import random
from datetime import timedelta

from django.contrib.auth.base_user import BaseUserManager
from django.contrib.auth.models import AbstractUser
from django.contrib.auth.validators import UnicodeUsernameValidator
from django.db import models
from django.utils import timezone
from django.utils.translation import gettext_lazy as _
from rest_framework.exceptions import APIException

from apps.users.constans import MAX_OTP_TRY


class UserManager(BaseUserManager):
    use_in_migrations = True

    def _create_user(self, phone_number=None, username=None, email=None, password=None, **extra_fields):
        if not phone_number and not email:
            raise ValueError('The given phone_number or email must be set')

        email = self.normalize_email(email)
        username = self.model.normalize_username(username)
        # TODO: validate phone number
        user = self.model(phone_number=phone_number, username=username, email=email, **extra_fields)
        user.set_password(password)
        user.set_otp(with_save=False)
        user.set_code()
        user.date_joined = timezone.now()
        user.save(using=self._db)

        return user

    def create_user(self, phone_number=None, username=None, email=None, password=None, **extra_fields):

        extra_fields.setdefault('is_staff', False)
        extra_fields.setdefault('is_superuser', False)

        # TODO create OTP
        return self._create_user(phone_number=phone_number,
                                 username=username,
                                 email=email,
                                 password=password,
                                 **extra_fields)

    def create_superuser(self, username, email, password, **extra_fields):
        if not username:
            raise ValueError('The given username must be set')

        extra_fields.setdefault('is_staff', True)
        extra_fields.setdefault('is_superuser', True)

        if extra_fields.get('is_staff') is not True:
            raise ValueError('Superuser must have is_staff=True.')
        if extra_fields.get('is_superuser') is not True:
            raise ValueError('Superuser must have is_superuser=True.')

        return self._create_user(username=username, email=email, password=password, **extra_fields)


class User(AbstractUser):
    # id
    # first_name
    # last_name
    # email
    # is_staff
    # is_active
    # password

    name = models.CharField(_('name'), max_length=30, blank=True)

    username_validator = UnicodeUsernameValidator()
    username = models.CharField(
        _('username'),
        max_length=150,
        unique=True,
        help_text=_('Required. 150 characters or fewer. Letters, digits and @/./+/-/_ only.'),
        validators=[username_validator],
        error_messages={
            'unique': _("A user with that username already exists."),
        },
        blank=True,
        null=True
    )
    phone_number = models.CharField(_('phone number'), max_length=30, blank=True, null=True, unique=True)
    otp = models.CharField(_('otp'), max_length=6, blank=True, null=True)
    otp_expire = models.DateTimeField(_('otp expire'), blank=True, null=True)
    otp_try = models.IntegerField(_('otp try'), blank=True, null=True, default=0)

    last_checkout_request = models.DateTimeField(_('otp expire'), max_length=30, blank=True, null=True)
    balance = models.IntegerField(_('balance'), default=0)

    iban = models.CharField(null=True, max_length=30, blank=True)
    iban_verified = models.BooleanField(null=True)

    avatar = models.ImageField(upload_to='avatars', null=True, blank=True)
    code = models.IntegerField(_('code'), unique=True, null=True, db_index=True)  # unique random number

    last_update = models.DateTimeField(_('last update'), max_length=30, blank=True, null=True, auto_now=True)
    # last_login
    # date_joined

    objects = UserManager()

    def set_otp(self, with_save=True):
        self.otp = '12345'
        # if self.phone_number in DEVELOPMENT_PHONE_NUMBERS:
        #     self.otp = '12345'
        # else:
        #     self.otp = ''.join(random.choice('0123456789') for _ in range(5))
        self.otp_expire = timezone.now() + timedelta(minutes=5)
        self.otp_try = 0
        if with_save:
            self.save()

    def set_code(self):
        for code in random.sample(range(10000, 100000), 90000):
            try:
                code = str(code)
                self.code = code
                return self.save()
            except:
                pass

        raise APIException('system error')

    def otp_is_valid(self):
        return bool(self.otp and timezone.now() <= self.otp_expire)

    def check_otp(self, otp):
        if self.otp_try <= MAX_OTP_TRY:
            result = otp and self.otp == otp and self.otp_is_valid()
            if result:
                self.otp = None
                self.date_joined = timezone.now()
            else:
                self.otp_try += 1

        else:
            self.otp = None
            result = False

        self.save()
        return result

    def check_auth(self, gateway, value):
        result = False
        if gateway == 'otp':
            result = self.check_otp(value)

        elif gateway == 'password':
            result = self.check_password(value)

        if result:
            self.last_login = timezone.now()
            self.save()

        return result

    def send_otp(self):
        # TODO: some action to sent OTP
        return True

    def __str__(self):
        return f"{self.code} - {self.username}"