import logging
from abc import ABC, abstractmethod, abstractproperty
from datetime import datetime, timedelta, timezone
from typing import Any, Dict, List, Optional, Tuple

from freqtrade.mixins import LoggingMixin
from freqtrade.persistence import Trade


logger = logging.getLogger(__name__)

ProtectionReturn = Tuple[bool, Optional[datetime], Optional[str]]


class IProtection(LoggingMixin, ABC):

    # Can globally stop the bot
    has_global_stop: bool = False
    # Can stop trading for one pair
    has_local_stop: bool = False

    def __init__(self, config: Dict[str, Any], protection_config: Dict[str, Any]) -> None:
        self._config = config
        self._protection_config = protection_config
        LoggingMixin.__init__(self, logger)

    @property
    def name(self) -> str:
        return self.__class__.__name__

    @abstractmethod
    def short_desc(self) -> str:
        """
        Short method description - used for startup-messages
        -> Please overwrite in subclasses
        """

    @abstractmethod
    def global_stop(self, date_now: datetime) -> ProtectionReturn:
        """
        Stops trading (position entering) for all pairs
        This must evaluate to true for the whole period of the "cooldown period".
        """

    @abstractmethod
    def stop_per_pair(self, pair: str, date_now: datetime) -> 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>
        """

    @staticmethod
    def calculate_lock_end(trades: List[Trade], stop_minutes: int) -> datetime:
        """
        Get lock end time
        """
        max_date: datetime = max([trade.close_date for trade in trades])
        # comming from Database, tzinfo is not set.
        if max_date.tzinfo is None:
            max_date = max_date.replace(tzinfo=timezone.utc)

        until = max_date + timedelta(minutes=stop_minutes)

        return until