#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
IMU传感器管理器
负责IMU传感器的连接、校准和头部姿态数据采集
"""
import threading
import time
from typing import Optional, Dict, Any
import logging
from collections import deque
from datetime import datetime
import asyncio
try:
    from .base_device import BaseDevice
    from .utils.config_manager import ConfigManager
except ImportError:
    from base_device import BaseDevice
    from utils.config_manager import ConfigManager

# 设置日志
logger = logging.getLogger(__name__)

class BleIMUDevice:
    """蓝牙IMU设备（WitMotion WT9011DCL-BT50），基于 device_model.py 官方接口"""
    def __init__(self, mac_address: str):
        self.mac_address = mac_address
        self.loop = None
        self.loop_thread = None
        self.running = False
        self._lock = threading.Lock()
        self.calibration_data = None
        self.head_pose_offset = {'rotation': 0, 'tilt': 0, 'pitch': 0}
        self.last_data = {
            'roll': 0.0,
            'pitch': 0.0,
            'yaw': 0.0,
            'temperature': 25.0,
        }
        self._connected = False
        self._device_model = None
        self._open_task = None
        try:
            from . import device_model as wit_device_model
        except Exception:
            import device_model as wit_device_model
        self._wit_device_model = wit_device_model

    def set_calibration(self, calibration: Dict[str, Any]):
        self.calibration_data = calibration
        if 'head_pose_offset' in calibration:
            self.head_pose_offset = calibration['head_pose_offset']

    def apply_calibration(self, raw_data: Dict[str, Any]) -> Dict[str, Any]:
        if not raw_data or 'head_pose' not in raw_data:
            return raw_data
        calibrated_data = raw_data.copy()
        head_pose = raw_data['head_pose'].copy()
        # 与串口IMU保持一致：对 rotation 做归一化到 [-180, 180)
        angle = head_pose['rotation'] - self.head_pose_offset['rotation']
        head_pose['rotation'] = round(((angle + 180) % 360) - 180,1)
        head_pose['tilt'] = round(head_pose['tilt'] - self.head_pose_offset['tilt'],1)
        head_pose['pitch'] = round(head_pose['pitch'] - self.head_pose_offset['pitch'],1)
        calibrated_data['head_pose'] = head_pose
        return calibrated_data

    def start(self):
        if self.running:
            return
        self.running = True
        self.loop_thread = threading.Thread(target=self._run_loop, daemon=True)
        self.loop_thread.start()

    def stop(self):
        self.running = False
        try:
            if self.loop:
                asyncio.run_coroutine_threadsafe(self._disconnect(), self.loop)
        except Exception:
            pass

    def read_data(self, apply_calibration: bool = True) -> Dict[str, Any]:
        with self._lock:
            raw = {
                'head_pose': {
                    'rotation': self.last_data['yaw'],   # rotation 对应航向角
                    'tilt': self.last_data['pitch'],      # tilt 对应横滚
                    'pitch': self.last_data['roll']     # pitch 对应俯仰
                },
                'temperature': self.last_data.get('temperature', 25.0),
                'timestamp': datetime.now().isoformat()
            }
        return self.apply_calibration(raw) if apply_calibration else raw

    def _run_loop(self):
        self.loop = asyncio.new_event_loop()
        asyncio.set_event_loop(self.loop)
        try:
            self.loop.run_until_complete(self._connect_and_listen())
        except asyncio.CancelledError:
            pass
        except Exception as e:
            logger.error(f'BLE IMU事件循环异常: {e}', exc_info=True)
        finally:
            try:
                if not self.loop.is_closed():
                    self.loop.stop()
                    self.loop.close()
            except Exception:
                pass

    def _on_device_update(self, dm):
        try:
            roll = dm.get("AngX")
            pitch = dm.get("AngY")
            yaw = dm.get("AngZ")
            if roll is None or pitch is None or yaw is None:
                return
            with self._lock:
                self.last_data['roll'] = float(roll)
                self.last_data['pitch'] = float(pitch)
                self.last_data['yaw'] = float(yaw)
        except Exception:
            pass

    async def _disconnect(self):
        try:
            if self._device_model is not None:
                try:
                    self._device_model.closeDevice()
                except Exception:
                    pass
            if self._open_task is not None and not self._open_task.done():
                self._open_task.cancel()
                try:
                    await self._open_task
                except asyncio.CancelledError:
                    pass
                except Exception:
                    pass
        finally:
            self._open_task = None
            self._device_model = None

    async def _connect_and_listen(self):
        try:
            from bleak import BleakScanner
        except Exception as e:
            logger.error(f"未安装bleak或导入失败: {e}")
            self.running = False
            return

        while self.running:
            try:
                try:
                    device = await BleakScanner.find_device_by_address(self.mac_address, timeout=20.0)
                except TypeError:
                    device = await BleakScanner.find_device_by_address(self.mac_address, cb=dict(use_bdaddr=False))

                if device is None:
                    await asyncio.sleep(2.0)
                    continue

                self._device_model = self._wit_device_model.DeviceModel("WitMotionBle5.0", device, self._on_device_update)
                self._open_task = asyncio.create_task(self._device_model.openDevice())

                connected = False
                for _ in range(50):
                    if not self.running:
                        break
                    if self._open_task.done():
                        break
                    client = getattr(self._device_model, "client", None)
                    if client is not None and getattr(client, "is_connected", False):
                        connected = True
                        break
                    await asyncio.sleep(0.2)

                self._connected = connected
                if not connected:
                    await self._disconnect()
                    self._connected = False
                    await asyncio.sleep(2.0)
                    continue

                while self.running and self._open_task is not None and not self._open_task.done():
                    await asyncio.sleep(1.0)

                await self._disconnect()
                self._connected = False

            except asyncio.CancelledError:
                break
            except Exception as e:
                logger.error(f"BLE IMU连接/监听失败: {e}", exc_info=True)
                self._connected = False
                await asyncio.sleep(2.0)

    @property
    def connected(self) -> bool:
        return self._connected
 
class MockIMUDevice:
    def __init__(self):
        self.running = False
        self.thread = None
        self._lock = threading.Lock()
        self._connected = False
        self.calibration_data = None
        self.head_pose_offset = {'rotation': 0, 'tilt': 0, 'pitch': 0}
        self.last_data = {
            'roll': 0.0,
            'pitch': 0.0,
            'yaw': 0.0,
            'temperature': 25.0
        }
        self._phase = 0.0

    def set_calibration(self, calibration: Dict[str, Any]):
        self.calibration_data = calibration
        if 'head_pose_offset' in calibration:
            self.head_pose_offset = calibration['head_pose_offset']

    def apply_calibration(self, raw_data: Dict[str, Any]) -> Dict[str, Any]:
        if not raw_data or 'head_pose' not in raw_data:
            return raw_data
        calibrated_data = raw_data.copy()
        head_pose = raw_data['head_pose'].copy()
        angle = head_pose['rotation'] - self.head_pose_offset['rotation']
        head_pose['rotation'] = round(((angle + 180) % 360) - 180, 1)
        head_pose['tilt'] = round(head_pose['tilt'] - self.head_pose_offset['tilt'], 1)
        head_pose['pitch'] = round(head_pose['pitch'] - self.head_pose_offset['pitch'], 1)
        calibrated_data['head_pose'] = head_pose
        return calibrated_data

    def start(self):
        if self.running:
            return
        self.running = True
        self._connected = True
        self.thread = threading.Thread(target=self._run_loop, daemon=True)
        self.thread.start()

    def stop(self):
        self.running = False
        try:
            if self.thread and self.thread.is_alive():
                self.thread.join(timeout=2.0)
        except Exception:
            pass
        self._connected = False

    def read_data(self, apply_calibration: bool = True) -> Dict[str, Any]:
        with self._lock:
            raw = {
                'head_pose': {
                    'rotation': self.last_data['yaw'],
                    'tilt': self.last_data['pitch'],
                    'pitch': self.last_data['roll']
                },
                'temperature': self.last_data.get('temperature', 25.0),
                'timestamp': datetime.now().isoformat()
            }
        return self.apply_calibration(raw) if apply_calibration else raw

    def _run_loop(self):
        # 模拟IMU设备的后台数据生成线程（约60Hz），输出平滑变化的姿态与温度
        import math
        try:
            while self.running:
                # 相位累加，用于驱动正弦/余弦波形
                self._phase += 0.05
                # 航向角（yaw，左右旋转），幅度约±30°
                yaw = math.sin(self._phase * 0.6) * 30.0
                # yaw = 0
                # 俯仰角（pitch，上下点头），幅度约±10°
                pitch = math.sin(self._phase) * 5.0
                # pitch = 0
                # 横滚角（roll，左右侧倾），幅度约±8°
                roll = math.cos(self._phase * 0.8) * 5.0
                # roll = 0
                # 写入最新数据，使用1位或2位小数以模拟设备精度
                with self._lock:
                    self.last_data['yaw'] = round(yaw, 1)
                    self.last_data['pitch'] = round(pitch, 1)
                    self.last_data['roll'] = round(roll, 1)
                    # 温度模拟：以25℃为基准，叠加±0.5℃的轻微波动
                    self.last_data['temperature'] = round(25.0 + math.sin(self._phase * 0.2) * 0.5, 2)
                # 控制输出频率为约60Hz
                time.sleep(1.0 / 30.0)
        except Exception:
            # 忽略模拟线程异常，避免影响主流程
            pass

    @property
    def connected(self) -> bool:
        return self._connected

class IMUManager(BaseDevice):
    """IMU传感器管理器"""
    
    def __init__(self, socketio, config_manager: Optional[ConfigManager] = None):
        """
        初始化IMU管理器
        
        Args:
            socketio: SocketIO实例
            config_manager: 配置管理器实例
        """
        # 配置管理
        self.config_manager = config_manager or ConfigManager()
        config = self.config_manager.get_device_config('imu')
        
        super().__init__("imu", config)
        
        # 保存socketio实例
        self._socketio = socketio
        
        # 设备配置
        self.use_mock = bool(config.get('use_mock', False))
        self.mac_address = config.get('mac_address', '')
        # IMU设备实例
        self.imu_device = None
        
        # 推流相关
        self.imu_streaming = False
        self.imu_thread = None
        
        # 统计信息
        self.data_count = 0
        self.error_count = 0
        
        # 校准相关
        self.is_calibrated = False
        self.head_pose_offset = {'rotation': 0, 'tilt': 0, 'pitch': 0}
        
        # 数据缓存
        self.data_buffer = deque(maxlen=100)
        self.last_valid_data = None
        
        self.logger.info(f"IMU管理器初始化完成 - use_mock: {self.use_mock}, MAC: {self.mac_address}")
        
    def initialize(self) -> bool:
        """
        初始化IMU设备
        
        Returns:
            bool: 初始化是否成功
        """
        try:
            self.logger.info(f"正在初始化IMU设备...")
            
            # 使用构造函数中已加载的配置，避免并发读取配置文件
            self.logger.info(f"使用已加载配置: use_mock={self.use_mock}, mac={self.mac_address}")
            
            # 根据配置选择设备类型
            if not self.use_mock:
                if not self.mac_address:
                    self.logger.error("IMU BLE设备未配置MAC地址")
                    self.is_connected = False
                    return False
                self.logger.info(f"使用蓝牙IMU设备 - MAC: {self.mac_address}")
                self.imu_device = BleIMUDevice(self.mac_address)
                self.imu_device.start()
                # 使用set_connected方法来正确启动连接监控线程
                self.set_connected(True)            
            else:
                self.logger.info("使用模拟IMU设备")
                self.imu_device = MockIMUDevice()
                self.imu_device.start()
                # 使用set_connected方法来正确启动连接监控线程
                self.set_connected(True)
                
            self._device_info.update({
                'mac_address': self.mac_address,
            })
            
            self.logger.info("IMU初始化成功")
            return True
            
        except Exception as e:
            self.logger.error(f"IMU初始化失败: {e}")
            self.is_connected = False
            self.imu_device = None
            return False
            
    def _quick_calibrate_imu(self) -> Dict[str, Any]:
        """
        快速IMU零点校准（以当前姿态为基准）
        
        Returns:
            Dict[str, Any]: 校准结果
        """
        try:
            if not self.imu_device:
                return {'status': 'error', 'error': 'IMU设备未初始化'}
                
            self.logger.info('开始IMU快速零点校准...')
            
            # 直接读取一次原始数据作为校准偏移量
            raw_data = self.imu_device.read_data(apply_calibration=False)
            if not raw_data or 'head_pose' not in raw_data:
                return {'status': 'error', 'error': '无法读取IMU原始数据'}
            
            # 使用当前姿态作为零点偏移
            self.head_pose_offset = {
                'rotation': raw_data['head_pose']['rotation'],
                'tilt': raw_data['head_pose']['tilt'],
                'pitch': raw_data['head_pose']['pitch']
            }
            
            # 应用校准到设备
            calibration_data = {'head_pose_offset': self.head_pose_offset}
            self.imu_device.set_calibration(calibration_data)
            
            self.logger.info(f'IMU快速校准完成: {self.head_pose_offset}')
            return {
                'status': 'success',
                'head_pose_offset': self.head_pose_offset
            }
            
        except Exception as e:
            self.logger.error(f'IMU快速校准失败: {e}')
            return {'status': 'error', 'error': str(e)}
            
    def calibrate(self) -> bool:
        """
        校准IMU传感器
        
        Returns:
            bool: 校准是否成功
        """
        try:
            if not self.is_connected or not self.imu_device:
                if not self.initialize():
                    self.logger.error("IMU设备未连接")
                    return False
                
            # 使用快速校准方法
            result = self._quick_calibrate_imu()
            
            if result['status'] == 'success':
                self.is_calibrated = True
                self.logger.info("IMU校准成功")
                return True
            else:
                self.logger.error(f"IMU校准失败: {result.get('error', '未知错误')}")
                return False
                
        except Exception as e:
            self.logger.error(f"IMU校准失败: {e}")
            return False
            

        
    def start_streaming(self) -> bool:
        """
        开始IMU数据流
        
        Args:
            socketio: SocketIO实例，用于数据推送
            
        Returns:
            bool: 启动是否成功
        """
        try:
            if not self.is_connected or not self.imu_device:
                if not self.initialize():
                    return False
                    
            if self.imu_streaming:
                self.logger.warning("IMU数据流已在运行")
                return True
                
            # 启动前进行快速校准
            if not self.is_calibrated:
                self.logger.info("启动前进行快速零点校准...")
                self._quick_calibrate_imu()                

            self.imu_streaming = True
            self.imu_thread = threading.Thread(target=self._imu_streaming_thread, daemon=True)
            self.imu_thread.start()
            
            self.logger.info("IMU数据流启动成功")
            return True
            
        except Exception as e:
            self.logger.error(f"IMU数据流启动失败: {e}")
            self.imu_streaming = False
            return False
            
    def stop_streaming(self) -> bool:
        """
        停止IMU数据流
        
        Returns:
            bool: 停止是否成功
        """
        try:
            self.imu_streaming = False
            
            if self.imu_thread and self.imu_thread.is_alive():
                self.imu_thread.join(timeout=3.0)
                
            # 停止BLE后台任务（如果是BLE设备）
            try:
                if isinstance(self.imu_device, BleIMUDevice):
                    self.imu_device.stop()
            except Exception:
                pass
                
            self.logger.info("IMU数据流已停止")
            return True
            
        except Exception as e:
            self.logger.error(f"停止IMU数据流失败: {e}")
            return False
            
    def _imu_streaming_thread(self):
        """
        IMU数据流工作线程
        """
        self.logger.info("IMU数据流工作线程启动")
        
        while self.imu_streaming:
            try:
                if self.imu_device:
                    # 读取IMU数据
                    data = self.imu_device.read_data(apply_calibration=True)
                    
                    if data:
                        # 发送数据到前端
                        if self._socketio:
                            self._socketio.emit('imu_data', data, namespace='/devices')
                        
                        # 更新统计
                        self.data_count += 1
                    else:
                        self.error_count += 1
                        
                time.sleep(0.02)  # 50Hz采样率
                    
            except Exception as e:
                self.logger.error(f"IMU数据流处理异常: {e}")
                self.error_count += 1
                time.sleep(0.1)
                
        self.logger.info("IMU数据流工作线程结束")
        

            
    def get_status(self) -> Dict[str, Any]:
        """
        获取设备状态
        
        Returns:
            Dict[str, Any]: 设备状态信息
        """
        status = super().get_status()
        status.update({
            'is_streaming': self.imu_streaming,
            'is_calibrated': self.is_calibrated,
            'data_count': self.data_count,
            'error_count': self.error_count,
            'buffer_size': len(self.data_buffer),
            'has_data': self.last_valid_data is not None,
            'head_pose_offset': self.head_pose_offset,
            'device_type': 'mock' if self.use_mock else 'ble',
            'mac_address': self.mac_address
        })
        return status
        
    def get_latest_data(self) -> Optional[Dict[str, float]]:
        """
        获取最新的IMU数据
        
        Returns:
            Optional[Dict[str, float]]: 最新数据，无数据返回None
        """
        return self.last_valid_data.copy() if self.last_valid_data else None
        
    
        
    def disconnect(self):
        """
        断开IMU设备连接
        """
        try:
            self.stop_streaming()
            
            if self.imu_device:
                self.imu_device = None
                
            self.is_connected = False
            self.logger.info("IMU设备已断开连接")
            
        except Exception as e:
            self.logger.error(f"断开IMU设备连接失败: {e}")
            
    def reload_config(self) -> bool:
        """
        重新加载设备配置
        
        Returns:
            bool: 重新加载是否成功
        """
        try:
            self.logger.info("正在重新加载IMU配置...")
            
 
            
            # 获取最新配置
            config = self.config_manager.get_device_config('imu')
            
            # 更新配置属性
            self.use_mock = bool(config.get('use_mock', False))
            self.mac_address = config.get('mac_address', '')
            
            # 更新数据缓存队列大小
            buffer_size = config.get('buffer_size', 100)
            if buffer_size != self.data_buffer.maxlen:
                # 保存当前数据
                current_data = list(self.data_buffer)
                # 创建新缓冲区
                self.data_buffer = deque(maxlen=buffer_size)
                # 恢复数据（保留最新的数据）
                for data in current_data[-buffer_size:]:
                    self.data_buffer.append(data)
            
            self.logger.info(f"IMU配置重新加载成功 - use_mock: {self.use_mock}, MAC: {self.mac_address}")
            return True
            
        except Exception as e:
            self.logger.error(f"重新加载IMU配置失败: {e}")
            return False
    
    def check_hardware_connection(self) -> bool:
        """
        检查IMU硬件连接状态
        """
        try:
            if not self.imu_device:
                return False
            
            if hasattr(self.imu_device, 'connected'):
                return bool(getattr(self.imu_device, 'connected'))

            if hasattr(self.imu_device, 'ser') and getattr(self.imu_device, 'ser', None):
                if not self.imu_device.ser.is_open:
                    return False
                try:
                    original_timeout = self.imu_device.ser.timeout
                    self.imu_device.ser.timeout = 0.1
                    self.imu_device.ser.read(1)
                    self.imu_device.ser.timeout = original_timeout
                    return True
                except Exception:
                    return False

            return True
            
        except Exception as e:
            self.logger.debug(f"检查IMU硬件连接时出错: {e}")
            return False
    
    def cleanup(self):
        """
        清理资源
        """
        try:
            # 停止连接监控
            self._cleanup_monitoring()
            
            self.disconnect()
            
            # 清理缓冲区
            self.data_buffer.clear()
            
            # 重置状态
            self.is_calibrated = False
            self.last_valid_data = None
            self.head_pose_offset = {'rotation': 0, 'tilt': 0, 'pitch': 0}
            
            super().cleanup()
            self.logger.info("IMU资源清理完成")
            
        except Exception as e:
            self.logger.error(f"清理IMU资源失败: {e}")