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'''Generates the byte array for setting the global brightness.'''
def CMD_Set_BC(brightness):
        barray = bytearray.fromhex('7E 00 02 0A')
        barray.extend([brightness])
        barray.extend([Calculate_Checksum(barray)])
        return barray

'''Generates the byte array for clearing all pixels.'''
def CMD_Clear():
        return bytearray.fromhex('7E 00 01 0B F4')

'''Generates the command for setting a specific pixel.'''
def CMD_Set_Pixel(layer, row, column, r, g, b):
        barray = bytearray.fromhex('7E 00 07 10')
        barray.extend([layer,row,column,r,g,b,])
        barray.extend([Calculate_Checksum(barray)])
        return barray

'''Generates the command for setting the entire cube.'''
def CMD_Set_All(leds):
        barray = bytearray.fromhex('7E 09 01 11')
        barray.extend(leds)
        barray.extend([Calculate_Checksum(barray)])
        return barray

'''Generates the command for setting the rotating overlay text.'''
def CMD_Start_Text(r, g, b, string):
        length = len(string) + 4
        barray = bytearray.fromhex('7E 00') 
        barray.extend([length, 0x20, r, g, b])
        barray.extend(string.encode())
        barray.extend([Calculate_Checksum(barray)])
        return barray

'''Generates the command for stopping the rotating overlay text.'''
def CMD_Stop_Text():
        return bytes.fromhex('7E 00 01 21 DE')

def Calculate_Checksum(barray):
        s = 0
        for entry in range(3,len(barray)):
                s += barray[entry]
        return 255 - (s & 0xFF)