import datetime

from django.db import models

from django.utils import timezone

class Grouped_order(models.Model):
    name = models.CharField(max_length=100, null=True)  # optionnal
    orga = models.CharField(max_length=100) # a changer, utiliser ForeignKey de user
    delivery_date = models.DateField('Date de livraison')
    deadline = models.DateTimeField('Date limite de commande')

    def is_ongoing(self):
        """Returns True if the grouped order is open for new Orders - False if it's too late"""
        return self.deadline >= timezone.now()

    def __str__(self):
        return self.name if self.name else f"Commande groupée {self.pk} du {self.date} organisée par {self.orga}"

class Order(models.Model):
    grouped_order = models.ForeignKey(Grouped_order, on_delete=models.CASCADE,related_name="order_set")
    author = models.CharField(max_length=100, verbose_name='Personne qui passe la commande') # a changer, utiliser ForeignKey de user
    def __str__(self):
        return f"Commande de {self.author} pour la commande groupée {self.grouped_order.pk}"

class Item(models.Model):
    name = models.CharField(max_length=100)
    grouped_order = models.ForeignKey(Grouped_order, on_delete=models.CASCADE)      # à transformer en manytomany quand il y aura un catalogue
    ordered_nb = models.IntegerField(default=0)

    def __str__(self):
        return f"{self.name} dans la commande groupée {self.grouped_order.pk}"

class OrderedItem(models.Model):
    """Item in one specific Order, and its number"""
    nb = models.PositiveSmallIntegerField(default=0) # works up to 32767
    order = models.ForeignKey(Order, on_delete=models.CASCADE, related_name="ordered_items")
    item = models.ForeignKey(Item, on_delete=models.CASCADE, related_name="orders")
    def __str__(self):
        return f"{self.nb} {self.item}, dans la commande {self.order.pk}"