【进阶实战】寄售议价：买卖双方的出价沟通封装

local function makeOffer(actor, orderId, price)
    actor = getplayerbyname(actor)
    local rec = tostring(getsysvar("Sell_" .. orderId) or "")
    if rec == "" or rec == "0" then
        sendmsg(actor, 1, "订单不存在。")
        return
    end
    local state = string.match(rec, "^[^|]+|([^|]+)")
    if state ~= "open" then
        sendmsg(actor, 1, "订单当前不可议价。")
        return
    end
    setsysvarex("Offer_" .. orderId, tostring(actor) .. "|" .. price .. "|open", 1)
    sendmsg(nil, 1, "订单[" .. orderId .. "]收到新出价 " .. price .. " 金币。")
end

local function answerOffer(actor, orderId, action, newPrice)
    actor = getplayerbyname(actor)
    local rec = tostring(getsysvar("Sell_" .. orderId) or "")
    if rec == "" or rec == "0" then
        sendmsg(actor, 1, "订单不存在。")
        return
    end
    if action == "accept" then
        local price = tonumber(string.match(rec, "^[^|]+|(%d+)")) or 0
        sendmsg(nil, 1, "订单[" .. orderId .. "]以 " .. price .. " 金币成交。")
        setsysvarex("Sell_" .. orderId, "", 1)
    elseif action == "counter" then
        setsysvarex("Offer_" .. orderId, tostring(actor) .. "|" .. newPrice .. "|counter", 1)
        sendmsg(nil, 1, "卖家还价至 " .. newPrice .. " 金币。")
    else
        setsysvarex("Offer_" .. orderId, "", 1)
        sendmsg(nil, 1, "议价已关闭。")
    end
end