"""Alembic environment.

At milestone 0.1 the metadata is empty (no models yet). Milestones 0.5 and 0.6
register real and stub entity models, at which point `target_metadata` will
carry their tables. `alembic upgrade head` currently applies a no-op baseline.
"""

from __future__ import annotations

from logging.config import fileConfig

from alembic import context
from sqlalchemy import engine_from_config, pool

from ypms.db import Base
from ypms.settings import get_settings

# ---- Import model modules here so Base.metadata is populated ----
# (empty at milestone 0.1; entities register themselves via later milestones)

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

config.set_main_option("sqlalchemy.url", get_settings().database_url)
target_metadata = Base.metadata


def run_migrations_offline() -> None:
    context.configure(
        url=config.get_main_option("sqlalchemy.url"),
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
    )
    with context.begin_transaction():
        context.run_migrations()


def run_migrations_online() -> None:
    connectable = engine_from_config(
        config.get_section(config.config_ini_section, {}),
        prefix="sqlalchemy.",
        poolclass=pool.NullPool,
    )
    with connectable.connect() as connection:
        context.configure(connection=connection, target_metadata=target_metadata)
        with context.begin_transaction():
            context.run_migrations()


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