// Copyright Istio 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 matcher

import (
	"strings"
	"testing"

	corepb "github.com/envoyproxy/go-control-plane/envoy/config/core/v3"
	"github.com/golang/protobuf/ptypes/wrappers"
	"github.com/google/go-cmp/cmp"
	"google.golang.org/protobuf/testing/protocmp"
)

func TestCidrRange(t *testing.T) {
	testCases := []struct {
		Name   string
		V      string
		Expect *corepb.CidrRange
		Err    string
	}{
		{
			Name: "cidr with two /",
			V:    "192.168.0.0//16",
			Err:  "invalid cidr range",
		},
		{
			Name: "cidr with invalid prefix length",
			V:    "192.168.0.0/ab",
			Err:  "invalid cidr range",
		},
		{
			Name: "cidr with negative prefix length",
			V:    "192.168.0.0/-16",
			Err:  "invalid cidr range",
		},
		{
			Name: "valid cidr range",
			V:    "192.168.0.0/16",
			Expect: &corepb.CidrRange{
				AddressPrefix: "192.168.0.0",
				PrefixLen:     &wrappers.UInt32Value{Value: 16},
			},
		},
		{
			Name: "invalid ip address",
			V:    "19216800",
			Err:  "invalid ip address",
		},
		{
			Name: "valid ipv4 address",
			V:    "192.168.0.0",
			Expect: &corepb.CidrRange{
				AddressPrefix: "192.168.0.0",
				PrefixLen:     &wrappers.UInt32Value{Value: 32},
			},
		},
		{
			Name: "valid ipv6 address",
			V:    "2001:abcd:85a3::8a2e:370:1234",
			Expect: &corepb.CidrRange{
				AddressPrefix: "2001:abcd:85a3::8a2e:370:1234",
				PrefixLen:     &wrappers.UInt32Value{Value: 128},
			},
		},
	}

	for _, tc := range testCases {
		actual, err := CidrRange(tc.V)
		if tc.Err != "" {
			if err == nil {
				t.Errorf("%s: expecting error: %s but found no error", tc.Name, tc.Err)
			} else if !strings.HasPrefix(err.Error(), tc.Err) {
				t.Errorf("%s: expecting error: %s, but got: %s", tc.Name, tc.Err, err.Error())
			}
		} else if !cmp.Equal(tc.Expect, actual, protocmp.Transform()) {
			t.Errorf("%s: expecting %v, but got %v", tc.Name, tc.Expect, actual)
		}
	}
}
