package main

import (
	"fmt"
	"os"
	"path"
	"time"

	"github.com/ledgerwatch/erigon-lib/common"
	"github.com/ledgerwatch/erigon-lib/direct"
	"github.com/ledgerwatch/erigon-lib/gointerfaces"
	"github.com/ledgerwatch/erigon-lib/gointerfaces/grpcutil"
	"github.com/ledgerwatch/erigon-lib/gointerfaces/remote"
	proto_sentry "github.com/ledgerwatch/erigon-lib/gointerfaces/sentry"
	"github.com/ledgerwatch/erigon-lib/kv/kvcache"
	"github.com/ledgerwatch/erigon-lib/kv/remotedb"
	"github.com/ledgerwatch/erigon-lib/kv/remotedbserver"
	"github.com/ledgerwatch/erigon-lib/txpool"
	"github.com/ledgerwatch/erigon-lib/txpool/txpooluitl"
	"github.com/ledgerwatch/erigon/cmd/rpcdaemon/rpcdaemontest"
	"github.com/ledgerwatch/erigon/cmd/utils"
	"github.com/ledgerwatch/erigon/common/paths"
	"github.com/ledgerwatch/erigon/ethdb/privateapi"
	"github.com/ledgerwatch/erigon/internal/debug"
	"github.com/ledgerwatch/log/v3"
	"github.com/spf13/cobra"
)

var (
	sentryAddr     []string // Address of the sentry <host>:<port>
	privateApiAddr string
	txpoolApiAddr  string
	datadir        string // Path to td working dir

	TLSCertfile string
	TLSCACert   string
	TLSKeyFile  string

	pendingPoolLimit int
	baseFeePoolLimit int
	queuedPoolLimit  int

	priceLimit uint64
	priceBump  uint64
)

func init() {
	utils.CobraFlags(rootCmd, append(debug.Flags, utils.MetricFlags...))
	rootCmd.Flags().StringSliceVar(&sentryAddr, "sentry.api.addr", []string{"localhost:9091"}, "comma separated sentry addresses '<host>:<port>,<host>:<port>'")
	rootCmd.Flags().StringVar(&privateApiAddr, "private.api.addr", "localhost:9090", "execution service <host>:<port>")
	rootCmd.Flags().StringVar(&txpoolApiAddr, "txpool.api.addr", "localhost:9094", "txpool service <host>:<port>")
	rootCmd.Flags().StringVar(&datadir, utils.DataDirFlag.Name, paths.DefaultDataDir(), utils.DataDirFlag.Usage)
	if err := rootCmd.MarkFlagDirname(utils.DataDirFlag.Name); err != nil {
		panic(err)
	}
	rootCmd.PersistentFlags().StringVar(&TLSCertfile, "tls.cert", "", "certificate for client side TLS handshake")
	rootCmd.PersistentFlags().StringVar(&TLSKeyFile, "tls.key", "", "key file for client side TLS handshake")
	rootCmd.PersistentFlags().StringVar(&TLSCACert, "tls.cacert", "", "CA certificate for client side TLS handshake")

	rootCmd.PersistentFlags().IntVar(&pendingPoolLimit, "txpool.globalslots", txpool.DefaultConfig.PendingSubPoolLimit, "Maximum number of executable transaction slots for all accounts")
	rootCmd.PersistentFlags().IntVar(&baseFeePoolLimit, "txpool.globalbasefeeeslots", txpool.DefaultConfig.BaseFeeSubPoolLimit, "Maximum number of non-executable transactions where only not enough baseFee")
	rootCmd.PersistentFlags().IntVar(&queuedPoolLimit, "txpool.globalqueue", txpool.DefaultConfig.QueuedSubPoolLimit, "Maximum number of non-executable transaction slots for all accounts")
	rootCmd.PersistentFlags().Uint64Var(&priceLimit, "txpool.pricelimit", txpool.DefaultConfig.MinFeeCap, "Minimum gas price (fee cap) limit to enforce for acceptance into the pool")
	rootCmd.PersistentFlags().Uint64Var(&priceLimit, "txpool.accountslots", txpool.DefaultConfig.AccountSlots, "Minimum number of executable transaction slots guaranteed per account")
	rootCmd.PersistentFlags().Uint64Var(&priceBump, "txpool.pricebump", txpool.DefaultConfig.PriceBump, "Price bump percentage to replace an already existing transaction")
}

var rootCmd = &cobra.Command{
	Use:   "sentry",
	Short: "Run p2p sentry",
	PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
		return debug.SetupCobra(cmd)
	},
	PersistentPostRun: func(cmd *cobra.Command, args []string) {
		debug.Exit()
	},
	RunE: func(cmd *cobra.Command, args []string) error {
		ctx := cmd.Context()
		creds, err := grpcutil.TLS(TLSCACert, TLSCertfile, TLSKeyFile)
		if err != nil {
			return fmt.Errorf("could not connect to remoteKv: %w", err)
		}
		coreConn, err := grpcutil.Connect(creds, privateApiAddr)
		if err != nil {
			return fmt.Errorf("could not connect to remoteKv: %w", err)
		}

		kvClient := remote.NewKVClient(coreConn)
		coreDB, err := remotedb.NewRemote(gointerfaces.VersionFromProto(remotedbserver.KvServiceAPIVersion), log.New(), kvClient).Open()
		if err != nil {
			return fmt.Errorf("could not connect to remoteKv: %w", err)
		}

		log.Info("TxPool started", "db", path.Join(datadir, "txpool"))

		sentryClients := make([]direct.SentryClient, len(sentryAddr))
		for i := range sentryAddr {
			creds, err := grpcutil.TLS(TLSCACert, TLSCertfile, TLSKeyFile)
			if err != nil {
				return fmt.Errorf("could not connect to sentry: %w", err)
			}
			sentryConn, err := grpcutil.Connect(creds, sentryAddr[i])
			if err != nil {
				return fmt.Errorf("could not connect to sentry: %w", err)
			}

			sentryClients[i] = direct.NewSentryClientRemote(proto_sentry.NewSentryClient(sentryConn))
		}

		cfg := txpool.DefaultConfig
		cfg.DBDir = path.Join(datadir, "txpool")
		cfg.LogEvery = 30 * time.Second
		cfg.CommitEvery = 30 * time.Second
		cfg.PendingSubPoolLimit = pendingPoolLimit
		cfg.BaseFeeSubPoolLimit = baseFeePoolLimit
		cfg.QueuedSubPoolLimit = queuedPoolLimit
		cfg.MinFeeCap = priceLimit
		cfg.PriceBump = priceBump

		cacheConfig := kvcache.DefaultCoherentConfig
		cacheConfig.MetricsLabel = "txpool"

		newTxs := make(chan txpool.Hashes, 1024)
		defer close(newTxs)
		txPoolDB, txPool, fetch, send, txpoolGrpcServer, err := txpooluitl.AllComponents(ctx, cfg,
			kvcache.New(cacheConfig), newTxs, coreDB, sentryClients, kvClient)
		if err != nil {
			return err
		}
		fetch.ConnectCore()
		fetch.ConnectSentries()

		/*
			var ethashApi *ethash.API
			sif casted, ok := backend.engine.(*ethash.Ethash); ok {
				ethashApi = casted.APIs(nil)[1].Service.(*ethash.API)
			}
		*/
		miningGrpcServer := privateapi.NewMiningServer(cmd.Context(), &rpcdaemontest.IsMiningMock{}, nil)

		grpcServer, err := txpool.StartGrpc(txpoolGrpcServer, miningGrpcServer, txpoolApiAddr, nil)
		if err != nil {
			return err
		}

		notifyMiner := func() {}
		txpool.MainLoop(cmd.Context(), txPoolDB, coreDB, txPool, newTxs, send, txpoolGrpcServer.NewSlotsStreams, notifyMiner)

		grpcServer.GracefulStop()
		return nil
	},
}

func main() {
	ctx, cancel := common.RootContext()
	defer cancel()

	if err := rootCmd.ExecuteContext(ctx); err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
}