package main

import (
	"fail2ban-prometheus-exporter/cfg"
	"fail2ban-prometheus-exporter/export"
	"fmt"
	"log"
	"net/http"

	_ "github.com/mattn/go-sqlite3"
	"github.com/prometheus/client_golang/prometheus"
	"github.com/prometheus/client_golang/prometheus/promhttp"
)

const (
	metricsPath = "/metrics"
)

var (
	version = "dev"
	commit  = "none"
	date    = "unknown"
	builtBy = "unknown"
)

func printAppVersion() {
	fmt.Println(version)
	fmt.Printf("    build date:  %s\r\n    commit hash: %s\r\n    built by:    %s\r\n", date, commit, builtBy)
}

func main() {
	appSettings := cfg.Parse()
	if appSettings.VersionMode {
		printAppVersion()
	} else {
		addr := fmt.Sprintf("0.0.0.0:%d", appSettings.MetricsPort)

		log.Printf("starting fail2ban exporter at %s", addr)

		exporter := export.NewExporter(appSettings, version)
		prometheus.MustRegister(exporter)

		http.Handle(metricsPath, promhttp.Handler())
		log.Printf("metrics available at '%s'", metricsPath)

		svrErr := make(chan error)
		go func() {
			svrErr <- http.ListenAndServe(addr, nil)
		}()
		log.Print("ready")

		err := <-svrErr
		log.Print(err)
	}
}