//--------------------------------------------------------
//    [Author]:           玩个游戏
//    [  Date ]:           Saturday, October 07, 2017
//--------------------------------------------------------

using System;
using System.Collections;
using System.Collections.Generic;
using Cysharp.Threading.Tasks;
using UnityEngine;
using UnityEngine.UI;

public class ScrollTipWin : UIBase
{
    [SerializeField] RectTransform content;
    [SerializeField] RectTransform mask;

    [SerializeField, Header("显示条数")]
    int tipDisplayCnt = 3;
    [SerializeField, Header("每次滚动的距离")]
    float m_TipDistance = 50.0f;
    [SerializeField, Header("提示预制体高度")]
    float m_TipHeight = 40.0f;
    [SerializeField, Header("显示时间")]
    float m_TipShowTime = 1.0f;
    [SerializeField, Header("移动时间")]
    float m_TipMoveTime = 0.2f;
    [SerializeField, Header("隐藏时间")]
    float m_TipHideTime = 0.5f;
    
    bool isLoopRunning = false;

    protected override void InitComponent()
    {

    }

    protected override void OnClose()
    {

    }

    protected override void OnOpen()
    {

    }

    protected override void OnPreClose()
    {
        ScrollTip.OnTipReceiveEvent -= OnAddTipEvent;
        ScrollTip.ReleaseAll();
    }

    protected override void OnPreOpen()
    {
        ScrollTip.tipMoveTime = m_TipMoveTime;
        ScrollTip.OnTipReceiveEvent += OnAddTipEvent;
        mask.sizeDelta = mask.sizeDelta.SetY(tipDisplayCnt * m_TipHeight + (tipDisplayCnt - 1) * (m_TipDistance - m_TipHeight) + 10);
        
        // 如果有待处理的提示，立即启动循环
        if (ScrollTip.m_Hints.Count > 0)
        {
            LoopTipReceiveEvent().Forget();
        }
    }

    async UniTask LoopTipReceiveEvent()
    {
        if (isLoopRunning) return; // 防止重复启动
        
        isLoopRunning = true;
        try
        {
            while (ScrollTip.m_Hints.Count > 0)
            {
                OnTipReceiveEvent().Forget();
                await UniTask.Delay(100);
                if (this == null) return; // destroyed during await
            }
        }
        finally
        {
            isLoopRunning = false;
        }
    }

    void OnAddTipEvent()
    {
        // 只有在没有循环运行时才启动新的循环
        if (!isLoopRunning)
        {
            LoopTipReceiveEvent().Forget();
        }
    }

    private async UniTask OnTipReceiveEvent()
    {
        if (ScrollTip.m_Hints.Count > 0 && IsCanAdd())
        {
            if (ScrollTip.m_ActiveTips.Count >= tipDisplayCnt)
            {
                ScrollTip.Release(ScrollTip.m_ActiveTips[0], false);
                ScrollTip.tipMoveTime = Time.deltaTime;
            }
            else
            {
                ScrollTip.tipMoveTime = m_TipMoveTime;
            }
            // for (int i = 0; i < ScrollTip.m_ActiveTips.Count; i++)
            // {
            //     ScrollTip.m_ActiveTips[i].Play(ScrollTip.ScrollTipState.Move);
            // }
            ScrollTipDetail tipDetail = await ScrollTip.Request();
            if (tipDetail != null)
            {
                // 首次登录时 pool 为 null，Request() 异步加载预制体耗时 >100ms。
                // LoopTipReceiveEvent 每 100ms 重入，可能已有另一次调用先消耗了 m_Hints[0]。
                // 若 await 返回时 m_Hints 已空，必须将 tipDetail 归还池，否则它会被插入 Canvas 但
                // 永远不会播放动画，导致提示条卡在屏幕上（第一次登录复现的根因）。
                if (ScrollTip.m_Hints.Count == 0)
                {
                    ScrollTip.Release(tipDetail, false);
                    return;
                }
                tipDetail.SetTipConfig(m_TipShowTime, m_TipHideTime, m_TipDistance);
                ScrollTip.m_ActiveTips.Add(tipDetail);
                var rt = tipDetail.transform;
                rt.SetParent(content.parent);
                rt.localScale = Vector3.one;
                rt.localPosition = content.localPosition;
                var _hint = ScrollTip.m_Hints[0];
                ScrollTip.m_Hints.RemoveAt(0);
                tipDetail.ShowTip(_hint);
                tipDetail.Play(ScrollTip.ScrollTipState.Move);
            }
        }
    }

    private bool IsCanAdd()
    {
        // for (int i = 0; i < ScrollTip.m_ActiveTips.Count; i++)
        // {
        //     if (ScrollTip.m_ActiveTips[i].presentState == ScrollTip.ScrollTipState.Move)
        //     {
        //         return false;
        //     }
        // }
        return true;
    }
}