# -*- 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
import math
from ccxt.base.errors import ExchangeError
from ccxt.base.errors import AuthenticationError
from ccxt.base.errors import PermissionDenied
from ccxt.base.errors import ArgumentsRequired
from ccxt.base.errors import BadRequest
from ccxt.base.errors import BadSymbol
from ccxt.base.errors import InsufficientFunds
from ccxt.base.errors import InvalidOrder
from ccxt.base.errors import OrderNotFound
from ccxt.base.errors import NetworkError
from ccxt.base.errors import ExchangeNotAvailable
from ccxt.base.errors import OnMaintenance
from ccxt.base.errors import RequestTimeout
from ccxt.base.decimal_to_precision import TRUNCATE


class huobipro(Exchange):

    def describe(self):
        return self.deep_extend(super(huobipro, self).describe(), {
            'id': 'huobipro',
            'name': 'Huobi Pro',
            'countries': ['CN'],
            'rateLimit': 2000,
            'userAgent': self.userAgents['chrome39'],
            'version': 'v1',
            'accounts': None,
            'accountsById': None,
            'hostname': 'api.huobi.pro',  # api.testnet.huobi.pro
            'pro': True,
            'has': {
                'cancelOrder': True,
                'CORS': False,
                'createOrder': True,
                'fetchBalance': True,
                'fetchClosedOrders': True,
                'fetchCurrencies': True,
                'fetchDepositAddress': True,
                'fetchDeposits': True,
                'fetchMarkets': True,
                'fetchMyTrades': True,
                'fetchOHLCV': True,
                'fetchOpenOrders': True,
                'fetchOrder': True,
                'fetchOrderBook': True,
                'fetchOrders': True,
                'fetchTicker': True,
                'fetchTickers': True,
                'fetchTrades': True,
                'fetchTradingLimits': True,
                'fetchWithdrawals': True,
                'withdraw': True,
            },
            'timeframes': {
                '1m': '1min',
                '5m': '5min',
                '15m': '15min',
                '30m': '30min',
                '1h': '60min',
                '4h': '4hour',
                '1d': '1day',
                '1w': '1week',
                '1M': '1mon',
                '1y': '1year',
            },
            'urls': {
                'test': {
                    'market': 'https://api.testnet.huobi.pro',
                    'public': 'https://api.testnet.huobi.pro',
                    'private': 'https://api.testnet.huobi.pro',
                },
                'logo': 'https://user-images.githubusercontent.com/1294454/76137448-22748a80-604e-11ea-8069-6e389271911d.jpg',
                'api': {
                    'market': 'https://{hostname}',
                    'public': 'https://{hostname}',
                    'private': 'https://{hostname}',
                    'v2Public': 'https://{hostname}',
                    'v2Private': 'https://{hostname}',
                },
                'www': 'https://www.huobi.com',
                'referral': 'https://www.huobi.com/en-us/topic/invited/?invite_code=rwrd3',
                'doc': 'https://huobiapi.github.io/docs/spot/v1/cn/',
                'fees': 'https://www.huobi.com/about/fee/',
            },
            'api': {
                'v2Public': {
                    'get': [
                        'reference/currencies',
                    ],
                },
                'v2Private': {
                    'get': [
                        'account/ledger',
                        'account/withdraw/quota',
                        'account/withdraw/address',  # 提币地址查询(限母用户可用)
                        'account/deposit/address',
                        'reference/transact-fee-rate',
                        'account/asset-valuation',  # 获取账户资产估值
                        'point/account',  # 点卡余额查询
                        'sub-user/user-list',  # 获取子用户列表
                        'sub-user/user-state',  # 获取特定子用户的用户状态
                        'sub-user/account-list',  # 获取特定子用户的账户列表
                        'sub-user/deposit-address',  # 子用户充币地址查询
                        'sub-user/query-deposit',  # 子用户充币记录查询
                        'user/api-key',  # 母子用户API key信息查询
                    ],
                    'post': [
                        'account/transfer',
                        'point/transfer',  # 点卡划转
                        'sub-user/management',  # 冻结/解冻子用户
                        'sub-user/creation',  # 子用户创建
                        'sub-user/tradable-market',  # 设置子用户交易权限
                        'sub-user/transferability',  # 设置子用户资产转出权限
                        'sub-user/api-key-generation',  # 子用户API key创建
                        'sub-user/api-key-modification',  # 修改子用户API key
                        'sub-user/api-key-deletion',  # 删除子用户API key
                    ],
                },
                'market': {
                    'get': [
                        'history/kline',  # 获取K线数据
                        'detail/merged',  # 获取聚合行情(Ticker)
                        'depth',  # 获取 Market Depth 数据
                        'trade',  # 获取 Trade Detail 数据
                        'history/trade',  # 批量获取最近的交易记录
                        'detail',  # 获取 Market Detail 24小时成交量数据
                        'tickers',
                    ],
                },
                'public': {
                    'get': [
                        'common/symbols',  # 查询系统支持的所有交易对
                        'common/currencys',  # 查询系统支持的所有币种
                        'common/timestamp',  # 查询系统当前时间
                        'common/exchange',  # order limits
                        'settings/currencys',  # ?language=en-US
                    ],
                },
                'private': {
                    'get': [
                        'account/accounts',  # 查询当前用户的所有账户(即account-id)
                        'account/accounts/{id}/balance',  # 查询指定账户的余额
                        'account/accounts/{sub-uid}',
                        'account/history',
                        'cross-margin/loan-info',
                        'margin/loan-info',  # 查询借币币息率及额度
                        'fee/fee-rate/get',
                        'order/openOrders',
                        'order/orders',
                        'order/orders/{id}',  # 查询某个订单详情
                        'order/orders/{id}/matchresults',  # 查询某个订单的成交明细
                        'order/orders/getClientOrder',
                        'order/history',  # 查询当前委托、历史委托
                        'order/matchresults',  # 查询当前成交、历史成交
                        'dw/withdraw-virtual/addresses',  # 查询虚拟币提现地址（Deprecated）
                        'query/deposit-withdraw',
                        'margin/loan-info',
                        'margin/loan-orders',  # 借贷订单
                        'margin/accounts/balance',  # 借贷账户详情
                        'cross-margin/loan-orders',  # 查询借币订单
                        'cross-margin/accounts/balance',  # 借币账户详情
                        'points/actions',
                        'points/orders',
                        'subuser/aggregate-balance',
                        'stable-coin/exchange_rate',
                        'stable-coin/quote',
                    ],
                    'post': [
                        'account/transfer',  # 资产划转(该节点为母用户和子用户进行资产划转的通用接口。)
                        'futures/transfer',
                        'order/batch-orders',
                        'order/orders/place',  # 创建并执行一个新订单(一步下单， 推荐使用)
                        'order/orders/submitCancelClientOrder',
                        'order/orders/batchCancelOpenOrders',
                        'order/orders',  # 创建一个新的订单请求 （仅创建订单，不执行下单）
                        'order/orders/{id}/place',  # 执行一个订单 （仅执行已创建的订单）
                        'order/orders/{id}/submitcancel',  # 申请撤销一个订单请求
                        'order/orders/batchcancel',  # 批量撤销订单
                        'dw/balance/transfer',  # 资产划转
                        'dw/withdraw/api/create',  # 申请提现虚拟币
                        'dw/withdraw-virtual/create',  # 申请提现虚拟币
                        'dw/withdraw-virtual/{id}/place',  # 确认申请虚拟币提现（Deprecated）
                        'dw/withdraw-virtual/{id}/cancel',  # 申请取消提现虚拟币
                        'dw/transfer-in/margin',  # 现货账户划入至借贷账户
                        'dw/transfer-out/margin',  # 借贷账户划出至现货账户
                        'margin/orders',  # 申请借贷
                        'margin/orders/{id}/repay',  # 归还借贷
                        'cross-margin/transfer-in',  # 资产划转
                        'cross-margin/transfer-out',  # 资产划转
                        'cross-margin/orders',  # 申请借币
                        'cross-margin/orders/{id}/repay',  # 归还借币
                        'stable-coin/exchange',
                        'subuser/transfer',
                    ],
                },
            },
            'fees': {
                'trading': {
                    'tierBased': False,
                    'percentage': True,
                    'maker': 0.002,
                    'taker': 0.002,
                },
            },
            'exceptions': {
                'exact': {
                    # err-code
                    'bad-request': BadRequest,
                    'base-date-limit-error': BadRequest,  # {"status":"error","err-code":"base-date-limit-error","err-msg":"date less than system limit","data":null}
                    'api-not-support-temp-addr': PermissionDenied,  # {"status":"error","err-code":"api-not-support-temp-addr","err-msg":"API withdrawal does not support temporary addresses","data":null}
                    'timeout': RequestTimeout,  # {"ts":1571653730865,"status":"error","err-code":"timeout","err-msg":"Request Timeout"}
                    'gateway-internal-error': ExchangeNotAvailable,  # {"status":"error","err-code":"gateway-internal-error","err-msg":"Failed to load data. Try again later.","data":null}
                    'account-frozen-balance-insufficient-error': InsufficientFunds,  # {"status":"error","err-code":"account-frozen-balance-insufficient-error","err-msg":"trade account balance is not enough, left: `0.0027`","data":null}
                    'invalid-amount': InvalidOrder,  # eg "Paramemter `amount` is invalid."
                    'order-limitorder-amount-min-error': InvalidOrder,  # limit order amount error, min: `0.001`
                    'order-limitorder-amount-max-error': InvalidOrder,  # market order amount error, max: `1000000`
                    'order-marketorder-amount-min-error': InvalidOrder,  # market order amount error, min: `0.01`
                    'order-limitorder-price-min-error': InvalidOrder,  # limit order price error
                    'order-limitorder-price-max-error': InvalidOrder,  # limit order price error
                    'order-holding-limit-failed': InvalidOrder,  # {"status":"error","err-code":"order-holding-limit-failed","err-msg":"Order failed, exceeded the holding limit of self currency","data":null}
                    'order-orderprice-precision-error': InvalidOrder,  # {"status":"error","err-code":"order-orderprice-precision-error","err-msg":"order price precision error, scale: `4`","data":null}
                    'order-orderstate-error': OrderNotFound,  # canceling an already canceled order
                    'order-queryorder-invalid': OrderNotFound,  # querying a non-existent order
                    'order-update-error': ExchangeNotAvailable,  # undocumented error
                    'api-signature-check-failed': AuthenticationError,
                    'api-signature-not-valid': AuthenticationError,  # {"status":"error","err-code":"api-signature-not-valid","err-msg":"Signature not valid: Incorrect Access key [Access key错误]","data":null}
                    'base-record-invalid': OrderNotFound,  # https://github.com/ccxt/ccxt/issues/5750
                    'base-symbol-trade-disabled': BadSymbol,  # {"status":"error","err-code":"base-symbol-trade-disabled","err-msg":"Trading is disabled for self symbol","data":null}
                    'base-symbol-error': BadSymbol,  # {"status":"error","err-code":"base-symbol-error","err-msg":"The symbol is invalid","data":null}
                    'system-maintenance': OnMaintenance,  # {"status": "error", "err-code": "system-maintenance", "err-msg": "System is in maintenance!", "data": null}
                    # err-msg
                    'invalid symbol': BadSymbol,  # {"ts":1568813334794,"status":"error","err-code":"invalid-parameter","err-msg":"invalid symbol"}
                    'symbol trade not open now': BadSymbol,  # {"ts":1576210479343,"status":"error","err-code":"invalid-parameter","err-msg":"symbol trade not open now"}
                },
            },
            'options': {
                # https://github.com/ccxt/ccxt/issues/5376
                'fetchOrdersByStatesMethod': 'private_get_order_orders',  # 'private_get_order_history'  # https://github.com/ccxt/ccxt/pull/5392
                'fetchOpenOrdersMethod': 'fetch_open_orders_v1',  # 'fetch_open_orders_v2'  # https://github.com/ccxt/ccxt/issues/5388
                'createMarketBuyOrderRequiresPrice': True,
                'fetchMarketsMethod': 'publicGetCommonSymbols',
                'fetchBalanceMethod': 'privateGetAccountAccountsIdBalance',
                'createOrderMethod': 'privatePostOrderOrdersPlace',
                'language': 'en-US',
            },
            'commonCurrencies': {
                # https://github.com/ccxt/ccxt/issues/6081
                # https://github.com/ccxt/ccxt/issues/3365
                # https://github.com/ccxt/ccxt/issues/2873
                'GET': 'Themis',  # conflict with GET(Guaranteed Entrance Token, GET Protocol)
                'HOT': 'Hydro Protocol',  # conflict with HOT(Holo) https://github.com/ccxt/ccxt/issues/4929
                # https://github.com/ccxt/ccxt/issues/7399
                # https://coinmarketcap.com/currencies/pnetwork/
                # https://coinmarketcap.com/currencies/penta/markets/
                # https://en.cryptonomist.ch/blog/eidoo/the-edo-to-pnt-upgrade-what-you-need-to-know-updated/
                'PNT': 'Penta',
                'SBTC': 'Super Bitcoin',
            },
        })

    async def fetch_trading_limits(self, symbols=None, params={}):
        # self method should not be called directly, use loadTradingLimits() instead
        #  by default it will try load withdrawal fees of all currencies(with separate requests)
        #  however if you define symbols = ['ETH/BTC', 'LTC/BTC'] in args it will only load those
        await self.load_markets()
        if symbols is None:
            symbols = self.symbols
        result = {}
        for i in range(0, len(symbols)):
            symbol = symbols[i]
            result[symbol] = await self.fetch_trading_limits_by_id(self.market_id(symbol), params)
        return result

    async def fetch_trading_limits_by_id(self, id, params={}):
        request = {
            'symbol': id,
        }
        response = await self.publicGetCommonExchange(self.extend(request, params))
        #
        #     {status:   "ok",
        #         data: {                                 symbol: "aidocbtc",
        #                              'buy-limit-must-less-than':  1.1,
        #                          'sell-limit-must-greater-than':  0.9,
        #                         'limit-order-must-greater-than':  1,
        #                            'limit-order-must-less-than':  5000000,
        #                    'market-buy-order-must-greater-than':  0.0001,
        #                       'market-buy-order-must-less-than':  100,
        #                   'market-sell-order-must-greater-than':  1,
        #                      'market-sell-order-must-less-than':  500000,
        #                       'circuit-break-when-greater-than':  10000,
        #                          'circuit-break-when-less-than':  10,
        #                 'market-sell-order-rate-must-less-than':  0.1,
        #                  'market-buy-order-rate-must-less-than':  0.1        }}
        #
        return self.parse_trading_limits(self.safe_value(response, 'data', {}))

    def parse_trading_limits(self, limits, symbol=None, params={}):
        #
        #   {                                 symbol: "aidocbtc",
        #                  'buy-limit-must-less-than':  1.1,
        #              'sell-limit-must-greater-than':  0.9,
        #             'limit-order-must-greater-than':  1,
        #                'limit-order-must-less-than':  5000000,
        #        'market-buy-order-must-greater-than':  0.0001,
        #           'market-buy-order-must-less-than':  100,
        #       'market-sell-order-must-greater-than':  1,
        #          'market-sell-order-must-less-than':  500000,
        #           'circuit-break-when-greater-than':  10000,
        #              'circuit-break-when-less-than':  10,
        #     'market-sell-order-rate-must-less-than':  0.1,
        #      'market-buy-order-rate-must-less-than':  0.1        }
        #
        return {
            'info': limits,
            'limits': {
                'amount': {
                    'min': self.safe_float(limits, 'limit-order-must-greater-than'),
                    'max': self.safe_float(limits, 'limit-order-must-less-than'),
                },
            },
        }

    def cost_to_precision(self, symbol, cost):
        return self.decimal_to_precision(cost, TRUNCATE, self.markets[symbol]['precision']['cost'], self.precisionMode)

    async def fetch_markets(self, params={}):
        method = self.options['fetchMarketsMethod']
        response = await getattr(self, method)(params)
        markets = self.safe_value(response, 'data')
        numMarkets = len(markets)
        if numMarkets < 1:
            raise NetworkError(self.id + ' publicGetCommonSymbols returned empty response: ' + self.json(markets))
        result = []
        for i in range(0, len(markets)):
            market = markets[i]
            baseId = self.safe_string(market, 'base-currency')
            quoteId = self.safe_string(market, 'quote-currency')
            id = baseId + quoteId
            base = self.safe_currency_code(baseId)
            quote = self.safe_currency_code(quoteId)
            symbol = base + '/' + quote
            precision = {
                'amount': self.safe_integer(market, 'amount-precision'),
                'price': self.safe_integer(market, 'price-precision'),
                'cost': self.safe_integer(market, 'value-precision'),
            }
            maker = 0 if (base == 'OMG') else 0.2 / 100
            taker = 0 if (base == 'OMG') else 0.2 / 100
            minAmount = self.safe_float(market, 'min-order-amt', math.pow(10, -precision['amount']))
            maxAmount = self.safe_float(market, 'max-order-amt')
            minCost = self.safe_float(market, 'min-order-value', 0)
            state = self.safe_string(market, 'state')
            active = (state == 'online')
            result.append({
                'id': id,
                'symbol': symbol,
                'base': base,
                'quote': quote,
                'baseId': baseId,
                'quoteId': quoteId,
                'active': active,
                'precision': precision,
                'taker': taker,
                'maker': maker,
                'limits': {
                    'amount': {
                        'min': minAmount,
                        'max': maxAmount,
                    },
                    'price': {
                        'min': math.pow(10, -precision['price']),
                        'max': None,
                    },
                    'cost': {
                        'min': minCost,
                        'max': None,
                    },
                },
                'info': market,
            })
        return result

    def parse_ticker(self, ticker, market=None):
        #
        # fetchTicker
        #
        #     {
        #         "amount": 26228.672978342216,
        #         "open": 9078.95,
        #         "close": 9146.86,
        #         "high": 9155.41,
        #         "id": 209988544334,
        #         "count": 265846,
        #         "low": 8988.0,
        #         "version": 209988544334,
        #         "ask": [9146.87, 0.156134],
        #         "vol": 2.3822168242201668E8,
        #         "bid": [9146.86, 0.080758],
        #     }
        #
        # fetchTickers
        #     {
        #         symbol: "bhdht",
        #         open:  2.3938,
        #         high:  2.4151,
        #         low:  2.3323,
        #         close:  2.3909,
        #         amount:  628.992,
        #         vol:  1493.71841095,
        #         count:  2088,
        #         bid:  2.3643,
        #         bidSize:  0.7136,
        #         ask:  2.4061,
        #         askSize:  0.4156
        #     }
        #
        symbol = None
        if market is not None:
            symbol = market['symbol']
        timestamp = self.safe_integer(ticker, 'ts')
        bid = None
        bidVolume = None
        ask = None
        askVolume = None
        if 'bid' in ticker:
            if isinstance(ticker['bid'], list):
                bid = self.safe_float(ticker['bid'], 0)
                bidVolume = self.safe_float(ticker['bid'], 1)
            else:
                bid = self.safe_float(ticker, 'bid')
                bidVolume = self.safe_value(ticker, 'bidSize')
        if 'ask' in ticker:
            if isinstance(ticker['ask'], list):
                ask = self.safe_float(ticker['ask'], 0)
                askVolume = self.safe_float(ticker['ask'], 1)
            else:
                ask = self.safe_float(ticker, 'ask')
                askVolume = self.safe_value(ticker, 'askSize')
        open = self.safe_float(ticker, 'open')
        close = self.safe_float(ticker, 'close')
        change = None
        percentage = None
        average = None
        if (open is not None) and (close is not None):
            change = close - open
            average = self.sum(open, close) / 2
            if (close is not None) and (close > 0):
                percentage = (change / open) * 100
        baseVolume = self.safe_float(ticker, 'amount')
        quoteVolume = self.safe_float(ticker, 'vol')
        vwap = self.vwap(baseVolume, quoteVolume)
        return {
            'symbol': symbol,
            'timestamp': timestamp,
            'datetime': self.iso8601(timestamp),
            'high': self.safe_float(ticker, 'high'),
            'low': self.safe_float(ticker, 'low'),
            'bid': bid,
            'bidVolume': bidVolume,
            'ask': ask,
            'askVolume': askVolume,
            'vwap': vwap,
            'open': open,
            'close': close,
            'last': close,
            'previousClose': None,
            'change': change,
            'percentage': percentage,
            'average': average,
            'baseVolume': baseVolume,
            'quoteVolume': quoteVolume,
            'info': ticker,
        }

    async def fetch_order_book(self, symbol, limit=None, params={}):
        await self.load_markets()
        market = self.market(symbol)
        request = {
            'symbol': market['id'],
            'type': 'step0',
        }
        response = await self.marketGetDepth(self.extend(request, params))
        #
        #     {
        #         "status": "ok",
        #         "ch": "market.btcusdt.depth.step0",
        #         "ts": 1583474832790,
        #         "tick": {
        #             "bids": [
        #                 [9100.290000000000000000, 0.200000000000000000],
        #                 [9099.820000000000000000, 0.200000000000000000],
        #                 [9099.610000000000000000, 0.205000000000000000],
        #             ],
        #             "asks": [
        #                 [9100.640000000000000000, 0.005904000000000000],
        #                 [9101.010000000000000000, 0.287311000000000000],
        #                 [9101.030000000000000000, 0.012121000000000000],
        #             ],
        #             "ts":1583474832008,
        #             "version":104999698780
        #         }
        #     }
        #
        if 'tick' in response:
            if not response['tick']:
                raise BadSymbol(self.id + ' fetchOrderBook() returned empty response: ' + self.json(response))
            tick = self.safe_value(response, 'tick')
            timestamp = self.safe_integer(tick, 'ts', self.safe_integer(response, 'ts'))
            result = self.parse_order_book(tick, timestamp)
            result['nonce'] = self.safe_integer(tick, 'version')
            return result
        raise ExchangeError(self.id + ' fetchOrderBook() returned unrecognized response: ' + self.json(response))

    async def fetch_ticker(self, symbol, params={}):
        await self.load_markets()
        market = self.market(symbol)
        request = {
            'symbol': market['id'],
        }
        response = await self.marketGetDetailMerged(self.extend(request, params))
        #
        #     {
        #         "status": "ok",
        #         "ch": "market.btcusdt.detail.merged",
        #         "ts": 1583494336669,
        #         "tick": {
        #             "amount": 26228.672978342216,
        #             "open": 9078.95,
        #             "close": 9146.86,
        #             "high": 9155.41,
        #             "id": 209988544334,
        #             "count": 265846,
        #             "low": 8988.0,
        #             "version": 209988544334,
        #             "ask": [9146.87, 0.156134],
        #             "vol": 2.3822168242201668E8,
        #             "bid": [9146.86, 0.080758],
        #         }
        #     }
        #
        ticker = self.parse_ticker(response['tick'], market)
        timestamp = self.safe_value(response, 'ts')
        ticker['timestamp'] = timestamp
        ticker['datetime'] = self.iso8601(timestamp)
        return ticker

    async def fetch_tickers(self, symbols=None, params={}):
        await self.load_markets()
        response = await self.marketGetTickers(params)
        tickers = self.safe_value(response, 'data')
        timestamp = self.safe_integer(response, 'ts')
        result = {}
        for i in range(0, len(tickers)):
            marketId = self.safe_string(tickers[i], 'symbol')
            market = self.safe_market(marketId)
            symbol = market['symbol']
            ticker = self.parse_ticker(tickers[i], market)
            ticker['timestamp'] = timestamp
            ticker['datetime'] = self.iso8601(timestamp)
            result[symbol] = ticker
        return self.filter_by_array(result, 'symbol', symbols)

    def parse_trade(self, trade, market=None):
        #
        # fetchTrades(public)
        #
        #     {
        #         "amount": 0.010411000000000000,
        #         "trade-id": 102090736910,
        #         "ts": 1583497692182,
        #         "id": 10500517034273194594947,
        #         "price": 9096.050000000000000000,
        #         "direction": "sell"
        #     }
        #
        # fetchMyTrades(private)
        #
        #     {
        #          'symbol': 'swftcbtc',
        #          'fee-currency': 'swftc',
        #          'filled-fees': '0',
        #          'source': 'spot-api',
        #          'id': 83789509854000,
        #          'type': 'buy-limit',
        #          'order-id': 83711103204909,
        #          'filled-points': '0.005826843283532154',
        #          'fee-deduct-currency': 'ht',
        #          'filled-amount': '45941.53',
        #          'price': '0.0000001401',
        #          'created-at': 1597933260729,
        #          'match-id': 100087455560,
        #          'role': 'maker',
        #          'trade-id': 100050305348
        #     },
        #
        marketId = self.safe_string(trade, 'symbol')
        symbol = self.safe_symbol(marketId, market)
        timestamp = self.safe_integer_2(trade, 'ts', 'created-at')
        order = self.safe_string(trade, 'order-id')
        side = self.safe_string(trade, 'direction')
        type = self.safe_string(trade, 'type')
        if type is not None:
            typeParts = type.split('-')
            side = typeParts[0]
            type = typeParts[1]
        takerOrMaker = self.safe_string(trade, 'role')
        price = self.safe_float(trade, 'price')
        amount = self.safe_float_2(trade, 'filled-amount', 'amount')
        cost = None
        if price is not None:
            if amount is not None:
                cost = amount * price
        fee = None
        feeCost = self.safe_float(trade, 'filled-fees')
        feeCurrency = None
        if market is not None:
            feeCurrency = self.safe_currency_code(self.safe_string(trade, 'fee-currency'))
        filledPoints = self.safe_float(trade, 'filled-points')
        if filledPoints is not None:
            if (feeCost is None) or (feeCost == 0.0):
                feeCost = filledPoints
                feeCurrency = self.safe_currency_code(self.safe_string(trade, 'fee-deduct-currency'))
        if feeCost is not None:
            fee = {
                'cost': feeCost,
                'currency': feeCurrency,
            }
        tradeId = self.safe_string_2(trade, 'trade-id', 'tradeId')
        id = self.safe_string(trade, 'id', tradeId)
        return {
            'id': id,
            'info': trade,
            'order': order,
            'timestamp': timestamp,
            'datetime': self.iso8601(timestamp),
            'symbol': symbol,
            'type': type,
            'side': side,
            'takerOrMaker': takerOrMaker,
            'price': price,
            'amount': amount,
            'cost': cost,
            'fee': fee,
        }

    async def fetch_my_trades(self, symbol=None, since=None, limit=None, params={}):
        await self.load_markets()
        market = None
        request = {}
        if symbol is not None:
            market = self.market(symbol)
            request['symbol'] = market['id']
        if limit is not None:
            request['size'] = limit  # 1-100 orders, default is 100
        if since is not None:
            request['start-date'] = self.ymd(since)  # a date within 61 days from today
            request['end-date'] = self.ymd(self.sum(since, 86400000))
        response = await self.privateGetOrderMatchresults(self.extend(request, params))
        trades = self.parse_trades(response['data'], market, since, limit)
        return trades

    async def fetch_trades(self, symbol, since=None, limit=1000, params={}):
        await self.load_markets()
        market = self.market(symbol)
        request = {
            'symbol': market['id'],
        }
        if limit is not None:
            request['size'] = limit
        response = await self.marketGetHistoryTrade(self.extend(request, params))
        #
        #     {
        #         "status": "ok",
        #         "ch": "market.btcusdt.trade.detail",
        #         "ts": 1583497692365,
        #         "data": [
        #             {
        #                 "id": 105005170342,
        #                 "ts": 1583497692182,
        #                 "data": [
        #                     {
        #                         "amount": 0.010411000000000000,
        #                         "trade-id": 102090736910,
        #                         "ts": 1583497692182,
        #                         "id": 10500517034273194594947,
        #                         "price": 9096.050000000000000000,
        #                         "direction": "sell"
        #                     }
        #                 ]
        #             },
        #             # ...
        #         ]
        #     }
        #
        data = self.safe_value(response, 'data')
        result = []
        for i in range(0, len(data)):
            trades = self.safe_value(data[i], 'data', [])
            for j in range(0, len(trades)):
                trade = self.parse_trade(trades[j], market)
                result.append(trade)
        result = self.sort_by(result, 'timestamp')
        return self.filter_by_symbol_since_limit(result, symbol, since, limit)

    def parse_ohlcv(self, ohlcv, market=None):
        #
        #     {
        #         "amount":1.2082,
        #         "open":0.025096,
        #         "close":0.025095,
        #         "high":0.025096,
        #         "id":1591515300,
        #         "count":6,
        #         "low":0.025095,
        #         "vol":0.0303205097
        #     }
        #
        return [
            self.safe_timestamp(ohlcv, 'id'),
            self.safe_float(ohlcv, 'open'),
            self.safe_float(ohlcv, 'high'),
            self.safe_float(ohlcv, 'low'),
            self.safe_float(ohlcv, 'close'),
            self.safe_float(ohlcv, 'amount'),
        ]

    async def fetch_ohlcv(self, symbol, timeframe='1m', since=None, limit=1000, params={}):
        await self.load_markets()
        market = self.market(symbol)
        request = {
            'symbol': market['id'],
            'period': self.timeframes[timeframe],
        }
        if limit is not None:
            request['size'] = limit
        response = await self.marketGetHistoryKline(self.extend(request, params))
        #
        #     {
        #         "status":"ok",
        #         "ch":"market.ethbtc.kline.1min",
        #         "ts":1591515374371,
        #         "data":[
        #             {"amount":0.0,"open":0.025095,"close":0.025095,"high":0.025095,"id":1591515360,"count":0,"low":0.025095,"vol":0.0},
        #             {"amount":1.2082,"open":0.025096,"close":0.025095,"high":0.025096,"id":1591515300,"count":6,"low":0.025095,"vol":0.0303205097},
        #             {"amount":0.0648,"open":0.025096,"close":0.025096,"high":0.025096,"id":1591515240,"count":2,"low":0.025096,"vol":0.0016262208},
        #         ]
        #     }
        #
        data = self.safe_value(response, 'data', [])
        return self.parse_ohlcvs(data, market, timeframe, since, limit)

    async def fetch_accounts(self, params={}):
        await self.load_markets()
        response = await self.privateGetAccountAccounts(params)
        return response['data']

    async def fetch_currencies(self, params={}):
        request = {
            'language': self.options['language'],
        }
        response = await self.publicGetSettingsCurrencys(self.extend(request, params))
        currencies = self.safe_value(response, 'data')
        result = {}
        for i in range(0, len(currencies)):
            currency = currencies[i]
            #
            #  {                    name: "ctxc",
            #              'display-name': "CTXC",
            #        'withdraw-precision':  8,
            #             'currency-type': "eth",
            #        'currency-partition': "pro",
            #             'support-sites':  null,
            #                'otc-enable':  0,
            #        'deposit-min-amount': "2",
            #       'withdraw-min-amount': "4",
            #            'show-precision': "8",
            #                      weight: "2988",
            #                     visible:  True,
            #              'deposit-desc': "Please don’t deposit any other digital assets except CTXC t…",
            #             'withdraw-desc': "Minimum withdrawal amount: 4 CTXC. not >_<not For security reason…",
            #           'deposit-enabled':  True,
            #          'withdraw-enabled':  True,
            #    'currency-addr-with-tag':  False,
            #             'fast-confirms':  15,
            #             'safe-confirms':  30                                                             }
            #
            id = self.safe_value(currency, 'name')
            precision = self.safe_integer(currency, 'withdraw-precision')
            code = self.safe_currency_code(id)
            active = currency['visible'] and currency['deposit-enabled'] and currency['withdraw-enabled']
            name = self.safe_string(currency, 'display-name')
            result[code] = {
                'id': id,
                'code': code,
                'type': 'crypto',
                # 'payin': currency['deposit-enabled'],
                # 'payout': currency['withdraw-enabled'],
                # 'transfer': None,
                'name': name,
                'active': active,
                'fee': None,  # todo need to fetch from fee endpoint
                'precision': precision,
                'limits': {
                    'amount': {
                        'min': math.pow(10, -precision),
                        'max': math.pow(10, precision),
                    },
                    'price': {
                        'min': math.pow(10, -precision),
                        'max': math.pow(10, precision),
                    },
                    'cost': {
                        'min': None,
                        'max': None,
                    },
                    'deposit': {
                        'min': self.safe_float(currency, 'deposit-min-amount'),
                        'max': math.pow(10, precision),
                    },
                    'withdraw': {
                        'min': self.safe_float(currency, 'withdraw-min-amount'),
                        'max': math.pow(10, precision),
                    },
                },
                'info': currency,
            }
        return result

    async def fetch_balance(self, params={}):
        await self.load_markets()
        await self.load_accounts()
        method = self.options['fetchBalanceMethod']
        request = {
            'id': self.accounts[0]['id'],
        }
        response = await getattr(self, method)(self.extend(request, params))
        balances = self.safe_value(response['data'], 'list', [])
        result = {'info': response}
        for i in range(0, len(balances)):
            balance = balances[i]
            currencyId = self.safe_string(balance, 'currency')
            code = self.safe_currency_code(currencyId)
            account = None
            if code in result:
                account = result[code]
            else:
                account = self.account()
            if balance['type'] == 'trade':
                account['free'] = self.safe_float(balance, 'balance')
            if balance['type'] == 'frozen':
                account['used'] = self.safe_float(balance, 'balance')
            result[code] = account
        return self.parse_balance(result)

    async def fetch_orders_by_states(self, states, symbol=None, since=None, limit=None, params={}):
        await self.load_markets()
        request = {
            'states': states,
        }
        market = None
        if symbol is not None:
            market = self.market(symbol)
            request['symbol'] = market['id']
        method = self.safe_string(self.options, 'fetchOrdersByStatesMethod', 'private_get_order_orders')
        response = await getattr(self, method)(self.extend(request, params))
        #
        #     {status:   "ok",
        #         data: [{                 id:  13997833014,
        #                                symbol: "ethbtc",
        #                          'account-id':  3398321,
        #                                amount: "0.045000000000000000",
        #                                 price: "0.034014000000000000",
        #                          'created-at':  1545836976871,
        #                                  type: "sell-limit",
        #                        'field-amount': "0.045000000000000000",
        #                   'field-cash-amount': "0.001530630000000000",
        #                          'field-fees': "0.000003061260000000",
        #                         'finished-at':  1545837948214,
        #                                source: "spot-api",
        #                                 state: "filled",
        #                         'canceled-at':  0                      }  ]}
        #
        return self.parse_orders(response['data'], market, since, limit)

    async def fetch_order(self, id, symbol=None, params={}):
        await self.load_markets()
        request = {
            'id': id,
        }
        response = await self.privateGetOrderOrdersId(self.extend(request, params))
        order = self.safe_value(response, 'data')
        return self.parse_order(order)

    async def fetch_orders(self, symbol=None, since=None, limit=None, params={}):
        return await self.fetch_orders_by_states('pre-submitted,submitted,partial-filled,filled,partial-canceled,canceled', symbol, since, limit, params)

    async def fetch_open_orders(self, symbol=None, since=None, limit=None, params={}):
        method = self.safe_string(self.options, 'fetchOpenOrdersMethod', 'fetch_open_orders_v1')
        return await getattr(self, method)(symbol, since, limit, params)

    async def fetch_open_orders_v1(self, symbol=None, since=None, limit=None, params={}):
        if symbol is None:
            raise ArgumentsRequired(self.id + ' fetchOpenOrdersV1() requires a symbol argument')
        return await self.fetch_orders_by_states('pre-submitted,submitted,partial-filled', symbol, since, limit, params)

    async def fetch_closed_orders(self, symbol=None, since=None, limit=None, params={}):
        return await self.fetch_orders_by_states('filled,partial-canceled,canceled', symbol, since, limit, params)

    async def fetch_open_orders_v2(self, symbol=None, since=None, limit=None, params={}):
        await self.load_markets()
        if symbol is None:
            raise ArgumentsRequired(self.id + ' fetchOpenOrders() requires a symbol argument')
        market = self.market(symbol)
        accountId = self.safe_string(params, 'account-id')
        if accountId is None:
            # pick the first account
            await self.load_accounts()
            for i in range(0, len(self.accounts)):
                account = self.accounts[i]
                if account['type'] == 'spot':
                    accountId = self.safe_string(account, 'id')
                    if accountId is not None:
                        break
        request = {
            'symbol': market['id'],
            'account-id': accountId,
        }
        if limit is not None:
            request['size'] = limit
        omitted = self.omit(params, 'account-id')
        response = await self.privateGetOrderOpenOrders(self.extend(request, omitted))
        #
        #     {
        #         "status":"ok",
        #         "data":[
        #             {
        #                 "symbol":"ethusdt",
        #                 "source":"api",
        #                 "amount":"0.010000000000000000",
        #                 "account-id":1528640,
        #                 "created-at":1561597491963,
        #                 "price":"400.000000000000000000",
        #                 "filled-amount":"0.0",
        #                 "filled-cash-amount":"0.0",
        #                 "filled-fees":"0.0",
        #                 "id":38477101630,
        #                 "state":"submitted",
        #                 "type":"sell-limit"
        #             }
        #         ]
        #     }
        #
        data = self.safe_value(response, 'data', [])
        return self.parse_orders(data, market, since, limit)

    def parse_order_status(self, status):
        statuses = {
            'partial-filled': 'open',
            'partial-canceled': 'canceled',
            'filled': 'closed',
            'canceled': 'canceled',
            'submitted': 'open',
        }
        return self.safe_string(statuses, status, status)

    def parse_order(self, order, market=None):
        #
        #     {                 id:  13997833014,
        #                    symbol: "ethbtc",
        #              'account-id':  3398321,
        #                    amount: "0.045000000000000000",
        #                     price: "0.034014000000000000",
        #              'created-at':  1545836976871,
        #                      type: "sell-limit",
        #            'field-amount': "0.045000000000000000",  # they have fixed it for filled-amount
        #       'field-cash-amount': "0.001530630000000000",  # they have fixed it for filled-cash-amount
        #              'field-fees': "0.000003061260000000",  # they have fixed it for filled-fees
        #             'finished-at':  1545837948214,
        #                    source: "spot-api",
        #                     state: "filled",
        #             'canceled-at':  0                      }
        #
        #     {                 id:  20395337822,
        #                    symbol: "ethbtc",
        #              'account-id':  5685075,
        #                    amount: "0.001000000000000000",
        #                     price: "0.0",
        #              'created-at':  1545831584023,
        #                      type: "buy-market",
        #            'field-amount': "0.029100000000000000",  # they have fixed it for filled-amount
        #       'field-cash-amount': "0.000999788700000000",  # they have fixed it for filled-cash-amount
        #              'field-fees': "0.000058200000000000",  # they have fixed it for filled-fees
        #             'finished-at':  1545831584181,
        #                    source: "spot-api",
        #                     state: "filled",
        #             'canceled-at':  0                      }
        #
        id = self.safe_string(order, 'id')
        side = None
        type = None
        status = None
        if 'type' in order:
            orderType = order['type'].split('-')
            side = orderType[0]
            type = orderType[1]
            status = self.parse_order_status(self.safe_string(order, 'state'))
        marketId = self.safe_string(order, 'symbol')
        symbol = self.safe_symbol(marketId, market)
        timestamp = self.safe_integer(order, 'created-at')
        amount = self.safe_float(order, 'amount')
        filled = self.safe_float_2(order, 'filled-amount', 'field-amount')  # typo in their API, filled amount
        if (type == 'market') and (side == 'buy'):
            amount = filled if (status == 'closed') else None
        price = self.safe_float(order, 'price')
        if price == 0.0:
            price = None
        cost = self.safe_float_2(order, 'filled-cash-amount', 'field-cash-amount')  # same typo
        remaining = None
        average = None
        if filled is not None:
            if amount is not None:
                remaining = amount - filled
            # if cost is defined and filled is not zero
            if (cost is not None) and (filled > 0):
                average = cost / filled
        feeCost = self.safe_float_2(order, 'filled-fees', 'field-fees')  # typo in their API, filled fees
        fee = None
        if feeCost is not None:
            feeCurrency = None
            if market is not None:
                feeCurrency = market['quote'] if (side == 'sell') else market['base']
            fee = {
                'cost': feeCost,
                'currency': feeCurrency,
            }
        return {
            'info': order,
            'id': id,
            'clientOrderId': None,
            'timestamp': timestamp,
            'datetime': self.iso8601(timestamp),
            'lastTradeTimestamp': None,
            'symbol': symbol,
            'type': type,
            'timeInForce': None,
            'postOnly': None,
            'side': side,
            'price': price,
            'stopPrice': None,
            'average': average,
            'cost': cost,
            'amount': amount,
            'filled': filled,
            'remaining': remaining,
            'status': status,
            'fee': fee,
            'trades': None,
        }

    async def create_order(self, symbol, type, side, amount, price=None, params={}):
        await self.load_markets()
        await self.load_accounts()
        market = self.market(symbol)
        request = {
            'account-id': self.accounts[0]['id'],
            'symbol': market['id'],
            'type': side + '-' + type,
        }
        if (type == 'market') and (side == 'buy'):
            if self.options['createMarketBuyOrderRequiresPrice']:
                if price is None:
                    raise InvalidOrder(self.id + " market buy order requires price argument to calculate cost(total amount of quote currency to spend for buying, amount * price). To switch off self warning exception and specify cost in the amount argument, set .options['createMarketBuyOrderRequiresPrice'] = False. Make sure you know what you're doing.")
                else:
                    # despite that cost = amount * price is in quote currency and should have quote precision
                    # the exchange API requires the cost supplied in 'amount' to be of base precision
                    # more about it here:
                    # https://github.com/ccxt/ccxt/pull/4395
                    # https://github.com/ccxt/ccxt/issues/7611
                    # we use amountToPrecision here because the exchange requires cost in base precision
                    request['amount'] = self.cost_to_precision(symbol, float(amount) * float(price))
            else:
                request['amount'] = self.cost_to_precision(symbol, amount)
        else:
            request['amount'] = self.amount_to_precision(symbol, amount)
        if type == 'limit' or type == 'ioc' or type == 'limit-maker':
            request['price'] = self.price_to_precision(symbol, price)
        method = self.options['createOrderMethod']
        response = await getattr(self, method)(self.extend(request, params))
        timestamp = self.milliseconds()
        id = self.safe_string(response, 'data')
        return {
            'info': response,
            'id': id,
            'timestamp': timestamp,
            'datetime': self.iso8601(timestamp),
            'lastTradeTimestamp': None,
            'status': None,
            'symbol': symbol,
            'type': type,
            'side': side,
            'price': price,
            'amount': amount,
            'filled': None,
            'remaining': None,
            'cost': None,
            'trades': None,
            'fee': None,
            'clientOrderId': None,
            'average': None,
        }

    async def cancel_order(self, id, symbol=None, params={}):
        response = await self.privatePostOrderOrdersIdSubmitcancel({'id': id})
        #
        #     response = {
        #         'status': 'ok',
        #         'data': '10138899000',
        #     }
        #
        return self.extend(self.parse_order(response), {
            'id': id,
            'status': 'canceled',
        })

    def currency_to_precision(self, currency, fee):
        return self.decimal_to_precision(fee, 0, self.currencies[currency]['precision'])

    def calculate_fee(self, symbol, type, side, amount, price, takerOrMaker='taker', params={}):
        market = self.markets[symbol]
        rate = market[takerOrMaker]
        cost = amount * rate
        key = 'quote'
        if side == 'sell':
            cost *= price
        else:
            key = 'base'
        return {
            'type': takerOrMaker,
            'currency': market[key],
            'rate': rate,
            'cost': float(self.currency_to_precision(market[key], cost)),
        }

    def parse_deposit_address(self, depositAddress, currency=None):
        #
        #     {
        #         currency: "eth",
        #         address: "0xf7292eb9ba7bc50358e27f0e025a4d225a64127b",
        #         addressTag: "",
        #         chain: "eth"
        #     }
        #
        address = self.safe_string(depositAddress, 'address')
        tag = self.safe_string(depositAddress, 'addressTag')
        currencyId = self.safe_string(depositAddress, 'currency')
        code = self.safe_currency_code(currencyId)
        self.check_address(address)
        return {
            'currency': code,
            'address': address,
            'tag': tag,
            'info': depositAddress,
        }

    async def fetch_deposit_address(self, code, params={}):
        await self.load_markets()
        currency = self.currency(code)
        request = {
            'currency': currency['id'],
        }
        response = await self.v2PrivateGetAccountDepositAddress(self.extend(request, params))
        #
        #     {
        #         code: 200,
        #         data: [
        #             {
        #                 currency: "eth",
        #                 address: "0xf7292eb9ba7bc50358e27f0e025a4d225a64127b",
        #                 addressTag: "",
        #                 chain: "eth"
        #             }
        #         ]
        #     }
        #
        data = self.safe_value(response, 'data', [])
        return self.parse_deposit_address(self.safe_value(data, 0, {}), currency)

    async def fetch_deposits(self, code=None, since=None, limit=None, params={}):
        if limit is None or limit > 100:
            limit = 100
        await self.load_markets()
        currency = None
        if code is not None:
            currency = self.currency(code)
        request = {
            'type': 'deposit',
            'from': 0,  # From 'id' ... if you want to get results after a particular transaction id, pass the id in params.from
        }
        if currency is not None:
            request['currency'] = currency['id']
        if limit is not None:
            request['size'] = limit  # max 100
        response = await self.privateGetQueryDepositWithdraw(self.extend(request, params))
        # return response
        return self.parse_transactions(response['data'], currency, since, limit)

    async def fetch_withdrawals(self, code=None, since=None, limit=None, params={}):
        if limit is None or limit > 100:
            limit = 100
        await self.load_markets()
        currency = None
        if code is not None:
            currency = self.currency(code)
        request = {
            'type': 'withdraw',
            'from': 0,  # From 'id' ... if you want to get results after a particular transaction id, pass the id in params.from
        }
        if currency is not None:
            request['currency'] = currency['id']
        if limit is not None:
            request['size'] = limit  # max 100
        response = await self.privateGetQueryDepositWithdraw(self.extend(request, params))
        # return response
        return self.parse_transactions(response['data'], currency, since, limit)

    def parse_transaction(self, transaction, currency=None):
        #
        # fetchDeposits
        #
        #     {
        #         'id': 8211029,
        #         'type': 'deposit',
        #         'currency': 'eth',
        #         'chain': 'eth',
        #         'tx-hash': 'bd315....',
        #         'amount': 0.81162421,
        #         'address': '4b8b....',
        #         'address-tag': '',
        #         'fee': 0,
        #         'state': 'safe',
        #         'created-at': 1542180380965,
        #         'updated-at': 1542180788077
        #     }
        #
        # fetchWithdrawals
        #
        #     {
        #         'id': 6908275,
        #         'type': 'withdraw',
        #         'currency': 'btc',
        #         'chain': 'btc',
        #         'tx-hash': 'c1a1a....',
        #         'amount': 0.80257005,
        #         'address': '1QR....',
        #         'address-tag': '',
        #         'fee': 0.0005,
        #         'state': 'confirmed',
        #         'created-at': 1552107295685,
        #         'updated-at': 1552108032859
        #     }
        #
        timestamp = self.safe_integer(transaction, 'created-at')
        updated = self.safe_integer(transaction, 'updated-at')
        code = self.safe_currency_code(self.safe_string(transaction, 'currency'))
        type = self.safe_string(transaction, 'type')
        if type == 'withdraw':
            type = 'withdrawal'
        status = self.parse_transaction_status(self.safe_string(transaction, 'state'))
        tag = self.safe_string(transaction, 'address-tag')
        feeCost = self.safe_float(transaction, 'fee')
        if feeCost is not None:
            feeCost = abs(feeCost)
        return {
            'info': transaction,
            'id': self.safe_string(transaction, 'id'),
            'txid': self.safe_string(transaction, 'tx-hash'),
            'timestamp': timestamp,
            'datetime': self.iso8601(timestamp),
            'address': self.safe_string(transaction, 'address'),
            'tag': tag,
            'type': type,
            'amount': self.safe_float(transaction, 'amount'),
            'currency': code,
            'status': status,
            'updated': updated,
            'fee': {
                'currency': code,
                'cost': feeCost,
                'rate': None,
            },
        }

    def parse_transaction_status(self, status):
        statuses = {
            # deposit statuses
            'unknown': 'failed',
            'confirming': 'pending',
            'confirmed': 'ok',
            'safe': 'ok',
            'orphan': 'failed',
            # withdrawal statuses
            'submitted': 'pending',
            'canceled': 'canceled',
            'reexamine': 'pending',
            'reject': 'failed',
            'pass': 'pending',
            'wallet-reject': 'failed',
            # 'confirmed': 'ok',  # present in deposit statuses
            'confirm-error': 'failed',
            'repealed': 'failed',
            'wallet-transfer': 'pending',
            'pre-transfer': 'pending',
        }
        return self.safe_string(statuses, status, status)

    async def withdraw(self, code, amount, address, tag=None, params={}):
        await self.load_markets()
        self.check_address(address)
        currency = self.currency(code)
        request = {
            'address': address,  # only supports existing addresses in your withdraw address list
            'amount': amount,
            'currency': currency['id'].lower(),
        }
        if tag is not None:
            request['addr-tag'] = tag  # only for XRP?
        response = await self.privatePostDwWithdrawApiCreate(self.extend(request, params))
        id = self.safe_string(response, 'data')
        return {
            'info': response,
            'id': id,
        }

    def sign(self, path, api='public', method='GET', params={}, headers=None, body=None):
        url = '/'
        if api == 'market':
            url += api
        elif (api == 'public') or (api == 'private'):
            url += self.version
        elif (api == 'v2Public') or (api == 'v2Private'):
            url += 'v2'
        url += '/' + self.implode_params(path, params)
        query = self.omit(params, self.extract_params(path))
        if api == 'private' or api == 'v2Private':
            self.check_required_credentials()
            timestamp = self.ymdhms(self.milliseconds(), 'T')
            request = {
                'SignatureMethod': 'HmacSHA256',
                'SignatureVersion': '2',
                'AccessKeyId': self.apiKey,
                'Timestamp': timestamp,
            }
            if method != 'POST':
                request = self.extend(request, query)
            request = self.keysort(request)
            auth = self.urlencode(request)
            # unfortunately, PHP demands double quotes for the escaped newline symbol
            # eslint-disable-next-line quotes
            payload = "\n".join([method, self.hostname, url, auth])
            signature = self.hmac(self.encode(payload), self.encode(self.secret), hashlib.sha256, 'base64')
            auth += '&' + self.urlencode({'Signature': signature})
            url += '?' + auth
            if method == 'POST':
                body = self.json(query)
                headers = {
                    'Content-Type': 'application/json',
                }
            else:
                headers = {
                    'Content-Type': 'application/x-www-form-urlencoded',
                }
        else:
            if params:
                url += '?' + self.urlencode(params)
        url = self.implode_params(self.urls['api'][api], {
            'hostname': self.hostname,
        }) + url
        return {'url': url, 'method': method, 'body': body, 'headers': headers}

    def handle_errors(self, httpCode, reason, url, method, headers, body, response, requestHeaders, requestBody):
        if response is None:
            return  # fallback to default error handler
        if 'status' in response:
            #
            #     {"status":"error","err-code":"order-limitorder-amount-min-error","err-msg":"limit order amount error, min: `0.001`","data":null}
            #
            status = self.safe_string(response, 'status')
            if status == 'error':
                code = self.safe_string(response, 'err-code')
                feedback = self.id + ' ' + body
                self.throw_exactly_matched_exception(self.exceptions['exact'], code, feedback)
                message = self.safe_string(response, 'err-msg')
                self.throw_exactly_matched_exception(self.exceptions['exact'], message, feedback)
                raise ExchangeError(feedback)
