text: 'use strict';
  
  //  ---------------------------------------------------------------------------
  
  const Exchange = require ('./base/Exchange');
  const { ExchangeError, ArgumentsRequired, AuthenticationError, OrderNotFound, InsufficientFunds, PermissionDenied, BadRequest, BadSymbol, RateLimitExceeded, InvalidOrder } = require ('./base/errors');
  
  //  ---------------------------------------------------------------------------
  
  module.exports = class bigone extends Exchange {
      describe () {
          return this.deepExtend (super.describe (), {
              'id': 'bigone',
              'name': 'BigONE',
              'countries': [ 'CN' ],
              'version': 'v3',
              'rateLimit': 1200, // 500 request per 10 minutes
              'has': {
                  'cancelAllOrders': true,
                  'cancelOrder': true,
                  'createOrder': true,
                  'fetchBalance': true,
                  'fetchClosedOrders': true,
                  'fetchDepositAddress': true,
                  'fetchDeposits': true,
                  'fetchMarkets': true,
                  'fetchMyTrades': true,
                  'fetchOHLCV': true,
                  'fetchOpenOrders': true,
                  'fetchOrder': true,
                  'fetchOrderBook': true,
                  'fetchOrders': true,
                  'fetchTicker': true,
                  'fetchTickers': true,
                  'fetchTime': true,
                  'fetchTrades': true,
                  'fetchWithdrawals': true,
                  'withdraw': true,
              },
              'timeframes': {
                  '1m': 'min1',
                  '5m': 'min5',
                  '15m': 'min15',
                  '30m': 'min30',
                  '1h': 'hour1',
                  '3h': 'hour3',
                  '4h': 'hour4',
                  '6h': 'hour6',
                  '12h': 'hour12',
                  '1d': 'day1',
                  '1w': 'week1',
                  '1M': 'month1',
              },
              'hostname': 'big.one', // or 'bigone.com'
              'urls': {
                  'logo': 'https://user-images.githubusercontent.com/1294454/69354403-1d532180-0c91-11ea-88ed-44c06cefdf87.jpg',
                  'api': {
                      'public': 'https://{hostname}/api/v3',
                      'private': 'https://{hostname}/api/v3/viewer',
                  },
                  'www': 'https://big.one',
                  'doc': 'https://open.big.one/docs/api.html',
                  'fees': 'https://bigone.zendesk.com/hc/en-us/articles/115001933374-BigONE-Fee-Policy',
                  'referral': 'https://b1.run/users/new?code=D3LLBVFT',
              },
              'api': {
                  'public': {
                      'get': [
                          'ping',
                          'asset_pairs',
                          'asset_pairs/{asset_pair_name}/depth',
                          'asset_pairs/{asset_pair_name}/trades',
                          'asset_pairs/{asset_pair_name}/ticker',
                          'asset_pairs/{asset_pair_name}/candles',
                          'asset_pairs/tickers',
                      ],
                  },
                  'private': {
                      'get': [
                          'accounts',
                          'fund/accounts',
                          'assets/{asset_symbol}/address',
                          'orders',
                          'orders/{id}',
                          'orders/multi',
                          'trades',
                          'withdrawals',
                          'deposits',
                      ],
                      'post': [
                          'orders',
                          'orders/{id}/cancel',
                          'orders/cancel',
                          'withdrawals',
                          'transfer',
                      ],
                  },
              },
              'fees': {
                  'trading': {
                      'maker': this.parseNumber ('0.001'),
                      'taker': this.parseNumber ('0.001'),
                  },
                  'funding': {
                      'withdraw': {},
                  },
              },
              'exceptions': {
                  'exact': {
                      '10001': BadRequest, // syntax error
                      '10005': ExchangeError, // internal error
                      "Amount's scale must greater than AssetPair's base scale": InvalidOrder,
                      "Price mulit with amount should larger than AssetPair's min_quote_value": InvalidOrder,
                      '10007': BadRequest, // parameter error, {"code":10007,"message":"Amount's scale must greater than AssetPair's base scale"}
                      '10011': ExchangeError, // system error
                      '10013': OrderNotFound, // {"code":10013,"message":"Resource not found"}
                      '10014': InsufficientFunds, // {"code":10014,"message":"Insufficient funds"}
                      '10403': PermissionDenied, // permission denied
                      '10429': RateLimitExceeded, // too many requests
                      '40004': AuthenticationError, // {"code":40004,"message":"invalid jwt"}
                      '40103': AuthenticationError, // invalid otp code
                      '40104': AuthenticationError, // invalid asset pin code
                      '40301': PermissionDenied, // {"code":40301,"message":"Permission denied withdrawal create"}
                      '40302': ExchangeError, // already requested
                      '40601': ExchangeError, // resource is locked
                      '40602': ExchangeError, // resource is depleted
                      '40603': InsufficientFunds, // insufficient resource
                      '40605': InvalidOrder, // {"code":40605,"message":"Price less than the minimum order price"}
                      '40120': InvalidOrder, // Order is in trading
                      '40121': InvalidOrder, // Order is already cancelled or filled
                      '60100': BadSymbol, // {"code":60100,"message":"Asset pair is suspended"}
                  },
                  'broad': {
                  },
              },
              'commonCurrencies': {
                  'CRE': 'Cybereits',
                  'FXT': 'FXTTOKEN',
                  'MBN': 'Mobilian Coin',
                  'ONE': 'BigONE Token',
              },
          });
      }
  
      async fetchMarkets (params = {}) {
          const response = await this.publicGetAssetPairs (params);
          //
          //     {
          //         "code":0,
          //         "data":[
          //             {
          //                 "id":"01e48809-b42f-4a38-96b1-c4c547365db1",
          //                 "name":"PCX-BTC",
          //                 "quote_scale":7,
          //                 "quote_asset":{
          //                     "id":"0df9c3c3-255a-46d7-ab82-dedae169fba9",
          //                     "symbol":"BTC",
          //                     "name":"Bitcoin",
          //                 },
          //                 "base_asset":{
          //                     "id":"405484f7-4b03-4378-a9c1-2bd718ecab51",
          //                     "symbol":"PCX",
          //                     "name":"ChainX",
          //                 },
          //                 "base_scale":3,
          //                 "min_quote_value":"0.0001",
          //             },
          //         ]
          //     }
          //
          const markets = this.safeValue (response, 'data', []);
          const result = [];
          for (let i = 0; i < markets.length; i++) {
              const market = markets[i];
              const id = this.safeString (market, 'name');
              const uuid = this.safeString (market, 'id');
              const baseAsset = this.safeValue (market, 'base_asset', {});
              const quoteAsset = this.safeValue (market, 'quote_asset', {});
              const baseId = this.safeString (baseAsset, 'symbol');
              const quoteId = this.safeString (quoteAsset, 'symbol');
              const base = this.safeCurrencyCode (baseId);
              const quote = this.safeCurrencyCode (quoteId);
              const symbol = base + '/' + quote;
              const amountPrecisionString = this.safeString (market, 'base_scale');
              const pricePrecisionString = this.safeString (market, 'quote_scale');
              const amountLimit = this.parsePrecision (amountPrecisionString);
              const priceLimit = this.parsePrecision (pricePrecisionString);
              const precision = {
                  'amount': parseInt (amountPrecisionString),
                  'price': parseInt (pricePrecisionString),
              };
              const minCost = this.safeNumber (market, 'min_quote_value');
              const entry = {
                  'id': id,
                  'uuid': uuid,
                  'symbol': symbol,
                  'base': base,
                  'quote': quote,
                  'baseId': baseId,
                  'quoteId': quoteId,
                  'type': 'spot',
                  'spot': true,
                  'active': true,
                  'precision': precision,
                  'limits': {
                      'amount': {
                          'min': this.parseNumber (amountLimit),
                          'max': undefined,
                      },
                      'price': {
                          'min': this.parseNumber (priceLimit),
                          'max': undefined,
                      },
                      'cost': {
                          'min': minCost,
                          'max': undefined,
                      },
                  },
                  'info': market,
              };
              result.push (entry);
          }
          return result;
      }
  
      async loadMarkets (reload = false, params = {}) {
          const markets = await super.loadMarkets (reload, params);
          let marketsByUuid = this.safeValue (this.options, 'marketsByUuid');
          if ((marketsByUuid === undefined) || reload) {
              marketsByUuid = {};
              for (let i = 0; i < this.symbols.length; i++) {
                  const symbol = this.symbols[i];
                  const market = this.markets[symbol];
                  const uuid = this.safeString (market, 'uuid');
                  marketsByUuid[uuid] = market;
              }
              this.options['marketsByUuid'] = marketsByUuid;
          }
          return markets;
      }
  
      parseTicker (ticker, market = undefined) {
          //
          //     {
          //         "asset_pair_name":"ETH-BTC",
          //         "bid":{"price":"0.021593","order_count":1,"quantity":"0.20936"},
          //         "ask":{"price":"0.021613","order_count":1,"quantity":"2.87064"},
          //         "open":"0.021795",
          //         "high":"0.021795",
          //         "low":"0.021471",
          //         "close":"0.021613",
          //         "volume":"117078.90431",
          //         "daily_change":"-0.000182"
          //     }
          //
          const marketId = this.safeString (ticker, 'asset_pair_name');
          const symbol = this.safeSymbol (marketId, market, '-');
          const timestamp = undefined;
          const close = this.safeNumber (ticker, 'close');
          const bid = this.safeValue (ticker, 'bid', {});
          const ask = this.safeValue (ticker, 'ask', {});
          return this.safeTicker ({
              'symbol': symbol,
              'timestamp': timestamp,
              'datetime': this.iso8601 (timestamp),
              'high': this.safeNumber (ticker, 'high'),
              'low': this.safeNumber (ticker, 'low'),
              'bid': this.safeNumber (bid, 'price'),
              'bidVolume': this.safeNumber (bid, 'quantity'),
              'ask': this.safeNumber (ask, 'price'),
              'askVolume': this.safeNumber (ask, 'quantity'),
              'vwap': undefined,
              'open': this.safeNumber (ticker, 'open'),
              'close': close,
              'last': close,
              'previousClose': undefined,
              'change': this.safeNumber (ticker, 'daily_change'),
              'percentage': undefined,
              'average': undefined,
              'baseVolume': this.safeNumber (ticker, 'volume'),
              'quoteVolume': undefined,
              'info': ticker,
          }, market);
      }
  
      async fetchTicker (symbol, params = {}) {
          await this.loadMarkets ();
          const market = this.market (symbol);
          const request = {
              'asset_pair_name': market['id'],
          };
          const response = await this.publicGetAssetPairsAssetPairNameTicker (this.extend (request, params));
          //
          //     {
          //         "code":0,
          //         "data":{
          //             "asset_pair_name":"ETH-BTC",
          //             "bid":{"price":"0.021593","order_count":1,"quantity":"0.20936"},
          //             "ask":{"price":"0.021613","order_count":1,"quantity":"2.87064"},
          //             "open":"0.021795",
          //             "high":"0.021795",
          //             "low":"0.021471",
          //             "close":"0.021613",
          //             "volume":"117078.90431",
          //             "daily_change":"-0.000182"
          //         }
          //     }
          //
          const ticker = this.safeValue (response, 'data', {});
          return this.parseTicker (ticker, market);
      }
  
      async fetchTickers (symbols = undefined, params = {}) {
          await this.loadMarkets ();
          const request = {};
          if (symbols !== undefined) {
              const ids = this.marketIds (symbols);
              request['pair_names'] = ids.join (',');
          }
          const response = await this.publicGetAssetPairsTickers (this.extend (request, params));
          //
          //     {
          //         "code":0,
          //         "data":[
          //             {
          //                 "asset_pair_name":"PCX-BTC",
          //                 "bid":{"price":"0.000234","order_count":1,"quantity":"0.518"},
          //                 "ask":{"price":"0.0002348","order_count":1,"quantity":"2.348"},
          //                 "open":"0.0002343",
          //                 "high":"0.0002348",
          //                 "low":"0.0002162",
          //                 "close":"0.0002348",
          //                 "volume":"12887.016",
          //                 "daily_change":"0.0000005"
          //             },
          //             {
          //                 "asset_pair_name":"GXC-USDT",
          //                 "bid":{"price":"0.5054","order_count":1,"quantity":"40.53"},
          //                 "ask":{"price":"0.5055","order_count":1,"quantity":"38.53"},
          //                 "open":"0.5262",
          //                 "high":"0.5323",
          //                 "low":"0.5055",
          //                 "close":"0.5055",
          //                 "volume":"603963.05",
          //                 "daily_change":"-0.0207"
          //             }
          //         ]
          //     }
          //
          const tickers = this.safeValue (response, 'data', []);
          const result = {};
          for (let i = 0; i < tickers.length; i++) {
              const ticker = this.parseTicker (tickers[i]);
              const symbol = ticker['symbol'];
              result[symbol] = ticker;
          }
          return this.filterByArray (result, 'symbol', symbols);
      }
  
      async fetchTime (params = {}) {
          const response = await this.publicGetPing (params);
          //
          //     {
          //         "data": {
          //             "timestamp": 1527665262168391000
          //         }
          //     }
          //
          const data = this.safeValue (response, 'data', {});
          const timestamp = this.safeInteger (data, 'timestamp');
          return parseInt (timestamp / 1000000);
      }
  
      async fetchOrderBook (symbol, limit = undefined, params = {}) {
          await this.loadMarkets ();
          const market = this.market (symbol);
          const request = {
              'asset_pair_name': market['id'],
          };
          if (limit !== undefined) {
              request['limit'] = limit; // default 50, max 200
          }
          const response = await this.publicGetAssetPairsAssetPairNameDepth (this.extend (request, params));
          //
          //     {
          //         "code":0,
          //         "data": {
          //             "asset_pair_name": "EOS-BTC",
          //             "bids": [
          //                 { "price": "42", "order_count": 4, "quantity": "23.33363711" }
          //             ],
          //             "asks": [
          //                 { "price": "45", "order_count": 2, "quantity": "4193.3283464" }
          //             ]
          //         }
          //     }
          //
          const orderbook = this.safeValue (response, 'data', {});
          return this.parseOrderBook (orderbook, symbol, undefined, 'bids', 'asks', 'price', 'quantity');
      }
  
      parseTrade (trade, market = undefined) {
          //
          // fetchTrades (public)
          //
          //     {
          //         "id": 38199941,
          //         "price": "3378.67",
          //         "amount": "0.019812",
          //         "taker_side": "ASK",
          //         "created_at": "2019-01-29T06:05:56Z"
          //     }
          //
          // fetchMyTrades (private)
          //
          //     {
          //         "id": 10854280,
          //         "asset_pair_name": "XIN-USDT",
          //         "price": "70",
          //         "amount": "1",
          //         "taker_side": "ASK",
          //         "maker_order_id": 58284908,
          //         "taker_order_id": 58284909,
          //         "maker_fee": "0.0008",
          //         "taker_fee": "0.07",
          //         "side": "SELF_TRADING",
          //         "inserted_at": "2019-04-16T12:00:01Z"
          //     },
          //
          //     {
          //         "id": 10854263,
          //         "asset_pair_name": "XIN-USDT",
          //         "price": "75.7",
          //         "amount": "12.743149",
          //         "taker_side": "BID",
          //         "maker_order_id": null,
          //         "taker_order_id": 58284888,
          //         "maker_fee": null,
          //         "taker_fee": "0.0025486298",
          //         "side": "BID",
          //         "inserted_at": "2019-04-15T06:20:57Z"
          //     }
          //
          const timestamp = this.parse8601 (this.safeString2 (trade, 'created_at', 'inserted_at'));
          const priceString = this.safeString (trade, 'price');
          const amountString = this.safeString (trade, 'amount');
          const marketId = this.safeString (trade, 'asset_pair_name');
          const symbol = this.safeSymbol (marketId, market, '-');
          let side = this.safeString (trade, 'side');
          const takerSide = this.safeString (trade, 'taker_side');
          let takerOrMaker = undefined;
          if ((takerSide !== undefined) && (side !== undefined) && (side !== 'SELF_TRADING')) {
              takerOrMaker = (takerSide === side) ? 'taker' : 'maker';
          }
          if (side === undefined) {
              // taker side is not related to buy/sell side
              // the following code is probably a mistake
              side = (takerSide === 'ASK') ? 'sell' : 'buy';
          } else {
              if (side === 'BID') {
                  side = 'buy';
              } else if (side === 'ASK') {
                  side = 'sell';
              }
          }
          const makerOrderId = this.safeString (trade, 'maker_order_id');
          const takerOrderId = this.safeString (trade, 'taker_order_id');
          let orderId = undefined;
          if (makerOrderId !== undefined) {
              if (takerOrderId !== undefined) {
                  orderId = [ makerOrderId, takerOrderId ];
              } else {
                  orderId = makerOrderId;
              }
          } else if (takerOrderId !== undefined) {
              orderId = takerOrderId;
          }
          const id = this.safeString (trade, 'id');
          const result = {
              'id': id,
              'timestamp': timestamp,
              'datetime': this.iso8601 (timestamp),
              'symbol': symbol,
              'order': orderId,
              'type': 'limit',
              'side': side,
              'takerOrMaker': takerOrMaker,
              'price': priceString,
              'amount': amountString,
              'cost': undefined,
              'info': trade,
          };
          let makerCurrencyCode = undefined;
          let takerCurrencyCode = undefined;
          if ((market !== undefined) && (takerOrMaker !== undefined)) {
              if (side === 'buy') {
                  if (takerOrMaker === 'maker') {
                      makerCurrencyCode = market['base'];
                      takerCurrencyCode = market['quote'];
                  } else {
                      makerCurrencyCode = market['quote'];
                      takerCurrencyCode = market['base'];
                  }
              } else {
                  if (takerOrMaker === 'maker') {
                      makerCurrencyCode = market['quote'];
                      takerCurrencyCode = market['base'];
                  } else {
                      makerCurrencyCode = market['base'];
                      takerCurrencyCode = market['quote'];
                  }
              }
          } else if (side === 'SELF_TRADING') {
              if (takerSide === 'BID') {
                  makerCurrencyCode = market['quote'];
                  takerCurrencyCode = market['base'];
              } else if (takerSide === 'ASK') {
                  makerCurrencyCode = market['base'];
                  takerCurrencyCode = market['quote'];
              }
          }
          const makerFeeCost = this.safeString (trade, 'maker_fee');
          const takerFeeCost = this.safeString (trade, 'taker_fee');
          if (makerFeeCost !== undefined) {
              if (takerFeeCost !== undefined) {
                  result['fees'] = [
                      { 'cost': makerFeeCost, 'currency': makerCurrencyCode },
                      { 'cost': takerFeeCost, 'currency': takerCurrencyCode },
                  ];
              } else {
                  result['fee'] = { 'cost': makerFeeCost, 'currency': makerCurrencyCode };
              }
          } else if (takerFeeCost !== undefined) {
              result['fee'] = { 'cost': takerFeeCost, 'currency': takerCurrencyCode };
          } else {
              result['fee'] = undefined;
          }
          return this.safeTrade (result, market);
      }
  
      async fetchTrades (symbol, since = undefined, limit = undefined, params = {}) {
          await this.loadMarkets ();
          const market = this.market (symbol);
          const request = {
              'asset_pair_name': market['id'],
          };
          const response = await this.publicGetAssetPairsAssetPairNameTrades (this.extend (request, params));
          //
          //     {
          //         "code": 0,
          //         "data": [
          //             {
          //                 "id": 38199941,
          //                 "price": "3378.67",
          //                 "amount": "0.019812",
          //                 "taker_side": "ASK",
          //                 "created_at": "2019-01-29T06:05:56Z"
          //             },
          //             {
          //                 "id": 38199934,
          //                 "price": "3376.14",
          //                 "amount": "0.019384",
          //                 "taker_side": "ASK",
          //                 "created_at": "2019-01-29T06:05:40Z"
          //             }
          //         ]
          //     }
          //
          const trades = this.safeValue (response, 'data', []);
          return this.parseTrades (trades, market, since, limit);
      }
  
      parseOHLCV (ohlcv, market = undefined) {
          //
          //     {
          //         close: '0.021562',
          //         high: '0.021563',
          //         low: '0.02156',
          //         open: '0.021563',
          //         time: '2019-11-21T07:54:00Z',
          //         volume: '59.84376'
          //     }
          //
          return [
              this.parse8601 (this.safeString (ohlcv, 'time')),
              this.safeNumber (ohlcv, 'open'),
              this.safeNumber (ohlcv, 'high'),
              this.safeNumber (ohlcv, 'low'),
              this.safeNumber (ohlcv, 'close'),
              this.safeNumber (ohlcv, 'volume'),
          ];
      }
  
      async fetchOHLCV (symbol, timeframe = '1m', since = undefined, limit = undefined, params = {}) {
          await this.loadMarkets ();
          const market = this.market (symbol);
          if (limit === undefined) {
              limit = 100; // default 100, max 500
          }
          const request = {
              'asset_pair_name': market['id'],
              'period': this.timeframes[timeframe],
              'limit': limit,
          };
          if (since !== undefined) {
              // const start = parseInt (since / 1000);
              const duration = this.parseTimeframe (timeframe);
              const end = this.sum (since, limit * duration * 1000);
              request['time'] = this.iso8601 (end);
          }
          const response = await this.publicGetAssetPairsAssetPairNameCandles (this.extend (request, params));
          //
          //     {
          //         code: 0,
          //         data: [
          //             {
          //                 close: '0.021656',
          //                 high: '0.021658',
          //                 low: '0.021652',
          //                 open: '0.021652',
          //                 time: '2019-11-21T09:30:00Z',
          //                 volume: '53.08664'
          //             },
          //             {
          //                 close: '0.021652',
          //                 high: '0.021656',
          //                 low: '0.021652',
          //                 open: '0.021656',
          //                 time: '2019-11-21T09:29:00Z',
          //                 volume: '88.39861'
          //             },
          //         ]
          //     }
          //
          const data = this.safeValue (response, 'data', []);
          return this.parseOHLCVs (data, market, timeframe, since, limit);
      }
  
      async fetchBalance (params = {}) {
          await this.loadMarkets ();
          const type = this.safeString (params, 'type', '');
          params = this.omit (params, 'type');
          const method = 'privateGet' + this.capitalize (type) + 'Accounts';
          const response = await this[method] (params);
          //
          //     {
          //         "code":0,
          //         "data":[
          //             {"asset_symbol":"NKC","balance":"0","locked_balance":"0"},
          //             {"asset_symbol":"UBTC","balance":"0","locked_balance":"0"},
          //             {"asset_symbol":"READ","balance":"0","locked_balance":"0"},
          //         ],
          //     }
          //
          const result = {
              'info': response,
              'timestamp': undefined,
              'datetime': undefined,
          };
          const balances = this.safeValue (response, 'data', []);
          for (let i = 0; i < balances.length; i++) {
              const balance = balances[i];
              const symbol = this.safeString (balance, 'asset_symbol');
              const code = this.safeCurrencyCode (symbol);
              const account = this.account ();
              account['total'] = this.safeString (balance, 'balance');
              account['used'] = this.safeString (balance, 'locked_balance');
              result[code] = account;
          }
          return this.parseBalance (result);
      }
  
      parseOrder (order, market = undefined) {
          //
          //    {
          //        "id": 10,
          //        "asset_pair_name": "EOS-BTC",
          //        "price": "10.00",
          //        "amount": "10.00",
          //        "filled_amount": "9.0",
          //        "avg_deal_price": "12.0",
          //        "side": "ASK",
          //        "state": "FILLED",
          //        "created_at":"2019-01-29T06:05:56Z",
          //        "updated_at":"2019-01-29T06:05:56Z",
          //    }
          //
          const id = this.safeString (order, 'id');
          const marketId = this.safeString (order, 'asset_pair_name');
          const symbol = this.safeSymbol (marketId, market, '-');
          const timestamp = this.parse8601 (this.safeString (order, 'created_at'));
          const price = this.safeString (order, 'price');
          const amount = this.safeString (order, 'amount');
          const average = this.safeString (order, 'avg_deal_price');
          const filled = this.safeString (order, 'filled_amount');
          const status = this.parseOrderStatus (this.safeString (order, 'state'));
          let side = this.safeString (order, 'side');
          if (side === 'BID') {
              side = 'buy';
          } else {
              side = 'sell';
          }
          const lastTradeTimestamp = this.parse8601 (this.safeString (order, 'updated_at'));
          return this.safeOrder2 ({
              'info': order,
              'id': id,
              'clientOrderId': undefined,
              'timestamp': timestamp,
              'datetime': this.iso8601 (timestamp),
              'lastTradeTimestamp': lastTradeTimestamp,
              'symbol': symbol,
              'type': undefined,
              'timeInForce': undefined,
              'postOnly': undefined,
              'side': side,
              'price': price,
              'stopPrice': undefined,
              'amount': amount,
              'cost': undefined,
              'average': average,
              'filled': filled,
              'remaining': undefined,
              'status': status,
              'fee': undefined,
              'trades': undefined,
          }, market);
      }
  
      async createOrder (symbol, type, side, amount, price = undefined, params = {}) {
          await this.loadMarkets ();
          const market = this.market (symbol);
          side = (side === 'buy') ? 'BID' : 'ASK';
          const uppercaseType = type.toUpperCase ();
          const request = {
              'asset_pair_name': market['id'], // asset pair name BTC-USDT, required
              'side': side, // order side one of "ASK"/"BID", required
              'amount': this.amountToPrecision (symbol, amount), // order amount, string, required
              // 'price': this.priceToPrecision (symbol, price), // order price, string, required
              'type': uppercaseType,
              // 'operator': 'GTE', // stop orders only, GTE greater than and equal, LTE less than and equal
              // 'immediate_or_cancel': false, // limit orders only, must be false when post_only is true
              // 'post_only': false, // limit orders only, must be false when immediate_or_cancel is true
          };
          if (uppercaseType === 'LIMIT') {
              request['price'] = this.priceToPrecision (symbol, price);
          } else {
              const isStopLimit = (uppercaseType === 'STOP_LIMIT');
              const isStopMarket = (uppercaseType === 'STOP_MARKET');
              if (isStopLimit || isStopMarket) {
                  const stopPrice = this.safeNumber2 (params, 'stop_price', 'stopPrice');
                  if (stopPrice === undefined) {
                      throw new ArgumentsRequired (this.id + ' createOrder() requires a stop_price parameter');
                  }
                  request['stop_price'] = this.priceToPrecision (symbol, stopPrice);
                  params = this.omit (params, [ 'stop_price', 'stopPrice' ]);
              }
              if (isStopLimit) {
                  request['price'] = this.priceToPrecision (symbol, price);
              }
          }
          const response = await this.privatePostOrders (this.extend (request, params));
          //
          //    {
          //        "id": 10,
          //        "asset_pair_name": "EOS-BTC",
          //        "price": "10.00",
          //        "amount": "10.00",
          //        "filled_amount": "9.0",
          //        "avg_deal_price": "12.0",
          //        "side": "ASK",
          //        "state": "FILLED",
          //        "created_at":"2019-01-29T06:05:56Z",
          //        "updated_at":"2019-01-29T06:05:56Z"
          //    }
          //
          const order = this.safeValue (response, 'data');
          return this.parseOrder (order, market);
      }
  
      async cancelOrder (id, symbol = undefined, params = {}) {
          await this.loadMarkets ();
          const request = { 'id': id };
          const response = await this.privatePostOrdersIdCancel (this.extend (request, params));
          //    {
          //        "id": 10,
          //        "asset_pair_name": "EOS-BTC",
          //        "price": "10.00",
          //        "amount": "10.00",
          //        "filled_amount": "9.0",
          //        "avg_deal_price": "12.0",
          //        "side": "ASK",
          //        "state": "CANCELLED",
          //        "created_at":"2019-01-29T06:05:56Z",
          //        "updated_at":"2019-01-29T06:05:56Z"
          //    }
          const order = this.safeValue (response, 'data');
          return this.parseOrder (order);
      }
  
      async cancelAllOrders (symbol = undefined, params = {}) {
          await this.loadMarkets ();
          const market = this.market (symbol);
          const request = {
              'asset_pair_name': market['id'],
          };
          const response = await this.privatePostOrdersCancel (this.extend (request, params));
          //
          //     {
          //         "code":0,
          //         "data": {
          //             "cancelled":[
          //                 58272370,
          //                 58272377
          //             ],
          //             "failed": []
          //         }
          //     }
          //
          return response;
      }
  
      async fetchOrder (id, symbol = undefined, params = {}) {
          await this.loadMarkets ();
          const request = { 'id': id };
          const response = await this.privateGetOrdersId (this.extend (request, params));
          const order = this.safeValue (response, 'data', {});
          return this.parseOrder (order);
      }
  
      async fetchOrders (symbol = undefined, since = undefined, limit = undefined, params = {}) {
          if (symbol === undefined) {
              throw new ArgumentsRequired (this.id + ' fetchOrders() requires a symbol argument');
          }
          await this.loadMarkets ();
          const market = this.market (symbol);
          const request = {
              'asset_pair_name': market['id'],
              // 'page_token': 'dxzef', // request page after this page token
              // 'side': 'ASK', // 'ASK' or 'BID', optional
              // 'state': 'FILLED', // 'CANCELLED', 'FILLED', 'PENDING'
              // 'limit' 20, // default 20, max 200
          };
          if (limit !== undefined) {
              request['limit'] = limit; // default 20, max 200
          }
          const response = await this.privateGetOrders (this.extend (request, params));
          //
          //    {
          //        "code":0,
          //        "data": [
          //             {
          //                 "id": 10,
          //                 "asset_pair_name": "ETH-BTC",
          //                 "price": "10.00",
          //                 "amount": "10.00",
          //                 "filled_amount": "9.0",
          //                 "avg_deal_price": "12.0",
          //                 "side": "ASK",
          //                 "state": "FILLED",
          //                 "created_at":"2019-01-29T06:05:56Z",
          //                 "updated_at":"2019-01-29T06:05:56Z",
          //             },
          //         ],
          //        "page_token":"dxzef",
          //    }
          //
          const orders = this.safeValue (response, 'data', []);
          return this.parseOrders (orders, market, since, limit);
      }
  
      async fetchMyTrades (symbol = undefined, since = undefined, limit = undefined, params = {}) {
          await this.loadMarkets ();
          if (symbol === undefined) {
              throw new ArgumentsRequired (this.id + ' fetchMyTrades() requires a symbol argument');
          }
          const market = this.market (symbol);
          const request = {
              'asset_pair_name': market['id'],
              // 'page_token': 'dxzef', // request page after this page token
          };
          if (limit !== undefined) {
              request['limit'] = limit; // default 20, max 200
          }
          const response = await this.privateGetTrades (this.extend (request, params));
          //
          //     {
          //         "code": 0,
          //         "data": [
          //             {
          //                 "id": 10854280,
          //                 "asset_pair_name": "XIN-USDT",
          //                 "price": "70",
          //                 "amount": "1",
          //                 "taker_side": "ASK",
          //                 "maker_order_id": 58284908,
          //                 "taker_order_id": 58284909,
          //                 "maker_fee": "0.0008",
          //                 "taker_fee": "0.07",
          //                 "side": "SELF_TRADING",
          //                 "inserted_at": "2019-04-16T12:00:01Z"
          //             },
          //             {
          //                 "id": 10854263,
          //                 "asset_pair_name": "XIN-USDT",
          //                 "price": "75.7",
          //                 "amount": "12.743149",
          //                 "taker_side": "BID",
          //                 "maker_order_id": null,
          //                 "taker_order_id": 58284888,
          //                 "maker_fee": null,
          //                 "taker_fee": "0.0025486298",
          //                 "side": "BID",
          //                 "inserted_at": "2019-04-15T06:20:57Z"
          //             }
          //         ],
          //         "page_token":"dxfv"
          //     }
          //
          const trades = this.safeValue (response, 'data', []);
          return this.parseTrades (trades, market, since, limit);
      }
  
      parseOrderStatus (status) {
          const statuses = {
              'PENDING': 'open',
              'FILLED': 'closed',
              'CANCELLED': 'canceled',
          };
          return this.safeString (statuses, status);
      }
  
      async fetchOpenOrders (symbol = undefined, since = undefined, limit = undefined, params = {}) {
          const request = {
              'state': 'PENDING',
          };
          return await this.fetchOrders (symbol, since, limit, this.extend (request, params));
      }
  
      async fetchClosedOrders (symbol = undefined, since = undefined, limit = undefined, params = {}) {
          const request = {
              'state': 'FILLED',
          };
          return await this.fetchOrders (symbol, since, limit, this.extend (request, params));
      }
  
      nonce () {
          return this.microseconds () * 1000;
      }
  
      sign (path, api = 'public', method = 'GET', params = {}, headers = undefined, body = undefined) {
          const query = this.omit (params, this.extractParams (path));
          const baseUrl = this.implodeHostname (this.urls['api'][api]);
          let url = baseUrl + '/' + this.implodeParams (path, params);
          if (api === 'public') {
              if (Object.keys (query).length) {
                  url += '?' + this.urlencode (query);
              }
          } else {
              this.checkRequiredCredentials ();
              const nonce = this.nonce ().toString ();
              const request = {
                  'type': 'OpenAPIV2',
                  'sub': this.apiKey,
                  'nonce': nonce,
                  // 'recv_window': '30', // default 30
              };
              const jwt = this.jwt (request, this.encode (this.secret));
              headers = {
                  'Authorization': 'Bearer ' + jwt,
              };
              if (method === 'GET') {
                  if (Object.keys (query).length) {
                      url += '?' + this.urlencode (query);
                  }
              } else if (method === 'POST') {
                  headers['Content-Type'] = 'application/json';
                  body = this.json (query);
              }
          }
          return { 'url': url, 'method': method, 'body': body, 'headers': headers };
      }
  
      async fetchDepositAddress (code, params = {}) {
          await this.loadMarkets ();
          const currency = this.currency (code);
          const request = {
              'asset_symbol': currency['id'],
          };
          const response = await this.privateGetAssetsAssetSymbolAddress (this.extend (request, params));
          //
          // the actual response format is not the same as the documented one
          // the data key contains an array in the actual response
          //
          //     {
          //         "code":0,
          //         "message":"",
          //         "data":[
          //             {
          //                 "id":5521878,
          //                 "chain":"Bitcoin",
          //                 "value":"1GbmyKoikhpiQVZ1C9sbF17mTyvBjeobVe",
          //                 "memo":""
          //             }
          //         ]
          //     }
          //
          const data = this.safeValue (response, 'data', []);
          const dataLength = data.length;
          if (dataLength < 1) {
              throw new ExchangeError (this.id + 'fetchDepositAddress() returned empty address response');
          }
          const firstElement = data[0];
          const address = this.safeString (firstElement, 'value');
          const tag = this.safeString (firstElement, 'memo');
          this.checkAddress (address);
          return {
              'currency': code,
              'address': address,
              'tag': tag,
              'network': undefined,
              'info': response,
          };
      }
  
      parseTransactionStatus (status) {
          const statuses = {
              // what are other statuses here?
              'WITHHOLD': 'ok', // deposits
              'UNCONFIRMED': 'pending',
              'CONFIRMED': 'ok', // withdrawals
              'COMPLETED': 'ok',
              'PENDING': 'pending',
          };
          return this.safeString (statuses, status, status);
      }
  
      parseTransaction (transaction, currency = undefined) {
          //
          // fetchDeposits
          //
          //     {
          //         "amount": "25.0",
          //         "asset_symbol": "BTS"
          //         "confirms": 100,
          //         "id": 5,
          //         "inserted_at": "2018-02-16T11:39:58.000Z",
          //         "is_internal": false,
          //         "kind": "default",
          //         "memo": "",
          //         "state": "WITHHOLD",
          //         "txid": "72e03037d144dae3d32b68b5045462b1049a0755",
          //         "updated_at": "2018-11-09T10:20:09.000Z",
          //     }
          //
          // fetchWithdrawals
          //
          //     {
          //         "amount": "5",
          //         "asset_symbol": "ETH",
          //         "completed_at": "2018-03-15T16:13:45.610463Z",
          //         "customer_id": "10",
          //         "id": 10,
          //         "inserted_at": "2018-03-15T16:13:45.610463Z",
          //         "is_internal": true,
          //         "note": "2018-03-15T16:13:45.610463Z",
          //         "state": "CONFIRMED",
          //         "target_address": "0x4643bb6b393ac20a6175c713175734a72517c63d6f7"
          //         "txid": "0x4643bb6b393ac20a6175c713175734a72517c63d6f73a3ca90a15356f2e967da0",
          //     }
          //
          // withdraw
          //
          //     {
          //         "id":1077391,
          //         "customer_id":1082679,
          //         "amount":"21.9000000000000000",
          //         "txid":"",
          //         "is_internal":false,
          //         "kind":"on_chain",
          //         "state":"PENDING",
          //         "inserted_at":"2020-06-03T00:50:57+00:00",
          //         "updated_at":"2020-06-03T00:50:57+00:00",
          //         "memo":"",
          //         "target_address":"rDYtYT3dBeuw376rvHqoZBKW3UmvguoBAf",
          //         "fee":"0.1000000000000000",
          //         "asset_symbol":"XRP"
          //     }
          //
          const currencyId = this.safeString (transaction, 'asset_symbol');
          const code = this.safeCurrencyCode (currencyId);
          const id = this.safeInteger (transaction, 'id');
          const amount = this.safeNumber (transaction, 'amount');
          const status = this.parseTransactionStatus (this.safeString (transaction, 'state'));
          const timestamp = this.parse8601 (this.safeString (transaction, 'inserted_at'));
          const updated = this.parse8601 (this.safeString2 (transaction, 'updated_at', 'completed_at'));
          const txid = this.safeString (transaction, 'txid');
          const address = this.safeString (transaction, 'target_address');
          const tag = this.safeString (transaction, 'memo');
          const type = ('customer_id' in transaction) ? 'deposit' : 'withdrawal';
          return {
              'info': transaction,
              'id': id,
              'txid': txid,
              'timestamp': timestamp,
              'datetime': this.iso8601 (timestamp),
              'addressFrom': undefined,
              'address': undefined,
              'addressTo': address,
              'tagFrom': undefined,
              'tag': tag,
              'tagTo': undefined,
              'type': type,
              'amount': amount,
              'currency': code,
              'status': status,
              'updated': updated,
              'fee': undefined,
          };
      }
  
      async fetchDeposits (code = undefined, since = undefined, limit = undefined, params = {}) {
          await this.loadMarkets ();
          const request = {
              // 'page_token': 'dxzef', // request page after this page token
              // 'limit': 50, // optional, default 50
              // 'kind': 'string', // optional - air_drop, big_holder_dividend, default, eosc_to_eos, internal, equally_airdrop, referral_mining, one_holder_dividend, single_customer, snapshotted_airdrop, trade_mining
              // 'asset_symbol': 'BTC', // optional
          };
          let currency = undefined;
          if (code !== undefined) {
              currency = this.currency (code);
              request['asset_symbol'] = currency['id'];
          }
          if (limit !== undefined) {
              request['limit'] = limit; // default 50
          }
          const response = await this.privateGetDeposits (this.extend (request, params));
          //
          //     {
          //         "code": 0,
          //         "page_token": "NQ==",
          //         "data": [
          //             {
          //                 "id": 5,
          //                 "amount": "25.0",
          //                 "confirms": 100,
          //                 "txid": "72e03037d144dae3d32b68b5045462b1049a0755",
          //                 "is_internal": false,
          //                 "inserted_at": "2018-02-16T11:39:58.000Z",
          //                 "updated_at": "2018-11-09T10:20:09.000Z",
          //                 "kind": "default",
          //                 "memo": "",
          //                 "state": "WITHHOLD",
          //                 "asset_symbol": "BTS"
          //             }
          //         ]
          //     }
          //
          const deposits = this.safeValue (response, 'data', []);
          return this.parseTransactions (deposits, code, since, limit);
      }
  
      async fetchWithdrawals (code = undefined, since = undefined, limit = undefined, params = {}) {
          await this.loadMarkets ();
          const request = {
              // 'page_token': 'dxzef', // request page after this page token
              // 'limit': 50, // optional, default 50
              // 'kind': 'string', // optional - air_drop, big_holder_dividend, default, eosc_to_eos, internal, equally_airdrop, referral_mining, one_holder_dividend, single_customer, snapshotted_airdrop, trade_mining
              // 'asset_symbol': 'BTC', // optional
          };
          let currency = undefined;
          if (code !== undefined) {
              currency = this.currency (code);
              request['asset_symbol'] = currency['id'];
          }
          if (limit !== undefined) {
              request['limit'] = limit; // default 50
          }
          const response = await this.privateGetWithdrawals (this.extend (request, params));
          //
          //     {
          //         "code": 0,
          //         "data": [
          //             {
          //                 "id": 10,
          //                 "customer_id": "10",
          //                 "asset_symbol": "ETH",
          //                 "amount": "5",
          //                 "state": "CONFIRMED",
          //                 "note": "2018-03-15T16:13:45.610463Z",
          //                 "txid": "0x4643bb6b393ac20a6175c713175734a72517c63d6f73a3ca90a15356f2e967da0",
          //                 "completed_at": "2018-03-15T16:13:45.610463Z",
          //                 "inserted_at": "2018-03-15T16:13:45.610463Z",
          //                 "is_internal": true,
          //                 "target_address": "0x4643bb6b393ac20a6175c713175734a72517c63d6f7"
          //             }
          //         ],
          //         "page_token":"dxvf"
          //     }
          //
          const withdrawals = this.safeValue (response, 'data', []);
          return this.parseTransactions (withdrawals, code, since, limit);
      }
  
      async withdraw (code, amount, address, tag = undefined, params = {}) {
          [ tag, params ] = this.handleWithdrawTagAndParams (tag, params);
          await this.loadMarkets ();
          const currency = this.currency (code);
          const request = {
              'symbol': currency['id'],
              'target_address': address,
              'amount': this.currencyToPrecision (code, amount),
          };
          if (tag !== undefined) {
              request['memo'] = tag;
          }
          // requires write permission on the wallet
          const response = await this.privatePostWithdrawals (this.extend (request, params));
          //
          //     {
          //         "code":0,
          //         "message":"",
          //         "data":{
          //             "id":1077391,
          //             "customer_id":1082679,
          //             "amount":"21.9000000000000000",
          //             "txid":"",
          //             "is_internal":false,
          //             "kind":"on_chain",
          //             "state":"PENDING",
          //             "inserted_at":"2020-06-03T00:50:57+00:00",
          //             "updated_at":"2020-06-03T00:50:57+00:00",
          //             "memo":"",
          //             "target_address":"rDYtYT3dBeuw376rvHqoZBKW3UmvguoBAf",
          //             "fee":"0.1000000000000000",
          //             "asset_symbol":"XRP"
          //         }
          //     }
          //
          const data = this.safeValue (response, 'data', {});
          return this.parseTransaction (data, currency);
      }
  
      handleErrors (httpCode, reason, url, method, headers, body, response, requestHeaders, requestBody) {
          if (response === undefined) {
              return; // fallback to default error handler
          }
          //
          //      {"code":10013,"message":"Resource not found"}
          //      {"code":40004,"message":"invalid jwt"}
          //
          const code = this.safeString (response, 'code');
          const message = this.safeString (response, 'message');
          if (code !== '0') {
              const feedback = this.id + ' ' + body;
              this.throwExactlyMatchedException (this.exceptions['exact'], message, feedback);
              this.throwExactlyMatchedException (this.exceptions['exact'], code, feedback);
              this.throwBroadlyMatchedException (this.exceptions['broad'], message, feedback);
              throw new ExchangeError (feedback); // unknown message
          }
      }
  };
  