package service

import (
	"context"
	"time"

	"github.com/sirupsen/logrus"

	"github.com/c9s/bbgo/pkg/types"
)

type SyncService struct {
	TradeService *TradeService
	OrderService *OrderService
}

func (s *SyncService) SyncOrders(ctx context.Context, exchange types.Exchange, symbol string, startTime time.Time) error {
	isMargin := false
	isIsolated := false
	if marginExchange, ok := exchange.(types.MarginExchange); ok {
		marginSettings := marginExchange.GetMarginSettings()
		isMargin = marginSettings.IsMargin
		isIsolated = marginSettings.IsIsolatedMargin
		if marginSettings.IsIsolatedMargin {
			symbol = marginSettings.IsolatedMarginSymbol
		}
	}

	lastOrder, err := s.OrderService.QueryLast(exchange.Name(), symbol, isMargin, isIsolated)
	if err != nil {
		return err
	}

	var lastID uint64 = 0
	if lastOrder != nil {
		lastID = lastOrder.OrderID
		startTime = lastOrder.CreationTime.Time()

		logrus.Infof("found last order, start from lastID = %d since %s", lastID, startTime)
	}

	batch := &types.ExchangeBatchProcessor{Exchange: exchange}
	ordersC, errC := batch.BatchQueryClosedOrders(ctx, symbol, startTime, time.Now(), lastID)
	for order := range ordersC {
		select {

		case <-ctx.Done():
			return ctx.Err()

		case err := <-errC:
			if err != nil {
				return err
			}

		default:

		}

		if err := s.OrderService.Insert(order); err != nil {
			return err
		}
	}

	return <-errC
}

func (s *SyncService) SyncTrades(ctx context.Context, exchange types.Exchange, symbol string, startTime time.Time) error {
	isMargin := false
	isIsolated := false
	if marginExchange, ok := exchange.(types.MarginExchange); ok {
		marginSettings := marginExchange.GetMarginSettings()
		isMargin = marginSettings.IsMargin
		isIsolated = marginSettings.IsIsolatedMargin
		if marginSettings.IsIsolatedMargin {
			symbol = marginSettings.IsolatedMarginSymbol
		}
	}

	lastTrade, err := s.TradeService.QueryLast(exchange.Name(), symbol, isMargin, isIsolated)
	if err != nil {
		return err
	}

	var lastID int64 = 0
	if lastTrade != nil {
		lastID = lastTrade.ID
		startTime = time.Time(lastTrade.Time)

		logrus.Infof("found last trade, start from lastID = %d since %s", lastID, startTime)
	}

	batch := &types.ExchangeBatchProcessor{Exchange: exchange}
	tradeC, errC := batch.BatchQueryTrades(ctx, symbol, &types.TradeQueryOptions{
		StartTime:   &startTime,
		LastTradeID: lastID,
	})

	for trade := range tradeC {
		select {
		case <-ctx.Done():
			return ctx.Err()

		case err := <-errC:
			if err != nil {
				return err
			}

		default:
		}

		if err := s.TradeService.Insert(trade); err != nil {
			return err
		}

	}

	return <-errC
}