import uuid
from random import choice
from string import ascii_uppercase, digits

import swapper
from django.contrib.gis.db.models import PointField
from django.contrib.gis.geos import Point
from django.db import models, transaction
from django.utils.encoding import force_str as force_text
from django.utils.translation import gettext_lazy as _
from model_utils import Choices

from core.abstract import NiceModel

from .conf import ALTERNATIVE_NAME_TYPES, SLUGIFY_FUNCTION
from .managers import AlternativeNameManager
from .util import unicode_func

__all__ = [
    "Address",
    "AlternativeName",
    "City",
    "Continent",
    "Country",
    "District",
    "Point",
    "PostalCode",
    "Region",
    "Subregion",
]

from django.db.models import PROTECT, BooleanField, Model, UUIDField
from django.db.models import Manager as GeoManager

slugify_func = SLUGIFY_FUNCTION


def SET_NULL_OR_CASCADE(collector, field, sub_objs, using):  # noqa: N802
    if field.null is True:
        models.SET_NULL(collector, field, sub_objs, using)
    else:
        models.CASCADE(collector, field, sub_objs, using)


class SlugModel(Model):
    slug = models.CharField(blank=True, max_length=255, null=True)  # noqa: DJ001
    uuid = UUIDField(verbose_name=_("UUID"), default=uuid.uuid4, editable=False)
    active = BooleanField(default=True, verbose_name=_("active"))

    class Meta:
        abstract = True

    def slugify(self):
        raise NotImplementedError(_("subclasses_of_place_must_implement_slugify"))

    def save(self, *args, **kwargs):
        self.slug = slugify_func(self, self.slugify())
        # If the slug contains the object's ID and we are creating a new object,
        # save it twice: once to get an ID, another to set the object's slug
        if self.slug is None and getattr(self, "slug_contains_id", False):
            with transaction.atomic():
                # We first give a randomized slug with a prefix just in case
                # users need to find invalid slugs
                self.slug = "invalid-{}".format("".join(choice(ascii_uppercase + digits) for i in range(20)))
                super(SlugModel, self).save(*args, **kwargs)  # noqa: UP008
                self.slug = slugify_func(self, self.slugify())

                # If the 'force_insert' flag was passed, don't pass it again:
                # doing so will attempt to re-insert with the same primary key,
                # which will cause an IntegrityError.
                kwargs.pop("force_insert", None)
                super(SlugModel, self).save(*args, **kwargs)  # noqa: UP008
        else:
            # This is a performance optimization - we avoid the transaction if
            # the self.slug is not None
            super().save(*args, **kwargs)


class Place(Model):
    name = models.CharField(max_length=200, db_index=True, verbose_name="ascii name")
    alt_names = models.ManyToManyField("AlternativeName")

    objects = GeoManager()

    class Meta:
        abstract = True

    @property
    def hierarchy(self):
        """Get hierarchy, root first"""
        lst = self.parent.hierarchy if self.parent else []
        lst.append(self)
        return lst

    def get_absolute_url(self):
        return "/".join([place.slug for place in self.hierarchy])

    def __str__(self):
        return force_text(self.name)

    def save(self, *args, **kwargs):
        if hasattr(self, "clean"):
            self.clean()
        super(Place, self).save(*args, **kwargs)  # noqa: UP008


class BaseContinent(Place, SlugModel):
    code = models.CharField(max_length=2, unique=True, db_index=True)

    def __str__(self):
        return force_text(self.name)

    class Meta:
        abstract = True

    def slugify(self):
        return self.name


class Continent(BaseContinent):
    class Meta(BaseContinent.Meta):
        swappable = swapper.swappable_setting("geo", "Continent")
        verbose_name = _("continent")
        verbose_name_plural = _("continents")


class BaseCountry(Place, SlugModel):
    code = models.CharField(max_length=2, db_index=True, unique=True)
    code3 = models.CharField(max_length=3, db_index=True, unique=True)
    population = models.IntegerField()
    area = models.IntegerField(null=True)
    currency = models.CharField(max_length=3, null=True)  # noqa: DJ001
    currency_name = models.CharField(max_length=50, blank=True, null=True)  # noqa: DJ001
    currency_symbol = models.CharField(max_length=31, blank=True, null=True)  # noqa: DJ001
    language_codes = models.CharField(max_length=250, null=True)  # noqa: DJ001
    phone = models.CharField(max_length=20)
    continent = models.ForeignKey(
        swapper.get_model_name("geo", "Continent"), null=True, related_name="countries", on_delete=SET_NULL_OR_CASCADE
    )
    tld = models.CharField(max_length=5, verbose_name="TLD")
    postal_code_format = models.CharField(max_length=127)
    postal_code_regex = models.CharField(max_length=255)
    capital = models.CharField(max_length=100)
    neighbours = models.ManyToManyField("self")

    class Meta:
        abstract = True
        ordering = ["name"]
        verbose_name = _("country")
        verbose_name_plural = _("countries")

    @property
    def parent(self):
        return None

    def __str__(self):
        return force_text(self.name)

    def clean(self):
        self.tld = self.tld.lower()

    def slugify(self):
        return self.name


class Country(BaseCountry):
    class Meta(BaseCountry.Meta):
        swappable = swapper.swappable_setting("geo", "Country")
        verbose_name = _("country")
        verbose_name_plural = _("countries")


class Region(Place, SlugModel):
    name_std = models.CharField(max_length=200, db_index=True, verbose_name="standard name")
    code = models.CharField(max_length=200, db_index=True)
    country = models.ForeignKey(
        swapper.get_model_name("geo", "Country"), related_name="regions", on_delete=SET_NULL_OR_CASCADE
    )

    class Meta:
        unique_together = (("country", "name"),)
        verbose_name = _("region")
        verbose_name_plural = _("regions")

    @property
    def parent(self):
        return self.country

    def full_code(self):
        return unicode_func(".".join([self.parent.code, self.code]))

    def slugify(self):
        return f"{unicode_func(self.name)}_({unicode_func(self.full_code())})"


class Subregion(Place, SlugModel):
    slug_contains_id = True

    name_std = models.CharField(max_length=200, db_index=True, verbose_name="standard name")
    code = models.CharField(max_length=200, db_index=True)
    region = models.ForeignKey(Region, related_name="subregions", on_delete=SET_NULL_OR_CASCADE)

    class Meta:
        unique_together = (("region", "id", "name"),)
        verbose_name = _("subregion")
        verbose_name_plural = _("subregions")

    @property
    def parent(self):
        return self.region

    def full_code(self):
        return ".".join([self.parent.parent.code, self.parent.code, self.code])

    def slugify(self):
        return unicode_func("{}-{}").format(unicode_func(self.id), unicode_func(self.name))


class BaseCity(Place, SlugModel):
    slug_contains_id = True

    name_std = models.CharField(max_length=200, db_index=True, verbose_name="standard name")
    country = models.ForeignKey(
        swapper.get_model_name("geo", "Country"), related_name="geo", on_delete=SET_NULL_OR_CASCADE
    )
    region = models.ForeignKey(Region, null=True, blank=True, related_name="geo", on_delete=SET_NULL_OR_CASCADE)
    subregion = models.ForeignKey(Subregion, null=True, blank=True, related_name="geo", on_delete=SET_NULL_OR_CASCADE)
    location = PointField()
    population = models.IntegerField()
    elevation = models.IntegerField(null=True)
    kind = models.CharField(max_length=10)  # http://www.geonames.org/export/codes.html
    timezone = models.CharField(max_length=40)

    class Meta:
        abstract = True
        unique_together = (("country", "region", "subregion", "id", "name"),)
        verbose_name = _("city")
        verbose_name_plural = _("cities")

    @property
    def parent(self):
        return self.region

    def slugify(self):
        if self.id:
            return f"{self.id}-{unicode_func(self.name)}"
        return None


class City(BaseCity):
    class Meta(BaseCity.Meta):
        swappable = swapper.swappable_setting("geo", "City")
        verbose_name = _("city")
        verbose_name_plural = _("cities")


class District(Place, SlugModel):
    slug_contains_id = True

    name_std = models.CharField(max_length=200, db_index=True, verbose_name="standard name")
    code = models.CharField(blank=True, db_index=True, max_length=200, null=True)  # noqa: DJ001
    location = PointField()
    population = models.IntegerField()
    city = models.ForeignKey(
        swapper.get_model_name("geo", "City"), related_name="districts", on_delete=SET_NULL_OR_CASCADE
    )

    class Meta:
        unique_together = (("city", "name"),)
        verbose_name = _("district")
        verbose_name_plural = _("districts")

    @property
    def parent(self):
        return self.city

    def slugify(self):
        if self.id:
            return f"{self.id}-{unicode_func(self.name)}"
        return None


class AlternativeName(SlugModel):
    slug_contains_id = True

    KIND = Choices(*ALTERNATIVE_NAME_TYPES)

    name = models.CharField(max_length=255)
    kind = models.CharField(max_length=4, choices=KIND, default=KIND.name)
    language_code = models.CharField(max_length=100)
    is_preferred = models.BooleanField(default=False)
    is_short = models.BooleanField(default=False)
    is_colloquial = models.BooleanField(default=False)
    is_historic = models.BooleanField(default=False)

    objects = AlternativeNameManager()

    def __str__(self):
        return f"{force_text(self.name)} ({force_text(self.language_code)})"

    def slugify(self):
        return None or f"{self.id}-{unicode_func(self.name)}"


class PostalCode(Place, SlugModel):
    slug_contains_id = True

    code = models.CharField(max_length=20)
    location = PointField()

    country = models.ForeignKey(
        swapper.get_model_name("geo", "Country"), related_name="postal_codes", on_delete=SET_NULL_OR_CASCADE
    )

    # Region names for each admin level, region may not exist in DB
    region_name = models.CharField(max_length=100, db_index=True)
    subregion_name = models.CharField(max_length=100, db_index=True)
    district_name = models.CharField(max_length=100, db_index=True)

    region = models.ForeignKey(
        Region, blank=True, null=True, related_name="postal_codes", on_delete=SET_NULL_OR_CASCADE
    )
    subregion = models.ForeignKey(
        Subregion, blank=True, null=True, related_name="postal_codes", on_delete=SET_NULL_OR_CASCADE
    )
    city = models.ForeignKey(
        swapper.get_model_name("geo", "City"),
        blank=True,
        null=True,
        related_name="postal_codes",
        on_delete=SET_NULL_OR_CASCADE,
    )
    district = models.ForeignKey(
        District, blank=True, null=True, related_name="postal_codes", on_delete=SET_NULL_OR_CASCADE
    )

    objects = GeoManager()

    class Meta:
        unique_together = (
            ("country", "region", "subregion", "city", "district", "name", "id", "code"),
            ("country", "region_name", "subregion_name", "district_name", "name", "id", "code"),
        )
        verbose_name = _("postal code")
        verbose_name_plural = _("postal codes")

    @property
    def parent(self):
        return self.country

    @property
    def name_full(self):
        """Get full name including hierarchy"""
        return force_text(", ".join(reversed(self.names)))

    @property
    def names(self):
        """Get a hierarchy of non-null names, root first"""
        return [
            e
            for e in [
                force_text(self.country),
                force_text(self.region_name),
                force_text(self.subregion_name),
                force_text(self.district_name),
                force_text(self.name),
            ]
            if e
        ]

    def __str__(self):
        return force_text(self.code)

    def slugify(self):
        return None or f"{self.id}-{unicode_func(self.code)}"


class Address(NiceModel):
    street = models.CharField(max_length=255)
    city = models.ForeignKey("geo.City", on_delete=PROTECT, blank=False, null=False)
    region = models.ForeignKey("geo.Region", on_delete=PROTECT, blank=False, null=False)
    postal_code = models.ForeignKey("geo.PostalCode", on_delete=PROTECT, blank=False, null=False)
    country = models.ForeignKey("geo.Country", on_delete=PROTECT, blank=False, null=False)
    location = PointField(geography=True, null=True)
    user = models.ForeignKey(to="vibes_auth.User", on_delete=models.CASCADE, blank=False, null=True)

    def __str__(self):
        return f"{self.street}, {self.city}, {self.country}"

    class Meta:
        verbose_name = _("address")
        verbose_name_plural = _("addresses")