"""Alembic environment configuration for async SQLAlchemy.

This file is auto-generated by Facet and configured for async database operations.
It automatically discovers models from all features in the features/ directory.
"""

import asyncio
import importlib
import sys
from logging.config import fileConfig
from pathlib import Path

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

# Add project root to path so imports work
sys.path.insert(0, str(Path(__file__).parents[2]))

from db.database import Base
from settings import settings

# 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)

# Auto-discover and import models from all features
# This ensures all models are registered with Base.metadata
features_dir = Path(__file__).parents[2] / "features"
if features_dir.exists():
    for feature_dir in features_dir.iterdir():
        if feature_dir.is_dir() and (feature_dir / "models.py").exists():
            module_name = f"features.{feature_dir.name}.models"
            try:
                importlib.import_module(module_name)
            except ImportError as e:
                print(f"Warning: Could not import {module_name}: {e}")

# Set target metadata for autogenerate support
target_metadata = Base.metadata

# Override sqlalchemy.url from settings
config.set_main_option("sqlalchemy.url", settings.database_url)


def process_revision_directives(context, revision, directives):
    """Prevent generation of empty migrations."""
    if config.cmd_opts and config.cmd_opts.autogenerate:
        script = directives[0]
        if script.upgrade_ops.is_empty():
            directives[:] = []
            print("No changes detected, skipping migration generation.")


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"},
        process_revision_directives=process_revision_directives,
    )

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


def do_run_migrations(connection: Connection) -> None:
    """Run migrations with the given connection."""
    context.configure(
        connection=connection,
        target_metadata=target_metadata,
        process_revision_directives=process_revision_directives,
    )

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


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

    In this scenario we need to create an Engine
    and associate a connection with the context.
    """
    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()
