generic_assets.py

from typing import Optional
import json

from marshmallow import validates, validates_schema, ValidationError, fields

from flexmeasures.data import ma
from flexmeasures.data.models.user import Account
from flexmeasures.data.models.generic_assets import GenericAsset, GenericAssetType
from flexmeasures.data.schemas.utils import (
    FMValidationError,
    MarshmallowClickMixin,
    with_appcontext_if_needed,
)


class JSON(fields.Field):
    def _deserialize(self, value, attr, data, **kwargs):
        if value:
            try:
                return json.loads(value)
            except ValueError:
                return None

        return None

    def _serialize(self, value, attr, data, **kwargs):
        return json.dumps(value)


class GenericAssetSchema(ma.SQLAlchemySchema):
    """
    GenericAsset schema, with validations.
    """

    id = ma.auto_field(dump_only=True)
    name = fields.Str(required=True)
    account_id = ma.auto_field()
    latitude = ma.auto_field()
    longitude = ma.auto_field()
    generic_asset_type_id = fields.Integer(required=True)
    attributes = JSON(required=False)

    class Meta:
        model = GenericAsset

    @validates_schema(skip_on_field_errors=False)
    def validate_name_is_unique_in_account(self, data, **kwargs):
        if "name" in data and "account_id" in data:
            asset = GenericAsset.query.filter(
                GenericAsset.name == data["name"]
                and GenericAsset.account_id == data["account_id"]
            ).one_or_none()
            if asset:
                raise ValidationError(
                    f"An asset with the name {data['name']} already exists in this account.",
                    "name",
                )

    @validates("generic_asset_type_id")
    def validate_generic_asset_type(self, generic_asset_type_id: int):
        generic_asset_type = GenericAssetType.query.get(generic_asset_type_id)
        if not generic_asset_type:
            raise ValidationError(
                f"GenericAssetType with id {generic_asset_type_id} doesn't exist."
            )

    @validates("account_id")
    def validate_account(self, account_id: int):
        account = Account.query.get(account_id)
        if not account:
            raise ValidationError(f"Account with Id {account_id} doesn't exist.")

    @validates("latitude")
    def validate_latitude(self, latitude: Optional[float]):
        """Validate optional latitude."""
        if latitude is None:
            return
        if latitude < -90:
            raise ValidationError(
                f"Latitude {latitude} exceeds the minimum latitude of -90 degrees."
            )
        if latitude > 90:
            raise ValidationError(
                f"Latitude {latitude} exceeds the maximum latitude of 90 degrees."
            )

    @validates("longitude")
    def validate_longitude(self, longitude: Optional[float]):
        """Validate optional longitude."""
        if longitude is None:
            return
        if longitude < -180:
            raise ValidationError(
                f"Longitude {longitude} exceeds the minimum longitude of -180 degrees."
            )
        if longitude > 180:
            raise ValidationError(
                f"Longitude {longitude} exceeds the maximum longitude of 180 degrees."
            )


class GenericAssetTypeSchema(ma.SQLAlchemySchema):
    """
    GenericAssetType schema, with validations.
    """

    id = ma.auto_field()
    name = fields.Str()
    description = ma.auto_field()

    class Meta:
        model = GenericAssetType


class GenericAssetIdField(MarshmallowClickMixin, fields.Int):
    """Field that deserializes to a GenericAsset and serializes back to an integer."""

    @with_appcontext_if_needed()
    def _deserialize(self, value, attr, obj, **kwargs) -> GenericAsset:
        """Turn a generic asset id into a GenericAsset."""
        generic_asset = GenericAsset.query.get(value)
        if generic_asset is None:
            raise FMValidationError(f"No asset found with id {value}.")
        # lazy loading now (asset is somehow not in session after this)
        generic_asset.generic_asset_type
        return generic_asset

    def _serialize(self, asset, attr, data, **kwargs):
        """Turn a GenericAsset into a generic asset id."""
        return asset.id