import socket
import ws2801
import re

def validate_data(data):
    reg = re.compile("[0-9a-f]{6}$")
    return reg.match(data)

def start():
    host = "0.0.0.0" 
    port = 5000  

    server_socket = socket.socket()
    server_socket.bind((host, port)) 

    # configure how many client the server can listen simultaneously
    server_socket.listen(1)
    while True:
        conn, address = server_socket.accept()  # accept new connection
        print("Connection from: " + str(address))
        # receive data stream. it won't accept data packet greater than 1024 bytes
        data = conn.recv(1024).decode()
        if not data:
            print("Disconnected: " + str(address))
            break
        if validate_data(data):   
            r,g,b = ws2801.hex_to_rgb(data)
            ws2801.set_color(r,g,b)
        else:
            print("incorrect format. use hex color code.")
    conn.close()  # close the connection