帮会抽奖：每周限次的帮会奖池

local function drawLottery(actor)
    local joinT = getplayvar(actor, "joinGuildT") or 0
    if os.time() - joinT < 7 * 86400 then
        sendmsg(actor, 1, "入帮未满 7 天，暂不可抽")
        return
    end
    local wk = os.date("%G%V")
    local n = (getplayvar(actor, "draw" .. wk) or 0)
    if n >= 3 then
        sendmsg(actor, 1, "本周 3 次已抽完")
        return
    end
    setplayvar(actor, "draw" .. wk, n + 1)
    local id = math.random(1, 100)
    local item = id <= 5 and 7301
        or id <= 30 and 7302 or 7303
    giveitem(actor, item, 1)
    if id <= 5 then
        sendcentermsg(0, getplayvar(actor, "NAME")
            .. " 抽中大奖")
    end
end

local function queryDraw(actor)
    local wk = os.date("%G%V")
    local used = getplayvar(actor, "draw" .. wk) or 0
    sendmsg(actor, 1, "本周剩余 " .. 3 - used .. " 次抽奖")
end