using System.Collections;
using UnityEngine;

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

    [Header("Push Direction")]
    [SerializeField] private Transform pushDirectionPoint;

    [Header("Push Settings")]
    [SerializeField] private float pushDistance = 0.9f;
    [SerializeField] private float pushDuration = 0.18f;

    private bool hasPushed;
    private bool isPushing;

    public void PushPlayerOnce()
    {
        if (hasPushed || isPushing)
            return;

        if (xrOrigin == null ||
            playerCamera == null ||
            pushDirectionPoint == null)
        {
            Debug.LogWarning(
                "[PlayerPushToPoint] 연결되지 않은 오브젝트가 있습니다."
            );
            return;
        }

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

    private IEnumerator PushRoutine()
    {
        isPushing = true;

        // 플레이어에서 포인트로 향하는 방향
        Vector3 direction =
            pushDirectionPoint.position - playerCamera.position;

        // 수평 방향만 사용
        direction.y = 0f;

        if (direction.sqrMagnitude < 0.001f)
        {
            Debug.LogWarning(
                "[PlayerPushToPoint] 밀기 방향을 계산할 수 없습니다."
            );

            hasPushed = false;
            isPushing = false;
            yield break;
        }

        direction.Normalize();

        Vector3 startPosition = xrOrigin.position;
        Vector3 targetPosition =
            startPosition + direction * pushDistance;

        // 시작 높이를 그대로 고정
        float fixedY = startPosition.y;
        targetPosition.y = fixedY;

        bool controllerWasEnabled =
            characterController != null &&
            characterController.enabled;

        // 밀리는 동안 바닥이나 장애물 때문에 위로 올라가지 않도록 끔
        if (controllerWasEnabled)
            characterController.enabled = false;

        float duration = Mathf.Max(0.01f, pushDuration);
        float elapsed = 0f;

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

            float t = Mathf.Clamp01(elapsed / duration);
            float easedT = 1f - Mathf.Pow(1f - t, 3f);

            Vector3 nextPosition =
                Vector3.Lerp(startPosition, targetPosition, easedT);

            // 매 프레임 Y값 강제 고정
            nextPosition.y = fixedY;
            xrOrigin.position = nextPosition;

            yield return null;
        }

        // 마지막 위치 정확히 고정
        xrOrigin.position = targetPosition;

        if (controllerWasEnabled)
            characterController.enabled = true;

        isPushing = false;
    }

    public void ResetPush()
    {
        StopAllCoroutines();

        hasPushed = false;
        isPushing = false;

        if (characterController != null &&
            !characterController.enabled)
        {
            characterController.enabled = true;
        }
    }

    [ContextMenu("Test Push")]
    private void TestPush()
    {
        PushPlayerOnce();
    }

    [ContextMenu("Reset Push")]
    private void TestResetPush()
    {
        ResetPush();
    }
}