#!/usr/bin/env python3
# -*- coding: utf-8 -*-
from __future__ import annotations

import threading
import time

from app_config import get_config
from app_logger import get_logger
from services.state import (
    cleanup_expired_ip_rate_limits,
    safe_cleanup_expired_batches,
    safe_cleanup_expired_captcha,
    safe_cleanup_expired_pending_random,
    safe_get_user_accounts_last_access_items,
    safe_has_user,
    safe_iter_task_status_items,
    safe_remove_task_status,
    safe_remove_user_accounts,
)

logger = get_logger("app")
config = get_config()

USER_ACCOUNTS_EXPIRE_SECONDS = int(getattr(config, "USER_ACCOUNTS_EXPIRE_SECONDS", 3600))
BATCH_TASK_EXPIRE_SECONDS = int(getattr(config, "BATCH_TASK_EXPIRE_SECONDS", 21600))
PENDING_RANDOM_EXPIRE_SECONDS = int(getattr(config, "PENDING_RANDOM_EXPIRE_SECONDS", 7200))


def cleanup_expired_data() -> None:
    """定期清理过期数据，防止内存泄漏（逻辑保持不变）。"""
    current_time = time.time()

    deleted_captchas = safe_cleanup_expired_captcha(current_time)
    if deleted_captchas:
        logger.debug(f"已清理 {deleted_captchas} 个过期验证码")

    deleted_ips = cleanup_expired_ip_rate_limits(current_time)
    if deleted_ips:
        logger.debug(f"已清理 {deleted_ips} 个过期IP限流记录")

    expired_users = []
    last_access_items = safe_get_user_accounts_last_access_items()
    if last_access_items:
        task_items = safe_iter_task_status_items()
        active_user_ids = {int(info.get("user_id")) for _, info in task_items if info.get("user_id")}
        for user_id, last_access in last_access_items:
            if (current_time - float(last_access)) <= USER_ACCOUNTS_EXPIRE_SECONDS:
                continue
            if int(user_id) in active_user_ids:
                continue
            if safe_has_user(user_id):
                expired_users.append(int(user_id))

    for user_id in expired_users:
        safe_remove_user_accounts(user_id)
    if expired_users:
        logger.debug(f"已清理 {len(expired_users)} 个过期用户账号缓存")

    completed_tasks = []
    for account_id, status_data in safe_iter_task_status_items():
        if status_data.get("status") in ["已完成", "失败", "已停止"]:
            start_time = float(status_data.get("start_time", 0) or 0)
            if (current_time - start_time) > 600:  # 10分钟
                completed_tasks.append(account_id)
    for account_id in completed_tasks:
        safe_remove_task_status(account_id)
    if completed_tasks:
        logger.debug(f"已清理 {len(completed_tasks)} 个已完成任务状态")

    try:
        import os

        while True:
            try:
                pid, status = os.waitpid(-1, os.WNOHANG)
                if pid == 0:
                    break
                logger.debug(f"已回收僵尸进程: PID={pid}")
            except ChildProcessError:
                break
    except Exception:
        pass

    deleted_batches = safe_cleanup_expired_batches(BATCH_TASK_EXPIRE_SECONDS, current_time)
    if deleted_batches:
        logger.debug(f"已清理 {deleted_batches} 个过期批次任务缓存")

    deleted_random = safe_cleanup_expired_pending_random(PENDING_RANDOM_EXPIRE_SECONDS, current_time)
    if deleted_random:
        logger.debug(f"已清理 {deleted_random} 个过期随机延迟任务")


def start_cleanup_scheduler() -> None:
    """启动定期清理调度器"""

    def cleanup_loop():
        while True:
            try:
                time.sleep(300)  # 每5分钟执行一次清理
                cleanup_expired_data()
            except Exception as e:
                logger.error(f"清理任务执行失败: {e}")

    cleanup_thread = threading.Thread(target=cleanup_loop, daemon=True, name="cleanup-scheduler")
    cleanup_thread.start()
    logger.info("内存清理调度器已启动")