migrations/env.py

"""
Alembic migrations environment for CX AI Agent
"""
import asyncio
import os
import sys
from logging.config import fileConfig

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

from alembic import context

# Add parent directory to path
sys.path.insert(0, os.path.dirname(os.path.dirname(__file__)))

# Import models
from mcp.database.models import Base

# Alembic Config object
config = context.config

# Interpret the config file for Python logging
if config.config_file_name is not None:
    fileConfig(config.config_file_name)

# Add metadata
target_metadata = Base.metadata

# Get database URL from environment or use default
database_url = os.getenv("DATABASE_URL", "sqlite+aiosqlite:///./data/cx_agent.db")

# Convert postgres:// to postgresql:// for SQLAlchemy
if database_url.startswith("postgres://"):
    database_url = database_url.replace("postgres://", "postgresql+asyncpg://", 1)

# Override sqlalchemy.url in alembic config
config.set_main_option("sqlalchemy.url", database_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 = 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: Connection) -> None:
    """Run migrations with 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_async_migrations() -> None:
    """Run migrations in 'online' mode with async engine"""

    configuration = config.get_section(config.config_ini_section)
    configuration["sqlalchemy.url"] = database_url

    connectable = async_engine_from_config(
        configuration,
        prefix="sqlalchemy.",
        poolclass=pool.NullPool,
    )

    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()