import abc

from botocore.exceptions import ClientError

from lib_b2b.order_status import OrderStatus
from lib_b2b.policy import Policy
from lib_b2b.errors import OrderStatusChangeError, VersionConflictError
from lib_b2b.change import ChangeRecord, ChangeDataProvider
from lib_b2b.order_change import OrderChangeRequest, SimpleOrderPredicate, OrderStatusChangeDataProvider
from lib_b2b.order import Order
from datetime import datetime
import logging

logger = logging.getLogger(__name__)


class OrderClearErrorsChangeDataProvider(ChangeDataProvider, metaclass=abc.ABCMeta):
    @property
    @abc.abstractmethod
    def clear_errors(self) -> bool:
        raise NotImplementedError


class OrderClearErrorsChangeRequest(OrderChangeRequest):
    """
    *** This should be an admin only change request and not part of the integration ***
    """
    # TODO: - Move these policies to be data driven
    _policy = Policy(
        name='clear_errors_change_policy',
        subject=Policy.SUBJECT_ALL,
        predicates=[
            SimpleOrderPredicate(
                lambda o: o.status < OrderStatus.SHIPPED,
                'The errors can only be cleared until the order has shipped.')
        ]
    )

    def __init__(self, on_behalf_of: str, change_data_provider: OrderClearErrorsChangeDataProvider):
        super().__init__(on_behalf_of, OrderClearErrorsChangeRequest._policy)
        self.change_data_provider = change_data_provider

    def will_change(self, order: Order) -> bool:
        _errors = order.get('errors', [])
        _warnings = order.get('warnings', [])
        return len(_errors) > 0 or len(_warnings) > 0

    def apply(self, order: Order):
        try:
            self.changeable_object = order
            if super().permitted(order):
                if self.will_change(order):
                    _before = {
                        'errors': order.get('errors', []),
                        'warnings': order.get('warnings', [])
                    }
                    order._clear_errors_and_warnings()
                    _after = {
                        'errors': order.get('errors', []),
                        'warnings': order.get('warnings', [])
                    }
                    order.record(
                        ChangeRecord(before=_before,
                                     after=_after,
                                     description=f"Errors and warnings were cleared on the order.",
                                     when=datetime.now().astimezone(UTC),
                                     who=self.on_behalf_of)
                    )
        except ValueError as ve:
            raise VersionConflictError(str(ve))
        except ClientError as ce:
            # order.error(ErrorRecord(code="ORDER-11",
            #                         msg=f"Order accept failed due to client error. [{str(ce)}]"))
            logger.error(f"Unable to clear errors and warnings order due to client error. [{str(ce)}]")
            raise OrderStatusChangeError("Unable to lear errors and warnings on the order.") from ce