from fastapi import HTTPException
from ..db import get_connection
from ..utils.jwt_handler import verify_token

def _verify_admin_permission(token: str):
    """公共权限验证方法"""
    try:
        payload = verify_token(token)
        username = payload["sub"]
    except ValueError as e:
        raise HTTPException(status_code=401, detail=str(e))

    connection = get_connection()
    try:
        cursor = connection.cursor(dictionary=True)
        cursor.execute("SELECT user_type FROM users WHERE username = %s;", (username,))
        admin_user = cursor.fetchone()

        if not admin_user or admin_user["user_type"] != "admin":
            raise HTTPException(status_code=403, detail="Permission denied")
        return username
    finally:
        cursor.close()
        connection.close()

def list_groups_service(token: str) -> list:
    """获取所有游戏群组服务"""
    _verify_admin_permission(token)
    connection = get_connection()
    cursor = connection.cursor(dictionary=True)
    try:
        cursor.execute("""
            SELECT gg.*, u.username AS leader_name 
            FROM game_groups gg
            LEFT JOIN users u ON gg.user_id = u.user_id
        """)
        return cursor.fetchall()
    finally:
        cursor.close()
        connection.close()

def delete_group_service(token: str, group_id: int) -> dict:
    """删除群组服务"""
    _verify_admin_permission(token)
    connection = get_connection()
    cursor = connection.cursor()
    try:
        # 先删除关联的成员
        cursor.execute("DELETE FROM group_members WHERE group_id = %s", (group_id,))
        # 再删除群组
        cursor.execute("DELETE FROM game_groups WHERE group_id = %s", (group_id,))
        connection.commit()
        return {"message": "删除成功"}
    except Exception as e:
        connection.rollback()
        raise HTTPException(500, str(e))
    finally:
        cursor.close()
        connection.close()