using System.Collections;
using UnityEngine;

public class SpotlightFall : MonoBehaviour
{
    [Header("떨어질 조명")]
    [SerializeField] private Transform spotlight;

    [Header("도착 위치")]
    [SerializeField] private Transform fallEndPoint;

    [Header("낙하 설정")]
    [SerializeField] private float fallDuration = 1f;

    [Header("충돌 사운드")]
    [SerializeField] private AudioSource impactAudioSource;
    [SerializeField] private AudioClip impactSound;

    [Range(0f, 1f)]
    [SerializeField] private float impactVolume = 1f;

    [Tooltip("조명이 도착하기 몇 초 전에 소리를 재생할지")]
    [SerializeField] private float impactSoundLeadTime = 0.12f;

    private Vector3 startPosition;
    private Quaternion startRotation;

    private bool hasFallen;
    private bool isFalling;

    private void Awake()
    {
        if (spotlight != null)
        {
            startPosition = spotlight.position;
            startRotation = spotlight.rotation;
        }
    }

    public void DropSpotlight()
    {
        if (hasFallen || isFalling)
            return;

        if (spotlight == null)
        {
            Debug.LogWarning(
                "[SpotlightFall] Spotlight가 연결되지 않았습니다."
            );
            return;
        }

        if (fallEndPoint == null)
        {
            Debug.LogWarning(
                "[SpotlightFall] Fall End Point가 연결되지 않았습니다."
            );
            return;
        }

        hasFallen = true;
        StartCoroutine(FallRoutine());
    }

    private IEnumerator FallRoutine()
    {
        isFalling = true;

        Vector3 fallStartPosition = spotlight.position;
        Vector3 targetPosition = fallEndPoint.position;

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

        bool impactSoundPlayed = false;

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

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

            // 처음에는 느리고 아래로 갈수록 빠르게 낙하
            float acceleratedT = t * t * t;

            spotlight.position = Vector3.Lerp(
                fallStartPosition,
                targetPosition,
                acceleratedT
            );

            // 완전히 도착하기 조금 전에 와장창 소리 재생
            if (!impactSoundPlayed &&
                duration - elapsed <= impactSoundLeadTime)
            {
                impactSoundPlayed = true;
                PlayImpactSound();
            }

            yield return null;
        }

        // 마지막 위치 정확히 맞추기
        spotlight.position = targetPosition;

        // Lead Time이 너무 작아 소리가 실행되지 않았을 경우 대비
        if (!impactSoundPlayed)
        {
            PlayImpactSound();
        }

        isFalling = false;
    }

    private void PlayImpactSound()
    {
        if (impactAudioSource == null || impactSound == null)
            return;

        impactAudioSource.PlayOneShot(
            impactSound,
            impactVolume
        );
    }

    public void ResetFall()
    {
        StopAllCoroutines();

        hasFallen = false;
        isFalling = false;

        if (impactAudioSource != null)
            impactAudioSource.Stop();

        if (spotlight != null)
        {
            spotlight.position = startPosition;
            spotlight.rotation = startRotation;
        }
    }

    [ContextMenu("Test Fall")]
    private void TestFall()
    {
        DropSpotlight();
    }

    [ContextMenu("Reset Fall")]
    private void TestResetFall()
    {
        ResetFall();
    }
}