#!/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:
"""

import sys

from os import (access, F_OK, W_OK)
from os.path import (dirname, isfile, join, abspath)

from lib.mpdutils import mconnect

USAGE = """Usage:

mtopls [<path-to-playlist>] [--help | -h | help]

    If no playlist is specifed a new one is created in /var/lib/mpd/playlist/
    named after genre of current playlist.

"""

class MtoPls(object):
    """
    """

    def __init__(self):
        """"""
        self.pls_path = None
        self.cli = mconnect()
        self.current = self.cli.currentsong()
        self.cli.disconnect()
        self._consume_sopt()
        self._create_playlist()
        self._controls_perm()
        self._run()

    def _consume_sopt(self):
        """"""
        if len(sys.argv) > 2 or \
                len(sys.argv) == 2 and \
                sys.argv[1] in ['-h', '--help', 'help']:
            sys.stdout.write(USAGE)
            sys.exit(1)
        if len(sys.argv) == 2:
            self.pls_path = sys.argv[1]
            if not dirname(self.pls_path):
                self.pls_path = abspath(sys.argv[1])
            sys.stdout.write('Playlist set to "%s"\n' % self.pls_path)
            return
        if len(sys.argv) == 1:
            self._set_playlist()
            return
        sys.stdout.write(USAGE)
        sys.exit(1)

    def _set_playlist(self):
        """Set playlist is none is given"""

        mpd_playlists = '/var/lib/mpd/playlists/'
        if not access(mpd_playlists, F_OK):
            sys.stderr.write('Error: No access to "%s"' % self.pls_path)
            sys.exit(1)
        genre = self.current.get('genre', None)
        if not genre:
            sys.stderr.write('Error: No genre set in %s' %
                    self.current.get('file'))
            sys.stdout.write('Please provide a playlist.')
            sys.exit(1)
        genre += '.m3u'
        self.pls_path = join('/var/lib/mpd/playlists/', genre)

    def _create_playlist(self):
        if not isfile(self.pls_path):
            # TODO: add M3U header
            sys.stdout.write('Create new playlist: %s\n' % self.pls_path)
            open(self.pls_path, 'a').close()

    def _controls_perm(self):
        if not access(dirname(self.pls_path), F_OK):
            sys.stderr.write('Error: Not existing path: "%s"' % self.pls_path)
            sys.exit(1)
        if not access(self.pls_path, W_OK):
            sys.stderr.write('Error: No write access to path: "%s"' % self.pls_path)
            sys.exit(1)
        if not isfile(self.pls_path):
            sys.stderr.write('Error: Not a regular file: "%s"' % self.pls_path)
            sys.exit(1)
        return True

    def _run(self):
        """"""
        # TODO: controls file is not already in playlist
        fd = open(self.pls_path, 'a')
        fd.write(self.current.get('file'))
        fd.write('\n')
        fd.close()

# Script starts here
if __name__ == '__main__':
    MtoPls()

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