"""Alembic 迁移环境。"""

from logging.config import fileConfig
from pathlib import Path
import sys

from alembic import context
from sqlalchemy import engine_from_config, pool

ROOT_DIR = Path(__file__).resolve().parents[3]
if str(ROOT_DIR) not in sys.path:
    sys.path.insert(0, str(ROOT_DIR))

from web.backend.database import Base, DATABASE_URL  # noqa: E402
from web.backend import models  # noqa: F401,E402

config = context.config
config.set_main_option("sqlalchemy.url", DATABASE_URL)

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

target_metadata = Base.metadata


def run_migrations_offline() -> None:
    """离线模式生成 SQL。"""
    context.configure(
        url=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:
    """在线模式直接执行迁移。"""
    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()