using Framework;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using Framework.Condition;
using static Framework.EventManager;

public abstract class RedPointNode : IEnumerable
{
    private bool _isDisposed;

    private EventName[] _eventsToRegister;

    private int _reactionID;

    protected List<RedPointNode> _children = new();

    //该红点节点需要注册的事件，当事件发生时刷新数量
    protected abstract EventName[] eventsToRegister { get; }

    //数目要override，去算各自系统对应的消息数
    protected abstract int GetCount();
    public int MessageCount { get; private set; }
    public int ID { get; private set; }
    public bool IsDynamic => ID > RedPointManager.RED_POINT_NODE_DYNAMIC_ID_START;
    public RedPointNode parent { get; set; }
    public bool Valid => !_isDisposed;

    public object param { get; set; }

    protected RedPointNode(int id)
    {
        ID = id;
    }

    public void AddChild(RedPointNode child)
    {
        _children.Add(child);
    }

    public void RemoveChild(RedPointNode child)
    {
        _children.Remove(child);
    }

    public void Init()
    {
        _eventsToRegister = eventsToRegister;
        RegisterSignal();
        RefreshCount();
    }

    public void Dispose()
    {
        if (!_isDisposed)
        {
            UnRegisterSignal();
            _children = null;
            parent = null;
            _isDisposed = true;
            SendChange();
        }
    }

    private void RegisterSignal()
    {
        if (_eventsToRegister != null)
            _reactionID = ConditionReactor.Instance.AddReaction(Refresh, _eventsToRegister.ToList(), OnRefreshFinish);
    }

    private void UnRegisterSignal()
    {
        if (_eventsToRegister != null)
            ConditionReactor.Instance.RemoveReaction(_reactionID);
    }

    private bool Refresh(object arg = null)
    {
        var oldCount = MessageCount;
        MessageCount = GetCount();
        return MessageCount != oldCount;
    }

    private void OnRefreshFinish(bool result, object callBackParam, int id)
    {
        if (result)
        {
            SendChange();
        }
    }

    public void RefreshCount()
    {
        if (Refresh())
        {
            SendChange();
        }
    }

    private void SendChange()
    {
        EventManager.Instance.Send(EventName.RedPointDataChange, this);
        if (parent != null)
        {
            parent.RefreshCount();
        }
    }

    public IEnumerator GetEnumerator()
    {
        for (int i = _children.Count - 1; i >= 0; i--)
        {
            yield return _children[i];
        }
    }
}