package netlink

import (
	"net"
)

// Link represents a link device from netlink. Shared link attributes
// like name may be retrieved using the Attrs() method. Unique data
// can be retrieved by casting the object to the proper type.
type Link interface {
	Attrs() *LinkAttrs
	Type() string
}

// LinkAttrs represents data shared by most link types
type LinkAttrs struct {
	Index        int
	MTU          int
	Name         string
	HardwareAddr net.HardwareAddr
	Flags        net.Flags
	ParentIndex  int // index of the parent link device
	MasterIndex  int // must be the index of a bridge
}

// Device links cannot be created via netlink. These links
// are links created by udev like 'lo' and 'etho0'
type Device struct {
	LinkAttrs
}

func (device *Device) Attrs() *LinkAttrs {
	return &device.LinkAttrs
}

func (device *Device) Type() string {
	return "device"
}

// Dummy links are dummy ethernet devices
type Dummy struct {
	LinkAttrs
}

func (dummy *Dummy) Attrs() *LinkAttrs {
	return &dummy.LinkAttrs
}

func (dummy *Dummy) Type() string {
	return "dummy"
}

// Bridge links are simple linux bridges
type Bridge struct {
	LinkAttrs
}

func (bridge *Bridge) Attrs() *LinkAttrs {
	return &bridge.LinkAttrs
}

func (bridge *Bridge) Type() string {
	return "bridge"
}

// Vlan links have ParentIndex set in their Attrs()
type Vlan struct {
	LinkAttrs
	VlanId int
}

func (vlan *Vlan) Attrs() *LinkAttrs {
	return &vlan.LinkAttrs
}

func (vlan *Vlan) Type() string {
	return "vlan"
}

// Macvlan links have ParentIndex set in their Attrs()
type Macvlan struct {
	LinkAttrs
}

func (macvlan *Macvlan) Attrs() *LinkAttrs {
	return &macvlan.LinkAttrs
}

func (macvlan *Macvlan) Type() string {
	return "macvlan"
}

// Veth devices must specify PeerName on create
type Veth struct {
	LinkAttrs
	PeerName string // veth on create only
}

func (veth *Veth) Attrs() *LinkAttrs {
	return &veth.LinkAttrs
}

func (veth *Veth) Type() string {
	return "veth"
}

// Generic links represent types that are not currently understood
// by this netlink library.
type Generic struct {
	LinkAttrs
	LinkType string
}

func (generic *Generic) Attrs() *LinkAttrs {
	return &generic.LinkAttrs
}

func (generic *Generic) Type() string {
	return generic.LinkType
}

// iproute2 supported devices;
// vlan | veth | vcan | dummy | ifb | macvlan | macvtap |
// can | bridge | bond | ipoib | ip6tnl | ipip | sit |
// vxlan | gre | gretap | ip6gre | ip6gretap | vti