【进阶实战】沙巴克报名倒计时：个人定时器的封装与清理

local function signUp(actor)
    actor = getplayerbyname(actor)
    if hastimer(actor, 12) then
        sendmsg(actor, 1, "报名确认已在倒计时中，请勿重复操作。")
        return
    end
    if not takeitem(actor, "金条", 5) then
        sendmsg(actor, 1, "报名需要 5 根金条。")
        return
    end
    setplayvar(actor, "HUMAN", "WarSign", os.time(), 1)
    setontimer(actor, 12, 1, 30, 1)
    sendmsg(actor, 1, "报名已受理，30 秒后生效，期间可撤销。")
end

local function ontimer12(actor)
    actor = getplayerbyname(actor)
    local signAt = tonumber(getplayvar(actor, "HUMAN", "WarSign")) or 0
    local left = signAt + 30 - os.time()
    if left > 0 then
        sendcentermsg(actor, 255, 215, "沙巴克报名生效倒计时：" .. left .. " 秒", 0, 1)
        return
    end
    setofftimer(actor, 12)
    sendmsg(actor, 1, "报名正式生效，攻城日请提前 10 分钟到场。")
end