import asyncio
import os
from logging.config import fileConfig

from sqlalchemy.engine import Connection
from sqlalchemy.ext.asyncio import async_engine_from_config

from alembic import context
from fire_planner.db import SCHEMA_NAME, Base

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

db_url = os.environ.get("DB_CONNECTION_STRING")
if db_url:
    config.set_main_option("sqlalchemy.url", db_url)

target_metadata = Base.metadata


def do_run_migrations(connection: Connection) -> None:
    # Alembic's version_table lives inside SCHEMA_NAME, so the schema must
    # exist before context.configure() tries to create alembic_version.
    connection.exec_driver_sql(f'CREATE SCHEMA IF NOT EXISTS "{SCHEMA_NAME}"')
    context.configure(
        connection=connection,
        target_metadata=target_metadata,
        version_table_schema=SCHEMA_NAME,
        include_schemas=True,
    )
    with context.begin_transaction():
        context.run_migrations()


async def run_migrations_online() -> None:
    configuration = config.get_section(config.config_ini_section, {})
    connectable = async_engine_from_config(configuration, prefix="sqlalchemy.")
    async with connectable.connect() as connection:
        await connection.run_sync(do_run_migrations)
        await connection.commit()
    await connectable.dispose()


def run_migrations_offline() -> None:
    context.configure(
        url=config.get_main_option("sqlalchemy.url"),
        target_metadata=target_metadata,
        literal_binds=True,
        version_table_schema=SCHEMA_NAME,
        include_schemas=True,
        dialect_opts={"paramstyle": "named"},
    )
    with context.begin_transaction():
        context.run_migrations()


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