text: 'use strict';
  
  //  ---------------------------------------------------------------------------
  
  const Exchange = require ('./base/Exchange');
  
  //  ---------------------------------------------------------------------------
  
  module.exports = class btcchina extends Exchange {
      describe () {
          return this.deepExtend (super.describe (), {
              id: 'btcchina',
              name: 'BTCChina',
              countries: ['CN'],
              rateLimit: 1500,
              version: 'v1',
              has: {
                  CORS: true,
              },
              urls: {
                  logo: 'https://user-images.githubusercontent.com/1294454/27766368-465b3286-5ed6-11e7-9a11-0f6467e1d82b.jpg',
                  api: {
                      plus: 'https://plus-api.btcchina.com/market',
                      public: 'https://data.btcchina.com/data',
                      private: 'https://api.btcchina.com/api_trade_v1.php',
                  },
                  www: 'https://www.btcchina.com',
                  doc: 'https://www.btcchina.com/apidocs',
              },
              api: {
                  plus: {
                      get: [
                          'orderbook',
                          'ticker',
                          'trade',
                     ],
                  },
                  public: {
                      get: [
                          'historydata',
                          'orderbook',
                          'ticker',
                          'trades',
                     ],
                  },
                  private: {
                      post: [
                          'BuyIcebergOrder',
                          'BuyOrder',
                          'BuyOrder2',
                          'BuyStopOrder',
                          'CancelIcebergOrder',
                          'CancelOrder',
                          'CancelStopOrder',
                          'GetAccountInfo',
                          'getArchivedOrder',
                          'getArchivedOrders',
                          'GetDeposits',
                          'GetIcebergOrder',
                          'GetIcebergOrders',
                          'GetMarketDepth',
                          'GetMarketDepth2',
                          'GetOrder',
                          'GetOrders',
                          'GetStopOrder',
                          'GetStopOrders',
                          'GetTransactions',
                          'GetWithdrawal',
                          'GetWithdrawals',
                          'RequestWithdrawal',
                          'SellIcebergOrder',
                          'SellOrder',
                          'SellOrder2',
                          'SellStopOrder',
                     ],
                  },
              },
              markets: {
                  'BTC/CNY': { id: 'btccny', symbol: 'BTC/CNY', base: 'BTC', quote: 'CNY', api: 'public', plus: false },
                  'LTC/CNY': { id: 'ltccny', symbol: 'LTC/CNY', base: 'LTC', quote: 'CNY', api: 'public', plus: false },
                  'LTC/BTC': { id: 'ltcbtc', symbol: 'LTC/BTC', base: 'LTC', quote: 'BTC', api: 'public', plus: false },
                  'BCH/CNY': { id: 'bcccny', symbol: 'BCH/CNY', base: 'BCH', quote: 'CNY', api: 'plus', plus: true },
                  'ETH/CNY': { id: 'ethcny', symbol: 'ETH/CNY', base: 'ETH', quote: 'CNY', api: 'plus', plus: true },
              },
          });
      }
  
      async fetchMarkets () {
          let markets = await this.publicGetTicker ({
              market: 'all',
          });
          let result = [];
          let keys = Object.keys (markets);
          for (let p = 0; p < keys.length; p++) {
              let key = keys[p];
              let market = markets[key];
              let parts = key.split ('_');
              let id = parts[1];
              let base = id.slice (0, 3);
              let quote = id.slice (3, 6);
              base = base.toUpperCase ();
              quote = quote.toUpperCase ();
              let symbol = base + '/' + quote;
              result.push ({
                  id,
                  symbol,
                  base,
                  quote,
                  info: market,
              });
          }
          return result;
      }
  
      async fetchBalance (params = {}) {
          await this.loadMarkets ();
          let response = await this.privatePostGetAccountInfo ();
          let balances = response['result'];
          let result = { info: balances };
          let currencies = Object.keys (this.currencies);
          for (let i = 0; i < currencies.length; i++) {
              let currency = currencies[i];
              let lowercase = currency.toLowerCase ();
              let account = this.account ();
              if (lowercase in balances['balance'])
                  account['total'] = parseFloat (balances['balance'][lowercase]['amount']);
              if (lowercase in balances['frozen'])
                  account['used'] = parseFloat (balances['frozen'][lowercase]['amount']);
              account['free'] = account['total'] - account['used'];
              result[currency] = account;
          }
          return this.parseBalance (result);
      }
  
      createMarketRequest (market) {
          let request = {};
          let field = (market['plus']) ? 'symbol' : 'market';
          request[field] = market['id'];
          return request;
      }
  
      async fetchOrderBook (symbol, limit = undefined, params = {}) {
          await this.loadMarkets ();
          let market = this.market (symbol);
          let method = market['api'] + 'GetOrderbook';
          let request = this.createMarketRequest (market);
          let orderbook = await this[method] (this.extend (request, params));
          let timestamp = orderbook['date'] * 1000;
          return this.parseOrderBook (orderbook, timestamp);
      }
  
      parseTicker (ticker, market) {
          let timestamp = ticker['date'] * 1000;
          let last = this.safeFloat (ticker, 'last');
          return {
              timestamp,
              datetime: this.iso8601 (timestamp),
              high: this.safeFloat (ticker, 'high'),
              low: this.safeFloat (ticker, 'low'),
              bid: this.safeFloat (ticker, 'buy'),
              ask: this.safeFloat (ticker, 'sell'),
              vwap: this.safeFloat (ticker, 'vwap'),
              open: this.safeFloat (ticker, 'open'),
              close: last,
              last,
              previousClose: undefined,
              change: undefined,
              percentage: undefined,
              average: undefined,
              baseVolume: this.safeFloat (ticker, 'vol'),
              quoteVolume: undefined,
              info: ticker,
          };
      }
  
      parseTickerPlus (ticker, market) {
          let timestamp = ticker['Timestamp'];
          let symbol = undefined;
          if (market)
              symbol = market['symbol'];
          return {
              symbol,
              timestamp,
              datetime: this.iso8601 (timestamp),
              high: this.safeFloat (ticker, 'High'),
              low: this.safeFloat (ticker, 'Low'),
              bid: this.safeFloat (ticker, 'BidPrice'),
              ask: this.safeFloat (ticker, 'AskPrice'),
              vwap: undefined,
              open: this.safeFloat (ticker, 'Open'),
              last: this.safeFloat (ticker, 'Last'),
              change: undefined,
              percentage: undefined,
              average: undefined,
              baseVolume: this.safeFloat (ticker, 'Volume24H'),
              quoteVolume: undefined,
              info: ticker,
          };
      }
  
      async fetchTicker (symbol, params = {}) {
          await this.loadMarkets ();
          let market = this.market (symbol);
          let method = market['api'] + 'GetTicker';
          let request = this.createMarketRequest (market);
          let tickers = await this[method] (this.extend (request, params));
          let ticker = tickers['ticker'];
          if (market['plus'])
              return this.parseTickerPlus (ticker, market);
          return this.parseTicker (ticker, market);
      }
  
      parseTrade (trade, market) {
          let timestamp = parseInt (trade['date']) * 1000;
          return {
              id: trade['tid'],
              info: trade,
              timestamp,
              datetime: this.iso8601 (timestamp),
              symbol: market['symbol'],
              type: undefined,
              side: undefined,
              price: trade['price'],
              amount: trade['amount'],
          };
      }
  
      parseTradePlus (trade, market) {
          let timestamp = this.parse8601 (trade['timestamp']);
          return {
              id: undefined,
              info: trade,
              timestamp,
              datetime: this.iso8601 (timestamp),
              symbol: market['symbol'],
              type: undefined,
              side: trade['side'].toLowerCase (),
              price: trade['price'],
              amount: trade['size'],
          };
      }
  
      parseTradesPlus (trades, market = undefined) {
          let result = [];
          for (let i = 0; i < trades.length; i++) {
              result.push (this.parseTradePlus (trades[i], market));
          }
          return result;
      }
  
      async fetchTrades (symbol, since = undefined, limit = undefined, params = {}) {
          await this.loadMarkets ();
          let market = this.market (symbol);
          let method = market['api'] + 'GetTrade';
          let request = this.createMarketRequest (market);
          if (market['plus']) {
              let now = this.milliseconds ();
              request['start_time'] = now - 86400 * 1000;
              request['end_time'] = now;
          } else {
              method += 's'; // trades vs trade
          }
          let response = await this[method] (this.extend (request, params));
          if (market['plus']) {
              return this.parseTradesPlus (response['trades'], market);
          }
          return this.parseTrades (response, market, since, limit);
      }
  
      async createOrder (symbol, type, side, amount, price = undefined, params = {}) {
          await this.loadMarkets ();
          let market = this.market (symbol);
          let method = 'privatePost' + this.capitalize (side) + 'Order2';
          let order = {};
          let id = market['id'].toUpperCase ();
          if (type === 'market') {
              order['params'] = [undefined, amount, id];
          } else {
              order['params'] = [price, amount, id];
          }
          let response = await this[method] (this.extend (order, params));
          return {
              info: response,
              id: response['id'],
          };
      }
  
      async cancelOrder (id, symbol = undefined, params = {}) {
          await this.loadMarkets ();
          let market = params['market']; // TODO fixme
          return await this.privatePostCancelOrder (this.extend ({
              params: [id, market],
          }, params));
      }
  
      nonce () {
          return this.microseconds ();
      }
  
      sign (path, api = 'public', method = 'GET', params = {}, headers = undefined, body = undefined) {
          let url = this.urls['api'][api] + '/' + path;
          if (api === 'private') {
              this.checkRequiredCredentials ();
              let p = [];
              if ('params' in params)
                  p = params['params'];
              let nonce = this.nonce ();
              let request = {
                  method: path,
                  id: nonce,
                  params: p,
              };
              p = p.join (',');
              body = this.json (request);
              let query = (
                  'tonce=' + nonce +
                  '&accesskey=' + this.apiKey +
                  '&requestmethod=' + method.toLowerCase () +
                  '&id=' + nonce +
                  '&method=' + path +
                  '&params=' + p
              );
              let signature = this.hmac (this.encode (query), this.encode (this.secret), 'sha1');
              let auth = this.encode (this.apiKey + ':' + signature);
              headers = {
                  Authorization: 'Basic ' + this.stringToBase64 (auth),
                  'Json-Rpc-Tonce': nonce,
              };
          } else {
              if (Object.keys (params).length)
                  url += '?' + this.urlencode (params);
          }
          return { url, method, body, headers: headers };
      }
  };
  