# vim: tabstop=4 softtabstop=4 shiftwidth=4 textwidth=80 smarttab expandtab

"""
WARNING: only the main call path is tested, refer_to, qa_testphone, Alert-Info
or any other of the customizations are untested but, if at all, should require
only a tweak here and there ...
ideally you can start now wrapping around freeswitch.Session data type
to create a nice class that does not require session.getVariable()
session.execute() and such and create a better API for executing
APIs and Applications, retrieving variables, etc

You have to call this script from the XML dialplan using:

<condition>
    <action application="python" data="proxy" />
</condition>

The FreeSWITCH python app looks for scripts in site-packages for our python2.7
interpreter and in /usr/local/nsc/conf/scripts as well

Note the scripts/ folder is messed up now in NSC, someone decided to start
throwing shit there when that folder was supposed to contain only scripts that freeswitch invokes
"""

import freeswitch
import socket

def handler(session, args):
    freeswitch.consoleLog('crit', 'Routing session in python: {}\n'.format(type(session).__name__))

    dest = session.getVariable('sip_req_uri') # default destination
    refer_to = session.getVariable('sip_refer_to')
    profile = session.getVariable('sofia_profile_name')

    session.execute('info')

    # If there's refer information, route there ...
    if refer_to:
        freeswitch.consoleLog('crit', 'Routing to refer destination {}\n'.format(refer_to))
        session.execute('bridge', 'sofia/{}/{}'.format(profile, refer_to))
        return

    # Set a specific outbound Call-ID header if requested by the inbound leg
    outbound_cid = session.getVariable('sip_h_X-qa-outbound-cid')
    if outbound_cid:
        session.execute('export', 'nolocal:sip_h_Call-ID={}'.format(refer_to))

    # Use a diferent destination if requested
    outbound_cb_did = session.getVariable('sip_h_X-qa-callback-did')
    if outbound_cb_did:
        dest = outbound_cb_did

    # Use a diferent destination if requested
    mh_alert = session.getVariable('sip_mh_Alert-Info')
    if mh_alert:
        dest = outbound_cb_did
        session.execute('export', 'nolocal:alert_info-{}'.format(mh_alert))


    # Special destination for contacting a local phone registered in the SBC
    # IMO this should be re-arranged for something more flexible like
    # passing a SIP R-URI parameter 'qa_testphone' that indicates the
    # destination user is registered in the SBC which allows calling
    # different users registered on the SBC at any given point
    if dest == 'qa_testphone':
        hostname = socket.gethostname()
        local_ipv4 = session.getVariable('local_ip_v4')
        api = freeswitch.API()
        c1 = api.executeString('sofia_contact qa_testphone@{}.sangoma.local'.format(hostname))
        c2 = api.executeString('sofia_contact qa_testphone@{}'.format(local_ipv4))
        session.execute('bridge', 'sofia/{}/{}'.format(profile, dest))
        return


    if dest:
        session.execute('bridge', 'sofia/{}/{}'.format(profile, dest))
    else:
        freeswitch.consoleLog('crit', 'No destination! WTF!\n')
        session.execute('respond', '500 WTF')