# -*- coding: utf-8 -*-
"""
Alembic 迁移环境配置
从 app.core.config 动态获取数据库 URL，自动检测 ORM 模型变更。
"""

from logging.config import fileConfig

from alembic import context
from sqlalchemy import engine_from_config, pool

from app.core.config import settings
from app.core.database import Base

# 导入所有模型，确保 Alembic 能检测到它们
import app.models  # noqa: F401

# Alembic Config 对象
config = context.config

# 动态注入数据库 URL (使用同步驱动，因为 Alembic 不支持异步)
config.set_main_option("sqlalchemy.url", settings.DATABASE_URL_SYNC)

# 日志配置
if config.config_file_name is not None:
    fileConfig(config.config_file_name)

# MetaData 对象 - Alembic 通过它检测表结构变更
target_metadata = Base.metadata


def run_migrations_offline() -> None:
    """离线模式：生成 SQL 脚本而不实际连接数据库"""
    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:
    """在线模式：连接数据库并直接执行迁移"""
    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()