package sandbox

import (
	"net"
	"os"
	"path/filepath"
	"runtime"
	"testing"

	"github.com/docker/libnetwork/netutils"
	"github.com/vishvananda/netlink"
	"github.com/vishvananda/netns"
)

const (
	vethName1     = "wierdlongname1"
	vethName2     = "wierdlongname2"
	sboxIfaceName = "containername"
)

func newKey(t *testing.T) (string, error) {
	name, err := netutils.GenerateRandomName("netns", 12)
	if err != nil {
		return "", err
	}

	name = filepath.Join("/tmp", name)
	if _, err := os.Create(name); err != nil {
		return "", err
	}

	return name, nil
}

func newInfo(t *testing.T) (*Info, error) {
	veth := &netlink.Veth{
		LinkAttrs: netlink.LinkAttrs{Name: vethName1, TxQLen: 0},
		PeerName:  vethName2}
	err := netlink.LinkAdd(veth)
	if err != nil {
		return nil, err
	}

	// Store the sandbox side pipe interface
	// This is needed for cleanup on DeleteEndpoint()
	intf := &Interface{}
	intf.SrcName = vethName2
	intf.DstName = sboxIfaceName

	ip4, addr, err := net.ParseCIDR("192.168.1.100/24")
	if err != nil {
		return nil, err
	}
	intf.Address = addr
	intf.Address.IP = ip4

	// ip6, addrv6, err := net.ParseCIDR("2001:DB8::ABCD/48")
	ip6, addrv6, err := net.ParseCIDR("fe80::2/64")
	if err != nil {
		return nil, err
	}
	intf.AddressIPv6 = addrv6
	intf.AddressIPv6.IP = ip6

	sinfo := &Info{Interfaces: []*Interface{intf}}
	sinfo.Gateway = net.ParseIP("192.168.1.1")
	// sinfo.GatewayIPv6 = net.ParseIP("2001:DB8::1")
	sinfo.GatewayIPv6 = net.ParseIP("fe80::1")

	return sinfo, nil
}

func verifySandbox(t *testing.T, s Sandbox) {
	_, ok := s.(*networkNamespace)
	if !ok {
		t.Fatalf("The sandox interface returned is not of type networkNamespace")
	}

	origns, err := netns.Get()
	if err != nil {
		t.Fatalf("Could not get the current netns: %v", err)
	}
	defer origns.Close()

	f, err := os.OpenFile(s.Key(), os.O_RDONLY, 0)
	if err != nil {
		t.Fatalf("Failed top open network namespace path %q: %v", s.Key(), err)
	}
	defer f.Close()

	runtime.LockOSThread()
	defer runtime.UnlockOSThread()

	nsFD := f.Fd()
	if err = netns.Set(netns.NsHandle(nsFD)); err != nil {
		t.Fatalf("Setting to the namespace pointed to by the sandbox %s failed: %v", s.Key(), err)
	}
	defer netns.Set(origns)

	_, err = netlink.LinkByName(sboxIfaceName)
	if err != nil {
		t.Fatalf("Could not find the interface %s inside the sandbox: %v", sboxIfaceName,
			err)
	}
}