#!/usr/bin/env python

import datetime
import sys

from asterisk.agi import AGI

# Use next matched number after TIMEOUT seconds
TIMEOUT = 30

def part_match(value, e):
    """Matches single part of cron-like range expression"""
    if e == '*':
        return True
    elif '/' in e:
        everything, diff = e.split('/')
        return part_match(value, everything) and value % int(diff) == 0
    elif '-' in e:
        start, end = map(int, e.split('-', 1))
        return value >= start and value <= end
    else:
        return int(e) == value

def cron_match(value, expr):
    """Matches cron-like range expression"""
    return any(part_match(value, e) for e in expr.split(','))

def cronline_match(dt, expr):
    """Matches cron-like expression to provided datetime"""
    return all([
        cron_match(t, e)
        for t, e in
        zip([dt.minute, dt.hour, dt.day, dt.month, dt.weekday()], expr.split())
        ])

def phonetab_list(fname, dt):
    """Returns matches for provided datetime from phonetab file"""
    with open(fname) as fd:
        return [
            line.rsplit(None, 1)[1]
            for line in fd
            if line.strip()
                and not line.startswith('#')
                and cronline_match(dt, line.rsplit(None, 1)[0])
            ]

if __name__ == "__main__":
    agi = AGI()
    agi.verbose('Testing shite')
    numbers = phonetab_list(sys.argv[1], datetime.datetime.now())
    agi.verbose(str(numbers))

    for num in numbers:
        # Default to SIP/...@trunk-out if no type specified, multiple numbers
        # can be comma-separated
        # Example:
        # 123456789,SIP/2137@local -> SIP/123456789@trunk-out&SIP/2137@local
        numlist = [(n if '/' in n else 'SIP/%s@trunk-out' % n)for n in num.split(',')]
        dialpath = '&'.join(numlist)

        agi.verbose('Dialing %s' % (dialpath,))
        res = agi.appexec('Dial', '%s,%d,m' % (dialpath, TIMEOUT))
        agi.verbose('Response: %r' % res)

        dialstatus = agi.get_variable('DIALSTATUS')
        agi.verbose('Dialstatus: %r' % dialstatus)

        if dialstatus == 'ANSWER':
            break

        agi.appexec("Agi", 'googletts.agi,\\"All lines are currently busy. Please try again later.\\",en')

        agi.verbose('Number timed out, next...')
    else:
        agi.verbose('No more numbers')