package metrics

import (
	"fmt"
	"strconv"
	"time"

	"git.frostfs.info/TrueCloudLab/frostfs-observability/metrics"
	"github.com/prometheus/client_golang/prometheus"
)

const (
	mcSubsystem = "morphcache"
	mcSuccess   = "success"
)

type MorphCacheMetrics interface {
	AddNNSContractHashDuration(success bool, d time.Duration)

	AddGroupKeyDuration(success bool, d time.Duration)

	AddTxHeightDuration(success bool, d time.Duration)
}

type morphCacheMetrics struct {
	// Duration of processing get nns contract hash request
	nnsContractHashDuration *prometheus.HistogramVec

	// Duration of processing get group key request
	groupKeyDuration *prometheus.HistogramVec

	// Duration of processing get tx height request
	txHeightDuration *prometheus.HistogramVec
}

var _ MorphCacheMetrics = (*morphCacheMetrics)(nil)

func newMorphCacheMetrics() *morphCacheMetrics {
	return &morphCacheMetrics{
		nnsContractHashDuration: newMCMethodDurationCounter("nns_contract_hash"),
		groupKeyDuration:        newMCMethodDurationCounter("group_key"),
		txHeightDuration:        newMCMethodDurationCounter("tx_height"),
	}
}

func (m *morphCacheMetrics) AddNNSContractHashDuration(success bool, d time.Duration) {
	m.nnsContractHashDuration.With(
		prometheus.Labels{
			mcSuccess: strconv.FormatBool(success),
		},
	).Observe(float64(d))
}

func (m *morphCacheMetrics) AddGroupKeyDuration(success bool, d time.Duration) {
	m.groupKeyDuration.With(
		prometheus.Labels{
			mcSuccess: strconv.FormatBool(success),
		},
	).Observe(float64(d))
}

func (m *morphCacheMetrics) AddTxHeightDuration(success bool, d time.Duration) {
	m.txHeightDuration.With(
		prometheus.Labels{
			mcSuccess: strconv.FormatBool(success),
		},
	).Observe(float64(d))
}

func newMCMethodDurationCounter(method string) *prometheus.HistogramVec {
	return metrics.NewHistogramVec(prometheus.HistogramOpts{
		Namespace: namespace,
		Subsystem: mcSubsystem,
		Name:      fmt.Sprintf("%s_req_duration_seconds", method),
		Help:      fmt.Sprintf("Accumulated %s request process duration", method),
	}, []string{mcSuccess})
}