import os
import shutil

from django.apps import AppConfig
from django.conf import settings


class MainConfig(AppConfig):
    default_auto_field = "django.db.models.BigAutoField"
    name = "project.main"

    def ready(self):
        """copy template database if db not exists"""

        db_fname = settings.DATABASES["default"]["NAME"]
        template_db_fname = settings.BASE_DIR / "db.template.sqlite3"

        if os.path.exists(db_fname):
            return

        shutil.copyfile(template_db_fname, db_fname)