"""
同步 users 表缺失列（适配当前模型定义）。

- 逐列检查 INFORMATION_SCHEMA，缺失则执行 ALTER TABLE 添加
- 避免一次性重建表，降低风险

运行方式：
  cd kaopeilian-backend && python3 scripts/sync_users_table.py
"""
import asyncio
import sys
from pathlib import Path

# 确保可导入应用配置
sys.path.append(str(Path(__file__).resolve().parent.parent))

from sqlalchemy import text
from sqlalchemy.ext.asyncio import create_async_engine

from app.core.config import get_settings


async def column_exists(conn, db_name: str, table: str, column: str) -> bool:
    """检查列是否存在"""
    result = await conn.execute(
        text(
            """
            SELECT COUNT(1)
            FROM INFORMATION_SCHEMA.COLUMNS
            WHERE TABLE_SCHEMA = :db
              AND TABLE_NAME = :table
              AND COLUMN_NAME = :column
            """
        ),
        {"db": db_name, "table": table, "column": column},
    )
    return (result.scalar() or 0) > 0


async def sync_users_table():
    """对 users 表进行列同步（仅添加缺失列）。"""
    settings = get_settings()

    # 解析数据库名
    db_url = settings.DATABASE_URL
    db_name = db_url.split("/")[-1].split("?")[0]

    engine = create_async_engine(settings.DATABASE_URL, echo=False)

    async with engine.begin() as conn:
        # 需要确保存在的列（列名 -> DDL 片段）
        required_columns = {
            "avatar_url": "ALTER TABLE `users` ADD COLUMN `avatar_url` VARCHAR(500) NULL COMMENT '头像URL'",
            "bio": "ALTER TABLE `users` ADD COLUMN `bio` TEXT NULL COMMENT '个人简介'",
            "role": "ALTER TABLE `users` ADD COLUMN `role` VARCHAR(20) NOT NULL DEFAULT 'trainee' COMMENT '系统角色'",
            "is_active": "ALTER TABLE `users` ADD COLUMN `is_active` BOOLEAN NOT NULL DEFAULT TRUE COMMENT '是否激活'",
            "is_verified": "ALTER TABLE `users` ADD COLUMN `is_verified` BOOLEAN NOT NULL DEFAULT FALSE COMMENT '是否验证'",
            "last_login_at": "ALTER TABLE `users` ADD COLUMN `last_login_at` DATETIME NULL COMMENT '最后登录时间'",
            "password_changed_at": "ALTER TABLE `users` ADD COLUMN `password_changed_at` DATETIME NULL COMMENT '密码修改时间'",
            "is_deleted": "ALTER TABLE `users` ADD COLUMN `is_deleted` BOOLEAN NOT NULL DEFAULT FALSE COMMENT '是否删除'",
            "deleted_at": "ALTER TABLE `users` ADD COLUMN `deleted_at` DATETIME NULL COMMENT '删除时间'",
        }

        applied = []
        for col, ddl in required_columns.items():
            exists = await column_exists(conn, db_name, "users", col)
            if not exists:
                await conn.execute(text(ddl))
                applied.append(col)

    await engine.dispose()
    return applied


async def main():
    try:
        applied = await sync_users_table()
        if applied:
            print("添加列:", ", ".join(applied))
        else:
            print("users 表结构已满足要求，无需变更。")
    except Exception as exc:
        # 输出完整错误，便于调试
        import traceback

        print("同步失败:", str(exc))
        traceback.print_exc()
        sys.exit(1)


if __name__ == "__main__":
    asyncio.run(main())