from datetime import timedelta
import random
from django.db import models
from django.contrib.auth.models import User
from django.utils.translation import gettext as _

def generate_random_url():
    # a-z, A-Z, 0-9, -, _
    characters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_'
    return ''.join(random.choice(characters) for i in range(6))

class Event(models.Model):
    url = models.CharField(max_length=6, default=generate_random_url, unique=True)
    name = models.CharField(max_length=255)
    slot_interval = models.DurationField(default=timedelta(minutes=15))
    created_at = models.DateTimeField(auto_now_add=True)
    start_time = models.TimeField(default='09:00')
    end_time = models.TimeField(default='20:00')

class Date(models.Model):
    event = models.ForeignKey(Event, on_delete=models.CASCADE)
    date = models.DateField()

class Participant(models.Model):
    name = models.CharField(max_length=255)
    event = models.ForeignKey(Event, on_delete=models.CASCADE)
    user = models.ForeignKey(User, on_delete=models.CASCADE, null=True, blank=True)
    slots = models.BinaryField()