using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using System;
using Newtonsoft.Json.Linq;

/// <summary>
/// 2020.11.30 启用事件分发器
/// </summary>
public class EventDispatcher : MonoSingleton<EventDispatcher>
{
    static Dictionary<string, List<Action>> _EventListeners
            = new Dictionary<string, List<Action>>();

    /// <summary>
    /// 注册时间监听
    /// </summary>
    /// <param name="type"></param>
    /// <param name="listener"></param>
    public void AddEventListener(string type, Action ac)
    {
        if (!_EventListeners.ContainsKey(type))
        {
            _EventListeners.Add(type, new List<Action>());
        }
        _EventListeners[type].Add(ac);
    }

    /// <summary>
    /// 设置事件监听
    /// 注意：当次设定值会覆盖之前所有的注册事件而成为唯一事件
    /// </summary>
    /// <param name="type"></param>
    /// <param name="listener"></param>
    public void SetEventListener(string type, Action listener)
    {
        if (!_EventListeners.ContainsKey(type))
        {
            _EventListeners.Add(type, new List<Action>());
        }
        else
        {
            _EventListeners[type].Clear();
        }
        _EventListeners[type].Add(listener);
    }

    /// <summary>
    /// 移除事件监听
    /// </summary>
    /// <param name="type"></param>
    /// <param name="listener"></param>
    public void RemoveEventListener(string type, Action listener)
    {
        if (_EventListeners.ContainsKey(type))
        {
            _EventListeners[type].Remove(listener);
            if (_EventListeners[type].Count <= 0)
            {
                _EventListeners.Remove(type);
            }
        }
    }

    /// <summary>
    /// 清除特定类型事件监听
    /// </summary>
    /// <param name="type"></param>
    public void RemoveAllEventListener(string type)
    {
        if (_EventListeners.ContainsKey(type))
        {
            _EventListeners.Remove(type);
        }
    }

    /// <summary>
    /// 清除全部事件监听
    /// </summary>
    public void ClearAllEventListeners()
    {
        foreach (string type in _EventListeners.Keys)
        {
            _EventListeners[type].Clear();
        }
        _EventListeners.Clear();
    }

    /// <summary>
    /// 发送事件
    /// </summary>
    /// <param name="type"></param>
    /// <param name="_params"></param>
    public void DispatchEvent(string type, object _params1 = null, object _params2 = null)
    {
        if (_EventListeners.ContainsKey(type))
        {
            foreach (Action ac in _EventListeners[type])
            {
                if (ac != null)
                {
                    ac();
                }
            }
        }
    }
}