package server

import (
	"github.com/prometheus/client_golang/prometheus"
)

var (
	metrics = newMetrics()
)

type serverMetrics struct {
	messagesPublishedSuccess prometheus.Counter
	messagesPublishedFailure prometheus.Counter
	messagesCached           prometheus.Gauge
	firebasePublishedSuccess prometheus.Counter
	firebasePublishedFailure prometheus.Counter
	emailsPublishedSuccess   prometheus.Counter
	emailsPublishedFailure   prometheus.Counter
	visitors                 prometheus.Gauge
	subscribers              prometheus.Gauge
	topics                   prometheus.Gauge
	httpRequests             *prometheus.CounterVec
}

func newMetrics() *serverMetrics {
	m := &serverMetrics{
		messagesPublishedSuccess: prometheus.NewCounter(prometheus.CounterOpts{
			Name: "ntfy_messages_published_success",
		}),
		messagesPublishedFailure: prometheus.NewCounter(prometheus.CounterOpts{
			Name: "ntfy_messages_published_failure",
		}),
		messagesCached: prometheus.NewGauge(prometheus.GaugeOpts{
			Name: "ntfy_messages_cached_total",
		}),
		firebasePublishedSuccess: prometheus.NewCounter(prometheus.CounterOpts{
			Name: "ntfy_firebase_published_success",
		}),
		firebasePublishedFailure: prometheus.NewCounter(prometheus.CounterOpts{
			Name: "ntfy_firebase_published_failure",
		}),
		emailsPublishedSuccess: prometheus.NewCounter(prometheus.CounterOpts{
			Name: "ntfy_emails_sent_success",
		}),
		emailsPublishedFailure: prometheus.NewCounter(prometheus.CounterOpts{
			Name: "ntfy_emails_sent_failure",
		}),
		visitors: prometheus.NewGauge(prometheus.GaugeOpts{
			Name: "ntfy_visitors_total",
		}),
		subscribers: prometheus.NewGauge(prometheus.GaugeOpts{
			Name: "ntfy_subscribers_total",
		}),
		topics: prometheus.NewGauge(prometheus.GaugeOpts{
			Name: "ntfy_topics_total",
		}),
		httpRequests: prometheus.NewCounterVec(prometheus.CounterOpts{
			Name: "ntfy_http_requests_total",
		}, []string{"http_code", "ntfy_code", "http_method"}),
	}
	prometheus.MustRegister(
		m.messagesPublishedSuccess,
		m.messagesPublishedFailure,
		m.messagesCached,
		m.firebasePublishedSuccess,
		m.firebasePublishedFailure,
		m.emailsPublishedSuccess,
		m.emailsPublishedFailure,
		m.visitors,
		m.subscribers,
		m.topics,
		m.httpRequests,
	)
	return m
}