package streamallocator

import (
	"github.com/livekit/protocol/livekit"
)

// ------------------------------------------------

type StreamState int

const (
	StreamStateActive StreamState = iota
	StreamStatePaused
)

func (s StreamState) String() string {
	switch s {
	case StreamStateActive:
		return "active"
	case StreamStatePaused:
		return "paused"
	default:
		return "unknown"
	}
}

// ------------------------------------------------

type StreamStateInfo struct {
	ParticipantID livekit.ParticipantID
	TrackID       livekit.TrackID
	State         StreamState
}

type StreamStateUpdate struct {
	StreamStates []*StreamStateInfo
}

func NewStreamStateUpdate() *StreamStateUpdate {
	return &StreamStateUpdate{}
}

func (s *StreamStateUpdate) HandleStreamingChange(isPaused bool, track *Track) {
	if isPaused {
		s.StreamStates = append(s.StreamStates, &StreamStateInfo{
			ParticipantID: track.PublisherID(),
			TrackID:       track.ID(),
			State:         StreamStatePaused,
		})
	} else {
		s.StreamStates = append(s.StreamStates, &StreamStateInfo{
			ParticipantID: track.PublisherID(),
			TrackID:       track.ID(),
			State:         StreamStateActive,
		})
	}
}

func (s *StreamStateUpdate) Empty() bool {
	return len(s.StreamStates) == 0
}

// ------------------------------------------------