#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
激光管理器模块
提供激光控制、校准等功能
"""
import json
import os
import binascii
from maix import time, camera
import threading
import config
from logger_manager import logger_manager


class LaserManager:
    """激光控制管理器（单例）"""
    _instance = None
    
    def __new__(cls):
        if cls._instance is None:
            cls._instance = super(LaserManager, cls).__new__(cls)
            cls._instance._initialized = False
        return cls._instance
    
    def __init__(self):
        if self._initialized:
            return
        
        # 私有状态
        self._calibration_active = False
        self._calibration_result = None
        self._calibration_lock = threading.Lock()
        self._laser_point = None
        self._laser_turned_on = False
        self._initialized = True
    
    # ==================== 状态访问（只读属性）====================
    
    @property
    def calibration_active(self):
        """是否正在校准"""
        return self._calibration_active
    
    @property
    def laser_point(self):
        """当前激光点"""
        return self._laser_point
    
    # ==================== 业务方法 ====================
    
    def load_laser_point(self):
        """从配置文件加载激光中心点，失败则使用默认值"""
        try:
            if "laser_config.json" in os.listdir("/root"):
                with open(config.CONFIG_FILE, "r") as f:
                    data = json.load(f)
                    if isinstance(data, list) and len(data) == 2:
                        self._laser_point = (int(data[0]), int(data[1]))
                        logger = logger_manager.logger
                        if logger:
                            logger.debug(f"[INFO] 加载激光点: {self._laser_point}")
                        return self._laser_point
                    else:
                        raise ValueError
            else:
                self._laser_point = config.DEFAULT_LASER_POINT
        except:
            self._laser_point = config.DEFAULT_LASER_POINT
        
        return self._laser_point
    
    def save_laser_point(self, point):
        """保存激光中心点到配置文件"""
        try:
            with open(config.CONFIG_FILE, "w") as f:
                json.dump([point[0], point[1]], f)
            self._laser_point = point
            return True
        except Exception as e:
            logger = logger_manager.logger
            if logger:
                logger.error(f"[LASER] 保存激光点失败: {e}")
            return False
    
    def turn_on_laser(self):
        """发送指令开启激光，并读取回包（部分模块支持）"""
        from hardware import hardware_manager
        logger = logger_manager.logger
        
        if hardware_manager.distance_serial is None:
            if logger:
                logger.error("[LASER] distance_serial 未初始化")
            return None
        
        # 打印调试信息
        if logger:
            logger.info(f"[LASER] 发送开启命令: {config.LASER_ON_CMD.hex()}")
        
        # 清空接收缓冲区
        try:
            hardware_manager.distance_serial.read(-1)  # 清空缓冲区
        except:
            pass
        
        # 发送命令
        written = hardware_manager.distance_serial.write(config.LASER_ON_CMD)
        if logger:
            logger.info(f"[LASER] 写入字节数: {written}")
        
        return None

        # TODO: 暂时去掉这个等待
        # 读取回包
        # print("before read:", time.ticks_ms())
        # resp = hardware_manager.distance_serial.read(len=20,timeout=10)
        # print("after read:", time.ticks_ms())
        # if resp:
        #     if logger:
        #         logger.info(f"[LASER] 收到回包 ({len(resp)}字节): {resp.hex()}")
        #     if resp == config.LASER_ON_CMD:
        #         if logger:
        #             logger.info("✅ 激光开启指令已确认")
        # else:
        #     if logger:
        #         logger.warning("🔇 无回包（可能正常或模块不支持回包）")
        # return resp
    
    def turn_off_laser(self):
        """发送指令关闭激光"""
        from hardware import hardware_manager
        logger = logger_manager.logger
        
        if hardware_manager.distance_serial is None:
            if logger:
                logger.error("[LASER] distance_serial 未初始化")
            return None
        
        # 打印调试信息
        if logger:
            logger.info(f"[LASER] 发送关闭命令: {config.LASER_OFF_CMD.hex()}")
        
        # 清空接收缓冲区
        try:
            hardware_manager.distance_serial.read(-1)
        except:
            pass
        
        # 发送命令
        written = hardware_manager.distance_serial.write(config.LASER_OFF_CMD)
        if logger:
            logger.info(f"[LASER] 写入字节数: {written}")
        
        
        # 读取回包
        # resp = hardware_manager.distance_serial.read(20)
        # if resp:
        #     if logger:
        #         logger.info(f"[LASER] 收到回包 ({len(resp)}字节): {resp.hex()}")
        # else:
        #     if logger:
        #         logger.warning("🔇 无回包")
        # return resp
        # 不用读回包
        return None 
    
    def flash_laser(self, duration_ms=1000):
        """闪一下激光（用于射箭反馈）"""
        try:
            self.turn_on_laser()
            time.sleep_ms(duration_ms)
            self.turn_off_laser()
        except Exception as e:
            logger = logger_manager.logger
            if logger:
                logger.error(f"闪激光失败: {e}")
    
    def find_red_laser(self, frame, threshold=150):
        """在图像中查找最亮的红色激光点（基于 RGB 阈值）"""
        w, h = frame.width(), frame.height()
        img_bytes = frame.to_bytes()
        max_sum = 0
        best_pos = None
        for y in range(0, h, 2):
            for x in range(0, w, 2):
                idx = (y * w + x) * 3
                r, g, b = img_bytes[idx], img_bytes[idx+1], img_bytes[idx+2]
                if r > threshold and r > g * 2 and r > b * 2:
                    rgb_sum = r + g + b
                    if rgb_sum > max_sum:
                        max_sum = rgb_sum
                        best_pos = (x, y)
        return best_pos
    
    def calibrate_laser_position(self):
        """执行一次激光校准：拍照 → 找红点 → 保存坐标"""
        time.sleep_ms(80)
        cam = camera.Camera(640, 480)
        frame = cam.read()
        pos = self.find_red_laser(frame)
        if pos:
            self.save_laser_point(pos)
            return pos
        return None
    
    def start_calibration(self):
        """开始校准（公共方法）"""
        with self._calibration_lock:
            if self._calibration_active:
                return False
            self._calibration_active = True
            self._calibration_result = None
            return True
    
    def stop_calibration(self):
        """停止校准（公共方法）"""
        with self._calibration_lock:
            self._calibration_active = False
    
    def set_calibration_result(self, result):
        """设置校准结果（内部方法）"""
        with self._calibration_lock:
            self._calibration_result = result
    
    def get_calibration_result(self):
        """获取并清除校准结果（内部方法）"""
        with self._calibration_lock:
            result = self._calibration_result
            self._calibration_result = None
            return result
    
    def parse_bcd_distance(self, bcd_bytes: bytes) -> float:
        """将 4 字节 BCD 码转换为距离（米）"""
        if len(bcd_bytes) != 4:
            return 0.0
        try:
            hex_string = binascii.hexlify(bcd_bytes).decode()
            distance_int = int(hex_string)
            return distance_int / 1000.0
        except Exception as e:
            logger = logger_manager.logger
            if logger:
                logger.error(f"[LASER] BCD 解析失败: {e}")
            return 0.0
    
    def read_distance_from_laser_sensor(self) -> float:
        """发送测距指令并返回距离（米）"""
        from hardware import hardware_manager
        logger = logger_manager.logger
        
        if hardware_manager.distance_serial is None:
            if logger:
                logger.error("[LASER] distance_serial 未初始化")
            return 0.0
        
        try:
            # 清空缓冲区
            try:
                hardware_manager.distance_serial.read(-1)
            except:
                pass
            # 打开激光

            self.turn_on_laser()
            self._laser_turned_on = True
            time.sleep_ms(40) # 需要一定时间让激光稳定
            # 发送测距查询命令
            hardware_manager.distance_serial.write(config.DISTANCE_QUERY_CMD)
            # time.sleep_ms(500) # 测试结果：这里的等待没有用！
            self.turn_off_laser()
            self._laser_turned_on = False

            # 这里的等待才是有效的！大概350ms能读到数据
            # 循环读取响应，最多等待500ms
            start_time = time.ticks_ms()
            max_wait_ms = 500
            response = None
            
            while True:
                # 检查是否超时
                elapsed_ms = time.ticks_diff(start_time,time.ticks_ms())
                print("elapsed_ms:", elapsed_ms)
                if elapsed_ms >= max_wait_ms:
                    if logger:
                        logger.warning(f"[LASER] 读取超时 ({elapsed_ms}ms)，未收到完整响应")
                    return 0.0
                
                # 尝试读取数据
                response = hardware_manager.distance_serial.read(config.DISTANCE_RESPONSE_LEN)
                
                # 如果读到完整数据，立即返回
                if response and len(response) == config.DISTANCE_RESPONSE_LEN:
                    elapsed_ms = time.ticks_diff(start_time,time.ticks_ms())
                    if logger:
                        logger.debug(f"[LASER] 收到响应 ({elapsed_ms}ms)")
                    break
                
                # 如果还没超时，短暂等待后继续尝试
                time.sleep_ms(10)  # 每次循环等待10ms，避免CPU占用过高
            
            # 验证响应格式
            if response and len(response) == config.DISTANCE_RESPONSE_LEN:
                if response[3] != 0x20:
                    if response[0] == 0xEE:
                        err_code = (response[7] << 8) | response[8]
                        if logger:
                            logger.warning(f"[LASER] 模块错误代码: {hex(err_code)}")
                    return 0.0
                
                # 解析BCD码距离
                bcd_bytes = response[6:10]
                distance_value_m = self.parse_bcd_distance(bcd_bytes)
                signal_quality = (response[10] << 8) | response[11]
                
                if logger:
                    logger.debug(f"[LASER] 测距成功: {distance_value_m:.3f} m, 信号质量: {signal_quality}")
                return distance_value_m
            
            if logger:
                logger.warning(f"[LASER] 无效响应: {response.hex() if response else 'None'}")
            return 0.0
        except Exception as e:
            logger = logger_manager.logger
            if logger:
                logger.error(f"[LASER] 读取激光测距失败: {e}")
            return 0.0
        
    def quick_measure_distance(self) -> float:
        """
        快速激光测距：打开激光 → 测距 → 关闭激光
        激光开启时间最小化（约500-600ms），尽量不让用户觉察到
        返回距离（米），失败返回0.0
        """
        logger = logger_manager.logger
        self._laser_turned_on = False
        
        try:

            
            # 等待激光稳定（最小延迟）
            # time.sleep_ms(50)
            
            # 读取距离
            distance_m = self.read_distance_from_laser_sensor()
            
            return distance_m
        except Exception as e:
            if logger:
                logger.error(f"[LASER] 快速测距异常: {e}")
            return 0.0
        finally:
            # 确保激光关闭
            if self._laser_turned_on:
                try:
                    self.turn_off_laser()
                except Exception as e:
                    if logger:
                        logger.error(f"[LASER] 关闭激光失败: {e}")


# 创建全局单例实例
laser_manager = LaserManager()

# ==================== 向后兼容的函数接口 ====================

def load_laser_point():
    """加载激光点（向后兼容接口）"""
    return laser_manager.load_laser_point()

def save_laser_point(point):
    """保存激光点（向后兼容接口）"""
    return laser_manager.save_laser_point(point)

def turn_on_laser():
    """开启激光（向后兼容接口）"""
    return laser_manager.turn_on_laser()

def turn_off_laser():
    """关闭激光（向后兼容接口）"""
    return laser_manager.turn_off_laser()

def flash_laser(duration_ms=1000):
    """闪激光（向后兼容接口）"""
    return laser_manager.flash_laser(duration_ms)

def find_red_laser(frame, threshold=150):
    """查找红色激光点（向后兼容接口）"""
    return laser_manager.find_red_laser(frame, threshold)

def calibrate_laser_position():
    """校准激光位置（向后兼容接口）"""
    return laser_manager.calibrate_laser_position()