package server

import (
	"fmt"
	"log"
	"net/http"

	"github.com/go-chi/chi/v5"
	"github.com/prometheus/client_golang/prometheus"
	"github.com/prometheus/client_golang/prometheus/promhttp"
)

var httpRequestsTotal = prometheus.NewCounter(
	prometheus.CounterOpts{
		Name: "silverbullet_http_requests",
		Help: "Total number of HTTP requests to SilverBullet",
	},
)

func init() {
	prometheus.MustRegister(httpRequestsTotal)
}

func httpStatsMiddleware(config *ServerConfig) func(http.Handler) http.Handler {
	if config.MetricsPort == 0 {
		// NOOP
		return func(next http.Handler) http.Handler {
			return next
		}
	} else {
		return func(next http.Handler) http.Handler {
			return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
				httpRequestsTotal.Inc()
				next.ServeHTTP(w, r)
			})
		}
	}
}

func runMetricsServer(config *ServerConfig) {
	if config.MetricsPort != 0 {
		metricRouter := chi.NewRouter()
		metricsServer := &http.Server{
			Addr:    fmt.Sprintf("%s:%d", config.BindHost, config.MetricsPort),
			Handler: metricRouter,
		}
		metricRouter.Handle("/metrics", promhttp.Handler())
		log.Printf("Metrics server started on %s:%d", config.BindHost, config.MetricsPort)
		metricsServer.ListenAndServe()
	}
}