#!/usr/bin/env python
# -*- coding: utf-8 -*-

# Copyright (c) 2009 Efrim <efrim@azylum.org> {{{
#
#   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 3 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, see <http://www.gnu.org/licenses/>.
#
#  }}}

"""
DOC:
    heavily borrowed from perl script mpdtoys and converted to python.
    mpdtoys © 2007 Joey Hess <joey@kitenet.net>
    http://kitenet.net/~joey/code/mpdtoys
"""

import sys

from time import sleep

from lib.mpdutils import mconnect

USAGE = """Usage:

mfade [time [min|max]]

   * time in seconds
   * min|max in percentag

when MPD is:
- not palying: fade in from 0% to max over time
               default 10 minutes / 50%
-    playing:  fade out from current volume to min over time
               default 10 minutes / 1/10 of current vol

Manual or any external volume change will abort the script.
"""


class Sleep(object):
    """
    """

    def __init__(self):
        """"""
        self.tempo = int(10)
        self.volum = None
        self._consume_sopt()
        self.cli = mconnect()
        self._run()
        self.cli.disconnect()

    def _consume_sopt(self):
        """"""
        # TODO: use optparse?
        options = sys.argv
        if len(sys.argv) > 1 and sys.argv[1] in ['-h', '--help']:
            sys.stderr.write(USAGE)
            sys.exit(1)
        try:
            self.tempo = int(options.pop(1))
            self.volum = int(options.pop(1))
        except IndexError:
            pass
        except ValueError, err:
            sys.stderr.write('Error: wrong option passed: %s' % err)
            sys.stdout.write(USAGE)
            sys.exit(1)

    def _run(self):
        """"""
        self.mpd_state = str(self.cli.status().get('state'))
        self.mpd_vol = int(self.cli.status().get('volume'))
        if self.mpd_state == 'play':
            if not self.volum:
                self.volum = self.mpd_vol / 10
            if self.volum > self.mpd_vol:
                sys.stderr.write('Error: specified min volume (%d%%) > to current volume (%d%%)' % (self.volum, self.mpd_vol))
                sys.exit(1)
            print >> sys.stdout, 'fading down from %d%% to %d%% over %smin' % (self.mpd_vol, self.volum, self.tempo)
            if self.fade():
                self.cli.stop()
        if self.mpd_state in ['stop', 'pause']:
            if not self.volum:
                self.volum = int(50)
            print >> sys.stdout, 'fading up from 0%% to %d%% over %smin' % (self.volum, self.tempo)
            self.cli.setvol(0)
            self.mpd_vol = 0
            self.cli.play()
            self.fade()
        sleep(1)

    def fade(self):
        """"""
        # TODO: handle possible lost connections
        span = float(self.volum - self.mpd_vol)
        step = span / float(60 * self.tempo)
        vol = self.mpd_vol
        while 42:
            if int(vol) != int(self.cli.status().get('volume')):
                sys.stderr.write('Warning: external volume change, aborting!\n')
                return False
            vol += step
            self.cli.setvol(int(vol))
            if abs(vol - self.volum) < 1:
                self.cli.setvol(self.volum)
                return True
            sleep(1)


# Script starts here
if __name__ == '__main__':
    try:
        Sleep()
    except KeyboardInterrupt:
        sys.stdout.write('exit')

# VIM MODLINE
# vim: ai ts=4 sw=4 sts=4 expandtab