package commands

import (
	"strings"

	"github.com/ledgerwatch/erigon/cmd/headers/download"
	"github.com/ledgerwatch/erigon/cmd/utils"
	"github.com/ledgerwatch/erigon/common/paths"
	"github.com/ledgerwatch/erigon/eth/protocols/eth"
	"github.com/spf13/cobra"
)

var (
	natSetting   string   // NAT setting
	port         int      // Listening port
	staticPeers  []string // static peers
	discoveryDNS []string
	nodiscover   bool // disable sentry's discovery mechanism
	protocol     string
	netRestrict  string // CIDR to restrict peering to
)

func init() {
	sentryCmd.Flags().StringVar(&natSetting, "nat", "", `NAT port mapping mechanism (any|none|upnp|pmp|extip:<IP>)
	     "" or "none"         default - do not nat
	     "extip:77.12.33.4"   will assume the local machine is reachable on the given IP
	     "any"                uses the first auto-detected mechanism
	     "upnp"               uses the Universal Plug and Play protocol
	     "pmp"                uses NAT-PMP with an auto-detected gateway address
	     "pmp:192.168.0.1"    uses NAT-PMP with the given gateway address
`)
	sentryCmd.Flags().IntVar(&port, "port", 30303, "p2p port number")
	sentryCmd.Flags().StringVar(&sentryAddr, "sentry.api.addr", "localhost:9091", "comma separated sentry addresses '<host>:<port>,<host>:<port>'")
	sentryCmd.Flags().StringVar(&protocol, "p2p.protocol", "eth66", "eth65|eth66")
	sentryCmd.Flags().StringSliceVar(&staticPeers, "staticpeers", []string{}, "static peer list [enode]")
	sentryCmd.Flags().StringSliceVar(&discoveryDNS, utils.DNSDiscoveryFlag.Name, []string{}, utils.DNSDiscoveryFlag.Usage)
	sentryCmd.Flags().BoolVar(&nodiscover, utils.NoDiscoverFlag.Name, false, utils.NoDiscoverFlag.Usage)
	sentryCmd.Flags().StringVar(&netRestrict, "netrestrict", "", "CIDR range to accept peers from <CIDR>")
	sentryCmd.Flags().StringVar(&datadir, utils.DataDirFlag.Name, paths.DefaultDataDir(), utils.DataDirFlag.Usage)
	if err := sentryCmd.MarkFlagDirname(utils.DataDirFlag.Name); err != nil {
		panic(err)
	}
	rootCmd.AddCommand(sentryCmd)
}

var sentryCmd = &cobra.Command{
	Use:   "sentry",
	Short: "Run p2p sentry for the downloader",
	RunE: func(cmd *cobra.Command, args []string) error {
		p := eth.ETH66
		switch strings.ToLower(protocol) {
		case "eth65":
			p = eth.ETH65
		}

		return download.Sentry(datadir, natSetting, port, sentryAddr, staticPeers, discoveryDNS, nodiscover, netRestrict, uint(p))
	},
}