package main

import (
	"errors"
	"fmt"
	"strconv"
	"time"

	"github.com/thrasher-corp/gocryptotrader/common"
	"github.com/thrasher-corp/gocryptotrader/currency"
	"github.com/thrasher-corp/gocryptotrader/gctrpc"
	"github.com/urfave/cli/v2"
)

var tradeCommand = &cli.Command{
	Name:      "trade",
	Usage:     "execute trade related commands",
	ArgsUsage: "<command> <args>",
	Subcommands: []*cli.Command{
		{
			Name:      "setexchangetradeprocessing",
			Usage:     "sets whether an exchange can save trades to the database",
			ArgsUsage: "<exchange> <status>",
			Action:    setExchangeTradeProcessing,
			Flags: []cli.Flag{
				&cli.StringFlag{
					Name:    "exchange",
					Aliases: []string{"e"},
					Usage:   "the exchange to change the status of",
				},
				&cli.BoolFlag{
					Name:  "status",
					Usage: "<true>/<false>",
				},
			},
		},
		{
			Name:      "getrecent",
			Usage:     "gets recent trades",
			ArgsUsage: "<exchange> <pair> <asset>",
			Action:    getRecentTrades,
			Flags: []cli.Flag{
				&cli.StringFlag{
					Name:    "exchange",
					Aliases: []string{"e"},
					Usage:   "the exchange to get the trades from",
				},
				&cli.StringFlag{
					Name:    "pair",
					Aliases: []string{"p"},
					Usage:   "the currency pair to get the trades for",
				},
				&cli.StringFlag{
					Name:    "asset",
					Aliases: []string{"a"},
					Usage:   "the asset type of the currency pair",
				},
			},
		},
		{
			Name:      "gethistoric",
			Usage:     "gets trades between two periods",
			ArgsUsage: "<exchange> <pair> <asset> <start> <end>",
			Action:    getHistoricTrades,
			Flags: []cli.Flag{
				&cli.StringFlag{
					Name:    "exchange",
					Aliases: []string{"e"},
					Usage:   "the exchange to get the trades from",
				},
				&cli.StringFlag{
					Name:    "pair",
					Aliases: []string{"p"},
					Usage:   "the currency pair to get the trades for",
				},
				&cli.StringFlag{
					Name:    "asset",
					Aliases: []string{"a"},
					Usage:   "the asset type of the currency pair",
				},
				&cli.StringFlag{
					Name:        "start",
					Usage:       "<start>",
					Value:       time.Now().Add(-time.Hour * 6).Format(common.SimpleTimeFormat),
					Destination: &startTime,
				},
				&cli.StringFlag{
					Name:        "end",
					Usage:       "<end> WARNING: large date ranges may take considerable time",
					Value:       time.Now().Format(common.SimpleTimeFormat),
					Destination: &endTime,
				},
			},
		},
		{
			Name:      "getsaved",
			Usage:     "gets trades from the database",
			ArgsUsage: "<exchange> <pair> <asset> <start> <end>",
			Action:    getSavedTrades,
			Flags: []cli.Flag{
				&cli.StringFlag{
					Name:    "exchange",
					Aliases: []string{"e"},
					Usage:   "the exchange to get the trades from",
				},
				&cli.StringFlag{
					Name:    "pair",
					Aliases: []string{"p"},
					Usage:   "the currency pair to get the trades for",
				},
				&cli.StringFlag{
					Name:    "asset",
					Aliases: []string{"a"},
					Usage:   "the asset type of the currency pair",
				},
				&cli.StringFlag{
					Name:        "start",
					Usage:       "<start>",
					Value:       time.Now().AddDate(0, -1, 0).Format(common.SimpleTimeFormat),
					Destination: &startTime,
				},
				&cli.StringFlag{
					Name:        "end",
					Usage:       "<end>",
					Value:       time.Now().Format(common.SimpleTimeFormat),
					Destination: &endTime,
				},
			},
		},
		{
			Name:      "findmissingsavedtradeintervals",
			Usage:     "will highlight any interval that is missing trade data so you can fill that gap",
			ArgsUsage: "<exchange> <pair> <asset> <start> <end>",
			Action:    findMissingSavedTradeIntervals,
			Flags: []cli.Flag{
				&cli.StringFlag{
					Name:    "exchange",
					Aliases: []string{"e"},
					Usage:   "the exchange to find the missing trades",
				},
				&cli.StringFlag{
					Name:    "pair",
					Aliases: []string{"p"},
					Usage:   "the currency pair",
				},
				&cli.StringFlag{
					Name:    "asset",
					Aliases: []string{"a"},
					Usage:   "the asset type of the currency pair",
				},
				&cli.StringFlag{
					Name:        "start",
					Usage:       "<start> rounded down to the nearest hour",
					Value:       time.Now().Add(-time.Hour * 24).Truncate(time.Hour).Format(common.SimpleTimeFormat),
					Destination: &startTime,
				},
				&cli.StringFlag{
					Name:        "end",
					Usage:       "<end> rounded down to the nearest hour",
					Value:       time.Now().Truncate(time.Hour).Format(common.SimpleTimeFormat),
					Destination: &endTime,
				},
			},
		},
		{
			Name:      "convertsavedtradestocandles",
			Usage:     "explicitly converts stored trade data to candles and saves the result to the database",
			ArgsUsage: "<exchange> <pair> <asset> <interval> <start> <end>",
			Action:    convertSavedTradesToCandles,
			Flags: []cli.Flag{
				&cli.StringFlag{
					Name:    "exchange",
					Aliases: []string{"e"},
					Usage:   "the exchange",
				},
				&cli.StringFlag{
					Name:    "pair",
					Aliases: []string{"p"},
					Usage:   "the currency pair to get the trades for",
				},
				&cli.StringFlag{
					Name:    "asset",
					Aliases: []string{"a"},
					Usage:   "the asset type of the currency pair",
				},
				&cli.Int64Flag{
					Name:        "interval",
					Aliases:     []string{"i"},
					Usage:       klineMessage,
					Value:       86400,
					Destination: &candleGranularity,
				},
				&cli.StringFlag{
					Name:        "start",
					Usage:       "<start>",
					Value:       time.Now().AddDate(0, -1, 0).Format(common.SimpleTimeFormat),
					Destination: &startTime,
				},
				&cli.StringFlag{
					Name:        "end",
					Usage:       "<end>",
					Value:       time.Now().Format(common.SimpleTimeFormat),
					Destination: &endTime,
				},
				&cli.BoolFlag{
					Name:    "sync",
					Aliases: []string{"s"},
					Usage:   "will sync the resulting candles to the database <true/false>",
				},
				&cli.BoolFlag{
					Name:    "force",
					Aliases: []string{"f"},
					Usage:   "will overwrite any conflicting candle data on save <true/false>",
				},
			},
		},
	},
}

func findMissingSavedTradeIntervals(c *cli.Context) error {
	if c.NArg() == 0 && c.NumFlags() == 0 {
		return cli.ShowSubcommandHelp(c)
	}

	var exchangeName string
	if c.IsSet("exchange") {
		exchangeName = c.String("exchange")
	} else {
		exchangeName = c.Args().First()
	}
	var currencyPair string
	if c.IsSet("pair") {
		currencyPair = c.String("pair")
	} else {
		currencyPair = c.Args().Get(1)
	}
	if !validPair(currencyPair) {
		return errInvalidPair
	}

	p, err := currency.NewPairDelimiter(currencyPair, pairDelimiter)
	if err != nil {
		return err
	}

	var assetType string
	if c.IsSet("asset") {
		assetType = c.String("asset")
	} else {
		assetType = c.Args().Get(2)
	}

	if !validAsset(assetType) {
		return errInvalidAsset
	}

	if !c.IsSet("start") {
		if c.Args().Get(3) != "" {
			startTime = c.Args().Get(3)
		}
	}

	if !c.IsSet("end") {
		if c.Args().Get(4) != "" {
			endTime = c.Args().Get(4)
		}
	}

	var s, e time.Time
	s, err = time.ParseInLocation(common.SimpleTimeFormat, startTime, time.Local)
	if err != nil {
		return fmt.Errorf("invalid time format for start: %v", err)
	}
	e, err = time.ParseInLocation(common.SimpleTimeFormat, endTime, time.Local)
	if err != nil {
		return fmt.Errorf("invalid time format for end: %v", err)
	}

	conn, cancel, err := setupClient(c)
	if err != nil {
		return err
	}
	defer closeConn(conn, cancel)

	client := gctrpc.NewGoCryptoTraderServiceClient(conn)
	result, err := client.FindMissingSavedTradeIntervals(c.Context,
		&gctrpc.FindMissingTradePeriodsRequest{
			ExchangeName: exchangeName,
			Pair: &gctrpc.CurrencyPair{
				Delimiter: p.Delimiter,
				Base:      p.Base.String(),
				Quote:     p.Quote.String(),
			},
			AssetType: assetType,
			Start:     s.Format(common.SimpleTimeFormatWithTimezone),
			End:       e.Format(common.SimpleTimeFormatWithTimezone),
		})
	if err != nil {
		return err
	}

	jsonOutput(result)
	return nil
}

func setExchangeTradeProcessing(c *cli.Context) error {
	if c.NArg() == 0 && c.NumFlags() == 0 {
		return cli.ShowSubcommandHelp(c)
	}

	var exchangeName string
	if c.IsSet("exchange") {
		exchangeName = c.String("exchange")
	} else {
		exchangeName = c.Args().First()
	}
	var status bool
	if c.IsSet("status") {
		status = c.Bool("status")
	} else {
		statusStr := c.Args().Get(1)
		var err error
		status, err = strconv.ParseBool(statusStr)
		if err != nil {
			return err
		}
	}

	conn, cancel, err := setupClient(c)
	if err != nil {
		return err
	}
	defer closeConn(conn, cancel)

	client := gctrpc.NewGoCryptoTraderServiceClient(conn)
	result, err := client.SetExchangeTradeProcessing(c.Context,
		&gctrpc.SetExchangeTradeProcessingRequest{
			Exchange: exchangeName,
			Status:   status,
		})
	if err != nil {
		return err
	}

	jsonOutput(result)
	return nil
}

func getSavedTrades(c *cli.Context) error {
	if c.NArg() == 0 && c.NumFlags() == 0 {
		return cli.ShowSubcommandHelp(c)
	}

	var exchangeName string
	if c.IsSet("exchange") {
		exchangeName = c.String("exchange")
	} else {
		exchangeName = c.Args().First()
	}
	var currencyPair string
	if c.IsSet("pair") {
		currencyPair = c.String("pair")
	} else {
		currencyPair = c.Args().Get(1)
	}
	if !validPair(currencyPair) {
		return errInvalidPair
	}

	p, err := currency.NewPairDelimiter(currencyPair, pairDelimiter)
	if err != nil {
		return err
	}

	var assetType string
	if c.IsSet("asset") {
		assetType = c.String("asset")
	} else {
		assetType = c.Args().Get(2)
	}

	if !validAsset(assetType) {
		return errInvalidAsset
	}

	if !c.IsSet("start") {
		if c.Args().Get(3) != "" {
			startTime = c.Args().Get(3)
		}
	}

	if !c.IsSet("end") {
		if c.Args().Get(4) != "" {
			endTime = c.Args().Get(4)
		}
	}

	var s, e time.Time
	s, err = time.ParseInLocation(common.SimpleTimeFormat, startTime, time.Local)
	if err != nil {
		return fmt.Errorf("invalid time format for start: %v", err)
	}
	e, err = time.ParseInLocation(common.SimpleTimeFormat, endTime, time.Local)
	if err != nil {
		return fmt.Errorf("invalid time format for end: %v", err)
	}

	if e.Before(s) {
		return errors.New("start cannot be after end")
	}

	conn, cancel, err := setupClient(c)
	if err != nil {
		return err
	}
	defer closeConn(conn, cancel)

	client := gctrpc.NewGoCryptoTraderServiceClient(conn)
	result, err := client.GetSavedTrades(c.Context,
		&gctrpc.GetSavedTradesRequest{
			Exchange: exchangeName,
			Pair: &gctrpc.CurrencyPair{
				Delimiter: p.Delimiter,
				Base:      p.Base.String(),
				Quote:     p.Quote.String(),
			},
			AssetType: assetType,
			Start:     s.Format(common.SimpleTimeFormatWithTimezone),
			End:       e.Format(common.SimpleTimeFormatWithTimezone),
		})
	if err != nil {
		return err
	}

	jsonOutput(result)
	return nil
}

func getRecentTrades(c *cli.Context) error {
	if c.NArg() == 0 && c.NumFlags() == 0 {
		return cli.ShowSubcommandHelp(c)
	}

	var exchangeName string
	if c.IsSet("exchange") {
		exchangeName = c.String("exchange")
	} else {
		exchangeName = c.Args().First()
	}
	var currencyPair string
	if c.IsSet("pair") {
		currencyPair = c.String("pair")
	} else {
		currencyPair = c.Args().Get(1)
	}
	if !validPair(currencyPair) {
		return errInvalidPair
	}

	p, err := currency.NewPairDelimiter(currencyPair, pairDelimiter)
	if err != nil {
		return err
	}

	var assetType string
	if c.IsSet("asset") {
		assetType = c.String("asset")
	} else {
		assetType = c.Args().Get(2)
	}

	if !validAsset(assetType) {
		return errInvalidAsset
	}

	conn, cancel, err := setupClient(c)
	if err != nil {
		return err
	}
	defer closeConn(conn, cancel)

	client := gctrpc.NewGoCryptoTraderServiceClient(conn)
	result, err := client.GetRecentTrades(c.Context,
		&gctrpc.GetSavedTradesRequest{
			Exchange: exchangeName,
			Pair: &gctrpc.CurrencyPair{
				Delimiter: p.Delimiter,
				Base:      p.Base.String(),
				Quote:     p.Quote.String(),
			},
			AssetType: assetType,
		})
	if err != nil {
		return err
	}

	jsonOutput(result)
	return nil
}

func getHistoricTrades(c *cli.Context) error {
	if c.NArg() == 0 && c.NumFlags() == 0 {
		return cli.ShowSubcommandHelp(c)
	}

	var exchangeName string
	if c.IsSet("exchange") {
		exchangeName = c.String("exchange")
	} else {
		exchangeName = c.Args().First()
	}
	var currencyPair string
	if c.IsSet("pair") {
		currencyPair = c.String("pair")
	} else {
		currencyPair = c.Args().Get(1)
	}
	if !validPair(currencyPair) {
		return errInvalidPair
	}

	p, err := currency.NewPairDelimiter(currencyPair, pairDelimiter)
	if err != nil {
		return err
	}

	var assetType string
	if c.IsSet("asset") {
		assetType = c.String("asset")
	} else {
		assetType = c.Args().Get(2)
	}

	if !validAsset(assetType) {
		return errInvalidAsset
	}

	if !c.IsSet("start") {
		if c.Args().Get(3) != "" {
			startTime = c.Args().Get(3)
		}
	}

	if !c.IsSet("end") {
		if c.Args().Get(4) != "" {
			endTime = c.Args().Get(4)
		}
	}
	var s, e time.Time
	s, err = time.ParseInLocation(common.SimpleTimeFormat, startTime, time.Local)
	if err != nil {
		return fmt.Errorf("invalid time format for start: %v", err)
	}
	e, err = time.ParseInLocation(common.SimpleTimeFormat, endTime, time.Local)
	if err != nil {
		return fmt.Errorf("invalid time format for end: %v", err)
	}

	if e.Before(s) {
		return errors.New("start cannot be after end")
	}

	conn, cancel, err := setupClient(c)
	if err != nil {
		return err
	}
	defer closeConn(conn, cancel)

	streamStartTime := time.Now()
	client := gctrpc.NewGoCryptoTraderServiceClient(conn)
	result, err := client.GetHistoricTrades(c.Context,
		&gctrpc.GetSavedTradesRequest{
			Exchange: exchangeName,
			Pair: &gctrpc.CurrencyPair{
				Delimiter: p.Delimiter,
				Base:      p.Base.String(),
				Quote:     p.Quote.String(),
			},
			AssetType: assetType,
			Start:     s.Format(common.SimpleTimeFormatWithTimezone),
			End:       e.Format(common.SimpleTimeFormatWithTimezone),
		})
	if err != nil {
		return err
	}
	fmt.Printf("%v\t| Beginning stream retrieving trades in 1 hour batches from %v to %v\n",
		time.Now().Format(time.Kitchen),
		s.UTC().Format(common.SimpleTimeFormatWithTimezone),
		e.UTC().Format(common.SimpleTimeFormatWithTimezone))
	fmt.Printf("%v\t| If you have provided a large time range, please be patient\n\n",
		time.Now().Format(time.Kitchen))
	for {
		resp, err := result.Recv()
		if err != nil {
			return err
		}
		if len(resp.Trades) == 0 {
			break
		}
		fmt.Printf("%v\t| Processed %v trades between %v and %v\n",
			time.Now().Format(time.Kitchen),
			len(resp.Trades),
			resp.Trades[0].Timestamp,
			resp.Trades[len(resp.Trades)-1].Timestamp)
	}

	fmt.Printf("%v\t| Trade retrieval complete! Process took %v\n",
		time.Now().Format(time.Kitchen),
		time.Since(streamStartTime))

	return nil
}

func convertSavedTradesToCandles(c *cli.Context) error {
	if c.NArg() == 0 && c.NumFlags() == 0 {
		return cli.ShowSubcommandHelp(c)
	}

	var exchangeName string
	if c.IsSet("exchange") {
		exchangeName = c.String("exchange")
	} else {
		exchangeName = c.Args().First()
	}
	var currencyPair string
	if c.IsSet("pair") {
		currencyPair = c.String("pair")
	} else {
		currencyPair = c.Args().Get(1)
	}
	if !validPair(currencyPair) {
		return errInvalidPair
	}

	p, err := currency.NewPairDelimiter(currencyPair, pairDelimiter)
	if err != nil {
		return err
	}

	var assetType string
	if c.IsSet("asset") {
		assetType = c.String("asset")
	} else {
		assetType = c.Args().Get(2)
	}

	if !validAsset(assetType) {
		return errInvalidAsset
	}

	if c.IsSet("interval") {
		candleGranularity = c.Int64("interval")
	} else if c.Args().Get(3) != "" {
		candleGranularity, err = strconv.ParseInt(c.Args().Get(3), 10, 64)
		if err != nil {
			return err
		}
	}

	if !c.IsSet("start") {
		if c.Args().Get(4) != "" {
			startTime = c.Args().Get(4)
		}
	}

	if !c.IsSet("end") {
		if c.Args().Get(5) != "" {
			endTime = c.Args().Get(5)
		}
	}

	var sync bool
	if c.IsSet("sync") {
		sync = c.Bool("sync")
	}

	var force bool
	if c.IsSet("force") {
		force = c.Bool("force")
	}

	if force && !sync {
		return errors.New("cannot forcefully overwrite without sync")
	}

	candleInterval := time.Duration(candleGranularity) * time.Second
	var s, e time.Time
	s, err = time.ParseInLocation(common.SimpleTimeFormat, startTime, time.Local)
	if err != nil {
		return fmt.Errorf("invalid time format for start: %v", err)
	}
	e, err = time.ParseInLocation(common.SimpleTimeFormat, endTime, time.Local)
	if err != nil {
		return fmt.Errorf("invalid time format for end: %v", err)
	}

	if e.Before(s) {
		return errors.New("start cannot be after end")
	}

	conn, cancel, err := setupClient(c)
	if err != nil {
		return err
	}
	defer closeConn(conn, cancel)

	client := gctrpc.NewGoCryptoTraderServiceClient(conn)
	result, err := client.ConvertTradesToCandles(c.Context,
		&gctrpc.ConvertTradesToCandlesRequest{
			Exchange: exchangeName,
			Pair: &gctrpc.CurrencyPair{
				Delimiter: p.Delimiter,
				Base:      p.Base.String(),
				Quote:     p.Quote.String(),
			},
			AssetType:    assetType,
			Start:        s.Format(common.SimpleTimeFormatWithTimezone),
			End:          e.Format(common.SimpleTimeFormatWithTimezone),
			TimeInterval: int64(candleInterval),
			Sync:         sync,
			Force:        force,
		})
	if err != nil {
		return err
	}

	jsonOutput(result)
	return nil
}