"""Add banned_until field

Revision ID: 016_add_banned_until
Revises: 015_add_static_content
Create Date: 2024-12-19

"""
from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa
from sqlalchemy import inspect


# revision identifiers, used by Alembic.
revision: str = '016_add_banned_until'
down_revision: Union[str, None] = '015_add_static_content'
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def column_exists(table_name: str, column_name: str) -> bool:
    bind = op.get_bind()
    inspector = inspect(bind)
    columns = [col['name'] for col in inspector.get_columns(table_name)]
    return column_name in columns


def upgrade() -> None:
    if not column_exists('users', 'banned_until'):
        op.add_column('users', sa.Column('banned_until', sa.DateTime(), nullable=True))


def downgrade() -> None:
    if column_exists('users', 'banned_until'):
        op.drop_column('users', 'banned_until')
