// Copyright 2023 LiveKit, Inc.
//
// 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 rtc

import (
	"testing"

	"github.com/stretchr/testify/require"

	"github.com/livekit/livekit-server/pkg/rtc/types/typesfakes"
	"github.com/livekit/protocol/livekit"
	"github.com/livekit/protocol/logger"
	"github.com/livekit/protocol/observability/roomobs"
)

func newTestDataTrackSubscriber(id livekit.ParticipantID, identity livekit.ParticipantIdentity, isRecorder bool) *typesfakes.FakeLocalParticipant {
	sub := &typesfakes.FakeLocalParticipant{}
	sub.IDReturns(id)
	sub.IdentityReturns(identity)
	sub.IsRecorderReturns(isRecorder)
	sub.GetLoggerReturns(logger.GetLogger())
	sub.GetReporterReturns(roomobs.NewNoopParticipantSessionReporter())
	sub.GetTelemetryListenerReturns(&typesfakes.FakeParticipantTelemetryListener{})
	return sub
}

func TestDataTrackRevokeDisallowedSubscribers(t *testing.T) {
	dt := NewDataTrack(
		DataTrackParams{
			Logger:              logger.GetLogger(),
			ParticipantID:       func() livekit.ParticipantID { return "pubID" },
			ParticipantIdentity: "pub",
		},
		&livekit.DataTrackInfo{
			PubHandle: 1,
			Sid:       "DTR_test",
			Name:      "test",
		},
	)
	defer dt.Close()

	allowed := newTestDataTrackSubscriber("allowedID", "allowed", false)
	disallowed := newTestDataTrackSubscriber("disallowedID", "disallowed", false)
	recorder := newTestDataTrackSubscriber("recorderID", "recorder", true)

	for _, sub := range []*typesfakes.FakeLocalParticipant{allowed, disallowed, recorder} {
		_, err := dt.AddSubscriber(sub)
		require.NoError(t, err)
		require.True(t, dt.IsSubscriber(sub.ID()))
	}

	revoked := dt.RevokeDisallowedSubscribers([]livekit.ParticipantIdentity{"allowed"})
	require.Equal(t, []livekit.ParticipantIdentity{"disallowed"}, revoked)

	// disallowed subscriber is removed, allowed and permission exempt (recorder) subscribers are kept
	require.True(t, dt.IsSubscriber(allowed.ID()))
	require.False(t, dt.IsSubscriber(disallowed.ID()))
	require.True(t, dt.IsSubscriber(recorder.ID()))
}