# -*- coding: utf-8 -*-
"""响应序列化与记录辅助（消除 router 间重复定义）。"""
import time
from typing import Any

from core.state import REQ_LOG

# 站点用户公开字段（与 Flask auth_system._user_public 的非 full 口径一致）
_PUBLIC_FIELDS = ('id', 'username', 'email', 'role', 'duration_seconds',
                  'created_at', 'last_login', 'ann_seen')


def format_credits(count: int) -> str:
    """次数文案（与 Flask auth_system.format_credits 逐字一致）。"""
    if count < 0:
        return '不限次数'
    if count <= 0:
        return '已用完'
    return f'{count} 次'


def user_public(row: dict[str, Any]) -> dict[str, Any]:
    """用户公开字段（未登录/缺失字段安全）。"""
    return {k: row.get(k) for k in _PUBLIC_FIELDS}


def record_req_log(action: str, ip: str, song: str) -> None:
    """用户解析/下载操作记录（写入共享 REQ_LOG，保留最近 2000 条）。"""
    REQ_LOG.append({
        'action': action,
        'ip': ip,
        'song': str(song or '')[:100],
        'time': time.strftime('%Y-%m-%d %H:%M:%S'),
    })
    if len(REQ_LOG) > 2000:
        del REQ_LOG[:len(REQ_LOG) - 2000]