# This file is part of beets.
# Copyright 2014, David Hamp-Gonsalves
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.

"""Send the results of a query to the configured music player as a playlist.
"""
from beets.plugins import BeetsPlugin
from beets.ui import Subcommand
from beets import config
from beets import ui
from beets import util
from os.path import relpath
import platform
import logging
import shlex
from tempfile import NamedTemporaryFile

log = logging.getLogger('beets')


def play_music(lib, opts, args):
    """Execute query, create temporary playlist and execute player
    command passing that playlist.
    """
    command_str = config['play']['command'].get()
    use_folders = config['play']['use_folders'].get(bool)
    relative_to = config['play']['relative_to'].get()
    if relative_to:
        relative_to = util.normpath(relative_to)
    if command_str:
        command = shlex.split(command_str)
    else:
        # If a command isn't set, then let the OS decide how to open the
        # playlist.
        sys_name = platform.system()
        if sys_name == 'Darwin':
            command = ['open']
        elif sys_name == 'Windows':
            command = ['start']
        else:
            # If not Mac or Windows, then assume Unixy.
            command = ['xdg-open']

    # Preform search by album and add folders rather then tracks to playlist.
    if opts.album:
        selection = lib.albums(ui.decargs(args))
        paths = []

        for album in selection:
            if use_folders:
                paths.append(album.item_dir())
            else:
                # TODO use core's sorting functionality
                paths.extend([item.path for item in sorted(
                    album.items(), key=lambda item: (item.disc, item.track))])
        item_type = 'album'

    # Preform item query and add tracks to playlist.
    else:
        selection = lib.items(ui.decargs(args))
        paths = [item.path for item in selection]
        item_type = 'track'

    item_type += 's' if len(selection) > 1 else ''

    if not selection:
        ui.print_(ui.colorize('yellow', 'No {0} to play.'.format(item_type)))
        return

    # Warn user before playing any huge playlists.
    if len(selection) > 100:
        ui.print_(ui.colorize(
            'yellow',
            'You are about to queue {0} {1}.'.format(len(selection), item_type)
        ))

        if ui.input_options(('Continue', 'Abort')) == 'a':
            return

    # Create temporary m3u file to hold our playlist.
    m3u = NamedTemporaryFile('w', suffix='.m3u', delete=False)
    for item in paths:
        if relative_to:
            m3u.write(relpath(item, relative_to) + '\n')
        else:
            m3u.write(item + '\n')
    m3u.close()

    command.append(m3u.name)

    # Invoke the command and log the output.
    output = util.command_output(command)
    if output:
        log.debug(u'Output of {0}: {1}'.format(
            util.displayable_path(command[0]),
            output.decode('utf8', 'ignore'),
        ))
    else:
        log.debug(u'play: no output')

    ui.print_(u'Playing {0} {1}.'.format(len(selection), item_type))

    util.remove(m3u.name)


class PlayPlugin(BeetsPlugin):

    def __init__(self):
        super(PlayPlugin, self).__init__()

        config['play'].add({
            'command': None,
            'use_folders': False,
            'relative_to': None,
        })

    def commands(self):
        play_command = Subcommand(
            'play',
            help='send music to a player as a playlist'
        )
        play_command.parser.add_option(
            '-a', '--album',
            action='store_true', default=False,
            help='query and load albums rather than tracks'
        )
        play_command.func = play_music
        return [play_command]