/*
 *
 * Copyright 2021 Google LLC
 *
 * 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
 *
 *     https://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 s2a

import (
	"testing"

	"github.com/google/go-cmp/cmp"
	s2apb "github.com/google/s2a-go/internal/proto/common_go_proto"
	s2av2pb "github.com/google/s2a-go/internal/proto/v2/common_go_proto"
	"google.golang.org/protobuf/testing/protocmp"
)

func TestToProtoIdentity(t *testing.T) {
	for _, tc := range []struct {
		identity    Identity
		outIdentity *s2apb.Identity
	}{
		{
			identity: NewSpiffeID("test_spiffe_id"),
			outIdentity: &s2apb.Identity{
				IdentityOneof: &s2apb.Identity_SpiffeId{SpiffeId: "test_spiffe_id"},
			},
		},
		{
			identity: NewHostname("test_hostname"),
			outIdentity: &s2apb.Identity{
				IdentityOneof: &s2apb.Identity_Hostname{Hostname: "test_hostname"},
			},
		},
		{
			identity: NewUID("test_uid"),
			outIdentity: &s2apb.Identity{
				IdentityOneof: &s2apb.Identity_Uid{Uid: "test_uid"},
			},
		},
		{
			identity:    nil,
			outIdentity: nil,
		},
	} {
		t.Run(tc.outIdentity.String(), func(t *testing.T) {
			protoSpiffeID, err := toProtoIdentity(tc.identity)
			if err != nil {
				t.Errorf("toProtoIdentity(%v) failed: %v", tc.identity, err)
			}
			if got, want := protoSpiffeID, tc.outIdentity; !cmp.Equal(got, want, protocmp.Transform()) {
				t.Errorf("toProtoIdentity(%v) = %v, want %v", tc.outIdentity, got, want)
			}
		})
	}
}

func TestToV2ProtoIdentity(t *testing.T) {
	for _, tc := range []struct {
		identity    Identity
		outIdentity *s2av2pb.Identity
	}{
		{
			identity: NewSpiffeID("test_spiffe_id"),
			outIdentity: &s2av2pb.Identity{
				IdentityOneof: &s2av2pb.Identity_SpiffeId{SpiffeId: "test_spiffe_id"},
			},
		},
		{
			identity: NewHostname("test_hostname"),
			outIdentity: &s2av2pb.Identity{
				IdentityOneof: &s2av2pb.Identity_Hostname{Hostname: "test_hostname"},
			},
		},
		{
			identity: NewUID("test_uid"),
			outIdentity: &s2av2pb.Identity{
				IdentityOneof: &s2av2pb.Identity_Uid{Uid: "test_uid"},
			},
		},
		{
			identity: &UnspecifiedID{
				Attr: map[string]string{"key": "value"},
			},
			outIdentity: &s2av2pb.Identity{
				Attributes: map[string]string{"key": "value"},
			},
		},
		{
			identity:    nil,
			outIdentity: nil,
		},
	} {
		t.Run(tc.outIdentity.String(), func(t *testing.T) {
			protoSpiffeID, err := toV2ProtoIdentity(tc.identity)
			if err != nil {
				t.Errorf("toV2ProtoIdentity(%v) failed: %v", tc.identity, err)
			}
			if got, want := protoSpiffeID, tc.outIdentity; !cmp.Equal(got, want, protocmp.Transform()) {
				t.Errorf("toV2ProtoIdentity(%v) = %v, want %v", tc.outIdentity, got, want)
			}
		})
	}
}

// Implements the Identity interface and is used to get an error from toV2ProtoIdentity.
type UnsupportedIdentity struct{}

func (u *UnsupportedIdentity) Name() string                  { return "" }
func (u *UnsupportedIdentity) Attributes() map[string]string { return map[string]string{} }

func TestToV2ProtoIdentityError(t *testing.T) {
	if _, err := toV2ProtoIdentity(&UnsupportedIdentity{}); err == nil {
		t.Errorf("toV2ProtoIdentity(&UnsupportedIdentity{}) err = nil, want err != nil")
	}
}