//
// Copyright (c) 2016 Intel Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

package virtcontainers

import (
	"net"
	"os"
	"reflect"
	"testing"

	"github.com/containernetworking/plugins/pkg/ns"
	"github.com/vishvananda/netlink"
	"github.com/vishvananda/netns"
)

func testNetworkModelSet(t *testing.T, value string, expected NetworkModel) {
	var netModel NetworkModel

	err := netModel.Set(value)
	if err != nil {
		t.Fatal(err)
	}

	if netModel != expected {
		t.Fatal()
	}
}

func TestNoopNetworkModelSet(t *testing.T) {
	testNetworkModelSet(t, "noop", NoopNetworkModel)
}

func TestCNINetworkModelSet(t *testing.T) {
	testNetworkModelSet(t, "CNI", CNINetworkModel)
}

func TestCNMNetworkModelSet(t *testing.T) {
	testNetworkModelSet(t, "CNM", CNMNetworkModel)
}

func TestNetworkModelSetFailure(t *testing.T) {
	var netModel NetworkModel

	err := netModel.Set("wrong-value")
	if err == nil {
		t.Fatal(err)
	}
}

func testNetworkModelString(t *testing.T, netModel *NetworkModel, expected string) {
	result := netModel.String()

	if result != expected {
		t.Fatal()
	}
}

func TestNoopNetworkModelString(t *testing.T) {
	netModel := NoopNetworkModel
	testNetworkModelString(t, &netModel, string(NoopNetworkModel))
}

func TestCNINetworkModelString(t *testing.T) {
	netModel := CNINetworkModel
	testNetworkModelString(t, &netModel, string(CNINetworkModel))
}

func TestCNMNetworkModelString(t *testing.T) {
	netModel := CNMNetworkModel
	testNetworkModelString(t, &netModel, string(CNMNetworkModel))
}

func TestWrongNetworkModelString(t *testing.T) {
	var netModel NetworkModel
	testNetworkModelString(t, &netModel, "")
}

func testNewNetworkFromNetworkModel(t *testing.T, netModel NetworkModel, expected interface{}) {
	result := newNetwork(netModel)

	if reflect.DeepEqual(result, expected) == false {
		t.Fatal()
	}
}

func TestNewNoopNetworkFromNetworkModel(t *testing.T) {
	testNewNetworkFromNetworkModel(t, NoopNetworkModel, &noopNetwork{})
}

func TestNewCNINetworkFromNetworkModel(t *testing.T) {
	testNewNetworkFromNetworkModel(t, CNINetworkModel, &cni{})
}

func TestNewCNMNetworkFromNetworkModel(t *testing.T) {
	testNewNetworkFromNetworkModel(t, CNMNetworkModel, &cnm{})
}

func TestNewUnknownNetworkFromNetworkModel(t *testing.T) {
	var netModel NetworkModel
	testNewNetworkFromNetworkModel(t, netModel, &noopNetwork{})
}

func TestCreateDeleteNetNS(t *testing.T) {
	if os.Geteuid() != 0 {
		t.Skip(testDisabledAsNonRoot)
	}

	netNSPath, err := createNetNS()
	if err != nil {
		t.Fatal(err)
	}

	if netNSPath == "" {
		t.Fatal()
	}

	_, err = os.Stat(netNSPath)
	if err != nil {
		t.Fatal(err)
	}

	err = deleteNetNS(netNSPath, true)
	if err != nil {
		t.Fatal(err)
	}
}

func testEndpointTypeSet(t *testing.T, value string, expected EndpointType) {
	//var netModel NetworkModel
	var endpointType EndpointType

	err := endpointType.Set(value)
	if err != nil {
		t.Fatal(err)
	}

	if endpointType != expected {
		t.Fatal()
	}
}

func TestPhysicalEndpointTypeSet(t *testing.T) {
	testEndpointTypeSet(t, "physical", PhysicalEndpointType)
}

func TestVirtualEndpointTypeSet(t *testing.T) {
	testEndpointTypeSet(t, "virtual", VirtualEndpointType)
}

func TestEndpointTypeSetFailure(t *testing.T) {
	var endpointType EndpointType

	err := endpointType.Set("wrong-value")
	if err == nil {
		t.Fatal(err)
	}
}

func testEndpointTypeString(t *testing.T, endpointType *EndpointType, expected string) {
	result := endpointType.String()

	if result != expected {
		t.Fatal()
	}
}

func TestPhysicalEndpointTypeString(t *testing.T) {
	endpointType := PhysicalEndpointType
	testEndpointTypeString(t, &endpointType, string(PhysicalEndpointType))
}

func TestVirtualEndpointTypeString(t *testing.T) {
	endpointType := VirtualEndpointType
	testEndpointTypeString(t, &endpointType, string(VirtualEndpointType))
}

func TestIncorrectEndpointTypeString(t *testing.T) {
	var endpointType EndpointType
	testEndpointTypeString(t, &endpointType, "")
}

func TestCreateVhostUserEndpoint(t *testing.T) {
	macAddr := net.HardwareAddr{0x02, 0x00, 0xCA, 0xFE, 0x00, 0x48}
	ifcName := "vhost-deadbeef"
	socket := "/tmp/vhu_192.168.0.1"

	netinfo := NetworkInfo{
		Iface: NetlinkIface{
			LinkAttrs: netlink.LinkAttrs{
				HardwareAddr: macAddr,
				Name:         ifcName,
			},
		},
	}

	expected := &VhostUserEndpoint{
		SocketPath:   socket,
		HardAddr:     macAddr.String(),
		IfaceName:    ifcName,
		EndpointType: VhostUserEndpointType,
	}

	result, err := createVhostUserEndpoint(netinfo, socket)
	if err != nil {
		t.Fatal(err)
	}

	if reflect.DeepEqual(result, expected) == false {
		t.Fatalf("\n\tGot %v\n\tExpecting %v", result, expected)
	}
}

func TestCreateVirtualNetworkEndpoint(t *testing.T) {
	macAddr := net.HardwareAddr{0x02, 0x00, 0xCA, 0xFE, 0x00, 0x04}

	expected := &VirtualEndpoint{
		NetPair: NetworkInterfacePair{
			ID:   "uniqueTestID-4",
			Name: "br4",
			VirtIface: NetworkInterface{
				Name:     "eth4",
				HardAddr: macAddr.String(),
			},
			TAPIface: NetworkInterface{
				Name: "tap4",
			},
			NetInterworkingModel: DefaultNetInterworkingModel,
		},
		EndpointType: VirtualEndpointType,
	}

	result, err := createVirtualNetworkEndpoint(4, "", DefaultNetInterworkingModel)
	if err != nil {
		t.Fatal(err)
	}

	// the resulting ID  will be random - so let's overwrite to test the rest of the flow
	result.NetPair.ID = "uniqueTestID-4"

	if reflect.DeepEqual(result, expected) == false {
		t.Fatal()
	}
}

func TestCreateVirtualNetworkEndpointChooseIfaceName(t *testing.T) {
	macAddr := net.HardwareAddr{0x02, 0x00, 0xCA, 0xFE, 0x00, 0x04}

	expected := &VirtualEndpoint{
		NetPair: NetworkInterfacePair{
			ID:   "uniqueTestID-4",
			Name: "br4",
			VirtIface: NetworkInterface{
				Name:     "eth1",
				HardAddr: macAddr.String(),
			},
			TAPIface: NetworkInterface{
				Name: "tap4",
			},
			NetInterworkingModel: DefaultNetInterworkingModel,
		},
		EndpointType: VirtualEndpointType,
	}

	result, err := createVirtualNetworkEndpoint(4, "eth1", DefaultNetInterworkingModel)
	if err != nil {
		t.Fatal(err)
	}

	// the resulting ID will be random - so let's overwrite to test the rest of the flow
	result.NetPair.ID = "uniqueTestID-4"

	if reflect.DeepEqual(result, expected) == false {
		t.Fatal()
	}
}

func TestCreateVirtualNetworkEndpointInvalidArgs(t *testing.T) {
	type endpointValues struct {
		idx    int
		ifName string
	}

	// all elements are expected to result in failure
	failingValues := []endpointValues{
		{-1, "bar"},
		{-1, ""},
	}

	for _, d := range failingValues {
		result, err := createVirtualNetworkEndpoint(d.idx, d.ifName, DefaultNetInterworkingModel)
		if err == nil {
			t.Fatalf("expected invalid endpoint for %v, got %v", d, result)
		}
	}
}

func TestIsPhysicalIface(t *testing.T) {
	testNetIface := "testIface0"
	testMTU := 1500
	testMACAddr := "00:00:00:00:00:01"

	hwAddr, err := net.ParseMAC(testMACAddr)
	if err != nil {
		t.Fatal(err)
	}

	link := &netlink.Bridge{
		LinkAttrs: netlink.LinkAttrs{
			Name:         testNetIface,
			MTU:          testMTU,
			HardwareAddr: hwAddr,
			TxQLen:       -1,
		},
	}

	n, err := ns.NewNS()
	if err != nil {
		t.Fatal(err)
	}
	defer n.Close()

	netnsHandle, err := netns.GetFromPath(n.Path())
	if err != nil {
		t.Fatal(err)
	}
	defer netnsHandle.Close()

	netlinkHandle, err := netlink.NewHandleAt(netnsHandle)
	if err != nil {
		t.Fatal(err)
	}
	defer netlinkHandle.Delete()

	if err := netlinkHandle.LinkAdd(link); err != nil {
		t.Fatal(err)
	}

	var isPhysical bool
	err = doNetNS(n.Path(), func(_ ns.NetNS) error {
		var err error
		isPhysical, err = isPhysicalIface(testNetIface)
		return err
	})

	if err != nil {
		t.Fatal(err)
	}

	if isPhysical == true {
		t.Fatalf("Got %+v\nExpecting %+v", isPhysical, false)
	}
}

func TestNetInterworkingModelIsValid(t *testing.T) {
	tests := []struct {
		name string
		n    NetInterworkingModel
		want bool
	}{
		{"Invalid Model", NetXConnectInvalidModel, false},
		{"Default Model", NetXConnectDefaultModel, true},
		{"Bridged Model", NetXConnectBridgedModel, true},
		{"Macvtap Model", NetXConnectMacVtapModel, true},
		{"Enlightened Model", NetXConnectEnlightenedModel, true},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := tt.n.IsValid(); got != tt.want {
				t.Errorf("NetInterworkingModel.IsValid() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestNetInterworkingModelSetModel(t *testing.T) {
	var n NetInterworkingModel
	tests := []struct {
		name      string
		modelName string
		wantErr   bool
	}{
		{"Invalid Model", "Invalid", true},
		{"default Model", "default", false},
		{"bridged Model", "bridged", false},
		{"macvtap Model", "macvtap", false},
		{"enlightened Model", "enlightened", false},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if err := n.SetModel(tt.modelName); (err != nil) != tt.wantErr {
				t.Errorf("NetInterworkingModel.SetModel() error = %v, wantErr %v", err, tt.wantErr)
			}
		})
	}
}