using System.Collections;
using UnityEngine;

public class FallingStalactite : MonoBehaviour
{
    [Header("References")]
    [SerializeField] private Rigidbody rb;
    [SerializeField] private Collider damageCollider;
    [SerializeField] private DamageObstacle damageObstacle;

    [Header("Fall Settings")]
    [SerializeField] private float fallDelay = 0.0f;

    [Tooltip("떨어질 때 아래 방향으로 추가 속도를 줍니다.")]
    [SerializeField] private float initialDownVelocity = 0f;

    [Tooltip("떨어질 때 약간 회전시키고 싶으면 값을 넣습니다.")]
    [SerializeField] private Vector3 initialAngularVelocity = new Vector3(0f, 0f, 0f);

    [Header("Damage")]
    [SerializeField] private int damage = 10;

    [Tooltip("떨어지기 전에는 데미지를 끄고, 떨어질 때 켭니다.")]
    [SerializeField] private bool damageOnlyWhileFalling = true;

    [Header("Reset Option")]
    [SerializeField] private bool resetAfterFall = true;

    [Tooltip("떨어진 뒤 몇 초 후 원래 위치로 돌아갈지 설정합니다.")]
    [SerializeField] private float resetDelay = 4.0f;

    [Tooltip("리셋할 때 종유석을 다시 숨기지 않고 원위치에 고정합니다.")]
    [SerializeField] private bool readyAgainAfterReset = true;

    [Header("Debug")]
    [SerializeField] private bool showDebugLog = true;

    private Vector3 startPosition;
    private Quaternion startRotation;
    private bool hasFallen;
    private Coroutine fallRoutine;

    public bool HasFallen => hasFallen;

    private void Awake()
    {
        ResolveReferences();

        startPosition = transform.position;
        startRotation = transform.rotation;

        PrepareStalactite();
    }

    private void ResolveReferences()
    {
        if (rb == null)
            rb = GetComponent<Rigidbody>();

        if (damageCollider == null)
            damageCollider = GetComponent<Collider>();

        if (damageObstacle == null)
            damageObstacle = GetComponent<DamageObstacle>();
    }

    private void PrepareStalactite()
    {
        if (rb != null)
        {
            rb.useGravity = false;
            rb.isKinematic = true;
            rb.linearVelocity = Vector3.zero;
            rb.angularVelocity = Vector3.zero;
        }

        if (damageObstacle != null)
        {
            damageObstacle.SetDamage(damage);
            damageObstacle.SetCanDamage(!damageOnlyWhileFalling);
        }

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

        hasFallen = false;
    }

    public void TriggerFall()
    {
        if (hasFallen)
            return;

        if (fallRoutine != null)
            StopCoroutine(fallRoutine);

        fallRoutine = StartCoroutine(FallRoutine());
    }

    private IEnumerator FallRoutine()
    {
        hasFallen = true;

        if (fallDelay > 0f)
            yield return new WaitForSeconds(fallDelay);

        if (damageObstacle != null)
        {
            damageObstacle.SetDamage(damage);
            damageObstacle.SetCanDamage(true);
        }

        if (rb != null)
        {
            rb.isKinematic = false;
            rb.useGravity = true;

            if (initialDownVelocity > 0f)
            {
                rb.linearVelocity = Vector3.down * initialDownVelocity;
            }

            rb.angularVelocity = initialAngularVelocity;
        }

        if (showDebugLog)
            Debug.Log($"[FallingStalactite] {name} 낙하 시작. 데미지 {damage}", this);

        if (resetAfterFall)
        {
            yield return new WaitForSeconds(resetDelay);
            ResetStalactite();
        }

        fallRoutine = null;
    }

    public void ResetStalactite()
    {
        if (rb != null)
        {
            rb.linearVelocity = Vector3.zero;
            rb.angularVelocity = Vector3.zero;
            rb.useGravity = false;
            rb.isKinematic = true;
        }

        transform.position = startPosition;
        transform.rotation = startRotation;

        if (damageObstacle != null)
        {
            damageObstacle.SetDamage(damage);
            damageObstacle.SetCanDamage(!damageOnlyWhileFalling);
        }

        if (readyAgainAfterReset)
        {
            hasFallen = false;
        }

        if (showDebugLog)
            Debug.Log($"[FallingStalactite] {name} 원위치 리셋", this);
    }
}