from logging.config import fileConfig
import os
from sqlalchemy import create_engine, pool
from sqlalchemy.ext.asyncio import AsyncEngine, create_async_engine
from sqlalchemy.engine import engine_from_config
from alembic import context
import asyncio

# Import Base and all models
from app.core.database import Base
from app.models import tenant  # Import all models explicitly

# Alembic Config object
config = context.config

# Logging configuration
if config.config_file_name:
    fileConfig(config.config_file_name)

# Get DATABASE_URL and convert to synchronous
DATABASE_URL = os.getenv("DATABASE_URL")
if not DATABASE_URL:
    raise RuntimeError("DATABASE_URL environment variable is not set")

SYNC_DATABASE_URL = DATABASE_URL.replace("+asyncpg", "")

# Metadata for autogenerate
target_metadata = Base.metadata


def run_migrations_offline():
    """
    Run migrations in 'offline' mode.
    """
    context.configure(
        url=SYNC_DATABASE_URL,
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
    )

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


async def run_migrations_online():
    """
    Run migrations in 'online' mode.
    """
    # Fetch the URL from Alembic configuration
    alembic_config = config.get_section(config.config_ini_section)
    alembic_config["sqlalchemy.url"] = DATABASE_URL  # Use async URL

    connectable: AsyncEngine = create_async_engine(
        DATABASE_URL,
        poolclass=pool.NullPool,
    )

    async with connectable.connect() as connection:
        await connection.run_sync(
            lambda sync_connection: context.configure(
                connection=sync_connection, target_metadata=target_metadata,
                compare_type=True  # Ensure column types are compared
            )
        )
        await connection.run_sync(context.run_migrations())

    asyncio.run(do_run_migrations())


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