# -*- python-mode -*-
# -*- coding: UTF-8 -*-

## Copyright (C) 2012-2013  Daniel Pavel
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License along
## with this program; if not, write to the Free Software Foundation, Inc.,
## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

from __future__ import absolute_import, division, print_function, unicode_literals

from time import time as _timestamp

from logitech_receiver import base as _base
from logitech_receiver import hidpp10 as _hidpp10
from logitech_receiver import notifications as _notifications
from logitech_receiver import status as _status


def run(receivers, args, find_receiver, _ignore):
    assert receivers

    if args.receiver:
        receiver_name = args.receiver.lower()
        receiver = find_receiver(receiver_name)
        if not receiver:
            raise Exception("no receiver found matching '%s'" % receiver_name)
    else:
        receiver = receivers[0]

    assert receiver
    receiver.status = _status.ReceiverStatus(receiver, lambda *args, **kwargs: None)

    # check if it's necessary to set the notification flags
    old_notification_flags = _hidpp10.get_notification_flags(receiver) or 0
    if not (old_notification_flags & _hidpp10.NOTIFICATION_FLAG.wireless):
        _hidpp10.set_notification_flags(receiver, old_notification_flags | _hidpp10.NOTIFICATION_FLAG.wireless)

    # get all current devices
    known_devices = [dev.number for dev in receiver]

    class _HandleWithNotificationHook(int):
        def notifications_hook(self, n):
            nonlocal known_devices
            assert n
            if n.devnumber == 0xFF:
                _notifications.process(receiver, n)
            elif n.sub_id == 0x41:  # allow for other protocols! (was and n.address == 0x04)
                kd, known_devices = known_devices, None  # only process one connection notification
                if kd is not None:
                    if n.devnumber not in kd:
                        receiver.status.new_device = receiver.register_new_device(n.devnumber, n)
                    elif receiver.re_pairs:
                        del receiver[n.devnumber]  # get rid of information on device re-paired away
                        receiver.status.new_device = receiver.register_new_device(n.devnumber, n)

    timeout = 20  # seconds
    receiver.handle = _HandleWithNotificationHook(receiver.handle)

    receiver.set_lock(False, timeout=timeout)
    print('Pairing: turn your new device on (timing out in', timeout, 'seconds).')

    # the lock-open notification may come slightly later, wait for it a bit
    pairing_start = _timestamp()
    patience = 5  # seconds

    while receiver.status.lock_open or _timestamp() - pairing_start < patience:
        n = _base.read(receiver.handle)
        if n:
            n = _base.make_notification(*n)
            if n:
                receiver.handle.notifications_hook(n)

    if not (old_notification_flags & _hidpp10.NOTIFICATION_FLAG.wireless):
        # only clear the flags if they weren't set before, otherwise a
        # concurrently running Solaar app might stop working properly
        _hidpp10.set_notification_flags(receiver, old_notification_flags)

    if receiver.status.new_device:
        dev = receiver.status.new_device
        print('Paired device %d: %s (%s) [%s:%s]' % (dev.number, dev.name, dev.codename, dev.wpid, dev.serial))
    else:
        error = receiver.status.get(_status.KEYS.ERROR)
        if error:
            raise Exception('pairing failed: %s' % error)
        else:
            print('Paired a device')  # this is better than an error