【进阶实战】钱庄存取：金币存储的利息设计封装

local function deposit(actor, amount)
    local carry = tonumber(getplayvar(actor, 1, "Gold")) or 0
    amount = math.min(amount, carry)
    if amount <= 0 then
        return
    end
    setplayvar(actor, 1, "Gold", carry - amount, 1)
    local bank = tonumber(getplayvar(actor, 1, "BankGold")) or 0
    setplayvar(actor, 1, "BankGold", bank + amount, 1)
    sendmsg(actor, 1, "存入 " .. amount
        .. "，账户余额 " .. (bank + amount) .. "。")
end

local RATE = 0.0001
local function dailyInterest(actor)
    local bank = tonumber(getplayvar(actor, 1, "BankGold")) or 0
    local interest = math.floor(bank * RATE)
    if interest > 0 then
        setplayvar(actor, 1, "BankGold", bank + interest, 1)
        sendmsg(actor, 1, "钱庄利息 " .. interest .. " 已入账。")
    end
end