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

# Copyright (c) 2009, 2010 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/>.
#
#  }}}


import sys

from time import sleep

from lib.mpdclass import MPDClass
from lib.startop import StartOpt

NAME = 'nalbum'
VERSION = '0.1'

NALBUM_OPTS = list([
    {
        'sw': ['-c', '--crossfade'],
        'type': 'int',
        'dest': 'time',
        'metavar': 't',
        'help': 'fade out/fade in over t seconds.'},
    ])


class Nalbum(StartOpt, MPDClass):
    """
    """
    script_info = dict({
        'version': VERSION,
        'prog_name': NAME,
        'description': 'Jump to next album in playlist.',
        })

    def __init__(self):
        """"""
        StartOpt.__init__(self, self.__class__.script_info, NALBUM_OPTS)
        MPDClass.__init__(self)
        self._run()

    def _fade(self, io='out'):#{{{
        """
        end_volum => End volume value
        mpd_vol   => Start volume value
        """
        mpd_vol = int(self.init_vol)
        if io == 'out':
            end_volum = mpd_vol / 10
            mpd_vol = self.init_vol
        if io == 'in':
            end_volum = int(self.init_vol)
            mpd_vol = int(self.init_vol) / 10
        span = float(end_volum - mpd_vol)
        step = span / float(10*self.cli_options.time)
        while 42:
            mpd_vol += step
            self.client.setvol(int(mpd_vol))
            if abs(mpd_vol - end_volum) < 1:
                self.client.setvol(end_volum)
                return True
            sleep(0.1)#}}}

    def _get_next(self):#{{{
        """Retrieve playlist from current song to the end."""
        if 'song' not in self.client.status():
            print "No current song set in MPD!"
            self.client.disconnect()
            sys.exit(0)
        current_album = str(self.client.currentsong().get('album', 'TAG MISSING'))
        current_song_pos = int(self.client.currentsong().get('pos'))
        print 'Current album: "%s"' % current_album
        next_album_pos = current_song_pos
        album = current_album
        while album == current_album:
            next_album_pos += 1
            pl_length = int(self.client.status().get('playlistlength')) - 1
            if pl_length < next_album_pos:
                print 'Next album not found in the playlitst!'
                self.client.disconnect()
                sys.exit(0)
            album = self.client.playlistinfo(next_album_pos)[0].get('album', 'TAG MISSING')
        print 'Next album appears to be: "%s"' % album
        return next_album_pos#}}}

    def _run(self):
        """"""
        print 'Connecting %s:%i' % (self.cli_options.host, self.cli_options.port)
        self.mpdConnect()
        self.init_vol = int(self.client.status().get('volume'))
        if self.cli_options.time:
            print 'Cross fading next album'
            self._fade()
        self.client.play(self._get_next())
        if self.cli_options.time:
            self._fade(io='in')
        self.client.disconnect()
        sys.exit(0)


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

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