"""
Redis 残留任务清理。合并了原来散落在 app.py 中 3 处的清理逻辑。
"""
import time
import subprocess
import platform
from foundation.observability.logger.loggering import server_logger


def cleanup_redis_tasks(redis_client, phase: str = "启动前"):
    """清理 Redis 中的 Celery 残留任务。

    Args:
        redis_client: Redis 连接对象
        phase: "启动前" | "停止时" — 控制是否杀死现有 worker
    """
    try:
        server_logger.info(f"{phase}清理Redis中的Celery任务...")

        if phase == "启动前":
            _kill_existing_celery_workers()

        patterns = [
            'task:*', 'celery-task-meta-*', 'current:*', '_kombu.binding.*',
            'unacked*', 'celery@*', 'celery~*',
        ]
        all_keys = []
        for pattern in patterns:
            all_keys.extend(redis_client.keys(pattern))

        for key in all_keys:
            try:
                redis_client.delete(key)
            except Exception as e:
                server_logger.warning(f"{phase}清理 {key} 失败: {e}")

        for queue in ['celery', 'celery.pidbox', 'celeryev']:
            try:
                redis_client.delete(queue)
            except Exception as e:
                server_logger.warning(f"{phase}清理队列 {queue} 失败: {e}")

        for queue in ['celery']:
            queue_len = redis_client.llen(queue)
            if queue_len > 0:
                server_logger.warning(f"队列 {queue} 仍有 {queue_len} 个任务，强制清空")
                redis_client.delete(queue)

        if all_keys:
            server_logger.info(f"{phase}已清理 {len(all_keys)} 个Redis键")
        else:
            server_logger.info(f"{phase}未发现需要清理的残留任务")

        if phase == "启动前":
            time.sleep(0.5)

    except Exception as e:
        server_logger.error(f"{phase}清理Redis任务失败: {e}")


def _kill_existing_celery_workers():
    """终止所有现有的 Celery Worker 进程。"""
    system = platform.system()
    try:
        if system == "Windows":
            # PowerShell Get-CimInstance 查找命令行包含 celery 的 python 进程并终止
            result = subprocess.run(
                ['powershell', '-NoProfile', '-Command',
                 'Get-CimInstance Win32_Process -Filter "name=\'python.exe\'" | Where-Object {$_.CommandLine -like \'*celery*\'} | Select-Object -ExpandProperty ProcessId'],
                capture_output=True, text=True, timeout=15,
            )
            for line in result.stdout.strip().split('\n'):
                pid = line.strip()
                if pid and pid.isdigit():
                    subprocess.run(['taskkill', '/F', '/PID', pid],
                                   capture_output=True, timeout=5)
                    server_logger.info(f"已终止Celery Worker进程 PID={pid}")
        else:
            subprocess.run(['pkill', '-f', 'celery worker'], capture_output=True)
            server_logger.info("已终止现有的Celery Worker进程")
        time.sleep(0.5)
    except Exception as e:
        server_logger.warning(f"终止现有Celery Worker失败: {e}")