license_plate_recognition/bx/BxCmdBrightness.py

from .BxCmd import baseBxCmd, newBaseCmd
from .BxCmdCode import CMD_SCREEN_BRIGHTNESS


class CmdBrightness(baseBxCmd):
    def __init__(self, brightnessType, currentBrightness, brightnessValue):
        # 初始化基础命令
        super().__init__(CMD_SCREEN_BRIGHTNESS.group, CMD_SCREEN_BRIGHTNESS.code)
        self.BrightnessType = brightnessType
        
        # 处理亮度值边界（0-15）
        self.CurrentBrightness = currentBrightness
        if self.CurrentBrightness > 15:
            self.CurrentBrightness = 15
        
        # 处理定时调节的亮度列表长度（确保为48字节）
        self.BrightnessValue = processBrightnessValue(brightnessValue)

    def SetBrightnessType(self, brightnessType):
        self.BrightnessType = brightnessType
        # 切换为定时调节时自动初始化48字节亮度列表
        if brightnessType == 0x02 and len(self.BrightnessValue) != 48:
            self.BrightnessValue = bytearray(48)

    def SetCurrentBrightness(self, currentBrightness):
        if currentBrightness > 15:
            currentBrightness = 15
        self.CurrentBrightness = currentBrightness

    def SetBrightnessValue(self, brightnessValue):
        self.BrightnessValue = processBrightnessValue(brightnessValue)

    def Build(self):
        result = bytearray()
        
        # 写入命令组
        result.append(self.Group())
        # 写入命令
        result.append(self.Cmd())
        # 写入响应标志
        result.append(0x01)
        # 写入保留值
        result.extend([0x00, 0x00])
        # 写入亮度调节方式
        result.append(self.BrightnessType)
        
        # 根据调节方式写入后续参数
        if self.BrightnessType == 0x01:
            # 强制调节：写入亮度值（0-15）
            result.append(self.CurrentBrightness)
        elif self.BrightnessType == 0x02:
            # 定时调节：写入默认亮度值0和48字节亮度列表
            result.append(0x00)
            result.extend(self.BrightnessValue)
        else:
            # 无效类型默认按强制调节处理（亮度0）
            result.append(0x00)
        
        return bytes(result)


# 处理定时调节的亮度列表（确保长度为48字节）
def processBrightnessValue(value):
    result = bytearray(48)
    if value:
        if len(value) > 48:
            result[:48] = value[:48]  # 超出部分截取
        else:
            result[:len(value)] = value  # 不足部分补0
    
    # 确保每个亮度值在0-15范围内
    for i in range(len(result)):
        if result[i] > 15:
            result[i] = 15
    
    return result


# 初始化亮度设置命令
def NewCmdBrightness(brightnessType, currentBrightness, brightnessValue):
    return CmdBrightness(brightnessType, currentBrightness, brightnessValue)