# Copyright (C) 2008-2010 Adam Olsen
#
# 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 2, 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
#
#
# The developers of the Exaile media player hereby grant permission
# for non-GPL compatible GStreamer and Exaile plugins to be used and
# distributed together with GStreamer and Exaile. This permission is
# above and beyond the permissions granted by the GPL license by which
# Exaile 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 logging
from typing import Dict, Union

from gi.repository import Gtk
from gi.repository import Gdk
from gi.repository import GdkPixbuf
from gi.repository import GObject

from xl import common, event, radio, settings, trax
from xl.nls import gettext as _
from xl.playlist import Playlist, SmartPlaylist
from xlgui import icons, panel
from xlgui.panel import menus
from xlgui.widgets import dialogs
from xlgui.widgets.common import DragTreeView
from xlgui.widgets.smart_playlist_editor import SmartPlaylistEditor

logger = logging.getLogger(__name__)


class TrackWrapper:
    def __init__(self, track, playlist):
        self.track = track
        self.playlist = playlist

    def __str__(self):
        text = self.track.get_tag_raw('title')
        if text is not None:
            text = ' / '.join(text)

        if text:
            artists = self.track.get_tag_raw('artist')
            if artists:
                text += ' - ' + ' / '.join(artists)
            return text
        return self.track.get_loc_for_io()


class BasePlaylistPanelMixin(GObject.Object):
    """
    Base playlist tree object.

    Used by the radio and playlists panels to display playlists
    """

    # HACK: Notice that this is not __gsignals__; descendants need to manually
    # merge this in. This is because new PyGObject doesn't like __gsignals__
    # coming from mixin. See:
    # * https://bugs.launchpad.net/bugs/714484
    # * http://www.daa.com.au/pipermail/pygtk/2011-February/019394.html
    _gsignals_ = {
        'playlist-selected': (GObject.SignalFlags.RUN_LAST, None, (object,)),
        'tracks-selected': (GObject.SignalFlags.RUN_LAST, None, (object,)),
        'append-items': (GObject.SignalFlags.RUN_LAST, None, (object, bool)),
        'replace-items': (GObject.SignalFlags.RUN_LAST, None, (object,)),
        'queue-items': (GObject.SignalFlags.RUN_LAST, None, (object,)),
    }

    # Cache for custom playlists
    playlist_nodes: Dict[Playlist, Gtk.TreeIter]

    # Mapping to keep track of open "are you sure you want to delete" dialogs
    deletion_dialogs: Dict[Union[Playlist, SmartPlaylist], Gtk.Dialog]

    def __init__(self):
        """
        Initializes the mixin
        """
        GObject.Object.__init__(self)
        self.playlist_nodes = {}
        self.track_image = icons.MANAGER.pixbuf_from_icon_name(
            'audio-x-generic', Gtk.IconSize.SMALL_TOOLBAR
        )
        self.deletion_dialogs = {}

    def remove_playlist(self, ignored=None):
        """
        Removes the selected playlist from the UI
        and from the underlying manager
        """
        selected_playlist = self.tree.get_selected_page(raw=True)
        if selected_playlist is None:
            return
        dialog = self.deletion_dialogs.get(selected_playlist)
        if dialog:
            dialog.present()
            return

        def on_response(dialog, response):
            if response == Gtk.ResponseType.YES:
                if isinstance(selected_playlist, SmartPlaylist):
                    self.smart_manager.remove_playlist(selected_playlist.name)
                else:
                    self.playlist_manager.remove_playlist(selected_playlist.name)
                    # Remove from {playlist: iter} cache.
                    del self.playlist_nodes[selected_playlist]
                # Remove from UI.
                selection = self.tree.get_selection()
                (model, iter) = selection.get_selected()
                self.model.remove(iter)
            del self.deletion_dialogs[selected_playlist]
            dialog.destroy()

        dialog = Gtk.MessageDialog(
            buttons=Gtk.ButtonsType.YES_NO,
            message_type=Gtk.MessageType.QUESTION,
            text=_('Delete the playlist "%s"?') % selected_playlist.name,
            transient_for=self.parent,
        )
        dialog.connect('response', on_response)
        self.deletion_dialogs[selected_playlist] = dialog
        dialog.present()

    def rename_playlist(self, playlist):
        """
        Renames the playlist
        """

        if playlist is None:
            return

        # Ask for new name
        dialog = dialogs.TextEntryDialog(
            _("Enter the new name you want for your playlist"),
            _("Rename Playlist"),
            playlist.name,
            parent=self.parent,
        )

        result = dialog.run()
        name = dialog.get_value()

        dialog.destroy()

        if result != Gtk.ResponseType.OK or name == '':
            return

        if name in self.playlist_manager.playlists:
            # name is already in use
            dialogs.error(
                self.parent, _("The playlist name you entered is already in use.")
            )
            return

        selection = self.tree.get_selection()
        (model, iter) = selection.get_selected()
        model.set_value(iter, 1, name)

        # Update the manager as well
        self.playlist_manager.rename_playlist(playlist, name)

    def open_selected_playlist(self):
        selection = self.tree.get_selection()
        (model, iter) = selection.get_selected()
        self.open_item(self.tree, model.get_path(iter), None)

    def on_rating_changed(self, widget, rating):
        """
        Updates the rating of the selected tracks
        """
        tracks = self.get_selected_tracks()

        for track in tracks:
            track.set_rating(rating)

        maximum = settings.get_option('rating/maximum', 5)
        event.log_event('rating_changed', self, 100 * rating / maximum)

    def open_item(self, tree, path, col):
        """
        Called when the user double clicks on a playlist,
        also called when the user double clicks on a track beneath
        a playlist.  When they active a track it opens the playlist
        and starts playing that track
        """
        iter = self.model.get_iter(path)
        item = self.model.get_value(iter, 2)
        if item is not None:
            if isinstance(item, (Playlist, SmartPlaylist)):
                # for smart playlists
                if hasattr(item, 'get_playlist'):
                    try:
                        item = item.get_playlist(self.collection)
                    except Exception as e:
                        logger.exception("Error loading smart playlist")
                        dialogs.error(
                            self.parent, _("Error loading smart playlist: %s") % str(e)
                        )
                        return
                else:
                    # Get an up to date copy
                    item = self.playlist_manager.get_playlist(item.name)
                    # item.set_is_custom(True)

                #                self.controller.main.add_playlist(item)
                self.emit('playlist-selected', item)
            else:
                self.emit('append-items', [item.track], True)

    def add_new_playlist(self, tracks=[], name=None):
        """
        Adds a new playlist to the list of playlists. If name is
        None or the name conflicts with an existing playlist, the
        user will be queried for a new name.

        Returns the name of the new playlist, or None if it was
        not added.
        """
        if name:
            if name in self.playlist_manager.playlists:
                name = dialogs.ask_for_playlist_name(
                    self.get_panel().get_toplevel(), self.playlist_manager, name
                )
        else:
            if tracks:
                artists = []
                composers = []
                albums = []

                for track in tracks:
                    artist = track.get_tag_display('artist', artist_compilations=False)

                    if artist is not None:
                        artists += [artist]

                    composer = track.get_tag_display(
                        'composer', artist_compilations=False
                    )

                    if composer is not None:
                        composers += composer

                    album = track.get_tag_display('album')

                    if album is not None:
                        albums += album

                artists = list(set(artists))[:3]
                composers = list(set(composers))[:3]
                albums = list(set(albums))[:3]

                if len(artists) > 0:
                    name = artists[0]

                    if len(artists) > 2:
                        # TRANSLATORS: Playlist title suggestion with more
                        # than two values
                        name = _('%(first)s, %(second)s and others') % {
                            'first': artists[0],
                            'second': artists[1],
                        }
                    elif len(artists) > 1:
                        # TRANSLATORS: Playlist title suggestion with two values
                        name = _('%(first)s and %(second)s') % {
                            'first': artists[0],
                            'second': artists[1],
                        }
                elif len(composers) > 0:
                    name = composers[0]

                    if len(composers) > 2:
                        # TRANSLATORS: Playlist title suggestion with more
                        # than two values
                        name = _('%(first)s, %(second)s and others') % {
                            'first': composers[0],
                            'second': composers[1],
                        }
                    elif len(composers) > 1:
                        # TRANSLATORS: Playlist title suggestion with two values
                        name = _('%(first)s and %(second)s') % {
                            'first': composers[0],
                            'second': composers[1],
                        }
                elif len(albums) > 0:
                    name = albums[0]

                    if len(albums) > 2:
                        # TRANSLATORS: Playlist title suggestion with more
                        # than two values
                        name = _('%(first)s, %(second)s and others') % {
                            'first': albums[0],
                            'second': albums[1],
                        }
                    elif len(albums) > 1:
                        # TRANSLATORS: Playlist title suggestion with two values
                        name = _('%(first)s and %(second)s') % {
                            'first': albums[0],
                            'second': albums[1],
                        }
                else:
                    name = ''

            name = dialogs.ask_for_playlist_name(
                self.get_panel().get_toplevel(), self.playlist_manager, name
            )

        if name is not None:
            # Create the playlist from all of the tracks
            new_playlist = Playlist(name)
            new_playlist.extend(tracks)
            # We are adding a completely new playlist with tracks so we save it
            self.playlist_manager.save_playlist(new_playlist)

        return name

    def _load_playlist_nodes(self, playlist):
        """
        Loads the playlist tracks into the node for the specified playlist
        """
        if playlist not in self.playlist_nodes:
            return

        expanded = self.tree.row_expanded(
            self.model.get_path(self.playlist_nodes[playlist])
        )

        self._clear_node(self.playlist_nodes[playlist])
        parent = self.playlist_nodes[playlist]
        for track in playlist:
            if not track:
                continue
            wrapper = TrackWrapper(track, playlist)
            row = (self.track_image, str(wrapper), wrapper)
            self.model.append(parent, row)

        if expanded:
            self.tree.expand_row(
                self.model.get_path(self.playlist_nodes[playlist]), False
            )

    def remove_selected_track(self):
        """
        Removes the selected track from its playlist
        and saves the playlist
        """
        selection = self.tree.get_selection()
        (model, iter) = selection.get_selected()
        track = model.get_value(iter, 2)
        if isinstance(track, TrackWrapper):
            del track.playlist[track.playlist.index(track.track)]
            # Update the list
            self.model.remove(iter)
            # TODO do we save the playlist after this??
            self.playlist_manager.save_playlist(track.playlist, overwrite=True)


class PlaylistsPanel(panel.Panel, BasePlaylistPanelMixin):
    """
    The playlists panel
    """

    __gsignals__ = BasePlaylistPanelMixin._gsignals_

    ui_info = ('playlists.ui', 'PlaylistsPanel')

    def __init__(self, parent, playlist_manager, smart_manager, collection, name):
        """
        Initializes the playlists panel

        @param playlist_manager:  The playlist manager
        """
        panel.Panel.__init__(self, parent, name, _('Playlists'))
        BasePlaylistPanelMixin.__init__(self)
        self.playlist_manager = playlist_manager
        self.smart_manager = smart_manager
        self.collection = collection
        self.box = self.builder.get_object('PlaylistsPanel')

        self.playlist_name_info = 500
        self.track_target = Gtk.TargetEntry.new("text/uri-list", 0, 0)
        self.playlist_target = Gtk.TargetEntry.new(
            "playlist_name", Gtk.TargetFlags.SAME_WIDGET, self.playlist_name_info
        )
        self.deny_targets = [Gtk.TargetEntry.new('', 0, 0)]

        self.tree = PlaylistDragTreeView(self)
        self.tree.connect('row-activated', self.open_item)
        self.tree.set_headers_visible(False)
        self.tree.connect('drag-motion', self.drag_motion)
        self.tree.drag_source_set(
            Gdk.ModifierType.BUTTON1_MASK,
            [self.track_target, self.playlist_target],
            Gdk.DragAction.COPY | Gdk.DragAction.MOVE,
        )

        self.scroll = Gtk.ScrolledWindow()
        self.scroll.set_policy(Gtk.PolicyType.AUTOMATIC, Gtk.PolicyType.AUTOMATIC)
        self.scroll.add(self.tree)
        self.scroll.set_shadow_type(Gtk.ShadowType.IN)
        self.box.pack_start(self.scroll, True, True, 0)
        self.box.show_all()

        pb = Gtk.CellRendererPixbuf()
        cell = Gtk.CellRendererText()
        if settings.get_option('gui/ellipsize_text_in_panels', False):
            from gi.repository import Pango

            cell.set_property('ellipsize-set', True)
            cell.set_property('ellipsize', Pango.EllipsizeMode.END)
        col = Gtk.TreeViewColumn('Text')
        col.pack_start(pb, False)
        col.pack_start(cell, True)
        col.set_attributes(pb, pixbuf=0)
        col.set_attributes(cell, text=1)
        self.tree.append_column(col)
        self.model = Gtk.TreeStore(GdkPixbuf.Pixbuf, str, object)
        self.tree.set_model(self.model)

        # icons
        self.folder = icons.MANAGER.pixbuf_from_icon_name(
            'folder', Gtk.IconSize.SMALL_TOOLBAR
        )
        self.playlist_image = icons.MANAGER.pixbuf_from_icon_name(
            'music-library', Gtk.IconSize.SMALL_TOOLBAR
        )

        # menus
        self.playlist_menu = menus.PlaylistsPanelPlaylistMenu(self)
        self.smart_menu = menus.PlaylistsPanelPlaylistMenu(self)
        self.default_menu = menus.PlaylistPanelMenu(self)

        self.track_menu = menus.TrackPanelMenu(self)

        self._connect_events()
        self._load_playlists()

    @property
    def menu(self):
        """
        Gets a menu for the selected item
        :return: xlgui.widgets.menu.Menu or None if do not have it
        """
        model, it = self.tree.get_selection().get_selected()
        pl = model[it][2]
        return (
            self.playlist_menu
            if isinstance(pl, Playlist)
            else (
                self.smart_menu
                if isinstance(pl, SmartPlaylist)
                else (
                    self.track_menu
                    if isinstance(pl, TrackWrapper)
                    else self.default_menu
                )
            )
        )

    def _connect_events(self):
        event.add_ui_callback(self.refresh_playlists, 'track_tags_changed')
        event.add_ui_callback(
            self._on_playlist_added, 'playlist_added', self.playlist_manager
        )

        self.tree.connect('key-release-event', self.on_key_released)

    def _playlist_properties(self):
        pl = self.tree.get_selected_page(raw=True)
        if isinstance(pl, SmartPlaylist):
            self.edit_selected_smart_playlist()

    def refresh_playlists(self, type, track, tags):
        """
        wrapper so that multiple events dont cause multiple
        reloads in quick succession
        """
        if settings.get_option('gui/sync_on_tag_change', True) and tags & {
            'title',
            'artist',
        }:
            self._refresh_playlists()

    @common.glib_wait(500)
    def _refresh_playlists(self):
        """
        Callback for when tags have changed and the playlists
        need refreshing.
        """
        if settings.get_option('gui/sync_on_tag_change', True):
            for playlist in self.playlist_nodes:
                self._load_playlist_nodes(playlist)

    def _on_playlist_added(self, type, object, playlist_name):
        new_playlist = self.playlist_manager.get_playlist(playlist_name)

        for oldpl in self.playlist_nodes:
            if oldpl.name == playlist_name:  # Name already exists
                if oldpl is not new_playlist:
                    node = self.playlist_nodes[oldpl]
                    # Replace the playlist object in {playlist: iter} cache.
                    del self.playlist_nodes[oldpl]
                    self.playlist_nodes[new_playlist] = node
                    # Replace the playlist object in tree model.
                    self.model[node][2] = new_playlist
                break
        else:  # Name doesn't exist yet
            self.playlist_nodes[new_playlist] = self.model.append(
                self.custom, [self.playlist_image, playlist_name, new_playlist]
            )
            self.tree.expand_row(self.model.get_path(self.custom), False)

        # Refresh the playlist subnodes.
        self._load_playlist_nodes(new_playlist)

    def _load_playlists(self):
        """
        Loads the currently saved playlists
        """
        self.smart = self.model.append(None, [self.folder, _("Smart Playlists"), None])

        self.custom = self.model.append(
            None, [self.folder, _("Custom Playlists"), None]
        )

        names = sorted(self.smart_manager.playlists)
        for name in names:
            self.model.append(
                self.smart,
                [self.playlist_image, name, self.smart_manager.get_playlist(name)],
            )

        names = sorted(self.playlist_manager.playlists)
        for name in names:
            playlist = self.playlist_manager.get_playlist(name)
            self.playlist_nodes[playlist] = self.model.append(
                self.custom, [self.playlist_image, name, playlist]
            )
            self._load_playlist_nodes(playlist)

        self.tree.expand_row(self.model.get_path(self.smart), False)
        self.tree.expand_row(self.model.get_path(self.custom), False)

    def import_playlist(self):
        """
        Shows a dialog to ask the user to import a new playlist
        """

        def _on_playlists_selected(dialog, playlists):
            for playlist in playlists:
                self.add_new_playlist(playlist, playlist.name)

        dialog = dialogs.PlaylistImportDialog(parent=self.parent)
        dialog.connect('playlists-selected', _on_playlists_selected)
        dialog.show()

    def add_smart_playlist(self):
        """
        Shows a dialog for adding a new smart playlist
        """
        pl = SmartPlaylistEditor.create(
            self.collection, self.smart_manager, self.parent
        )
        if pl:
            self.model.append(self.smart, [self.playlist_image, pl.name, pl])

    def edit_selected_smart_playlist(self):
        """
        Shows a dialog for editing the currently selected smart playlist
        """
        pl = self.tree.get_selected_page(raw=True)
        self.edit_smart_playlist(pl)

    def edit_smart_playlist(self, pl):
        """
        Shows a dialog for editing a smart playlist
        """
        pl = SmartPlaylistEditor.edit(
            pl, self.collection, self.smart_manager, self.parent
        )
        if pl:
            selection = self.tree.get_selection()
            model, it = selection.get_selected()
            model.set_value(it, 1, pl.name)
            model.set_value(it, 2, pl)

    def drag_data_received(self, tv, context, x, y, selection, info, etime):
        """
        Called when someone drags some thing onto the playlist panel
        """
        if info == self.playlist_name_info:
            # We are being dragged a playlist so
            # we have to reorder them
            playlist_name = selection.get_text()
            drag_source = self.tree.get_selected_page()
            # verify names
            if drag_source is not None:
                if drag_source.name == playlist_name:
                    drop_info = tv.get_dest_row_at_pos(x, y)
                    drag_source_iter = self.playlist_nodes[drag_source]
                    if drop_info:
                        path, position = drop_info
                        drop_target_iter = self.model.get_iter(path)
                        drop_target = self.model.get_value(drop_target_iter, 2)
                        if position == Gtk.TreeViewDropPosition.BEFORE:
                            # Put the playlist before drop_target
                            self.model.move_before(drag_source_iter, drop_target_iter)
                            self.playlist_manager.move(
                                playlist_name, drop_target.name, after=False
                            )
                        else:
                            # put the playlist after drop_target
                            self.model.move_after(drag_source_iter, drop_target_iter)
                            self.playlist_manager.move(
                                playlist_name, drop_target.name, after=True
                            )
            # Even though we are doing a move we still don't
            # call the delete method because we take care
            # of it above by moving instead of inserting/deleting
            context.finish(True, False, etime)
        else:
            self._drag_data_received_uris(tv, context, x, y, selection, info, etime)

    def _drag_data_received_uris(self, tv, context, x, y, selection, info, etime):
        """
        Called by drag_data_received when the user drags URIs onto us
        """
        locs = list(selection.get_uris())
        drop_info = tv.get_dest_row_at_pos(x, y)
        if drop_info:
            path, position = drop_info
            iter = self.model.get_iter(path)
            drop_target = self.model.get_value(iter, 2)

            # if the current item is a track, use the parent playlist
            insert_index = None
            if isinstance(drop_target, TrackWrapper):
                current_playlist = drop_target.playlist
                drop_target_index = current_playlist.index(drop_target.track)
                # Adjust insert position based on drop position
                if (
                    position == Gtk.TreeViewDropPosition.BEFORE
                    or position == Gtk.TreeViewDropPosition.INTO_OR_BEFORE
                ):
                    # By default adding tracks inserts it before so we do not
                    # have to modify the insert index
                    insert_index = drop_target_index
                else:
                    # If we want to go after we have to append 1
                    insert_index = drop_target_index + 1
            else:
                current_playlist = drop_target

            # Since the playlist do not have very good support for
            # duplicate tracks we have to perform some trickery
            # to make this work properly in all cases
            try:
                remove_track_index = current_playlist.index(
                    self.tree.get_selected_track()
                )
            except ValueError:
                remove_track_index = None
            if insert_index is not None and remove_track_index is not None:
                # Since remove_track_index will be removed before
                # the new track is inserted we have to offset the
                # insert index
                if insert_index > remove_track_index:
                    insert_index = insert_index - 1

            # Delete the track before adding the other one
            # so we do not get duplicates
            # right now the playlist does not support
            # duplicate tracks very well
            if context.get_selected_action() == Gdk.DragAction.MOVE:
                # On a move action the second True makes the
                # drag_data_delete function called
                context.finish(True, True, etime)
            else:
                context.finish(True, False, etime)

            # Add the tracks we found to the internal playlist
            # TODO: have it pass in existing tracks?
            (tracks, playlists) = self.tree.get_drag_data(locs)

            if insert_index is not None:
                current_playlist[insert_index:insert_index] = tracks
            else:
                current_playlist.extend(tracks)

            self._load_playlist_nodes(current_playlist)

            # Do we save in the case when a user drags a file onto a playlist
            # in the playlist panel? note that the playlist does not have to
            # be open for this to happen
            self.playlist_manager.save_playlist(current_playlist, overwrite=True)
        else:
            # If the user dragged files prompt for a new playlist name
            # else if they dragged a playlist add the playlist

            # We don't want the tracks in the playlists to be added to the
            # master tracks list so we pass in False
            (tracks, playlists) = self.tree.get_drag_data(locs, False)
            # First see if they dragged any playlist files
            for new_playlist in playlists:
                # We are adding a completely new playlist with tracks so
                # we save it. This will trigger playlist_added.
                self.playlist_manager.save_playlist(new_playlist, overwrite=True)

            # After processing playlist proceed to ask the user for the
            # name of the new playlist to add and add the tracks to it
            if len(tracks) > 0:
                self.add_new_playlist(tracks)

    def drag_data_delete(self, tv, context):
        """
        Called after a drag data operation is complete
        and we want to delete the source data
        """
        if Gdk.drag_drop_succeeded(context):
            self.remove_selected_track()

    def drag_get_data(self, tv, context, selection_data, info, time):
        """
        Called when someone drags something from the playlist
        """
        # TODO based on info determine what we set in selection_data
        if info == self.playlist_name_info:
            pl = self.tree.get_selected_page()
            if pl is not None:
                selection_data.set_text(pl.name, len(pl.name))
        else:
            pl = self.tree.get_selected_page()
            if pl is not None:
                tracks = pl[:]
            else:
                tracks = self.tree.get_selected_tracks()

            if not tracks:
                return

            for track in tracks:
                DragTreeView.dragged_data[track.get_loc_for_io()] = track

            uris = trax.util.get_uris_from_tracks(tracks)
            selection_data.set_uris(uris)

    def drag_motion(self, tv, context, x, y, time):
        """
        Sets the appropriate drag action based on what we are hovering over

        hovering over playlists causes the copy action to occur
        hovering over tracks within the same playlist causes the move
            action to occur
        hovering over tracks within different playlist causes the move
            action to occur

        Called on the destination widget
        """
        # Reset any target to be default to moving tracks
        self.tree.enable_model_drag_dest([self.track_target], Gdk.DragAction.DEFAULT)
        # Determine where the drag is coming from
        dragging_playlist = False
        if tv == self.tree:
            selected_playlist = self.tree.get_selected_page()
            if selected_playlist is not None:
                dragging_playlist = True

        # Find out where they are dropping onto
        drop_info = tv.get_dest_row_at_pos(x, y)
        if drop_info:
            path, position = drop_info
            iter = self.model.get_iter(path)
            drop_target = self.model.get_value(iter, 2)

            if isinstance(drop_target, Playlist):
                if dragging_playlist:
                    # If we drag onto  we copy, if we drag between we move
                    if (
                        position == Gtk.TreeViewDropPosition.INTO_OR_BEFORE
                        or position == Gtk.TreeViewDropPosition.INTO_OR_AFTER
                    ):
                        Gdk.drag_status(context, Gdk.DragAction.COPY, time)
                    else:
                        Gdk.drag_status(context, Gdk.DragAction.MOVE, time)
                        # Change target as well
                        self.tree.enable_model_drag_dest(
                            [self.playlist_target], Gdk.DragAction.DEFAULT
                        )
                else:
                    Gdk.drag_status(context, Gdk.DragAction.COPY, time)
            elif isinstance(drop_target, TrackWrapper):
                # We are dragging onto another track
                # make it a move operation if we are only dragging
                # tracks within our widget
                # We do a copy if we are draggin from another playlist
                if Gtk.drag_get_source_widget(context) == tv and not dragging_playlist:
                    Gdk.drag_status(context, Gdk.DragAction.MOVE, time)
                else:
                    Gdk.drag_status(context, Gdk.DragAction.COPY, time)
            else:
                # Prevent drop operation by changing the targets
                self.tree.enable_model_drag_dest(
                    self.deny_targets, Gdk.DragAction.DEFAULT
                )
                return False
            return True
        else:  # No drop info
            if dragging_playlist:
                Gdk.drag_status(context, Gdk.DragAction.MOVE, time)
                # Change target as well
                self.tree.enable_model_drag_dest(
                    [self.playlist_target], Gdk.DragAction.DEFAULT
                )
                return True
            return False

    def on_key_released(self, widget, event):
        """
        Called when a key is released in the tree
        """
        if event.keyval == Gdk.KEY_Menu:
            (mods, paths) = self.tree.get_selection().get_selected_rows()
            if paths and paths[0]:
                iter = self.model.get_iter(paths[0])
                pl = self.model.get_value(iter, 2)
                # Based on what is selected determines what
                # menu we will show
                if isinstance(pl, Playlist):
                    Gtk.Menu.popup(
                        self.playlist_menu, None, None, None, None, 0, event.time
                    )
                elif isinstance(pl, SmartPlaylist):
                    Gtk.Menu.popup(
                        self.smart_menu, None, None, None, None, 0, event.time
                    )
                elif isinstance(pl, TrackWrapper):
                    Gtk.Menu.popup(
                        self.track_menu, None, None, None, None, 0, event.time
                    )
                else:
                    Gtk.Menu.popup(
                        self.default_menu, None, None, None, None, 0, event.time
                    )
            return True

        if event.keyval == Gdk.KEY_Left:
            (mods, paths) = self.tree.get_selection().get_selected_rows()
            if paths and paths[0]:
                self.tree.collapse_row(paths[0])
            return True

        if event.keyval == Gdk.KEY_Right:
            (mods, paths) = self.tree.get_selection().get_selected_rows()
            if paths and paths[0]:
                self.tree.expand_row(paths[0], False)
            return True

        if event.keyval == Gdk.KEY_Delete:
            (mods, paths) = self.tree.get_selection().get_selected_rows()
            if paths and paths[0]:
                iter = self.model.get_iter(paths[0])
                pl = self.model.get_value(iter, 2)
                # Based on what is selected determines what
                # menu we will show
                if isinstance(pl, (Playlist, SmartPlaylist)):
                    self.remove_playlist(pl)
                elif isinstance(pl, TrackWrapper):
                    self.remove_selected_track()
            return True
        return False

    def _clear_node(self, node):
        """
        Clears a node of all children
        """
        iter = self.model.iter_children(node)
        while True:
            if not iter:
                break
            self.model.remove(iter)
            iter = self.model.iter_children(node)


class PlaylistDragTreeView(DragTreeView):
    """
    Custom DragTreeView to retrieve data from playlists
    """

    def __init__(self, container, receive=True, source=True):
        DragTreeView.__init__(self, container, receive, source)
        self.show_cover_drag_icon = False

    def get_selection_empty(self):
        '''Returns True if there are no selected items'''
        return self.get_selection().count_selected_rows() == 0

    def get_selection_is_computed(self):
        """
        Returns True if selection is a Smart Playlist
        """
        item = self.get_selected_item(raw=True)
        return isinstance(item, SmartPlaylist)

    def get_selected_tracks(self):
        """
        Used by the menu, just basically gets the selected
        playlist and returns the tracks in it
        """
        playlist = self.get_selected_page()

        if playlist is not None:
            return [track for track in playlist]
        else:
            return [self.get_selected_track()]

        return None

    def get_selected_page(self, raw=False):
        """
        Retrieves the currently selected playlist in
        the playlists panel.  If a non-playlist is
        selected it returns None

        @return: the playlist
        """
        item = self.get_selected_item(raw=raw)

        if isinstance(item, (Playlist, SmartPlaylist)):
            return item
        else:
            return None

    def get_selected_track(self):
        item = self.get_selected_item()

        if not item:
            return None

        if isinstance(item, TrackWrapper):
            return item.track
        else:
            return None

    def get_selected_item(self, raw=False):
        (model, iter) = self.get_selection().get_selected()

        if not iter:
            return None

        item = model.get_value(iter, 2)

        # for smart playlists
        if isinstance(item, SmartPlaylist):
            if raw:
                return item
            try:
                return item.get_playlist(self.container.collection)
            except Exception:
                return None
        if isinstance(item, radio.RadioItem):
            if raw:
                return item
            return item.get_playlist()
        elif isinstance(item, Playlist):
            return item
        elif isinstance(item, TrackWrapper):
            return item
        else:
            return None
