回归礼包：三十天未登录的回归奖励

local function claimBack(actor)
    local gap = os.time()
        - (getplayvar(actor, "lastLoginT") or 0)
    if gap < 30 * 86400 then
        sendmsg(actor, 1, "未达 30 天，暂非回归")
        return
    end
    if (getplayvar(actor, "backYear") or 0)
        == tonumber(os.date("%Y")) then
        sendmsg(actor, 1, "本年度回归奖已领过")
        return
    end
    local lv = getplayvar(actor, "LEVEL") or 0
    local tier = lv >= 60 and 7403
        or lv >= 30 and 7402 or 7401
    giveitem(actor, tier, 1)
    setplayvar(actor, "backYear", tonumber(os.date("%Y")))
end

local function queryBack(actor)
    local lv = getplayvar(actor, "LEVEL") or 0
    sendmsg(actor, 1, "回归可领档位："
        .. (lv >= 60 and 7403 or lv >= 30 and 7402 or 7401))
end