"""
control/migrations/env.py
-------------------------
Standalone Alembic environment for the control plane. Unlike the data-plane
env (which pulls its engine from the Flask app), this reads the URL directly
from CONTROL_DATABASE_URL and targets ControlBase.metadata. No Flask import.
"""

import os
import sys
from logging.config import fileConfig

from sqlalchemy import engine_from_config, pool
from alembic import context

# Make the repo root importable so `import control.*` resolves when Alembic
# is invoked as `alembic -c control/migrations/alembic.ini ...`.
sys.path.insert(
    0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..', '..'))
)

from control.base import ControlBase, get_control_database_url  # noqa: E402
import control.models  # noqa: E402,F401  (registers tables on ControlBase.metadata)

config = context.config
if config.config_file_name is not None:
    fileConfig(config.config_file_name)

# Inject the URL from the environment (escape % for ConfigParser).
config.set_main_option(
    'sqlalchemy.url', get_control_database_url().replace('%', '%%')
)

target_metadata = ControlBase.metadata


def run_migrations_offline():
    context.configure(
        url=config.get_main_option('sqlalchemy.url'),
        target_metadata=target_metadata,
        literal_binds=True,
        compare_type=True,
    )
    with context.begin_transaction():
        context.run_migrations()


def run_migrations_online():
    connectable = engine_from_config(
        config.get_section(config.config_ini_section, {}),
        prefix='sqlalchemy.',
        poolclass=pool.NullPool,
    )
    with connectable.connect() as connection:
        context.configure(
            connection=connection,
            target_metadata=target_metadata,
            compare_type=True,
        )
        with context.begin_transaction():
            context.run_migrations()


if context.is_offline_mode():
    run_migrations_offline()
else:
    run_migrations_online()