"""Remove the retired province destination module.

Revision ID: 0010_remove_destination_module
Revises: 0009_remove_product_domain
Create Date: 2026-08-17
"""

from alembic import op
from sqlalchemy import inspect


revision = "0010_remove_destination_module"
down_revision = "0009_remove_product_domain"
branch_labels = None
depends_on = None


def _drop_referencing_foreign_keys(table_name: str) -> None:
    bind = op.get_bind()
    inspector = inspect(bind)
    for current_table in inspector.get_table_names():
        if current_table == table_name:
            continue
        for foreign_key in inspector.get_foreign_keys(current_table):
            if foreign_key.get("referred_table") != table_name:
                continue
            constraint_name = foreign_key.get("name")
            if constraint_name:
                op.drop_constraint(constraint_name, current_table, type_="foreignkey")


def upgrade() -> None:
    bind = op.get_bind()
    existing_tables = set(inspect(bind).get_table_names())

    for table_name in ("DestinationAlias", "Destination"):
        if table_name not in existing_tables:
            continue
        _drop_referencing_foreign_keys(table_name)
        op.drop_table(table_name)


def downgrade() -> None:
    # The retired destination module has no downgrade path. Restore it from a backup if needed.
    pass