# TODO: deal with length stuff
import urllib
import serial
import re

MAXLENGTH = 512
BANNER = " BZZTBOMB DOT COM "

def getmessages():
    # Get a file-like object for the Python Web site's home page.
    f = urllib.urlopen("http://bzztbomb.com/dotdash/messages.txt")
    # Read from the object, storing the page's contents in 's'.
    s = f.read()
    f.close()
    return s

def formatmessage(msg):
    msg = msg.upper()
    p = re.compile('[^0-9^A-Z^ ^\n]')
    msg = p.sub(' ', msg)

    ret = ''
    lines = msg.split('\n')
    for s in lines:
        if (len(s) > 0):
            if (len(ret) + len(s) < MAXLENGTH):
                ret = ret + s
            if (len(ret) + len(BANNER) < MAXLENGTH):
                ret = ret + BANNER    
    ret = chr(len(ret) >> 8) + chr(len(ret) & 0xFF) + ret
    return ret
        
def waitfor(port, msg):
    line = ''
    while line.lower() != msg.lower():
        line = port.readline()
        print line
    print "waitfor done!"
#
#
def mainstuff():
    oldmessage = ''
    while True:    
        msg = getmessages()

        ser = serial.Serial('COM6', 9600)  # open first serial port
        print ser.portstr       # check which port was really used

        if (msg != oldmessage):
            oldmessage = msg
            msg = formatmessage(msg)
            print len(msg)-2
            print msg
            ser.write(msg)

            waitfor(ser, 'done!\r\n')

        # get one rotation out!
        waitfor(ser, 'EOM\r\n')
        ser.close()             # close port

mainstuff()