package cli

import (
	"encoding/json"
	"fmt"
	"os"
	"sort"
	"strings"
	"text/tabwriter"

	"github.com/libp2p/go-libp2p-core/peer"
	protocol "github.com/libp2p/go-libp2p-core/protocol"

	"github.com/dustin/go-humanize"
	"github.com/urfave/cli/v2"

	"github.com/filecoin-project/lotus/lib/addrutil"
)

var netCmd = &cli.Command{
	Name:  "net",
	Usage: "Manage P2P Network",
	Subcommands: []*cli.Command{
		NetPeers,
		netConnect,
		NetListen,
		NetId,
		netFindPeer,
		netScores,
		NetReachability,
		NetBandwidthCmd,
	},
}

var NetPeers = &cli.Command{
	Name:  "peers",
	Usage: "Print peers",
	Flags: []cli.Flag{
		&cli.BoolFlag{
			Name:    "agent",
			Aliases: []string{"a"},
			Usage:   "Print agent name",
		},
	},
	Action: func(cctx *cli.Context) error {
		api, closer, err := GetAPI(cctx)
		if err != nil {
			return err
		}
		defer closer()
		ctx := ReqContext(cctx)
		peers, err := api.NetPeers(ctx)
		if err != nil {
			return err
		}

		sort.Slice(peers, func(i, j int) bool {
			return strings.Compare(string(peers[i].ID), string(peers[j].ID)) > 0
		})

		for _, peer := range peers {
			var agent string
			if cctx.Bool("agent") {
				agent, err = api.NetAgentVersion(ctx, peer.ID)
				if err != nil {
					log.Warnf("getting agent version: %s", err)
				} else {
					agent = ", " + agent
				}
			}

			fmt.Printf("%s, %s%s\n", peer.ID, peer.Addrs, agent)
		}

		return nil
	},
}

var netScores = &cli.Command{
	Name:  "scores",
	Usage: "Print peers' pubsub scores",
	Flags: []cli.Flag{
		&cli.BoolFlag{
			Name:  "extended",
			Usage: "print extended peer scores in json",
		},
	},
	Action: func(cctx *cli.Context) error {
		api, closer, err := GetAPI(cctx)
		if err != nil {
			return err
		}
		defer closer()
		ctx := ReqContext(cctx)
		scores, err := api.NetPubsubScores(ctx)
		if err != nil {
			return err
		}

		if cctx.Bool("extended") {
			enc := json.NewEncoder(os.Stdout)
			for _, peer := range scores {
				err := enc.Encode(peer)
				if err != nil {
					return err
				}
			}
		} else {
			for _, peer := range scores {
				fmt.Printf("%s, %f\n", peer.ID, peer.Score.Score)
			}
		}

		return nil
	},
}

var NetListen = &cli.Command{
	Name:  "listen",
	Usage: "List listen addresses",
	Action: func(cctx *cli.Context) error {
		api, closer, err := GetAPI(cctx)
		if err != nil {
			return err
		}
		defer closer()
		ctx := ReqContext(cctx)

		addrs, err := api.NetAddrsListen(ctx)
		if err != nil {
			return err
		}

		for _, peer := range addrs.Addrs {
			fmt.Printf("%s/p2p/%s\n", peer, addrs.ID)
		}
		return nil
	},
}

var netConnect = &cli.Command{
	Name:      "connect",
	Usage:     "Connect to a peer",
	ArgsUsage: "[peerMultiaddr]",
	Action: func(cctx *cli.Context) error {
		api, closer, err := GetAPI(cctx)
		if err != nil {
			return err
		}
		defer closer()
		ctx := ReqContext(cctx)

		pis, err := addrutil.ParseAddresses(ctx, cctx.Args().Slice())
		if err != nil {
			return err
		}

		for _, pi := range pis {
			fmt.Printf("connect %s: ", pi.ID.Pretty())
			err := api.NetConnect(ctx, pi)
			if err != nil {
				fmt.Println("failure")
				return err
			}
			fmt.Println("success")
		}

		return nil
	},
}

var NetId = &cli.Command{
	Name:  "id",
	Usage: "Get node identity",
	Action: func(cctx *cli.Context) error {
		api, closer, err := GetAPI(cctx)
		if err != nil {
			return err
		}
		defer closer()

		ctx := ReqContext(cctx)

		pid, err := api.ID(ctx)
		if err != nil {
			return err
		}

		fmt.Println(pid)
		return nil
	},
}

var netFindPeer = &cli.Command{
	Name:      "findpeer",
	Usage:     "Find the addresses of a given peerID",
	ArgsUsage: "[peerId]",
	Action: func(cctx *cli.Context) error {
		if cctx.NArg() != 1 {
			fmt.Println("Usage: findpeer [peer ID]")
			return nil
		}

		pid, err := peer.Decode(cctx.Args().First())
		if err != nil {
			return err
		}

		api, closer, err := GetAPI(cctx)
		if err != nil {
			return err
		}
		defer closer()

		ctx := ReqContext(cctx)

		addrs, err := api.NetFindPeer(ctx, pid)

		if err != nil {
			return err
		}

		fmt.Println(addrs)
		return nil
	},
}

var NetReachability = &cli.Command{
	Name:  "reachability",
	Usage: "Print information about reachability from the internet",
	Action: func(cctx *cli.Context) error {
		api, closer, err := GetAPI(cctx)
		if err != nil {
			return err
		}
		defer closer()

		ctx := ReqContext(cctx)

		i, err := api.NetAutoNatStatus(ctx)
		if err != nil {
			return err
		}

		fmt.Println("AutoNAT status: ", i.Reachability.String())
		if i.PublicAddr != "" {
			fmt.Println("Public address: ", i.PublicAddr)
		}
		return nil
	},
}

var NetBandwidthCmd = &cli.Command{
	Name:  "bandwidth",
	Usage: "Print bandwidth usage information",
	Flags: []cli.Flag{
		&cli.BoolFlag{
			Name:  "by-peer",
			Usage: "list bandwidth usage by peer",
		},
		&cli.BoolFlag{
			Name:  "by-protocol",
			Usage: "list bandwidth usage by protocol",
		},
	},
	Action: func(cctx *cli.Context) error {
		api, closer, err := GetAPI(cctx)
		if err != nil {
			return err
		}
		defer closer()

		ctx := ReqContext(cctx)

		bypeer := cctx.Bool("by-peer")
		byproto := cctx.Bool("by-protocol")

		tw := tabwriter.NewWriter(os.Stdout, 4, 4, 2, ' ', 0)

		fmt.Fprintf(tw, "Segment\tTotalIn\tTotalOut\tRateIn\tRateOut\n")

		if bypeer {
			bw, err := api.NetBandwidthStatsByPeer(ctx)
			if err != nil {
				return err
			}

			var peers []string
			for p := range bw {
				peers = append(peers, p)
			}

			sort.Slice(peers, func(i, j int) bool {
				return peers[i] < peers[j]
			})

			for _, p := range peers {
				s := bw[p]
				fmt.Fprintf(tw, "%s\t%s\t%s\t%s/s\t%s/s\n", p, humanize.Bytes(uint64(s.TotalIn)), humanize.Bytes(uint64(s.TotalOut)), humanize.Bytes(uint64(s.RateIn)), humanize.Bytes(uint64(s.RateOut)))
			}
		} else if byproto {
			bw, err := api.NetBandwidthStatsByProtocol(ctx)
			if err != nil {
				return err
			}

			var protos []protocol.ID
			for p := range bw {
				protos = append(protos, p)
			}

			sort.Slice(protos, func(i, j int) bool {
				return protos[i] < protos[j]
			})

			for _, p := range protos {
				s := bw[p]
				if p == "" {
					p = "<unknown>"
				}
				fmt.Fprintf(tw, "%s\t%s\t%s\t%s/s\t%s/s\n", p, humanize.Bytes(uint64(s.TotalIn)), humanize.Bytes(uint64(s.TotalOut)), humanize.Bytes(uint64(s.RateIn)), humanize.Bytes(uint64(s.RateOut)))
			}
		} else {

			s, err := api.NetBandwidthStats(ctx)
			if err != nil {
				return err
			}

			fmt.Fprintf(tw, "Total\t%s\t%s\t%s/s\t%s/s\n", humanize.Bytes(uint64(s.TotalIn)), humanize.Bytes(uint64(s.TotalOut)), humanize.Bytes(uint64(s.RateIn)), humanize.Bytes(uint64(s.RateOut)))
		}

		return tw.Flush()

	},
}