// Package beacon-chain defines the entire runtime of an eth2 beacon node.
package main

import (
	"fmt"
	"os"
	"path/filepath"
	"runtime"
	runtimeDebug "runtime/debug"

	gethlog "github.com/ethereum/go-ethereum/log"
	golog "github.com/ipfs/go-log/v2"
	joonix "github.com/joonix/log"
	"github.com/prysmaticlabs/prysm/beacon-chain/db"
	"github.com/prysmaticlabs/prysm/beacon-chain/flags"
	"github.com/prysmaticlabs/prysm/beacon-chain/node"
	"github.com/prysmaticlabs/prysm/shared/cmd"
	"github.com/prysmaticlabs/prysm/shared/debug"
	"github.com/prysmaticlabs/prysm/shared/featureconfig"
	"github.com/prysmaticlabs/prysm/shared/fileutil"
	"github.com/prysmaticlabs/prysm/shared/journald"
	"github.com/prysmaticlabs/prysm/shared/logutil"
	_ "github.com/prysmaticlabs/prysm/shared/maxprocs"
	"github.com/prysmaticlabs/prysm/shared/tos"
	"github.com/prysmaticlabs/prysm/shared/version"
	"github.com/sirupsen/logrus"
	"github.com/urfave/cli/v2"
	prefixed "github.com/x-cray/logrus-prefixed-formatter"
)

var appFlags = []cli.Flag{
	flags.DepositContractFlag,
	flags.HTTPWeb3ProviderFlag,
	flags.FallbackWeb3ProviderFlag,
	flags.RPCHost,
	flags.RPCPort,
	flags.CertFlag,
	flags.KeyFlag,
	flags.DisableGRPCGateway,
	flags.GRPCGatewayHost,
	flags.GRPCGatewayPort,
	flags.GPRCGatewayCorsDomain,
	flags.MinSyncPeers,
	flags.ContractDeploymentBlock,
	flags.SetGCPercent,
	flags.HeadSync,
	flags.DisableSync,
	flags.DisableDiscv5,
	flags.BlockBatchLimit,
	flags.BlockBatchLimitBurstFactor,
	flags.InteropMockEth1DataVotesFlag,
	flags.InteropGenesisStateFlag,
	flags.InteropNumValidatorsFlag,
	flags.InteropGenesisTimeFlag,
	flags.SlotsPerArchivedPoint,
	flags.EnableDebugRPCEndpoints,
	flags.SubscribeToAllSubnets,
	flags.HistoricalSlasherNode,
	flags.ChainID,
	flags.NetworkID,
	flags.WeakSubjectivityCheckpt,
	flags.Eth1HeaderReqLimit,
	cmd.EnableBackupWebhookFlag,
	cmd.BackupWebhookOutputDir,
	cmd.MinimalConfigFlag,
	cmd.E2EConfigFlag,
	cmd.RPCMaxPageSizeFlag,
	cmd.BootstrapNode,
	cmd.NoDiscovery,
	cmd.StaticPeers,
	cmd.RelayNode,
	cmd.P2PUDPPort,
	cmd.P2PTCPPort,
	cmd.P2PIP,
	cmd.P2PHost,
	cmd.P2PHostDNS,
	cmd.P2PMaxPeers,
	cmd.P2PPrivKey,
	cmd.P2PMetadata,
	cmd.P2PAllowList,
	cmd.P2PDenyList,
	cmd.DataDirFlag,
	cmd.VerbosityFlag,
	cmd.EnableTracingFlag,
	cmd.TracingProcessNameFlag,
	cmd.TracingEndpointFlag,
	cmd.TraceSampleFractionFlag,
	cmd.MonitoringHostFlag,
	flags.MonitoringPortFlag,
	cmd.DisableMonitoringFlag,
	cmd.ClearDB,
	cmd.ForceClearDB,
	cmd.LogFormat,
	cmd.MaxGoroutines,
	debug.PProfFlag,
	debug.PProfAddrFlag,
	debug.PProfPortFlag,
	debug.MemProfileRateFlag,
	debug.CPUProfileFlag,
	debug.TraceFlag,
	cmd.LogFileName,
	cmd.EnableUPnPFlag,
	cmd.ConfigFileFlag,
	cmd.ChainConfigFileFlag,
	cmd.GrpcMaxCallRecvMsgSizeFlag,
	cmd.AcceptTosFlag,
	cmd.RestoreSourceFileFlag,
	cmd.RestoreTargetDirFlag,
}

func init() {
	appFlags = cmd.WrapFlags(append(appFlags, featureconfig.BeaconChainFlags...))
}

func main() {
	log := logrus.WithField("prefix", "main")
	app := cli.App{}
	app.Name = "beacon-chain"
	app.Usage = "this is a beacon chain implementation for Ethereum 2.0"
	app.Action = startNode
	app.Version = version.GetVersion()
	app.Commands = []*cli.Command{
		db.DatabaseCommands,
	}

	app.Flags = appFlags

	app.Before = func(ctx *cli.Context) error {
		// Load flags from config file, if specified.
		if err := cmd.LoadFlagsFromConfig(ctx, app.Flags); err != nil {
			return err
		}

		format := ctx.String(cmd.LogFormat.Name)
		switch format {
		case "text":
			formatter := new(prefixed.TextFormatter)
			formatter.TimestampFormat = "2006-01-02 15:04:05"
			formatter.FullTimestamp = true
			// If persistent log files are written - we disable the log messages coloring because
			// the colors are ANSI codes and seen as gibberish in the log files.
			formatter.DisableColors = ctx.String(cmd.LogFileName.Name) != ""
			logrus.SetFormatter(formatter)
		case "fluentd":
			f := joonix.NewFormatter()
			if err := joonix.DisableTimestampFormat(f); err != nil {
				panic(err)
			}
			logrus.SetFormatter(f)
		case "json":
			logrus.SetFormatter(&logrus.JSONFormatter{})
		case "journald":
			if err := journald.Enable(); err != nil {
				return err
			}
		default:
			return fmt.Errorf("unknown log format %s", format)
		}

		logFileName := ctx.String(cmd.LogFileName.Name)
		if logFileName != "" {
			if err := logutil.ConfigurePersistentLogging(logFileName); err != nil {
				log.WithError(err).Error("Failed to configuring logging to disk.")
			}
		}
		if err := cmd.ExpandSingleEndpointIfFile(ctx, flags.HTTPWeb3ProviderFlag); err != nil {
			return err
		}
		if err := cmd.ExpandWeb3EndpointsIfFile(ctx, flags.FallbackWeb3ProviderFlag); err != nil {
			return err
		}
		if ctx.IsSet(flags.SetGCPercent.Name) {
			runtimeDebug.SetGCPercent(ctx.Int(flags.SetGCPercent.Name))
		}
		runtime.GOMAXPROCS(runtime.NumCPU())
		return debug.Setup(ctx)
	}

	defer func() {
		if x := recover(); x != nil {
			log.Errorf("Runtime panic: %v\n%v", x, string(runtimeDebug.Stack()))
			panic(x)
		}
	}()

	if err := app.Run(os.Args); err != nil {
		log.Error(err.Error())
	}
}

func startNode(ctx *cli.Context) error {
	// Fix data dir for Windows users.
	outdatedDataDir := filepath.Join(fileutil.HomeDir(), "AppData", "Roaming", "Eth2")
	currentDataDir := ctx.String(cmd.DataDirFlag.Name)
	if err := cmd.FixDefaultDataDir(outdatedDataDir, currentDataDir); err != nil {
		return err
	}

	// verify if ToS accepted
	if err := tos.VerifyTosAcceptedOrPrompt(ctx); err != nil {
		return err
	}

	verbosity := ctx.String(cmd.VerbosityFlag.Name)
	level, err := logrus.ParseLevel(verbosity)
	if err != nil {
		return err
	}
	logrus.SetLevel(level)
	if level == logrus.TraceLevel {
		// libp2p specific logging.
		golog.SetAllLoggers(golog.LevelDebug)
		// Geth specific logging.
		glogger := gethlog.NewGlogHandler(gethlog.StreamHandler(os.Stderr, gethlog.TerminalFormat(true)))
		glogger.Verbosity(gethlog.LvlTrace)
		gethlog.Root().SetHandler(glogger)
	}

	beacon, err := node.NewBeaconNode(ctx)
	if err != nil {
		return err
	}
	beacon.Start()
	return nil
}