import logging
from datetime import datetime, timedelta
from typing import Any, Dict, Optional

from freqtrade.enums import ExitType
from freqtrade.persistence import Trade
from freqtrade.plugins.protections import IProtection, ProtectionReturn


logger = logging.getLogger(__name__)


class StoplossGuard(IProtection):

    has_global_stop: bool = True
    has_local_stop: bool = True

    def __init__(self, config: Dict[str, Any], protection_config: Dict[str, Any]) -> None:
        super().__init__(config, protection_config)

        self._trade_limit = protection_config.get('trade_limit', 10)
        self._disable_global_stop = protection_config.get('only_per_pair', False)
        self._only_per_side = protection_config.get('only_per_side', False)

    def short_desc(self) -> str:
        """
        Short method description - used for startup-messages
        """
        return (f"{self.name} - Frequent Stoploss Guard, {self._trade_limit} stoplosses "
                f"within {self.lookback_period_str}.")

    def _reason(self) -> str:
        """
        LockReason to use
        """
        return (f'{self._trade_limit} stoplosses in {self._lookback_period} min, '
                f'locking for {self._stop_duration} min.')

    def _stoploss_guard(
            self, date_now: datetime, pair: Optional[str], side: str) -> Optional[ProtectionReturn]:
        """
        Evaluate recent trades
        """
        look_back_until = date_now - timedelta(minutes=self._lookback_period)

        trades1 = Trade.get_trades_proxy(pair=pair, is_open=False, close_date=look_back_until)
        trades = [trade for trade in trades1 if (str(trade.exit_reason) in (
            ExitType.TRAILING_STOP_LOSS.value, ExitType.STOP_LOSS.value,
            ExitType.STOPLOSS_ON_EXCHANGE.value)
            and trade.close_profit and trade.close_profit < 0)]

        if self._only_per_side and side:
            # Long or short trades only
            trades = [trade for trade in trades if trade.trade_direction == side]

        if len(trades) < self._trade_limit:
            return None

        self.log_once(f"Trading stopped due to {self._trade_limit} "
                      f"stoplosses within {self._lookback_period} minutes.", logger.info)
        until = self.calculate_lock_end(trades, self._stop_duration)
        return ProtectionReturn(
            lock=True,
            until=until,
            reason=self._reason(),
            lock_side=(side if self._only_per_side else None)
            )

    def global_stop(self, date_now: datetime, side: str) -> Optional[ProtectionReturn]:
        """
        Stops trading (position entering) for all pairs
        This must evaluate to true for the whole period of the "cooldown period".
        :return: Tuple of [bool, until, reason].
            If true, all pairs will be locked with <reason> until <until>
        """
        if self._disable_global_stop:
            return None
        return self._stoploss_guard(date_now, None, side)

    def stop_per_pair(self, pair: str, date_now: datetime, side: str) -> Optional[ProtectionReturn]:
        """
        Stops trading (position entering) for this pair
        This must evaluate to true for the whole period of the "cooldown period".
        :return: Tuple of [bool, until, reason].
            If true, this pair will be locked with <reason> until <until>
        """
        return self._stoploss_guard(date_now, pair, side)