text: 'use strict';
  
  //  ---------------------------------------------------------------------------
  
  const Exchange = require ('./base/Exchange');
  const { ExchangeError, ArgumentsRequired, OrderNotFound } = require ('./base/errors');
  
  //  ---------------------------------------------------------------------------
  
  module.exports = class bitflyer extends Exchange {
      describe () {
          return this.deepExtend (super.describe (), {
              'id': 'bitflyer',
              'name': 'bitFlyer',
              'countries': [ 'JP' ],
              'version': 'v1',
              'rateLimit': 1000, // their nonce-timestamp is in seconds...
              'has': {
                  'CORS': false,
                  'withdraw': true,
                  'fetchMyTrades': true,
                  'fetchOrders': true,
                  'fetchOrder': 'emulated',
                  'fetchOpenOrders': 'emulated',
                  'fetchClosedOrders': 'emulated',
              },
              'urls': {
                  'logo': 'https://user-images.githubusercontent.com/1294454/28051642-56154182-660e-11e7-9b0d-6042d1e6edd8.jpg',
                  'api': 'https://api.bitflyer.jp',
                  'www': 'https://bitflyer.jp',
                  'doc': 'https://lightning.bitflyer.com/docs?lang=en',
              },
              'api': {
                  'public': {
                      'get': [
                          'getmarkets/usa', // new (wip)
                          'getmarkets/eu',  // new (wip)
                          'getmarkets',     // or 'markets'
                          'getboard',       // ...
                          'getticker',
                          'getexecutions',
                          'gethealth',
                          'getboardstate',
                          'getchats',
                      ],
                  },
                  'private': {
                      'get': [
                          'getpermissions',
                          'getbalance',
                          'getbalancehistory',
                          'getcollateral',
                          'getcollateralhistory',
                          'getcollateralaccounts',
                          'getaddresses',
                          'getcoinins',
                          'getcoinouts',
                          'getbankaccounts',
                          'getdeposits',
                          'getwithdrawals',
                          'getchildorders',
                          'getparentorders',
                          'getparentorder',
                          'getexecutions',
                          'getpositions',
                          'gettradingcommission',
                      ],
                      'post': [
                          'sendcoin',
                          'withdraw',
                          'sendchildorder',
                          'cancelchildorder',
                          'sendparentorder',
                          'cancelparentorder',
                          'cancelallchildorders',
                      ],
                  },
              },
              'fees': {
                  'trading': {
                      'maker': 0.25 / 100,
                      'taker': 0.25 / 100,
                  },
              },
          });
      }
  
      async fetchMarkets (params = {}) {
          const jp_markets = await this.publicGetGetmarkets (params);
          const us_markets = await this.publicGetGetmarketsUsa (params);
          const eu_markets = await this.publicGetGetmarketsEu (params);
          let markets = this.arrayConcat (jp_markets, us_markets);
          markets = this.arrayConcat (markets, eu_markets);
          const result = [];
          for (let i = 0; i < markets.length; i++) {
              const market = markets[i];
              const id = this.safeString (market, 'product_code');
              let spot = true;
              let future = false;
              let type = 'spot';
              if ('alias' in market) {
                  type = 'future';
                  future = true;
                  spot = false;
              }
              const currencies = id.split ('_');
              let baseId = undefined;
              let quoteId = undefined;
              let base = undefined;
              let quote = undefined;
              const numCurrencies = currencies.length;
              if (numCurrencies === 1) {
                  baseId = id.slice (0, 3);
                  quoteId = id.slice (3, 6);
              } else if (numCurrencies === 2) {
                  baseId = currencies[0];
                  quoteId = currencies[1];
              } else {
                  baseId = currencies[1];
                  quoteId = currencies[2];
              }
              base = this.safeCurrencyCode (baseId);
              quote = this.safeCurrencyCode (quoteId);
              const symbol = (numCurrencies === 2) ? (base + '/' + quote) : id;
              result.push ({
                  'id': id,
                  'symbol': symbol,
                  'base': base,
                  'quote': quote,
                  'baseId': baseId,
                  'quoteId': quoteId,
                  'type': type,
                  'spot': spot,
                  'future': future,
                  'info': market,
              });
          }
          return result;
      }
  
      async fetchBalance (params = {}) {
          await this.loadMarkets ();
          const response = await this.privateGetGetbalance (params);
          //
          //     [
          //         {
          //             "currency_code": "JPY",
          //             "amount": 1024078,
          //             "available": 508000
          //         },
          //         {
          //             "currency_code": "BTC",
          //             "amount": 10.24,
          //             "available": 4.12
          //         },
          //         {
          //             "currency_code": "ETH",
          //             "amount": 20.48,
          //             "available": 16.38
          //         }
          //     ]
          //
          const result = { 'info': response };
          for (let i = 0; i < response.length; i++) {
              const balance = response[i];
              const currencyId = this.safeString (balance, 'currency_code');
              const code = this.safeCurrencyCode (currencyId);
              const account = this.account ();
              account['total'] = this.safeFloat (balance, 'amount');
              account['free'] = this.safeFloat (balance, 'available');
              result[code] = account;
          }
          return this.parseBalance (result);
      }
  
      async fetchOrderBook (symbol, limit = undefined, params = {}) {
          await this.loadMarkets ();
          const request = {
              'product_code': this.marketId (symbol),
          };
          const orderbook = await this.publicGetGetboard (this.extend (request, params));
          return this.parseOrderBook (orderbook, undefined, 'bids', 'asks', 'price', 'size');
      }
  
      async fetchTicker (symbol, params = {}) {
          await this.loadMarkets ();
          const request = {
              'product_code': this.marketId (symbol),
          };
          const ticker = await this.publicGetGetticker (this.extend (request, params));
          const timestamp = this.parse8601 (this.safeString (ticker, 'timestamp'));
          const last = this.safeFloat (ticker, 'ltp');
          return {
              'symbol': symbol,
              'timestamp': timestamp,
              'datetime': this.iso8601 (timestamp),
              'high': undefined,
              'low': undefined,
              'bid': this.safeFloat (ticker, 'best_bid'),
              'bidVolume': undefined,
              'ask': this.safeFloat (ticker, 'best_ask'),
              'askVolume': undefined,
              'vwap': undefined,
              'open': undefined,
              'close': last,
              'last': last,
              'previousClose': undefined,
              'change': undefined,
              'percentage': undefined,
              'average': undefined,
              'baseVolume': this.safeFloat (ticker, 'volume_by_product'),
              'quoteVolume': undefined,
              'info': ticker,
          };
      }
  
      parseTrade (trade, market = undefined) {
          let side = this.safeString (trade, 'side');
          if (side !== undefined) {
              if (side.length < 1) {
                  side = undefined;
              } else {
                  side = side.toLowerCase ();
              }
          }
          let order = undefined;
          if (side !== undefined) {
              side = side.toLowerCase ();
              const id = side + '_child_order_acceptance_id';
              if (id in trade) {
                  order = trade[id];
              }
          }
          if (order === undefined) {
              order = this.safeString (trade, 'child_order_acceptance_id');
          }
          const timestamp = this.parse8601 (this.safeString (trade, 'exec_date'));
          const price = this.safeFloat (trade, 'price');
          const amount = this.safeFloat (trade, 'size');
          let cost = undefined;
          if (amount !== undefined) {
              if (price !== undefined) {
                  cost = price * amount;
              }
          }
          const id = this.safeString (trade, 'id');
          let symbol = undefined;
          if (market !== undefined) {
              symbol = market['symbol'];
          }
          return {
              'id': id,
              'info': trade,
              'timestamp': timestamp,
              'datetime': this.iso8601 (timestamp),
              'symbol': symbol,
              'order': order,
              'type': undefined,
              'side': side,
              'takerOrMaker': undefined,
              'price': price,
              'amount': amount,
              'cost': cost,
              'fee': undefined,
          };
      }
  
      async fetchTrades (symbol, since = undefined, limit = undefined, params = {}) {
          await this.loadMarkets ();
          const market = this.market (symbol);
          const request = {
              'product_code': market['id'],
          };
          const response = await this.publicGetGetexecutions (this.extend (request, params));
          return this.parseTrades (response, market, since, limit);
      }
  
      async createOrder (symbol, type, side, amount, price = undefined, params = {}) {
          await this.loadMarkets ();
          const request = {
              'product_code': this.marketId (symbol),
              'child_order_type': type.toUpperCase (),
              'side': side.toUpperCase (),
              'price': price,
              'size': amount,
          };
          const result = await this.privatePostSendchildorder (this.extend (request, params));
          // { "status": - 200, "error_message": "Insufficient funds", "data": null }
          const id = this.safeString (result, 'child_order_acceptance_id');
          return {
              'info': result,
              'id': id,
          };
      }
  
      async cancelOrder (id, symbol = undefined, params = {}) {
          if (symbol === undefined) {
              throw new ArgumentsRequired (this.id + ' cancelOrder() requires a `symbol` argument');
          }
          await this.loadMarkets ();
          const request = {
              'product_code': this.marketId (symbol),
              'child_order_acceptance_id': id,
          };
          return await this.privatePostCancelchildorder (this.extend (request, params));
      }
  
      parseOrderStatus (status) {
          const statuses = {
              'ACTIVE': 'open',
              'COMPLETED': 'closed',
              'CANCELED': 'canceled',
              'EXPIRED': 'canceled',
              'REJECTED': 'canceled',
          };
          return this.safeString (statuses, status, status);
      }
  
      parseOrder (order, market = undefined) {
          const timestamp = this.parse8601 (this.safeString (order, 'child_order_date'));
          const amount = this.safeFloat (order, 'size');
          const remaining = this.safeFloat (order, 'outstanding_size');
          const filled = this.safeFloat (order, 'executed_size');
          const price = this.safeFloat (order, 'price');
          const cost = price * filled;
          const status = this.parseOrderStatus (this.safeString (order, 'child_order_state'));
          let type = this.safeString (order, 'child_order_type');
          if (type !== undefined) {
              type = type.toLowerCase ();
          }
          let side = this.safeString (order, 'side');
          if (side !== undefined) {
              side = side.toLowerCase ();
          }
          let symbol = undefined;
          if (market === undefined) {
              const marketId = this.safeString (order, 'product_code');
              if (marketId in this.markets_by_id) {
                  market = this.markets_by_id[marketId];
              }
          }
          if (market !== undefined) {
              symbol = market['symbol'];
          }
          let fee = undefined;
          const feeCost = this.safeFloat (order, 'total_commission');
          if (feeCost !== undefined) {
              fee = {
                  'cost': feeCost,
                  'currency': undefined,
                  'rate': undefined,
              };
          }
          const id = this.safeString (order, 'child_order_acceptance_id');
          return {
              'id': id,
              'info': order,
              'timestamp': timestamp,
              'datetime': this.iso8601 (timestamp),
              'lastTradeTimestamp': undefined,
              'status': status,
              'symbol': symbol,
              'type': type,
              'side': side,
              'price': price,
              'cost': cost,
              'amount': amount,
              'filled': filled,
              'remaining': remaining,
              'fee': fee,
          };
      }
  
      async fetchOrders (symbol = undefined, since = undefined, limit = 100, params = {}) {
          if (symbol === undefined) {
              throw new ArgumentsRequired (this.id + ' fetchOrders() requires a `symbol` argument');
          }
          await this.loadMarkets ();
          const market = this.market (symbol);
          const request = {
              'product_code': market['id'],
              'count': limit,
          };
          const response = await this.privateGetGetchildorders (this.extend (request, params));
          let orders = this.parseOrders (response, market, since, limit);
          if (symbol !== undefined) {
              orders = this.filterBy (orders, 'symbol', symbol);
          }
          return orders;
      }
  
      async fetchOpenOrders (symbol = undefined, since = undefined, limit = 100, params = {}) {
          const request = {
              'child_order_state': 'ACTIVE',
          };
          return await this.fetchOrders (symbol, since, limit, this.extend (request, params));
      }
  
      async fetchClosedOrders (symbol = undefined, since = undefined, limit = 100, params = {}) {
          const request = {
              'child_order_state': 'COMPLETED',
          };
          return await this.fetchOrders (symbol, since, limit, this.extend (request, params));
      }
  
      async fetchOrder (id, symbol = undefined, params = {}) {
          if (symbol === undefined) {
              throw new ArgumentsRequired (this.id + ' fetchOrder() requires a `symbol` argument');
          }
          const orders = await this.fetchOrders (symbol);
          const ordersById = this.indexBy (orders, 'id');
          if (id in ordersById) {
              return ordersById[id];
          }
          throw new OrderNotFound (this.id + ' No order found with id ' + id);
      }
  
      async fetchMyTrades (symbol = undefined, since = undefined, limit = undefined, params = {}) {
          if (symbol === undefined) {
              throw new ArgumentsRequired (this.id + ' fetchMyTrades requires a `symbol` argument');
          }
          await this.loadMarkets ();
          const market = this.market (symbol);
          const request = {
              'product_code': market['id'],
          };
          if (limit !== undefined) {
              request['count'] = limit;
          }
          const response = await this.privateGetGetexecutions (this.extend (request, params));
          return this.parseTrades (response, market, since, limit);
      }
  
      async withdraw (code, amount, address, tag = undefined, params = {}) {
          this.checkAddress (address);
          await this.loadMarkets ();
          if (code !== 'JPY' && code !== 'USD' && code !== 'EUR') {
              throw new ExchangeError (this.id + ' allows withdrawing JPY, USD, EUR only, ' + code + ' is not supported');
          }
          const currency = this.currency (code);
          const request = {
              'currency_code': currency['id'],
              'amount': amount,
              // 'bank_account_id': 1234,
          };
          const response = await this.privatePostWithdraw (this.extend (request, params));
          const id = this.safeString (response, 'message_id');
          return {
              'info': response,
              'id': id,
          };
      }
  
      sign (path, api = 'public', method = 'GET', params = {}, headers = undefined, body = undefined) {
          let request = '/' + this.version + '/';
          if (api === 'private') {
              request += 'me/';
          }
          request += path;
          if (method === 'GET') {
              if (Object.keys (params).length) {
                  request += '?' + this.urlencode (params);
              }
          }
          const url = this.urls['api'] + request;
          if (api === 'private') {
              this.checkRequiredCredentials ();
              const nonce = this.nonce ().toString ();
              let auth = [ nonce, method, request ].join ('');
              if (Object.keys (params).length) {
                  if (method !== 'GET') {
                      body = this.json (params);
                      auth += body;
                  }
              }
              headers = {
                  'ACCESS-KEY': this.apiKey,
                  'ACCESS-TIMESTAMP': nonce,
                  'ACCESS-SIGN': this.hmac (this.encode (auth), this.encode (this.secret)),
                  'Content-Type': 'application/json',
              };
          }
          return { 'url': url, 'method': method, 'body': body, 'headers': headers };
      }
  };
  