from django.db import models
from django.utils.dates import MONTHS_3
from django.utils.translation import gettext_lazy as _

from polymorphic.models import PolymorphicModel


class Order(models.Model):
    """
    An example order that has polymorphic relations
    """

    title = models.CharField(_("Title"), max_length=200)

    class Meta:
        verbose_name = _("Organisation")
        verbose_name_plural = _("Organisations")
        ordering = ("title",)

    def __str__(self):
        return self.title


class Payment(PolymorphicModel):
    """
    A generic payment model.
    """

    order = models.ForeignKey(Order, on_delete=models.CASCADE)
    currency = models.CharField(default="USD", max_length=3)
    amount = models.DecimalField(max_digits=10, decimal_places=2)

    class Meta:
        verbose_name = _("Payment")
        verbose_name_plural = _("Payments")

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


class CreditCardPayment(Payment):
    """
    Credit card
    """

    MONTH_CHOICES = [(i, n) for i, n in sorted(MONTHS_3.items())]

    card_type = models.CharField(max_length=10)
    expiry_month = models.PositiveSmallIntegerField(choices=MONTH_CHOICES)
    expiry_year = models.PositiveIntegerField()

    class Meta:
        verbose_name = _("Credit Card Payment")
        verbose_name_plural = _("Credit Card Payments")


class BankPayment(Payment):
    """
    Payment by bank
    """

    bank_name = models.CharField(max_length=100)
    swift = models.CharField(max_length=20)

    class Meta:
        verbose_name = _("Bank Payment")
        verbose_name_plural = _("Bank Payments")


class SepaPayment(Payment):
    """
    Payment by SEPA (EU)
    """

    iban = models.CharField(max_length=34)
    bic = models.CharField(max_length=11)

    class Meta:
        verbose_name = _("SEPA Payment")
        verbose_name_plural = _("SEPA Payments")