"""Utility functions for the accountant"""

import json
from typing import Any, Optional

from sqlalchemy.orm import DeclarativeBase
from sqlalchemy.types import VARCHAR, TypeDecorator


class Base(DeclarativeBase):
    pass


# pylint: disable=abstract-method
class Json(TypeDecorator):
    """Represents an immutable structure as a json-encoded string.
    From https://docs.sqlalchemy.org/en/13/core/
        custom_types.html#marshal-json-strings
    Usage::
        JSONEncodedDict(255)"""

    impl = VARCHAR

    def process_bind_param(self, value: Any, dialect: Any) -> Any:
        if value is not None:
            value = json.dumps(value)

        return value

    def process_result_value(self, value: Any, dialect: Any) -> Any:
        if value is not None:
            value = json.loads(value)
        return value


def compare(list1: Optional[list], list2: Optional[list]) -> bool:
    """compare if 2 unhashable and unsortable lists have the same elements"""
    if list1 == list2:
        return True
    if list1 is None or list2 is None:
        return False

    list2 = list(list2)  # make a mutable copy
    try:
        for elem in list1:
            list2.remove(elem)
    except ValueError:
        return False
    return not list2