import stripe
from django.apps import apps
from django.db import models
from django.urls import reverse
from django.core.mail import send_mail
from django.utils import timezone as tz
from django.contrib.auth.hashers import make_password
from django.contrib.auth.models import (
    BaseUserManager, AbstractBaseUser, PermissionsMixin
)
from localflavor.us.us_states import USPS_CHOICES


class UserManager(BaseUserManager):
    use_in_migrations = True

    def _create_user(self, email, password, **extra_fields):
        """
        Create and save a user with the given email and password.
        """
        if not email:
            raise ValueError("The given email must be set")
        email = self.normalize_email(email)
        # Lookup the real model class from the global app registry so this
        # manager method can be used in migrations. This is fine because
        # managers are by definition working on the real model.
        GlobalUserModel = apps.get_model(
            self.model._meta.app_label, self.model._meta.object_name
        )
        user = self.model(email=email, **extra_fields)
        user.password = make_password(password)
        user.save(using=self._db)
        return user

    def create_user(self, email, password=None, **extra_fields):
        extra_fields.setdefault("is_staff", False)
        extra_fields.setdefault("is_superuser", False)
        return self._create_user(email, password, **extra_fields)

    def create_superuser(self, email, password=None, **extra_fields):
        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(email, password, **extra_fields)

    def with_perm(
        self, perm, is_active=True, include_superusers=True, backend=None, obj=None
    ):
        if backend is None:
            backends = auth._get_backends(return_tuples=True)
            if len(backends) == 1:
                backend, _ = backends[0]
            else:
                raise ValueError(
                    "You have multiple authentication backends configured and "
                    "therefore must provide the `backend` argument."
                )
        elif not isinstance(backend, str):
            raise TypeError(
                "backend must be a dotted import path string (got %r)." % backend
            )
        else:
            backend = auth.load_backend(backend)
        if hasattr(backend, "with_perm"):
            return backend.with_perm(
                perm,
                is_active=is_active,
                include_superusers=include_superusers,
                obj=obj,
            )
        return self.none()


class User(AbstractBaseUser, PermissionsMixin):
    email = models.EmailField(
        verbose_name="email address",
        max_length=255,
        unique=True,
    )
    first_name = models.CharField("first name", max_length=150, blank=True)
    last_name = models.CharField("last name", max_length=150, blank=True)

    # Shipping address
    shipping_street_address_1 = models.CharField(max_length=256, blank=True)
    shipping_street_address_2 = models.CharField(max_length=256, blank=True)
    shipping_city = models.CharField(max_length=256, blank=True)
    shipping_state = models.CharField(
        max_length=2,
        choices=USPS_CHOICES,
        blank=True
    )
    shipping_postal_code = models.CharField(max_length=20, blank=True)

    is_staff = models.BooleanField(
        "staff status",
        default=False,
        help_text="Designates whether the user can log into this admin site.",
    )
    is_active = models.BooleanField(
        "active",
        default=True,
        help_text="Designates whether this user should be treated as active.\n"
            + "Unselect this instead of deleting accounts."
    )
    date_joined = models.DateTimeField("date joined", default=tz.now)
    stripe_id = models.CharField(max_length=255, blank=True)

    USERNAME_FIELD = "email"
    REQUIRED_FIELDS = []

    objects = UserManager()

    @property
    def has_shipping_address(self):
        if (self.shipping_street_address_1 != ''
            and self.shipping_street_address_2 != ''
            and self.shipping_city != ''
            and self.shipping_state != ''
            and self.shipping_postal_code != ''):
            return True
        return False

    def clean(self):
        super().clean()
        self.email = self.__class__.objects.normalize_email(self.email)

    def get_full_name(self):
        """
        Return the first_name plus the last_name, with a space in between.
        """
        full_name = "%s %s" % (self.first_name, self.last_name)
        return full_name.strip()

    def get_short_name(self):
        """Return the short name for the user."""
        return self.first_name

    def email_user(self, subject, message, from_email=None, **kwargs):
        """Send an email to this user."""
        send_mail(subject, message, from_email, [self.email], **kwargs)

    def get_or_create_stripe_id(self):
        if not self.stripe_id:
            response = stripe.Customer.create(
                name=self.get_full_name(),
                email=self.email
            )
            self.stripe_id = response["id"]
            self.save()
        return self.stripe_id

    def get_absolute_url(self):
        return reverse("storefront:customer-detail", kwargs={"pk": self.pk})