"""
A Rest Client for Freqtrade bot

Should not import anything from freqtrade,
so it can be used as a standalone script, and can be installed independently.
"""

import json
import logging
from typing import Optional
from urllib.parse import urlencode, urlparse, urlunparse

import requests
from requests.exceptions import ConnectionError


logger = logging.getLogger("ft_rest_client")


class FtRestClient:

    def __init__(self, serverurl, username=None, password=None, *,
                 pool_connections=10, pool_maxsize=10):

        self._serverurl = serverurl
        self._session = requests.Session()

        # allow configuration of pool
        adapter = requests.adapters.HTTPAdapter(
            pool_connections=pool_connections,
            pool_maxsize=pool_maxsize
        )
        self._session.mount('http://', adapter)

        self._session.auth = (username, password)

    def _call(self, method, apipath, params: Optional[dict] = None, data=None, files=None):

        if str(method).upper() not in ('GET', 'POST', 'PUT', 'DELETE'):
            raise ValueError(f'invalid method <{method}>')
        basepath = f"{self._serverurl}/api/v1/{apipath}"

        hd = {"Accept": "application/json",
              "Content-Type": "application/json"
              }

        # Split url
        schema, netloc, path, par, query, fragment = urlparse(basepath)
        # URLEncode query string
        query = urlencode(params) if params else ""
        # recombine url
        url = urlunparse((schema, netloc, path, par, query, fragment))

        try:
            resp = self._session.request(method, url, headers=hd, data=json.dumps(data))
            # return resp.text
            return resp.json()
        except ConnectionError:
            logger.warning("Connection error")

    def _get(self, apipath, params: Optional[dict] = None):
        return self._call("GET", apipath, params=params)

    def _delete(self, apipath, params: Optional[dict] = None):
        return self._call("DELETE", apipath, params=params)

    def _post(self, apipath, params: Optional[dict] = None, data: Optional[dict] = None):
        return self._call("POST", apipath, params=params, data=data)

    def start(self):
        """Start the bot if it's in the stopped state.

        :return: json object
        """
        return self._post("start")

    def stop(self):
        """Stop the bot. Use `start` to restart.

        :return: json object
        """
        return self._post("stop")

    def stopbuy(self):
        """Stop buying (but handle sells gracefully). Use `reload_config` to reset.

        :return: json object
        """
        return self._post("stopbuy")

    def reload_config(self):
        """Reload configuration.

        :return: json object
        """
        return self._post("reload_config")

    def balance(self):
        """Get the account balance.

        :return: json object
        """
        return self._get("balance")

    def count(self):
        """Return the amount of open trades.

        :return: json object
        """
        return self._get("count")

    def entries(self, pair=None):
        """Returns List of dicts containing all Trades, based on buy tag performance
        Can either be average for all pairs or a specific pair provided

        :return: json object
        """
        return self._get("entries", params={"pair": pair} if pair else None)

    def exits(self, pair=None):
        """Returns List of dicts containing all Trades, based on exit reason performance
        Can either be average for all pairs or a specific pair provided

        :return: json object
        """
        return self._get("exits", params={"pair": pair} if pair else None)

    def mix_tags(self, pair=None):
        """Returns List of dicts containing all Trades, based on entry_tag + exit_reason performance
        Can either be average for all pairs or a specific pair provided

        :return: json object
        """
        return self._get("mix_tags", params={"pair": pair} if pair else None)

    def locks(self):
        """Return current locks

        :return: json object
        """
        return self._get("locks")

    def delete_lock(self, lock_id):
        """Delete (disable) lock from the database.

        :param lock_id: ID for the lock to delete
        :return: json object
        """
        return self._delete(f"locks/{lock_id}")

    def daily(self, days=None):
        """Return the profits for each day, and amount of trades.

        :return: json object
        """
        return self._get("daily", params={"timescale": days} if days else None)

    def weekly(self, weeks=None):
        """Return the profits for each week, and amount of trades.

        :return: json object
        """
        return self._get("weekly", params={"timescale": weeks} if weeks else None)

    def monthly(self, months=None):
        """Return the profits for each month, and amount of trades.

        :return: json object
        """
        return self._get("monthly", params={"timescale": months} if months else None)

    def edge(self):
        """Return information about edge.

        :return: json object
        """
        return self._get("edge")

    def profit(self):
        """Return the profit summary.

        :return: json object
        """
        return self._get("profit")

    def stats(self):
        """Return the stats report (durations, sell-reasons).

        :return: json object
        """
        return self._get("stats")

    def performance(self):
        """Return the performance of the different coins.

        :return: json object
        """
        return self._get("performance")

    def status(self):
        """Get the status of open trades.

        :return: json object
        """
        return self._get("status")

    def version(self):
        """Return the version of the bot.

        :return: json object containing the version
        """
        return self._get("version")

    def show_config(self):
        """ Returns part of the configuration, relevant for trading operations.
        :return: json object containing the version
        """
        return self._get("show_config")

    def ping(self):
        """simple ping"""
        configstatus = self.show_config()
        if not configstatus:
            return {"status": "not_running"}
        elif configstatus['state'] == "running":
            return {"status": "pong"}
        else:
            return {"status": "not_running"}

    def logs(self, limit=None):
        """Show latest logs.

        :param limit: Limits log messages to the last <limit> logs. No limit to get the entire log.
        :return: json object
        """
        return self._get("logs", params={"limit": limit} if limit else 0)

    def trades(self, limit=None, offset=None):
        """Return trades history, sorted by id

        :param limit: Limits trades to the X last trades. Max 500 trades.
        :param offset: Offset by this amount of trades.
        :return: json object
        """
        params = {}
        if limit:
            params['limit'] = limit
        if offset:
            params['offset'] = offset
        return self._get("trades", params)

    def trade(self, trade_id):
        """Return specific trade

        :param trade_id: Specify which trade to get.
        :return: json object
        """
        return self._get(f"trade/{trade_id}")

    def delete_trade(self, trade_id):
        """Delete trade from the database.
        Tries to close open orders. Requires manual handling of this asset on the exchange.

        :param trade_id: Deletes the trade with this ID from the database.
        :return: json object
        """
        return self._delete(f"trades/{trade_id}")

    def cancel_open_order(self, trade_id):
        """Cancel open order for trade.

        :param trade_id: Cancels open orders for this trade.
        :return: json object
        """
        return self._delete(f"trades/{trade_id}/open-order")

    def whitelist(self):
        """Show the current whitelist.

        :return: json object
        """
        return self._get("whitelist")

    def blacklist(self, *args):
        """Show the current blacklist.

        :param add: List of coins to add (example: "BNB/BTC")
        :return: json object
        """
        if not args:
            return self._get("blacklist")
        else:
            return self._post("blacklist", data={"blacklist": args})

    def forcebuy(self, pair, price=None):
        """Buy an asset.

        :param pair: Pair to buy (ETH/BTC)
        :param price: Optional - price to buy
        :return: json object of the trade
        """
        data = {"pair": pair,
                "price": price
                }
        return self._post("forcebuy", data=data)

    def forceenter(self, pair, side, price=None):
        """Force entering a trade

        :param pair: Pair to buy (ETH/BTC)
        :param side: 'long' or 'short'
        :param price: Optional - price to buy
        :return: json object of the trade
        """
        data = {"pair": pair,
                "side": side,
                }
        if price:
            data['price'] = price
        return self._post("forceenter", data=data)

    def forceexit(self, tradeid, ordertype=None, amount=None):
        """Force-exit a trade.

        :param tradeid: Id of the trade (can be received via status command)
        :param ordertype: Order type to use (must be market or limit)
        :param amount: Amount to sell. Full sell if not given
        :return: json object
        """

        return self._post("forceexit", data={
            "tradeid": tradeid,
            "ordertype": ordertype,
            "amount": amount,
            })

    def strategies(self):
        """Lists available strategies

        :return: json object
        """
        return self._get("strategies")

    def strategy(self, strategy):
        """Get strategy details

        :param strategy: Strategy class name
        :return: json object
        """
        return self._get(f"strategy/{strategy}")

    def pairlists_available(self):
        """Lists available pairlist providers

        :return: json object
        """
        return self._get("pairlists/available")

    def plot_config(self):
        """Return plot configuration if the strategy defines one.

        :return: json object
        """
        return self._get("plot_config")

    def available_pairs(self, timeframe=None, stake_currency=None):
        """Return available pair (backtest data) based on timeframe / stake_currency selection

        :param timeframe: Only pairs with this timeframe available.
        :param stake_currency: Only pairs that include this timeframe
        :return: json object
        """
        return self._get("available_pairs", params={
            "stake_currency": stake_currency if timeframe else '',
            "timeframe": timeframe if timeframe else '',
        })

    def pair_candles(self, pair, timeframe, limit=None):
        """Return live dataframe for <pair><timeframe>.

        :param pair: Pair to get data for
        :param timeframe: Only pairs with this timeframe available.
        :param limit: Limit result to the last n candles.
        :return: json object
        """
        params = {
            "pair": pair,
            "timeframe": timeframe,
        }
        if limit:
            params['limit'] = limit
        return self._get("pair_candles", params=params)

    def pair_history(self, pair, timeframe, strategy, timerange=None, freqaimodel=None):
        """Return historic, analyzed dataframe

        :param pair: Pair to get data for
        :param timeframe: Only pairs with this timeframe available.
        :param strategy: Strategy to analyze and get values for
        :param freqaimodel: FreqAI model to use for analysis
        :param timerange: Timerange to get data for (same format than --timerange endpoints)
        :return: json object
        """
        return self._get("pair_history", params={
            "pair": pair,
            "timeframe": timeframe,
            "strategy": strategy,
            "freqaimodel": freqaimodel,
            "timerange": timerange if timerange else '',
        })

    def sysinfo(self):
        """Provides system information (CPU, RAM usage)

        :return: json object
        """
        return self._get("sysinfo")

    def health(self):
        """Provides a quick health check of the running bot.

        :return: json object
        """
        return self._get("health")