"""
Alembic 迁移环境配置
支持异步数据库连接
"""

from logging.config import fileConfig

from alembic import context
from sqlalchemy import engine_from_config, pool

# 导入所有 ORM 模型以确保 Base.metadata 包含完整的表定义
from app.models.base import Base

# Alembic Config 对象
config = context.config

# 设置日志
if config.config_file_name is not None:
    fileConfig(config.config_file_name)

# 元数据目标，用于自动生成迁移
target_metadata = Base.metadata


def run_migrations_offline() -> None:
    """
    以 'offline' 模式运行迁移。
    只需要 URL，不需要 Engine。调用 context.execute() 将迁移
    直接发送到数据库。
    """
    url = config.get_main_option("sqlalchemy.url")
    context.configure(
        url=url,
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
    )

    with context.begin_transaction():
        context.run_migrations()


def run_migrations_online() -> None:
    """
    以 'online' 模式运行迁移。
    创建 Engine 并关联 connection 到 context。
    """
    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()