堆雪人：材料集齐的限时堆筑

local function pickMat(actor, mat)
    setplayvar(actor, "mat_" .. mat,
        (getplayvar(actor, "mat_" .. mat) or 0) + 1)
    sendmsg(actor, 1, mat .. " +1")
end

local function buildSnowman(actor)
    local snow = getplayvar(actor, "mat_雪团") or 0
    local carrot = getplayvar(actor, "mat_胡萝卜") or 0
    local coal = getplayvar(actor, "mat_煤块") or 0
    if snow < 2 or carrot < 1 or coal < 1 then
        sendmsg(actor, 1, "材料不足：雪团2、胡萝卜1、煤块1")
        return
    end
    setplayvar(actor, "mat_雪团", snow - 2)
    setplayvar(actor, "mat_胡萝卜", carrot - 1)
    setplayvar(actor, "mat_煤块", coal - 1)
    setplayvar(actor, "snowman", 1)
    sendmsg(actor, 1, "雪人堆成，展示 24 小时")
end