"""
Author: Michel Peltriaux
Organization: Struktur- und Genehmigungsdirektion Nord, Rhineland-Palatinate, Germany
Contact: michel.peltriaux@sgdnord.rlp.de
Created on: 24.01.22

"""
from django.db import transaction
from django.db.models import QuerySet

from api.utils.serializer.v1.serializer import AbstractModelAPISerializerV1, \
    ResponsibilityAPISerializerV1Mixin, LegalAPISerializerV1Mixin, DeductableAPISerializerV1Mixin
from compensation.models import Payment
from intervention.models import Intervention, Responsibility, Legal
from konova.models import Geometry
from konova.tasks import celery_update_parcels
from user.models import UserActionLogEntry


class InterventionAPISerializerV1(AbstractModelAPISerializerV1,
                                  ResponsibilityAPISerializerV1Mixin,
                                  LegalAPISerializerV1Mixin,
                                  DeductableAPISerializerV1Mixin):
    model = Intervention

    def _compensations_to_json(self, qs: QuerySet):
        return list(
            qs.values(
                "id", "identifier", "title"
            )
        )

    def _payments_to_json(self, qs: QuerySet):
        """ Serializes payments into json

        Args:
            qs (QuerySet): A queryset of Payment entries

        Returns:
            serialized_json (list)
        """
        return list(qs.values("amount", "due_on", "comment"))

    def _extend_properties_data(self, entry):
        self.properties_data["responsible"] = self._responsible_to_json(entry.responsible)
        self.properties_data["legal"] = self._legal_to_json(entry.legal)
        self.properties_data["compensations"] = self._compensations_to_json(entry.compensations.all())
        self.properties_data["payments"] = self._payments_to_json(entry.payments.all())
        self.properties_data["deductions"] = self._deductions_to_json(entry.deductions.all())

    def _initialize_objects(self, json_model, user):
        """ Initializes all needed objects from the json_model data

        Does not persist data to the DB!

        Args:
            json_model (dict): The json data
            user (User): The API user

        Returns:
            obj (Intervention)
        """
        create_action = UserActionLogEntry.get_created_action(user, comment="API Import")
        # Create geometry
        json_geom = self._create_geometry_from_json(json_model)
        geometry = Geometry()
        geometry.geom = json_geom
        geometry.created = create_action

        # Create linked objects
        obj = Intervention()
        resp = Responsibility()
        legal = Legal()
        created = create_action
        obj.legal = legal
        obj.created = created
        obj.geometry = geometry
        obj.responsible = resp
        return obj

    def _set_payments(self, obj, payment_data):
        """ Sets the linked Payment data according to the given payment_data


        Args:
            obj (Compensation): The Compensation object
            payment_data (dict): The posted payment_data

        Returns:
            obj (intervention)
        """
        if payment_data is None:
            return obj
        payments = []
        for entry in payment_data:
            due_on = entry["due_on"]
            amount = float(entry["amount"])
            comment = entry["comment"]

            # Check on validity
            if amount <= 0:
                raise ValueError("Payment amount must be > 0")

            no_due_on = due_on is None or len(due_on) == 0
            no_comment = comment is None or len(comment) == 0

            if no_due_on and no_comment:
                raise ValueError("If no due_on can be provided, you need to explain why using the comment")

            # If this exact data is already existing, we do not create it new. Instead put it's id in the list of
            # entries, we will use to set the new actions
            pre_existing_payment = obj.payments.filter(
                amount=amount,
                due_on=due_on,
                comment=comment,
            ).exclude(
                id__in=payments
            ).first()
            if pre_existing_payment is not None:
                payments.append(pre_existing_payment.id)
            else:
                # Create and add id to list
                new_payment = Payment.objects.create(
                    amount=amount,
                    due_on=due_on,
                    comment=comment,
                )
                payments.append(new_payment.id)
        payments = Payment.objects.filter(
            id__in=payments
        )
        obj.payments.set(payments)
        return obj

    def create_model_from_json(self, json_model, user):
        """ Creates a new entry for the model based on the contents of json_model

        Args:
            json_model (dict): The json containing data
            user (User): The API user

        Returns:
            created_id (str): The id of the newly created Intervention entry
        """
        with transaction.atomic():
            obj = self._initialize_objects(json_model, user)

            # Fill in data to objects
            properties = json_model["properties"]
            obj.identifier = obj.generate_new_identifier()
            obj.title = properties["title"]
            self._set_responsibility(obj, properties["responsible"])
            self._set_legal(obj, properties["legal"])

            obj.responsible.save()
            obj.geometry.save()
            obj.legal.save()
            obj.save()

            obj.users.add(user)
            obj.log.add(obj.created)

            celery_update_parcels.delay(obj.geometry.id)

            return obj.id

    def update_model_from_json(self, id, json_model, user):
        """ Updates an entry for the model based on the contents of json_model

        Args:
            id (str): The object's id
            json_model (dict): The json containing data
            user (User): The API user

        Returns:
            created_id (str): The id of the newly created Intervention entry
        """
        with transaction.atomic():
            update_action = UserActionLogEntry.get_edited_action(user, "API update")
            obj = self._get_obj_from_db(id, user)

            # Fill in data to objects
            properties = json_model["properties"]
            obj.title = properties["title"]
            self._set_responsibility(obj, properties.get("responsible", None))
            self._set_legal(obj, properties.get("legal", None))
            self._set_payments(obj, properties.get("payments", None))
            obj.geometry.geom = self._create_geometry_from_json(json_model)
            obj.geometry.modified = update_action

            obj.responsible.save()
            obj.geometry.save()
            obj.legal.save()
            obj.save()

            obj.mark_as_edited(user)

            celery_update_parcels.delay(obj.geometry.id)

            return obj.id