【后端接口】行会商店：贡献兑换行会专属道具接口

-- 行会商店：兑换接口
local player = class(actor)
local GOODS = {
    [1] = {name = "行会传送卷", cost = 200, weekly = 2},
    [2] = {name = "限定披风", cost = 1500, weekly = 1},
}
local function exchange(player, goodsId)
    local g = GOODS[goodsId]
    if g == nil then
        sendmsg(player, 1, 0, "商品不存在。")
        return
    end
    local contrib = tonumber(getplayvar(player, "HUMAN", "SectContrib") or 0)
    if contrib < g.cost then
        sendmsg(player, 1, 0, "贡献不足，还差 " .. g.cost - contrib .. " 点。")
        return
    end
    local bought = tonumber(getplayvar(player, "HUMAN", "ShopWeek_" .. goodsId) or 0)
    if bought >= g.weekly then
        sendmsg(player, 1, 0, "本周限购已用完（" .. g.weekly .. " 件）。")
        return
    end
    setplayvar(player, "HUMAN", "SectContrib", contrib - g.cost, true)
    setplayvar(player, "HUMAN", "ShopWeek_" .. goodsId, bought + 1, true)
    giveitem(player, g.name, 1)
    sendmsg(player, 1, 0, "兑换成功：" .. g.name .. " x1。")
end

-- 行会商店：周重置与补货
local player = class(actor)
local function weeklyReset(player, guildLv)
    for goodsId, g in pairs(GOODS) do
        setplayvar(player, "HUMAN", "ShopWeek_" .. goodsId, 0, true)
    end
    local stockCap = 50 + guildLv * 20
    setsysvarex("GuildStockCap", stockCap, true)
    sendmsg(player, 1, 0, "商店周限购已重置，本周库存上限 " .. stockCap .. " 件。")
end