package copytrader

import (
	"context"
	"fmt"
	"github.com/c9s/bbgo/pkg/bbgo"
	"github.com/c9s/bbgo/pkg/types"
	"github.com/sirupsen/logrus"
)

const ID = "copytrader"

const stateKey = "state-v1"

var log = logrus.WithField("strategy", ID)

func init() {
	bbgo.RegisterStrategy(ID, &Strategy{})
}

type Strategy struct {
	*bbgo.Graceful
	*bbgo.Notifiability
	*bbgo.Persistence
	Environment *bbgo.Environment

	Symbol string `json:"symbol"`

	// SourceExchange session name
	SourceExchange string `json:"sourceExchange"`

	// FollowerExchange session name
	FollowerExchange map[string]string `json:"makerExchange"`

	followerSession map[string]*bbgo.ExchangeSession
	sourceSession   *bbgo.ExchangeSession

	Market types.Market
}

func (s *Strategy) ID() string {
	return ID
}

func (s *Strategy) InstanceID() string {
	return fmt.Sprintf("%s:%s", ID, s.Symbol)
}

//func (s *Strategy) CrossSubscribe(sessions map[string]*bbgo.ExchangeSession) {
//	sourceSession, ok := sessions[s.SourceExchange]
//	if !ok {
//		panic(fmt.Errorf("source session %s is not defined", s.SourceExchange))
//	}
//
//	sourceSession.Subscribe(types.BookChannel, s.Symbol, types.SubscribeOptions{})
//	sourceSession.Subscribe(types.KLineChannel, s.Symbol, types.SubscribeOptions{Interval: "1m"})
//
//	for _, v := range s.FollowerExchange {
//		makerSession, ok := sessions[v]
//		if !ok {
//			panic(fmt.Errorf("maker session %s is not defined", v))
//		}
//		makerSession.Subscribe(types.KLineChannel, s.Symbol, types.SubscribeOptions{Interval: "1m"})
//	}
//
//}

func (s *Strategy) CrossRun(ctx context.Context, orderExecutionRouter bbgo.OrderExecutionRouter, sessions map[string]*bbgo.ExchangeSession) error {
	//_ = s.Persistence.Sync(s)
	// configure sessions
	sourceSession, ok := sessions[s.SourceExchange]
	if !ok {
		return fmt.Errorf("source exchange session %s is not defined", s.SourceExchange)
	}

	s.sourceSession = sourceSession

	for k, v := range s.FollowerExchange {
		followerSession, ok := sessions[k]
		if !ok {
			panic(fmt.Errorf("maker exchange session %s is not defined", v))
		}
		s.followerSession[k] = followerSession

	}

	s.Market, ok = s.sourceSession.Market(s.Symbol)
	if !ok {
		return fmt.Errorf("source session market %s is not defined", s.Symbol)
	}

	//s.followerMarket, ok = s.sourceSession.Market(s.Symbol)
	//if !ok {
	//	return fmt.Errorf("maker session market %s is not defined", s.Symbol)
	//}

	// restore state
	//instanceID := s.InstanceID()
	//s.groupID = util.FNV32(instanceID)
	//log.Infof("using group id %d from fnv(%s)", s.groupID, instanceID)

	//s.book = types.NewStreamBook(s.Symbol)
	//s.book.BindStream(s.sourceSession.MarketDataStream)

	//for k, _ := range s.FollowerExchange {
	//	s.activeFollowerOrders[k] = bbgo.NewLocalActiveOrderBook(s.Symbol)
	//	s.activeFollowerOrders[k].BindStream(s.followerSession[k].UserDataStream)
	//	s.followerOrderStore[k] = bbgo.NewOrderStore(s.Symbol)
	//	s.followerOrderStore[k].BindStream(s.followerSession[k].UserDataStream)
	//}
	//
	//s.sourceOrderStore = bbgo.NewOrderStore(s.Symbol)
	//s.sourceOrderStore.BindStream(s.sourceSession.UserDataStream)
	// If position is nil, we need to allocate a new position for calculation
	//if s.Position == nil {
	//	s.Position = types.NewPositionFromMarket(s.Market)
	//}

	s.sourceSession.UserDataStream.OnOrderUpdate(func(order types.Order) {
		log.Infof("source order: %v", order)

		copyOrder := types.SubmitOrder{
			Symbol:   order.Symbol,
			Side:     order.Side,
			Type:     order.Type,
			Quantity: order.Quantity,
			Market:   order.Market,
		}
		log.Infof("copy order: %s", copyOrder)
		for k, _ := range s.FollowerExchange {
			createdOrders, err := s.followerSession[k].Exchange.SubmitOrders(ctx, copyOrder)
			if err != nil {
				log.WithError(err).Errorf("can not place  order")
			} else {
				log.Infof("submitted order: %s for ...", createdOrders)
			}
		}
	})

	//s.tradeCollector = bbgo.NewTradeCollector(s.Symbol, s.Position, s.orderStore)

	//if s.NotifyTrade {
	//	s.tradeCollector.OnTrade(func(trade types.Trade, profit, netProfit fixedpoint.Value) {
	//		s.Notifiability.Notify(trade)
	//	})
	//}

	//s.tradeCollector.OnTrade(func(trade types.Trade, profit, netProfit fixedpoint.Value) {
	//	c := trade.PositionChange()
	//	if trade.Exchange == s.sourceSession.ExchangeName {
	//		s.CoveredPosition = s.CoveredPosition.Add(c)
	//	}
	//
	//	s.ProfitStats.AddTrade(trade)
	//
	//	if profit.Compare(fixedpoint.Zero) == 0 {
	//		s.Environment.RecordPosition(s.Position, trade, nil)
	//	} else {
	//		log.Infof("%s generated profit: %v", s.Symbol, profit)
	//
	//		p := s.Position.NewProfit(trade, profit, netProfit)
	//		p.Strategy = ID
	//		p.StrategyInstanceID = instanceID
	//		s.Notify(&p)
	//		s.ProfitStats.AddProfit(p)
	//
	//		s.Environment.RecordPosition(s.Position, trade, &p)
	//	}
	//})

	//s.tradeCollector.OnPositionUpdate(func(position *types.Position) {
	//	s.Notifiability.Notify(position)
	//})
	//s.tradeCollector.OnRecover(func(trade types.Trade) {
	//	s.Notifiability.Notify("Recover trade", trade)
	//})
	//s.tradeCollector.BindStream(s.sourceSession.UserDataStream)
	//s.tradeCollector.BindStream(s.makerSession.UserDataStream)

	//go func() {

	//defer func() {
	//	if err := s.activeFollowerOrders.GracefulCancel(context.Background(),
	//		s.makerSession.Exchange); err != nil {
	//		log.WithError(err).Errorf("can not cancel %s orders", s.Symbol)
	//	}
	//}()

	//	for {
	//		select {
	//
	//		//case <-s.stopC:
	//		//	log.Warnf("%s maker goroutine stopped, due to the stop signal", s.Symbol)
	//		//	return
	//
	//		case <-ctx.Done():
	//			log.Warnf("%s maker goroutine stopped, due to the cancelled context", s.Symbol)
	//			return
	//
	//		case <-quoteTicker.C:
	//			s.updateQuote(ctx, orderExecutionRouter)
	//
	//		case <-reportTicker.C:
	//			s.Notifiability.Notify(&s.ProfitStats)
	//
	//		case <-tradeScanTicker.C:
	//			log.Infof("scanning trades from %s ago...", tradeScanInterval)
	//			startTime := time.Now().Add(-tradeScanInterval)
	//			if err := s.tradeCollector.Recover(ctx, s.sourceSession.Exchange.(types.ExchangeTradeHistoryService), s.Symbol, startTime); err != nil {
	//				log.WithError(err).Errorf("query trades error")
	//			}
	//
	//		case <-posTicker.C:
	//			// For positive position and positive covered position:
	//			// uncover position = +5 - +3 (covered position) = 2
	//			//
	//			// For positive position and negative covered position:
	//			// uncover position = +5 - (-3) (covered position) = 8
	//			//
	//			// meaning we bought 5 on MAX and sent buy order with 3 on binance
	//			//
	//			// For negative position:
	//			// uncover position = -5 - -3 (covered position) = -2
	//			s.tradeCollector.Process()
	//
	//			position := s.Position.GetBase()
	//
	//			uncoverPosition := position.Sub(s.CoveredPosition)
	//			absPos := uncoverPosition.Abs()
	//			if !s.DisableHedge && absPos.Compare(s.sourceMarket.MinQuantity) > 0 {
	//				log.Infof("%s base position %v coveredPosition: %v uncoverPosition: %v",
	//					s.Symbol,
	//					position,
	//					s.CoveredPosition,
	//					uncoverPosition,
	//				)
	//
	//				s.Hedge(ctx, uncoverPosition.Neg())
	//			}
	//		}
	//	}
	//}()

	//s.Graceful.OnShutdown(func(ctx context.Context, wg *sync.WaitGroup) {
	//	defer wg.Done()
	//
	//	close(s.stopC)
	//
	//	// wait for the quoter to stop
	//	time.Sleep(s.UpdateInterval.Duration())
	//
	//	shutdownCtx, cancelShutdown := context.WithTimeout(context.TODO(), time.Minute)
	//	defer cancelShutdown()
	//
	//	if err := s.activeMakerOrders.GracefulCancel(shutdownCtx, s.makerSession.Exchange); err != nil {
	//		log.WithError(err).Errorf("graceful cancel error")
	//	}
	//
	//	s.Notify("%s: %s position", ID, s.Symbol, s.Position)
	//})

	return nil
}