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

class Sale(models.Model):

    customer = models.CharField(max_length=100)
    date = models.DateField("Date")
    phone = models.CharField(max_length=13, null=True, blank=True)
    description = models.CharField(max_length=255, null=True, blank=True)


class SaleLine(models.Model):

    sale = models.ForeignKey(Sale, on_delete=models.CASCADE)
    product = models.CharField(max_length=100)
    quantity = models.IntegerField(null=True)
    unit_price = models.DecimalField(max_digits=9, decimal_places=2)
    description = models.CharField(max_length=255, null=True, blank=True)

class MeasuringUnits(models.TextChoices):
    UNIT = 'UNIT', _('Unit')

class ProductCategory(models.Model):
    name = models.CharField(max_length=100, unique=True)

    def __str__(self):
        return self.name

class Product(models.Model):
    name = models.CharField(max_length=100, unique=True)
    price = models.DecimalField(max_digits=9, decimal_places=2)
    measuring_unit = models.CharField(
        max_length=20,
        choices=MeasuringUnits.choices,
        default=MeasuringUnits.UNIT
    )
    categories = models.ManyToManyField(ProductCategory)

    def __str__(self):
        return self.name