using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class TextScrollView : MonoBehaviour
{
    [SerializeField]
    private float m_MaxHeight = 245;

    [SerializeField]
    private float m_HeightSpeed = 10;

    private bool isScroll;

    private float m_NowHeight = 0;
    private float m_MaxScrollHeight = 0;
    private void OnEnable()
    {
        isScroll = false;
        m_NowHeight = 0;
        SetHeight();
        StopCoroutine("DeleyJudgeHeight");
        StartCoroutine("DeleyJudgeHeight");
    }

    private IEnumerator DeleyJudgeHeight()
    {
        yield return new WaitForSeconds(1);
        Vector2 size = GetComponent<RectTransform>().sizeDelta;
        m_MaxScrollHeight = (size.y - m_MaxHeight);
        if (size.y >= m_MaxHeight)
        {
            isScroll = true;
        }
    }

    // Update is called once per frame
    void Update()
    {
        if(isScroll)
        {
            m_NowHeight += Time.deltaTime * m_HeightSpeed;
            if(m_NowHeight > (m_MaxScrollHeight - (m_NowHeight / 2.0f)))
            {
                isScroll = false;
                m_NowHeight = 0;
            }
            SetHeight();
        }
    }

    private void SetHeight()
    {
        GetComponent<RectTransform>().anchoredPosition = new Vector3(0, m_NowHeight,0);
    }
}