"""Remove parent_id from item_categories.

Revision ID: 003_drop_category_parent
Revises: 002_inventory_purchase
Create Date: 2026-08-02

"""

from typing import Sequence, Union

import sqlalchemy as sa
from alembic import op

revision: str = "003_drop_category_parent"
down_revision: Union[str, None] = "002_inventory_purchase"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    conn = op.get_bind()
    inspector = sa.inspect(conn)
    columns = [col["name"] for col in inspector.get_columns("item_categories")]
    if "parent_id" in columns:
        op.drop_column("item_categories", "parent_id")


def downgrade() -> None:
    op.add_column(
        "item_categories",
        sa.Column("parent_id", sa.String(length=36), nullable=True),
    )