"""Alembic environment.

We bypass `alembic.ini`'s `sqlalchemy.url` and pull the URL from the project's
Pydantic settings so a single .env governs both runtime and migrations.

Importing `app.models` registers every model on `Base.metadata`.
"""

from __future__ import annotations

from logging.config import fileConfig

from alembic import context
from sqlalchemy import engine_from_config, pool

# noqa: F401 — registers models on Base.metadata
from app import models as _models  # noqa: F401
from app.core.config import settings
from app.db.base import Base

config = context.config

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

# Inject the DB URL at runtime.
config.set_main_option("sqlalchemy.url", settings.database_url)

target_metadata = Base.metadata


def include_object(_object, _name, type_, _reflected, _compare_to):  # type: ignore[no-untyped-def]
    """Skip alembic's internal version table from autogenerate diffs."""
    if type_ == "table" and _name == "alembic_version":
        return False
    return True


def run_migrations_offline() -> None:
    """Generate SQL without an engine — useful for review."""
    context.configure(
        url=config.get_main_option("sqlalchemy.url"),
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
        include_object=include_object,
        compare_type=True,
        compare_server_default=True,
    )
    with context.begin_transaction():
        context.run_migrations()


def run_migrations_online() -> None:
    """Apply migrations against a live DB."""
    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,
            include_object=include_object,
            compare_type=True,
            compare_server_default=True,
        )
        with context.begin_transaction():
            context.run_migrations()


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