using System;
using System.Collections.Generic;

namespace Game
{
    public delegate void EventHandler<TParam>(TParam eventParam);
    public delegate void EventVoidHandler();
    public class EventManager : ManagerBase<EventManager>
    {
        private Dictionary<EEvent, Delegate> _mEventDict;
        public EventManager() { }
        public override void OnCreate()
        {
            _mEventDict = new Dictionary<EEvent, Delegate>();
        }
        public override void Update()
        {
        }
        public override void OnDestroy()
        {
        }
        public void AddEvent<TParam>(EEvent eventType, EventHandler<TParam> callback)
        {
            if (_mEventDict.TryGetValue(eventType, out var handler))
            {
                _mEventDict[eventType] = (EventHandler<TParam>)handler + callback;
            }
            else
            {
                _mEventDict[eventType] = callback;
            }
        }
        public void RemoveEvent<TParam>(EEvent eventType, EventHandler<TParam> callback)
        {
            if (_mEventDict.TryGetValue(eventType, out var handler))
            {
                _mEventDict[eventType] = (EventHandler<TParam>)handler - callback;
            }
        }
        public void SendEvent<TParam>(EEvent eventType, TParam param)
        {
            if (_mEventDict.TryGetValue(eventType, out var handler))
            {
                if (handler == null)
                {
                    return;
                }
                foreach (var callback in handler.GetInvocationList())
                {
                    ((EventHandler<TParam>)callback)(param);
                }
            }
        }

        public void AddEvent(EEvent eventType, EventVoidHandler callback)
        {
            if (_mEventDict.TryGetValue(eventType, out var handler))
            {
                _mEventDict[eventType] = (EventVoidHandler)handler + callback;
            }
            else
            {
                _mEventDict[eventType] = callback;
            }
        }
        public void RemoveEvent(EEvent eventType, EventVoidHandler callback)
        {
            if (_mEventDict.TryGetValue(eventType, out var handler))
            {
                _mEventDict[eventType] = (EventVoidHandler)handler - callback;
            }
        }
        public void SendEvent(EEvent eventType)
        {
            if (_mEventDict.TryGetValue(eventType, out var handler))
            {
                if (handler == null)
                {
                    return;
                }
                foreach (var callback in handler.GetInvocationList())
                {
                    ((EventVoidHandler)callback)();
                }
            }
        }
    }
}