package server

import (
	"log"
	"os"
	"strings"

	"github.com/akamensky/argparse"
	pb "github.com/lbryio/hub/protobuf/go"
)

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

// Args struct contains the arguments to the hub server.
type Args struct {
	CmdType                int
	Host                   string
	Port                   string
	EsHost                 string
	EsPort                 string
	PrometheusPort         string
	EsIndex                string
	RefreshDelta           int
	CacheTTL               int
	PeerFile               string
	Country                string
	DisableEs              bool
	Debug                  bool
	DisableLoadPeers       bool
	DisableStartPrometheus bool
	DisableStartUDP        bool
	DisableWritePeers      bool
	DisableFederation      bool
}

const (
	DefaultHost                   = "0.0.0.0"
	DefaultPort                   = "50051"
	DefaultEsHost                 = "http://localhost"
	DefaultEsIndex                = "claims"
	DefaultEsPort                 = "9200"
	DefaultPrometheusPort         = "2112"
	DefaultRefreshDelta           = 5
	DefaultCacheTTL               = 5
	DefaultPeerFile               = "peers.txt"
	DefaultCountry                = "US"
	DefaultDisableLoadPeers       = false
	DefaultDisableStartPrometheus = false
	DefaultDisableStartUDP        = false
	DefaultDisableWritePeers      = false
	DefaultDisableFederation      = false
)

// 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("hub", "hub server and client")

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

	host := parser.String("", "rpchost", &argparse.Options{Required: false, Help: "RPC host", Default: DefaultHost})
	port := parser.String("", "rpcport", &argparse.Options{Required: false, Help: "RPC port", Default: DefaultPort})
	esHost := parser.String("", "eshost", &argparse.Options{Required: false, Help: "elasticsearch host", Default: DefaultEsHost})
	esPort := parser.String("", "esport", &argparse.Options{Required: false, Help: "elasticsearch port", Default: DefaultEsPort})
	prometheusPort := parser.String("", "prometheus-port", &argparse.Options{Required: false, Help: "prometheus port", Default: DefaultPrometheusPort})
	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})
	country := parser.String("", "country", &argparse.Options{Required: false, Help: "Country this node is running in. Default US.", Default: DefaultCountry})

	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})

	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))
	}

	args := &Args{
		CmdType:                SearchCmd,
		Host:                   *host,
		Port:                   *port,
		EsHost:                 *esHost,
		EsPort:                 *esPort,
		PrometheusPort:         *prometheusPort,
		EsIndex:                *esIndex,
		RefreshDelta:           *refreshDelta,
		CacheTTL:               *cacheTTL,
		PeerFile:               *peerFile,
		Country:                *country,
		DisableEs:              *disableEs,
		Debug:                  *debug,
		DisableLoadPeers:       *disableLoadPeers,
		DisableStartPrometheus: *disableStartPrometheus,
		DisableStartUDP:        *disableStartUdp,
		DisableWritePeers:      *disableWritePeers,
		DisableFederation:      *disableFederation,
	}

	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 = esPort
	}

	if prometheusPort, ok := environment["GOHUB_PROMETHEUS_PORT"]; ok {
		args.PrometheusPort = prometheusPort
	}

	/*
	   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
}