【数据存储】师门积分每周限购：限购状态的持久化设计

local WEEK_LIMIT = 2
local function weekNo()
    return os.date("%Y") .. math.floor((os.time() - 1785830400) / 604800)
end
local function buyWeekly(actor, item)
    local player = class(actor)
    local key = "SM_W_" .. weekNo() .. "_" .. item
    local cnt = tonumber(getplayvar(actor, 2, key) or "0")
    if cnt >= WEEK_LIMIT then
        sendmsg(actor, 0, "本周限购" .. WEEK_LIMIT .. "件已用完")
        return
    end
    setplayvar(actor, "HUMAN", key, cnt + 1, 1)
    giveitem(actor, item, 1)
    sendmsg(actor, 0, "兑换成功，本周剩余" .. WEEK_LIMIT - cnt - 1 .. "件")
end

local function weeklyLeft(actor, item)
    local player = class(actor)
    local key = "SM_W_" .. weekNo() .. "_" .. item
    local cnt = tonumber(getplayvar(actor, 2, key) or "0")
    return WEEK_LIMIT - cnt
end