"""Alembic environment.

生产请用 `alembic upgrade head`；开发/测试可让 ``Settings.auto_create_schema`` 调用
``init_db_schema()``。本文件读取 `app.config.settings`，把 asyncpg URL 转为同步
`psycopg` URL 供 Alembic 使用（仅迁移期间）。
"""

from __future__ import annotations

from logging.config import fileConfig

from alembic import context
from sqlalchemy import engine_from_config, pool

from app.config import settings
import app.db.models  # noqa: F401 - register ORM tables on Base.metadata
from app.db.base import Base


alembic_config = context.config

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

target_metadata = Base.metadata


def _sync_database_url() -> str:
    """把 asyncpg URL 转为同步 psycopg2 URL，避免 Alembic 强依赖 async 驱动。"""
    url = settings.sqlalchemy_database_url
    return url.replace("postgresql+asyncpg://", "postgresql+psycopg://", 1)


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


def run_migrations_online() -> None:
    config_section = alembic_config.get_section(alembic_config.config_ini_section) or {}
    config_section["sqlalchemy.url"] = _sync_database_url()
    connectable = engine_from_config(
        config_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()