from django.db import models

import random
import string

from django.db.models.fields import CharField, IntegerField, TextField, BooleanField, DateTimeField
from django.db.models.fields.json import JSONField
from users.models import CustomUser
# Create your models here.


def generate_unique_code_step():
    length = 6

    while True:
        code = ''.join(random.choices(string.ascii_uppercase, k=length))
        if Exercice.objects.filter(id_code=code).count() == 0:
            break

    return code


def generate_unique_code_tag():
    length = 6

    while True:
        code = ''.join(random.choices(string.ascii_uppercase, k=length))
        if Tag.objects.filter(id_code=code).count() == 0:
            break

    return code


class Tag(models.Model):
    color = CharField(max_length=50, default='')
    id_code = CharField(max_length=50, unique=True,
                        default=generate_unique_code_tag)
    user = models.ForeignKey('users.CustomUser', null=True, on_delete=models.CASCADE)
    name = CharField(max_length=25, default='')



def exo_code(instance, filename):
    return f'uploads/exercices/exo_{instance.id_code}/{filename}'


class ExerciceManager(models.Manager):
    def delete(self):
        for obj in self.get_queryset():
            obj.delete()



class Exercice(models.Model):
    name = CharField(max_length=50)
    id_code = CharField(
        unique=True, max_length=50, default=generate_unique_code_step)
    exo_model = models.FileField(upload_to=exo_code)
    consigne = CharField(max_length=100, default='', blank=True)
    tags = models.ManyToManyField(Tag)
    exemple = JSONField(default=dict)
    
    isPdf = BooleanField(default=True)
    isCsv = BooleanField(default=True)
    isWeb = BooleanField(default=True)
    
    last_update = DateTimeField(auto_now_add=True)
    
    original = BooleanField(default=True)
    origin = models.ForeignKey('self', null=True, on_delete = models.SET_NULL)
    
    private = BooleanField(default=False)
    
    author = models.ForeignKey(CustomUser, null=True, on_delete=models.CASCADE)
    
    objects = ExerciceManager()
    
    def delete(self, using=None, keep_parents=False):
        self.exo_model.storage.delete(self.exo_model.name)
        super().delete()