【进阶实战】限时商城的上架时间控制：时间窗校验封装

local shopGoods = {
    [1] = { name = "祝福油礼包", start = 1790167200, over = 1790210400, limit = 3, item = "祝福油", num = 10 },
}
local function canBuy(actor, goodsId)
    actor = getplayerbyname(actor)
    local g = shopGoods[goodsId]
    if g == nil then
        sendmsg(actor, 1, "商品不存在。")
        return false
    end
    local now = os.time()
    if now < g.start then
        sendmsg(actor, 1, "尚未开售，开售时间为周末 10 点。")
        return false
    end
    if now >= g.over then
        sendmsg(actor, 1, "本期已售罄下架，下期周末 10 点开售。")
        return false
    end
    local bought = tonumber(getplayvar(actor, "HUMAN", "ShopBuy_" .. goodsId)) or 0
    if bought >= g.limit then
        sendmsg(actor, 1, "本期限购 " .. g.limit .. " 件已购满。")
        return false
    end
    return true
end

local function buyGoods(actor, goodsId)
    actor = getplayerbyname(actor)
    if not canBuy(actor, goodsId) then
        return
    end
    local g = shopGoods[goodsId]
    giveitem(actor, g.item, g.num, 1, "限时商城购入")
    setplayvar(actor, "HUMAN", "ShopBuy_" .. goodsId,
        (tonumber(getplayvar(actor, "HUMAN", "ShopBuy_" .. goodsId)) or 0) + 1, 1)
    sendmsg(actor, 1, "购入 " .. g.item .. " 乘 " .. g.num .. "，本期还剩 " ..
        (g.limit - (tonumber(getplayvar(actor, "HUMAN", "ShopBuy_" .. goodsId)) or 0)) .. " 件可购。")
end