from __future__ import annotations

import asyncio
from logging.config import fileConfig
import os
from pathlib import Path

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

from alembic import context

# Add project root to sys.path for module imports
import sys
ROOT_DIR = Path(__file__).resolve().parents[1]
if str(ROOT_DIR) not in sys.path:
    sys.path.insert(0, str(ROOT_DIR))

from app.models.database import Base, metadata_obj, DATABASE_URL  # noqa: E402

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

# Override sqlalchemy.url from environment if provided
url_from_env = os.environ.get("DATABASE_URL")
if url_from_env:
    config.set_main_option("sqlalchemy.url", url_from_env)
else:
    config.set_main_option("sqlalchemy.url", str(DATABASE_URL))

# add your model's MetaData object here
# for 'autogenerate' support
# from myapp import mymodel
# target_metadata = mymodel.Base.metadata
target_metadata = metadata_obj


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,
    )

    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,
    )

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


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

    connectable = async_engine_from_config(
        config.get_section(config.config_ini_section, {}),
        prefix="sqlalchemy.",
        poolclass=pool.NullPool,
        future=True,
    )

    async def async_main() -> None:
        async with connectable.connect() as connection:
            await connection.run_sync(do_run_migrations)
        await connectable.dispose()

    asyncio.run(async_main())


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