// Copyright 2015 CNI authors
//
// 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 main

import (
	"net"
	"reflect"
	"testing"

	"github.com/containernetworking/cni/pkg/types"
	"github.com/d2g/dhcp4"
)

func validateRoutes(t *testing.T, routes []*types.Route) {
	expected := []*types.Route{
		{
			Dst: net.IPNet{
				IP:   net.IPv4(10, 0, 0, 0),
				Mask: net.CIDRMask(8, 32),
			},
			GW: net.IPv4(10, 1, 2, 3),
		},
		{
			Dst: net.IPNet{
				IP:   net.IPv4(192, 168, 1, 0),
				Mask: net.CIDRMask(24, 32),
			},
			GW: net.IPv4(192, 168, 2, 3),
		},
	}

	if len(routes) != len(expected) {
		t.Fatalf("wrong length slice; expected %v, got %v", len(expected), len(routes))
	}

	for i := 0; i < len(routes); i++ {
		a := routes[i]
		e := expected[i]

		if a.Dst.String() != e.Dst.String() {
			t.Errorf("route.Dst mismatch: expected %v, got %v", e.Dst, a.Dst)
		}

		if !a.GW.Equal(e.GW) {
			t.Errorf("route.GW mismatch: expected %v, got %v", e.GW, a.GW)
		}
	}
}

func TestParseRoutes(t *testing.T) {
	opts := make(dhcp4.Options)
	opts[dhcp4.OptionStaticRoute] = []byte{10, 0, 0, 0, 10, 1, 2, 3, 192, 168, 1, 0, 192, 168, 2, 3}
	routes := parseRoutes(opts)

	validateRoutes(t, routes)
}

func TestParseCIDRRoutes(t *testing.T) {
	opts := make(dhcp4.Options)
	opts[dhcp4.OptionClasslessRouteFormat] = []byte{8, 10, 10, 1, 2, 3, 24, 192, 168, 1, 192, 168, 2, 3}
	routes := parseCIDRRoutes(opts)

	validateRoutes(t, routes)
}

func TestParseOptionName(t *testing.T) {
	tests := []struct {
		name    string
		option  string
		want    dhcp4.OptionCode
		wantErr bool
	}{
		{
			"hostname", "host-name", dhcp4.OptionHostName, false,
		},
		{
			"hostname in number", "12", dhcp4.OptionHostName, false,
		},
		{
			"random string", "doNotparseMe", 0, true,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got, err := parseOptionName(tt.option)
			if (err != nil) != tt.wantErr {
				t.Errorf("parseOptionName() error = %v, wantErr %v", err, tt.wantErr)
				return
			}
			if !reflect.DeepEqual(got, tt.want) {
				t.Errorf("parseOptionName() = %v, want %v", got, tt.want)
			}
		})
	}
}
