using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.XR.Interaction.Toolkit;
using DG.Tweening;      //DOTween 네임스페이스
using UnityEngine.Assertions;

public class FadeTeleportationProvider : TeleportationProvider
{
    public Image fadeScreen;
    public Color fadeColor = Color.black;
    public float fadeDuration = 0.5f;

    // Start is called before the first frame update
    void Start()
    {
        startLocomotion += FadeTeleportationProvider_startLocomotion;
        endLocomotion += FadeTeleportationProvider_endLocomotion;
        fadeScreen.color = fadeColor;
    }

    private void FadeTeleportationProvider_startLocomotion(LocomotionSystem obj)
    {
        print("Start Locomotion");
        //페이드아웃이 끝나면 Teleport 함수를 실행해라
        fadeScreen.DOFade(1f, fadeDuration).OnComplete(Teleport);       
    }

    private void FadeTeleportationProvider_endLocomotion(LocomotionSystem obj)
    {
        print("End Locomotion");
        fadeScreen.DOFade(0f, fadeDuration);
    }

    protected override void Update()
    {
        //텔레포트 요청
        if (!validRequest || !BeginLocomotion())
            return;
    }

    void Teleport()
    {
        print("Begin TeleporT!!!");

        //실제 텔레포트 하는 부분
        var xrRig = system.xrRig;
        if (xrRig != null)
        {
            switch (currentRequest.matchOrientation)
            {
                case MatchOrientation.WorldSpaceUp:
                    xrRig.MatchRigUp(Vector3.up);
                    break;
                case MatchOrientation.TargetUp:
                    xrRig.MatchRigUp(currentRequest.destinationRotation * Vector3.up);
                    break;
                case MatchOrientation.TargetUpAndForward:
                    xrRig.MatchRigUpCameraForward(currentRequest.destinationRotation * Vector3.up, currentRequest.destinationRotation * Vector3.forward);
                    break;
                case MatchOrientation.None:
                    // Change nothing. Maintain current rig rotation.
                    break;
                default:
                    Assert.IsTrue(false, $"Unhandled {nameof(MatchOrientation)}={currentRequest.matchOrientation}.");
                    break;
            }

            var heightAdjustment = xrRig.rig.transform.up * xrRig.cameraInRigSpaceHeight;

            var cameraDestination = currentRequest.destinationPosition + heightAdjustment;

            xrRig.MoveCameraToWorldLocation(cameraDestination);
        }

        EndLocomotion();
        validRequest = false;
    }
}