import sqlalchemy as sa

from lapp import create_app
from models import Group, Item, ListOfItems, Shared, User, db
from secrets_config import load_secrets


def has_rows(model):
    primary_key = next(iter(model.__table__.primary_key.columns))
    return db.session.scalar(sa.select(primary_key).limit(1)) is not None


def initialize(app):
    initial_data = load_secrets(app.instance_path)["initial_data"]

    with app.app_context():
        with db.session.begin():
            if has_rows(User):
                return False

            partially_populated = [
                model.__tablename__
                for model in (Group, ListOfItems, Item, Shared)
                if has_rows(model)
            ]
            if partially_populated:
                tables = ", ".join(partially_populated)
                raise RuntimeError(
                    "Refusing to initialize a partially populated database. "
                    f"These tables contain data while user is empty: {tables}"
                )

            admin_group = Group(secret=initial_data["admin_group"])
            user_group = Group(secret=initial_data["user_group"])
            db.session.add_all([admin_group, user_group])
            db.session.flush()

            admin = User(
                name="admin",
                group_id=admin_group.id,
                is_admin=True,
                is_approved=True,
                is_private=True,
            )
            admin.set_password(initial_data["admin_password"])

            user = User(
                name="ignace",
                group_id=user_group.id,
                is_admin=False,
                is_approved=True,
            )
            user.set_password(initial_data["user_password"])
            db.session.add_all([admin, user])
            db.session.flush()

            groceries = ListOfItems(
                owner_user_id=user.id,
                name="Supermarkt",
                is_active=True,
            )
            chores = ListOfItems(
                owner_user_id=user.id,
                name="Klusjes",
                is_active=True,
            )
            db.session.add_all([groceries, chores])
            db.session.flush()

            db.session.add_all([
                Item(listofitems_id=groceries.id, label="Stokbrood"),
                Item(
                    listofitems_id=groceries.id,
                    label="Speltbroodje",
                    category="Brood",
                ),
                Item(
                    listofitems_id=groceries.id,
                    label="Boter",
                    category="Zuivel",
                    unit="x",
                    quantity=1,
                ),
                Item(
                    listofitems_id=groceries.id,
                    label="Notenbroodjes",
                    is_checked=True,
                ),
            ])

    return True


def main():
    app = create_app()
    if initialize(app):
        print("Created initial credentials from instance/secrets.yaml")
    else:
        print("Database already contains users; no initial data was added")


if __name__ == "__main__":
    main()