import asyncio
import backend.config as settings
from logging.config import fileConfig

from sqlalchemy.engine import Connection

from alembic import context

from backend.session import engine
from database.stocks.models.base import BaseStocksModel as BaseModel

# 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.
if config.config_file_name is not None:
    fileConfig(config.config_file_name)

# add your model's MetaData object here
# for 'autogenerate' support
# from myapp import mymodel
# target_metadata = mymodel.Base.metadata
target_metadata = BaseModel.metadata
print(target_metadata.schema)


# other values from the config, defined by the needs of env.py,
# can be acquired:
# my_important_option = config.get_main_option("my_important_option")
# ... etc.
def include_object(object, name, type_, reflected, compare_to):
    if type_ == 'table' and object.schema != target_metadata.schema:
        return False
    return True


def get_url():
    url = config.get_main_option("sqlalchemy.url").format(
        PG_LOGIN=settings.PG_LOGIN,
        PG_PASSWORD=settings.PG_PASSWORD,
        PG_HOST=settings.PG_HOST,
        PG_DATABASE=settings.PG_DATABASE,
    )
    return url


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 = get_url()
    context.configure(
        url=url,
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
        version_table_schema=target_metadata.schema,
        include_schemas=True
    )

    with context.begin_transaction():
        """
        By default search_path is setted to "$user",public 
        that why alembic can't create foreign keys correctly
        """
        context.execute('SET search_path TO public')
        context.run_migrations()


def do_run_migrations(connection: Connection) -> None:
    # Here we set our custom schema configuration
    context.configure(
        connection=connection,
        target_metadata=target_metadata,
        version_table="asia_alembic_version",
        # Table in the db which will save the current alembic version of this schema
        version_table_schema=target_metadata.schema,  # Alternative: "public", to put version tables in seperate schema
        include_schemas=True,
        include_object=include_object,
    )
    with context.begin_transaction():
        # context.execute(f'set search_path to {target_metadata.schema}')

        context.run_migrations()


async def run_async_migrations() -> None:
    """In this scenario we need to create an Engine
    and associate a connection with the context.

    """
    connectable = engine

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

    await connectable.dispose()


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

    asyncio.run(run_async_migrations())


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