// Package metrics defines rule-engine-service's Prometheus metrics.
// Registered automatically (via promauto) into the default registry on
// import; served by main.go's dedicated metrics HTTP server.
package metrics

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

var (
	ReadingsConsumed = promauto.NewCounter(prometheus.CounterOpts{
		Name: "rule_engine_readings_consumed_total",
		Help: "Total number of telemetry.new_reading events consumed from RabbitMQ.",
	})

	RulesMatched = promauto.NewCounter(prometheus.CounterOpts{
		Name: "rule_engine_rules_matched_total",
		Help: "Total number of rule conditions that evaluated true and were dispatched.",
	})

	RulesTriggered = promauto.NewCounterVec(prometheus.CounterOpts{
		Name: "rule_engine_rules_triggered_total",
		Help: "Total number of rule dispatch attempts, by action type and outcome.",
	}, []string{"action_type", "outcome"})

	DispatchDuration = promauto.NewHistogramVec(prometheus.HistogramOpts{
		Name:    "rule_engine_dispatch_duration_seconds",
		Help:    "Duration of the gRPC/HTTP call to device-control-service, by action type.",
		Buckets: prometheus.DefBuckets,
	}, []string{"action_type"})

	CacheRefreshes = promauto.NewCounterVec(prometheus.CounterOpts{
		Name: "rule_engine_cache_refresh_total",
		Help: "Total number of automation_rules cache refreshes from PostgreSQL, by outcome.",
	}, []string{"outcome"})
)