#!/usr/bin/env python3
"""
    Open Sound Control send/recieve daemon for Tascam Firewire control surface
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    :copyright: Copyright (c) 2018 Scott Bahling
        This program is free software; you can redistribute it and/or modify
        it under the terms of the GNU General Public License version 2 as
        published by the Free Software Foundation.

        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 (see the file COPYING); if not, write to the
        Free Software Foundation, Inc.,
        51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
    :license: GPL-2.0, see COPYING for details
"""


class Encoder():
    def __init__(self):
        self.name = 'Unknown'
        self.update_callbacks = set()

    def update(self, delta):
        print('Encoder: ', self.name, delta)
        for callback in self.update_callbacks:
            try:
                callback(delta)
            except Exception('Encoder update callback failed') as e:
                raise(e)

    def add_callback(self, callback):
        self.update_callbacks.add(callback)

    def remove_callback(self, callback):
        self.update_callbacks.remove(callback)