"""
Author: Michel Peltriaux
Organization: Struktur- und Genehmigungsdirektion Nord, Rhineland-Palatinate, Germany
Contact: michel.peltriaux@sgdnord.rlp.de
Created on: 16.12.21

"""
from django.db import models

from konova.models import UuidModel


class Parcel(UuidModel):
    """ The Parcel model holds administrative data on the covered properties.

    Due to the unique but relevant naming of the administrative data, we have to use these namings as field
    names in german. Any try to translate them to English result in strange or insufficient translations.

    All fields have to be CharFields as well, since there are e.g. Flurstücksnummer holding e.g. '123____' which
    can not be realized using numerical fields.

    To avoid conflicts due to german Umlaute, the field names are shortened and vocals are dropped.

    """
    geometries = models.ManyToManyField("konova.Geometry", related_name="parcels", blank=True)
    district = models.ForeignKey("konova.District", on_delete=models.SET_NULL, null=True, blank=True, related_name="parcels")
    gmrkng = models.CharField(
        max_length=1000,
        help_text="Gemarkung",
        null=True,
        blank=True,
    )
    flrstck_nnr = models.CharField(
        max_length=1000,
        help_text="Flurstücksnenner",
        null=True,
        blank=True,
    )
    flrstck_zhlr = models.CharField(
        max_length=1000,
        help_text="Flurstückszähler",
        null=True,
        blank=True,
    )
    flr = models.CharField(
        max_length=1000,
        help_text="Flur",
        null=True,
        blank=True,
    )
    updated_on = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return f"{self.gmrkng} | {self.flr} | {self.flrstck_zhlr} | {self.flrstck_nnr}"


class District(UuidModel):
    """ The model District holds more coarse information, such as Kreis, Verbandsgemeinde and Gemeinde.

    There might be the case that a geometry lies on a hundred Parcel entries but only on one District entry.
    Therefore a geometry can have a lot of relations to Parcel entries but only a few or only a single one to one
    District.

    """
    gmnd = models.CharField(
        max_length=1000,
        help_text="Gemeinde",
        null=True,
        blank=True,
    )
    krs = models.CharField(
        max_length=1000,
        help_text="Kreis",
        null=True,
        blank=True,
    )

    def __str__(self):
        return f"{self.gmnd} | {self.krs}"