using System.Collections;
using UnityEngine;

public class PlayerPushToPoint : MonoBehaviour
{
    [Header("Player")]
    [SerializeField] private Transform xrOrigin;
    [SerializeField] private Transform playerCamera;
    [SerializeField] private CharacterController characterController;

    [Header("Target")]
    [SerializeField] private Transform pushDirectionPoint;

    [Header("Push")]
    [SerializeField] private float pushDuration = 0.2f;

    private bool hasPushed;
    private bool isPushing;

    // 타임라인에서 충돌 순간에 호출
    public void PushPlayerOnce()
    {
        if (hasPushed || isPushing)
            return;

        if (xrOrigin == null || playerCamera == null || pushDirectionPoint == null)
        {
            Debug.LogWarning("플레이어 밀기 설정이 비어 있습니다.");
            return;
        }

        hasPushed = true;
        StartCoroutine(PushRoutine());
    }

    private IEnumerator PushRoutine()
    {
        isPushing = true;

        // 카메라의 현재 위치가 목표 지점까지 가기 위해 필요한 이동량
        Vector3 totalMovement =
            pushDirectionPoint.position - playerCamera.position;

        // VR 플레이어 높이는 변경하지 않음
        totalMovement.y = 0f;

        float elapsed = 0f;
        Vector3 movedAmount = Vector3.zero;

        while (elapsed < pushDuration)
        {
            elapsed += Time.deltaTime;

            float t = Mathf.Clamp01(elapsed / pushDuration);

            // 처음에 빠르게 밀리고 끝에서 부드럽게 멈춤
            float easedT = 1f - Mathf.Pow(1f - t, 3f);

            Vector3 targetMovement = totalMovement * easedT;
            Vector3 frameMovement = targetMovement - movedAmount;

            if (characterController != null &&
                characterController.enabled)
            {
                characterController.Move(frameMovement);
            }
            else
            {
                xrOrigin.position += frameMovement;
            }

            movedAmount = targetMovement;
            yield return null;
        }

        isPushing = false;
    }

    // 반복 테스트할 때만 사용
    public void ResetPush()
    {
        hasPushed = false;
    }
}