from django.db import models
from django.urls import reverse


class Ingredient(models.Model):
    nom = models.CharField("Nom", max_length=200)

    def __str__(self):
        return self.nom


class Unite(models.Model):
    nom = models.CharField("Unité", max_length=200)

    def __str__(self):
        return self.nom


class Recette(models.Model):
    nom = models.CharField("Nom", max_length=200)
    photo = models.ImageField("Photo", upload_to='photos', blank=True)
    nb_pers = models.IntegerField(default=4)
    prep = models.TextField("Préparation", blank=True)
    source = models.CharField("Source", max_length=200, blank=True)
    ingredients = models.ManyToManyField(Ingredient, through='Composition', blank=True)

    def __str__(self):
        return self.nom

    def get_absolute_url(self):
        return reverse('recette', args=[self.pk])


class Composition(models.Model):
    recette = models.ForeignKey(Recette, on_delete=models.CASCADE)
    ingredient = models.ForeignKey(Ingredient, on_delete=models.PROTECT)
    quantite = models.DecimalField(max_digits=6, decimal_places=3, null=True, blank=True)
    unite = models.ForeignKey(Unite, null=True, blank=True, on_delete=models.PROTECT)