from json import dumps

from django.utils.functional import cached_property
from rest_framework.authtoken.models import Token
from phonenumber_field.modelfields import PhoneNumberField

from django.db import models
from django.db.models.signals import post_save
from django.dispatch import receiver
from django.contrib.auth.models import AbstractUser, UserManager as BaseUserManager
from django.contrib.postgres import fields as pgfields
from django.utils.timezone import now
from django.utils.translation import gettext_lazy as _

from api.v1 import serializers
from apps.notification.utils import send_email
from apps.user.tasks import user_to_mixpanel


class UserManager(BaseUserManager):
    use_in_migrations = True

    def _create_user(self, username, email, password, **extra_fields):
        if not username:
            username = email
        if not password:
            password = self.make_random_password()
        email = self.normalize_email(email)
        username = self.model.normalize_username(username)
        user = self.model(username=username, email=email, **extra_fields)
        user.set_password(password)
        user.save(using=self._db)
        return user


class User(AbstractUser):
    USER_ROLE = 0
    AUTHOR_ROLE = 1
    TEACHER_ROLE = 2
    ADMIN_ROLE = 3
    ROLE_CHOICES = (
        (USER_ROLE, 'пользователь'),
        (AUTHOR_ROLE, 'автор'),
        (TEACHER_ROLE, 'преподаватель'),
        (ADMIN_ROLE, 'администратор'),
    )
    NOT_DEFINED = 'n'
    MALE = 'm'
    FEMALE = 'f'
    GENDER_CHOICES = (
        (NOT_DEFINED, 'не указан'),
        (MALE, 'Мужчина'),
        (FEMALE, 'Женщина'),
    )
    email = models.EmailField(_('email address'), unique=True)
    phone = PhoneNumberField(null=True, blank=True, unique=True)
    role = models.PositiveSmallIntegerField(
        'Роль', default=0, choices=ROLE_CHOICES)
    gender = models.CharField(
        'Пол', max_length=1, default='n', choices=GENDER_CHOICES)
    birthday = models.DateField('День рождения', null=True, blank=True)
    country = models.CharField('Страна', max_length=50, null=True, blank=True)
    city = models.CharField('Город', max_length=85, null=True, blank=True)
    about = models.CharField('О себе', max_length=1000, null=True, blank=True)
    instagram = models.URLField(default='', null=True, blank=True)
    instagram_hashtag = models.CharField('Инстаграм хештег', max_length=100, null=True, blank=True)
    facebook = models.URLField(default='', null=True, blank=True)
    twitter = models.URLField(default='', null=True, blank=True)
    pinterest = models.URLField(default='', null=True, blank=True)
    youtube = models.URLField(default='', null=True, blank=True)
    vkontakte = models.URLField('ВКонтакте', default='', null=True, blank=True)
    fb_id = models.BigIntegerField(null=True, blank=True, unique=True)
    fb_data = pgfields.JSONField(default={}, null=True, blank=True)
    is_email_proved = models.BooleanField(
        'Верифицирован по email', default=False
    )
    photo = models.ImageField('Фото', null=True, blank=True, upload_to='users')
    show_in_mainpage = models.BooleanField('Показывать на главной странице', default=False)
    trial_lesson = models.URLField(default='', null=True, blank=True)

    objects = UserManager()

    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = ['username']

    class Meta(AbstractUser.Meta):
        ordering = ('-date_joined',)

    def serialized(self):
        user_data = serializers.user.UserSerializer(instance=self).data
        user_data = dumps(user_data, ensure_ascii=False)
        return user_data

    @cached_property
    def balance(self):
        aggregate = self.balances.filter(
                type=0,
                payment__isnull=False,
                payment__status__isnull=False
            ).aggregate(
            models.Sum('amount'),
            models.Sum('commission'),
        )
        amount = aggregate.get('amount__sum') or 0
        commission = aggregate.get('commission__sum') or 0
        return amount - commission

    @cached_property
    def bonus(self):
        return int(self.bonuses.aggregate(models.Sum('amount')).get('amount__sum')) or 0


@receiver(post_save, sender=User)
def create_auth_token(sender, instance=None, created=False, **kwargs):
    if (
        (instance.is_active or instance.fb_id) and
        instance.role in [User.AUTHOR_ROLE, User.TEACHER_ROLE, User.ADMIN_ROLE] and not
        hasattr(instance, 'auth_token')
    ):
        Token.objects.create(user=instance)
    elif (
        not (instance.is_active or instance.fb_id) or
        instance.role not in [User.AUTHOR_ROLE, User.TEACHER_ROLE, User.ADMIN_ROLE]
    ) and hasattr(instance, 'auth_token'):
        instance.auth_token.delete()


@receiver(post_save, sender=User)
def send_user_info_to_mixpanel(sender, instance=None, created=False, **kwargs):
    user_to_mixpanel.delay(
        instance.id,
        instance.email,
        str(instance.phone),
        instance.first_name,
        instance.last_name,
        instance.date_joined,
        dict(User.ROLE_CHOICES).get(instance.role),
        [subscription.title.lower() for subscription in instance.email_subscription.categories.all()] if hasattr(instance, 'email_subscription') else [],
    )


@receiver(post_save, sender=User)
def auto_create_subscription(sender, instance=None, created=False, **kwargs):
    if created:
        es, created = EmailSubscription.objects.get_or_create(email=instance.email)
        es.user = instance
        es.save()
        instance.email_subscription.categories.set(SubscriptionCategory.objects.filter(auto_add=True))


class AuthorRequestManager(models.Manager):
    def create_by_user(self, user):
        obj = self.model(
            first_name=user.first_name,
            last_name=user.last_name,
            email=user.email,
            about=user.about,
            facebook=user.facebook,
        )
        self._for_write = True
        obj.save(force_insert=True, using=self.db)
        return obj


class AuthorRequest(models.Model):
    PENDING = 0
    ACCEPTED = 1
    DECLINED = 2
    STATUS_CHOICES = (
        (PENDING, 'pending'),
        (ACCEPTED, 'accepted'),
        (DECLINED, 'declined'),
    )

    first_name = models.CharField(_('first name'), max_length=30)
    last_name = models.CharField(_('last name'), max_length=150)
    email = models.EmailField(_('email address'), unique=True)
    about = models.CharField('О себе', max_length=1000, null=True, blank=True)
    facebook = models.URLField(default='', null=True, blank=True)
    status = models.PositiveSmallIntegerField(choices=STATUS_CHOICES, default=PENDING)
    cause = models.TextField('Причина отказа', null=True, blank=True)

    accepted_send_at = models.DateTimeField(null=True, blank=True)
    declined_send_at = models.DateTimeField(null=True, blank=True)
    created_at = models.DateTimeField(auto_now_add=True)
    update_at = models.DateTimeField(auto_now=True)

    objects = AuthorRequestManager()

    class Meta:
        verbose_name = 'Заявка не преподавателя'
        verbose_name_plural = 'Заявки не преподавателя'
        ordering = ('-created_at',)


@receiver(post_save, sender=AuthorRequest)
def handle_authorrequest_update(sender, instance=None, created=False, update_fields=[], **kwargs):
    if not created:
        if instance.status == AuthorRequest.DECLINED and not instance.declined_send_at:
            send_email.delay(
                'Отказ заявки на преподавателя',
                instance.email,
                'notification/email/decline_author.html',
                cause=instance.cause,
            )
            instance.declined_send_at = now()
            instance.save()
        elif instance.status == AuthorRequest.ACCEPTED and not instance.accepted_send_at:
            email = None
            password = None
            try:
                user = User.objects.get(email=instance.email)
            except User.DoesNotExist:
                email = instance.email
                password = User.objects.make_random_password()
                user = User.objects.create(
                    first_name=instance.first_name,
                    last_name=instance.last_name,
                    username=instance.email,
                    email=instance.email,
                    about=instance.about,
                    facebook=instance.facebook,
                    is_active=True,
                    is_email_proved=True,
                )
                user.set_password(password)
            user.role = User.AUTHOR_ROLE
            user.save()
            send_email.delay(
                'Заявка на преподавателя одобрена',
                instance.email,
                'notification/email/accept_author.html',
                email=email,
                password=password,
            )
            instance.accepted_send_at = now()
            instance.save()


class SubscriptionCategory(models.Model):
    title = models.CharField(max_length=100)
    auto_add = models.BooleanField(default=False)

    class Meta:
        verbose_name = 'Категория подписки'
        verbose_name_plural = 'Категории подписки'
        ordering = ('title',)

    def __str__(self):
        return self.title


class EmailSubscription(models.Model):
    ERROR = 0
    SENT = 1
    MAILCHIMP_STATUS_CHOICES = (
        (ERROR, 'error'),
        (SENT, 'sent'),
    )

    user = models.OneToOneField(User, null=True, blank=True, on_delete=models.CASCADE, related_name='email_subscription')
    email = models.EmailField(_('email address'), unique=True)
    categories = models.ManyToManyField(SubscriptionCategory)
    mailchimp_status = models.PositiveSmallIntegerField(choices=MAILCHIMP_STATUS_CHOICES, default=ERROR)


class Referral(models.Model):
    referral = models.OneToOneField(User, on_delete=models.CASCADE, related_name='referral')
    referrer = models.ForeignKey(User, on_delete=models.CASCADE, related_name='referrals')
    bonus = models.IntegerField()
    referrer_bonus = models.IntegerField()
    payment = models.OneToOneField('payment.Payment', null=True, blank=True, on_delete=models.CASCADE)

    class Meta:
        verbose_name = 'Реферал'
        verbose_name_plural = 'Рефералы'

    def send_bonuses(self, referral_bonus, referrer_bonus):
        from apps.payment.models import UserBonus
        UserBonus.objects.create(user=self.referral, amount=referral_bonus, payment=self.payment, referral=self)
        UserBonus.objects.create(user=self.referrer, amount=referrer_bonus, payment=self.payment, referral=self)