local Emitter = {
    EventHandlers = {}
}

-- 注册事件监听
function Emitter.OnEvent(eventName, handler)
    if not eventName or type(handler) ~= "function" then
        print("[EventSystem] Invalid event registration")
        return
    end

    if not Emitter.EventHandlers[eventName] then
        Emitter.EventHandlers[eventName] = {}
    end

    table.insert(Emitter.EventHandlers[eventName], handler)
    return handler -- 返回handler用于注销
end

-- 触发事件
function Emitter.EmitEvent(eventName, ...)
    local handlers = Emitter.EventHandlers[eventName]
    if not handlers then return end

    print("[EventSystem] Emitting event: " .. eventName)
    for i = #handlers, 1, -1 do -- 倒序遍历允许在回调中移除事件
        local success, err = pcall(handlers[i], ...)
        if not success then
            print("[EventSystem] Error in handler: " .. tostring(err))
        end
    end
end

-- 注销事件
function Emitter.OffEvent(eventName, handler)
    local handlers = Emitter.EventHandlers[eventName]
    if not handlers then return end

    for i = #handlers, 1, -1 do
        if handlers[i] == handler then
            table.remove(handlers, i)
        end
    end

    if #handlers == 0 then
        Emitter.EventHandlers[eventName] = nil
    end
end




return Emitter