import sys
import os
import logging
import json
import ctypes
from ctypes import *

# 添加相机模块路径
sys.path.append(os.path.join(os.path.dirname(os.path.dirname(__file__)), "camera"))

# 导入相机相关模块
from camera.MvCameraControl_class import MvCamera
from camera.CamOperation_class import CameraOperation
from camera.MvErrorDefine_const import *
from camera.CameraParams_header import *
from camera.CameraParams_const import *


class CameraManager:
    """相机管理器单例类，确保整个应用中只有一个相机实例"""
    
    _instance = None
    _initialized = False
    
    @staticmethod
    def get_instance():
        """获取相机管理器实例"""
        if CameraManager._instance is None:
            CameraManager._instance = CameraManager()
        return CameraManager._instance
    
    def __init__(self):
        """初始化相机管理器"""
        if CameraManager._instance is not None:
            raise Exception("相机管理器是单例类，请使用get_instance()方法获取实例")
        else:
            CameraManager._instance = self
            
            # 初始化变量
            self.deviceList = None
            self.cam = MvCamera()
            self.nSelCamIndex = -1
            self.obj_cam_operation = None
            self.isOpen = False
            self.isGrabbing = False
            
            # 初始化SDK (只在第一次时初始化)
            if not CameraManager._initialized:
                MvCamera.MV_CC_Initialize()
                CameraManager._initialized = True
                logging.info("相机SDK已初始化")
    
    def enum_devices(self):
        """枚举相机设备，完全参考BasicDemo.py的enum_devices实现"""
        try:
            # 确保Hikvision SDK已正确加载
            from camera.MvCameraControl_class import MvCamCtrldll
            if MvCamCtrldll is None:
                logging.error("相机SDK未正确加载，无法枚举设备")
                return []
                
            # 确保先关闭任何已打开的相机
            if self.isOpen:
                self.close_device()
            
            # 枚举设备
            self.deviceList = MV_CC_DEVICE_INFO_LIST()
            n_layer_type = (MV_GIGE_DEVICE | MV_USB_DEVICE | MV_GENTL_CAMERALINK_DEVICE
                        | MV_GENTL_CXP_DEVICE | MV_GENTL_XOF_DEVICE)
            ret = MvCamera.MV_CC_EnumDevices(n_layer_type, self.deviceList)
            if ret != 0:
                error_msg = f"枚举设备失败! 错误码: 0x{ret:x}"
                logging.error(error_msg)
                return None
            
            if self.deviceList.nDeviceNum == 0:
                logging.info("未找到相机设备")
                return []
            
            logging.info(f"找到 {self.deviceList.nDeviceNum} 个相机设备")
            
            # 定义解码函数
            def decoding_char(c_ubyte_value):
                c_char_p_value = ctypes.cast(c_ubyte_value, ctypes.c_char_p)
                try:
                    decode_str = c_char_p_value.value.decode('gbk')  # 中文字符
                except UnicodeDecodeError:
                    decode_str = str(c_char_p_value.value)
                return decode_str
            
            # 构造设备信息列表
            devices_info = []
            for i in range(0, self.deviceList.nDeviceNum):
                mvcc_dev_info = cast(self.deviceList.pDeviceInfo[i], POINTER(MV_CC_DEVICE_INFO)).contents
                
                # 详细日志
                logging.debug(f"设备 {i} 类型: {mvcc_dev_info.nTLayerType}")
                
                if mvcc_dev_info.nTLayerType == MV_GIGE_DEVICE:
                    # GigE相机
                    user_defined_name = decoding_char(mvcc_dev_info.SpecialInfo.stGigEInfo.chUserDefinedName)
                    model_name = decoding_char(mvcc_dev_info.SpecialInfo.stGigEInfo.chModelName)
                    
                    nip1 = ((mvcc_dev_info.SpecialInfo.stGigEInfo.nCurrentIp & 0xff000000) >> 24)
                    nip2 = ((mvcc_dev_info.SpecialInfo.stGigEInfo.nCurrentIp & 0x00ff0000) >> 16)
                    nip3 = ((mvcc_dev_info.SpecialInfo.stGigEInfo.nCurrentIp & 0x0000ff00) >> 8)
                    nip4 = (mvcc_dev_info.SpecialInfo.stGigEInfo.nCurrentIp & 0x000000ff)
                    ip = f"{nip1}.{nip2}.{nip3}.{nip4}"
                    
                    display = f"[{i}]GigE: {user_defined_name} {model_name} ({ip})"
                    logging.debug(f"GigE相机: {display}")
                    
                    device_info = {
                        "index": i,
                        "type": "GigE",
                        "name": user_defined_name,
                        "model": model_name,
                        "ip": ip,
                        "display": display
                    }
                    devices_info.append(device_info)
                    
                elif mvcc_dev_info.nTLayerType == MV_USB_DEVICE:
                    # USB相机
                    user_defined_name = decoding_char(mvcc_dev_info.SpecialInfo.stUsb3VInfo.chUserDefinedName)
                    model_name = decoding_char(mvcc_dev_info.SpecialInfo.stUsb3VInfo.chModelName)
                    
                    # 序列号
                    strSerialNumber = ""
                    for per in mvcc_dev_info.SpecialInfo.stUsb3VInfo.chSerialNumber:
                        if per == 0:
                            break
                        strSerialNumber = strSerialNumber + chr(per)
                    
                    display = f"[{i}]USB: {user_defined_name} {model_name} ({strSerialNumber})"
                    logging.debug(f"USB相机: {display}")
                    
                    device_info = {
                        "index": i,
                        "type": "USB",
                        "name": user_defined_name,
                        "model": model_name,
                        "serial": strSerialNumber,
                        "display": display
                    }
                    devices_info.append(device_info)
                    
                elif mvcc_dev_info.nTLayerType == MV_GENTL_CAMERALINK_DEVICE:
                    # CameraLink相机
                    user_defined_name = decoding_char(mvcc_dev_info.SpecialInfo.stCMLInfo.chUserDefinedName)
                    model_name = decoding_char(mvcc_dev_info.SpecialInfo.stCMLInfo.chModelName)
                    
                    strSerialNumber = ""
                    for per in mvcc_dev_info.SpecialInfo.stCMLInfo.chSerialNumber:
                        if per == 0:
                            break
                        strSerialNumber = strSerialNumber + chr(per)
                    
                    display = f"[{i}]CML: {user_defined_name} {model_name} ({strSerialNumber})"
                    logging.debug(f"CML相机: {display}")
                    
                    device_info = {
                        "index": i,
                        "type": "CML",
                        "name": user_defined_name,
                        "model": model_name,
                        "serial": strSerialNumber,
                        "display": display
                    }
                    devices_info.append(device_info)
                
                else:
                    # 其他类型相机
                    display = f"[{i}]Other"
                    device_info = {
                        "index": i,
                        "type": "Other",
                        "display": display
                    }
                    devices_info.append(device_info)
                    logging.debug(f"其他类型相机: {display}")
            
            # 添加详细日志
            logging.debug(f"枚举到的设备数量: {len(devices_info)}")
            return devices_info
            
        except Exception as e:
            error_msg = f"枚举设备时发生异常: {str(e)}"
            logging.error(error_msg)
            return None
    
    def open_device(self, device_index):
        """打开相机设备，参考BasicDemo.py的open_device实现
        
        Args:
            device_index: 设备索引
            
        Returns:
            bool: 是否成功打开设备
        """
        # 检查是否已经打开
        if self.isOpen:
            logging.warning("相机已经打开!")
            return False
        
        # 确保有效的设备索引
        if device_index < 0 or self.deviceList is None or device_index >= self.deviceList.nDeviceNum:
            error_msg = f"无效的设备索引: {device_index}, 设备列表: {self.deviceList is not None}"
            if self.deviceList:
                error_msg += f", 设备数量: {self.deviceList.nDeviceNum}"
            logging.error(error_msg)
            return False
        
        try:
            logging.info(f"开始打开相机，设备索引: {device_index}")
            
            # 设置当前选中的相机索引
            self.nSelCamIndex = device_index
            
            # 创建相机操作对象
            self.obj_cam_operation = CameraOperation(self.cam, self.deviceList, self.nSelCamIndex)
            ret = self.obj_cam_operation.Open_device()
            if ret != 0:
                error_msg = f"打开相机失败! 错误码: 0x{ret:x}"
                logging.error(error_msg)
                self.isOpen = False
                return False
            
            # 设置连续模式 (非触发模式)
            ret = self.obj_cam_operation.Set_trigger_mode(False)
            if ret != 0:
                error_msg = f"设置连续模式失败! 错误码: 0x{ret:x}"
                logging.error(error_msg)
                # 出错时关闭设备
                self.obj_cam_operation.Close_device()
                self.isOpen = False
                return False
            
            # 获取参数
            ret = self.obj_cam_operation.Get_parameter()
            if ret != 0:
                error_msg = f"获取相机参数失败! 错误码: 0x{ret:x}"
                logging.error(error_msg)
                # 继续执行，不返回失败
            
            self.isOpen = True
            logging.info(f"相机已成功打开，设备索引: {device_index}")
            
            return True
            
        except Exception as e:
            error_msg = f"打开相机时发生异常: {str(e)}"
            logging.error(error_msg)
            self.isOpen = False
            return False
    
    def close_device(self):
        """关闭相机设备
        
        Returns:
            bool: 是否成功关闭设备
        """
        if not self.isOpen:
            return True
        
        try:
            # 确保停止取图
            if self.isGrabbing:
                self.stop_grabbing()
            
            # 关闭设备
            ret = self.obj_cam_operation.Close_device()
            if ret != 0:
                error_msg = f"关闭相机失败! 错误码: 0x{ret:x}"
                logging.error(error_msg)
                return False
            
            self.isOpen = False
            logging.info("相机已关闭")
            
            return True
            
        except Exception as e:
            error_msg = f"关闭相机时发生异常: {str(e)}"
            logging.error(error_msg)
            self.isOpen = False  # 强制设置为关闭状态
            return False
    
    def start_grabbing(self, window_id):
        """开始取图
        
        Args:
            window_id: 显示窗口句柄
            
        Returns:
            bool: 是否成功开始取图
        """
        if not self.isOpen:
            logging.error("相机未打开，无法开始取图")
            return False
        
        if self.isGrabbing:
            logging.warning("相机已经在取图")
            return True
        
        try:
            ret = self.obj_cam_operation.Start_grabbing(window_id)
            if ret != 0:
                error_msg = f"开始取图失败! 错误码: 0x{ret:x}"
                logging.error(error_msg)
                return False
            
            self.isGrabbing = True
            logging.info("开始图像采集")
            
            return True
            
        except Exception as e:
            error_msg = f"开始取图时发生异常: {str(e)}"
            logging.error(error_msg)
            return False
    
    def stop_grabbing(self):
        """停止取图
        
        Returns:
            bool: 是否成功停止取图
        """
        if not self.isOpen:
            return True
        
        if not self.isGrabbing:
            return True
        
        try:
            ret = self.obj_cam_operation.Stop_grabbing()
            if ret != 0:
                error_msg = f"停止取图失败! 错误码: 0x{ret:x}"
                logging.error(error_msg)
                return False
            
            self.isGrabbing = False
            logging.info("停止图像采集")
            
            return True
            
        except Exception as e:
            error_msg = f"停止取图时发生异常: {str(e)}"
            logging.error(error_msg)
            self.isGrabbing = False  # 强制设置为非取图状态
            return False
    
    def get_parameters(self):
        """获取相机参数
        
        Returns:
            tuple: (曝光时间, 增益, 帧率) 或 None (如果失败)
        """
        if not self.isOpen:
            logging.error("相机未打开，无法获取参数")
            return None
        
        try:
            ret = self.obj_cam_operation.Get_parameter()
            if ret != 0:
                error_msg = f"获取相机参数失败! 错误码: 0x{ret:x}"
                logging.error(error_msg)
                return None
            
            exposure_time = self.obj_cam_operation.exposure_time
            gain = self.obj_cam_operation.gain
            frame_rate = self.obj_cam_operation.frame_rate
            
            logging.info(f"获取相机参数: 曝光={exposure_time}, 增益={gain}, 帧率={frame_rate}")
            
            return (exposure_time, gain, frame_rate)
            
        except Exception as e:
            error_msg = f"获取相机参数时发生异常: {str(e)}"
            logging.error(error_msg)
            return None
    
    def set_parameters(self, frame_rate, exposure_time, gain):
        """设置相机参数
        
        Args:
            frame_rate: 帧率
            exposure_time: 曝光时间
            gain: 增益
            
        Returns:
            bool: 是否成功设置参数
        """
        if not self.isOpen:
            logging.error("相机未打开，无法设置参数")
            return False
        
        try:
            # 设置参数
            ret = self.obj_cam_operation.Set_parameter(str(frame_rate), str(exposure_time), str(gain))
            if ret != 0:
                error_msg = f"设置相机参数失败! 错误码: 0x{ret:x}"
                logging.error(error_msg)
                return False
            
            logging.info(f"设置相机参数: 曝光={exposure_time}, 增益={gain}, 帧率={frame_rate}")
            
            return True
            
        except Exception as e:
            error_msg = f"设置相机参数时发生异常: {str(e)}"
            logging.error(error_msg)
            return False
    
    def save_params_to_config(self, exposure, gain, frame_rate):
        """保存相机参数到配置文件
        
        Args:
            exposure: 曝光值(滑块值)
            gain: 增益(滑块值)
            frame_rate: 帧率(滑块值)
            
        Returns:
            bool: 是否成功保存参数
        """
        try:
            # 创建相机参数配置
            config = {
                "exposure": exposure,
                "gain": gain,
                "frame_rate": frame_rate
            }
            
            # 保存到配置文件
            config_path = os.path.join(os.path.dirname(os.path.dirname(__file__)), "config", "camera_config.json")
            os.makedirs(os.path.dirname(config_path), exist_ok=True)
            
            # 检查文件是否存在并读取
            if os.path.exists(config_path):
                with open(config_path, 'r', encoding='utf-8') as f:
                    try:
                        full_config = json.load(f)
                    except json.JSONDecodeError:
                        full_config = {}
            else:
                full_config = {}
                
            # 更新配置
            full_config["camera_params"] = config
            
            # 写入文件
            with open(config_path, 'w', encoding='utf-8') as f:
                json.dump(full_config, f, indent=4, ensure_ascii=False)
                
            logging.info(f"相机参数已保存到配置文件: {config_path}")
            return True
            
        except Exception as e:
            error_msg = f"保存相机参数到配置文件时发生异常: {str(e)}"
            logging.error(error_msg)
            return False