import socket
import struct
import ctypes

class OutOfRange(Exception):
	pass

class Beleuchtung(object):
	def __init__(self, segments, addr):
		if len(segments) == 0:
			raise OutOfRange
		if len(addr) == 0:
			raise OutOfRange
		self.segments = segments
		num_of_leds = 0
		for i in segments:
			num_of_leds += i
		self.data = [0,0,0] * num_of_leds
		self.addr = addr
		self.s = [socket.socket(socket.AF_INET, socket.SOCK_DGRAM) for i in addr]

	def __del__(self):
		del self.s

	def get_num_of_segments(self):
		return len(self.segments)

	def set_segment(self, num, data):
		if num < 0 or num >= len(self.segments):
			raise OutOfRange
		i = 0
		for j in self.segments[:num]:
			i += j
		i *= 3
		self.data = self.data[:i] + data * self.segments[num] + self.data[i+self.segments[num]*3:]

	def send(self):
		for i in range(len(self.addr)):
			self.s[i].sendto(b'r' + struct.pack(">H", len(self.data) + 2) + b'\x00\x00' + bytes(self.data), self.addr[i])