using System.Collections;
using System.Threading;
using System.Threading.Tasks;
using Unity.VisualScripting;
using Unity.VisualScripting.Antlr3.Runtime;
using UnityEngine;
using UnityEngine.SceneManagement;

public class ItemEffectManager : MonoBehaviour
{
    public void OnSceneLoaded(Scene scene, LoadSceneMode mode)
    {

    }

    public void ItemUse(ItemInstance item)
    {
        switch(item.Data.ItemEffectType)
        {
            case ItemEffectType.RECOVERY_HP:
                {
                    RecoveryHPHealthEffect(GameManager.Instance.Level.CurrentCharacter.GetComponent<Health>(), item.Data.RecoveryHP, item.Data.ItemEffectVisual);
                }
                break;
            case ItemEffectType.INTERVAL_DAMAGE:
                {
                    IntervalDamageHealthEffect(GameManager.Instance.Level.CurrentCharacter.GetComponent<Health>(), item.Data.IntervalDamage, item.Data.IntervalDamageTime, item.Data.ItemEffectVisual);
                }
                break;
        }
    }

    public void RecoveryHPHealthEffect(Health health,float recoveryHP,GameObject itemEffectVisual)
    {
        PlayerHealth playerHealth = health as PlayerHealth;
        if (playerHealth != null)
        {
            GameObject fx_Visual = Instantiate(itemEffectVisual, playerHealth.transform); // health의 자식으로 이펙트 생성
            fx_Visual.transform.localPosition = new Vector3(0, 1.5f, 0);
            playerHealth.ChangeHP(Mathf.Clamp(playerHealth.CurrentHP + Mathf.FloorToInt(recoveryHP), 0, playerHealth.Pstat.MaxHp)); //소수점 전부 버림
        }


    }

    public void IntervalDamageHealthEffect(Health health,float damage,float time,GameObject itemEffectVisual)
    {
        IntervalDamage(health, damage,time, itemEffectVisual);
    }

    //일정 시간 동안 틱대미지 일으키는 함수
    public async void IntervalDamage(Health health, float damage,float time, GameObject itemEffectVisual)
    {
        // 유니티 오브젝트 자체의 CancellationToken 가져오기 (오브젝트 파괴 시 자동 취소)
        CancellationToken token = health.destroyCancellationToken;

        GameObject fx_Visual = Instantiate(itemEffectVisual, health.transform); // health의 자식으로 이펙트 생성
        fx_Visual.transform.localPosition = new Vector3(0, 1.5f, 0);
        
        float tickDamage = damage / time;

        try
        {
            while (time > 0)
            {
                health.ChangeHP(health.CurrentHP - Mathf.FloorToInt(tickDamage)); //소수점 전부 버림
                if (health.CurrentHP <= 0) break;
                time--;
                await Task.Delay(1000, token);
            }
        }
        catch (System.OperationCanceledException)
        {
            Debug.Log("데미지 루프가 취소됨");
        }
        finally
        {
            // 정상 종료되든, 취소되든(Exception) 이펙트는 확실히 제거
            if (fx_Visual != null) Destroy(fx_Visual);
        }
    }
}