python-tdd/src/apps/lyric/models.py

import uuid

from datetime import timedelta
from django.contrib.auth.base_user import AbstractBaseUser, BaseUserManager
from django.db import models
from django.db.models.signals import post_save
from django.dispatch import receiver
from django.utils import timezone


class UserManager(BaseUserManager):
    def create_user(self, email):
        user = self.model(email=email)
        user.set_unusable_password()
        user.save(using=self._db)
        return user

    def create_superuser(self, email, password):
        user = self.model(email=email, is_staff=True, is_superuser=True)
        user.set_password(password)
        user.save(using=self._db)
        return user

class LoginToken(models.Model):
    email = models.EmailField()
    uid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)

class User(AbstractBaseUser):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    email = models.EmailField(unique=True)
    username = models.CharField(max_length=35, unique=True, null=True, blank=True)
    searchable = models.BooleanField(default=False)
    palette = models.CharField(max_length=32, default="palette-default")

    is_staff = models.BooleanField(default=False)
    is_superuser = models.BooleanField(default=False)

    objects = UserManager()
    REQUIRED_FIELDS = []
    USERNAME_FIELD = "email"

    def has_perm(self, perm, obj=None):
        return self.is_superuser
    
    def has_module_perms(self, app_label):
        return self.is_superuser
    
class Wallet(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE, related_name="wallet")
    writs = models.IntegerField(default=0)
    esteem = models.IntegerField(default=0)

class Token(models.Model):
    COIN = "coin"
    FREE = "Free"
    TITHE = "tithe"
    TOKEN_TYPE_CHOICES = [
        (COIN, "Coin-on-a-String"),
        (FREE, "Free Token"),
        (TITHE, "Tithe Token"),
    ]

    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name="tokens")
    token_type = models.CharField(max_length=8, choices=TOKEN_TYPE_CHOICES)
    expires_at = models.DateTimeField(null=True, blank=True)

    def tooltip_text(self):
        if self.token_type == self.COIN:
            return (
                "Coin-on-a-String: Admit 1 Entry"
                " (and another after that, and another after that\u2026)"
                " \u2014 no expiry"
            )
        if self.token_type == self.FREE:
            return (
                f"Free Token: Admit 1 Entry"
                f" \u2014 Expires {self.expires_at.strftime('%Y-%m-%d')}"
            )
        return self.get_token_type_display()
    
@receiver(post_save, sender=User)
def create_wallet_and_tokens(sender, instance, created, **kwargs):
    if not created:
        return
    Wallet.objects.create(user=instance, writs=144)
    Token.objects.create(user=instance, token_type=Token.COIN)
    Token.objects.create(
        user=instance,
        token_type=Token.FREE,
        expires_at=timezone.now() + timedelta(days=7),
    )