"""Alembic environment — wires SQLAlchemy models into the migration engine."""

import os
from logging.config import fileConfig

from alembic import context
from sqlalchemy import engine_from_config, pool

# Load app models so Alembic can inspect metadata
from app.database import Base  # noqa: F401 — registers Base.metadata
import app.models  # noqa: F401 — registers all ORM classes

# ── Alembic Config object ─────────────────────────────────────────────────────
config = context.config
if config.config_file_name is not None:
    fileConfig(config.config_file_name)

# Inject DATABASE_URL from environment so it is never hard-coded
database_url = os.environ["DATABASE_URL"]
config.set_main_option("sqlalchemy.url", database_url)

target_metadata = Base.metadata


# ── Offline migrations (no live DB connection) ────────────────────────────────
def run_migrations_offline() -> None:
    context.configure(
        url=database_url,
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
        compare_type=True,
    )
    with context.begin_transaction():
        context.run_migrations()


# ── Online migrations (live DB connection) ────────────────────────────────────
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,
            compare_type=True,
        )
        with context.begin_transaction():
            context.run_migrations()


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