using System;
using UnityEngine;
using UnityEngine.UI;

public class SliderBase : MonoBehaviour
{
    [Header("슬라이더")]
    public Slider m_slider;         // 즉시 반영 (현재 HP)
    public Slider m_middleslider;   // 지연 반영 (잔상)

    [Header("설정값")]
    public float followDelay = 0.3f; // 잔상 딜레이 (초)
    public float followSpeed = 3f;   // 따라가는 속도

    float targetValue;
    float delayTimer;
    private float velocity; // SmoothDamp용 내부 속도 변수
    bool isDecreasing; // 감소 중인지 판별
    bool isFinished;   // 완료 콜백 중복 방지

    Action<bool> act_GageEnd;

#if UNITY_EDITOR
    private void Reset()
    {
        m_slider = GetComponent<Slider>();
        for (int i = 0; i < transform.childCount; i++)
        {
            var sd = transform.GetChild(i).GetComponent<Slider>();
            if (sd != null)
            {
                m_middleslider = sd;
                break;
            }
        }

        m_slider.fillRect.GetComponent<Image>().type = Image.Type.Filled;
        m_slider.fillRect.GetComponent<Image>().fillMethod = Image.FillMethod.Horizontal;
        m_middleslider.fillRect.GetComponent<Image>().type = Image.Type.Filled;
        m_middleslider.fillRect.GetComponent<Image>().fillMethod = Image.FillMethod.Horizontal;
    }
#endif

    public void Set(float v)
    {
        m_slider.value = m_middleslider.value = DSUtil.Get_SliderValue(v);
        targetValue = Mathf.Min(1f, v);
        isFinished = true; // 초기 세팅은 즉시 완료 상태로 간주
    }

    public void Set_Next(float v, Action<bool> actgageend = null)
    {
        act_GageEnd = actgageend;

        isDecreasing = v < targetValue; // 이전 targetValue와 비교
        targetValue = Mathf.Min(1f, v);
        delayTimer = 0f;
        isFinished = false;

        if (isDecreasing)
            m_slider.value = DSUtil.Get_SliderValue(v); // 즉시 반영
        else
            m_middleslider.value = DSUtil.Get_SliderValue(v); // 즉시 반영
    }

    private void Update()
    {
        delayTimer += Time.deltaTime;

        if (isDecreasing)
        {
            if (delayTimer >= followDelay)
            {
                if (delayTimer >= followDelay)
                {
                    m_middleslider.value = DSUtil.Get_SliderValue(Mathf.Lerp(
                        m_middleslider.value, targetValue, Time.deltaTime * followSpeed
                    ));

                    // 목표값에 충분히 근접하면 종료 처리
                    if (!isFinished && Mathf.Abs(m_middleslider.value - targetValue) < 0.001f)
                    {
                        m_middleslider.value = DSUtil.Get_SliderValue(targetValue);
                        isFinished = true;
                        act_GageEnd?.Invoke(targetValue >= 1f);
                    }
                }
            }
        }
        else
        {
            // SmoothDamp으로 자연스러운 상승
            m_slider.value = DSUtil.Get_SliderValue(
                Mathf.SmoothDamp(m_slider.value, targetValue, ref velocity, 0.225f)
            );

            if (!isFinished && Mathf.Abs(m_slider.value - targetValue) < 0.001f)
            {
                m_slider.value = DSUtil.Get_SliderValue(targetValue);
                isFinished = true;
                act_GageEnd?.Invoke(targetValue >= 1f);
            }
        }
    }
}