# -*- coding: utf-8 -*-

# PLEASE DO NOT EDIT THIS FILE, IT IS GENERATED AND WILL BE OVERWRITTEN:
# https://github.com/ccxt/ccxt/blob/master/CONTRIBUTING.md#how-to-contribute-code

from ccxt.async_support.base.exchange import Exchange

# -----------------------------------------------------------------------------

try:
    basestring  # Python 3
except NameError:
    basestring = str  # Python 2
import json
from ccxt.base.errors import ExchangeError
from ccxt.base.errors import AuthenticationError
from ccxt.base.errors import ArgumentsRequired
from ccxt.base.errors import NullResponse
from ccxt.base.errors import InsufficientFunds
from ccxt.base.errors import InvalidOrder
from ccxt.base.errors import OrderNotFound
from ccxt.base.errors import NotSupported
from ccxt.base.errors import DDoSProtection
from ccxt.base.errors import RateLimitExceeded
from ccxt.base.errors import InvalidNonce


class cex(Exchange):

    def describe(self):
        return self.deep_extend(super(cex, self).describe(), {
            'id': 'cex',
            'name': 'CEX.IO',
            'countries': ['GB', 'EU', 'CY', 'RU'],
            'rateLimit': 1500,
            'has': {
                'cancelOrder': True,
                'CORS': False,
                'createOrder': True,
                'editOrder': True,
                'fetchBalance': True,
                'fetchClosedOrders': True,
                'fetchCurrencies': True,
                'fetchDepositAddress': True,
                'fetchMarkets': True,
                'fetchOHLCV': True,
                'fetchOpenOrders': True,
                'fetchOrder': True,
                'fetchOrderBook': True,
                'fetchOrders': True,
                'fetchTicker': True,
                'fetchTickers': True,
                'fetchTrades': True,
            },
            'timeframes': {
                '1m': '1m',
            },
            'urls': {
                'logo': 'https://user-images.githubusercontent.com/1294454/27766442-8ddc33b0-5ed8-11e7-8b98-f786aef0f3c9.jpg',
                'api': 'https://cex.io/api',
                'www': 'https://cex.io',
                'doc': 'https://cex.io/cex-api',
                'fees': [
                    'https://cex.io/fee-schedule',
                    'https://cex.io/limits-commissions',
                ],
                'referral': 'https://cex.io/r/0/up105393824/0/',
            },
            'requiredCredentials': {
                'apiKey': True,
                'secret': True,
                'uid': True,
            },
            'api': {
                'public': {
                    'get': [
                        'currency_profile',
                        'currency_limits/',
                        'last_price/{pair}/',
                        'last_prices/{currencies}/',
                        'ohlcv/hd/{yyyymmdd}/{pair}',
                        'order_book/{pair}/',
                        'ticker/{pair}/',
                        'tickers/{currencies}/',
                        'trade_history/{pair}/',
                    ],
                    'post': [
                        'convert/{pair}',
                        'price_stats/{pair}',
                    ],
                },
                'private': {
                    'post': [
                        'active_orders_status/',
                        'archived_orders/{pair}/',
                        'balance/',
                        'cancel_order/',
                        'cancel_orders/{pair}/',
                        'cancel_replace_order/{pair}/',
                        'close_position/{pair}/',
                        'get_address/',
                        'get_myfee/',
                        'get_order/',
                        'get_order_tx/',
                        'open_orders/{pair}/',
                        'open_orders/',
                        'open_position/{pair}/',
                        'open_positions/{pair}/',
                        'place_order/{pair}/',
                    ],
                },
            },
            'fees': {
                'trading': {
                    'maker': 0.16 / 100,
                    'taker': 0.25 / 100,
                },
                'funding': {
                    'withdraw': {
                        # 'USD': None,
                        # 'EUR': None,
                        # 'RUB': None,
                        # 'GBP': None,
                        'BTC': 0.001,
                        'ETH': 0.01,
                        'BCH': 0.001,
                        'DASH': 0.01,
                        'BTG': 0.001,
                        'ZEC': 0.001,
                        'XRP': 0.02,
                    },
                    'deposit': {
                        # 'USD': amount => amount * 0.035 + 0.25,
                        # 'EUR': amount => amount * 0.035 + 0.24,
                        # 'RUB': amount => amount * 0.05 + 15.57,
                        # 'GBP': amount => amount * 0.035 + 0.2,
                        'BTC': 0.0,
                        'ETH': 0.0,
                        'BCH': 0.0,
                        'DASH': 0.0,
                        'BTG': 0.0,
                        'ZEC': 0.0,
                        'XRP': 0.0,
                        'XLM': 0.0,
                    },
                },
            },
            'exceptions': {
                'exact': {},
                'broad': {
                    'Insufficient funds': InsufficientFunds,
                    'Nonce must be incremented': InvalidNonce,
                    'Invalid Order': InvalidOrder,
                    'Order not found': OrderNotFound,
                    'limit exceeded': RateLimitExceeded,  # {"error":"rate limit exceeded"}
                    'Invalid API key': AuthenticationError,
                    'There was an error while placing your order': InvalidOrder,
                    'Sorry, too many clients already': DDoSProtection,
                },
            },
            'options': {
                'fetchOHLCVWarning': True,
                'createMarketBuyOrderRequiresPrice': True,
                'order': {
                    'status': {
                        'c': 'canceled',
                        'd': 'closed',
                        'cd': 'canceled',
                        'a': 'open',
                    },
                },
            },
        })

    async def fetch_currencies_from_cache(self, params={}):
        # self method is now redundant
        # currencies are now fetched before markets
        options = self.safe_value(self.options, 'fetchCurrencies', {})
        timestamp = self.safe_integer(options, 'timestamp')
        expires = self.safe_integer(options, 'expires', 1000)
        now = self.milliseconds()
        if (timestamp is None) or ((now - timestamp) > expires):
            response = await self.publicGetCurrencyProfile(params)
            self.options['fetchCurrencies'] = self.extend(options, {
                'response': response,
                'timestamp': now,
            })
        return self.safe_value(self.options['fetchCurrencies'], 'response')

    async def fetch_currencies(self, params={}):
        response = await self.fetch_currencies_from_cache(params)
        self.options['currencies'] = {
            'timestamp': self.milliseconds(),
            'response': response,
        }
        #
        #     {
        #         "e":"currency_profile",
        #         "ok":"ok",
        #         "data":{
        #             "symbols":[
        #                 {
        #                     "code":"GHS",
        #                     "contract":true,
        #                     "commodity":true,
        #                     "fiat":false,
        #                     "description":"CEX.IO doesn't provide cloud mining services anymore.",
        #                     "precision":8,
        #                     "scale":0,
        #                     "minimumCurrencyAmount":"0.00000001",
        #                     "minimalWithdrawalAmount":-1
        #                 },
        #                 {
        #                     "code":"BTC",
        #                     "contract":false,
        #                     "commodity":false,
        #                     "fiat":false,
        #                     "description":"",
        #                     "precision":8,
        #                     "scale":0,
        #                     "minimumCurrencyAmount":"0.00000001",
        #                     "minimalWithdrawalAmount":0.002
        #                 },
        #                 {
        #                     "code":"ETH",
        #                     "contract":false,
        #                     "commodity":false,
        #                     "fiat":false,
        #                     "description":"",
        #                     "precision":8,
        #                     "scale":2,
        #                     "minimumCurrencyAmount":"0.00000100",
        #                     "minimalWithdrawalAmount":0.01
        #                 }
        #             ],
        #             "pairs":[
        #                 {
        #                     "symbol1":"BTC",
        #                     "symbol2":"USD",
        #                     "pricePrecision":1,
        #                     "priceScale":"/1000000",
        #                     "minLotSize":0.002,
        #                     "minLotSizeS2":20
        #                 },
        #                 {
        #                     "symbol1":"ETH",
        #                     "symbol2":"USD",
        #                     "pricePrecision":2,
        #                     "priceScale":"/10000",
        #                     "minLotSize":0.1,
        #                     "minLotSizeS2":20
        #                 }
        #             ]
        #         }
        #     }
        #
        data = self.safe_value(response, 'data', [])
        currencies = self.safe_value(data, 'symbols', [])
        result = {}
        for i in range(0, len(currencies)):
            currency = currencies[i]
            id = self.safe_string(currency, 'code')
            code = self.safe_currency_code(id)
            precision = self.safe_integer(currency, 'precision')
            active = True
            result[code] = {
                'id': id,
                'code': code,
                'name': id,
                'active': active,
                'precision': precision,
                'fee': None,
                'limits': {
                    'amount': {
                        'min': self.safe_float(currency, 'minimumCurrencyAmount'),
                        'max': None,
                    },
                    'price': {
                        'min': None,
                        'max': None,
                    },
                    'cost': {
                        'min': None,
                        'max': None,
                    },
                    'withdraw': {
                        'min': self.safe_float(currency, 'minimalWithdrawalAmount'),
                        'max': None,
                    },
                },
                'info': currency,
            }
        return result

    async def fetch_markets(self, params={}):
        currenciesResponse = await self.fetch_currencies_from_cache(params)
        currenciesData = self.safe_value(currenciesResponse, 'data', {})
        currencies = self.safe_value(currenciesData, 'symbols', [])
        currenciesById = self.index_by(currencies, 'code')
        pairs = self.safe_value(currenciesData, 'pairs', [])
        response = await self.publicGetCurrencyLimits(params)
        #
        #     {
        #         "e":"currency_limits",
        #         "ok":"ok",
        #         "data": {
        #             "pairs":[
        #                 {
        #                     "symbol1":"BTC",
        #                     "symbol2":"USD",
        #                     "minLotSize":0.002,
        #                     "minLotSizeS2":20,
        #                     "maxLotSize":30,
        #                     "minPrice":"1500",
        #                     "maxPrice":"35000"
        #                 },
        #                 {
        #                     "symbol1":"BCH",
        #                     "symbol2":"EUR",
        #                     "minLotSize":0.1,
        #                     "minLotSizeS2":20,
        #                     "maxLotSize":null,
        #                     "minPrice":"25",
        #                     "maxPrice":"8192"
        #                 }
        #             ]
        #         }
        #     }
        #
        result = []
        markets = self.safe_value(response['data'], 'pairs')
        for i in range(0, len(markets)):
            market = markets[i]
            baseId = self.safe_string(market, 'symbol1')
            quoteId = self.safe_string(market, 'symbol2')
            id = baseId + '/' + quoteId
            base = self.safe_currency_code(baseId)
            quote = self.safe_currency_code(quoteId)
            symbol = base + '/' + quote
            baseCurrency = self.safe_value(currenciesById, baseId, {})
            quoteCurrency = self.safe_value(currenciesById, quoteId, {})
            pricePrecision = self.safe_integer(quoteCurrency, 'precision', 8)
            for j in range(0, len(pairs)):
                pair = pairs[j]
                if (pair['symbol1'] == baseId) and (pair['symbol2'] == quoteId):
                    # we might need to account for `priceScale` here
                    pricePrecision = self.safe_integer(pair, 'pricePrecision', pricePrecision)
            baseCcyPrecision = self.safe_integer(baseCurrency, 'precision', 8)
            baseCcyScale = self.safe_integer(baseCurrency, 'scale', 0)
            amountPrecision = baseCcyPrecision - baseCcyScale
            precision = {
                'amount': amountPrecision,
                'price': pricePrecision,
            }
            result.append({
                'id': id,
                'info': market,
                'symbol': symbol,
                'base': base,
                'quote': quote,
                'baseId': baseId,
                'quoteId': quoteId,
                'precision': precision,
                'limits': {
                    'amount': {
                        'min': self.safe_float(market, 'minLotSize'),
                        'max': self.safe_float(market, 'maxLotSize'),
                    },
                    'price': {
                        'min': self.safe_float(market, 'minPrice'),
                        'max': self.safe_float(market, 'maxPrice'),
                    },
                    'cost': {
                        'min': self.safe_float(market, 'minLotSizeS2'),
                        'max': None,
                    },
                },
                'active': None,
            })
        return result

    async def fetch_balance(self, params={}):
        await self.load_markets()
        response = await self.privatePostBalance(params)
        result = {'info': response}
        ommited = ['username', 'timestamp']
        balances = self.omit(response, ommited)
        currencyIds = list(balances.keys())
        for i in range(0, len(currencyIds)):
            currencyId = currencyIds[i]
            balance = self.safe_value(balances, currencyId, {})
            account = self.account()
            account['free'] = self.safe_float(balance, 'available')
            # https://github.com/ccxt/ccxt/issues/5484
            account['used'] = self.safe_float(balance, 'orders', 0.0)
            code = self.safe_currency_code(currencyId)
            result[code] = account
        return self.parse_balance(result)

    async def fetch_order_book(self, symbol, limit=None, params={}):
        await self.load_markets()
        request = {
            'pair': self.market_id(symbol),
        }
        if limit is not None:
            request['depth'] = limit
        response = await self.publicGetOrderBookPair(self.extend(request, params))
        timestamp = self.safe_timestamp(response, 'timestamp')
        return self.parse_order_book(response, timestamp)

    def parse_ohlcv(self, ohlcv, market=None):
        #
        #     [
        #         1591403940,
        #         0.024972,
        #         0.024972,
        #         0.024969,
        #         0.024969,
        #         0.49999900
        #     ]
        #
        return [
            self.safe_timestamp(ohlcv, 0),
            self.safe_float(ohlcv, 1),
            self.safe_float(ohlcv, 2),
            self.safe_float(ohlcv, 3),
            self.safe_float(ohlcv, 4),
            self.safe_float(ohlcv, 5),
        ]

    async def fetch_ohlcv(self, symbol, timeframe='1m', since=None, limit=None, params={}):
        await self.load_markets()
        market = self.market(symbol)
        if since is None:
            since = self.milliseconds() - 86400000  # yesterday
        else:
            if self.options['fetchOHLCVWarning']:
                raise ExchangeError(self.id + " fetchOHLCV warning: CEX can return historical candles for a certain date only, self might produce an empty or None reply. Set exchange.options['fetchOHLCVWarning'] = False or add({'options': {'fetchOHLCVWarning': False}}) to constructor params to suppress self warning message.")
        ymd = self.ymd(since)
        ymd = ymd.split('-')
        ymd = ''.join(ymd)
        request = {
            'pair': market['id'],
            'yyyymmdd': ymd,
        }
        try:
            response = await self.publicGetOhlcvHdYyyymmddPair(self.extend(request, params))
            #
            #     {
            #         "time":20200606,
            #         "data1m":"[[1591403940,0.024972,0.024972,0.024969,0.024969,0.49999900]]",
            #     }
            #
            key = 'data' + self.timeframes[timeframe]
            data = self.safe_string(response, key)
            ohlcvs = json.loads(data)
            return self.parse_ohlcvs(ohlcvs, market, timeframe, since, limit)
        except Exception as e:
            if isinstance(e, NullResponse):
                return []

    def parse_ticker(self, ticker, market=None):
        timestamp = self.safe_timestamp(ticker, 'timestamp')
        volume = self.safe_float(ticker, 'volume')
        high = self.safe_float(ticker, 'high')
        low = self.safe_float(ticker, 'low')
        bid = self.safe_float(ticker, 'bid')
        ask = self.safe_float(ticker, 'ask')
        last = self.safe_float(ticker, 'last')
        symbol = None
        if market:
            symbol = market['symbol']
        return {
            'symbol': symbol,
            'timestamp': timestamp,
            'datetime': self.iso8601(timestamp),
            'high': high,
            'low': low,
            'bid': bid,
            'bidVolume': None,
            'ask': ask,
            'askVolume': None,
            'vwap': None,
            'open': None,
            'close': last,
            'last': last,
            'previousClose': None,
            'change': None,
            'percentage': None,
            'average': None,
            'baseVolume': volume,
            'quoteVolume': None,
            'info': ticker,
        }

    async def fetch_tickers(self, symbols=None, params={}):
        await self.load_markets()
        currencies = list(self.currencies.keys())
        request = {
            'currencies': '/'.join(currencies),
        }
        response = await self.publicGetTickersCurrencies(self.extend(request, params))
        tickers = response['data']
        result = {}
        for t in range(0, len(tickers)):
            ticker = tickers[t]
            symbol = ticker['pair'].replace(':', '/')
            market = self.markets[symbol]
            result[symbol] = self.parse_ticker(ticker, market)
        return self.filter_by_array(result, 'symbol', symbols)

    async def fetch_ticker(self, symbol, params={}):
        await self.load_markets()
        market = self.market(symbol)
        request = {
            'pair': market['id'],
        }
        ticker = await self.publicGetTickerPair(self.extend(request, params))
        return self.parse_ticker(ticker, market)

    def parse_trade(self, trade, market=None):
        timestamp = self.safe_timestamp(trade, 'date')
        id = self.safe_string(trade, 'tid')
        type = None
        side = self.safe_string(trade, 'type')
        price = self.safe_float(trade, 'price')
        amount = self.safe_float(trade, 'amount')
        cost = None
        if amount is not None:
            if price is not None:
                cost = amount * price
        symbol = None
        if market is not None:
            symbol = market['symbol']
        return {
            'info': trade,
            'id': id,
            'timestamp': timestamp,
            'datetime': self.iso8601(timestamp),
            'symbol': symbol,
            'type': type,
            'side': side,
            'order': None,
            'takerOrMaker': None,
            'price': price,
            'amount': amount,
            'cost': cost,
            'fee': None,
        }

    async def fetch_trades(self, symbol, since=None, limit=None, params={}):
        await self.load_markets()
        market = self.market(symbol)
        request = {
            'pair': market['id'],
        }
        response = await self.publicGetTradeHistoryPair(self.extend(request, params))
        return self.parse_trades(response, market, since, limit)

    async def create_order(self, symbol, type, side, amount, price=None, params={}):
        # for market buy it requires the amount of quote currency to spend
        if (type == 'market') and (side == 'buy'):
            if self.options['createMarketBuyOrderRequiresPrice']:
                if price is None:
                    raise InvalidOrder(self.id + " createOrder() requires the price argument with market buy orders to calculate total order cost(amount to spend), where cost = amount * price. Supply a price argument to createOrder() call if you want the cost to be calculated for you from price and amount, or, alternatively, add .options['createMarketBuyOrderRequiresPrice'] = False to supply the cost in the amount argument(the exchange-specific behaviour)")
                else:
                    amount = amount * price
        await self.load_markets()
        request = {
            'pair': self.market_id(symbol),
            'type': side,
            'amount': amount,
        }
        if type == 'limit':
            request['price'] = price
        else:
            request['order_type'] = type
        response = await self.privatePostPlaceOrderPair(self.extend(request, params))
        #
        #     {
        #         "id": "12978363524",
        #         "time": 1586610022259,
        #         "type": "buy",
        #         "price": "0.033934",
        #         "amount": "0.10722802",
        #         "pending": "0.10722802",
        #         "complete": False
        #     }
        #
        placedAmount = self.safe_float(response, 'amount')
        remaining = self.safe_float(response, 'pending')
        timestamp = self.safe_value(response, 'time')
        complete = self.safe_value(response, 'complete')
        status = 'closed' if complete else 'open'
        filled = None
        if (placedAmount is not None) and (remaining is not None):
            filled = max(placedAmount - remaining, 0)
        return {
            'id': self.safe_string(response, 'id'),
            'info': response,
            'clientOrderId': None,
            'timestamp': timestamp,
            'datetime': self.iso8601(timestamp),
            'lastTradeTimestamp': None,
            'type': type,
            'side': self.safe_string(response, 'type'),
            'symbol': symbol,
            'status': status,
            'price': self.safe_float(response, 'price'),
            'amount': placedAmount,
            'cost': None,
            'average': None,
            'remaining': remaining,
            'filled': filled,
            'fee': None,
            'trades': None,
        }

    async def cancel_order(self, id, symbol=None, params={}):
        await self.load_markets()
        request = {
            'id': id,
        }
        return await self.privatePostCancelOrder(self.extend(request, params))

    def parse_order(self, order, market=None):
        # Depending on the call, 'time' can be a unix int, unix string or ISO string
        # Yes, really
        timestamp = self.safe_value(order, 'time')
        if isinstance(timestamp, basestring) and timestamp.find('T') >= 0:
            # ISO8601 string
            timestamp = self.parse8601(timestamp)
        else:
            # either integer or string integer
            timestamp = int(timestamp)
        symbol = None
        if market is None:
            baseId = self.safe_string(order, 'symbol1')
            quoteId = self.safe_string(order, 'symbol2')
            base = self.safe_currency_code(baseId)
            quote = self.safe_currency_code(quoteId)
            symbol = base + '/' + quote
            if symbol in self.markets:
                market = self.market(symbol)
        status = self.parse_order_status(self.safe_string(order, 'status'))
        price = self.safe_float(order, 'price')
        amount = self.safe_float(order, 'amount')
        # sell orders can have a negative amount
        # https://github.com/ccxt/ccxt/issues/5338
        if amount is not None:
            amount = abs(amount)
        remaining = self.safe_float_2(order, 'pending', 'remains')
        filled = amount - remaining
        fee = None
        cost = None
        if market is not None:
            symbol = market['symbol']
            taCost = self.safe_float(order, 'ta:' + market['quote'])
            ttaCost = self.safe_float(order, 'tta:' + market['quote'])
            cost = self.sum(taCost, ttaCost)
            baseFee = 'fa:' + market['base']
            baseTakerFee = 'tfa:' + market['base']
            quoteFee = 'fa:' + market['quote']
            quoteTakerFee = 'tfa:' + market['quote']
            feeRate = self.safe_float(order, 'tradingFeeMaker')
            if not feeRate:
                feeRate = self.safe_float(order, 'tradingFeeTaker', feeRate)
            if feeRate:
                feeRate /= 100.0  # convert to mathematically-correct percentage coefficients: 1.0 = 100%
            if (baseFee in order) or (baseTakerFee in order):
                baseFeeCost = self.safe_float_2(order, baseFee, baseTakerFee)
                fee = {
                    'currency': market['base'],
                    'rate': feeRate,
                    'cost': baseFeeCost,
                }
            elif (quoteFee in order) or (quoteTakerFee in order):
                quoteFeeCost = self.safe_float_2(order, quoteFee, quoteTakerFee)
                fee = {
                    'currency': market['quote'],
                    'rate': feeRate,
                    'cost': quoteFeeCost,
                }
        if not cost:
            cost = price * filled
        side = order['type']
        trades = None
        orderId = order['id']
        if 'vtx' in order:
            trades = []
            for i in range(0, len(order['vtx'])):
                item = order['vtx'][i]
                tradeSide = self.safe_string(item, 'type')
                if tradeSide == 'cancel':
                    # looks like self might represent the cancelled part of an order
                    #   {id: '4426729543',
                    #     type: 'cancel',
                    #     time: '2017-09-22T00:24:30.476Z',
                    #     user: 'up106404164',
                    #     c: 'user:up106404164:a:BCH',
                    #     d: 'order:4426728375:a:BCH',
                    #     a: '0.09935956',
                    #     amount: '0.09935956',
                    #     balance: '0.42580261',
                    #     symbol: 'BCH',
                    #     order: '4426728375',
                    #     buy: null,
                    #     sell: null,
                    #     pair: null,
                    #     pos: null,
                    #     cs: '0.42580261',
                    #     ds: 0}
                    continue
                tradePrice = self.safe_float(item, 'price')
                if tradePrice is None:
                    # self represents the order
                    #   {
                    #     "a": "0.47000000",
                    #     "c": "user:up106404164:a:EUR",
                    #     "d": "order:6065499239:a:EUR",
                    #     "cs": "1432.93",
                    #     "ds": "476.72",
                    #     "id": "6065499249",
                    #     "buy": null,
                    #     "pos": null,
                    #     "pair": null,
                    #     "sell": null,
                    #     "time": "2018-04-22T13:07:22.152Z",
                    #     "type": "buy",
                    #     "user": "up106404164",
                    #     "order": "6065499239",
                    #     "amount": "-715.97000000",
                    #     "symbol": "EUR",
                    #     "balance": "1432.93000000"}
                    continue
                # todo: deal with these
                if tradeSide == 'costsNothing':
                    continue
                # --
                # if side != tradeSide:
                #     raise Error(json.dumps(order, null, 2))
                # if orderId != item['order']:
                #     raise Error(json.dumps(order, null, 2))
                # --
                # partial buy trade
                #   {
                #     "a": "0.01589885",
                #     "c": "user:up106404164:a:BTC",
                #     "d": "order:6065499239:a:BTC",
                #     "cs": "0.36300000",
                #     "ds": 0,
                #     "id": "6067991213",
                #     "buy": "6065499239",
                #     "pos": null,
                #     "pair": null,
                #     "sell": "6067991206",
                #     "time": "2018-04-22T23:09:11.773Z",
                #     "type": "buy",
                #     "user": "up106404164",
                #     "order": "6065499239",
                #     "price": 7146.5,
                #     "amount": "0.01589885",
                #     "symbol": "BTC",
                #     "balance": "0.36300000",
                #     "symbol2": "EUR",
                #     "fee_amount": "0.19"}
                # --
                # trade with zero amount, but non-zero fee
                #   {
                #     "a": "0.00000000",
                #     "c": "user:up106404164:a:EUR",
                #     "d": "order:5840654423:a:EUR",
                #     "cs": 559744,
                #     "ds": 0,
                #     "id": "5840654429",
                #     "buy": "5807238573",
                #     "pos": null,
                #     "pair": null,
                #     "sell": "5840654423",
                #     "time": "2018-03-15T03:20:14.010Z",
                #     "type": "sell",
                #     "user": "up106404164",
                #     "order": "5840654423",
                #     "price": 730,
                #     "amount": "0.00000000",
                #     "symbol": "EUR",
                #     "balance": "5597.44000000",
                #     "symbol2": "BCH",
                #     "fee_amount": "0.01"}
                # --
                # trade which should have an amount of exactly 0.002BTC
                #   {
                #     "a": "16.70000000",
                #     "c": "user:up106404164:a:GBP",
                #     "d": "order:9927386681:a:GBP",
                #     "cs": "86.90",
                #     "ds": 0,
                #     "id": "9927401610",
                #     "buy": "9927401601",
                #     "pos": null,
                #     "pair": null,
                #     "sell": "9927386681",
                #     "time": "2019-08-21T15:25:37.777Z",
                #     "type": "sell",
                #     "user": "up106404164",
                #     "order": "9927386681",
                #     "price": 8365,
                #     "amount": "16.70000000",
                #     "office": "UK",
                #     "symbol": "GBP",
                #     "balance": "86.90000000",
                #     "symbol2": "BTC",
                #     "fee_amount": "0.03"
                #   }
                tradeTimestamp = self.parse8601(self.safe_string(item, 'time'))
                tradeAmount = self.safe_float(item, 'amount')
                feeCost = self.safe_float(item, 'fee_amount')
                absTradeAmount = -tradeAmount if (tradeAmount < 0) else tradeAmount
                tradeCost = None
                if tradeSide == 'sell':
                    tradeCost = absTradeAmount
                    absTradeAmount = self.sum(feeCost, tradeCost) / tradePrice
                else:
                    tradeCost = absTradeAmount * tradePrice
                trades.append({
                    'id': self.safe_string(item, 'id'),
                    'timestamp': tradeTimestamp,
                    'datetime': self.iso8601(tradeTimestamp),
                    'order': orderId,
                    'symbol': symbol,
                    'price': tradePrice,
                    'amount': absTradeAmount,
                    'cost': tradeCost,
                    'side': tradeSide,
                    'fee': {
                        'cost': feeCost,
                        'currency': market['quote'],
                    },
                    'info': item,
                    'type': None,
                    'takerOrMaker': None,
                })
        return {
            'id': orderId,
            'clientOrderId': None,
            'datetime': self.iso8601(timestamp),
            'timestamp': timestamp,
            'lastTradeTimestamp': None,
            'status': status,
            'symbol': symbol,
            'type': 'market' if (price is None) else 'limit',
            'timeInForce': None,
            'postOnly': None,
            'side': side,
            'price': price,
            'stopPrice': None,
            'cost': cost,
            'amount': amount,
            'filled': filled,
            'remaining': remaining,
            'trades': trades,
            'fee': fee,
            'info': order,
            'average': None,
        }

    async def fetch_open_orders(self, symbol=None, since=None, limit=None, params={}):
        await self.load_markets()
        request = {}
        method = 'privatePostOpenOrders'
        market = None
        if symbol is not None:
            market = self.market(symbol)
            request['pair'] = market['id']
            method += 'Pair'
        orders = await getattr(self, method)(self.extend(request, params))
        for i in range(0, len(orders)):
            orders[i] = self.extend(orders[i], {'status': 'open'})
        return self.parse_orders(orders, market, since, limit)

    async def fetch_closed_orders(self, symbol=None, since=None, limit=None, params={}):
        await self.load_markets()
        method = 'privatePostArchivedOrdersPair'
        if symbol is None:
            raise ArgumentsRequired(self.id + ' fetchClosedOrders() requires a symbol argument')
        market = self.market(symbol)
        request = {'pair': market['id']}
        response = await getattr(self, method)(self.extend(request, params))
        return self.parse_orders(response, market, since, limit)

    async def fetch_order(self, id, symbol=None, params={}):
        await self.load_markets()
        request = {
            'id': str(id),
        }
        response = await self.privatePostGetOrderTx(self.extend(request, params))
        data = self.safe_value(response, 'data', {})
        #
        #     {
        #         "id": "5442731603",
        #         "type": "sell",
        #         "time": 1516132358071,
        #         "lastTxTime": 1516132378452,
        #         "lastTx": "5442734452",
        #         "pos": null,
        #         "user": "up106404164",
        #         "status": "d",
        #         "symbol1": "ETH",
        #         "symbol2": "EUR",
        #         "amount": "0.50000000",
        #         "kind": "api",
        #         "price": "923.3386",
        #         "tfacf": "1",
        #         "fa:EUR": "0.55",
        #         "ta:EUR": "369.77",
        #         "remains": "0.00000000",
        #         "tfa:EUR": "0.22",
        #         "tta:EUR": "91.95",
        #         "a:ETH:cds": "0.50000000",
        #         "a:EUR:cds": "461.72",
        #         "f:EUR:cds": "0.77",
        #         "tradingFeeMaker": "0.15",
        #         "tradingFeeTaker": "0.23",
        #         "tradingFeeStrategy": "userVolumeAmount",
        #         "tradingFeeUserVolumeAmount": "2896912572",
        #         "orderId": "5442731603",
        #         "next": False,
        #         "vtx": [
        #             {
        #                 "id": "5442734452",
        #                 "type": "sell",
        #                 "time": "2018-01-16T19:52:58.452Z",
        #                 "user": "up106404164",
        #                 "c": "user:up106404164:a:EUR",
        #                 "d": "order:5442731603:a:EUR",
        #                 "a": "104.53000000",
        #                 "amount": "104.53000000",
        #                 "balance": "932.71000000",
        #                 "symbol": "EUR",
        #                 "order": "5442731603",
        #                 "buy": "5442734443",
        #                 "sell": "5442731603",
        #                 "pair": null,
        #                 "pos": null,
        #                 "office": null,
        #                 "cs": "932.71",
        #                 "ds": 0,
        #                 "price": 923.3386,
        #                 "symbol2": "ETH",
        #                 "fee_amount": "0.16"
        #             },
        #             {
        #                 "id": "5442731609",
        #                 "type": "sell",
        #                 "time": "2018-01-16T19:52:38.071Z",
        #                 "user": "up106404164",
        #                 "c": "user:up106404164:a:EUR",
        #                 "d": "order:5442731603:a:EUR",
        #                 "a": "91.73000000",
        #                 "amount": "91.73000000",
        #                 "balance": "563.49000000",
        #                 "symbol": "EUR",
        #                 "order": "5442731603",
        #                 "buy": "5442618127",
        #                 "sell": "5442731603",
        #                 "pair": null,
        #                 "pos": null,
        #                 "office": null,
        #                 "cs": "563.49",
        #                 "ds": 0,
        #                 "price": 924.0092,
        #                 "symbol2": "ETH",
        #                 "fee_amount": "0.22"
        #             },
        #             {
        #                 "id": "5442731604",
        #                 "type": "sell",
        #                 "time": "2018-01-16T19:52:38.071Z",
        #                 "user": "up106404164",
        #                 "c": "order:5442731603:a:ETH",
        #                 "d": "user:up106404164:a:ETH",
        #                 "a": "0.50000000",
        #                 "amount": "-0.50000000",
        #                 "balance": "15.80995000",
        #                 "symbol": "ETH",
        #                 "order": "5442731603",
        #                 "buy": null,
        #                 "sell": null,
        #                 "pair": null,
        #                 "pos": null,
        #                 "office": null,
        #                 "cs": "0.50000000",
        #                 "ds": "15.80995000"
        #             }
        #         ]
        #     }
        #
        return self.parse_order(data)

    async def fetch_orders(self, symbol=None, since=None, limit=None, params={}):
        await self.load_markets()
        market = self.market(symbol)
        request = {
            'limit': limit,
            'pair': market['id'],
            'dateFrom': since,
        }
        response = await self.privatePostArchivedOrdersPair(self.extend(request, params))
        results = []
        for i in range(0, len(response)):
            # cancelled(unfilled):
            #    {id: '4005785516',
            #     type: 'sell',
            #     time: '2017-07-18T19:08:34.223Z',
            #     lastTxTime: '2017-07-18T19:08:34.396Z',
            #     lastTx: '4005785522',
            #     pos: null,
            #     status: 'c',
            #     symbol1: 'ETH',
            #     symbol2: 'GBP',
            #     amount: '0.20000000',
            #     price: '200.5625',
            #     remains: '0.20000000',
            #     'a:ETH:cds': '0.20000000',
            #     tradingFeeMaker: '0',
            #     tradingFeeTaker: '0.16',
            #     tradingFeeUserVolumeAmount: '10155061217',
            #     orderId: '4005785516'}
            # --
            # cancelled(partially filled buy):
            #    {id: '4084911657',
            #     type: 'buy',
            #     time: '2017-08-05T03:18:39.596Z',
            #     lastTxTime: '2019-03-19T17:37:46.404Z',
            #     lastTx: '8459265833',
            #     pos: null,
            #     status: 'cd',
            #     symbol1: 'BTC',
            #     symbol2: 'GBP',
            #     amount: '0.05000000',
            #     price: '2241.4692',
            #     tfacf: '1',
            #     remains: '0.03910535',
            #     'tfa:GBP': '0.04',
            #     'tta:GBP': '24.39',
            #     'a:BTC:cds': '0.01089465',
            #     'a:GBP:cds': '112.26',
            #     'f:GBP:cds': '0.04',
            #     tradingFeeMaker: '0',
            #     tradingFeeTaker: '0.16',
            #     tradingFeeUserVolumeAmount: '13336396963',
            #     orderId: '4084911657'}
            # --
            # cancelled(partially filled sell):
            #    {id: '4426728375',
            #     type: 'sell',
            #     time: '2017-09-22T00:24:20.126Z',
            #     lastTxTime: '2017-09-22T00:24:30.476Z',
            #     lastTx: '4426729543',
            #     pos: null,
            #     status: 'cd',
            #     symbol1: 'BCH',
            #     symbol2: 'BTC',
            #     amount: '0.10000000',
            #     price: '0.11757182',
            #     tfacf: '1',
            #     remains: '0.09935956',
            #     'tfa:BTC': '0.00000014',
            #     'tta:BTC': '0.00007537',
            #     'a:BCH:cds': '0.10000000',
            #     'a:BTC:cds': '0.00007537',
            #     'f:BTC:cds': '0.00000014',
            #     tradingFeeMaker: '0',
            #     tradingFeeTaker: '0.18',
            #     tradingFeeUserVolumeAmount: '3466715450',
            #     orderId: '4426728375'}
            # --
            # filled:
            #    {id: '5342275378',
            #     type: 'sell',
            #     time: '2018-01-04T00:28:12.992Z',
            #     lastTxTime: '2018-01-04T00:28:12.992Z',
            #     lastTx: '5342275393',
            #     pos: null,
            #     status: 'd',
            #     symbol1: 'BCH',
            #     symbol2: 'BTC',
            #     amount: '0.10000000',
            #     kind: 'api',
            #     price: '0.17',
            #     remains: '0.00000000',
            #     'tfa:BTC': '0.00003902',
            #     'tta:BTC': '0.01699999',
            #     'a:BCH:cds': '0.10000000',
            #     'a:BTC:cds': '0.01699999',
            #     'f:BTC:cds': '0.00003902',
            #     tradingFeeMaker: '0.15',
            #     tradingFeeTaker: '0.23',
            #     tradingFeeUserVolumeAmount: '1525951128',
            #     orderId: '5342275378'}
            # --
            # market order(buy):
            #    {"id": "6281946200",
            #     "pos": null,
            #     "time": "2018-05-23T11:55:43.467Z",
            #     "type": "buy",
            #     "amount": "0.00000000",
            #     "lastTx": "6281946210",
            #     "status": "d",
            #     "amount2": "20.00",
            #     "orderId": "6281946200",
            #     "remains": "0.00000000",
            #     "symbol1": "ETH",
            #     "symbol2": "EUR",
            #     "tfa:EUR": "0.05",
            #     "tta:EUR": "19.94",
            #     "a:ETH:cds": "0.03764100",
            #     "a:EUR:cds": "20.00",
            #     "f:EUR:cds": "0.05",
            #     "lastTxTime": "2018-05-23T11:55:43.467Z",
            #     "tradingFeeTaker": "0.25",
            #     "tradingFeeUserVolumeAmount": "55998097"}
            # --
            # market order(sell):
            #   {"id": "6282200948",
            #     "pos": null,
            #     "time": "2018-05-23T12:42:58.315Z",
            #     "type": "sell",
            #     "amount": "-0.05000000",
            #     "lastTx": "6282200958",
            #     "status": "d",
            #     "orderId": "6282200948",
            #     "remains": "0.00000000",
            #     "symbol1": "ETH",
            #     "symbol2": "EUR",
            #     "tfa:EUR": "0.07",
            #     "tta:EUR": "26.49",
            #     "a:ETH:cds": "0.05000000",
            #     "a:EUR:cds": "26.49",
            #     "f:EUR:cds": "0.07",
            #     "lastTxTime": "2018-05-23T12:42:58.315Z",
            #     "tradingFeeTaker": "0.25",
            #     "tradingFeeUserVolumeAmount": "56294576"}
            order = response[i]
            status = self.parse_order_status(self.safe_string(order, 'status'))
            baseId = self.safe_string(order, 'symbol1')
            quoteId = self.safe_string(order, 'symbol2')
            base = self.safe_currency_code(baseId)
            quote = self.safe_currency_code(quoteId)
            symbol = base + '/' + quote
            side = self.safe_string(order, 'type')
            baseAmount = self.safe_float(order, 'a:' + baseId + ':cds')
            quoteAmount = self.safe_float(order, 'a:' + quoteId + ':cds')
            fee = self.safe_float(order, 'f:' + quoteId + ':cds')
            amount = self.safe_float(order, 'amount')
            price = self.safe_float(order, 'price')
            remaining = self.safe_float(order, 'remains')
            filled = amount - remaining
            orderAmount = None
            cost = None
            average = None
            type = None
            if not price:
                type = 'market'
                orderAmount = baseAmount
                cost = quoteAmount
                average = orderAmount / cost
            else:
                ta = self.safe_float(order, 'ta:' + quoteId, 0)
                tta = self.safe_float(order, 'tta:' + quoteId, 0)
                fa = self.safe_float(order, 'fa:' + quoteId, 0)
                tfa = self.safe_float(order, 'tfa:' + quoteId, 0)
                if side == 'sell':
                    cost = self.sum(self.sum(ta, tta), self.sum(fa, tfa))
                else:
                    cost = self.sum(ta, tta) - self.sum(fa, tfa)
                type = 'limit'
                orderAmount = amount
                average = cost / filled
            time = self.safe_string(order, 'time')
            lastTxTime = self.safe_string(order, 'lastTxTime')
            timestamp = self.parse8601(time)
            results.append({
                'id': self.safe_string(order, 'id'),
                'timestamp': timestamp,
                'datetime': self.iso8601(timestamp),
                'lastUpdated': self.parse8601(lastTxTime),
                'status': status,
                'symbol': symbol,
                'side': side,
                'price': price,
                'amount': orderAmount,
                'average': average,
                'type': type,
                'filled': filled,
                'cost': cost,
                'remaining': remaining,
                'fee': {
                    'cost': fee,
                    'currency': quote,
                },
                'info': order,
            })
        return results

    def parse_order_status(self, status):
        return self.safe_string(self.options['order']['status'], status, status)

    async def edit_order(self, id, symbol, type, side, amount=None, price=None, params={}):
        if amount is None:
            raise ArgumentsRequired(self.id + ' editOrder() requires a amount argument')
        if price is None:
            raise ArgumentsRequired(self.id + ' editOrder() requires a price argument')
        await self.load_markets()
        market = self.market(symbol)
        # see: https://cex.io/rest-api#/definitions/CancelReplaceOrderRequest
        request = {
            'pair': market['id'],
            'type': side,
            'amount': amount,
            'price': price,
            'order_id': id,
        }
        response = await self.privatePostCancelReplaceOrderPair(self.extend(request, params))
        return self.parse_order(response, market)

    async def fetch_deposit_address(self, code, params={}):
        if code == 'XRP' or code == 'XLM':
            # https://github.com/ccxt/ccxt/pull/2327#issuecomment-375204856
            raise NotSupported(self.id + ' fetchDepositAddress does not support XRP and XLM addresses yet(awaiting docs from CEX.io)')
        await self.load_markets()
        currency = self.currency(code)
        request = {
            'currency': currency['id'],
        }
        response = await self.privatePostGetAddress(self.extend(request, params))
        address = self.safe_string(response, 'data')
        self.check_address(address)
        return {
            'currency': code,
            'address': address,
            'tag': None,
            'info': response,
        }

    def nonce(self):
        return self.milliseconds()

    def sign(self, path, api='public', method='GET', params={}, headers=None, body=None):
        url = self.urls['api'] + '/' + self.implode_params(path, params)
        query = self.omit(params, self.extract_params(path))
        if api == 'public':
            if query:
                url += '?' + self.urlencode(query)
        else:
            self.check_required_credentials()
            nonce = str(self.nonce())
            auth = nonce + self.uid + self.apiKey
            signature = self.hmac(self.encode(auth), self.encode(self.secret))
            body = self.json(self.extend({
                'key': self.apiKey,
                'signature': signature.upper(),
                'nonce': nonce,
            }, query))
            headers = {
                'Content-Type': 'application/json',
            }
        return {'url': url, 'method': method, 'body': body, 'headers': headers}

    def handle_errors(self, code, reason, url, method, headers, body, response, requestHeaders, requestBody):
        if isinstance(response, list):
            return response  # public endpoints may return []-arrays
        if body == 'true':
            return
        if response is None:
            raise NullResponse(self.id + ' returned ' + self.json(response))
        if 'e' in response:
            if 'ok' in response:
                if response['ok'] == 'ok':
                    return
        if 'error' in response:
            message = self.safe_string(response, 'error')
            feedback = self.id + ' ' + body
            self.throw_exactly_matched_exception(self.exceptions['exact'], message, feedback)
            self.throw_broadly_matched_exception(self.exceptions['broad'], message, feedback)
            raise ExchangeError(feedback)
