package bitflyer

import (
	"strings"
	"sync"
	"time"

	"github.com/thrasher-corp/gocryptotrader/common"
	"github.com/thrasher-corp/gocryptotrader/config"
	"github.com/thrasher-corp/gocryptotrader/currency"
	exchange "github.com/thrasher-corp/gocryptotrader/exchanges"
	"github.com/thrasher-corp/gocryptotrader/exchanges/asset"
	"github.com/thrasher-corp/gocryptotrader/exchanges/order"
	"github.com/thrasher-corp/gocryptotrader/exchanges/orderbook"
	"github.com/thrasher-corp/gocryptotrader/exchanges/protocol"
	"github.com/thrasher-corp/gocryptotrader/exchanges/request"
	"github.com/thrasher-corp/gocryptotrader/exchanges/ticker"
	"github.com/thrasher-corp/gocryptotrader/exchanges/websocket/wshandler"
	"github.com/thrasher-corp/gocryptotrader/exchanges/withdraw"
	log "github.com/thrasher-corp/gocryptotrader/logger"
)

// GetDefaultConfig returns a default exchange config
func (b *Bitflyer) GetDefaultConfig() (*config.ExchangeConfig, error) {
	b.SetDefaults()
	exchCfg := new(config.ExchangeConfig)
	exchCfg.Name = b.Name
	exchCfg.HTTPTimeout = exchange.DefaultHTTPTimeout
	exchCfg.BaseCurrencies = b.BaseCurrencies

	err := b.SetupDefaults(exchCfg)
	if err != nil {
		return nil, err
	}

	if b.Features.Supports.RESTCapabilities.AutoPairUpdates {
		err = b.UpdateTradablePairs(true)
		if err != nil {
			return nil, err
		}
	}

	return exchCfg, nil
}

// SetDefaults sets the basic defaults for Bitflyer
func (b *Bitflyer) SetDefaults() {
	b.Name = "Bitflyer"
	b.Enabled = true
	b.Verbose = true
	b.API.CredentialsValidator.RequiresKey = true
	b.API.CredentialsValidator.RequiresSecret = true

	b.CurrencyPairs = currency.PairsManager{
		AssetTypes: asset.Items{
			asset.Spot,
			asset.Futures,
		},
		UseGlobalFormat: true,
		RequestFormat: &currency.PairFormat{
			Delimiter: "_",
			Uppercase: true,
		},
		ConfigFormat: &currency.PairFormat{
			Delimiter: "_",
			Uppercase: true,
		},
	}

	b.Features = exchange.Features{
		Supports: exchange.FeaturesSupported{
			REST:      true,
			Websocket: false,
			RESTCapabilities: protocol.Features{
				TickerFetching:    true,
				OrderbookFetching: true,
				AutoPairUpdates:   true,
				TradeFee:          true,
				FiatDepositFee:    true,
				FiatWithdrawalFee: true,
			},
			WithdrawPermissions: exchange.WithdrawCryptoViaWebsiteOnly |
				exchange.AutoWithdrawFiat,
		},
		Enabled: exchange.FeaturesEnabled{
			AutoPairUpdates: true,
		},
	}

	b.Requester = request.New(b.Name,
		request.NewRateLimit(time.Minute, bitflyerAuthRate),
		request.NewRateLimit(time.Minute, bitflyerUnauthRate),
		common.NewHTTPClientWithTimeout(exchange.DefaultHTTPTimeout))

	b.API.Endpoints.URLDefault = japanURL
	b.API.Endpoints.URL = b.API.Endpoints.URLDefault
	b.API.Endpoints.URLSecondaryDefault = chainAnalysis
	b.API.Endpoints.URLSecondary = b.API.Endpoints.URLSecondaryDefault
}

// Setup takes in the supplied exchange configuration details and sets params
func (b *Bitflyer) Setup(exch *config.ExchangeConfig) error {
	if !exch.Enabled {
		b.SetEnabled(false)
		return nil
	}

	return b.SetupDefaults(exch)
}

// Start starts the Bitflyer go routine
func (b *Bitflyer) Start(wg *sync.WaitGroup) {
	wg.Add(1)
	go func() {
		b.Run()
		wg.Done()
	}()
}

// Run implements the Bitflyer wrapper
func (b *Bitflyer) Run() {
	if b.Verbose {
		b.PrintEnabledPairs()
	}

	if !b.GetEnabledFeatures().AutoPairUpdates {
		return
	}

	err := b.UpdateTradablePairs(false)
	if err != nil {
		log.Errorf(log.ExchangeSys, "%s failed to update tradable pairs. Err: %s", b.Name, err)
	}
}

// FetchTradablePairs returns a list of the exchanges tradable pairs
func (b *Bitflyer) FetchTradablePairs(assetType asset.Item) ([]string, error) {
	pairs, err := b.GetMarkets()
	if err != nil {
		return nil, err
	}

	var products []string
	for i := range pairs {
		if pairs[i].Alias != "" && assetType == asset.Futures {
			products = append(products, pairs[i].Alias)
		} else if pairs[i].Alias == "" &&
			assetType == asset.Spot &&
			strings.Contains(pairs[i].ProductCode,
				b.GetPairFormat(assetType, false).Delimiter) {
			products = append(products, pairs[i].ProductCode)
		}
	}
	return products, nil
}

// UpdateTradablePairs updates the exchanges available pairs and stores
// them in the exchanges config
func (b *Bitflyer) UpdateTradablePairs(forceUpdate bool) error {
	for x := range b.CurrencyPairs.AssetTypes {
		a := b.CurrencyPairs.AssetTypes[x]
		pairs, err := b.FetchTradablePairs(a)
		if err != nil {
			return err
		}

		err = b.UpdatePairs(currency.NewPairsFromStrings(pairs),
			a,
			false,
			forceUpdate)
		if err != nil {
			return err
		}
	}
	return nil
}

// UpdateTicker updates and returns the ticker for a currency pair
func (b *Bitflyer) UpdateTicker(p currency.Pair, assetType asset.Item) (*ticker.Price, error) {
	tickerPrice := new(ticker.Price)

	p = b.CheckFXString(p)

	tickerNew, err := b.GetTicker(p.String())
	if err != nil {
		return tickerPrice, err
	}

	tickerPrice.Pair = p
	tickerPrice.Ask = tickerNew.BestAsk
	tickerPrice.Bid = tickerNew.BestBid
	tickerPrice.Last = tickerNew.Last
	tickerPrice.Volume = tickerNew.Volume
	err = ticker.ProcessTicker(b.Name, tickerPrice, assetType)
	if err != nil {
		return tickerPrice, err
	}

	return ticker.GetTicker(b.Name, p, assetType)
}

// FetchTicker returns the ticker for a currency pair
func (b *Bitflyer) FetchTicker(p currency.Pair, assetType asset.Item) (*ticker.Price, error) {
	tick, err := ticker.GetTicker(b.Name, p, assetType)
	if err != nil {
		return b.UpdateTicker(p, assetType)
	}
	return tick, nil
}

// CheckFXString upgrades currency pair if needed
func (b *Bitflyer) CheckFXString(p currency.Pair) currency.Pair {
	if strings.Contains(p.Base.String(), "FX") {
		p.Base = currency.FX_BTC
		return p
	}
	return p
}

// FetchOrderbook returns the orderbook for a currency pair
func (b *Bitflyer) FetchOrderbook(p currency.Pair, assetType asset.Item) (*orderbook.Base, error) {
	ob, err := orderbook.Get(b.Name, p, assetType)
	if err != nil {
		return b.UpdateOrderbook(p, assetType)
	}
	return ob, nil
}

// UpdateOrderbook updates and returns the orderbook for a currency pair
func (b *Bitflyer) UpdateOrderbook(p currency.Pair, assetType asset.Item) (*orderbook.Base, error) {
	orderBook := new(orderbook.Base)

	p = b.CheckFXString(p)

	orderbookNew, err := b.GetOrderBook(p.String())
	if err != nil {
		return orderBook, err
	}

	for x := range orderbookNew.Asks {
		orderBook.Asks = append(orderBook.Asks, orderbook.Item{Price: orderbookNew.Asks[x].Price, Amount: orderbookNew.Asks[x].Size})
	}

	for x := range orderbookNew.Bids {
		orderBook.Bids = append(orderBook.Bids, orderbook.Item{Price: orderbookNew.Bids[x].Price, Amount: orderbookNew.Bids[x].Size})
	}

	orderBook.Pair = p
	orderBook.ExchangeName = b.Name
	orderBook.AssetType = assetType

	err = orderBook.Process()
	if err != nil {
		return orderBook, err
	}

	return orderbook.Get(b.Name, p, assetType)
}

// GetAccountInfo retrieves balances for all enabled currencies on the
// Bitflyer exchange
func (b *Bitflyer) GetAccountInfo() (exchange.AccountInfo, error) {
	return exchange.AccountInfo{}, common.ErrNotYetImplemented
}

// GetFundingHistory returns funding history, deposits and
// withdrawals
func (b *Bitflyer) GetFundingHistory() ([]exchange.FundHistory, error) {
	return nil, common.ErrFunctionNotSupported
}

// GetExchangeHistory returns historic trade data since exchange opening.
func (b *Bitflyer) GetExchangeHistory(p currency.Pair, assetType asset.Item) ([]exchange.TradeHistory, error) {
	return nil, common.ErrNotYetImplemented
}

// SubmitOrder submits a new order
func (b *Bitflyer) SubmitOrder(s *order.Submit) (order.SubmitResponse, error) {
	return order.SubmitResponse{}, common.ErrNotYetImplemented
}

// ModifyOrder will allow of changing orderbook placement and limit to
// market conversion
func (b *Bitflyer) ModifyOrder(action *order.Modify) (string, error) {
	return "", common.ErrFunctionNotSupported
}

// CancelOrder cancels an order by its corresponding ID number
func (b *Bitflyer) CancelOrder(order *order.Cancel) error {
	return common.ErrNotYetImplemented
}

// CancelAllOrders cancels all orders associated with a currency pair
func (b *Bitflyer) CancelAllOrders(_ *order.Cancel) (order.CancelAllResponse, error) {
	// TODO, implement BitFlyer API
	b.CancelAllExistingOrders()
	return order.CancelAllResponse{}, common.ErrNotYetImplemented
}

// GetOrderInfo returns information on a current open order
func (b *Bitflyer) GetOrderInfo(orderID string) (order.Detail, error) {
	var orderDetail order.Detail
	return orderDetail, common.ErrNotYetImplemented
}

// GetDepositAddress returns a deposit address for a specified currency
func (b *Bitflyer) GetDepositAddress(cryptocurrency currency.Code, accountID string) (string, error) {
	return "", common.ErrNotYetImplemented
}

// WithdrawCryptocurrencyFunds returns a withdrawal ID when a withdrawal is
// submitted
func (b *Bitflyer) WithdrawCryptocurrencyFunds(withdrawRequest *withdraw.CryptoRequest) (string, error) {
	return "", common.ErrNotYetImplemented
}

// WithdrawFiatFunds returns a withdrawal ID when a
// withdrawal is submitted
func (b *Bitflyer) WithdrawFiatFunds(withdrawRequest *withdraw.FiatRequest) (string, error) {
	return "", common.ErrNotYetImplemented
}

// WithdrawFiatFundsToInternationalBank returns a withdrawal ID when a
// withdrawal is submitted
func (b *Bitflyer) WithdrawFiatFundsToInternationalBank(withdrawRequest *withdraw.FiatRequest) (string, error) {
	return "", common.ErrNotYetImplemented
}

// GetWebsocket returns a pointer to the exchange websocket
func (b *Bitflyer) GetWebsocket() (*wshandler.Websocket, error) {
	return nil, common.ErrNotYetImplemented
}

// GetActiveOrders retrieves any orders that are active/open
func (b *Bitflyer) GetActiveOrders(getOrdersRequest *order.GetOrdersRequest) ([]order.Detail, error) {
	return nil, common.ErrNotYetImplemented
}

// GetOrderHistory retrieves account order information
// Can Limit response to specific order status
func (b *Bitflyer) GetOrderHistory(getOrdersRequest *order.GetOrdersRequest) ([]order.Detail, error) {
	return nil, common.ErrNotYetImplemented
}

// GetFeeByType returns an estimate of fee based on the type of transaction
func (b *Bitflyer) GetFeeByType(feeBuilder *exchange.FeeBuilder) (float64, error) {
	if !b.AllowAuthenticatedRequest() && // Todo check connection status
		feeBuilder.FeeType == exchange.CryptocurrencyTradeFee {
		feeBuilder.FeeType = exchange.OfflineTradeFee
	}
	return b.GetFee(feeBuilder)
}

// SubscribeToWebsocketChannels appends to ChannelsToSubscribe
// which lets websocket.manageSubscriptions handle subscribing
func (b *Bitflyer) SubscribeToWebsocketChannels(channels []wshandler.WebsocketChannelSubscription) error {
	return common.ErrFunctionNotSupported
}

// UnsubscribeToWebsocketChannels removes from ChannelsToSubscribe
// which lets websocket.manageSubscriptions handle unsubscribing
func (b *Bitflyer) UnsubscribeToWebsocketChannels(channels []wshandler.WebsocketChannelSubscription) error {
	return common.ErrFunctionNotSupported
}

// GetSubscriptions returns a copied list of subscriptions
func (b *Bitflyer) GetSubscriptions() ([]wshandler.WebsocketChannelSubscription, error) {
	return nil, common.ErrFunctionNotSupported
}

// AuthenticateWebsocket sends an authentication message to the websocket
func (b *Bitflyer) AuthenticateWebsocket() error {
	return common.ErrFunctionNotSupported
}