# Copyright (c) 2013 Vadim Rutkovsky <vrutkovs@redhat.com>
# Copyright (c) 2013 Arnel A. Borja <kyoushuu@yahoo.com>
# Copyright (c) 2013 Seif Lotfy <seif@lotfy.com>
# Copyright (c) 2013 Guillaume Quintard <guillaume.quintard@gmail.com>
#
# GNOME Music 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 2 of the License, or
# (at your option) any later version.
#
# GNOME Music 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 GNOME Music; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# The GNOME Music authors hereby grant permission for non-GPL compatible
# GStreamer plugins to be used and distributed together with GStreamer
# and GNOME Music.  This permission is above and beyond the permissions
# granted by the GPL license by which GNOME Music is covered.  If you
# modify this code, you may extend this exception to your version of the
# code, but you are not obligated to do so.  If you do not wish to do so,
# delete this exception statement from your version.

import gi
gi.require_version('Grl', '0.3')
from gi.repository import GLib, GObject
from gnomemusic.query import Query
from gnomemusic import log, TrackerWrapper
import logging
import os
os.environ['GRL_PLUGIN_RANKS'] = ("grl-local-metadata:5,"
                                  "grl-filesystem:4,"
                                  "grl-tracker-source:3,"
                                  "grl-lastfm-cover:2,"
                                  "grl-theaudiodb-cover:1")
from gi.repository import Grl
logger = logging.getLogger(__name__)


class Grilo(GObject.GObject):

    __gtype_name__ = 'Grilo'

    __gsignals__ = {
        'ready': (GObject.SignalFlags.RUN_FIRST, None, ()),
        'changes-pending': (GObject.SignalFlags.RUN_FIRST, None, ()),
        'new-source-added': (GObject.SignalFlags.RUN_FIRST, None, (Grl.Source, ))
    }

    METADATA_KEYS = [
        Grl.METADATA_KEY_ALBUM,
        Grl.METADATA_KEY_ALBUM_ARTIST,
        Grl.METADATA_KEY_ALBUM_DISC_NUMBER,
        Grl.METADATA_KEY_ARTIST,
        Grl.METADATA_KEY_CREATION_DATE,
        Grl.METADATA_KEY_COMPOSER,
        Grl.METADATA_KEY_DURATION,
        Grl.METADATA_KEY_FAVOURITE,
        Grl.METADATA_KEY_ID,
        Grl.METADATA_KEY_LYRICS,
        Grl.METADATA_KEY_PLAY_COUNT,
        Grl.METADATA_KEY_THUMBNAIL,
        Grl.METADATA_KEY_TITLE,
        Grl.METADATA_KEY_TRACK_NUMBER,
        Grl.METADATA_KEY_URL
    ]

    METADATA_THUMBNAIL_KEYS = [
        Grl.METADATA_KEY_ID,
        Grl.METADATA_KEY_THUMBNAIL,
    ]

    CHANGED_MEDIA_MAX_ITEMS = 500
    CHANGED_MEDIA_SIGNAL_TIMEOUT = 2000

    _theaudiodb_api_key = "195003"

    sources = GObject.Property()
    cover_sources = GObject.Property(type=bool, default=False)

    def __repr__(self):
        return '<Grilo>'

    @log
    def __init__(self):
        super().__init__()

        self.playlist_path = GLib.build_filenamev([GLib.get_user_data_dir(),
                                                  "gnome-music", "playlists"])
        if not (GLib.file_test(self.playlist_path, GLib.FileTest.IS_DIR)):
            GLib.mkdir_with_parents(self.playlist_path, int("0755", 8))

        Grl.init(None)
        self.options = Grl.OperationOptions()
        self.options.set_resolution_flags(Grl.ResolutionFlags.FAST_ONLY |
                                          Grl.ResolutionFlags.IDLE_RELAY)

        self.full_options = Grl.OperationOptions()
        self.full_options.set_resolution_flags(Grl.ResolutionFlags.FULL |
                                               Grl.ResolutionFlags.IDLE_RELAY)

        self.props.sources = {}

        self.blacklist = [
            'grl-filesystem',
            'grl-bookmarks',
            'grl-metadata-store',
            'grl-podcasts',
            'grl-spotify-cover'
        ]
        self.tracker = None
        self.changed_media_ids = []
        self.pending_event_id = 0
        self.changes_pending = {'Albums': False, 'Artists': False, 'Songs': False}
        self.pending_changed_medias = []

        self._thumbnail_sources = []
        self._thumbnail_sources_timeout = None

        self.registry = Grl.Registry.get_default()

        self.sparqltracker = TrackerWrapper().tracker

        self._find_sources()

    @log
    def _find_sources(self):
        config = Grl.Config.new('grl-lua-factory', 'grl-theaudiodb-cover')
        config.set_api_key(self._theaudiodb_api_key)
        self.registry.add_config(config)

        self.registry.connect('source_added', self._on_source_added)
        self.registry.connect('source_removed', self._on_source_removed)

        try:
            self.registry.load_all_plugins(True)
        except GLib.GError:
            logger.error('Failed to load plugins.')
        if self.tracker is not None:
            logger.debug("tracker found")

    @log
    def _rate_limited_content_changed(self, mediaSource, changedMedias, changeType, locationUnknown):
        [self.pending_changed_medias.append(media) for media in changedMedias]
        if self.content_changed_timeout is None:
            self.content_changed_timeout = GLib.timeout_add(
                500, self._on_content_changed, mediaSource, self.pending_changed_medias, changeType, locationUnknown)

    @log
    def _on_content_changed(self, mediaSource, changedMedias, changeType, locationUnknown):
        try:
            with self.tracker.handler_block(self.notification_handler):
                for media in changedMedias:
                    media_id = media.get_id()
                    if (changeType == Grl.SourceChangeType.ADDED
                            and media.is_audio()):
                        self.changed_media_ids.append(media_id)
                    if changeType == Grl.SourceChangeType.REMOVED:
                        # There is no way to check that removed item is a media
                        # so always do the refresh
                        # todo: remove one single url
                        try:
                            self.changed_media_ids.append(media.get_id())
                        except Exception:
                            logger.warning("Skipping {}".format(media))

                if self.changed_media_ids == []:
                    self.pending_changed_medias = []
                    if self.content_changed_timeout is not None:
                        GLib.source_remove(self.content_changed_timeout)
                        self.content_changed_timeout = None
                    return False

                self.changed_media_ids = list(set(self.changed_media_ids))
                logger.debug("Changed medias: %s", self.changed_media_ids)

                if len(self.changed_media_ids) >= self.CHANGED_MEDIA_MAX_ITEMS:
                    self.emit_change_signal()
                elif self.changed_media_ids != []:
                    if self.pending_event_id > 0:
                        GLib.Source.remove(self.pending_event_id)
                        self.pending_event_id = 0
                    self.pending_event_id = GLib.timeout_add(self.CHANGED_MEDIA_SIGNAL_TIMEOUT, self.emit_change_signal)
        except Exception as error:
            logger.warning(
                "Exception in _on_content_changed: {}".format(error))
        finally:
            self.pending_changed_medias = []
            if self.content_changed_timeout is not None:
                GLib.source_remove(self.content_changed_timeout)
                self.content_changed_timeout = None
            return False

    @log
    def emit_change_signal(self):
        self.changed_media_ids = []
        self.pending_event_id = 0
        self.changes_pending['Albums'] = True
        self.changes_pending['Artists'] = True
        self.changes_pending['Songs'] = True
        self.emit('changes-pending')
        return False

    @log
    def _trigger_art_update(self):
        self._thumbnail_sources_timeout = None
        if len(self._thumbnail_sources) > 0:
            self.props.cover_sources = True

        return GLib.SOURCE_REMOVE

    @log
    def _on_source_added(self, pluginRegistry, mediaSource):
        if ("net:plaintext" in mediaSource.get_tags()
                or mediaSource.get_id() in self.blacklist):
            try:
                pluginRegistry.unregister_source(mediaSource)
            except GLib.GError:
                logger.error(
                    "Failed to unregister {}".format(mediaSource.get_id()))
            return

        if Grl.METADATA_KEY_THUMBNAIL in mediaSource.supported_keys():
            self._thumbnail_sources.append(mediaSource)
            if not self._thumbnail_sources_timeout:
                # Aggregate sources being added, for example when the
                # network comes online.
                self._thumbnail_sources_timeout = GLib.timeout_add_seconds(
                    5, self._trigger_art_update)

        id = mediaSource.get_id()
        logger.debug("new grilo source %s was added", id)
        try:
            ops = mediaSource.supported_operations()

            if id == 'grl-tracker-source':
                if ops & Grl.SupportedOps.SEARCH:
                    logger.debug("found searchable tracker source")
                    self.props.sources[id] = mediaSource
                    self.tracker = mediaSource
                    self.search_source = mediaSource

                    if self.tracker is not None:
                        self.emit('ready')
                        self.tracker.notify_change_start()
                        self.content_changed_timeout = None
                        self.notification_handler = self.tracker.connect(
                            'content-changed', self._rate_limited_content_changed)

            elif (id.startswith('grl-upnp')):
                logger.debug("found upnp source %s", id)
                self.props.sources[id] = mediaSource
                self.emit('new-source-added', mediaSource)

            elif (ops & Grl.SupportedOps.SEARCH
                  and mediaSource.get_supported_media() & Grl.MediaType.AUDIO):
                logger.debug("source %s is searchable", id)
                self.props.sources[id] = mediaSource
                self.emit('new-source-added', mediaSource)

        except Exception as e:
            logger.debug("Source {}: exception {}".format(id, e))

    @log
    def _on_source_removed(self, pluginRegistry, mediaSource):
        pass

    @log
    def populate_artists(self, offset, callback, count=-1):
        self.populate_items(Query.all_artists(), offset, callback, count)

    @log
    def populate_albums(self, offset, callback, count=-1):
        self.populate_items(Query.all_albums(), offset, callback, count)

    @log
    def populate_songs(self, offset, callback, count=-1):
        self.populate_items(Query.all_songs(), offset, callback, count)

    @log
    def populate_playlists(self, offset, callback, count=-1):
        """Asynchronously get playlists (user and smart ones)

        :param int offset: start index
        :param function callback: callback function
        :param int count: limit number of results
        """
        self.populate_items(Query.all_playlists(), offset, callback, count)

    @log
    def populate_user_playlists(self, offset, callback, count=-1):
        """Asynchronously get user playlists

        :param int offset: start index
        :param function callback: callback function
        :param int count: limit number of results
        """
        self.populate_items(
            Query.all_user_playlists(), offset, callback, count)

    @log
    def populate_album_songs(self, album, callback, count=-1):
        if album.get_source() == 'grl-tracker-source':
            self.populate_items(
                Query.album_songs(album.get_id()), 0, callback, count)
        else:
            source = self.props.sources[album.get_source()]
            length = len(album.songs)
            for i, track in enumerate(album.songs):
                callback(source, None, track, length - (i + 1), None)
            callback(source, None, None, 0, None)

    @log
    def populate_playlist_songs(self, playlist, callback, count=-1):
        self.populate_items(
            Query.playlist_songs(playlist.get_id()), 0, callback, count)

    @log
    def populate_custom_query(self, query, callback, count=-1, data=None):
        self.populate_items(query, 0, callback, count, data)

    @log
    def populate_items(self, query, offset, callback, count=-1, data=None):
        options = self.options.copy()
        options.set_skip(offset)
        if count != -1:
            options.set_count(count)

        def _callback(source, param, item, remaining, data, error):
            if error:
                logger.warning(
                    "Error {}: {}".format(error.domain, error.message))
            callback(source, param, item, remaining, data)
        self.tracker.query(query, self.METADATA_KEYS, options, _callback, data)

    @log
    def toggle_favorite(self, song_item):
        """Toggles favorite status for media item

        Toggles favorite status and writes it back to the tracker store
        :param song_item: A Grilo media item
        """
        if song_item.get_favourite():
            # For now keep unsetting the lyrics to deal with how
            # previous versions dealt with favorites.
            song_item.set_lyrics("")
            song_item.set_favourite(False)
        else:
            song_item.set_favourite(True)

        # FIXME: We assume this is the tracker plugin.
        # FIXME: Doing this async crashes
        try:
            self.tracker.store_metadata_sync(
                song_item, [Grl.METADATA_KEY_FAVOURITE], Grl.WriteFlags.NORMAL)
        except GLib.Error as error:
            logger.warning("Error {}: {}".format(error.domain, error.message))

    @log
    def set_favorite(self, song_item, favorite):
        """Set the favorite status of a media item

        :param song_item: A Grilo media item
        :param bool favorite: Set favorite status
        """
        if song_item.get_favourite() != favorite:
            self.toggle_favorite(song_item)

    @log
    def search(self, q, callback, data=None):
        options = self.options.copy()
        self._search_callback_counter = 0

        @log
        def _search_callback(source, param, item, remaining, data, error):
            if error:
                logger.warning(
                    "Error {}: {}".format(error.domain, error.message))
            callback(source, param, item, remaining, data)
            self._search_callback_counter += 1

        @log
        def _multiple_search_callback(source, param, item, remaining, data, error):
            if error:
                logger.warning(
                    "Error {}: {}".format(error.domain, error.message))
            callback(source, param, item, remaining, data)

        if self.search_source:
            if self.search_source.get_id().startswith('grl-upnp'):
                options.set_type_filter(Grl.TypeFilter.AUDIO)
            self.search_source.search(q, self.METADATA_KEYS, options,
                                      _search_callback, data)
        else:
            Grl.multiple_search(
                [self.props.sources[key] for key in self.props.sources
                 if key != 'grl-tracker-source'], q,
                 self.METADATA_KEYS, options, _multiple_search_callback, data)

    @log
    def get_album_art_for_item(self, item, callback):
        # Tracker not (yet) loaded.
        if self.search_source is None:
            return

        item_id = item.get_id()

        if item.is_audio():
            query = Query.get_album_for_song_id(item_id)
        else:
            query = Query.get_album_for_album_id(item_id)

        options = self.full_options.copy()
        options.set_count(1)

        self.search_source.query(query, self.METADATA_THUMBNAIL_KEYS, options,
                                 callback)

    @log
    def get_playlist_with_id(self, playlist_id, callback):
        options = self.options.copy()
        query = Query.get_playlist_with_id(playlist_id)

        self.tracker.query(query, self.METADATA_KEYS, options, callback, None)

    @log
    def get_playlist_song_with_id(self, playlist_id, entry_id, callback):
        options = self.options.copy()
        query = Query.get_playlist_song_with_id(playlist_id, entry_id)

        self.tracker.query(query, self.METADATA_KEYS, options, callback, None)

    @log
    def bump_play_count(self, media):
        """Bumps the play count of a song

        Adds one to the playcount and adds it to the tracker store
        :param media: A Grilo media item
        """
        count = media.get_play_count()
        media.set_play_count(count + 1)

        # FIXME: We assume this is the tracker plugin.
        # FIXME: Doing this async crashes
        try:
            self.tracker.store_metadata_sync(
                media, [Grl.METADATA_KEY_PLAY_COUNT], Grl.WriteFlags.NORMAL)
        except GLib.Error as error:
            logger.warning("Error {}: {}".format(error.domain, error.message))

    @log
    def set_last_played(self, media):
        """Sets the date-time when the media was last played

        Sets the last played date-time for the media.
        :param media: A Grilo media item
        """
        media.set_last_played(GLib.DateTime.new_now_utc())
        # FIXME: We assume this is the tracker plugin.
        # FIXME: Doing this async crashes
        try:
            self.tracker.store_metadata_sync(
                media, [Grl.METADATA_KEY_LAST_PLAYED], Grl.WriteFlags.NORMAL)
        except GLib.Error as error:
            logger.warning("Error {}: {}".format(error.domain, error.message))

    @log
    def songs_available(self, callback):
        """Checks if there are any songs available

        Calls a callback function with True or False depending on the
        availability of songs.
        :param callback: Function to call on result
        """
        def cursor_next_cb(conn, res, data):
            try:
                has_next = conn.next_finish(res)
            except GLib.Error as err:
                logger.warning("Error: {}, {}".format(err.__class__, err))
                callback(False)
                return

            if has_next:
                count = conn.get_integer(0)

                if count > 0:
                    callback(True)
                    return

            callback(False)

        def songs_query_cb(conn, res, data):
            try:
                cursor = conn.query_finish(res)
            except GLib.Error as err:
                logger.warning("Error: {}, {}".format(err.__class__, err))
                callback(False)
                return

            cursor.next_async(None, cursor_next_cb, None)

        # TODO: currently just checks tracker, should work with any
        # queryable supported Grilo source.
        self.sparqltracker.query_async(Query.all_songs_count(), None,
                                       songs_query_cb, None)


grilo = Grilo()
