帮会祭司：祝福轮换的周期施放

local BLESS = {"攻", "防", "血"}
local function castBlessing(actor, guild)
    local wk = tonumber(os.date("%G%V"))
    local kind = BLESS[wk % 3 + 1]
    setsysvarex("bless_" .. guild, kind)
    setsysvarex("blessEnd_" .. guild,
        os.time() + 7 * 86400)
    sendcentermsg(0, guild .. " 本周祭司祝福："
        .. kind .. " 属性强化")
end

local function queryBless(actor, guild)
    local kind = getsysvar("bless_" .. guild) or "无"
    local left = math.floor(
        ((getsysvar("blessEnd_" .. guild) or 0)
        - os.time()) / 86400)
    sendmsg(actor, 1, "当前祝福 " .. kind
        .. "，剩余 " .. left .. " 天")
end