from collections.abc import Iterable

from .inspection import InspectionMixin


class SerializeMixin(InspectionMixin):
    """Mixin to make model serializable."""

    __abstract__ = True

    def to_dict(self, nested=False, hybrid_attributes=False, exclude=None):
        """Return dict object with model's data.

        :param nested: flag to return nested relationships' data if true
        :type: bool
        :param hybrid_attributes: flag to include hybrid attributes if true
        :type: bool
        :return: dict
        """
        result = dict()

        if exclude is None:
            view_cols = self.columns
        else:
            view_cols = filter(lambda e: e not in exclude, self.columns)

        for key in view_cols:
            result[key] = getattr(self, key)

        if hybrid_attributes:
            for key in self.hybrid_properties:
                result[key] = getattr(self, key)

        if nested:
            for key in self.relations:
                obj = getattr(self, key)

                if isinstance(obj, SerializeMixin):
                    result[key] = obj.to_dict(hybrid_attributes=hybrid_attributes)
                elif isinstance(obj, Iterable):
                    result[key] = [
                        o.to_dict(hybrid_attributes=hybrid_attributes)
                        for o in obj
                        if isinstance(o, SerializeMixin)
                    ]

        return result