from django.contrib.postgres.fields import DateTimeRangeField
from django.db import models
from django.utils.translation import gettext as _
from djmoney.models.fields import MoneyField


class CreatedModifiedAbstract(models.Model):

    modified = models.DateTimeField(auto_now=True, verbose_name=_("modified"))
    created = models.DateTimeField(auto_now_add=True, verbose_name=_("created"))

    class Meta:
        abstract = True


class Membership(CreatedModifiedAbstract):
    """
    A user remains a member of an organization even though the subscription is
    unpaid or renewed. This just changes the status/permissions etc. of the
    membership, thus we need to track subscription creation, expiry, renewals
    etc. and ensure that the membership is modified accordingly.
    """

    user = models.OneToOneField("auth.User", on_delete=models.PROTECT)

    def __str__(self):
        return _(f"{self.user.get_full_name()} is a member")

    class Meta:
        verbose_name = _("membership")
        verbose_name_plural = _("memberships")


class SubscriptionType(CreatedModifiedAbstract):
    """
    Properties of subscriptions are stored here. Should of course not be edited
    after subscriptions are created.
    """

    name = models.CharField(verbose_name=_("name"), max_length=64)

    fee = MoneyField(max_digits=16, decimal_places=2)

    fee_vat = MoneyField(max_digits=16, decimal_places=2, default=0)

    class Meta:
        verbose_name = _("subscription type")
        verbose_name_plural = _("subscription types")


class Subscription(CreatedModifiedAbstract):
    """
    To not confuse other types of subscriptions, one can be a *subscribed*
    member, meaning that they are paying etc.

    A subscription does not track payment, this is done in the accounting app.
    """

    subscription_type = models.ForeignKey(
        SubscriptionType,
        related_name="memberships",
        verbose_name=_("subscription type"),
        on_delete=models.PROTECT,
    )
    user = models.ForeignKey("auth.User", on_delete=models.PROTECT)

    active = models.BooleanField(
        default=False,
        verbose_name=_("active"),
        help_text=_("Automatically set by payment system."),
    )

    duration = DateTimeRangeField(help_text=_("The duration this subscription is for. "))

    class Meta:
        verbose_name = _("subscription")
        verbose_name_plural = _("subscriptions")