package cmd

import (
	"flag"
	"fmt"

	"github.com/portainer/kubesolo-os/update/pkg/metrics"
	"github.com/portainer/kubesolo-os/update/pkg/state"
)

// Metrics starts the Prometheus-compatible metrics HTTP server.
func Metrics(args []string) error {
	fs := flag.NewFlagSet("metrics", flag.ExitOnError)
	listenAddr := fs.String("listen", ":9100", "Metrics HTTP listen address")
	grubenvPath := fs.String("grubenv", "/boot/grub/grubenv", "Path to grubenv file")
	statePath := fs.String("state", state.DefaultPath, "Path to update state.json")
	if err := fs.Parse(args); err != nil {
		return fmt.Errorf("parse flags: %w", err)
	}

	srv := metrics.NewServer(*listenAddr, *grubenvPath)
	srv.SetStatePath(*statePath)
	return srv.ListenAndServe()
}