EventSystem = EventSystem or {}

EventSystem.Events = {}

--添加监听
function EventSystem:AddListener(EventType, Func, Object)
    if EventType == nil or Func == nil then
        UE.LogError("EventSystem:AddListener EventType or Func is nil!")
        return
    end

    local FuncData = {}
    FuncData.Object = Object
    FuncData.Func = Func

    if EventSystem.Events[EventType]==nil then
        local NewEventFuncs={}
        table.insert(NewEventFuncs ,FuncData)
        EventSystem.Events[EventType] = NewEventFuncs
        UE.Log("EventSystem:AddListener EventType[%s], Func[%s]", tostring(EventType), tostring(Func))
    else
        table.insert(EventSystem.Events[EventType], FuncData)
        UE.Log("EventSystem:AddListener EventType[%s], Func[%s]", tostring(EventType), tostring(Func))
    end
end

--移除监听
function EventSystem:RemoveListener(EventType, Func, Object)
    if EventType == nil or Func == nil then
        UE.LogError("EventSystem:RemoveListener EventType or Func is nil!")
        return
    end
    local EventFuncs = EventSystem.Events[EventType]
    if EventFuncs ~= nil then
        for i, FuncData in pairs(EventFuncs) do
            if FuncData.Func == Func and FuncData.Object == Object then
                local result = table.removeKey(EventFuncs, i)
                UE.Log("EventSystem:RemoveListener EventType[%s], Func[%s]", tostring(EventType), tostring(result))
                break
            end
        end
    else
        UE.Log("EventSystem:RemoveListener EventFuncs[%s] is nil!", tostring(EventType))
    end
end

--派发事件
function EventSystem:SendEvent(EventType, ...)
    UE.Log("EventSystem:SendEvent self[%s], EventType[%s]", tostring(self), tostring(EventType))
    if EventType ~= nil then
        local EventFuncs = EventSystem.Events[EventType];
        if EventFuncs ~= nil then
            for i, FuncData in pairs(EventFuncs) do
                if FuncData.Object ~= nil then
                    FuncData.Func(FuncData.Object, ...)
                else
                    FuncData.Func(...)
                end
            end
        else
            UE.Log("EventSystem:SendEvent EventFuncs[%s] is nil!", tostring(EventType))
        end
    end
end

--- SetTimer
---@param Obj UObject
---@param Fun fun()
---@param IntevalSeconds float
---@return TimerHandle
function EventSystem.SetTimer(Obj, Fun, IntevalSeconds)
    UE.Log("[Timer] 设置定时器 %s:%s", UE.GetPathName(Obj), tostring(Fun))
    local TimerDelegate = ObjectExtend.CreateDelegate(Obj, Fun, Obj)
    local Handle = KismetSystemLibrary.K2_SetTimerDelegateForLua(TimerDelegate, Obj, IntevalSeconds, false)
    local R = {}
    R.Object = Obj
    R.Handle = Handle
    return R
end

--- SetTimerLoop
---@param Obj UObject
---@param Fun fun()
---@param IntevalSeconds float
---@return TimerHandle
function EventSystem.SetTimerLoop(Obj, Fun, IntevalSeconds)
    local TimerDelegate = ObjectExtend.CreateDelegate(Obj, Fun, Obj);
    local Handle = KismetSystemLibrary.K2_SetTimerDelegateForLua(TimerDelegate, Obj, IntevalSeconds, true);
    local R = {};
    R.Object = Obj;
    R.Handle = Handle;
    
    UE.Log("[Timer] 设置循环定时器 %s:%s H:%s", UE.GetPathName(Obj), tostring(Fun), tostring(R));
    return R;
end

--- StopTimer
---@param HandlePair TimerHandle
function EventSystem.StopTimer(HandlePair)    
    if HandlePair == nil then
        assert(false, "[UGC][EventSystem.StopTimer] HandlePair is nil")
    else
        UE.Log("[Timer] 停止定时器 Object:%s Handle:%s", UE.GetPathName(HandlePair.Object), tostring(HandlePair.Handle));        
        KismetSystemLibrary.K2_ClearTimerHandle(HandlePair.Object, HandlePair.Handle);
    end
end

return EventSystem