package metrics

import (
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/tree"
	"github.com/prometheus/client_golang/prometheus"
)

const namespace = "frostfs_node"

type NodeMetrics struct {
	objectServiceMetrics
	engineMetrics
	stateMetrics
	replicatorMetrics

	writeCacheMetrics *writeCacheMetrics
	treeService       *treeServiceMetrics
	epoch             metric[prometheus.Gauge]
	gc                *gcMetrics
}

func NewNodeMetrics() *NodeMetrics {
	objectService := newObjectServiceMetrics()
	objectService.register()

	engine := newEngineMetrics()
	engine.register()

	state := newStateMetrics()
	state.register()

	replicator := newReplicatorMetrics()
	replicator.register()

	treeService := newTreeServiceMetrics()
	treeService.register()

	epoch := newGauge(prometheus.GaugeOpts{
		Namespace: namespace,
		Subsystem: innerRingSubsystem,
		Name:      "epoch",
		Help:      "Current epoch as seen by inner-ring node.",
	})
	mustRegister(epoch)

	writeCacheMetrics := newWriteCacheMetrics()
	writeCacheMetrics.register()

	gc := newGCMetrics()
	gc.register()

	return &NodeMetrics{
		objectServiceMetrics: objectService,
		engineMetrics:        engine,
		stateMetrics:         state,
		replicatorMetrics:    replicator,
		treeService:          treeService,
		epoch:                epoch,
		writeCacheMetrics:    writeCacheMetrics,
		gc:                   gc,
	}
}

// SetEpoch updates epoch metric.
func (m *NodeMetrics) SetEpoch(epoch uint64) {
	m.epoch.value.Set(float64(epoch))
}

// WriteCache returns WriteCache metrics.
func (m *NodeMetrics) WriteCache() WriteCacheMetrics {
	if m == nil {
		return nil
	}
	return m.writeCacheMetrics
}

func (m *NodeMetrics) TreeService() tree.MetricsRegister {
	return m.treeService
}

func (m *NodeMetrics) GC() GCMetrics {
	return m.gc
}