# -*- 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
import hashlib
from ccxt.base.errors import ExchangeError
from ccxt.base.errors import AuthenticationError
from ccxt.base.errors import ArgumentsRequired
from ccxt.base.errors import InsufficientFunds
from ccxt.base.errors import InvalidAddress
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.precise import Precise


class gateio(Exchange):

    def describe(self):
        return self.deep_extend(super(gateio, self).describe(), {
            'id': 'gateio',
            'name': 'Gate.io',
            'countries': ['CN'],
            'version': '2',
            'rateLimit': 1000,
            'pro': True,
            'has': {
                'cancelOrder': True,
                'CORS': False,
                'createDepositAddress': True,
                'createMarketOrder': False,
                'createOrder': True,
                'fetchBalance': True,
                'fetchClosedOrders': False,
                'fetchCurrencies': True,
                'fetchDepositAddress': True,
                'fetchDeposits': True,
                'fetchMarkets': True,
                'fetchMyTrades': True,
                'fetchOHLCV': True,
                'fetchOpenOrders': True,
                'fetchOrder': True,
                'fetchOrderBook': True,
                'fetchOrders': True,
                'fetchOrderTrades': True,
                'fetchTicker': True,
                'fetchTickers': True,
                'fetchTrades': True,
                'fetchTransactions': True,
                'fetchWithdrawals': True,
                'withdraw': True,
            },
            'timeframes': {
                '1m': 60,
                '5m': 300,
                '10m': 600,
                '15m': 900,
                '30m': 1800,
                '1h': 3600,
                '2h': 7200,
                '4h': 14400,
                '6h': 21600,
                '12h': 43200,
                '1d': 86400,
                '1w': 604800,
            },
            'urls': {
                'logo': 'https://user-images.githubusercontent.com/1294454/31784029-0313c702-b509-11e7-9ccc-bc0da6a0e435.jpg',
                'api': {
                    'public': 'https://data.gate.io/api',
                    'private': 'https://data.gate.io/api',
                },
                'www': 'https://gate.io/',
                'doc': 'https://gate.io/api2',
                'fees': [
                    'https://gate.io/fee',
                    'https://support.gate.io/hc/en-us/articles/115003577673',
                ],
                'referral': 'https://www.gate.io/signup/2436035',
            },
            'api': {
                'public': {
                    'get': [
                        'candlestick2/{id}',
                        'pairs',
                        'coininfo',
                        'marketinfo',
                        'marketlist',
                        'coininfo',
                        'tickers',
                        'ticker/{id}',
                        'orderBook/{id}',
                        'trade/{id}',
                        'tradeHistory/{id}',
                        'tradeHistory/{id}/{tid}',
                    ],
                },
                'private': {
                    'post': [
                        'balances',
                        'depositAddress',
                        'newAddress',
                        'depositsWithdrawals',
                        'buy',
                        'sell',
                        'cancelOrder',
                        'cancelAllOrders',
                        'getOrder',
                        'openOrders',
                        'tradeHistory',
                        'feelist',
                        'withdraw',
                        'get_sub_account_available',
                        'sub_account_transfer',
                    ],
                },
            },
            'fees': {
                'trading': {
                    'tierBased': True,
                    'percentage': True,
                    'maker': 0.002,
                    'taker': 0.002,
                },
            },
            'exceptions': {
                'exact': {
                    '4': DDoSProtection,
                    '5': AuthenticationError,  # {result: "false", code:  5, message: "Error: invalid key or sign, please re-generate it from your account"}
                    '6': AuthenticationError,  # {result: 'false', code: 6, message: 'Error: invalid data  '}
                    '7': NotSupported,
                    '8': NotSupported,
                    '9': NotSupported,
                    '15': DDoSProtection,
                    '16': OrderNotFound,
                    '17': OrderNotFound,
                    '20': InvalidOrder,
                    '21': InsufficientFunds,
                },
                # https://gate.io/api2#errCode
                'errorCodeNames': {
                    '1': 'Invalid request',
                    '2': 'Invalid version',
                    '3': 'Invalid request',
                    '4': 'Too many attempts',
                    '5': 'Invalid sign',
                    '6': 'Invalid sign',
                    '7': 'Currency is not supported',
                    '8': 'Currency is not supported',
                    '9': 'Currency is not supported',
                    '10': 'Verified failed',
                    '11': 'Obtaining address failed',
                    '12': 'Empty params',
                    '13': 'Internal error, please report to administrator',
                    '14': 'Invalid user',
                    '15': 'Cancel order too fast, please wait 1 min and try again',
                    '16': 'Invalid order id or order is already closed',
                    '17': 'Invalid orderid',
                    '18': 'Invalid amount',
                    '19': 'Not permitted or trade is disabled',
                    '20': 'Your order size is too small',
                    '21': 'You don\'t have enough fund',
                },
            },
            'options': {
                'limits': {
                    'cost': {
                        'min': {
                            'BTC': '0.0001',
                            'ETH': '0.001',
                            'USDT': '1',
                        },
                    },
                },
            },
            'commonCurrencies': {
                '88MPH': 'MPH',
                'BIFI': 'Bitcoin File',
                'BOX': 'DefiBox',
                'BTCBEAR': 'BEAR',
                'BTCBULL': 'BULL',
                'MPH': 'Morpher',  # conflict with 88MPH
                'RAI': 'Rai Reflex Index',  # conflict with RAI Finance
                'SBTC': 'Super Bitcoin',
                'TNC': 'Trinity Network Credit',
                'VAI': 'VAIOT',
            },
        })

    async def fetch_currencies(self, params={}):
        response = await self.publicGetCoininfo(params)
        #
        #     {
        #         "result":"true",
        #         "coins":[
        #             {
        #                 "CNYX":{
        #                     "delisted":0,
        #                     "withdraw_disabled":1,
        #                     "withdraw_delayed":0,
        #                     "deposit_disabled":0,
        #                     "trade_disabled":0
        #                 }
        #             },
        #             {
        #                 "USDT_ETH":{
        #                     "delisted":0,
        #                     "withdraw_disabled":1,
        #                     "withdraw_delayed":0,
        #                     "deposit_disabled":0,
        #                     "trade_disabled":1
        #                 }
        #             }
        #         ]
        #     }
        #
        coins = self.safe_value(response, 'coins')
        if not coins:
            raise ExchangeError(self.id + ' fetchCurrencies got an unrecognized response')
        result = {}
        for i in range(0, len(coins)):
            coin = coins[i]
            ids = list(coin.keys())
            for j in range(0, len(ids)):
                id = ids[j]
                currency = coin[id]
                code = self.safe_currency_code(id)
                delisted = self.safe_value(currency, 'delisted', 0)
                withdrawDisabled = self.safe_integer_2(currency, 'withdraw_disabled', 0)
                depositDisabled = self.safe_integer_2(currency, 'deposit_disabled', 0)
                tradeDisabled = self.safe_integer_2(currency, 'trade_disabled', 0)
                listed = (delisted == 0)
                withdrawEnabled = (withdrawDisabled == 0)
                depositEnabled = (depositDisabled == 0)
                tradeEnabled = (tradeDisabled == 0)
                active = listed and withdrawEnabled and depositEnabled and tradeEnabled
                result[code] = {
                    'id': id,
                    'code': code,
                    'active': active,
                    'info': currency,
                    'name': None,
                    'fee': None,
                    'precision': None,
                    'limits': {
                        'amount': {
                            'min': None,
                            'max': None,
                        },
                        'withdraw': {
                            'min': None,
                            'max': None,
                        },
                    },
                }
        return result

    async def fetch_markets(self, params={}):
        response = await self.publicGetMarketinfo(params)
        #
        #     {
        #         "result":"true",
        #         "pairs":[
        #             {
        #                 "usdt_cnyx":{
        #                     "decimal_places":3,
        #                     "amount_decimal_places":3,
        #                     "min_amount":1,
        #                     "min_amount_a":1,
        #                     "min_amount_b":3,
        #                     "fee":0.02,
        #                     "trade_disabled":0,
        #                     "buy_disabled":0,
        #                     "sell_disabled":0
        #                 }
        #             },
        #         ]
        #     }
        #
        markets = self.safe_value(response, 'pairs')
        if not markets:
            raise ExchangeError(self.id + ' fetchMarkets got an unrecognized response')
        result = []
        for i in range(0, len(markets)):
            market = markets[i]
            keys = list(market.keys())
            id = self.safe_string(keys, 0)
            details = market[id]
            # all of their symbols are separated with an underscore
            # but not boe_eth_eth(BOE_ETH/ETH) which has two underscores
            # https://github.com/ccxt/ccxt/issues/4894
            parts = id.split('_')
            numParts = len(parts)
            baseId = parts[0]
            quoteId = parts[1]
            if numParts > 2:
                baseId = parts[0] + '_' + parts[1]
                quoteId = parts[2]
            base = self.safe_currency_code(baseId)
            quote = self.safe_currency_code(quoteId)
            symbol = base + '/' + quote
            pricePrecisionString = self.safe_string(details, 'decimal_places')
            priceLimit = self.parse_precision(pricePrecisionString)
            precision = {
                'amount': self.safe_integer(details, 'amount_decimal_places'),
                'price': int(pricePrecisionString),
            }
            amountLimit = self.safe_string(details, 'min_amount')
            amountLimits = {
                'min': self.parse_number(amountLimit),
                'max': None,
            }
            priceLimits = {
                'min': self.parse_number(priceLimit),
                'max': None,
            }
            defaultCost = self.parse_number(Precise.string_mul(amountLimit, priceLimit))
            minCost = self.safe_number(self.options['limits']['cost']['min'], quote, defaultCost)
            costLimits = {
                'min': minCost,
                'max': None,
            }
            limits = {
                'amount': amountLimits,
                'price': priceLimits,
                'cost': costLimits,
            }
            disabled = self.safe_integer(details, 'trade_disabled')
            active = not disabled
            uppercaseId = id.upper()
            feeString = self.safe_string(details, 'fee')
            feeScaled = Precise.string_div(feeString, '100')
            result.append({
                'id': id,
                'uppercaseId': uppercaseId,
                'symbol': symbol,
                'base': base,
                'quote': quote,
                'baseId': baseId,
                'quoteId': quoteId,
                'info': market,
                'active': active,
                'maker': self.parse_number(feeScaled),
                'taker': self.parse_number(feeScaled),
                'precision': precision,
                'limits': limits,
            })
        return result

    async def fetch_balance(self, params={}):
        await self.load_markets()
        response = await self.privatePostBalances(params)
        result = {'info': response}
        available = self.safe_value(response, 'available', {})
        if isinstance(available, list):
            available = {}
        locked = self.safe_value(response, 'locked', {})
        currencyIds = list(available.keys())
        for i in range(0, len(currencyIds)):
            currencyId = currencyIds[i]
            code = self.safe_currency_code(currencyId)
            account = self.account()
            account['free'] = self.safe_string(available, currencyId)
            account['used'] = self.safe_string(locked, currencyId)
            result[code] = account
        return self.parse_balance(result, False)

    async def fetch_order_book(self, symbol, limit=None, params={}):
        await self.load_markets()
        request = {
            'id': self.market_id(symbol),
        }
        response = await self.publicGetOrderBookId(self.extend(request, params))
        return self.parse_order_book(response, symbol)

    def parse_ohlcv(self, ohlcv, market=None):
        # they return [Timestamp, Volume, Close, High, Low, Open]
        return [
            self.safe_integer(ohlcv, 0),  # t
            self.safe_number(ohlcv, 5),  # o
            self.safe_number(ohlcv, 3),  # h
            self.safe_number(ohlcv, 4),  # l
            self.safe_number(ohlcv, 2),  # c
            self.safe_number(ohlcv, 1),  # v
        ]

    async def fetch_ohlcv(self, symbol, timeframe='1m', since=None, limit=None, params={}):
        await self.load_markets()
        market = self.market(symbol)
        request = {
            'id': market['id'],
            'group_sec': self.timeframes[timeframe],
        }
        # max limit = 1001
        # if limit is not None:
        #     periodDurationInSeconds = self.parse_timeframe(timeframe)
        #     hours = int((periodDurationInSeconds * limit) / 3600)
        #     request['range_hour'] = max(1, hours - 1)
        # }
        response = await self.publicGetCandlestick2Id(self.extend(request, params))
        #
        #     {
        #         "elapsed": "15ms",
        #         "result": "true",
        #         "data": [
        #             ["1553930820000", "1.005299", "4081.05", "4086.18", "4081.05", "4086.18"],
        #             ["1553930880000", "0.110923277", "4095.2", "4095.23", "4091.15", "4091.15"],
        #             ...
        #             ["1553934420000", "0", "4089.42", "4089.42", "4089.42", "4089.42"],
        #         ]
        #     }
        #
        data = self.safe_value(response, 'data', [])
        return self.parse_ohlcvs(data, market, timeframe, since, limit)

    def parse_ticker(self, ticker, market=None):
        timestamp = self.milliseconds()
        symbol = None
        if market:
            symbol = market['symbol']
        last = self.safe_number(ticker, 'last')
        percentage = self.safe_number(ticker, 'percentChange')
        open = None
        change = None
        average = None
        if (last is not None) and (percentage is not None):
            relativeChange = percentage / 100
            open = last / self.sum(1, relativeChange)
            change = last - open
            average = self.sum(last, open) / 2
        open = self.safe_number(ticker, 'open', open)
        change = self.safe_number(ticker, 'change', change)
        return {
            'symbol': symbol,
            'timestamp': timestamp,
            'datetime': self.iso8601(timestamp),
            'high': self.safe_number_2(ticker, 'high24hr', 'high'),
            'low': self.safe_number_2(ticker, 'low24hr', 'low'),
            'bid': self.safe_number(ticker, 'highestBid'),
            'bidVolume': None,
            'ask': self.safe_number(ticker, 'lowestAsk'),
            'askVolume': None,
            'vwap': None,
            'open': open,
            'close': last,
            'last': last,
            'previousClose': None,
            'change': change,
            'percentage': percentage,
            'average': average,
            'baseVolume': self.safe_number(ticker, 'quoteVolume'),  # gateio has them reversed
            'quoteVolume': self.safe_number(ticker, 'baseVolume'),
            'info': ticker,
        }

    async def fetch_tickers(self, symbols=None, params={}):
        await self.load_markets()
        response = await self.publicGetTickers(params)
        result = {}
        ids = list(response.keys())
        for i in range(0, len(ids)):
            id = ids[i]
            market = self.safe_market(id, None, '_')
            symbol = market['symbol']
            result[symbol] = self.parse_ticker(response[id], market)
        return self.filter_by_array(result, 'symbol', symbols)

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

    def parse_trade(self, trade, market=None):
        # {
        #     "tradeID": 3175762,
        #     "date": "2017-08-25 07:24:28",
        #     "type": "sell",
        #     "rate": 29011,
        #     "amount": 0.0019,
        #     "total": 55.1209,
        #     "fee": "0",
        #     "fee_coin": "btc",
        #     "gt_fee":"0",
        #     "point_fee":"0.1213",
        # },
        timestamp = self.safe_timestamp_2(trade, 'timestamp', 'time_unix')
        timestamp = self.safe_timestamp(trade, 'time', timestamp)
        id = self.safe_string_2(trade, 'tradeID', 'id')
        # take either of orderid or orderId
        orderId = self.safe_string_2(trade, 'orderid', 'orderNumber')
        priceString = self.safe_string_2(trade, 'rate', 'price')
        amountString = self.safe_string(trade, 'amount')
        price = self.parse_number(priceString)
        amount = self.parse_number(amountString)
        cost = self.parse_number(Precise.string_mul(priceString, amountString))
        type = self.safe_string(trade, 'type')
        takerOrMaker = self.safe_string(trade, 'role')
        symbol = None
        if market is not None:
            symbol = market['symbol']
        fee = None
        feeCurrency = self.safe_currency_code(self.safe_string(trade, 'fee_coin'))
        feeCost = self.safe_number(trade, 'point_fee')
        if (feeCost is None) or (feeCost == 0):
            feeCost = self.safe_number(trade, 'gt_fee')
            if (feeCost is None) or (feeCost == 0):
                feeCost = self.safe_number(trade, 'fee')
            else:
                feeCurrency = self.safe_currency_code('GT')
        else:
            feeCurrency = self.safe_currency_code('POINT')
        if feeCost is not None:
            fee = {
                'cost': feeCost,
                'currency': feeCurrency,
            }
        return {
            'id': id,
            'info': trade,
            'timestamp': timestamp,
            'datetime': self.iso8601(timestamp),
            'symbol': symbol,
            'order': orderId,
            'type': None,
            'side': type,
            'takerOrMaker': takerOrMaker,
            'price': price,
            'amount': amount,
            'cost': cost,
            'fee': fee,
        }

    async def fetch_trades(self, symbol, since=None, limit=None, params={}):
        await self.load_markets()
        market = self.market(symbol)
        request = {
            'id': market['id'],
        }
        method = None
        if 'tid' in params:
            method = 'publicGetTradeHistoryIdTid'
        else:
            method = 'publicGetTradeHistoryId'
        response = await getattr(self, method)(self.extend(request, params))
        return self.parse_trades(response['data'], market, since, limit)

    async def fetch_orders(self, symbol=None, since=None, limit=None, params={}):
        response = await self.privatePostOpenOrders(params)
        return self.parse_orders(response['orders'], None, since, limit)

    async def fetch_order(self, id, symbol=None, params={}):
        await self.load_markets()
        request = {
            'orderNumber': id,
            'currencyPair': self.market_id(symbol),
        }
        response = await self.privatePostGetOrder(self.extend(request, params))
        return self.parse_order(response['order'])

    def parse_order_status(self, status):
        statuses = {
            'cancelled': 'canceled',
            # 'closed': 'closed',  # these two statuses aren't actually needed
            # 'open': 'open',  # as they are mapped one-to-one
        }
        return self.safe_string(statuses, status, status)

    def parse_order(self, order, market=None):
        #
        # createOrder
        #
        #     {
        #        "fee": "0 ZEC",
        #         "code": 0,
        #         "rate": "0.0055",
        #         "side": 2,
        #         "type": "buy",
        #         "ctime": 1586460839.138,
        #         "market": "ZEC_BTC",
        #         "result": "true",
        #         "status": "open",
        #         "iceberg": "0",
        #         "message": "Success",
        #         "feeValue": "0",
        #         "filledRate": "0.005500000",
        #         "leftAmount": "0.60607456",
        #         "feeCurrency": "ZEC",
        #         "orderNumber": 10755887009,
        #         "filledAmount": "0",
        #         "feePercentage": 0.002,
        #         "initialAmount": "0.60607456"
        #     }
        #
        #     {
        #         'amount': '0.00000000',
        #         'currencyPair': 'xlm_usdt',
        #         'fee': '0.0113766632239302 USDT',
        #         'feeCurrency': 'USDT',
        #         'feePercentage': 0.18,
        #         'feeValue': '0.0113766632239302',
        #         'filledAmount': '30.14004987',
        #         'filledRate': 0.2097,
        #         'initialAmount': '30.14004987',
        #         'initialRate': '0.2097',
        #         'left': 0,
        #         'orderNumber': '998307286',
        #         'rate': '0.2097',
        #         'status': 'closed',
        #         'timestamp': 1531158583,
        #         'type': 'sell'
        #     }
        #
        #     {
        #         "orderNumber": 10802237760,
        #         "orderType": 1,
        #         "type": "buy",
        #         "rate": "0.54250000",
        #         "amount": "45.55638518",
        #         "total": "24.71433896",
        #         "initialRate": "0.54250000",
        #         "initialAmount": "45.55638518",
        #         "filledRate": "0.54250000",
        #         "filledAmount": "0",
        #         "currencyPair": "nano_usdt",
        #         "timestamp": 1586556143,
        #         "status": "open"
        #     }
        #
        id = self.safe_string_2(order, 'orderNumber', 'id')
        marketId = self.safe_string(order, 'currencyPair')
        symbol = self.safe_symbol(marketId, market, '_')
        timestamp = self.safe_timestamp_2(order, 'timestamp', 'ctime')
        lastTradeTimestamp = self.safe_timestamp(order, 'mtime')
        status = self.parse_order_status(self.safe_string(order, 'status'))
        side = self.safe_string(order, 'type')
        # handling for order.update messages
        if side == '1':
            side = 'sell'
        elif side == '2':
            side = 'buy'
        price = self.safe_number_2(order, 'initialRate', 'rate')
        average = self.safe_number(order, 'filledRate')
        amount = self.safe_number_2(order, 'initialAmount', 'amount')
        filled = self.safe_number(order, 'filledAmount')
        # In the order status response, self field has a different name.
        remaining = self.safe_number_2(order, 'leftAmount', 'left')
        feeCost = self.safe_number(order, 'feeValue')
        feeCurrencyId = self.safe_string(order, 'feeCurrency')
        feeCurrencyCode = self.safe_currency_code(feeCurrencyId)
        feeRate = self.safe_number(order, 'feePercentage')
        if feeRate is not None:
            feeRate = feeRate / 100
        return self.safe_order({
            'id': id,
            'clientOrderId': None,
            'datetime': self.iso8601(timestamp),
            'timestamp': timestamp,
            'lastTradeTimestamp': lastTradeTimestamp,
            'status': status,
            'symbol': symbol,
            'type': 'limit',
            'timeInForce': None,
            'postOnly': None,
            'side': side,
            'price': price,
            'stopPrice': None,
            'cost': None,
            'amount': amount,
            'filled': filled,
            'remaining': remaining,
            'average': average,
            'trades': None,
            'fee': {
                'cost': feeCost,
                'currency': feeCurrencyCode,
                'rate': feeRate,
            },
            'info': order,
        })

    async def create_order(self, symbol, type, side, amount, price=None, params={}):
        if type == 'market':
            raise ExchangeError(self.id + ' allows limit orders only')
        await self.load_markets()
        method = 'privatePost' + self.capitalize(side)
        market = self.market(symbol)
        request = {
            'currencyPair': market['id'],
            'rate': price,
            'amount': amount,
        }
        response = await getattr(self, method)(self.extend(request, params))
        return self.parse_order(self.extend({
            'status': 'open',
            'type': side,
            'initialAmount': amount,
        }, response), market)

    async def cancel_order(self, id, symbol=None, params={}):
        if symbol is None:
            raise ArgumentsRequired(self.id + ' cancelOrder() requires symbol argument')
        await self.load_markets()
        request = {
            'orderNumber': id,
            'currencyPair': self.market_id(symbol),
        }
        return await self.privatePostCancelOrder(self.extend(request, params))

    async def query_deposit_address(self, method, code, params={}):
        await self.load_markets()
        currency = self.currency(code)
        method = 'privatePost' + method + 'Address'
        request = {
            'currency': currency['id'],
        }
        response = await getattr(self, method)(self.extend(request, params))
        address = self.safe_string(response, 'addr')
        tag = None
        if (address is not None) and (address.find('address') >= 0):
            raise InvalidAddress(self.id + ' queryDepositAddress ' + address)
        if (code == 'XRP') or (code == 'HBAR') or (code == 'STEEM') or (code == 'XLM') or (code == 'EOS'):
            parts = address.split(' ')
            address = parts[0]
            tag = parts[1]
        return {
            'currency': code,
            'address': address,
            'tag': tag,
            'info': response,
        }

    async def create_deposit_address(self, code, params={}):
        return await self.query_deposit_address('New', code, params)

    async def fetch_deposit_address(self, code, params={}):
        return await self.query_deposit_address('Deposit', code, params)

    async def fetch_open_orders(self, symbol=None, since=None, limit=None, params={}):
        await self.load_markets()
        market = None
        if symbol is not None:
            market = self.market(symbol)
        response = await self.privatePostOpenOrders(params)
        return self.parse_orders(response['orders'], market, since, limit)

    async def fetch_order_trades(self, id, symbol=None, since=None, limit=None, params={}):
        if symbol is None:
            raise ArgumentsRequired(self.id + ' fetchOrderTrades() requires a symbol argument')
        await self.load_markets()
        market = self.market(symbol)
        request = {
            'currencyPair': market['id'],
            'orderNumber': id,
        }
        response = await self.privatePostTradeHistory(self.extend(request, params))
        return self.parse_trades(response['trades'], market, since, limit)

    async def fetch_my_trades(self, symbol=None, since=None, limit=None, params={}):
        if symbol is None:
            raise ArgumentsRequired(self.id + ' fetchMyTrades() requires symbol argument')
        await self.load_markets()
        market = self.market(symbol)
        request = {
            'currencyPair': market['id'],
        }
        response = await self.privatePostTradeHistory(self.extend(request, params))
        return self.parse_trades(response['trades'], market, since, limit)

    async def withdraw(self, code, amount, address, tag=None, params={}):
        self.check_address(address)
        await self.load_markets()
        currency = self.currency(code)
        request = {
            'currency': currency['id'],
            'amount': amount,
            'address': address,  # Address must exist in you AddressBook in security settings
        }
        if tag is not None:
            request['address'] += ' ' + tag
        response = await self.privatePostWithdraw(self.extend(request, params))
        return {
            'info': response,
            'id': self.safe_string(response, 'withdrawid'),
        }

    async def fetch_transactions_by_type(self, type=None, code=None, since=None, limit=None, params={}):
        await self.load_markets()
        request = {}
        if since is not None:
            request['start'] = since
        response = await self.privatePostDepositsWithdrawals(self.extend(request, params))
        transactions = None
        if type is None:
            deposits = self.safe_value(response, 'deposits', [])
            withdrawals = self.safe_value(response, 'withdraws', [])
            transactions = self.array_concat(deposits, withdrawals)
        else:
            transactions = self.safe_value(response, type, [])
        currency = None
        if code is not None:
            currency = self.currency(code)
        return self.parse_transactions(transactions, currency, since, limit)

    async def fetch_transactions(self, code=None, since=None, limit=None, params={}):
        return await self.fetch_transactions_by_type(None, code, since, limit, params)

    async def fetch_deposits(self, code=None, since=None, limit=None, params={}):
        return await self.fetch_transactions_by_type('deposits', code, since, limit, params)

    async def fetch_withdrawals(self, code=None, since=None, limit=None, params={}):
        return await self.fetch_transactions_by_type('withdraws', code, since, limit, params)

    def parse_transaction(self, transaction, currency=None):
        #
        # deposit
        #
        #     {
        #         'id': 'd16520849',
        #         'currency': 'NEO',
        #         'address': False,
        #         'amount': '1',
        #         'txid': '01acf6b8ce4d24a....',
        #         'timestamp': '1553125968',
        #         'status': 'DONE',
        #         'type': 'deposit'
        #     }
        #
        # withdrawal
        #
        #     {
        #         "id": "w6754336",
        #         "fee": "0.1",
        #         "txid": "zzyy",
        #         "amount": "1",
        #         "status": "DONE",
        #         "address": "tz11234",
        #         "currency": "XTZ",
        #         "timestamp": "1561030206"
        #    }
        #
        currencyId = self.safe_string(transaction, 'currency')
        code = self.safe_currency_code(currencyId, currency)
        id = self.safe_string(transaction, 'id')
        txid = self.safe_string(transaction, 'txid')
        amount = self.safe_number(transaction, 'amount')
        address = self.safe_string(transaction, 'address')
        if address == 'false':
            address = None
        timestamp = self.safe_timestamp(transaction, 'timestamp')
        status = self.parse_transaction_status(self.safe_string(transaction, 'status'))
        type = self.parse_transaction_type(id[0])
        feeCost = self.safe_number(transaction, 'fee')
        fee = None
        if feeCost is not None:
            fee = {
                'currency': code,
                'cost': feeCost,
            }
            if amount is not None:
                amount = amount - feeCost
        return {
            'info': transaction,
            'id': id,
            'txid': txid,
            'currency': code,
            'amount': amount,
            'address': address,
            'tag': None,
            'status': status,
            'type': type,
            'timestamp': timestamp,
            'datetime': self.iso8601(timestamp),
            'fee': fee,
        }

    def parse_transaction_status(self, status):
        statuses = {
            'PEND': 'pending',
            'REQUEST': 'pending',
            'DMOVE': 'pending',
            'CANCEL': 'failed',
            'DONE': 'ok',
        }
        return self.safe_string(statuses, status, status)

    def parse_transaction_type(self, type):
        types = {
            'd': 'deposit',
            'w': 'withdrawal',
        }
        return self.safe_string(types, type, type)

    def handle_errors(self, code, reason, url, method, headers, body, response, requestHeaders, requestBody):
        if response is None:
            return
        resultString = self.safe_string(response, 'result', '')
        if resultString != 'false':
            return
        errorCode = self.safe_string(response, 'code')
        message = self.safe_string(response, 'message', body)
        if errorCode is not None:
            feedback = self.safe_string(self.exceptions['errorCodeNames'], errorCode, message)
            self.throw_exactly_matched_exception(self.exceptions['exact'], errorCode, feedback)

    def sign(self, path, api='public', method='GET', params={}, headers=None, body=None):
        prefix = (api + '/') if (api == 'private') else ''
        url = self.urls['api'][api] + self.version + '/1/' + prefix + 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 = self.nonce()
            request = {'nonce': nonce}
            body = self.rawencode(self.extend(request, query))
            # gateio does not like the plus sign in the URL query
            # https://github.com/ccxt/ccxt/issues/4529
            body = body.replace('+', ' ')
            signature = self.hmac(self.encode(body), self.encode(self.secret), hashlib.sha512)
            headers = {
                'Key': self.apiKey,
                'Sign': signature,
                'Content-Type': 'application/x-www-form-urlencoded',
            }
        return {'url': url, 'method': method, 'body': body, 'headers': headers}
