import ctypes
import threading
import time
from typing import Dict, Tuple, List

from Utils.LogManager import LogManager


def _async_raise(tid: int, exc_type=KeyboardInterrupt) -> bool:
    """向指定线程抛异常（兜底方案）"""
    try:
        res = ctypes.pythonapi.PyThreadState_SetAsyncExc(
            ctypes.c_long(tid), ctypes.py_object(exc_type)
        )
        if res == 0:
            LogManager.method_info(f"线程 {tid} 不存在", "task")
            return False
        elif res > 1:
            ctypes.pythonapi.PyThreadState_SetAsyncExc(ctypes.c_long(tid), 0)
            LogManager.method_info(f"线程 {tid} 命中多个线程，已回滚", "task")
            return False
        return True
    except Exception as e:
        LogManager.method_error(f"强杀线程失败: {e}", "task")
        return False


class ThreadManager:
    _tasks: Dict[str, Dict] = {}
    _lock = threading.RLock()

    @classmethod
    def _cleanup_if_dead(cls, udid: str):
        """如果任务线程已结束，清理占位"""
        obj = cls._tasks.get(udid)
        if obj and not obj["thread"].is_alive():
            cls._tasks.pop(udid, None)
            LogManager.method_info(f"检测到 [{udid}] 线程已结束，自动清理。", "task")

    @classmethod
    def add(cls, udid: str, thread: threading.Thread, event: threading.Event, force: bool = False) -> Tuple[int, str]:
        with cls._lock:
            cls._cleanup_if_dead(udid)

            # 已存在任务还在运行
            old = cls._tasks.get(udid)
            if old and old["thread"].is_alive():
                if not force:
                    return 1001, "当前设备已存在任务"
                LogManager.method_info(f"[{udid}] 检测到旧任务，尝试强制停止", "task")
                cls._force_stop_locked(udid)

            # 启动新任务
            try:
                thread.start()
                cls._tasks[udid] = {
                    "id": thread.ident,
                    "thread": thread,
                    "event": event,
                    "start_time": time.time(),
                }
                LogManager.method_info(f"创建任务成功 [{udid}]，线程ID={thread.ident}", "task")
                return 200, "创建成功"
            except Exception as e:
                LogManager.method_error(f"线程启动失败: {e}", "task")
                return 1002, f"线程启动失败: {e}"

    @classmethod
    def stop(cls, udid: str, stop_timeout: float = 5.0, kill_timeout: float = 2.0) -> Tuple[int, str]:
        """安全停止单个任务"""
        with cls._lock:
            obj = cls._tasks.get(udid)
            if not obj:
                return 200, "任务不存在"

            thread = obj["thread"]
            event = obj["event"]
            tid = obj["id"]

            LogManager.method_info(f"请求停止 [{udid}] 线程ID={tid}", "task")

            # 已经结束
            if not thread.is_alive():
                cls._tasks.pop(udid, None)
                return 200, "已结束"

            # 1. 协作式停止
            try:
                event.set()
            except Exception as e:
                LogManager.method_error(f"[{udid}] 设置停止事件失败: {e}", "task")

            thread.join(timeout=stop_timeout)
            if not thread.is_alive():
                cls._tasks.pop(udid, None)
                LogManager.method_info(f"[{udid}] 协作式停止成功", "task")
                return 200, "已停止"

            # 2. 强杀兜底
            LogManager.method_info(f"[{udid}] 协作式超时，尝试强杀", "task")
            if _async_raise(tid):
                thread.join(timeout=kill_timeout)

            if not thread.is_alive():
                cls._tasks.pop(udid, None)
                LogManager.method_info(f"[{udid}] 强杀成功", "task")
                return 200, "已停止"

            # 3. 最终兜底：标记释放占位
            LogManager.method_error(f"[{udid}] 无法停止（线程可能卡死），已释放占位", "task")
            cls._tasks.pop(udid, None)
            return 206, "停止超时，线程可能仍在后台运行"

    @classmethod
    def _force_stop_locked(cls, udid: str):
        """内部用，带锁强制停止旧任务"""
        obj = cls._tasks.get(udid)
        if not obj:
            return
        try:
            event = obj["event"]
            event.set()
            obj["thread"].join(timeout=2)
            if obj["thread"].is_alive():
                _async_raise(obj["id"])
                obj["thread"].join(timeout=1)
        except Exception as e:
            LogManager.method_error(f"[{udid}] 强制停止失败: {e}", "task")
        finally:
            cls._tasks.pop(udid, None)

    @classmethod
    def batch_stop(cls, ids: List[str]) -> Tuple[int, str]:
        failed = []
        for udid in ids:
            code, msg = cls.stop(udid)
            if code != 200:
                failed.append(udid)
        if failed:
            return 207, f"部分任务未成功停止: {failed}"
        return 200, "全部停止成功"