from django.db import models
from django.contrib.auth.models import User

import uuid


class AbstractModel(models.Model):
    class Meta:
        abstract = True

    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)


class Wishlist(AbstractModel):

    name = models.CharField(max_length=255)
    description = models.TextField()
    external_id = models.UUIDField(unique=True, default=uuid.uuid4, editable=False)

    @staticmethod
    def create(name, description):
        w = Wishlist()
        w.name = name
        w.description = description
        w.save()
        return w


class Wish(AbstractModel):

    wishlist = models.ForeignKey(Wishlist, related_name='items')
    name = models.CharField(max_length=255)
    description = models.TextField()
    picture = models.ImageField(null=True)
    numbers_available = models.IntegerField(default=1)
    number_of_parts = models.IntegerField(null=True)
    estimated_price = models.DecimalField(max_digits=19, decimal_places=2,
                                          null=True)

    @staticmethod
    def create(name, description, wishlist):
        i = Wish()
        i.name = name
        i.description = description
        i.wishlist = wishlist
        i.save()
        return i

    @property
    def percentage(self):
        """
        Calcule le pourcentage de complétion pour un élément.
        """
        number_of_linked_parts = Part.objects.filter(wish=self).count()
        total = self.number_of_parts * self.numbers_available
        percentage = (number_of_linked_parts / total)
        return percentage * 100

class Part(models.Model):
    wish = models.ForeignKey('Wish')
    user = models.ForeignKey(User)

    def save(self, force_insert=False, force_update=False, commit=True):
        pass