"""
This module contains the BFX rest client data types
"""

import asyncio
import aiohttp
import time
import json

from ..utils.CustomLogger import CustomLogger
from ..utils.auth import generate_auth_headers
from ..models import Wallet, Order, Position, Trade, FundingLoan, FundingOffer
from ..models import FundingCredit


class BfxRest:
    """
    BFX rest interface contains functions which are used to interact with both the public
    and private Bitfinex http api's.
    To use the private api you have to set the API_KEY and API_SECRET variables to your
    api key.
    """

    def __init__(self, API_KEY, API_SECRET, host='https://api.bitfinex.com/v2', loop=None,
                 logLevel='INFO', *args, **kwargs):
        self.loop = loop or asyncio.get_event_loop()
        self.API_KEY = API_KEY
        self.API_SECRET = API_SECRET
        self.host = host
        self.logger = CustomLogger('BfxRest', logLevel=logLevel)

    async def fetch(self, endpoint, params=""):
        """
        Fetch a GET request from the bitfinex host

        @return reponse
        """
        url = '{}/{}{}'.format(self.host, endpoint, params)
        async with aiohttp.ClientSession() as session:
            async with session.get(url) as resp:
                text = await resp.text()
                if resp.status is not 200:
                    raise Exception('GET {} failed with status {} - {}'
                                    .format(url, resp.status, text))
                return await resp.json()

    async def post(self, endpoint, data={}, params=""):
        """
        Request a POST to the bitfinex host

        @return response
        """
        url = '{}/{}'.format(self.host, endpoint)
        sData = json.dumps(data)
        headers = generate_auth_headers(
            self.API_KEY, self.API_SECRET, endpoint, sData)
        headers["content-type"] = "application/json"
        async with aiohttp.ClientSession() as session:
            async with session.post(url + params, headers=headers, data=sData) as resp:
                text = await resp.text()
                if resp.status is not 200:
                    raise Exception('POST {} failed with status {} - {}'
                                    .format(url, resp.status, text))
                return await resp.json()

    ##################################################
    #                  Public Data                   #
    ##################################################

    async def get_seed_candles(self, symbol, tf='1m'):
        """
        Used by the honey framework, this function gets the last 4k candles.
        """
        endpoint = 'candles/trade:{}:{}/hist?limit=5000&_bfx=1'.format(tf, symbol)
        time_difference = (1000 * 60) * 5000
        # get now to the nearest min
        now = int(round((time.time() // 60 * 60) * 1000))
        task_batch = []
        for x in range(0, 10):
            start = x * time_difference
            end = now - (x * time_difference) - time_difference
            e2 = endpoint + '&start={}&end={}'.format(start, end)
            task_batch += [asyncio.ensure_future(self.fetch(e2))]
        self.logger.info("Downloading seed candles from Bitfinex...")
        # call all fetch requests async
        done, _ = await asyncio.wait(*[task_batch])
        candles = []
        for task in done:
            candles += task.result()
        candles.sort(key=lambda x: x[0], reverse=True)
        self.logger.info("Downloaded {} candles.".format(len(candles)))
        return candles

    async def get_public_candles(self, symbol, start, end, section='hist',
                                 tf='1m', limit="100", sort=-1):
        """
        Get all of the public candles between the start and end period.

        @param symbol symbol string: pair symbol i.e tBTCUSD
        @param secton string: available values: "last", "hist"
        @param start int: millisecond start time
        @param end int: millisecond end time
        @param limit int: max number of items in response
        @param tf int: timeframe inbetween candles i.e 1m (min), ..., 1D (day), 
                      ... 1M (month)
        @param sort int: if = 1 it sorts results returned with old > new
        @return Array [ MTS, OPEN, CLOSE, HIGH, LOW, VOLUME ]
        """
        endpoint = "candles/trade:{}:{}/{}".format(tf, symbol, section)
        params = "?start={}&end={}&limit={}&sort={}".format(
            start, end, limit, sort)
        candles = await self.fetch(endpoint, params=params)
        return candles

    async def get_public_trades(self, symbol, start, end, limit="100", sort=-1):
        """
        Get all of the public trades between the start and end period.

        @param symbol symbol string: pair symbol i.e tBTCUSD
        @param start int: millisecond start time
        @param end int: millisecond end time
        @param limit int: max number of items in response
        @return Array [ ID, MTS, AMOUNT, RATE, PERIOD? ]
        """
        endpoint = "trades/{}/hist".format(symbol)
        params = "?start={}&end={}&limit={}&sort={}".format(
            start, end, limit, sort)
        trades = await self.fetch(endpoint, params=params)
        return trades

    async def get_public_books(self, symbol, precision="P0", length=25):
        """
        Get the public orderbook for a given symbol.

        @param symbol symbol string: pair symbol i.e tBTCUSD
        @param precision string: level of price aggregation (P0, P1, P2, P3, P4, R0)
        @param length int: number of price points ("25", "100")
        @return Array [ PRICE, COUNT, AMOUNT ]
        """
        endpoint = "book/{}/{}".format(symbol, precision)
        params = "?len={}".format(length)
        books = await self.fetch(endpoint, params)
        return books

    async def get_public_ticker(self, symbol):
        """
        Get tickers for the given symbol. Tickers shows you the current best bid and ask,
        as well as the last trade price.

        @parms symbols symbol string: pair symbol i.e tBTCUSD
        @return Array [ SYMBOL, BID, BID_SIZE, ASK, ASK_SIZE, DAILY_CHANGE,
          DAILY_CHANGE_PERC, LAST_PRICE, VOLUME, HIGH, LOW ]
        """
        endpoint = "ticker/{}".format(symbol)
        ticker = await self.fetch(endpoint)
        return ticker

    async def get_public_tickers(self, symbols):
        """
        Get tickers for the given symbols. Tickers shows you the current best bid and ask,
        as well as the last trade price.

        @parms symbols Array<string>: array of symbols i.e [tBTCUSD, tETHUSD]
        @return Array [ SYMBOL, BID, BID_SIZE, ASK, ASK_SIZE, DAILY_CHANGE,  DAILY_CHANGE_PERC,
          LAST_PRICE, VOLUME, HIGH, LOW ]
        """
        endpoint = "tickers/?symbols={}".format(','.join(symbols))
        ticker = await self.fetch(endpoint)
        return ticker

    ##################################################
    #               Authenticated Data               #
    ##################################################

    async def get_wallets(self):
        """
        Get all wallets on account associated with API_KEY - Requires authentication.

        @return Array <models.Wallet>
        """
        endpoint = "auth/r/wallets"
        raw_wallets = await self.post(endpoint)
        return [Wallet(*rw[:4]) for rw in raw_wallets]

    async def get_active_orders(self, symbol):
        """
        Get all of the active orders associated with API_KEY - Requires authentication.

        @param symbol string: pair symbol i.e tBTCUSD
        @return Array <models.Order>
        """
        endpoint = "auth/r/orders/{}".format(symbol)
        raw_orders = await self.post(endpoint)
        return [Order.from_raw_order(ro) for ro in raw_orders]

    async def get_order_history(self, symbol, start, end, limit=25, sort=-1):
        """
        Get all of the orders between the start and end period associated with API_KEY
        - Requires authentication.

        @param symbol string: pair symbol i.e tBTCUSD
        @param start int: millisecond start time
        @param end int: millisecond end time
        @param limit int: max number of items in response
        @return Array <models.Order>
        """
        endpoint = "auth/r/orders/{}/hist".format(symbol)
        params = "?start={}&end={}&limit={}&sort={}".format(
            start, end, limit, sort)
        raw_orders = await self.post(endpoint, params=params)
        return [Order.from_raw_order(ro) for ro in raw_orders]

    async def get_active_position(self):
        """
        Get all of the active position associated with API_KEY - Requires authentication.

        @return Array <models.Position>
        """
        endpoint = "auth/r/positions"
        raw_positions = await self.post(endpoint)
        return [Position.from_raw_rest_position(rp) for rp in raw_positions]

    async def get_order_trades(self, symbol, order_id):
        """
        Get all of the trades that have been generated by the given order associated with API_KEY
        - Requires authentication.

        @param symbol string: pair symbol i.e tBTCUSD
        @param order_id string: id of the order
        @return Array <models.Trade>
        """
        endpoint = "auth/r/order/{}:{}/trades".format(symbol, order_id)
        raw_trades = await self.post(endpoint)
        return [Trade.from_raw_rest_trade(rt) for rt in raw_trades]

    async def get_trades(self, symbol, start, end, limit=25):
        """
        Get all of the trades between the start and end period associated with API_KEY
        - Requires authentication.

        @param symbol string: pair symbol i.e tBTCUSD
        @param start int: millisecond start time
        @param end int: millisecond end time
        @param limit int: max number of items in response
        @return Array <models.Trade>
        """
        endpoint = "auth/r/trades/{}/hist".format(symbol)
        params = "?start={}&end={}&limit={}".format(start, end, limit)
        raw_trades = await self.post(endpoint, params=params)
        return [Trade.from_raw_rest_trade(rt) for rt in raw_trades]

    async def get_funding_offers(self, symbol):
        """
        Get all of the funding offers associated with API_KEY - Requires authentication.

        @return Array <models.FundingOffer>
        """
        endpoint = "auth/r/funding/offers/{}".format(symbol)
        offers = await self.post(endpoint)
        return [FundingOffer.from_raw_offer(o) for o in offers]

    async def get_funding_offer_history(self, symbol, start, end, limit=25):
        """
        Get all of the funding offers between the start and end period associated with API_KEY
        - Requires authentication.

        @param symbol string: pair symbol i.e tBTCUSD
        @param start int: millisecond start time
        @param end int: millisecond end time
        @param limit int: max number of items in response
        @return Array <models.FundingOffer>
        """
        endpoint = "auth/r/funding/offers/{}/hist".format(symbol)
        params = "?start={}&end={}&limit={}".format(start, end, limit)
        offers = await self.post(endpoint, params=params)
        return [FundingOffer.from_raw_offer(o) for o in offers]

    async def get_funding_loans(self, symbol):
        """
        Get all of the funding loans associated with API_KEY - Requires authentication.

        @return Array <models.FundingLoan>
        """
        endpoint = "auth/r/funding/loans/{}".format(symbol)
        loans = await self.post(endpoint)
        return [FundingLoan.from_raw_loan(o) for o in loans]

    async def get_funding_loan_history(self, symbol, start, end, limit=25):
        """
        Get all of the funding loans between the start and end period associated with API_KEY
        - Requires authentication.

        @param symbol string: pair symbol i.e tBTCUSD
        @param start int: millisecond start time
        @param end int: millisecond end time
        @param limit int: max number of items in response
        @return Array <models.FundingLoan>
        """
        endpoint = "auth/r/funding/loans/{}/hist".format(symbol)
        params = "?start={}&end={}&limit={}".format(start, end, limit)
        loans = await self.post(endpoint, params=params)
        return [FundingLoan.from_raw_loan(o) for o in loans]

    async def get_funding_credits(self, symbol):
        endpoint = "auth/r/funding/credits/{}".format(symbol)
        credits = await self.post(endpoint)
        return [FundingCredit.from_raw_credit(c) for c in credits]

    async def get_funding_credit_history(self, symbol, start, end, limit=25):
        """
        Get all of the funding credits between the start and end period associated with API_KEY
        - Requires authentication.

        @param symbol string: pair symbol i.e tBTCUSD
        @param start int: millisecond start time
        @param end int: millisecond end time
        @param limit int: max number of items in response
        @return Array <models.FundingCredit>
        """
        endpoint = "auth/r/funding/credits/{}/hist".format(symbol)
        params = "?start={}&end={}&limit={}".format(start, end, limit)
        credits = await self.post(endpoint, params=params)
        return [FundingCredit.from_raw_credit(c) for c in credits]

    ##################################################
    #                     Orders                     #
    ##################################################

    async def __submit_order(self, symbol, amount, price, oType=Order.Type.LIMIT,
                             is_hidden=False, is_postonly=False, use_all_available=False,
                             stop_order=False, stop_buy_price=0, stop_sell_price=0):
        """
        Submit a new order

        @param symbol: the name of the symbol i.e 'tBTCUSD
        @param amount: order size: how much you want to buy/sell,
          a negative amount indicates a sell order and positive a buy order
        @param price: the price you want to buy/sell at (must be positive)
        @param oType: order type, see Order.Type enum
        @param is_hidden: True if order should be hidden from orderbooks
        @param is_postonly: True if should be post only. Only relevant for limit
        @param use_all_available: True if order should use entire balance
        @param stop_order: True to set an additional STOP OCO order linked to the
          current order
        @param stop_buy_price: set the OCO stop buy price (requires stop_order True)
        @param stop_sell_price: set the OCO stop sell price (requires stop_order True)
        """
        raise NotImplementedError(
            "V2 submit order has not yet been added to the bfx api. Please use bfxapi.ws")
        side = Order.Side.SELL if amount < 0 else Order.Side.BUY
        use_all_balance = 1 if use_all_available else 0
        payload = {}
        payload['symbol'] = symbol
        payload['amount'] = abs(amount)
        payload['price'] = price
        payload['side'] = side
        payload['type'] = oType
        payload['is_hidden'] = is_hidden
        payload['is_postonly'] = is_postonly
        payload['use_all_available'] = use_all_balance
        payload['ocoorder'] = stop_order
        if stop_order:
            payload['buy_price_oco'] = stop_buy_price
            payload['sell_price_oco'] = stop_sell_price
        endpoint = 'order/new'
        return await self.post(endpoint, data=payload)