package server

import (
	"fmt"
	"log"
	"os"
	"strconv"
	"strings"

	"github.com/akamensky/argparse"
	pb "github.com/lbryio/herald.go/protobuf/go"
	"github.com/lbryio/lbcd/chaincfg"
)

const (
	ServeCmd  = iota
	SearchCmd = iota
	DBCmd     = iota
)

// Args struct contains the arguments to the hub server.
type Args struct {
	CmdType             int
	Host                string
	Port                int
	DBPath              string
	Chain               *string
	EsHost              string
	EsPort              int
	PrometheusPort      int
	NotifierPort        int
	JSONRPCPort         int
	JSONRPCHTTPPort     int
	MaxSessions         int
	SessionTimeout      int
	EsIndex             string
	RefreshDelta        int
	CacheTTL            int
	PeerFile            string
	Banner              *string
	Country             string
	BlockingChannelIds  []string
	FilteringChannelIds []string

	GenesisHash       string
	ServerVersion     string
	ProtocolMin       string
	ProtocolMax       string
	ServerDescription string
	PaymentAddress    string
	DonationAddress   string
	DailyFee          string

	Debug                       bool
	DisableEs                   bool
	DisableLoadPeers            bool
	DisableStartPrometheus      bool
	DisableStartUDP             bool
	DisableWritePeers           bool
	DisableFederation           bool
	DisableRocksDBRefresh       bool
	DisableResolve              bool
	DisableBlockingAndFiltering bool
	DisableStartNotifier        bool
	DisableStartJSONRPC         bool
}

const (
	DefaultHost            = "0.0.0.0"
	DefaultPort            = 50051
	DefaultDBPath          = "/mnt/d/data/snapshot_1072108/lbry-rocksdb/" // FIXME
	DefaultEsHost          = "http://localhost"
	DefaultEsIndex         = "claims"
	DefaultEsPort          = 9200
	DefaultPrometheusPort  = 2112
	DefaultNotifierPort    = 18080
	DefaultJSONRPCPort     = 50001
	DefaultJSONRPCHTTPPort = 50002
	DefaultMaxSessions     = 10000
	DefaultSessionTimeout  = 300
	DefaultRefreshDelta    = 5
	DefaultCacheTTL        = 5
	DefaultPeerFile        = "peers.txt"
	DefaultBannerFile      = ""
	DefaultCountry         = "US"

	HUB_PROTOCOL_VERSION     = "0.107.0"
	PROTOCOL_MIN             = "0.54.0"
	PROTOCOL_MAX             = "0.199.0"
	DefaultServerDescription = "Herald"
	DefaultPaymentAddress    = ""
	DefaultDonationAddress   = ""
	DefaultDailyFee          = "1.0"

	DefaultDisableLoadPeers            = false
	DefaultDisableStartPrometheus      = false
	DefaultDisableStartUDP             = false
	DefaultDisableWritePeers           = false
	DefaultDisableFederation           = false
	DefaultDisableRockDBRefresh        = false
	DefaultDisableResolve              = false
	DefaultDisableBlockingAndFiltering = false
	DisableStartNotifier               = false
	DisableStartJSONRPC                = false
)

var (
	DefaultBlockingChannelIds  = []string{}
	DefaultFilteringChannelIds = []string{}
)

func loadBanner(bannerFile *string, serverVersion string) *string {
	var banner string

	data, err := os.ReadFile(*bannerFile)
	if err != nil {
		banner = fmt.Sprintf("You are connected to an %s server.", serverVersion)
	} else {
		banner = string(data)
	}

	/*
		banner := os.Getenv("BANNER")
		if banner == "" {
			return nil
		}
	*/

	return &banner
}

// MakeDefaultArgs creates a default set of arguments for testing the server.
func MakeDefaultTestArgs() *Args {
	args := &Args{
		CmdType:         ServeCmd,
		Host:            DefaultHost,
		Port:            DefaultPort,
		DBPath:          DefaultDBPath,
		EsHost:          DefaultEsHost,
		EsPort:          DefaultEsPort,
		PrometheusPort:  DefaultPrometheusPort,
		NotifierPort:    DefaultNotifierPort,
		JSONRPCPort:     DefaultJSONRPCPort,
		JSONRPCHTTPPort: DefaultJSONRPCHTTPPort,
		MaxSessions:     DefaultMaxSessions,
		SessionTimeout:  DefaultSessionTimeout,
		EsIndex:         DefaultEsIndex,
		RefreshDelta:    DefaultRefreshDelta,
		CacheTTL:        DefaultCacheTTL,
		PeerFile:        DefaultPeerFile,
		Banner:          nil,
		Country:         DefaultCountry,

		GenesisHash:       chaincfg.TestNet3Params.GenesisHash.String(),
		ServerVersion:     HUB_PROTOCOL_VERSION,
		ProtocolMin:       PROTOCOL_MIN,
		ProtocolMax:       PROTOCOL_MAX,
		ServerDescription: DefaultServerDescription,
		PaymentAddress:    DefaultPaymentAddress,
		DonationAddress:   DefaultDonationAddress,
		DailyFee:          DefaultDailyFee,

		DisableEs:                   true,
		Debug:                       true,
		DisableLoadPeers:            true,
		DisableStartPrometheus:      true,
		DisableStartUDP:             true,
		DisableWritePeers:           true,
		DisableRocksDBRefresh:       true,
		DisableResolve:              true,
		DisableBlockingAndFiltering: true,
		DisableStartNotifier:        true,
		DisableStartJSONRPC:         true,
	}

	return args
}

// GetEnvironment takes the environment variables as an array of strings
// and a getkeyval function to turn it into a map.
func GetEnvironment(data []string, getkeyval func(item string) (key, val string)) map[string]string {
	items := make(map[string]string)
	for _, item := range data {
		key, val := getkeyval(item)
		items[key] = val
	}
	return items
}

// GetEnvironmentStandard gets the environment variables as a map.
func GetEnvironmentStandard() map[string]string {
	return GetEnvironment(os.Environ(), func(item string) (key, val string) {
		splits := strings.Split(item, "=")
		key = splits[0]
		val = splits[1]
		return
	})
}

// ParseArgs parses the command line arguments when started the hub server.
func ParseArgs(searchRequest *pb.SearchRequest) *Args {

	environment := GetEnvironmentStandard()
	parser := argparse.NewParser("herald", "herald server and client")

	serveCmd := parser.NewCommand("serve", "start the hub server")
	searchCmd := parser.NewCommand("search", "claim search")
	dbCmd := parser.NewCommand("db", "db testing")

	validatePort := func(arg []string) error {
		_, err := strconv.ParseUint(arg[0], 10, 16)
		return err
	}

	// main server config arguments
	host := parser.String("", "rpchost", &argparse.Options{Required: false, Help: "RPC host", Default: DefaultHost})
	port := parser.Int("", "rpcport", &argparse.Options{Required: false, Help: "RPC port", Validate: validatePort, Default: DefaultPort})
	dbPath := parser.String("", "db-path", &argparse.Options{Required: false, Help: "RocksDB path", Default: DefaultDBPath})
	chain := parser.Selector("", "chain", []string{chaincfg.MainNetParams.Name, chaincfg.TestNet3Params.Name, chaincfg.RegressionNetParams.Name, "testnet"},
		&argparse.Options{Required: false, Help: "Which chain to use, default is 'mainnet'. Values 'regtest' and 'testnet' are for testing", Default: chaincfg.MainNetParams.Name})
	esHost := parser.String("", "eshost", &argparse.Options{Required: false, Help: "elasticsearch host", Default: DefaultEsHost})
	esPort := parser.Int("", "esport", &argparse.Options{Required: false, Help: "elasticsearch port", Default: DefaultEsPort})
	prometheusPort := parser.Int("", "prometheus-port", &argparse.Options{Required: false, Help: "prometheus port", Default: DefaultPrometheusPort})
	notifierPort := parser.Int("", "notifier-port", &argparse.Options{Required: false, Help: "notifier port", Default: DefaultNotifierPort})
	jsonRPCPort := parser.Int("", "json-rpc-port", &argparse.Options{Required: false, Help: "JSON RPC port", Validate: validatePort, Default: DefaultJSONRPCPort})
	jsonRPCHTTPPort := parser.Int("", "json-rpc-http-port", &argparse.Options{Required: false, Help: "JSON RPC over HTTP port", Validate: validatePort, Default: DefaultJSONRPCHTTPPort})
	maxSessions := parser.Int("", "max-sessions", &argparse.Options{Required: false, Help: "Maximum number of electrum clients that can be connected", Default: DefaultMaxSessions})
	sessionTimeout := parser.Int("", "session-timeout", &argparse.Options{Required: false, Help: "Session inactivity timeout (seconds)", Default: DefaultSessionTimeout})
	esIndex := parser.String("", "esindex", &argparse.Options{Required: false, Help: "elasticsearch index name", Default: DefaultEsIndex})
	refreshDelta := parser.Int("", "refresh-delta", &argparse.Options{Required: false, Help: "elasticsearch index refresh delta in seconds", Default: DefaultRefreshDelta})
	cacheTTL := parser.Int("", "cachettl", &argparse.Options{Required: false, Help: "Cache TTL in minutes", Default: DefaultCacheTTL})
	peerFile := parser.String("", "peerfile", &argparse.Options{Required: false, Help: "Initial peer file for federation", Default: DefaultPeerFile})
	bannerFile := parser.String("", "bannerfile", &argparse.Options{Required: false, Help: "Banner file server.banner", Default: DefaultBannerFile})
	country := parser.String("", "country", &argparse.Options{Required: false, Help: "Country this node is running in. Default US.", Default: DefaultCountry})
	blockingChannelIds := parser.StringList("", "blocking-channel-ids", &argparse.Options{Required: false, Help: "Blocking channel ids", Default: DefaultBlockingChannelIds})
	filteringChannelIds := parser.StringList("", "filtering-channel-ids", &argparse.Options{Required: false, Help: "Filtering channel ids", Default: DefaultFilteringChannelIds})

	// arguments for server features
	serverDescription := parser.String("", "server-description", &argparse.Options{Required: false, Help: "Server description", Default: DefaultServerDescription})
	paymentAddress := parser.String("", "payment-address", &argparse.Options{Required: false, Help: "Payment address", Default: DefaultPaymentAddress})
	donationAddress := parser.String("", "donation-address", &argparse.Options{Required: false, Help: "Donation address", Default: DefaultDonationAddress})
	dailyFee := parser.String("", "daily-fee", &argparse.Options{Required: false, Help: "Daily fee", Default: DefaultDailyFee})

	// flags for disabling features
	debug := parser.Flag("", "debug", &argparse.Options{Required: false, Help: "enable debug logging", Default: false})
	disableEs := parser.Flag("", "disable-es", &argparse.Options{Required: false, Help: "Disable elastic search, for running/testing independently", Default: false})
	disableLoadPeers := parser.Flag("", "disable-load-peers", &argparse.Options{Required: false, Help: "Disable load peers from disk at startup", Default: DefaultDisableLoadPeers})
	disableStartPrometheus := parser.Flag("", "disable-start-prometheus", &argparse.Options{Required: false, Help: "Disable start prometheus server", Default: DefaultDisableStartPrometheus})
	disableStartUdp := parser.Flag("", "disable-start-udp", &argparse.Options{Required: false, Help: "Disable start UDP ping server", Default: DefaultDisableStartUDP})
	disableWritePeers := parser.Flag("", "disable-write-peers", &argparse.Options{Required: false, Help: "Disable write peer to disk as we learn about them", Default: DefaultDisableWritePeers})
	disableFederation := parser.Flag("", "disable-federation", &argparse.Options{Required: false, Help: "Disable server federation", Default: DefaultDisableFederation})
	disableRocksDBRefresh := parser.Flag("", "disable-rocksdb-refresh", &argparse.Options{Required: false, Help: "Disable rocksdb refreshing", Default: DefaultDisableRockDBRefresh})
	disableResolve := parser.Flag("", "disable-resolve", &argparse.Options{Required: false, Help: "Disable resolve endpoint (and rocksdb loading)", Default: DefaultDisableRockDBRefresh})
	disableBlockingAndFiltering := parser.Flag("", "disable-blocking-and-filtering", &argparse.Options{Required: false, Help: "Disable blocking and filtering of channels and streams", Default: DefaultDisableBlockingAndFiltering})
	disableStartNotifier := parser.Flag("", "disable-start-notifier", &argparse.Options{Required: false, Help: "Disable start notifier", Default: DisableStartNotifier})
	disableStartJSONRPC := parser.Flag("", "disable-start-jsonrpc", &argparse.Options{Required: false, Help: "Disable start jsonrpc endpoint", Default: DisableStartJSONRPC})

	// search command arguments
	text := parser.String("", "text", &argparse.Options{Required: false, Help: "text query"})
	name := parser.String("", "name", &argparse.Options{Required: false, Help: "name"})
	claimType := parser.String("", "claim_type", &argparse.Options{Required: false, Help: "claim_type"})
	id := parser.String("", "id", &argparse.Options{Required: false, Help: "id"})
	author := parser.String("", "author", &argparse.Options{Required: false, Help: "author"})
	title := parser.String("", "title", &argparse.Options{Required: false, Help: "title"})
	description := parser.String("", "description", &argparse.Options{Required: false, Help: "description"})
	channelId := parser.String("", "channel_id", &argparse.Options{Required: false, Help: "channel id"})
	channelIds := parser.StringList("", "channel_ids", &argparse.Options{Required: false, Help: "channel ids"})

	// Now parse the arguments
	err := parser.Parse(os.Args)
	if err != nil {
		log.Fatalln(parser.Usage(err))
	}

	// Use default JSON RPC port only if *neither* JSON RPC arg is specified.
	if *jsonRPCPort == 0 && *jsonRPCHTTPPort == 0 {
		*jsonRPCPort = DefaultJSONRPCPort
	}

	banner := loadBanner(bannerFile, HUB_PROTOCOL_VERSION)

	args := &Args{
		CmdType:             SearchCmd,
		Host:                *host,
		Port:                *port,
		DBPath:              *dbPath,
		Chain:               chain,
		EsHost:              *esHost,
		EsPort:              *esPort,
		PrometheusPort:      *prometheusPort,
		NotifierPort:        *notifierPort,
		JSONRPCPort:         *jsonRPCPort,
		JSONRPCHTTPPort:     *jsonRPCHTTPPort,
		MaxSessions:         *maxSessions,
		SessionTimeout:      *sessionTimeout,
		EsIndex:             *esIndex,
		RefreshDelta:        *refreshDelta,
		CacheTTL:            *cacheTTL,
		PeerFile:            *peerFile,
		Banner:              banner,
		Country:             *country,
		BlockingChannelIds:  *blockingChannelIds,
		FilteringChannelIds: *filteringChannelIds,

		GenesisHash:       "",
		ServerVersion:     HUB_PROTOCOL_VERSION,
		ProtocolMin:       PROTOCOL_MIN,
		ProtocolMax:       PROTOCOL_MAX,
		ServerDescription: *serverDescription,
		PaymentAddress:    *paymentAddress,
		DonationAddress:   *donationAddress,
		DailyFee:          *dailyFee,

		Debug:                       *debug,
		DisableEs:                   *disableEs,
		DisableLoadPeers:            *disableLoadPeers,
		DisableStartPrometheus:      *disableStartPrometheus,
		DisableStartUDP:             *disableStartUdp,
		DisableWritePeers:           *disableWritePeers,
		DisableFederation:           *disableFederation,
		DisableRocksDBRefresh:       *disableRocksDBRefresh,
		DisableResolve:              *disableResolve,
		DisableBlockingAndFiltering: *disableBlockingAndFiltering,
		DisableStartNotifier:        *disableStartNotifier,
		DisableStartJSONRPC:         *disableStartJSONRPC,
	}

	if esHost, ok := environment["ELASTIC_HOST"]; ok {
		args.EsHost = esHost
	}

	if !strings.HasPrefix(args.EsHost, "http") {
		args.EsHost = "http://" + args.EsHost
	}

	if esPort, ok := environment["ELASTIC_PORT"]; ok {
		args.EsPort, err = strconv.Atoi(esPort)
		if err != nil {
			log.Fatal(err)
		}
	}

	if prometheusPort, ok := environment["GOHUB_PROMETHEUS_PORT"]; ok {
		args.PrometheusPort, err = strconv.Atoi(prometheusPort)
		if err != nil {
			log.Fatal(err)
		}
	}

	/*
	   Verify no invalid argument combinations
	*/
	if len(*channelIds) > 0 && *channelId != "" {
		log.Fatal("Cannot specify both channel_id and channel_ids")
	}

	if serveCmd.Happened() {
		args.CmdType = ServeCmd
	} else if searchCmd.Happened() {
		args.CmdType = SearchCmd
	} else if dbCmd.Happened() {
		args.CmdType = DBCmd
	}

	if *text != "" {
		searchRequest.Text = *text
	}
	if *name != "" {
		searchRequest.ClaimName = *name
	}
	if *claimType != "" {
		searchRequest.ClaimType = []string{*claimType}
	}
	if *id != "" {
		searchRequest.ClaimId = &pb.InvertibleField{Invert: false, Value: []string{*id}}
	}
	if *author != "" {
		searchRequest.Author = *author
	}
	if *title != "" {
		searchRequest.Title = *title
	}
	if *description != "" {
		searchRequest.Description = *description
	}
	if *channelId != "" {
		searchRequest.ChannelId = &pb.InvertibleField{Invert: false, Value: []string{*channelId}}
	}
	if len(*channelIds) > 0 {
		searchRequest.ChannelId = &pb.InvertibleField{Invert: false, Value: *channelIds}
	}

	return args
}