【后端接口】装备租借：押金托管与到期归还

---装备租借：押金托管与计时
function Rent.pledge(actor, ownerName, makeIndex, days)
    local player = class(actor)
    if not player then return false end
    local owner = getplayerbyname(ownerName)
    if not owner then return false end
    local value = Rent.evaluate(makeIndex)
    local deposit = math.floor(value * 1.5)
    if not checkitemw(actor, "金币", deposit) then
        sendmsg(actor, 1, "押金不足，需 " .. deposit .. " 金币")
        return false
    end
    takeitem(actor, "金币", deposit, 0, "租借押金")
    delitembymakeindex(owner, makeIndex)
    giveitem(actor, Rent.itemName(makeIndex), 1)
    -- 租借凭据：双方、押金、到期时刻
    Rent.book(actor, ownerName, makeIndex, deposit,
        os.time() + days * 86400)
    sendmsg(actor, 1, "租借成功，" .. days .. " 天内归还")
    return true
end

---到期检查：逾期装备的冻结与提醒
setontimerex(116, 3600)
function Rent.expireCheck()
    for _, r in ipairs(Rent.active) do
        if os.time() > r.expireAt and not r.warned then
            r.warned = true
            sendmsg(r.renter, 1, "租借已到期，请 24 小时内归还")
        end
    end
end

---归还：装备退回物主，押金扣租金后退还
function Rent.giveBack(actor, makeIndex)
    local player = class(actor)
    if not player then return false end
    local r = Rent.ticketOf(makeIndex)
    if not r then return false end
    local days = math.max(1, math.ceil(
        (os.time() - r.startAt) / 86400))
    local fee = math.floor(r.value * 0.05) * days
    delitembymakeindex(actor, makeIndex)
    giveitem(r.owner, Rent.itemName(makeIndex), 1)
    giveitem(actor, "金币", r.deposit - fee)
    giveitem(r.owner, "金币", fee)
    Rent.clear(makeIndex)
    sendmsg(actor, 1, "归还完成，押金扣除租金 " .. fee)
    return true
end