帮会料理：食材烹饪的限时增益

local RECIPE = {
    ["烤肉"] = {need = {["兽肉"] = 3},
        buff = "atk", mins = 30},
    ["炖汤"] = {need = {["清泉"] = 2, ["兽肉"] = 1},
        buff = "hp", mins = 30},
}
local function cook(actor, dish)
    local r = RECIPE[dish]
    if r == nil then
        sendmsg(actor, 1, "没有这道食谱")
        return
    end
    for mat, cnt in pairs(r.need) do
        if (getplayvar(actor, "mat_" .. mat) or 0) < cnt then
            sendmsg(actor, 1, "食材不足，缺 " .. mat)
            return
        end
    end
    for mat, cnt in pairs(r.need) do
        setplayvar(actor, "mat_" .. mat,
            getplayvar(actor, "mat_" .. mat) - cnt)
    end
    setplayvar(actor, "buff_" .. r.buff,
        os.time() + r.mins * 60)
    sendmsg(actor, 1, dish .. " 完成，增益 "
        .. r.mins .. " 分钟")
end

local function queryBuff(actor, buff)
    local endT = getplayvar(actor, "buff_" .. buff) or 0
    local left = math.max(
        math.floor((endT - os.time()) / 60), 0)
    sendmsg(actor, 1, "剩余 " .. left .. " 分钟")
end