using UnityEngine;
using UnityEngine.XR.Interaction.Toolkit;

namespace jeanf.vrplayer
{
    public class GameplayHand : BaseHand
{
    // The interactor we react to
    [SerializeField] private UnityEngine.XR.Interaction.Toolkit.Interactors.XRBaseInteractor targetInteractor = null;

    private void OnEnable()
    {
        // Subscribe to selected events
        targetInteractor.selectEntered.AddListener(TryApplyObjectPose);
        targetInteractor.selectExited.AddListener(TryApplyDefaultPose);
    }

    private void OnDisable()
    {
        // Unsubscribe to selected events
        targetInteractor.selectEntered.RemoveListener(TryApplyObjectPose);
        targetInteractor.selectExited.RemoveListener(TryApplyDefaultPose);
    }

    private void TryApplyObjectPose(SelectEnterEventArgs args)
    {
        var interactable = args.interactableObject as UnityEngine.XR.Interaction.Toolkit.Interactables.XRBaseInteractable;
        // Try and get pose container, and apply
        if (interactable != null && interactable.TryGetComponent(out PoseContainer poseContainer))
        {
            ApplyPose(poseContainer.pose);
        }
    }

    private void TryApplyDefaultPose(SelectExitEventArgs args)
    {
        var interactable = args.interactableObject as UnityEngine.XR.Interaction.Toolkit.Interactables.XRBaseInteractable;
    
        // Try and get pose container, and apply
        if (interactable != null && interactable.TryGetComponent(out PoseContainer poseContainer))
        {
            ApplyDefaultPose();
        }
    }

    public override void ApplyOffset(Vector3 position, Quaternion rotation)
    {
        // Invert since the we're moving the attach point instead of the hand
        Vector3 finalPosition = position * -1.0f;
        Quaternion finalRotation = Quaternion.Inverse(rotation);

        // Since it's a local position, we can just rotate around zero
        finalPosition = finalPosition.RotatePointAroundPivot(Vector3.zero, finalRotation.eulerAngles);

        // Set the position and rotach of attach
        targetInteractor.attachTransform.localPosition = finalPosition;
        targetInteractor.attachTransform.localRotation = finalRotation;
    }

    private void OnValidate()
    {
        // Let's have this done automatically, but not hide the requirement
        if (!targetInteractor)
        {
            targetInteractor = GetComponentInParent<UnityEngine.XR.Interaction.Toolkit.Interactors.XRBaseInteractor>();
        }
    }
}
}