from __future__ import annotations

from logging.config import fileConfig
from typing import Any, Dict

from alembic import context
from sqlalchemy import engine_from_config, pool

from backend.app.core.config import get_settings
from backend.app.db.models import Base

# this is the Alembic Config object, which provides
# access to the values within the .ini file in use.
config = context.config

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

# add your model's MetaData object here for 'autogenerate' support
# from myapp import mymodel
# target_metadata = mymodel.Base.metadata
# target_metadata = None

target_metadata = Base.metadata


def get_run_options() -> Dict[str, Any]:
    settings = get_settings()
    return {"url": settings.database_url}


def run_migrations_offline() -> None:
    """Run migrations in 'offline' mode."""

    kwargs = get_run_options()
    context.configure(
        url=kwargs["url"],
        target_metadata=target_metadata,
        literal_binds=True,
        compare_type=True,
        dialect_opts={"paramstyle": "named"},
    )

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


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

    kwargs = get_run_options()
    connectable = engine_from_config(
        config.get_section(config.config_ini_section, {}),
        prefix="sqlalchemy.",
        poolclass=pool.NullPool,
        url=kwargs["url"],
    )

    with connectable.connect() as connection:
        context.configure(
            connection=connection, target_metadata=target_metadata, compare_type=True
        )

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


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