import uuid

from django.db import models
from django.urls import reverse
from django.utils.translation import gettext_lazy as _
from datetime import datetime
from django.utils import timezone
from django.dispatch import receiver
from django.db.models.signals import post_save
from django.contrib.auth.models import Group
from django.contrib.auth.models import AbstractUser

from .tools import misc, geo
from notfellchen.settings import MEDIA_URL


class Language(models.Model):
    """Model representing a Language (e.g. English, French, Japanese, etc.)"""
    name = models.CharField(max_length=200,
                            help_text=_("Der Name einer natürliche Sprache wie Deutsch, Englisch oder Arabisch."),
                            unique=True)

    languagecode = models.CharField(max_length=10,
                                    # Translators: This helptext includes an URL
                                    help_text=_(
                                        "Der standartisierte Sprachcode. Mehr Informationen: http://www.i18nguy.com/unicode/language-identifiers.html"),
                                    verbose_name=_('Sprachcode'))

    def __str__(self):
        """String for representing the Model object (in Admin site etc.)"""
        return self.name

    class Meta:
        verbose_name = _('Sprache')
        verbose_name_plural = _('Sprachen')


class User(AbstractUser):
    """
    Model that holds a user's profile, including the django user model

    The trust levels act as permission system and can be displayed as a badge for the user
    """

    # Admins can perform all actions and have the highest trust associated with them
    # Moderators can make moderation decisions regarding the deletion of content
    # Coordinators can create adoption notices without them being checked
    # Members can create adoption notices that must be activated
    ADMIN = "admin"
    MODERATOR = "Moderator"
    COORDINATOR = "Koordinator*in"
    MEMBER = "Mitglied"
    TRUST_LEVEL = {
        ADMIN: 4,
        MODERATOR: 3,
        COORDINATOR: 2,
        MEMBER: 1,
    }

    preferred_language = models.ForeignKey(Language, on_delete=models.PROTECT, null=True, blank=True,
                                           verbose_name=_('Bevorzugte Sprache'))
    trust_level = models.IntegerField(choices=TRUST_LEVEL, default=TRUST_LEVEL[MEMBER])

    class Meta:
        verbose_name = _('Nutzer*in')
        verbose_name_plural = _('Nutzer*innen')

    def get_absolute_url(self):
        return reverse("user-detail", args=[str(self.pk)])

    def get_notifications_url(self):
        return self.get_absolute_url()

    def get_num_unread_notifications(self):
        return BaseNotification.objects.filter(user=self, read=False).count()

    @property
    def owner(self):
        return self


class Image(models.Model):
    image = models.ImageField(upload_to='images')
    alt_text = models.TextField(max_length=2000)
    owner = models.ForeignKey(User, on_delete=models.CASCADE)

    def __str__(self):
        return self.alt_text

    @property
    def as_html(self):
        return f'<img src="{MEDIA_URL}/{self.image}" alt="{self.alt_text}">'


class Species(models.Model):
    """Model representing a species of animal."""
    name = models.CharField(max_length=200, help_text=_('Name der Tierart'),
                            verbose_name=_('Name'))

    def __str__(self):
        """String for representing the Model object."""
        return self.name

    class Meta:
        verbose_name = _('Tierart')
        verbose_name_plural = _('Tierarten')


class Location(models.Model):
    place_id = models.IntegerField()
    latitude = models.FloatField()
    longitude = models.FloatField()
    name = models.CharField(max_length=2000)

    def __str__(self):
        return f"{self.name} ({self.latitude:.5}, {self.longitude:.5})"

    @staticmethod
    def get_location_from_string(location_string):
        geo_api = geo.GeoAPI()
        geojson = geo_api.get_geojson_for_query(location_string)
        if geojson is None:
            return None
        result = geojson[0]
        if "name" in result:
            name = result["name"]
        else:
            name = result["display_name"]
        location = Location.objects.create(
            place_id=result["place_id"],
            latitude=result["lat"],
            longitude=result["lon"],
            name=name,
        )
        return location

    @staticmethod
    def add_location_to_object(instance):
        """Search the location given in the location string and add it to the object"""
        location = Location.get_location_from_string(instance.location_string)
        instance.location = location
        instance.save()


class RescueOrganization(models.Model):
    def __str__(self):
        return f"{self.name}"

    USE_MATERIALS_ALLOWED = "allowed"
    USE_MATERIALS_REQUESTED = "requested"
    USE_MATERIALS_DENIED = "denied"
    USE_MATERIALS_OTHER = "other"
    USE_MATERIALS_NOT_ASKED = "not_asked"

    ALLOW_USE_MATERIALS_CHOICE = {
        USE_MATERIALS_ALLOWED: "Usage allowed",
        USE_MATERIALS_REQUESTED: "Usage requested",
        USE_MATERIALS_DENIED: "Usage denied",
        USE_MATERIALS_OTHER: "It's complicated",
        USE_MATERIALS_NOT_ASKED: "Not asked"
    }

    name = models.CharField(max_length=200)
    trusted = models.BooleanField(default=False, verbose_name=_('Vertrauenswürdig'))
    allows_using_materials = models.CharField(max_length=200,
                                              default=ALLOW_USE_MATERIALS_CHOICE[USE_MATERIALS_NOT_ASKED],
                                              choices=ALLOW_USE_MATERIALS_CHOICE,
                                              verbose_name=_('Erlaubt Nutzung von Inhalten'))
    location_string = models.CharField(max_length=200, verbose_name=_("Ort der Organisation"))
    location = models.ForeignKey(Location, on_delete=models.PROTECT, blank=True, null=True)
    instagram = models.URLField(null=True, blank=True, verbose_name=_('Instagram Profil'))
    facebook = models.URLField(null=True, blank=True, verbose_name=_('Facebook Profil'))
    fediverse_profile = models.URLField(null=True, blank=True, verbose_name=_('Fediverse Profil'))
    website = models.URLField(null=True, blank=True, verbose_name=_('Website'))


class AdoptionNotice(models.Model):
    class Meta:
        permissions = [
            ("create_active_adoption_notice", "Can create an active adoption notice"),
        ]

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

    created_at = models.DateField(verbose_name=_('Erstellt am'), default=datetime.now)
    last_checked = models.DateTimeField(verbose_name=_('Zuletzt überprüft am'), default=datetime.now)
    searching_since = models.DateField(verbose_name=_('Sucht nach einem Zuhause seit'))
    name = models.CharField(max_length=200)
    description = models.TextField(null=True, blank=True, verbose_name=_('Beschreibung'))
    organization = models.ForeignKey(RescueOrganization, blank=True, null=True, on_delete=models.SET_NULL,
                                     verbose_name=_('Organisation'))
    further_information = models.URLField(null=True, blank=True, verbose_name=_('Link zu mehr Informationen'))
    group_only = models.BooleanField(default=False, verbose_name=_('Ausschließlich Gruppenadoption'))
    photos = models.ManyToManyField(Image, blank=True)
    location_string = models.CharField(max_length=200, verbose_name=_("Ortsangabe"))
    location = models.ForeignKey(Location, blank=True, null=True, on_delete=models.SET_NULL, )
    owner = models.ForeignKey(User, on_delete=models.CASCADE, verbose_name=_('Creator'))

    @property
    def animals(self):
        return Animal.objects.filter(adoption_notice=self)

    @property
    def comments(self):
        return Comment.objects.filter(adoption_notice=self)

    @property
    def position(self):
        if self.location is None:
            return None
        else:
            return self.location.latitude, self.location.longitude

    @property
    def description_short(self):
        if self.description is None:
            return ""
        if len(self.description) > 200:
            return self.description[:200] + f" ... [weiterlesen]({self.get_absolute_url()})"

    def get_absolute_url(self):
        """Returns the url to access a detailed page for the adoption notice."""
        return reverse('adoption-notice-detail', args=[str(self.id)])

    def get_report_url(self):
        """Returns the url to report an adoption notice."""
        return reverse('report-adoption-notice', args=[str(self.id)])

    def get_subscriptions(self):
        # returns all subscriptions to that adoption notice
        return Subscriptions.objects.filter(adoption_notice=self)

    def get_photos(self):
        """
        First trys to get group photos that are attached to the adoption notice if there is none it trys to fetch
        them from the animals
        """
        group_photos = self.photos.all()
        if len(group_photos) > 0:
            return group_photos
        else:
            photos = []
            for animal in self.animals:
                photos.extend(animal.photos.all())
            if len(photos) > 0:
                return photos

    def get_photo(self):
        """
        Returns the first photo it finds.
        First trys to get group photos that are attached to the adoption notice if there is none it trys to fetch
        them from the animals
        """
        group_photos = self.photos.all()
        if len(group_photos) > 0:
            return group_photos[0]
        else:
            photos = []
            for animal in self.animals:
                photos.extend(animal.photos.all())
            if len(photos) > 0:
                return photos[0]

    def in_distance(self, position, max_distance, unknown_true=True):
        """
        Returns a boolean indicating if the Location of the adoption notice is within a given distance to the position

        If the location is none, we by default return that the location is within the given distance
        """
        if unknown_true and self.position is None:
            return True

        distance = geo.calculate_distance_between_coordinates(self.position, position)
        return distance < max_distance

    @property
    def link_to_more_information(self):
        from urllib.parse import urlparse

        domain = urlparse(self.further_information).netloc
        return f"<a href='{self.further_information}'>{domain}</a>"

    @property
    def is_active(self):
        if not hasattr(self, 'adoptionnoticestatus'):
            return False
        return self.adoptionnoticestatus.is_active

    def set_checked(self):
        self.last_checked = datetime.now()
        self.save()

    def set_closed(self):
        self.last_checked = datetime.now()
        self.adoptionnoticestatus.set_closed()


class AdoptionNoticeStatus(models.Model):
    """
    The major status indicates a general state of an adoption notice
    whereas the minor status is used for reporting
    """

    ACTIVE = "active"
    AWAITING_ACTION = "awaiting_action"
    CLOSED = "closed"
    DISABLED = "disabled"
    MAJOR_STATUS_CHOICES = {
        ACTIVE: "active",
        AWAITING_ACTION: "in review",
        CLOSED: "closed",
        DISABLED: "disabled",
    }

    MINOR_STATUS_CHOICES = {
        ACTIVE: {
            "searching": "searching",
            "interested": "interested",
        },
        AWAITING_ACTION: {
            "waiting_for_review": "waiting_for_review",
            "needs_additional_info": "needs_additional_info",
        },
        CLOSED: {
            "successful_with_notfellchen": "successful_with_notfellchen",
            "successful_without_notfellchen": "successful_without_notfellchen",
            "animal_died": "animal_died",
            "closed_for_other_adoption_notice": "closed_for_other_adoption_notice",
            "not_open_for_adoption_anymore": "not_open_for_adoption_anymore",
            "other": "other"
        },
        DISABLED: {
            "against_the_rules": "against_the_rules",
            "missing_information": "missing_information",
            "technical_error": "technical_error",
            "unchecked": "unchecked",
            "other": "other"
        }
    }

    major_status = models.CharField(choices=MAJOR_STATUS_CHOICES, max_length=200)
    minor_choices = {}
    for key in MINOR_STATUS_CHOICES:
        minor_choices.update(MINOR_STATUS_CHOICES[key])
    minor_status = models.CharField(choices=minor_choices, max_length=200)
    adoption_notice = models.OneToOneField(AdoptionNotice, on_delete=models.CASCADE)

    def __str__(self):
        return f"{self.adoption_notice}: {self.major_status}, {self.minor_status}"

    @property
    def is_active(self):
        return self.major_status == self.ACTIVE

    @staticmethod
    def get_minor_choices(major_status):
        return AdoptionNoticeStatus.MINOR_STATUS_CHOICES[major_status]

    def set_closed(self):
        self.major_status = self.MAJOR_STATUS_CHOICES[self.CLOSED]
        self.minor_status = self.MINOR_STATUS_CHOICES[self.CLOSED]["other"]
        self.save()

    def deactivate_unchecked(self):
        self.major_status = self.MAJOR_STATUS_CHOICES[self.DISABLED]
        self.minor_status = self.MINOR_STATUS_CHOICES[self.DISABLED]["unchecked"]
        self.save()


class Animal(models.Model):
    MALE_NEUTERED = "M_N"
    MALE = "M"
    FEMALE_NEUTERED = "F_N"
    FEMALE = "F"
    SEX_CHOICES = {
        MALE_NEUTERED: "neutered male",
        MALE: "male",
        FEMALE_NEUTERED: "neutered female",
        FEMALE: "female",
    }

    date_of_birth = models.DateField(verbose_name=_('Geburtsdatum'))
    name = models.CharField(max_length=200)
    description = models.TextField(null=True, blank=True, verbose_name=_('Beschreibung'))
    species = models.ForeignKey(Species, on_delete=models.PROTECT)
    photos = models.ManyToManyField(Image, blank=True)
    sex = models.CharField(max_length=20, choices=SEX_CHOICES, )
    adoption_notice = models.ForeignKey(AdoptionNotice, on_delete=models.CASCADE)
    owner = models.ForeignKey(User, on_delete=models.CASCADE)

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

    @property
    def age(self):
        return datetime.today().date() - self.date_of_birth

    @property
    def hr_age(self):
        """Returns a human-readable age based on the date of birth."""
        return misc.age_as_hr_string(self.age)

    def get_photo(self):
        """
        Selects a random photo from the animal
        """
        photos = self.photos.all()
        if len(photos) > 0:
            return photos[0]

    def get_photos(self):
        """
        Selects all photos from the animal
        """
        return self.photos.all()

    def get_absolute_url(self):
        """Returns the url to access a detailed page for the animal."""
        return reverse('animal-detail', args=[str(self.id)])


class Rule(models.Model):
    """
    Class to store rules
    """
    title = models.CharField(max_length=200)

    # Markdown is allowed in rule text
    rule_text = models.TextField()
    language = models.ForeignKey(Language, on_delete=models.PROTECT)
    # Rule identifier allows to translate rules with the same identifier
    rule_identifier = models.CharField(max_length=24)

    def __str__(self):
        return self.title


class Report(models.Model):
    class Meta:
        permissions = []

    ACTION_TAKEN = "action taken"
    NO_ACTION_TAKEN = "no action taken"
    WAITING = "waiting"
    STATES = {
        ACTION_TAKEN: "Action was taken",
        NO_ACTION_TAKEN: "No action was taken",
        WAITING: "Waiting for moderator action",
    }
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, help_text=_('ID dieses reports'),
                          verbose_name=_('ID'))
    status = models.CharField(max_length=30, choices=STATES)
    reported_broken_rules = models.ManyToManyField(Rule)
    user_comment = models.TextField(blank=True)
    created_at = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return f"[{self.status}]: {self.user_comment:.20}"

    def get_absolute_url(self):
        """Returns the url to access a detailed page for the report."""
        return reverse('report-detail', args=[str(self.id)])

    def get_reported_rules(self):
        return self.reported_broken_rules.all()

    def get_moderation_actions(self):
        return ModerationAction.objects.filter(report=self)


class ReportAdoptionNotice(Report):
    adoption_notice = models.ForeignKey("AdoptionNotice", on_delete=models.CASCADE)

    @property
    def reported_content(self):
        return self.adoption_notice


class ReportComment(Report):
    reported_comment = models.ForeignKey("Comment", on_delete=models.CASCADE)

    @property
    def reported_content(self):
        return self.reported_comment


class ModerationAction(models.Model):
    BAN = "user_banned"
    DELETE = "content_deleted"
    COMMENT = "comment"
    OTHER = "other_action_taken"
    NONE = "no_action_taken"
    ACTIONS = {
        BAN: "User was banned",
        DELETE: "Content was deleted",
        COMMENT: "Comment was added",
        OTHER: "Other action was taken",
        NONE: "No action was taken"
    }
    action = models.CharField(max_length=30, choices=ACTIONS.items())
    created_at = models.DateTimeField(auto_now_add=True)
    public_comment = models.TextField(blank=True)
    # Only visible to moderator
    private_comment = models.TextField(blank=True)
    report = models.ForeignKey(Report, on_delete=models.CASCADE)

    # TODO: Needs field for moderator that performed the action

    def __str__(self):
        return f"[{self.action}]: {self.public_comment}"


"""
Membership
"""


class Text(models.Model):
    """
    Base class to store markdown content
    """
    title = models.CharField(max_length=100)
    content = models.TextField(verbose_name="Inhalt")
    language = models.ForeignKey(Language, verbose_name="Sprache", on_delete=models.PROTECT)
    text_code = models.CharField(max_length=24, verbose_name="Text code", blank=True)

    class Meta:
        verbose_name = "Text"
        verbose_name_plural = "Texte"

    def __str__(self):
        return f"{self.title} ({self.language})"

    @staticmethod
    def get_texts(text_codes, language, expandable_dict=None):
        if expandable_dict is None:
            expandable_dict = {}
        for text_code in text_codes:
            try:
                expandable_dict[text_code] = Text.objects.get(text_code=text_code, language=language, )
            except Text.DoesNotExist:
                expandable_dict[text_code] = None
        return expandable_dict


class Announcement(Text):
    """
    Class to store announcements that should be displayed for all users
    """
    logged_in_only = models.BooleanField(default=False)
    created_at = models.DateTimeField(auto_now_add=True)
    publish_start_time = models.DateTimeField(verbose_name="Veröffentlichungszeitpunkt")
    publish_end_time = models.DateTimeField(verbose_name="Veröffentlichungsende")
    IMPORTANT = "important"
    WARNING = "warning"
    INFO = "info"
    TYPES = {
        IMPORTANT: "important",
        WARNING: "warning",
        INFO: "info",
    }
    type = models.CharField(choices=TYPES, max_length=100, default=INFO)

    @property
    def is_active(self):
        return self.publish_start_time < timezone.now() < self.publish_end_time

    def __str__(self):
        return f"[{'🟢' if self.is_active else '🔴'}]{self.title} ({self.language})"

    @staticmethod
    def get_active_announcements(logged_in=False, language=None):
        if logged_in:
            all_active_announcements = [a for a in Announcement.objects.all() if a.is_active]
        else:
            all_active_announcements = [a for a in Announcement.objects.filter(logged_in_only=False) if a.is_active]
        if language is None:
            return all_active_announcements
        else:
            if logged_in:
                announcements_in_language = Announcement.objects.filter(language=language)
            else:
                announcements_in_language = Announcement.objects.filter(language=language, logged_in_only=False)
            active_announcements_in_language = [a for a in announcements_in_language if a.is_active]

            untranslated_announcements = []
            text_codes = [announcement.text_code for announcement in active_announcements_in_language]
            for announcement in all_active_announcements:
                if announcement.language != language and announcement.text_code not in text_codes:
                    untranslated_announcements.append(announcement)
            return active_announcements_in_language + untranslated_announcements


class Comment(models.Model):
    """
    Class to store comments in markdown content
    """
    user = models.ForeignKey(User, on_delete=models.CASCADE, verbose_name=_('Nutzer*in'))
    created_at = models.DateTimeField(auto_now_add=True)
    adoption_notice = models.ForeignKey(AdoptionNotice, on_delete=models.CASCADE, verbose_name=_('AdoptionNotice'))
    text = models.TextField(verbose_name="Inhalt")
    reply_to = models.ForeignKey("self", verbose_name="Antwort auf", blank=True, null=True, on_delete=models.CASCADE)

    def __str__(self):
        return f"{self.user} at {self.created_at.strftime('%H:%M %d.%m.%y')}: {self.text:.10}"

    def get_report_url(self):
        return reverse('report-comment', args=[str(self.id)])

    @property
    def get_absolute_url(self):
        return self.adoption_notice.get_absolute_url()


class BaseNotification(models.Model):
    created_at = models.DateTimeField(auto_now_add=True)
    title = models.CharField(max_length=100)
    text = models.TextField(verbose_name="Inhalt")
    user = models.ForeignKey(User, on_delete=models.CASCADE, verbose_name=_('Nutzer*in'))
    read = models.BooleanField(default=False)

    def __str__(self):
        return f"[{self.user}] {self.title} ({self.created_at})"

    def get_absolute_url(self):
        self.user.get_notifications_url()


class CommentNotification(BaseNotification):
    comment = models.ForeignKey(Comment, on_delete=models.CASCADE, verbose_name=_('Antwort'))

    @property
    def url(self):
        print(f"URL: self.comment.get_absolute_url()")
        return self.comment.get_absolute_url


class Subscriptions(models.Model):
    owner = models.ForeignKey(User, on_delete=models.CASCADE, verbose_name=_('Nutzer*in'))
    adoption_notice = models.ForeignKey(AdoptionNotice, on_delete=models.CASCADE, verbose_name=_('AdoptionNotice'))
    created_at = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return f"{self.owner} - {self.adoption_notice}"


class Log(models.Model):
    """
    Basic class that allows logging random entries for later inspection
    """
    user = models.ForeignKey(User, on_delete=models.CASCADE, verbose_name=_("Nutzer*in"))
    action = models.CharField(max_length=255, verbose_name=_("Aktion"))
    text = models.CharField(max_length=1000, verbose_name=_("Log text"))
    created_at = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return f"[{self.action}] - {self.user} - {self.created_at.strftime('%H:%M:%S %d-%m-%Y ')}"