"""Alembic environment configuration for training service"""

import asyncio
import logging
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 the service directory to the Python path
service_path = os.path.abspath(os.path.join(os.path.dirname(__file__), ".."))
if service_path not in sys.path:
    sys.path.insert(0, service_path)

# Add shared modules to path
shared_path = os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "..", "shared"))
if shared_path not in sys.path:
    sys.path.insert(0, shared_path)

try:
    from app.core.config import settings
    from shared.database.base import Base

    # Import all models to ensure they are registered with Base.metadata
    from app.models import *  # Import all models

except ImportError as e:
    print(f"Import error in migrations env.py: {e}")
    print(f"Current Python path: {sys.path}")
    raise

# this is the Alembic Config object
config = context.config

# Set database URL from settings if not already set
database_url = os.getenv('DATABASE_URL') or getattr(settings, 'DATABASE_URL', None)
if database_url:
    config.set_main_option("sqlalchemy.url", database_url)

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

# Set target metadata
target_metadata = Base.metadata

def run_migrations_offline() -> None:
    """Run migrations in 'offline' mode."""
    url = config.get_main_option("sqlalchemy.url")
    context.configure(
        url=url,
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
        compare_type=True,
        compare_server_default=True,
    )

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

def do_run_migrations(connection: Connection) -> None:
    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."""
    connectable = async_engine_from_config(
        config.get_section(config.config_ini_section, {}),
        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()