text: 'use strict';
  
  // ---------------------------------------------------------------------------
  
  const Exchange = require ('./base/Exchange');
  const { PAD_WITH_ZERO } = require ('./base/functions/number');
  const { InvalidOrder, InsufficientFunds, ExchangeError, ExchangeNotAvailable, DDoSProtection, BadRequest, NotSupported, InvalidAddress, AuthenticationError } = require ('./base/errors');
  
  // ---------------------------------------------------------------------------
  
  module.exports = class idex extends Exchange {
      describe () {
          return this.deepExtend (super.describe (), {
              'id': 'idex',
              'name': 'IDEX',
              'countries': [ 'US' ],
              'rateLimit': 1500,
              'version': 'v2',
              'certified': true,
              'pro': true,
              'requiresWeb3': true,
              'has': {
                  'cancelOrder': true,
                  'createOrder': true,
                  'fetchBalance': true,
                  'fetchMarkets': true,
                  'fetchCurrencies': true,
                  'fetchMyTrades': true,
                  'fetchOHLCV': true,
                  'fetchOpenOrders': true,
                  'fetchClosedOrders': true,
                  'fetchOrders': false,
                  'fetchOrder': true,
                  'fetchOrderBook': true,
                  'fetchTicker': true,
                  'fetchTickers': true,
                  'fetchTrades': true,
                  'fetchTransactions': false,
                  'fetchDeposits': true,
                  'fetchWithdrawals': true,
                  'withdraw': true,
              },
              'timeframes': {
                  '1m': '1m',
                  '5m': '5m',
                  '15m': '15m',
                  '30m': '30m',
                  '1h': '1h',
                  '6h': '6h',
                  '1d': '1d',
              },
              'urls': {
                  'test': {
                      'public': 'https://api-sandbox.idex.io',
                      'private': 'https://api-sandbox.idex.io',
                  },
                  'logo': 'https://user-images.githubusercontent.com/51840849/94481303-2f222100-01e0-11eb-97dd-bc14c5943a86.jpg',
                  'api': {
                      'ETH': 'https://api-eth.idex.io',
                      'BSC': 'https://api-bsc.idex.io',
                  },
                  'www': 'https://idex.io',
                  'doc': [
                      'https://docs.idex.io/',
                  ],
              },
              'api': {
                  'public': {
                      'get': [
                          'ping',
                          'time',
                          'exchange',
                          'assets',
                          'markets',
                          'tickers',
                          'candles',
                          'trades',
                          'orderbook',
                          'wsToken',
                      ],
                  },
                  'private': {
                      'get': [
                          'user',
                          'wallets',
                          'balances',
                          'orders',
                          'fills',
                          'deposits',
                          'withdrawals',
                      ],
                      'post': [
                          'wallets',
                          'orders',
                          'orders/test',
                          'withdrawals',
                      ],
                      'delete': [
                          'orders',
                      ],
                  },
              },
              'options': {
                  'defaultTimeInForce': 'gtc',
                  'defaultSelfTradePrevention': 'cn',
                  'network': 'ETH', // also supports BSC
              },
              'exceptions': {
                  'INVALID_ORDER_QUANTITY': InvalidOrder,
                  'INSUFFICIENT_FUNDS': InsufficientFunds,
                  'SERVICE_UNAVAILABLE': ExchangeNotAvailable,
                  'EXCEEDED_RATE_LIMIT': DDoSProtection,
                  'INVALID_PARAMETER': BadRequest,
                  'WALLET_NOT_ASSOCIATED': InvalidAddress,
                  'INVALID_WALLET_SIGNATURE': AuthenticationError,
              },
              'requiredCredentials': {
                  'walletAddress': true,
                  'privateKey': true,
                  'apiKey': true,
                  'secret': true,
              },
              'paddingMode': PAD_WITH_ZERO,
              'commonCurrencies': {},
              'requireCredentials': {
                  'privateKey': true,
                  'apiKey': true,
                  'secret': true,
              },
          });
      }
  
      async fetchMarkets (params = {}) {
          // [
          //   {
          //     market: 'DIL-ETH',
          //     status: 'active',
          //     baseAsset: 'DIL',
          //     baseAssetPrecision: 8,
          //     quoteAsset: 'ETH',
          //     quoteAssetPrecision: 8
          //   }, ...
          // ]
          const response = await this.publicGetMarkets (params);
          const result = [];
          for (let i = 0; i < response.length; i++) {
              const entry = response[i];
              const marketId = this.safeString (entry, 'market');
              const baseId = this.safeString (entry, 'baseAsset');
              const quoteId = this.safeString (entry, 'quoteAsset');
              const base = this.safeCurrencyCode (baseId);
              const quote = this.safeCurrencyCode (quoteId);
              const symbol = base + '/' + quote;
              const basePrecision = this.safeInteger (entry, 'baseAssetPrecision');
              const quotePrecision = this.safeInteger (entry, 'quoteAssetPrecision');
              const status = this.safeString (entry, 'status');
              const active = status === 'active';
              const precision = {
                  'amount': basePrecision,
                  'price': quotePrecision,
              };
              result.push ({
                  'symbol': symbol,
                  'id': marketId,
                  'base': base,
                  'quote': quote,
                  'baseId': baseId,
                  'quoteId': quoteId,
                  'active': active,
                  'info': entry,
                  'precision': precision,
                  'limits': {
                      'amount': {
                          'min': Math.pow (10, -precision['amount']),
                          'max': undefined,
                      },
                      'price': {
                          'min': undefined,
                          'max': undefined,
                      },
                      'cost': {
                          'min': undefined,
                          'max': undefined,
                      },
                  },
              });
          }
          return result;
      }
  
      async fetchTicker (symbol, params = {}) {
          await this.loadMarkets ();
          const market = this.market (symbol);
          const request = {
              'market': market['id'],
          };
          // [
          //   {
          //     market: 'DIL-ETH',
          //     time: 1598367493008,
          //     open: '0.09695361',
          //     high: '0.10245881',
          //     low: '0.09572507',
          //     close: '0.09917079',
          //     closeQuantity: '0.71320950',
          //     baseVolume: '309.17380612',
          //     quoteVolume: '30.57633981',
          //     percentChange: '2.28',
          //     numTrades: 205,
          //     ask: '0.09910476',
          //     bid: '0.09688340',
          //     sequence: 3902
          //   }
          // ]
          const response = await this.publicGetTickers (this.extend (request, params));
          const ticker = this.safeValue (response, 0);
          return this.parseTicker (ticker, market);
      }
  
      async fetchTickers (symbols = undefined, params = {}) {
          await this.loadMarkets ();
          // [
          //   {
          //     market: 'DIL-ETH',
          //     time: 1598367493008,
          //     open: '0.09695361',
          //     high: '0.10245881',
          //     low: '0.09572507',
          //     close: '0.09917079',
          //     closeQuantity: '0.71320950',
          //     baseVolume: '309.17380612',
          //     quoteVolume: '30.57633981',
          //     percentChange: '2.28',
          //     numTrades: 205,
          //     ask: '0.09910476',
          //     bid: '0.09688340',
          //     sequence: 3902
          //   }, ...
          // ]
          const response = await this.publicGetTickers (params);
          return this.parseTickers (response, symbols);
      }
  
      parseTicker (ticker, market = undefined) {
          // {
          //   market: 'DIL-ETH',
          //   time: 1598367493008,
          //   open: '0.09695361',
          //   high: '0.10245881',
          //   low: '0.09572507',
          //   close: '0.09917079',
          //   closeQuantity: '0.71320950',
          //   baseVolume: '309.17380612',
          //   quoteVolume: '30.57633981',
          //   percentChange: '2.28',
          //   numTrades: 205,
          //   ask: '0.09910476',
          //   bid: '0.09688340',
          //   sequence: 3902
          // }
          const marketId = this.safeString (ticker, 'market');
          const symbol = this.safeSymbol (marketId, market, '-');
          const baseVolume = this.safeFloat (ticker, 'baseVolume');
          const quoteVolume = this.safeFloat (ticker, 'quoteVolume');
          const timestamp = this.safeInteger (ticker, 'time');
          const open = this.safeFloat (ticker, 'open');
          const high = this.safeFloat (ticker, 'high');
          const low = this.safeFloat (ticker, 'low');
          const close = this.safeFloat (ticker, 'close');
          const ask = this.safeFloat (ticker, 'ask');
          const bid = this.safeFloat (ticker, 'bid');
          let percentage = this.safeFloat (ticker, 'percentChange');
          if (percentage !== undefined) {
              percentage = 1 + percentage / 100;
          }
          let change = undefined;
          if ((close !== undefined) && (open !== undefined)) {
              change = close - open;
          }
          return {
              'symbol': symbol,
              'timestamp': timestamp,
              'datetime': this.iso8601 (timestamp),
              'high': high,
              'low': low,
              'bid': bid,
              'bidVolume': undefined,
              'ask': ask,
              'askVolume': undefined,
              'vwap': undefined,
              'open': open,
              'close': close,
              'last': close,
              'previousClose': undefined,
              'change': change,
              'percentage': percentage,
              'average': undefined,
              'baseVolume': baseVolume,
              'quoteVolume': quoteVolume,
              'info': ticker,
          };
      }
  
      async fetchOHLCV (symbol, timeframe = '1m', since = undefined, limit = undefined, params = {}) {
          await this.loadMarkets ();
          const market = this.market (symbol);
          const request = {
              'market': market['id'],
              'interval': timeframe,
          };
          if (since !== undefined) {
              request['start'] = since;
          }
          if (limit !== undefined) {
              request['limit'] = limit;
          }
          const response = await this.publicGetCandles (this.extend (request, params));
          if (Array.isArray (response)) {
              // [
              //   {
              //     start: 1598345580000,
              //     open: '0.09771286',
              //     high: '0.09771286',
              //     low: '0.09771286',
              //     close: '0.09771286',
              //     volume: '1.45340410',
              //     sequence: 3853
              //   }, ...
              // ]
              return this.parseOHLCVs (response, market, timeframe, since, limit);
          } else {
              //  {"nextTime":1595536440000}
              return [];
          }
      }
  
      parseOHLCV (ohlcv, market = undefined) {
          // {
          //   start: 1598345580000,
          //   open: '0.09771286',
          //   high: '0.09771286',
          //   low: '0.09771286',
          //   close: '0.09771286',
          //   volume: '1.45340410',
          //   sequence: 3853
          // }
          const timestamp = this.safeInteger (ohlcv, 'start');
          const open = this.safeFloat (ohlcv, 'open');
          const high = this.safeFloat (ohlcv, 'high');
          const low = this.safeFloat (ohlcv, 'low');
          const close = this.safeFloat (ohlcv, 'close');
          const volume = this.safeFloat (ohlcv, 'volume');
          return [ timestamp, open, high, low, close, volume ];
      }
  
      async fetchTrades (symbol, since = undefined, limit = undefined, params = {}) {
          await this.loadMarkets ();
          const market = this.market (symbol);
          const request = {
              'market': market['id'],
          };
          if (since !== undefined) {
              request['start'] = since;
          }
          if (limit !== undefined) {
              request['limit'] = limit;
          }
          // [
          //   {
          //     fillId: 'b5467d00-b13e-3fa9-8216-dd66735550fc',
          //     price: '0.09771286',
          //     quantity: '1.45340410',
          //     quoteQuantity: '0.14201627',
          //     time: 1598345638994,
          //     makerSide: 'buy',
          //     sequence: 3853
          //   }, ...
          // ]
          const response = await this.publicGetTrades (this.extend (request, params));
          return this.parseTrades (response, market, since, limit);
      }
  
      parseTrade (trade, market = undefined) {
          // public trades
          // {
          //   fillId: 'b5467d00-b13e-3fa9-8216-dd66735550fc',
          //   price: '0.09771286',
          //   quantity: '1.45340410',
          //   quoteQuantity: '0.14201627',
          //   time: 1598345638994,
          //   makerSide: 'buy',
          //   sequence: 3853
          // }
          // private trades
          // {
          //   fillId: '48582d10-b9bb-3c4b-94d3-e67537cf2472',
          //   price: '0.09905990',
          //   quantity: '0.40000000',
          //   quoteQuantity: '0.03962396',
          //   time: 1598873478762,
          //   makerSide: 'sell',
          //   sequence: 5053,
          //   market: 'DIL-ETH',
          //   orderId: '7cdc8e90-eb7d-11ea-9e60-4118569f6e63',
          //   side: 'buy',
          //   fee: '0.00080000',
          //   feeAsset: 'DIL',
          //   gas: '0.00857497',
          //   liquidity: 'taker',
          //   txId: '0xeaa02b112c0b8b61bc02fa1776a2b39d6c614e287c1af90df0a2e591da573e65',
          //   txStatus: 'mined'
          // }
          const id = this.safeString (trade, 'fillId');
          const price = this.safeFloat (trade, 'price');
          const amount = this.safeFloat (trade, 'quantity');
          const cost = this.safeFloat (trade, 'quoteQuantity');
          const timestamp = this.safeInteger (trade, 'time');
          const marketId = this.safeString (trade, 'market');
          const symbol = this.safeSymbol (marketId, market, '-');
          // this code handles the duality of public vs private trades
          const makerSide = this.safeString (trade, 'makerSide');
          const oppositeSide = (makerSide === 'buy') ? 'sell' : 'buy';
          const side = this.safeString (trade, 'side', oppositeSide);
          const takerOrMaker = this.safeString (trade, 'liquidity', 'taker');
          const feeCost = this.safeFloat (trade, 'fee');
          let fee = undefined;
          if (feeCost !== undefined) {
              const feeCurrencyId = this.safeString (trade, 'feeAsset');
              fee = {
                  'cost': feeCost,
                  'currency': this.safeCurrencyCode (feeCurrencyId),
              };
          }
          const orderId = this.safeString (trade, 'orderId');
          return {
              'info': trade,
              'timestamp': timestamp,
              'datetime': this.iso8601 (timestamp),
              'symbol': symbol,
              'id': id,
              'order': orderId,
              'type': 'limit',
              'side': side,
              'takerOrMaker': takerOrMaker,
              'price': price,
              'amount': amount,
              'cost': cost,
              'fee': fee,
          };
      }
  
      async fetchOrderBook (symbol, limit = undefined, params = {}) {
          await this.loadMarkets ();
          const market = this.market (symbol);
          const request = {
              'market': market['id'],
              'level': 2,
          };
          if (limit !== undefined) {
              request['limit'] = limit;
          }
          // {
          //   sequence: 36416753,
          //   bids: [
          //     [ '0.09672815', '8.22284267', 1 ],
          //     [ '0.09672814', '1.83685554', 1 ],
          //     [ '0.09672143', '4.10962617', 1 ],
          //     [ '0.09658884', '4.03863759', 1 ],
          //     [ '0.09653781', '3.35730684', 1 ],
          //     [ '0.09624660', '2.54163586', 1 ],
          //     [ '0.09617490', '1.93065030', 1 ]
          //   ],
          //   asks: [
          //     [ '0.09910476', '3.22840154', 1 ],
          //     [ '0.09940587', '3.39796593', 1 ],
          //     [ '0.09948189', '4.25088898', 1 ],
          //     [ '0.09958362', '2.42195784', 1 ],
          //     [ '0.09974393', '4.25234367', 1 ],
          //     [ '0.09995250', '3.40192141', 1 ]
          //   ]
          // }
          const response = await this.publicGetOrderbook (this.extend (request, params));
          const nonce = this.safeInteger (response, 'sequence');
          return {
              'timestamp': undefined,
              'datetime': undefined,
              'nonce': nonce,
              'bids': this.parseSide (response, 'bids'),
              'asks': this.parseSide (response, 'asks'),
          };
      }
  
      parseSide (book, side) {
          const bookSide = this.safeValue (book, side, []);
          const result = [];
          for (let i = 0; i < bookSide.length; i++) {
              const order = bookSide[i];
              const price = this.safeFloat (order, 0);
              const amount = this.safeFloat (order, 1);
              const orderCount = this.safeInteger (order, 2);
              result.push ([ price, amount, orderCount ]);
          }
          const descending = side === 'bids';
          return this.sortBy (result, 0, descending);
      }
  
      async fetchCurrencies (params = {}) {
          // [
          //   {
          //     name: 'Ether',
          //     symbol: 'ETH',
          //     contractAddress: '0x0000000000000000000000000000000000000000',
          //     assetDecimals: 18,
          //     exchangeDecimals: 8
          //   }, ..
          // ]
          const response = await this.publicGetAssets (params);
          const result = {};
          for (let i = 0; i < response.length; i++) {
              const entry = response[i];
              const name = this.safeString (entry, 'name');
              const currencyId = this.safeString (entry, 'symbol');
              const precision = this.safeInteger (entry, 'exchangeDecimals');
              const code = this.safeCurrencyCode (currencyId);
              const lot = Math.pow (-10, precision);
              result[code] = {
                  'id': currencyId,
                  'code': code,
                  'info': entry,
                  'type': undefined,
                  'name': name,
                  'active': undefined,
                  'fee': undefined,
                  'precision': precision,
                  'limits': {
                      'amount': { 'min': lot, 'max': undefined },
                      'price': { 'min': lot, 'max': undefined },
                      'cost': { 'min': undefined, 'max': undefined },
                      'withdraw': { 'min': lot, 'max': undefined },
                  },
              };
          }
          return result;
      }
  
      async fetchBalance (params = {}) {
          this.checkRequiredCredentials ();
          await this.loadMarkets ();
          const nonce1 = this.uuidv1 ();
          const request = {
              'nonce': nonce1,
              'wallet': this.walletAddress,
          };
          // [
          //   {
          //     asset: 'DIL',
          //     quantity: '0.00000000',
          //     availableForTrade: '0.00000000',
          //     locked: '0.00000000',
          //     usdValue: null
          //   }, ...
          // ]
          const extendedRequest = this.extend (request, params);
          if (extendedRequest['wallet'] === undefined) {
              throw new BadRequest (this.id + ' wallet is undefined, set this.walletAddress or "address" in params');
          }
          let response = undefined;
          try {
              response = await this.privateGetBalances (extendedRequest);
          } catch (e) {
              if (e instanceof InvalidAddress) {
                  const walletAddress = extendedRequest['wallet'];
                  await this.associateWallet (walletAddress);
                  response = await this.privateGetBalances (extendedRequest);
              } else {
                  throw e;
              }
          }
          const result = {
              'info': response,
          };
          for (let i = 0; i < response.length; i++) {
              const entry = response[i];
              const currencyId = this.safeString (entry, 'asset');
              const code = this.safeCurrencyCode (currencyId);
              const total = this.safeFloat (entry, 'quantity');
              const free = this.safeFloat (entry, 'availableForTrade');
              const used = this.safeFloat (entry, 'locked');
              result[code] = {
                  'free': free,
                  'used': used,
                  'total': total,
              };
          }
          return this.parseBalance (result);
      }
  
      async fetchMyTrades (symbol = undefined, since = undefined, limit = undefined, params = {}) {
          this.checkRequiredCredentials ();
          await this.loadMarkets ();
          let market = undefined;
          const request = {
              'nonce': this.uuidv1 (),
              'wallet': this.walletAddress,
          };
          if (symbol !== undefined) {
              market = this.market (symbol);
              request['market'] = market['id'];
          }
          if (since !== undefined) {
              request['start'] = since;
          }
          if (limit !== undefined) {
              request['limit'] = limit;
          }
          // [
          //   {
          //     fillId: '48582d10-b9bb-3c4b-94d3-e67537cf2472',
          //     price: '0.09905990',
          //     quantity: '0.40000000',
          //     quoteQuantity: '0.03962396',
          //     time: 1598873478762,
          //     makerSide: 'sell',
          //     sequence: 5053,
          //     market: 'DIL-ETH',
          //     orderId: '7cdc8e90-eb7d-11ea-9e60-4118569f6e63',
          //     side: 'buy',
          //     fee: '0.00080000',
          //     feeAsset: 'DIL',
          //     gas: '0.00857497',
          //     liquidity: 'taker',
          //     txId: '0xeaa02b112c0b8b61bc02fa1776a2b39d6c614e287c1af90df0a2e591da573e65',
          //     txStatus: 'mined'
          //   }
          // ]
          const extendedRequest = this.extend (request, params);
          if (extendedRequest['wallet'] === undefined) {
              throw new BadRequest (this.id + ' walletAddress is undefined, set this.walletAddress or "address" in params');
          }
          let response = undefined;
          try {
              response = await this.privateGetFills (extendedRequest);
          } catch (e) {
              if (e instanceof InvalidAddress) {
                  const walletAddress = extendedRequest['wallet'];
                  await this.associateWallet (walletAddress);
                  response = await this.privateGetFills (extendedRequest);
              } else {
                  throw e;
              }
          }
          return this.parseTrades (response, market, since, limit);
      }
  
      async fetchOrder (id, symbol = undefined, params = {}) {
          const request = {
              'orderId': id,
          };
          return await this.fetchOrdersHelper (symbol, undefined, undefined, this.extend (request, params));
      }
  
      async fetchOpenOrders (symbol = undefined, since = undefined, limit = undefined, params = {}) {
          const request = {
              'closed': false,
          };
          return await this.fetchOrdersHelper (symbol, since, limit, this.extend (request, params));
      }
  
      async fetchClosedOrders (symbol = undefined, since = undefined, limit = undefined, params = {}) {
          const request = {
              'closed': true,
          };
          return await this.fetchOrdersHelper (symbol, since, limit, this.extend (request, params));
      }
  
      async fetchOrdersHelper (symbol = undefined, since = undefined, limit = undefined, params = {}) {
          await this.loadMarkets ();
          const request = {
              'nonce': this.uuidv1 (),
              'wallet': this.walletAddress,
          };
          let market = undefined;
          if (symbol !== undefined) {
              market = this.market (symbol);
              request['market'] = market['id'];
          }
          if (since !== undefined) {
              request['start'] = since;
          }
          if (limit !== undefined) {
              request['limit'] = limit;
          }
          const response = await this.privateGetOrders (this.extend (request, params));
          // fetchClosedOrders / fetchOpenOrders
          // [
          //   {
          //     "market": "DIL-ETH",
          //     "orderId": "7cdc8e90-eb7d-11ea-9e60-4118569f6e63",
          //     "wallet": "0x0AB991497116f7F5532a4c2f4f7B1784488628e1",
          //     "time": 1598873478650,
          //     "status": "filled",
          //     "type": "limit",
          //     "side": "buy",
          //     "originalQuantity": "0.40000000",
          //     "executedQuantity": "0.40000000",
          //     "cumulativeQuoteQuantity": "0.03962396",
          //     "avgExecutionPrice": "0.09905990",
          //     "price": "1.00000000",
          //     "fills": [
          //       {
          //         "fillId": "48582d10-b9bb-3c4b-94d3-e67537cf2472",
          //         "price": "0.09905990",
          //         "quantity": "0.40000000",
          //         "quoteQuantity": "0.03962396",
          //         "time": 1598873478650,
          //         "makerSide": "sell",
          //         "sequence": 5053,
          //         "fee": "0.00080000",
          //         "feeAsset": "DIL",
          //         "gas": "0.00857497",
          //         "liquidity": "taker",
          //         "txId": "0xeaa02b112c0b8b61bc02fa1776a2b39d6c614e287c1af90df0a2e591da573e65",
          //         "txStatus": "mined"
          //       }
          //     ]
          //   }
          // ]
          // fetchOrder
          // { market: 'DIL-ETH',
          //   orderId: '7cdc8e90-eb7d-11ea-9e60-4118569f6e63',
          //   wallet: '0x0AB991497116f7F5532a4c2f4f7B1784488628e1',
          //   time: 1598873478650,
          //   status: 'filled',
          //   type: 'limit',
          //   side: 'buy',
          //   originalQuantity: '0.40000000',
          //   executedQuantity: '0.40000000',
          //   cumulativeQuoteQuantity: '0.03962396',
          //   avgExecutionPrice: '0.09905990',
          //   price: '1.00000000',
          //   fills:
          //    [ { fillId: '48582d10-b9bb-3c4b-94d3-e67537cf2472',
          //        price: '0.09905990',
          //        quantity: '0.40000000',
          //        quoteQuantity: '0.03962396',
          //        time: 1598873478650,
          //        makerSide: 'sell',
          //        sequence: 5053,
          //        fee: '0.00080000',
          //        feeAsset: 'DIL',
          //        gas: '0.00857497',
          //        liquidity: 'taker',
          //        txId: '0xeaa02b112c0b8b61bc02fa1776a2b39d6c614e287c1af90df0a2e591da573e65',
          //        txStatus: 'mined' } ] }
          if (Array.isArray (response)) {
              return this.parseOrders (response, market, since, limit);
          } else {
              return this.parseOrder (response, market);
          }
      }
  
      parseOrderStatus (status) {
          // https://docs.idex.io/#order-states-amp-lifecycle
          const statuses = {
              'active': 'open',
              'partiallyFilled': 'open',
              'rejected': 'canceled',
              'filled': 'closed',
          };
          return this.safeString (statuses, status, status);
      }
  
      parseOrder (order, market = undefined) {
          //
          //     {
          //         "market": "DIL-ETH",
          //         "orderId": "7cdc8e90-eb7d-11ea-9e60-4118569f6e63",
          //         "wallet": "0x0AB991497116f7F5532a4c2f4f7B1784488628e1",
          //         "time": 1598873478650,
          //         "status": "filled",
          //         "type": "limit",
          //         "side": "buy",
          //         "originalQuantity": "0.40000000",
          //         "executedQuantity": "0.40000000",
          //         "cumulativeQuoteQuantity": "0.03962396",
          //         "avgExecutionPrice": "0.09905990",
          //         "price": "1.00000000",
          //         "fills": [
          //             {
          //             "fillId": "48582d10-b9bb-3c4b-94d3-e67537cf2472",
          //             "price": "0.09905990",
          //             "quantity": "0.40000000",
          //             "quoteQuantity": "0.03962396",
          //             "time": 1598873478650,
          //             "makerSide": "sell",
          //             "sequence": 5053,
          //             "fee": "0.00080000",
          //             "feeAsset": "DIL",
          //             "gas": "0.00857497",
          //             "liquidity": "taker",
          //             "txId": "0xeaa02b112c0b8b61bc02fa1776a2b39d6c614e287c1af90df0a2e591da573e65",
          //             "txStatus": "mined"
          //             }
          //         ]
          //     }
          //
          const timestamp = this.safeInteger (order, 'time');
          const fills = this.safeValue (order, 'fills', []);
          const id = this.safeString (order, 'orderId');
          const clientOrderId = this.safeString (order, 'clientOrderId');
          const marketId = this.safeString (order, 'market');
          const side = this.safeString (order, 'side');
          const symbol = this.safeSymbol (marketId, market, '-');
          const trades = this.parseTrades (fills, market);
          const type = this.safeString (order, 'type');
          const amount = this.safeFloat (order, 'originalQuantity');
          const filled = this.safeFloat (order, 'executedQuantity');
          const average = this.safeFloat (order, 'avgExecutionPrice');
          const price = this.safeFloat (order, 'price');
          const rawStatus = this.safeString (order, 'status');
          const status = this.parseOrderStatus (rawStatus);
          const fee = {
              'currency': undefined,
              'cost': undefined,
          };
          let lastTrade = undefined;
          for (let i = 0; i < trades.length; i++) {
              lastTrade = trades[i];
              fee['currency'] = lastTrade['fee']['currency'];
              fee['cost'] = this.sum (fee['cost'], lastTrade['fee']['cost']);
          }
          const lastTradeTimestamp = this.safeInteger (lastTrade, 'timestamp');
          return this.safeOrder ({
              'info': order,
              'id': id,
              'clientOrderId': clientOrderId,
              'timestamp': timestamp,
              'datetime': this.iso8601 (timestamp),
              'lastTradeTimestamp': lastTradeTimestamp,
              'symbol': symbol,
              'type': type,
              'timeInForce': undefined,
              'postOnly': undefined,
              'side': side,
              'price': price,
              'stopPrice': undefined,
              'amount': amount,
              'cost': undefined,
              'average': average,
              'filled': filled,
              'remaining': undefined,
              'status': status,
              'fee': fee,
              'trades': trades,
          });
      }
  
      async associateWallet (walletAddress, params = {}) {
          const nonce = this.uuidv1 ();
          const noPrefix = this.remove0xPrefix (walletAddress);
          const byteArray = [
              this.base16ToBinary (nonce),
              this.base16ToBinary (noPrefix),
          ];
          const binary = this.binaryConcatArray (byteArray);
          const hash = this.hash (binary, 'keccak', 'hex');
          const signature = this.signMessageString (hash, this.privateKey);
          // {
          //   address: '0x0AB991497116f7F5532a4c2f4f7B1784488628e1',
          //   totalPortfolioValueUsd: '0.00',
          //   time: 1598468353626
          // }
          const request = {
              'parameters': {
                  'nonce': nonce,
                  'wallet': walletAddress,
              },
              'signature': signature,
          };
          const result = await this.privatePostWallets (request);
          return result;
      }
  
      async createOrder (symbol, type, side, amount, price = undefined, params = {}) {
          // https://docs.idex.io/#create-order
          this.checkRequiredCredentials ();
          await this.loadMarkets ();
          const market = this.market (symbol);
          const nonce = this.uuidv1 ();
          let typeEnum = undefined;
          const stopLossTypeEnums = {
              'stopLoss': 3,
              'stopLossLimit': 4,
              'takeProfit': 5,
              'takeProfitLimit': 6,
          };
          let stopPriceString = undefined;
          if ((type === 'stopLossLimit') || (type === 'takeProfitLimit') || ('stopPrice' in params)) {
              if (!('stopPrice' in params)) {
                  throw new BadRequest (this.id + ' stopPrice is a required parameter for ' + type + 'orders');
              }
              stopPriceString = this.priceToPrecision (symbol, params['stopPrice']);
          }
          const limitTypeEnums = {
              'limit': 1,
              'limitMaker': 2,
          };
          let priceString = undefined;
          const typeLower = type.toLowerCase ();
          const limitOrder = typeLower.indexOf ('limit') > -1;
          if (type in limitTypeEnums) {
              typeEnum = limitTypeEnums[type];
              priceString = this.priceToPrecision (symbol, price);
          } else if (type in stopLossTypeEnums) {
              typeEnum = stopLossTypeEnums[type];
              priceString = this.priceToPrecision (symbol, price);
          } else if (type === 'market') {
              typeEnum = 0;
          } else {
              throw new BadRequest (this.id + ' ' + type + ' is not a valid order type');
          }
          let amountEnum = 0; // base quantity
          if ('quoteOrderQuantity' in params) {
              if (type !== 'market') {
                  throw new NotSupported (this.id + ' quoteOrderQuantity is not supported for ' + type + ' orders, only supported for market orders');
              }
              amountEnum = 1;
              amount = this.safeFloat (params, 'quoteOrderQuantity');
          }
          const sideEnum = (side === 'buy') ? 0 : 1;
          const walletBytes = this.remove0xPrefix (this.walletAddress);
          const network = this.safeString (this.options, 'network', 'ETH');
          const orderVersion = (network === 'ETH') ? 1 : 2;
          const amountString = this.amountToPrecision (symbol, amount);
          // https://docs.idex.io/#time-in-force
          const timeInForceEnums = {
              'gtc': 0,
              'ioc': 2,
              'fok': 3,
          };
          const defaultTimeInForce = this.safeString (this.options, 'defaultTimeInForce', 'gtc');
          const timeInForce = this.safeString (params, 'timeInForce', defaultTimeInForce);
          let timeInForceEnum = undefined;
          if (timeInForce in timeInForceEnums) {
              timeInForceEnum = timeInForceEnums[timeInForce];
          } else {
              const allOptions = Object.keys (timeInForceEnums);
              const asString = allOptions.join (', ');
              throw new BadRequest (this.id + ' ' + timeInForce + ' is not a valid timeInForce, please choose one of ' + asString);
          }
          // https://docs.idex.io/#self-trade-prevention
          const selfTradePreventionEnums = {
              'dc': 0,
              'co': 1,
              'cn': 2,
              'cb': 3,
          };
          const defaultSelfTradePrevention = this.safeString (this.options, 'defaultSelfTradePrevention', 'cn');
          const selfTradePrevention = this.safeString (params, 'selfTradePrevention', defaultSelfTradePrevention);
          let selfTradePreventionEnum = undefined;
          if (selfTradePrevention in selfTradePreventionEnums) {
              selfTradePreventionEnum = selfTradePreventionEnums[selfTradePrevention];
          } else {
              const allOptions = Object.keys (selfTradePreventionEnums);
              const asString = allOptions.join (', ');
              throw new BadRequest (this.id + ' ' + selfTradePrevention + ' is not a valid selfTradePrevention, please choose one of ' + asString);
          }
          const byteArray = [
              this.numberToBE (orderVersion, 1),
              this.base16ToBinary (nonce),
              this.base16ToBinary (walletBytes),
              this.stringToBinary (this.encode (market['id'])),  // TODO: refactor to remove either encode or stringToBinary
              this.numberToBE (typeEnum, 1),
              this.numberToBE (sideEnum, 1),
              this.stringToBinary (this.encode (amountString)),
              this.numberToBE (amountEnum, 1),
          ];
          if (limitOrder) {
              const encodedPrice = this.stringToBinary (this.encode (priceString));
              byteArray.push (encodedPrice);
          }
          if (type in stopLossTypeEnums) {
              const encodedPrice = this.stringToBinary (this.encode (stopPriceString || priceString));
              byteArray.push (encodedPrice);
          }
          const clientOrderId = this.safeString (params, 'clientOrderId');
          if (clientOrderId !== undefined) {
              byteArray.push (this.stringToBinary (this.encode (clientOrderId)));
          }
          const after = [
              this.numberToBE (timeInForceEnum, 1),
              this.numberToBE (selfTradePreventionEnum, 1),
              this.numberToBE (0, 8), // unused
          ];
          const allBytes = this.arrayConcat (byteArray, after);
          const binary = this.binaryConcatArray (allBytes);
          const hash = this.hash (binary, 'keccak', 'hex');
          const signature = this.signMessageString (hash, this.privateKey);
          const request = {
              'parameters': {
                  'nonce': nonce,
                  'market': market['id'],
                  'side': side,
                  'type': type,
                  'wallet': this.walletAddress,
                  'timeInForce': timeInForce,
                  'selfTradePrevention': selfTradePrevention,
              },
              'signature': signature,
          };
          if (limitOrder) {
              request['parameters']['price'] = priceString;
          }
          if (type in stopLossTypeEnums) {
              request['parameters']['stopPrice'] = stopPriceString || priceString;
          }
          if (amountEnum === 0) {
              request['parameters']['quantity'] = amountString;
          } else {
              request['parameters']['quoteOrderQuantity'] = amountString;
          }
          if (clientOrderId !== undefined) {
              request['parameters']['clientOrderId'] = clientOrderId;
          }
          // {
          //   market: 'DIL-ETH',
          //   orderId: '7cdc8e90-eb7d-11ea-9e60-4118569f6e63',
          //   wallet: '0x0AB991497116f7F5532a4c2f4f7B1784488628e1',
          //   time: 1598873478650,
          //   status: 'filled',
          //   type: 'limit',
          //   side: 'buy',
          //   originalQuantity: '0.40000000',
          //   executedQuantity: '0.40000000',
          //   cumulativeQuoteQuantity: '0.03962396',
          //   price: '1.00000000',
          //   fills: [
          //     {
          //       fillId: '48582d10-b9bb-3c4b-94d3-e67537cf2472',
          //       price: '0.09905990',
          //       quantity: '0.40000000',
          //       quoteQuantity: '0.03962396',
          //       time: 1598873478650,
          //       makerSide: 'sell',
          //       sequence: 5053,
          //       fee: '0.00080000',
          //       feeAsset: 'DIL',
          //       gas: '0.00857497',
          //       liquidity: 'taker',
          //       txStatus: 'pending'
          //     }
          //   ],
          //   avgExecutionPrice: '0.09905990'
          // }
          // we don't use extend here because it is a signed endpoint
          const response = await this.privatePostOrders (request);
          return this.parseOrder (response, market);
      }
  
      async withdraw (code, amount, address, tag = undefined, params = {}) {
          this.checkRequiredCredentials ();
          await this.loadMarkets ();
          const nonce = this.uuidv1 ();
          const amountString = this.currencyToPrecision (code, amount);
          const currency = this.currency (code);
          const walletBytes = this.remove0xPrefix (this.walletAddress);
          const byteArray = [
              this.base16ToBinary (nonce),
              this.base16ToBinary (walletBytes),
              this.stringToBinary (this.encode (currency['id'])),
              this.stringToBinary (this.encode (amountString)),
              this.numberToBE (1, 1), // bool set to true
          ];
          const binary = this.binaryConcatArray (byteArray);
          const hash = this.hash (binary, 'keccak', 'hex');
          const signature = this.signMessageString (hash, this.privateKey);
          const request = {
              'parameters': {
                  'nonce': nonce,
                  'wallet': address,
                  'asset': currency['id'],
                  'quantity': amountString,
              },
              'signature': signature,
          };
          // {
          //   withdrawalId: 'a61dcff0-ec4d-11ea-8b83-c78a6ecb3180',
          //   asset: 'ETH',
          //   assetContractAddress: '0x0000000000000000000000000000000000000000',
          //   quantity: '0.20000000',
          //   time: 1598962883190,
          //   fee: '0.00024000',
          //   txStatus: 'pending',
          //   txId: null
          // }
          const response = await this.privatePostWithdrawals (request);
          const id = this.safeString (response, 'withdrawalId');
          return {
              'info': response,
              'id': id,
          };
      }
  
      async cancelOrder (id, symbol = undefined, params = {}) {
          this.checkRequiredCredentials ();
          await this.loadMarkets ();
          let market = undefined;
          if (symbol !== undefined) {
              market = this.market (symbol);
          }
          const nonce = this.uuidv1 ();
          const walletBytes = this.remove0xPrefix (this.walletAddress);
          const byteArray = [
              this.base16ToBinary (nonce),
              this.base16ToBinary (walletBytes),
              this.stringToBinary (this.encode (id)),
          ];
          const binary = this.binaryConcatArray (byteArray);
          const hash = this.hash (binary, 'keccak', 'hex');
          const signature = this.signMessageString (hash, this.privateKey);
          const request = {
              'parameters': {
                  'nonce': nonce,
                  'wallet': this.walletAddress,
                  'orderId': id,
              },
              'signature': signature,
          };
          // [ { orderId: '688336f0-ec50-11ea-9842-b332f8a34d0e' } ]
          const response = await this.privateDeleteOrders (this.extend (request, params));
          const canceledOrder = this.safeValue (response, 0);
          return this.parseOrder (canceledOrder, market);
      }
  
      handleErrors (code, reason, url, method, headers, body, response, requestHeaders, requestBody) {
          const errorCode = this.safeString (response, 'code');
          const message = this.safeString (response, 'message');
          if (errorCode in this.exceptions) {
              const Exception = this.exceptions[errorCode];
              throw new Exception (this.id + ' ' + message);
          }
          if (errorCode !== undefined) {
              throw new ExchangeError (this.id + ' ' + message);
          }
      }
  
      async fetchDeposits (code = undefined, since = undefined, limit = undefined, params = {}) {
          params = this.extend ({
              'method': 'privateGetDeposits',
          }, params);
          return this.fetchTransactionsHelper (code, since, limit, params);
      }
  
      async fetchWithdrawals (code = undefined, since = undefined, limit = undefined, params = {}) {
          params = this.extend ({
              'method': 'privateGetWithdrawals',
          }, params);
          return this.fetchTransactionsHelper (code, since, limit, params);
      }
  
      async fetchTransactionsHelper (code = undefined, since = undefined, limit = undefined, params = {}) {
          await this.loadMarkets ();
          const nonce = this.uuidv1 ();
          const request = {
              'nonce': nonce,
              'wallet': this.walletAddress,
          };
          let currency = undefined;
          if (code !== undefined) {
              currency = this.currency (code);
              request['asset'] = currency['id'];
          }
          if (since !== undefined) {
              request['start'] = since;
          }
          if (limit !== undefined) {
              request['limit'] = limit;
          }
          // [
          //   {
          //     depositId: 'e9970cc0-eb6b-11ea-9e89-09a5ebc1f98e',
          //     asset: 'ETH',
          //     quantity: '1.00000000',
          //     txId: '0xcd4aac3171d7131cc9e795568c67938675185ac17641553ef54c8a7c294c8142',
          //     txTime: 1598865853000,
          //     confirmationTime: 1598865930231
          //   }
          // ]
          const method = params['method'];
          params = this.omit (params, 'method');
          const response = await this[method] (this.extend (request, params));
          return this.parseTransactions (response, currency, since, limit);
      }
  
      parseTransactionStatus (status) {
          const statuses = {
              'mined': 'ok',
          };
          return this.safeString (statuses, status, status);
      }
  
      parseTransaction (transaction, currency = undefined) {
          // fetchDeposits
          // {
          //   depositId: 'e9970cc0-eb6b-11ea-9e89-09a5ebc1f98f',
          //   asset: 'ETH',
          //   quantity: '1.00000000',
          //   txId: '0xcd4aac3171d7131cc9e795568c67938675185ac17641553ef54c8a7c294c8142',
          //   txTime: 1598865853000,
          //   confirmationTime: 1598865930231
          // }
          // fetchWithdrwalas
          // {
          //   withdrawalId: 'a62d8760-ec4d-11ea-9fa6-47904c19499b',
          //   asset: 'ETH',
          //   assetContractAddress: '0x0000000000000000000000000000000000000000',
          //   quantity: '0.20000000',
          //   time: 1598962883288,
          //   fee: '0.00024000',
          //   txId: '0x305e9cdbaa85ad029f50578d13d31d777c085de573ed5334d95c19116d8c03ce',
          //   txStatus: 'mined'
          //  }
          let type = undefined;
          if ('depositId' in transaction) {
              type = 'deposit';
          } else if ('withdrawalId' in transaction) {
              type = 'withdrawal';
          }
          const id = this.safeString2 (transaction, 'depositId', 'withdrawId');
          const code = this.safeCurrencyCode (this.safeString (transaction, 'asset'), currency);
          const amount = this.safeFloat (transaction, 'quantity');
          const txid = this.safeString (transaction, 'txId');
          const timestamp = this.safeInteger (transaction, 'txTime');
          let fee = undefined;
          if ('fee' in transaction) {
              fee = {
                  'cost': this.safeFloat (transaction, 'fee'),
                  'currency': 'ETH',
              };
          }
          const rawStatus = this.safeString (transaction, 'txStatus');
          const status = this.parseTransactionStatus (rawStatus);
          const updated = this.safeInteger (transaction, 'confirmationTime');
          return {
              'info': transaction,
              'id': id,
              'txid': txid,
              'timestamp': timestamp,
              'datetime': this.iso8601 (timestamp),
              'address': undefined,
              'tag': undefined,
              'type': type,
              'amount': amount,
              'currency': code,
              'status': status,
              'updated': updated,
              'fee': fee,
          };
      }
  
      sign (path, api = 'public', method = 'GET', params = {}, headers = undefined, body = undefined) {
          const network = this.safeString (this.options, 'network', 'ETH');
          const version = this.safeString (this.options, 'version', 'v1');
          let url = this.urls['api'][network] + '/' + version + '/' + path;
          const keys = Object.keys (params);
          const length = keys.length;
          let query = undefined;
          if (length > 0) {
              if (method === 'GET') {
                  query = this.urlencode (params);
                  url = url + '?' + query;
              } else {
                  body = this.json (params);
              }
          }
          headers = {
              'Content-Type': 'application/json',
          };
          if (this.apiKey !== undefined) {
              headers['IDEX-API-Key'] = this.apiKey;
          }
          if (api === 'private') {
              let payload = undefined;
              if (method === 'GET') {
                  payload = query;
              } else {
                  payload = body;
              }
              headers['IDEX-HMAC-Signature'] = this.hmac (this.encode (payload), this.encode (this.secret), 'sha256', 'hex');
          }
          return { 'url': url, 'method': method, 'body': body, 'headers': headers };
      }
  };
  