#!/usr/bin/env python3
#ros2 run camera_test camera_server
import rclpy
from rclpy.node import Node
from sensor_msgs.msg import Image
from cv_bridge import CvBridge
import cv2
import os
from pyzbar import pyzbar
from threading import Thread, Lock
import time
import queue
from datetime import datetime 
#from utils.log_helper import get_logger
# 导入AI相机服务
from protocol.srv import CameraService

#!/usr/bin/env python3
import rclpy
from rclpy.node import Node
from sensor_msgs.msg import Image
from cv_bridge import CvBridge
import cv2
import os
import time
from datetime import datetime
from protocol.srv import CameraService

class ImageSubscriber(Node):
    def __init__(self):
        super().__init__('image_subscriber')
        
        # 初始化安全控制标志
        self._shutdown_flag = False
        self._ros_initialized = True
        
        # 创建服务客户端
        self.camera_client = self.create_client(CameraService, '/camera_service')
        while not self.camera_client.wait_for_service(timeout_sec=1.0):
            self.get_logger().info('等待AI相机服务...')
        
        # 图像订阅
        self.image_sub = self.create_subscription(
            Image, '/image', self.image_callback, 10
        )
        
        # 工具初始化
        self.bridge = CvBridge()
        self.cv_image = None
        self.camera_started = False
        
        # 截图控制参数
        self.last_save_time = time.time()
        self.start_time = time.time()
        self.save_interval = 0.5
        self.total_duration = 1.0
        self.save_dir = "saved_images"
        os.makedirs(self.save_dir, exist_ok=True)
        
        # 安全启动相机
        self.start_camera()

    def start_camera(self):
        """安全启动相机"""
        if not self._ros_initialized:
            return False
            
        req = CameraService.Request()
        req.command = 9
        req.width, req.height, req.fps = 640, 480, 30
        
        future = self.camera_client.call_async(req)
        rclpy.spin_until_future_complete(self, future)
        
        result = future.result()
        self.get_logger().info(f'服务返回: [code={result.result}, msg="{result.msg}"]')
        
        if result.result == 0:
            self.get_logger().info('相机启动成功')
            self.camera_started = True
            return True
        else:
            self.get_logger().error(f'启动失败 (错误码 {result.result})')
            return False

    def stop_camera(self):
        """安全停止相机"""
        if not self.camera_started or not self._ros_initialized:
            return True
            
        req = CameraService.Request()
        req.command = 10
        
        try:
            future = self.camera_client.call_async(req)
            rclpy.spin_until_future_complete(self, future, timeout_sec=2.0)
            
            if future.result().result == 0:
                self.get_logger().info('相机已停止')
                self.camera_started = False
                return True
            else:
                self.get_logger().error(f'停止失败: {future.result().msg}')
                return False
        except Exception as e:
            self.get_logger().error(f'停止异常: {str(e)}')
            return False

    def save_image(self):
        """安全保存图像"""
        if self.cv_image is None:
            self.get_logger().warning("无有效图像可保存")
            return False
            
        try:
            timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
            filename = f"{self.save_dir}/capture_{timestamp}.jpg"
            cv2.imwrite(filename, self.cv_image)
            self.get_logger().info(f"截图已保存: {filename}")
            return True
        except Exception as e:
            self.get_logger().error(f"保存失败: {str(e)}")
            return False

    def image_callback(self, msg):
        """安全的图像回调"""
        if getattr(self, '_shutdown_flag', False):
            return
            
        current_time = time.time()
        elapsed = current_time - self.start_time
        
        if elapsed >= self.total_duration:
            self.get_logger().info("已完成30秒截图任务")
            self._shutdown_flag = True
            return
            
        try:
            self.cv_image = self.bridge.imgmsg_to_cv2(msg, 'bgr8')
            
            if current_time - self.last_save_time >= self.save_interval:
                if self.save_image():
                    self.last_save_time = current_time
        except Exception as e:
            self.get_logger().error(f"图像处理错误: {str(e)}")

    def safe_spin(self):
        """安全spin循环"""
        while rclpy.ok() and not getattr(self, '_shutdown_flag', False):
            rclpy.spin_once(self, timeout_sec=0.1)

    def destroy(self):
        """安全销毁节点"""
        if not self._ros_initialized:
            return
            
        self.stop_camera()
        self._shutdown_flag = True
        if hasattr(self, '_ros_initialized'):
            self.destroy_node()
            rclpy.shutdown()

    def get_latest_image(self):
        """外部获取最新图像接口"""
        return self.cv_image.copy() if self.cv_image is not None else None


class ImageProcessor:
    def __init__(self):
        self.image_subscriber = ImageSubscriber()
        self.spin_thread = None
        self.running = True
        # self.log = get_logger("图像处理器")
        
        # 异步 QR 码扫描相关
        self.scan_thread = None
        self.image_queue = queue.Queue(maxsize=3)  # 限制队列大小，只保留最新的图像
        self.scan_lock = Lock()
        self.last_qr_result = None
        self.last_qr_time = 0
        self.is_scanning = False
        self.enable_async_scan = False
    
    def run(self):
        self.spin_thread = Thread(target=self._spin)
        self.spin_thread.start()
    
    def _spin(self):
        try:
            while self.running:
                rclpy.spin_once(self.image_subscriber, timeout_sec=0.1)
        except Exception as e:
            # self.log.error(f"Spin线程错误: {e}", "错误")
            print('threat wrong')
    
    def destroy(self):
        self.running = False
        self.stop_async_scan()
        if self.spin_thread:
            self.spin_thread.join()
        # 停止AI相机
        self.image_subscriber.stop_camera()
        self.image_subscriber.destroy_node()

    def get_current_image(self):
        return self.image_subscriber.cv_image
    
    def decode_qrcode(self, img=None):
        """使用pyzbar解码QR码"""
        if img is None:
            img = self.get_current_image()
        
        if img is None:
            return None
            
        try:
            # 使用pyzbar解码所有条形码/QR码
            decoded_objects = pyzbar.decode(img)
            
            if decoded_objects:
                # 返回第一个QR码的数据（解码为字符串）
                qr_data = decoded_objects[0].data.decode('utf-8')
                return qr_data
            
            return None
        except Exception as e:
            print(f"QR码解码错误: {str(e)}")
            return None
    
    def decode_all_qrcodes(self, img=None):
        """解码图像中的所有QR码/条形码"""
        if img is None:
            img = self.get_current_image()
        
        if img is None:
            return []
            
        try:
            decoded_objects = pyzbar.decode(img)
            results = []
            
            for obj in decoded_objects:
                result = {
                    'data': obj.data.decode('utf-8'),
                    'type': obj.type,
                    'rect': obj.rect,  # 位置信息 (x, y, width, height)
                    'polygon': obj.polygon  # 多边形顶点
                }
                results.append(result)
            
            return results
        except Exception as e:
            print(f"批量QR码解码错误: {str(e)}")
            return []
    
    def start_async_scan(self, interval=0.3):
        """
        启动异步 QR 码扫描
        
        参数:
            interval: 扫描间隔，单位秒
        """
        if self.scan_thread is not None and self.scan_thread.is_alive():
            # self.log.warning("异步扫描已经在运行中", "警告")
            print('scan,warn')
            return
        
        self.enable_async_scan = True
        self.is_scanning = False
        self.scan_thread = Thread(target=self._async_scan_worker, args=(interval,))
        self.scan_thread.daemon = True  # 设为守护线程，主线程结束时自动结束
        self.scan_thread.start()
        # self.log.info("启动异步 QR 码扫描线程", "启动")
        print('start')
    
    def stop_async_scan(self):
        """停止异步 QR 码扫描"""
        self.enable_async_scan = False
        if self.scan_thread and self.scan_thread.is_alive():
            self.scan_thread.join(timeout=1.0)
            # self.log.info("异步 QR 码扫描线程已停止", "停止")
            print('stop')
    
    def _async_scan_worker(self, interval):
        """异步扫描工作线程"""
        last_scan_time = 0
        
        while self.enable_async_scan and self.running:
            current_time = time.time()
            
            # 按指定间隔扫描
            if current_time - last_scan_time >= interval:
                img = self.get_current_image()
                if img is not None:
                    try:
                        self.is_scanning = True
                        qr_data = self.decode_qrcode(img)
                        self.is_scanning = False
                        
                        with self.scan_lock:
                            if qr_data:
                                self.last_qr_result = qr_data
                                self.last_qr_time = current_time
                                # self.log.success(f"异步扫描到 QR 码: {qr_data}", "扫描")
                                print(f"异步扫描到 QR 码: {qr_data}")
                    except Exception as e:
                        self.is_scanning = False
                        # self.log.error(f"异步 QR 码扫描出错: {e}", "错误")
                        print(f"异步 QR 码扫描出错: {e}")
                
                last_scan_time = current_time
            
            # 短暂休眠避免占用过多 CPU
            time.sleep(0.05)
    
    def get_last_qr_result(self):
        """获取最后一次成功扫描的 QR 码结果"""
        with self.scan_lock:
            return self.last_qr_result, self.last_qr_time


""" DEBUG """

# def main(args=None):
#     rclpy.init(args=args)
#     image_subscriber = ImageSubscriber()
    
#     try:
#         rclpy.spin(image_subscriber)
#     except KeyboardInterrupt:
#         pass
    
#     # 清理
#     image_subscriber.stop_camera()
#     image_subscriber.destroy_node()


# if __name__ == '__main__':
#        main()