import asyncio
from logging.config import fileConfig

from alembic import context
from sqlalchemy import engine_from_config, pool
from sqlalchemy.ext.asyncio import AsyncEngine
from sqlalchemy.ext.asyncio.engine import AsyncConnection

# This is a required step by Alembic to properly generate migrations
import src.orm
from src.settings import CONFIG

target_metadata = src.orm.base.Base.metadata

# this is the Alembic Config object, which provides
# access to the values within the .ini file in use.
config = context.config

# Interpret the config file for Python logging.
# This line sets up loggers basically.
fileConfig(config.config_file_name)
config.set_main_option("sqlalchemy.url", CONFIG.database_url.get_secret_value())


def run_migrations_offline() -> None:
    """
    Run migrations in 'offline' mode.

    This configures the context with just a URL
    and not an Engine, though an Engine is acceptable
    here as well.  By skipping the Engine creation
    we don't even need a DBAPI to be available.

    Calls to context.execute() here emit the given string to the
    script output.

    """
    url = config.get_main_option("sqlalchemy.url")
    context.configure(
        url=url,
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
    )

    with context.begin_transaction():
        context.run_migrations()


def do_run_migrations(connection: AsyncConnection) -> None:
    """Run all migrations on the given connection."""
    context.configure(
        connection=connection,
        target_metadata=target_metadata,
        compare_type=True,
        compare_server_default=True,
    )

    with context.begin_transaction():
        context.run_migrations()


async def run_migrations_online() -> None:
    """
    Run migrations in 'online' mode.

    In this scenario we need to create an Engine
    and associate a connection with the context.
    """
    connectable = AsyncEngine(
        engine_from_config(
            config.get_section(config.config_ini_section),
            prefix="sqlalchemy.",
            poolclass=pool.NullPool,
            future=True,
        ),
    )

    async with connectable.connect() as connection:
        await connection.run_sync(do_run_migrations)


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