import logging
import os
from pydbus import SystemBus
from gi.repository import GLib


# Setup logging
logfile = "/opt/sms/sms.log"
FORMAT = '%(asctime)-15s %(message)s'
logging.basicConfig(format=FORMAT,filename=logfile,level=10)
logger = logging.getLogger('observiumsms')

class ModemManagerError(Exception):
    def __init__(self, value):
        self.value = value
    def __str__(self):
        return repr(self.value)
		
class SIMError(ModemManagerError):
    def __init__(self, value):
        self.value = value
    def __str__(self):
        return repr(self.value)

def assemble_sms():
    str_list = []
    str_list.append("Observium {}\n".format(os.environ.get('OBSERVIUM_TITLE')))
    str_list.append("{} [{}]\n".format(os.environ.get('OBSERVIUM_ENTITY_NAME'), os.environ.get('OBSERVIUM_ENTITY_DESCRIPTION')))
    str_list.append("{}".format(os.environ.get('OBSERVIUM_DURATION')))
    return ''.join(str_list)

def get_modem():
    # Contact ModemManager, unlock SIM and send SMS to emergency numbers
    with SystemBus() as bus:
        mm = bus.get('.ModemManager1')
        modems = mm.GetManagedObjects()
        if not modems or len(modems) == 0:
           raise ModemManagerError('No modems found') 
        modem_path = list(modems.keys())[0]
    
        logger.info("Going with %s", modem_path)
        modem = bus.get(".ModemManager1", modem_path)
        return modem

def unlock_sim(modem):
    sim_path = modem.Sim
    if not sim_path:
        raise SIMError('No SIM card found') 
            
    # unlock SIM, if not alreadY
    props = modem.GetStatus()
    print(props)
    if props and props['state'] == 2:
        logger.info("Trying to unlock %s", sim_path)
        with SystemBus() as bus:
            sim = bus.get('.ModemManager1', sim_path)
            sim.SendPin("1234", timeout=10000)
            props = modem.GetStatus()
            if props and props['state'] == 2:
                remaining_attempts = modem.UnlockRetries
                print(remaining_attempts)
                raise SIMError('Wrong PIN!')

def send_sms(recipients, smsstring):
    
    # Assemble SMS
    logger.info("Sending SMS: %s", smsstring)
    
    # Get modem, unlock SIM
    modem = get_modem()
    unlock_sim(modem)
    
    # enable the modem
    modem.Enable(True)
    
    # test sending SMS
    modem_msg = modem['org.freedesktop.ModemManager1.Modem.Messaging']
    smses = modem_msg.List()

    print(modem.GetStatus()['signal-quality'])

    for line in recipients:
        line = line.strip()
        if not line:
                continue

        logger.info("Creating new SMS for %s", line)
        smstext = GLib.Variant('s', smsstring)
        smsnumber = GLib.Variant('s', line)
        
        dictsms = { 'text': smstext, 'number': smsnumber }

        msgpath = modem_msg.Create(dictsms)
        logger.info("Created new SMS %s", msgpath)

        logger.info("Sending SMS %s", msgpath)
        with SystemBus() as bus:
            sms = bus.get(".ModemManager1", msgpath)
            sms.Send(timeout=30000)
            
            logger.info("SMS %s state %s", msgpath, sms.State)