from __future__ import unicode_literals

import datetime as dt

from mopidy.mpd.exceptions import MpdNoExistError, MpdNotImplemented
from mopidy.mpd.protocol import handle_request
from mopidy.mpd.translator import playlist_to_mpd_format


@handle_request(r'listplaylist\ ("?)(?P<name>[^"]+)\1$')
def listplaylist(context, name):
    """
    *musicpd.org, stored playlists section:*

        ``listplaylist {NAME}``

        Lists the files in the playlist ``NAME.m3u``.

    Output format::

        file: relative/path/to/file1.flac
        file: relative/path/to/file2.ogg
        file: relative/path/to/file3.mp3
    """
    playlist = context.lookup_playlist_from_name(name)
    if not playlist:
        raise MpdNoExistError('No such playlist')
    return ['file: %s' % t.uri for t in playlist.tracks]


@handle_request(r'listplaylistinfo\ ("?)(?P<name>[^"]+)\1$')
def listplaylistinfo(context, name):
    """
    *musicpd.org, stored playlists section:*

        ``listplaylistinfo {NAME}``

        Lists songs in the playlist ``NAME.m3u``.

    Output format:

        Standard track listing, with fields: file, Time, Title, Date,
        Album, Artist, Track
    """
    playlist = context.lookup_playlist_from_name(name)
    if not playlist:
        raise MpdNoExistError('No such playlist')
    return playlist_to_mpd_format(playlist)


@handle_request(r'listplaylists$')
def listplaylists(context):
    """
    *musicpd.org, stored playlists section:*

        ``listplaylists``

        Prints a list of the playlist directory.

        After each playlist name the server sends its last modification
        time as attribute ``Last-Modified`` in ISO 8601 format. To avoid
        problems due to clock differences between clients and the server,
        clients should not compare this value with their local clock.

    Output format::

        playlist: a
        Last-Modified: 2010-02-06T02:10:25Z
        playlist: b
        Last-Modified: 2010-02-06T02:11:08Z

    *Clarifications:*

    - ncmpcpp 0.5.10 segfaults if we return 'playlist: ' on a line, so we must
      ignore playlists without names, which isn't very useful anyway.
    """
    result = []
    for playlist in context.core.playlists.playlists.get():
        if not playlist.name:
            continue
        name = context.lookup_playlist_name_from_uri(playlist.uri)
        result.append(('playlist', name))
        last_modified = (
            playlist.last_modified or dt.datetime.utcnow()).isoformat()
        # Remove microseconds
        last_modified = last_modified.split('.')[0]
        # Add time zone information
        last_modified = last_modified + 'Z'
        result.append(('Last-Modified', last_modified))
    return result


@handle_request(
    r'load\ "(?P<name>[^"]+)"(\ "(?P<start>\d+):(?P<end>\d+)*")*$')
def load(context, name, start=None, end=None):
    """
    *musicpd.org, stored playlists section:*

        ``load {NAME} [START:END]``

        Loads the playlist into the current queue. Playlist plugins are
        supported. A range may be specified to load only a part of the
        playlist.

    *Clarifications:*

    - ``load`` appends the given playlist to the current playlist.

    - MPD 0.17.1 does not support open-ended ranges, i.e. without end
      specified, for the ``load`` command, even though MPD's general range docs
      allows open-ended ranges.

    - MPD 0.17.1 does not fail if the specified range is outside the playlist,
      in either or both ends.
    """
    playlist = context.lookup_playlist_from_name(name)
    if not playlist:
        raise MpdNoExistError('No such playlist')
    if start is not None:
        start = int(start)
    if end is not None:
        end = int(end)
    context.core.tracklist.add(playlist.tracks[start:end])


@handle_request(r'playlistadd\ "(?P<name>[^"]+)"\ "(?P<uri>[^"]+)"$')
def playlistadd(context, name, uri):
    """
    *musicpd.org, stored playlists section:*

        ``playlistadd {NAME} {URI}``

        Adds ``URI`` to the playlist ``NAME.m3u``.

        ``NAME.m3u`` will be created if it does not exist.
    """
    raise MpdNotImplemented  # TODO


@handle_request(r'playlistclear\ "(?P<name>[^"]+)"$')
def playlistclear(context, name):
    """
    *musicpd.org, stored playlists section:*

        ``playlistclear {NAME}``

        Clears the playlist ``NAME.m3u``.
    """
    raise MpdNotImplemented  # TODO


@handle_request(r'playlistdelete\ "(?P<name>[^"]+)"\ "(?P<songpos>\d+)"$')
def playlistdelete(context, name, songpos):
    """
    *musicpd.org, stored playlists section:*

        ``playlistdelete {NAME} {SONGPOS}``

        Deletes ``SONGPOS`` from the playlist ``NAME.m3u``.
    """
    raise MpdNotImplemented  # TODO


@handle_request(
    r'playlistmove\ "(?P<name>[^"]+)"\ '
    r'"(?P<from_pos>\d+)"\ "(?P<to_pos>\d+)"$')
def playlistmove(context, name, from_pos, to_pos):
    """
    *musicpd.org, stored playlists section:*

        ``playlistmove {NAME} {SONGID} {SONGPOS}``

        Moves ``SONGID`` in the playlist ``NAME.m3u`` to the position
        ``SONGPOS``.

    *Clarifications:*

    - The second argument is not a ``SONGID`` as used elsewhere in the protocol
      documentation, but just the ``SONGPOS`` to move *from*, i.e.
      ``playlistmove {NAME} {FROM_SONGPOS} {TO_SONGPOS}``.
    """
    raise MpdNotImplemented  # TODO


@handle_request(r'rename\ "(?P<old_name>[^"]+)"\ "(?P<new_name>[^"]+)"$')
def rename(context, old_name, new_name):
    """
    *musicpd.org, stored playlists section:*

        ``rename {NAME} {NEW_NAME}``

        Renames the playlist ``NAME.m3u`` to ``NEW_NAME.m3u``.
    """
    raise MpdNotImplemented  # TODO


@handle_request(r'rm\ "(?P<name>[^"]+)"$')
def rm(context, name):
    """
    *musicpd.org, stored playlists section:*

        ``rm {NAME}``

        Removes the playlist ``NAME.m3u`` from the playlist directory.
    """
    raise MpdNotImplemented  # TODO


@handle_request(r'save\ "(?P<name>[^"]+)"$')
def save(context, name):
    """
    *musicpd.org, stored playlists section:*

        ``save {NAME}``

        Saves the current playlist to ``NAME.m3u`` in the playlist
        directory.
    """
    raise MpdNotImplemented  # TODO
