SendData(args);
            base.Initiate();
        }

        void SendData(BaseInteractionEventArgs args)
        {
            //Debug.Log("[" + this.name + "]: " + "XRInteractableInitiator -> " + "SendData(" + args.interactorObject.transform.name + "," + args.interactableObject.transform.name + ")");
            AddPassableData(new List<string> { "BaseInteractionEvent" }, new List<object> { args });
        }
    }
}
#endif

