package tun

import "net"

// Option defines a TUN device modifier option.
type Option func(tun *TUN) error

// Address sets the local address and subnet for an interface.
// On MacOS devices use this function to set the Src Address
// for an interface and use DestAddress to set the destination ip.
func Address(address string) Option {
	return func(tun *TUN) error {
		return tun.setAddress(address)
	}
}

// MTU sets the Maximum Transmission Unit size for an interface.
func MTU(mtu int) Option {
	return func(tun *TUN) error {
		return tun.setMTU(mtu)
	}
}

// DestAddress sets the destination address for a point-to-point interface.
// Only use this option on MacOS devices.
func DestAddress(address string) Option {
	return func(tun *TUN) error {
		return tun.setDestAddress(address)
	}
}

// Route adds an entry to the system route table
func Route(dest net.IPNet) Option {
	return func(tun *TUN) error {
		return tun.addRoute(dest)
	}
}

// RemoveRoute removes an entry from the system route table
func RemoveRoute(dest net.IPNet) Option {
	return func(tun *TUN) error {
		return tun.delRoute(dest)
	}
}