# -*- 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

import ccxt.async_support
from ccxt.async_support.base.ws.cache import ArrayCache, ArrayCacheBySymbolById, ArrayCacheByTimestamp
from ccxt.base.types import Any, Balances, Bool, Int, Order, OrderBook, Str, Strings, Ticker, Tickers, Trade
from ccxt.async_support.base.ws.client import Client
from typing import List
from ccxt.base.errors import ExchangeError
from ccxt.base.errors import ArgumentsRequired


class kucoin(ccxt.async_support.kucoin):

    def describe(self) -> Any:
        return self.deep_extend(super(kucoin, self).describe(), {
            'has': {
                'ws': True,
                'createOrderWs': False,
                'editOrderWs': False,
                'fetchOpenOrdersWs': False,
                'fetchOrderWs': False,
                'cancelOrderWs': False,
                'cancelOrdersWs': False,
                'cancelAllOrdersWs': False,
                'watchBidsAsks': True,
                'watchOrderBook': True,
                'watchOrders': True,
                'watchMyTrades': True,
                'watchTickers': True,
                'watchTicker': True,
                'watchTrades': True,
                'watchTradesForSymbols': True,
                'watchOrderBookForSymbols': True,
                'watchBalance': True,
                'watchOHLCV': True,
                'unWatchTicker': True,
                'unWatchOHLCV': True,
                'unWatchOrderBook': True,
                'unWatchTrades': True,
                'unWatchhTradesForSymbols': True,
            },
            'options': {
                'tradesLimit': 1000,
                'watchTicker': {
                    'name': 'market/snapshot',  # market/ticker
                },
                'watchOrderBook': {
                    'snapshotDelay': 5,
                    'snapshotMaxRetries': 3,
                    'method': '/market/level2',  # '/spotMarket/level2Depth5' or '/spotMarket/level2Depth50'
                },
                'watchMyTrades': {
                    'method': '/spotMarket/tradeOrders',  # or '/spot/tradeFills'
                },
            },
            'streaming': {
                # kucoin does not support built-in ws protocol-level ping-pong
                # instead it requires a custom json-based text ping-pong
                # https://docs.kucoin.com/#ping
                'ping': self.ping,
            },
        })

    async def negotiate(self, privateChannel, params={}):
        connectId = 'private' if privateChannel else 'public'
        urls = self.safe_value(self.options, 'urls', {})
        future = self.safe_value(urls, connectId)
        if future is not None:
            return await future
        # we store an awaitable to the url
        # so that multiple calls don't asynchronously
        # fetch different urls and overwrite each other
        urls[connectId] = self.spawn(self.negotiate_helper, privateChannel, params)
        self.options['urls'] = urls
        future = urls[connectId]
        return await future

    async def negotiate_helper(self, privateChannel, params={}):
        response = None
        connectId = 'private' if privateChannel else 'public'
        try:
            if privateChannel:
                response = await self.privatePostBulletPrivate(params)
                #
                #     {
                #         "code": "200000",
                #         "data": {
                #             "instanceServers": [
                #                 {
                #                     "pingInterval":  50000,
                #                     "endpoint": "wss://push-private.kucoin.com/endpoint",
                #                     "protocol": "websocket",
                #                     "encrypt": True,
                #                     "pingTimeout": 10000
                #                 }
                #             ],
                #             "token": "2neAiuYvAU61ZDXANAGAsiL4-iAExhsBXZxftpOeh_55i3Ysy2q2LEsEWU64mdzUOPusi34M_wGoSf7iNyEWJ1UQy47YbpY4zVdzilNP-Bj3iXzrjjGlWtiYB9J6i9GjsxUuhPw3BlrzazF6ghq4Lzf7scStOz3KkxjwpsOBCH4=.WNQmhZQeUKIkh97KYgU0Lg=="
                #         }
                #     }
                #
            else:
                response = await self.publicPostBulletPublic(params)
            data = self.safe_value(response, 'data', {})
            instanceServers = self.safe_value(data, 'instanceServers', [])
            firstInstanceServer = self.safe_value(instanceServers, 0)
            pingInterval = self.safe_integer(firstInstanceServer, 'pingInterval')
            endpoint = self.safe_string(firstInstanceServer, 'endpoint')
            token = self.safe_string(data, 'token')
            result = endpoint + '?' + self.urlencode({
                'token': token,
                'privateChannel': privateChannel,
                'connectId': connectId,
            })
            client = self.client(result)
            client.keepAlive = pingInterval
            return result
        except Exception as e:
            future = self.safe_value(self.options['urls'], connectId)
            future.reject(e)
            del self.options['urls'][connectId]
        return None

    def request_id(self):
        requestId = self.sum(self.safe_integer(self.options, 'requestId', 0), 1)
        self.options['requestId'] = requestId
        return requestId

    async def subscribe(self, url, messageHash, subscriptionHash, params={}, subscription=None):
        requestId = str(self.request_id())
        request: dict = {
            'id': requestId,
            'type': 'subscribe',
            'topic': subscriptionHash,
            'response': True,
        }
        message = self.extend(request, params)
        client = self.client(url)
        if not (subscriptionHash in client.subscriptions):
            client.subscriptions[requestId] = subscriptionHash
        return await self.watch(url, messageHash, message, subscriptionHash, subscription)

    async def un_subscribe(self, url, messageHash, topic, subscriptionHash, params={}, subscription: dict = None):
        return await self.un_subscribe_multiple(url, [messageHash], topic, [subscriptionHash], params, subscription)

    async def subscribe_multiple(self, url, messageHashes, topic, subscriptionHashes, params={}, subscription=None):
        requestId = str(self.request_id())
        request: dict = {
            'id': requestId,
            'type': 'subscribe',
            'topic': topic,
            'response': True,
        }
        message = self.extend(request, params)
        client = self.client(url)
        for i in range(0, len(subscriptionHashes)):
            subscriptionHash = subscriptionHashes[i]
            if not (subscriptionHash in client.subscriptions):
                client.subscriptions[requestId] = subscriptionHash
        return await self.watch_multiple(url, messageHashes, message, subscriptionHashes, subscription)

    async def un_subscribe_multiple(self, url, messageHashes, topic, subscriptionHashes, params={}, subscription: dict = None):
        requestId = str(self.request_id())
        request: dict = {
            'id': requestId,
            'type': 'unsubscribe',
            'topic': topic,
            'response': True,
        }
        message = self.extend(request, params)
        if subscription is not None:
            subscription[requestId] = requestId
        client = self.client(url)
        for i in range(0, len(subscriptionHashes)):
            subscriptionHash = subscriptionHashes[i]
            if not (subscriptionHash in client.subscriptions):
                client.subscriptions[requestId] = subscriptionHash
        return await self.watch_multiple(url, messageHashes, message, subscriptionHashes, subscription)

    async def watch_ticker(self, symbol: str, params={}) -> Ticker:
        """
        watches a price ticker, a statistical calculation with the information calculated over the past 24 hours for a specific market

        https://www.kucoin.com/docs/websocket/spot-trading/public-channels/market-snapshot

        :param str symbol: unified symbol of the market to fetch the ticker for
        :param dict [params]: extra parameters specific to the exchange API endpoint
        :returns dict: a `ticker structure <https://docs.ccxt.com/#/?id=ticker-structure>`
        """
        await self.load_markets()
        market = self.market(symbol)
        symbol = market['symbol']
        url = await self.negotiate(False)
        method, query = self.handle_option_and_params(params, 'watchTicker', 'method', '/market/snapshot')
        topic = method + ':' + market['id']
        messageHash = 'ticker:' + symbol
        return await self.subscribe(url, messageHash, topic, query)

    async def un_watch_ticker(self, symbol: str, params={}) -> Ticker:
        """
        unWatches a price ticker, a statistical calculation with the information calculated over the past 24 hours for a specific market

        https://www.kucoin.com/docs/websocket/spot-trading/public-channels/market-snapshot

        :param str symbol: unified symbol of the market to fetch the ticker for
        :param dict [params]: extra parameters specific to the exchange API endpoint
        :returns dict: a `ticker structure <https://docs.ccxt.com/#/?id=ticker-structure>`
        """
        await self.load_markets()
        market = self.market(symbol)
        symbol = market['symbol']
        url = await self.negotiate(False)
        method = None
        method, params = self.handle_option_and_params(params, 'watchTicker', 'method', '/market/snapshot')
        topic = method + ':' + market['id']
        messageHash = 'unsubscribe:ticker:' + symbol
        subMessageHash = 'ticker:' + symbol
        subscription = {
            'messageHashes': [messageHash],
            'subMessageHashes': [subMessageHash],
            'topic': 'trades',
            'unsubscribe': True,
            'symbols': [symbol],
        }
        return await self.un_subscribe(url, messageHash, topic, subMessageHash, params, subscription)

    async def watch_tickers(self, symbols: Strings = None, params={}) -> Tickers:
        """

        https://www.kucoin.com/docs/websocket/spot-trading/public-channels/ticker

        watches a price ticker, a statistical calculation with the information calculated over the past 24 hours for all markets of a specific list
        :param str[] symbols: unified symbol of the market to fetch the ticker for
        :param dict [params]: extra parameters specific to the exchange API endpoint
        :param str [params.method]: either '/market/snapshot' or '/market/ticker' default is '/market/ticker'
        :returns dict: a `ticker structure <https://docs.ccxt.com/#/?id=ticker-structure>`
        """
        await self.load_markets()
        symbols = self.market_symbols(symbols)
        messageHash = 'tickers'
        method = None
        method, params = self.handle_option_and_params(params, 'watchTickers', 'method', '/market/ticker')
        messageHashes = []
        topics = []
        if symbols is not None:
            for i in range(0, len(symbols)):
                symbol = symbols[i]
                messageHashes.append('ticker:' + symbol)
                market = self.market(symbol)
                topics.append(method + ':' + market['id'])
        url = await self.negotiate(False)
        tickers = None
        if symbols is None:
            allTopic = method + ':all'
            tickers = await self.subscribe(url, messageHash, allTopic, params)
            if self.newUpdates:
                return tickers
        else:
            marketIds = self.market_ids(symbols)
            symbolsTopic = method + ':' + ','.join(marketIds)
            tickers = await self.subscribe_multiple(url, messageHashes, symbolsTopic, topics, params)
            if self.newUpdates:
                newDict: dict = {}
                newDict[tickers['symbol']] = tickers
                return newDict
        return self.filter_by_array(self.tickers, 'symbol', symbols)

    def handle_ticker(self, client: Client, message):
        #
        # market/snapshot
        #
        # updates come in every 2 sec unless there
        # were no changes since the previous update
        #
        #     {
        #         "data": {
        #             "sequence": "1545896669291",
        #             "data": {
        #                 "trading": True,
        #                 "symbol": "KCS-BTC",
        #                 "buy": 0.00011,
        #                 "sell": 0.00012,
        #                 "sort": 100,
        #                 "volValue": 3.13851792584,  # total
        #                 "baseCurrency": "KCS",
        #                 "market": "BTC",
        #                 "quoteCurrency": "BTC",
        #                 "symbolCode": "KCS-BTC",
        #                 "datetime": 1548388122031,
        #                 "high": 0.00013,
        #                 "vol": 27514.34842,
        #                 "low": 0.0001,
        #                 "changePrice": -1.0e-5,
        #                 "changeRate": -0.0769,
        #                 "lastTradedPrice": 0.00012,
        #                 "board": 0,
        #                 "mark": 0
        #             }
        #         },
        #         "subject": "trade.snapshot",
        #         "topic": "/market/snapshot:KCS-BTC",
        #         "type": "message"
        #     }
        #
        # market/ticker
        #
        #     {
        #         "type": "message",
        #         "topic": "/market/ticker:BTC-USDT",
        #         "subject": "trade.ticker",
        #         "data": {
        #             "bestAsk": "62163",
        #             "bestAskSize": "0.99011388",
        #             "bestBid": "62162.9",
        #             "bestBidSize": "0.04794181",
        #             "price": "62162.9",
        #             "sequence": "1621383371852",
        #             "size": "0.00832274",
        #             "time": 1634641987564
        #         }
        #     }
        #
        topic = self.safe_string(message, 'topic')
        market = None
        if topic is not None:
            parts = topic.split(':')
            first = self.safe_string(parts, 1)
            marketId = None
            if first == 'all':
                marketId = self.safe_string(message, 'subject')
            else:
                marketId = first
            market = self.safe_market(marketId, market, '-')
        data = self.safe_value(message, 'data', {})
        rawTicker = self.safe_value(data, 'data', data)
        ticker = self.parse_ticker(rawTicker, market)
        symbol = ticker['symbol']
        self.tickers[symbol] = ticker
        messageHash = 'ticker:' + symbol
        client.resolve(ticker, messageHash)
        # watchTickers
        allTickers: dict = {}
        allTickers[symbol] = ticker
        client.resolve(allTickers, 'tickers')

    async def watch_bids_asks(self, symbols: Strings = None, params={}) -> Tickers:
        """

        https://www.kucoin.com/docs/websocket/spot-trading/public-channels/level1-bbo-market-data

        watches best bid & ask for symbols
        :param str[] symbols: unified symbol of the market to fetch the ticker for
        :param dict [params]: extra parameters specific to the exchange API endpoint
        :returns dict: a `ticker structure <https://docs.ccxt.com/#/?id=ticker-structure>`
        """
        ticker = await self.watch_multi_helper('watchBidsAsks', '/spotMarket/level1:', symbols, params)
        if self.newUpdates:
            tickers: dict = {}
            tickers[ticker['symbol']] = ticker
            return tickers
        return self.filter_by_array(self.bidsasks, 'symbol', symbols)

    async def watch_multi_helper(self, methodName, channelName: str, symbols: Strings = None, params={}):
        await self.load_markets()
        symbols = self.market_symbols(symbols, None, False, True, False)
        length = len(symbols)
        if length > 100:
            raise ArgumentsRequired(self.id + ' ' + methodName + '() accepts a maximum of 100 symbols')
        messageHashes = []
        for i in range(0, len(symbols)):
            symbol = symbols[i]
            market = self.market(symbol)
            messageHashes.append('bidask@' + market['symbol'])
        url = await self.negotiate(False)
        marketIds = self.market_ids(symbols)
        joined = ','.join(marketIds)
        requestId = str(self.request_id())
        request: dict = {
            'id': requestId,
            'type': 'subscribe',
            'topic': channelName + joined,
            'response': True,
        }
        message = self.extend(request, params)
        return await self.watch_multiple(url, messageHashes, message, messageHashes)

    def handle_bid_ask(self, client: Client, message):
        #
        # arrives one symbol dict
        #
        #     {
        #         topic: '/spotMarket/level1:ETH-USDT',
        #         type: 'message',
        #         data: {
        #             asks: ['3347.42', '2.0778387'],
        #             bids: ['3347.41', '6.0411697'],
        #             timestamp: 1712231142085
        #         },
        #         subject: 'level1'
        #     }
        #
        parsedTicker = self.parse_ws_bid_ask(message)
        symbol = parsedTicker['symbol']
        self.bidsasks[symbol] = parsedTicker
        messageHash = 'bidask@' + symbol
        client.resolve(parsedTicker, messageHash)

    def parse_ws_bid_ask(self, ticker, market=None):
        topic = self.safe_string(ticker, 'topic')
        parts = topic.split(':')
        marketId = parts[1]
        market = self.safe_market(marketId, market)
        symbol = self.safe_string(market, 'symbol')
        data = self.safe_dict(ticker, 'data', {})
        ask = self.safe_list(data, 'asks', [])
        bid = self.safe_list(data, 'bids', [])
        timestamp = self.safe_integer(data, 'timestamp')
        return self.safe_ticker({
            'symbol': symbol,
            'timestamp': timestamp,
            'datetime': self.iso8601(timestamp),
            'ask': self.safe_number(ask, 0),
            'askVolume': self.safe_number(ask, 1),
            'bid': self.safe_number(bid, 0),
            'bidVolume': self.safe_number(bid, 1),
            'info': ticker,
        }, market)

    async def watch_ohlcv(self, symbol: str, timeframe: str = '1m', since: Int = None, limit: Int = None, params={}) -> List[list]:
        """
        watches historical candlestick data containing the open, high, low, and close price, and the volume of a market

        https://www.kucoin.com/docs/websocket/spot-trading/public-channels/klines

        :param str symbol: unified symbol of the market to fetch OHLCV data for
        :param str timeframe: the length of time each candle represents
        :param int [since]: timestamp in ms of the earliest candle to fetch
        :param int [limit]: the maximum amount of candles to fetch
        :param dict [params]: extra parameters specific to the exchange API endpoint
        :returns int[][]: A list of candles ordered, open, high, low, close, volume
        """
        await self.load_markets()
        url = await self.negotiate(False)
        market = self.market(symbol)
        symbol = market['symbol']
        period = self.safe_string(self.timeframes, timeframe, timeframe)
        topic = '/market/candles:' + market['id'] + '_' + period
        messageHash = 'candles:' + symbol + ':' + timeframe
        ohlcv = await self.subscribe(url, messageHash, topic, params)
        if self.newUpdates:
            limit = ohlcv.getLimit(symbol, limit)
        return self.filter_by_since_limit(ohlcv, since, limit, 0, True)

    async def un_watch_ohlcv(self, symbol: str, timeframe: str = '1m', params={}) -> List[list]:
        """
        unWatches historical candlestick data containing the open, high, low, and close price, and the volume of a market

        https://www.kucoin.com/docs/websocket/spot-trading/public-channels/klines

        :param str symbol: unified symbol of the market to fetch OHLCV data for
        :param str timeframe: the length of time each candle represents
        :param dict [params]: extra parameters specific to the exchange API endpoint
        :returns int[][]: A list of candles ordered, open, high, low, close, volume
        """
        await self.load_markets()
        url = await self.negotiate(False)
        market = self.market(symbol)
        symbol = market['symbol']
        period = self.safe_string(self.timeframes, timeframe, timeframe)
        topic = '/market/candles:' + market['id'] + '_' + period
        messageHash = 'unsubscribe:candles:' + symbol + ':' + timeframe
        subMessageHash = 'candles:' + symbol + ':' + timeframe
        subscription = {
            'messageHashes': [messageHash],
            'subMessageHashes': [subMessageHash],
            'topic': 'ohlcv',
            'unsubscribe': True,
            'symbols': [symbol],
        }
        return await self.un_subscribe(url, messageHash, topic, messageHash, params, subscription)

    def handle_ohlcv(self, client: Client, message):
        #
        #     {
        #         "data": {
        #             "symbol": "BTC-USDT",
        #             "candles": [
        #                 "1624881240",
        #                 "34138.8",
        #                 "34121.6",
        #                 "34138.8",
        #                 "34097.9",
        #                 "3.06097133",
        #                 "104430.955068564"
        #             ],
        #             "time": 1624881284466023700
        #         },
        #         "subject": "trade.candles.update",
        #         "topic": "/market/candles:BTC-USDT_1min",
        #         "type": "message"
        #     }
        #
        data = self.safe_value(message, 'data', {})
        marketId = self.safe_string(data, 'symbol')
        candles = self.safe_value(data, 'candles', [])
        topic = self.safe_string(message, 'topic')
        parts = topic.split('_')
        interval = self.safe_string(parts, 1)
        # use a reverse lookup in a static map instead
        timeframe = self.find_timeframe(interval)
        market = self.safe_market(marketId)
        symbol = market['symbol']
        messageHash = 'candles:' + symbol + ':' + timeframe
        self.ohlcvs[symbol] = self.safe_value(self.ohlcvs, symbol, {})
        stored = self.safe_value(self.ohlcvs[symbol], timeframe)
        if stored is None:
            limit = self.safe_integer(self.options, 'OHLCVLimit', 1000)
            stored = ArrayCacheByTimestamp(limit)
            self.ohlcvs[symbol][timeframe] = stored
        ohlcv = self.parse_ohlcv(candles, market)
        stored.append(ohlcv)
        client.resolve(stored, messageHash)

    async def watch_trades(self, symbol: str, since: Int = None, limit: Int = None, params={}) -> List[Trade]:
        """
        get the list of most recent trades for a particular symbol

        https://www.kucoin.com/docs/websocket/spot-trading/public-channels/match-execution-data

        :param str symbol: unified symbol of the market to fetch trades for
        :param int [since]: timestamp in ms of the earliest trade to fetch
        :param int [limit]: the maximum amount of trades to fetch
        :param dict [params]: extra parameters specific to the exchange API endpoint
        :returns dict[]: a list of `trade structures <https://docs.ccxt.com/#/?id=public-trades>`
        """
        return await self.watch_trades_for_symbols([symbol], since, limit, params)

    async def watch_trades_for_symbols(self, symbols: List[str], since: Int = None, limit: Int = None, params={}) -> List[Trade]:
        """
        get the list of most recent trades for a particular symbol

        https://www.kucoin.com/docs/websocket/spot-trading/public-channels/match-execution-data

        :param str[] symbols:
        :param int [since]: timestamp in ms of the earliest trade to fetch
        :param int [limit]: the maximum amount of trades to fetch
        :param dict [params]: extra parameters specific to the exchange API endpoint
        :returns dict[]: a list of `trade structures <https://docs.ccxt.com/#/?id=public-trades>`
        """
        symbolsLength = len(symbols)
        if symbolsLength == 0:
            raise ArgumentsRequired(self.id + ' watchTradesForSymbols() requires a non-empty array of symbols')
        await self.load_markets()
        symbols = self.market_symbols(symbols)
        marketIds = self.market_ids(symbols)
        url = await self.negotiate(False)
        messageHashes = []
        subscriptionHashes = []
        topic = '/market/match:' + ','.join(marketIds)
        for i in range(0, len(symbols)):
            symbol = symbols[i]
            messageHashes.append('trades:' + symbol)
            marketId = marketIds[i]
            subscriptionHashes.append('/market/match:' + marketId)
        trades = await self.subscribe_multiple(url, messageHashes, topic, subscriptionHashes, params)
        if self.newUpdates:
            first = self.safe_value(trades, 0)
            tradeSymbol = self.safe_string(first, 'symbol')
            limit = trades.getLimit(tradeSymbol, limit)
        return self.filter_by_since_limit(trades, since, limit, 'timestamp', True)

    async def un_watch_trades_for_symbols(self, symbols: List[str], params={}) -> Any:
        """
        unWatches trades stream

        https://www.kucoin.com/docs/websocket/spot-trading/public-channels/match-execution-data

        :param str symbols:
        :param dict [params]: extra parameters specific to the exchange API endpoint
        :returns dict[]: a list of `trade structures <https://docs.ccxt.com/#/?id=public-trades>`
        """
        await self.load_markets()
        symbols = self.market_symbols(symbols, None, False)
        marketIds = self.market_ids(symbols)
        url = await self.negotiate(False)
        messageHashes = []
        subscriptionHashes = []
        topic = '/market/match:' + ','.join(marketIds)
        for i in range(0, len(symbols)):
            symbol = symbols[i]
            messageHashes.append('unsubscribe:trades:' + symbol)
            subscriptionHashes.append('trades:' + symbol)
        subscription = {
            'messageHashes': messageHashes,
            'subMessageHashes': subscriptionHashes,
            'topic': 'trades',
            'unsubscribe': True,
            'symbols': symbols,
        }
        return await self.un_subscribe_multiple(url, messageHashes, topic, messageHashes, params, subscription)

    async def un_watch_trades(self, symbol: str, params={}) -> Any:
        """
        unWatches trades stream

        https://www.kucoin.com/docs/websocket/spot-trading/public-channels/match-execution-data

        :param str symbol: unified symbol of the market to fetch trades for
        :param dict [params]: extra parameters specific to the exchange API endpoint
        :returns dict[]: a list of `trade structures <https://docs.ccxt.com/#/?id=public-trades>`
        """
        return await self.un_watch_trades_for_symbols([symbol], params)

    def handle_trade(self, client: Client, message):
        #
        #     {
        #         "data": {
        #             "sequence": "1568787654360",
        #             "symbol": "BTC-USDT",
        #             "side": "buy",
        #             "size": "0.00536577",
        #             "price": "9345",
        #             "takerOrderId": "5e356c4a9f1a790008f8d921",
        #             "time": "1580559434436443257",
        #             "type": "match",
        #             "makerOrderId": "5e356bffedf0010008fa5d7f",
        #             "tradeId": "5e356c4aeefabd62c62a1ece"
        #         },
        #         "subject": "trade.l3match",
        #         "topic": "/market/match:BTC-USDT",
        #         "type": "message"
        #     }
        #
        data = self.safe_value(message, 'data', {})
        trade = self.parse_trade(data)
        symbol = trade['symbol']
        messageHash = 'trades:' + symbol
        trades = self.safe_value(self.trades, symbol)
        if trades is None:
            limit = self.safe_integer(self.options, 'tradesLimit', 1000)
            trades = ArrayCache(limit)
            self.trades[symbol] = trades
        trades.append(trade)
        client.resolve(trades, messageHash)

    async def watch_order_book(self, symbol: str, limit: Int = None, params={}) -> OrderBook:
        """

        https://www.kucoin.com/docs/websocket/spot-trading/public-channels/level1-bbo-market-data
        https://www.kucoin.com/docs/websocket/spot-trading/public-channels/level2-market-data
        https://www.kucoin.com/docs/websocket/spot-trading/public-channels/level2-5-best-ask-bid-orders
        https://www.kucoin.com/docs/websocket/spot-trading/public-channels/level2-50-best-ask-bid-orders

        watches information on open orders with bid(buy) and ask(sell) prices, volumes and other data
        :param str symbol: unified symbol of the market to fetch the order book for
        :param int [limit]: the maximum amount of order book entries to return
        :param dict [params]: extra parameters specific to the exchange API endpoint
        :param str [params.method]: either '/market/level2' or '/spotMarket/level2Depth5' or '/spotMarket/level2Depth50' default is '/market/level2'
        :returns dict: A dictionary of `order book structures <https://docs.ccxt.com/#/?id=order-book-structure>` indexed by market symbols
        """
        #
        # https://docs.kucoin.com/#level-2-market-data
        #
        # 1. After receiving the websocket Level 2 data flow, cache the data.
        # 2. Initiate a REST request to get the snapshot data of Level 2 order book.
        # 3. Playback the cached Level 2 data flow.
        # 4. Apply the new Level 2 data flow to the local snapshot to ensure that
        # the sequence of the new Level 2 update lines up with the sequence of
        # the previous Level 2 data. Discard all the message prior to that
        # sequence, and then playback the change to snapshot.
        # 5. Update the level2 full data based on sequence according to the
        # size. If the price is 0, ignore the messages and update the sequence.
        # If the size=0, update the sequence and remove the price of which the
        # size is 0 out of level 2. Fr other cases, please update the price.
        #
        return await self.watch_order_book_for_symbols([symbol], limit, params)

    async def un_watch_order_book(self, symbol: str, params={}) -> Any:
        """

        https://www.kucoin.com/docs/websocket/spot-trading/public-channels/level1-bbo-market-data
        https://www.kucoin.com/docs/websocket/spot-trading/public-channels/level2-market-data
        https://www.kucoin.com/docs/websocket/spot-trading/public-channels/level2-5-best-ask-bid-orders
        https://www.kucoin.com/docs/websocket/spot-trading/public-channels/level2-50-best-ask-bid-orders

        unWatches information on open orders with bid(buy) and ask(sell) prices, volumes and other data
        :param str symbol: unified symbol of the market to fetch the order book for
        :param dict [params]: extra parameters specific to the exchange API endpoint
        :param str [params.method]: either '/market/level2' or '/spotMarket/level2Depth5' or '/spotMarket/level2Depth50' default is '/market/level2'
        :returns dict: A dictionary of `order book structures <https://docs.ccxt.com/#/?id=order-book-structure>` indexed by market symbols
        """
        return await self.un_watch_order_book_for_symbols([symbol], params)

    async def watch_order_book_for_symbols(self, symbols: List[str], limit: Int = None, params={}) -> OrderBook:
        """

        https://www.kucoin.com/docs/websocket/spot-trading/public-channels/level1-bbo-market-data
        https://www.kucoin.com/docs/websocket/spot-trading/public-channels/level2-market-data
        https://www.kucoin.com/docs/websocket/spot-trading/public-channels/level2-5-best-ask-bid-orders
        https://www.kucoin.com/docs/websocket/spot-trading/public-channels/level2-50-best-ask-bid-orders

        watches information on open orders with bid(buy) and ask(sell) prices, volumes and other data
        :param str[] symbols: unified array of symbols
        :param int [limit]: the maximum amount of order book entries to return
        :param dict [params]: extra parameters specific to the exchange API endpoint
        :param str [params.method]: either '/market/level2' or '/spotMarket/level2Depth5' or '/spotMarket/level2Depth50' default is '/market/level2'
        :returns dict: A dictionary of `order book structures <https://docs.ccxt.com/#/?id=order-book-structure>` indexed by market symbols
        """
        symbolsLength = len(symbols)
        if symbolsLength == 0:
            raise ArgumentsRequired(self.id + ' watchOrderBookForSymbols() requires a non-empty array of symbols')
        if limit is not None:
            if (limit != 20) and (limit != 100) and (limit != 50) and (limit != 5):
                raise ExchangeError(self.id + " watchOrderBook 'limit' argument must be None, 5, 20, 50 or 100")
        await self.load_markets()
        symbols = self.market_symbols(symbols)
        marketIds = self.market_ids(symbols)
        url = await self.negotiate(False)
        method: Str = None
        method, params = self.handle_option_and_params(params, 'watchOrderBook', 'method', '/market/level2')
        if (limit == 5) or (limit == 50):
            method = '/spotMarket/level2Depth' + str(limit)
        topic = method + ':' + ','.join(marketIds)
        messageHashes = []
        subscriptionHashes = []
        for i in range(0, len(symbols)):
            symbol = symbols[i]
            messageHashes.append('orderbook:' + symbol)
            marketId = marketIds[i]
            subscriptionHashes.append(method + ':' + marketId)
        subscription = {}
        if method == '/market/level2':  # other streams return the entire orderbook, so we don't need to fetch the snapshot through REST
            subscription = {
                'method': self.handle_order_book_subscription,
                'symbols': symbols,
                'limit': limit,
            }
        orderbook = await self.subscribe_multiple(url, messageHashes, topic, subscriptionHashes, params, subscription)
        return orderbook.limit()

    async def un_watch_order_book_for_symbols(self, symbols: List[str], params={}) -> Any:
        """

        https://www.kucoin.com/docs/websocket/spot-trading/public-channels/level1-bbo-market-data
        https://www.kucoin.com/docs/websocket/spot-trading/public-channels/level2-market-data
        https://www.kucoin.com/docs/websocket/spot-trading/public-channels/level2-5-best-ask-bid-orders
        https://www.kucoin.com/docs/websocket/spot-trading/public-channels/level2-50-best-ask-bid-orders

        unWatches information on open orders with bid(buy) and ask(sell) prices, volumes and other data
        :param str[] symbols: unified array of symbols
        :param dict [params]: extra parameters specific to the exchange API endpoint
        :param str [params.method]: either '/market/level2' or '/spotMarket/level2Depth5' or '/spotMarket/level2Depth50' default is '/market/level2'
        :returns dict: A dictionary of `order book structures <https://docs.ccxt.com/#/?id=order-book-structure>` indexed by market symbols
        """
        limit = self.safe_integer(params, 'limit')
        params = self.omit(params, 'limit')
        await self.load_markets()
        symbols = self.market_symbols(symbols, None, False)
        marketIds = self.market_ids(symbols)
        url = await self.negotiate(False)
        method: Str = None
        method, params = self.handle_option_and_params(params, 'watchOrderBook', 'method', '/market/level2')
        if (limit == 5) or (limit == 50):
            method = '/spotMarket/level2Depth' + str(limit)
        topic = method + ':' + ','.join(marketIds)
        messageHashes = []
        subscriptionHashes = []
        for i in range(0, len(symbols)):
            symbol = symbols[i]
            messageHashes.append('unsubscribe:orderbook:' + symbol)
            subscriptionHashes.append('orderbook:' + symbol)
        subscription = {
            'messageHashes': messageHashes,
            'symbols': symbols,
            'unsubscribe': True,
            'topic': 'orderbook',
            'subMessageHashes': subscriptionHashes,
        }
        return await self.un_subscribe_multiple(url, messageHashes, topic, messageHashes, params, subscription)

    def handle_order_book(self, client: Client, message):
        #
        # initial snapshot is fetched with ccxt's fetchOrderBook
        # the feed does not include a snapshot, just the deltas
        #
        #     {
        #         "type":"message",
        #         "topic":"/market/level2:BTC-USDT",
        #         "subject":"trade.l2update",
        #         "data":{
        #             "sequenceStart":1545896669105,
        #             "sequenceEnd":1545896669106,
        #             "symbol":"BTC-USDT",
        #             "changes": {
        #                 "asks": [["6","1","1545896669105"]],  # price, size, sequence
        #                 "bids": [["4","1","1545896669106"]]
        #             }
        #         }
        #     }
        #
        #     {
        #         "topic": "/spotMarket/level2Depth5:BTC-USDT",
        #         "type": "message",
        #         "data": {
        #             "asks": [
        #                 [
        #                     "42815.6",
        #                     "1.24016245"
        #                 ]
        #             ],
        #             "bids": [
        #                 [
        #                     "42815.5",
        #                     "0.08652716"
        #                 ]
        #             ],
        #             "timestamp": 1707204474018
        #         },
        #         "subject": "level2"
        #     }
        #
        data = self.safe_value(message, 'data')
        subject = self.safe_string(message, 'subject')
        topic = self.safe_string(message, 'topic')
        topicParts = topic.split(':')
        topicSymbol = self.safe_string(topicParts, 1)
        topicChannel = self.safe_string(topicParts, 0)
        marketId = self.safe_string(data, 'symbol', topicSymbol)
        symbol = self.safe_symbol(marketId, None, '-')
        messageHash = 'orderbook:' + symbol
        # orderbook = self.safe_dict(self.orderbooks, symbol)
        if subject == 'level2':
            if not (symbol in self.orderbooks):
                self.orderbooks[symbol] = self.order_book()
            else:
                orderbook = self.orderbooks[symbol]
                orderbook.reset()
            self.orderbooks[symbol]['symbol'] = symbol
        else:
            if not (symbol in self.orderbooks):
                self.orderbooks[symbol] = self.order_book()
            orderbook = self.orderbooks[symbol]
            nonce = self.safe_integer(orderbook, 'nonce')
            deltaEnd = self.safe_integer_2(data, 'sequenceEnd', 'timestamp')
            if nonce is None:
                cacheLength = len(orderbook.cache)
                subscriptions = list(client.subscriptions.keys())
                subscription = None
                for i in range(0, len(subscriptions)):
                    key = subscriptions[i]
                    if (key.find(topicSymbol) >= 0) and (key.find(topicChannel) >= 0):
                        subscription = client.subscriptions[key]
                        break
                limit = self.safe_integer(subscription, 'limit')
                snapshotDelay = self.handle_option('watchOrderBook', 'snapshotDelay', 5)
                if cacheLength == snapshotDelay:
                    self.spawn(self.load_order_book, client, messageHash, symbol, limit, {})
                orderbook.cache.append(data)
                return
            elif nonce >= deltaEnd:
                return
        self.handle_delta(self.orderbooks[symbol], data)
        client.resolve(self.orderbooks[symbol], messageHash)

    def get_cache_index(self, orderbook, cache):
        firstDelta = self.safe_value(cache, 0)
        nonce = self.safe_integer(orderbook, 'nonce')
        firstDeltaStart = self.safe_integer(firstDelta, 'sequenceStart')
        if nonce < firstDeltaStart - 1:
            return -1
        for i in range(0, len(cache)):
            delta = cache[i]
            deltaStart = self.safe_integer(delta, 'sequenceStart')
            deltaEnd = self.safe_integer(delta, 'sequenceEnd')
            if (nonce >= deltaStart - 1) and (nonce < deltaEnd):
                return i
        return len(cache)

    def handle_delta(self, orderbook, delta):
        timestamp = self.safe_integer_2(delta, 'time', 'timestamp')
        orderbook['nonce'] = self.safe_integer(delta, 'sequenceEnd', timestamp)
        orderbook['timestamp'] = timestamp
        orderbook['datetime'] = self.iso8601(timestamp)
        changes = self.safe_value(delta, 'changes', delta)
        bids = self.safe_value(changes, 'bids', [])
        asks = self.safe_value(changes, 'asks', [])
        storedBids = orderbook['bids']
        storedAsks = orderbook['asks']
        self.handle_bid_asks(storedBids, bids)
        self.handle_bid_asks(storedAsks, asks)

    def handle_bid_asks(self, bookSide, bidAsks):
        for i in range(0, len(bidAsks)):
            bidAsk = self.parse_bid_ask(bidAsks[i])
            bookSide.storeArray(bidAsk)

    def handle_order_book_subscription(self, client: Client, message, subscription):
        limit = self.safe_integer(subscription, 'limit')
        symbols = self.safe_value(subscription, 'symbols')
        if symbols is None:
            symbol = self.safe_string(subscription, 'symbol')
            self.orderbooks[symbol] = self.order_book({}, limit)
        else:
            for i in range(0, len(symbols)):
                symbol = symbols[i]
                self.orderbooks[symbol] = self.order_book({}, limit)
        # moved snapshot initialization to handleOrderBook to fix
        # https://github.com/ccxt/ccxt/issues/6820
        # the general idea is to fetch the snapshot after the first delta
        # but not before, because otherwise we cannot synchronize the feed

    def handle_subscription_status(self, client: Client, message):
        #
        #     {
        #         "id": "1578090438322",
        #         "type": "ack"
        #     }
        #
        id = self.safe_string(message, 'id')
        if not (id in client.subscriptions):
            return
        subscriptionHash = self.safe_string(client.subscriptions, id)
        subscription = self.safe_value(client.subscriptions, subscriptionHash)
        del client.subscriptions[id]
        method = self.safe_value(subscription, 'method')
        if method is not None:
            method(client, message, subscription)
        isUnSub = self.safe_bool(subscription, 'unsubscribe', False)
        if isUnSub:
            messageHashes = self.safe_list(subscription, 'messageHashes', [])
            subMessageHashes = self.safe_list(subscription, 'subMessageHashes', [])
            for i in range(0, len(messageHashes)):
                messageHash = messageHashes[i]
                subHash = subMessageHashes[i]
                self.clean_unsubscription(client, subHash, messageHash)
            self.clean_cache(subscription)

    def handle_system_status(self, client: Client, message):
        #
        # todo: answer the question whether handleSystemStatus should be renamed
        # and unified for any usage pattern that
        # involves system status and maintenance updates
        #
        #     {
        #         "id": "1578090234088",  # connectId
        #         "type": "welcome",
        #     }
        #
        return message

    async def watch_orders(self, symbol: Str = None, since: Int = None, limit: Int = None, params={}) -> List[Order]:
        """
        watches information on multiple orders made by the user

        https://www.kucoin.com/docs/websocket/spot-trading/private-channels/private-order-change
        https://www.kucoin.com/docs/websocket/spot-trading/private-channels/stop-order-event

        :param str symbol: unified market symbol of the market orders were made in
        :param int [since]: the earliest time in ms to fetch orders for
        :param int [limit]: the maximum number of order structures to retrieve
        :param dict [params]: extra parameters specific to the exchange API endpoint
        :param boolean [params.trigger]: trigger orders are watched if True
        :returns dict[]: a list of `order structures <https://docs.ccxt.com/#/?id=order-structure>`
        """
        await self.load_markets()
        trigger = self.safe_value_2(params, 'stop', 'trigger')
        params = self.omit(params, ['stop', 'trigger'])
        url = await self.negotiate(True)
        topic = '/spotMarket/advancedOrders' if trigger else '/spotMarket/tradeOrders'
        request: dict = {
            'privateChannel': True,
        }
        messageHash = 'orders'
        if symbol is not None:
            market = self.market(symbol)
            symbol = market['symbol']
            messageHash = messageHash + ':' + symbol
        orders = await self.subscribe(url, messageHash, topic, self.extend(request, params))
        if self.newUpdates:
            limit = orders.getLimit(symbol, limit)
        return self.filter_by_symbol_since_limit(orders, symbol, since, limit, True)

    def parse_ws_order_status(self, status):
        statuses: dict = {
            'open': 'open',
            'filled': 'closed',
            'match': 'open',
            'update': 'open',
            'canceled': 'canceled',
            'cancel': 'canceled',
            'TRIGGERED': 'triggered',
        }
        return self.safe_string(statuses, status, status)

    def parse_ws_order(self, order, market=None):
        #
        # /spotMarket/tradeOrders
        #
        #    {
        #        "symbol": "XCAD-USDT",
        #        "orderType": "limit",
        #        "side": "buy",
        #        "orderId": "6249167327218b000135e749",
        #        "type": "canceled",
        #        "orderTime": 1648957043065280224,
        #        "size": "100.452",
        #        "filledSize": "0",
        #        "price": "2.9635",
        #        "clientOid": "buy-XCAD-USDT-1648957043010159",
        #        "remainSize": "0",
        #        "status": "done",
        #        "ts": 1648957054031001037
        #    }
        #
        # /spotMarket/advancedOrders
        #
        #    {
        #        "createdAt": 1589789942337,
        #        "orderId": "5ec244f6a8a75e0009958237",
        #        "orderPrice": "0.00062",
        #        "orderType": "stop",
        #        "side": "sell",
        #        "size": "1",
        #        "stop": "entry",
        #        "stopPrice": "0.00062",
        #        "symbol": "KCS-BTC",
        #        "tradeType": "TRADE",
        #        "triggerSuccess": True,
        #        "ts": 1589790121382281286,
        #        "type": "triggered"
        #    }
        #
        rawType = self.safe_string(order, 'type')
        status = self.parse_ws_order_status(rawType)
        timestamp = self.safe_integer_2(order, 'orderTime', 'createdAt')
        marketId = self.safe_string(order, 'symbol')
        market = self.safe_market(marketId, market)
        triggerPrice = self.safe_string(order, 'stopPrice')
        triggerSuccess = self.safe_value(order, 'triggerSuccess')
        triggerFail = (triggerSuccess is not True) and (triggerSuccess is not None)  # TODO: updated to triggerSuccess == False once transpiler transpiles it correctly
        if (status == 'triggered') and triggerFail:
            status = 'canceled'
        return self.safe_order({
            'info': order,
            'symbol': market['symbol'],
            'id': self.safe_string(order, 'orderId'),
            'clientOrderId': self.safe_string(order, 'clientOid'),
            'timestamp': timestamp,
            'datetime': self.iso8601(timestamp),
            'lastTradeTimestamp': None,
            'type': self.safe_string_lower(order, 'orderType'),
            'timeInForce': None,
            'postOnly': None,
            'side': self.safe_string_lower(order, 'side'),
            'price': self.safe_string_2(order, 'price', 'orderPrice'),
            'stopPrice': triggerPrice,
            'triggerPrice': triggerPrice,
            'amount': self.safe_string(order, 'size'),
            'cost': None,
            'average': None,
            'filled': self.safe_string(order, 'filledSize'),
            'remaining': None,
            'status': status,
            'fee': None,
            'trades': None,
        }, market)

    def handle_order(self, client: Client, message):
        #
        # Trigger Orders
        #
        #    {
        #        "createdAt": 1692745706437,
        #        "error": "Balance insufficient!",       # not always there
        #        "orderId": "vs86kp757vlda6ni003qs70v",
        #        "orderPrice": "0.26",
        #        "orderType": "stop",
        #        "side": "sell",
        #        "size": "5",
        #        "stop": "loss",
        #        "stopPrice": "0.26",
        #        "symbol": "ADA-USDT",
        #        "tradeType": "TRADE",
        #        "triggerSuccess": False,                # not always there
        #        "ts": "1692745706442929298",
        #        "type": "open"
        #    }
        #
        messageHash = 'orders'
        data = self.safe_value(message, 'data')
        tradeId = self.safe_string(data, 'tradeId')
        if tradeId is not None:
            self.handle_my_trade(client, message)
        parsed = self.parse_ws_order(data)
        symbol = self.safe_string(parsed, 'symbol')
        orderId = self.safe_string(parsed, 'id')
        triggerPrice = self.safe_value(parsed, 'triggerPrice')
        isTriggerOrder = (triggerPrice is not None)
        if self.orders is None:
            limit = self.safe_integer(self.options, 'ordersLimit', 1000)
            self.orders = ArrayCacheBySymbolById(limit)
            self.triggerOrders = ArrayCacheBySymbolById(limit)
        cachedOrders = self.triggerOrders if isTriggerOrder else self.orders
        orders = self.safe_value(cachedOrders.hashmap, symbol, {})
        order = self.safe_value(orders, orderId)
        if order is not None:
            # todo add others to calculate average etc
            if order['status'] == 'closed':
                parsed['status'] = 'closed'
        cachedOrders.append(parsed)
        client.resolve(cachedOrders, messageHash)
        symbolSpecificMessageHash = messageHash + ':' + symbol
        client.resolve(cachedOrders, symbolSpecificMessageHash)

    async def watch_my_trades(self, symbol: Str = None, since: Int = None, limit: Int = None, params={}) -> List[Trade]:
        """
        watches information on multiple trades made by the user

        https://www.kucoin.com/docs/websocket/spot-trading/private-channels/private-order-change

        :param str symbol: unified market symbol of the market trades were made in
        :param int [since]: the earliest time in ms to fetch trades for
        :param int [limit]: the maximum number of trade structures to retrieve
        :param dict [params]: extra parameters specific to the exchange API endpoint
        :param str [params.method]: '/spotMarket/tradeOrders' or '/spot/tradeFills' default is '/spotMarket/tradeOrders'
        :returns dict[]: a list of `trade structures <https://docs.ccxt.com/#/?id=trade-structure>`
        """
        await self.load_markets()
        url = await self.negotiate(True)
        topic: Str = None
        topic, params = self.handle_option_and_params(params, 'watchMyTrades', 'method', '/spotMarket/tradeOrders')
        request: dict = {
            'privateChannel': True,
        }
        messageHash = 'myTrades'
        if symbol is not None:
            market = self.market(symbol)
            symbol = market['symbol']
            messageHash = messageHash + ':' + market['symbol']
        trades = await self.subscribe(url, messageHash, topic, self.extend(request, params))
        if self.newUpdates:
            limit = trades.getLimit(symbol, limit)
        return self.filter_by_symbol_since_limit(trades, symbol, since, limit, True)

    def handle_my_trade(self, client: Client, message):
        #
        #     {
        #         "type": "message",
        #         "topic": "/spotMarket/tradeOrders",
        #         "subject": "orderChange",
        #         "channelType": "private",
        #         "data": {
        #             "symbol": "KCS-USDT",
        #             "orderType": "limit",
        #             "side": "sell",
        #             "orderId": "5efab07953bdea00089965fa",
        #             "liquidity": "taker",
        #             "type": "match",
        #             "feeType": "takerFee",
        #             "orderTime": 1670329987026,
        #             "size": "0.1",
        #             "filledSize": "0.1",
        #             "price": "0.938",
        #             "matchPrice": "0.96738",
        #             "matchSize": "0.1",
        #             "tradeId": "5efab07a4ee4c7000a82d6d9",
        #             "clientOid": "1593487481000313",
        #             "remainSize": "0",
        #             "status": "match",
        #             "ts": 1670329987311000000
        #         }
        #     }
        #
        if self.myTrades is None:
            limit = self.safe_integer(self.options, 'tradesLimit', 1000)
            self.myTrades = ArrayCacheBySymbolById(limit)
        data = self.safe_dict(message, 'data')
        parsed = self.parse_ws_trade(data)
        myTrades = self.myTrades
        myTrades.append(parsed)
        messageHash = 'myTrades'
        client.resolve(self.myTrades, messageHash)
        symbolSpecificMessageHash = messageHash + ':' + parsed['symbol']
        client.resolve(self.myTrades, symbolSpecificMessageHash)

    def parse_ws_trade(self, trade, market=None):
        #
        # /spotMarket/tradeOrders
        #
        #     {
        #         "symbol": "KCS-USDT",
        #         "orderType": "limit",
        #         "side": "sell",
        #         "orderId": "5efab07953bdea00089965fa",
        #         "liquidity": "taker",
        #         "type": "match",
        #         "feeType": "takerFee",
        #         "orderTime": 1670329987026,
        #         "size": "0.1",
        #         "filledSize": "0.1",
        #         "price": "0.938",
        #         "matchPrice": "0.96738",
        #         "matchSize": "0.1",
        #         "tradeId": "5efab07a4ee4c7000a82d6d9",
        #         "clientOid": "1593487481000313",
        #         "remainSize": "0",
        #         "status": "match",
        #         "ts": 1670329987311000000
        #     }
        #
        # /spot/tradeFills
        #
        #    {
        #        "fee": 0.00262148,
        #        "feeCurrency": "USDT",
        #        "feeRate": 0.001,
        #        "orderId": "62417436b29df8000183df2f",
        #        "orderType": "market",
        #        "price": 131.074,
        #        "side": "sell",
        #        "size": 0.02,
        #        "symbol": "LTC-USDT",
        #        "time": "1648456758734571745",
        #        "tradeId": "624174362e113d2f467b3043"
        #    }
        #
        marketId = self.safe_string(trade, 'symbol')
        market = self.safe_market(marketId, market, '-')
        symbol = market['symbol']
        type = self.safe_string(trade, 'orderType')
        side = self.safe_string(trade, 'side')
        tradeId = self.safe_string(trade, 'tradeId')
        price = self.safe_string(trade, 'matchPrice')
        amount = self.safe_string(trade, 'matchSize')
        if price is None:
            # /spot/tradeFills
            price = self.safe_string(trade, 'price')
            amount = self.safe_string(trade, 'size')
        order = self.safe_string(trade, 'orderId')
        timestamp = self.safe_integer_product_2(trade, 'ts', 'time', 0.000001)
        feeCurrency = market['quote']
        feeRate = self.safe_string(trade, 'feeRate')
        feeCost = self.safe_string(trade, 'fee')
        return self.safe_trade({
            'info': trade,
            'timestamp': timestamp,
            'datetime': self.iso8601(timestamp),
            'symbol': symbol,
            'id': tradeId,
            'order': order,
            'type': type,
            'takerOrMaker': self.safe_string(trade, 'liquidity'),
            'side': side,
            'price': price,
            'amount': amount,
            'cost': None,
            'fee': {
                'cost': feeCost,
                'rate': feeRate,
                'currency': feeCurrency,
            },
        }, market)

    async def watch_balance(self, params={}) -> Balances:
        """
        watch balance and get the amount of funds available for trading or funds locked in orders

        https://www.kucoin.com/docs/websocket/spot-trading/private-channels/account-balance-change

        :param dict [params]: extra parameters specific to the exchange API endpoint
        :returns dict: a `balance structure <https://docs.ccxt.com/#/?id=balance-structure>`
        """
        await self.load_markets()
        url = await self.negotiate(True)
        topic = '/account/balance'
        request: dict = {
            'privateChannel': True,
        }
        messageHash = 'balance'
        return await self.subscribe(url, messageHash, topic, self.extend(request, params))

    def handle_balance(self, client: Client, message):
        #
        # {
        #     "id":"6217a451294b030001e3a26a",
        #     "type":"message",
        #     "topic":"/account/balance",
        #     "userId":"6217707c52f97f00012a67db",
        #     "channelType":"private",
        #     "subject":"account.balance",
        #     "data":{
        #        "accountId":"62177fe67810720001db2f18",
        #        "available":"89",
        #        "availableChange":"-30",
        #        "currency":"USDT",
        #        "hold":"0",
        #        "holdChange":"0",
        #        "relationContext":{
        #        },
        #        "relationEvent":"main.transfer",
        #        "relationEventId":"6217a451294b030001e3a26a",
        #        "time":"1645716561816",
        #        "total":"89"
        #     }
        #
        data = self.safe_value(message, 'data', {})
        messageHash = 'balance'
        currencyId = self.safe_string(data, 'currency')
        relationEvent = self.safe_string(data, 'relationEvent')
        requestAccountType = None
        if relationEvent is not None:
            relationEventParts = relationEvent.split('.')
            requestAccountType = self.safe_string(relationEventParts, 0)
        selectedType = self.safe_string_2(self.options, 'watchBalance', 'defaultType', 'trade')  # trade, main, margin or other
        accountsByType = self.safe_value(self.options, 'accountsByType')
        uniformType = self.safe_string(accountsByType, requestAccountType, 'trade')
        if not (uniformType in self.balance):
            self.balance[uniformType] = {}
        self.balance[uniformType]['info'] = data
        timestamp = self.safe_integer(data, 'time')
        self.balance[uniformType]['timestamp'] = timestamp
        self.balance[uniformType]['datetime'] = self.iso8601(timestamp)
        code = self.safe_currency_code(currencyId)
        account = self.account()
        account['free'] = self.safe_string(data, 'available')
        account['used'] = self.safe_string(data, 'hold')
        account['total'] = self.safe_string(data, 'total')
        self.balance[uniformType][code] = account
        self.balance[uniformType] = self.safe_balance(self.balance[uniformType])
        if uniformType == selectedType:
            client.resolve(self.balance[uniformType], messageHash)

    def handle_subject(self, client: Client, message):
        #
        #     {
        #         "type":"message",
        #         "topic":"/market/level2:BTC-USDT",
        #         "subject":"trade.l2update",
        #         "data":{
        #             "sequenceStart":1545896669105,
        #             "sequenceEnd":1545896669106,
        #             "symbol":"BTC-USDT",
        #             "changes": {
        #                 "asks": [["6","1","1545896669105"]],  # price, size, sequence
        #                 "bids": [["4","1","1545896669106"]]
        #             }
        #         }
        #     }
        #
        topic = self.safe_string(message, 'topic')
        if topic == '/market/ticker:all':
            self.handle_ticker(client, message)
            return
        subject = self.safe_string(message, 'subject')
        methods: dict = {
            'level1': self.handle_bid_ask,
            'level2': self.handle_order_book,
            'trade.l2update': self.handle_order_book,
            'trade.ticker': self.handle_ticker,
            'trade.snapshot': self.handle_ticker,
            'trade.l3match': self.handle_trade,
            'trade.candles.update': self.handle_ohlcv,
            'account.balance': self.handle_balance,
            'orderChange': self.handle_order,
            'stopOrder': self.handle_order,
            '/spot/tradeFills': self.handle_my_trade,
        }
        method = self.safe_value(methods, subject)
        if method is not None:
            method(client, message)

    def ping(self, client: Client):
        # kucoin does not support built-in ws protocol-level ping-pong
        # instead it requires a custom json-based text ping-pong
        # https://docs.kucoin.com/#ping
        id = str(self.request_id())
        return {
            'id': id,
            'type': 'ping',
        }

    def handle_pong(self, client: Client, message):
        client.lastPong = self.milliseconds()
        # https://docs.kucoin.com/#ping

    def handle_error_message(self, client: Client, message) -> Bool:
        #
        #    {
        #        "id": "1",
        #        "type": "error",
        #        "code": 415,
        #        "data": "type is not supported"
        #    }
        #
        data = self.safe_string(message, 'data', '')
        if data == 'token is expired':
            type = 'public'
            if client.url.find('connectId=private') >= 0:
                type = 'private'
            self.options['urls'][type] = None
        self.handle_errors(1, '', client.url, '', {}, data, message, {}, {})
        return False

    def handle_message(self, client: Client, message):
        type = self.safe_string(message, 'type')
        methods: dict = {
            # 'heartbeat': self.handleHeartbeat,
            'welcome': self.handle_system_status,
            'ack': self.handle_subscription_status,
            'message': self.handle_subject,
            'pong': self.handle_pong,
            'error': self.handle_error_message,
        }
        method = self.safe_value(methods, type)
        if method is not None:
            method(client, message)
