import ccxt
import decimal

def exchange_sum(self, *args):
    return sum([arg for arg in args if isinstance(arg, (float, int, decimal.Decimal))])
ccxt.Exchange.sum = exchange_sum

def poloniex_fetch_balance(self, params={}):
    self.load_markets()
    balances = self.privatePostReturnCompleteBalances(self.extend({
        'account': 'all',
        }, params))
    result = {'info': balances}
    currencies = list(balances.keys())
    for c in range(0, len(currencies)):
        id = currencies[c]
        balance = balances[id]
        currency = self.common_currency_code(id)
        account = {
                'free': decimal.Decimal(balance['available']),
                'used': decimal.Decimal(balance['onOrders']),
                'total': decimal.Decimal(0.0),
                }
        account['total'] = self.sum(account['free'], account['used'])
        result[currency] = account
    return self.parse_balance(result)
ccxt.poloniex.fetch_balance = poloniex_fetch_balance

def poloniex_fetch_margin_balance(self):
    """
    portfolio.market.privatePostGetMarginPosition({"currencyPair": "BTC_DASH"})
    See DASH/BTC positions
    {'amount': '-0.10000000',          -> DASH empruntés
     'basePrice': '0.06818560',        -> à ce prix là (0.06828800 demandé * (1-0.15%))
     'lendingFees': '0.00000000',      -> ce que je dois à mon créditeur
     'liquidationPrice': '0.15107132', -> prix auquel ça sera liquidé (dépend de ce que j’ai déjà sur mon compte margin)
     'pl': '-0.00000371',              -> plus-value latente si je rachète tout de suite (négatif = perdu)
     'total': '0.00681856',            -> valeur totale empruntée en BTC
     'type': 'short'}
    """
    positions = self.privatePostGetMarginPosition({"currencyPair": "all"})
    parsed = {}
    for symbol, position in positions.items():
        if position["type"] == "none":
            continue
        base_currency, currency = symbol.split("_")
        parsed[currency] = {
                "amount": decimal.Decimal(position["amount"]),
                "borrowedPrice": decimal.Decimal(position["basePrice"]),
                "lendingFees": decimal.Decimal(position["lendingFees"]),
                "pl": decimal.Decimal(position["pl"]),
                "liquidationPrice": decimal.Decimal(position["liquidationPrice"]),
                "type": position["type"],
                "total": decimal.Decimal(position["total"]),
                "baseCurrency": base_currency, 
                }
    return parsed
ccxt.poloniex.fetch_margin_balance = poloniex_fetch_margin_balance

def poloniex_fetch_balance_per_type(self):
    balances = self.privatePostReturnAvailableAccountBalances()
    result = {'info': balances}
    for key, balance in balances.items():
        result[key] = {}
        for currency, amount in balance.items():
            if currency not in result:
                result[currency] = {}
            result[currency][key] = decimal.Decimal(amount)
            result[key][currency] = decimal.Decimal(amount)
    return result
ccxt.poloniex.fetch_balance_per_type = poloniex_fetch_balance_per_type

def poloniex_fetch_all_balances(self):
    exchange_balances = self.fetch_balance()
    margin_balances = self.fetch_margin_balance()
    balances_per_type = self.fetch_balance_per_type()

    all_balances = {}
    in_positions = {}

    for currency, exchange_balance in exchange_balances.items():
        if currency in ["info", "free", "used", "total"]:
            continue

        margin_balance = margin_balances.get(currency, {})
        balance_per_type = balances_per_type.get(currency, {})

        all_balances[currency] = {
            "total": exchange_balance["total"] + margin_balance.get("amount", 0),
            "exchange_used": exchange_balance["used"],
            "exchange_total": exchange_balance["total"] - balance_per_type.get("margin", 0),
            "exchange_free": exchange_balance["free"] - balance_per_type.get("margin", 0),
            "margin_free": balance_per_type.get("margin", 0) + margin_balance.get("amount", 0),
            "margin_borrowed": 0,
            "margin_total": balance_per_type.get("margin", 0) + margin_balance.get("amount", 0),
            "margin_lending_fees": margin_balance.get("lendingFees", 0),
            "margin_pending_gain": margin_balance.get("pl", 0),
            "margin_position_type": margin_balance.get("type", None),
            "margin_liquidation_price": margin_balance.get("liquidationPrice", 0),
            "margin_borrowed_base_price": margin_balance.get("total", 0),
            "margin_borrowed_base_currency": margin_balance.get("baseCurrency", None),
            }
        if len(margin_balance) > 0:
            if margin_balance["baseCurrency"] not in in_positions:
                in_positions[margin_balance["baseCurrency"]] = 0
            in_positions[margin_balance["baseCurrency"]] += margin_balance["total"]

    for currency, in_position in in_positions.items():
        all_balances[currency]["total"] += in_position
        all_balances[currency]["margin_total"] += in_position
        all_balances[currency]["margin_borrowed"] += in_position

    return all_balances
ccxt.poloniex.fetch_all_balances = poloniex_fetch_all_balances

def poloniex_parse_ticker(self, ticker, market=None):
    timestamp = self.milliseconds()
    symbol = None
    if market:
        symbol = market['symbol']
    return {
        'symbol': symbol,
        'timestamp': timestamp,
        'datetime': self.iso8601(timestamp),
        'high': decimal.Decimal(ticker['high24hr']),
        'low': decimal.Decimal(ticker['low24hr']),
        'bid': decimal.Decimal(ticker['highestBid']),
        'ask': decimal.Decimal(ticker['lowestAsk']),
        'vwap': None,
        'open': None,
        'close': None,
        'first': None,
        'last': decimal.Decimal(ticker['last']),
        'change': decimal.Decimal(ticker['percentChange']),
        'percentage': None,
        'average': None,
        'baseVolume': decimal.Decimal(ticker['quoteVolume']),
        'quoteVolume': decimal.Decimal(ticker['baseVolume']),
        'info': ticker,
    }
ccxt.poloniex.parse_ticker = poloniex_parse_ticker

def poloniex_create_margin_order(self, symbol, type, side, amount, price=None, lending_rate=None, params={}):
    if type == 'market':
        raise ccxt.ExchangeError(self.id + ' allows limit orders only')
    self.load_markets()
    method = 'privatePostMargin' + self.capitalize(side)
    market = self.market(symbol)
    price = float(price)
    amount = float(amount)
    if lending_rate is not None:
        params = self.extend({"lendingRate": lending_rate}, params)
    response = getattr(self, method)(self.extend({
        'currencyPair': market['id'],
        'rate': self.price_to_precision(symbol, price),
        'amount': self.amount_to_precision(symbol, amount),
    }, params))
    timestamp = self.milliseconds()
    order = self.parse_order(self.extend({
        'timestamp': timestamp,
        'status': 'open',
        'type': type,
        'side': side,
        'price': price,
        'amount': amount,
    }, response), market)
    id = order['id']
    self.orders[id] = order
    return self.extend({'info': response}, order)
ccxt.poloniex.create_margin_order = poloniex_create_margin_order

def poloniex_create_order(self, symbol, type, side, amount, price=None, account="exchange", lending_rate=None, params={}):
    if account == "exchange":
        return self.create_exchange_order(symbol, type, side, amount, price=price, params=params)
    elif account == "margin":
        return self.create_margin_order(symbol, type, side, amount, price=price, lending_rate=lending_rate, params=params)
    else:
        raise NotImplementedError

def poloniex_order_precision(self, symbol):
    return 8

ccxt.poloniex.create_exchange_order = ccxt.poloniex.create_order
ccxt.poloniex.create_order = poloniex_create_order
ccxt.poloniex.order_precision = poloniex_order_precision

def poloniex_transfer_balance(self, currency, amount, from_account, to_account):
    result = self.privatePostTransferBalance({
        "currency": currency,
        "amount": amount,
        "fromAccount": from_account,
        "toAccount": to_account,
        "confirmed": 1})
    return result["success"] == 1
ccxt.poloniex.transfer_balance = poloniex_transfer_balance

def poloniex_close_margin_position(self, currency, base_currency):
    """
    closeMarginPosition({"currencyPair": "BTC_DASH"})
    fermer la position au prix du marché
    """
    symbol = "{}_{}".format(base_currency, currency)
    self.privatePostCloseMarginPosition({"currencyPair": symbol})
ccxt.poloniex.close_margin_position = poloniex_close_margin_position

def poloniex_tradable_balances(self):
    """
    portfolio.market.privatePostReturnTradableBalances()
    Returns tradable balances in margin
    'BTC_DASH': {'BTC': '0.01266999', 'DASH': '0.08574839'},
    Je peux emprunter jusqu’à 0.08574839 DASH ou 0.01266999 BTC (une position est déjà ouverte)
    'BTC_CLAM': {'BTC': '0.00585143', 'CLAM': '7.79300395'},
    Je peux emprunter 7.7 CLAM pour les vendre contre des BTC, ou emprunter 0.00585143 BTC pour acheter des CLAM
    """

    tradable_balances = self.privatePostReturnTradableBalances()
    for symbol, balances in tradable_balances.items():
        for currency, balance in balances.items():
            balances[currency] = decimal.Decimal(balance)
    return tradable_balances
ccxt.poloniex.fetch_tradable_balances = poloniex_tradable_balances

def poloniex_margin_summary(self):
    """
    portfolio.market.privatePostReturnMarginAccountSummary()
    Returns current informations for margin
    {'currentMargin': '1.49680968',      -> marge (ne doit pas descendre sous 20% / 0.2)
                                            = netValue / totalBorrowedValue
     'lendingFees': '0.00000000',        -> fees totaux
     'netValue': '0.01008254',           -> balance + plus-value
     'pl': '0.00008254',                 -> plus value latente (somme des positions)
     'totalBorrowedValue': '0.00673602', -> valeur en BTC empruntée
     'totalValue': '0.01000000'}         -> valeur totale en compte
    """
    summary = self.privatePostReturnMarginAccountSummary()

    return {
            "current_margin": decimal.Decimal(summary["currentMargin"]),
            "lending_fees": decimal.Decimal(summary["lendingFees"]),
            "gains": decimal.Decimal(summary["pl"]),
            "total_borrowed": decimal.Decimal(summary["totalBorrowedValue"]),
            "total": decimal.Decimal(summary["totalValue"]),
            }
ccxt.poloniex.margin_summary = poloniex_margin_summary
market = ccxt.poloniex({
    "apiKey": "XXXXXXXX-XXXXXXXX-XXXXXXXX-XXXXXXXX",
    "secret": "1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef",
    })