【进阶实战】首充发放校验：首充资格的判定与防重封装

local function grantFirstCharge(account, orderId, role)
    if getsysvar("FC_" .. account) ~= "" and
        getsysvar("FC_" .. account) ~= nil then
        print("账号已领过首充：" .. account)
        return false
    end
    if getsysvar("FCOrder_" .. orderId) ~= "" and
        getsysvar("FCOrder_" .. orderId) ~= nil then
        print("订单已处理：" .. orderId)
        return false
    end
    setsysvarex("FCOrder_" .. orderId, account, 1)
    setsysvarex("FC_" .. account, os.date("%Y%m%d"), 1)
    sendmail("#" .. role, 0, "首充大礼包",
        "感谢支持，请查收。", "裁决之杖,1")
    return true
end

local function canFirstCharge(account)
    local mark = getsysvar("FC_" .. account)
    return mark == "" or mark == nil
end