// 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 videolayerselector

import (
	"github.com/livekit/livekit-server/pkg/sfu/buffer"
	"github.com/livekit/livekit-server/pkg/sfu/videolayerselector/temporallayerselector"
	"github.com/livekit/protocol/logger"
)

type VideoLayerSelectorResult struct {
	IsSelected                    bool
	IsRelevant                    bool
	IsSwitching                   bool
	IsResuming                    bool
	RTPMarker                     bool
	DependencyDescriptorExtension []byte
}

type VideoLayerSelector interface {
	getBase() *Base

	getLogger() logger.Logger

	IsOvershootOkay() bool

	SetTemporalLayerSelector(tls temporallayerselector.TemporalLayerSelector)
	SetEnableStartAtDesiredQuality(enable bool)

	SetMax(maxLayer buffer.VideoLayer)
	SetMaxSpatial(layer int32)
	SetMaxTemporal(layer int32)
	GetMax() buffer.VideoLayer

	SetTarget(targetLayer buffer.VideoLayer)
	GetTarget() buffer.VideoLayer

	SetRequestSpatial(layer int32)
	GetRequestSpatial() int32

	CheckSync() (locked bool, layer int32)

	SetMaxSeen(maxSeenLayer buffer.VideoLayer)
	SetMaxSeenSpatial(layer int32)
	SetMaxSeenTemporal(layer int32)
	GetMaxSeen() buffer.VideoLayer

	SetCurrent(currentLayer buffer.VideoLayer)
	GetCurrent() buffer.VideoLayer

	Select(extPkt *buffer.ExtPacket, layer int32) VideoLayerSelectorResult
	SelectTemporal(extPkt *buffer.ExtPacket) int32
	Rollback()
}