# -*- coding: utf-8 -*-
# Copyright 2006 Joe Wreschnig
#      2013-2018 Nick Boultbee
#
# 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 of the License, or
# (at your option) any later version.

from gi.repository import Gtk

from quodlibet.plugins.gui import MenuItemPlugin
from quodlibet.plugins.songshelpers import is_a_file
from quodlibet.qltk.pluginwin import PluginWindow

from quodlibet import ngettext, _, print_d
from quodlibet import qltk
from quodlibet.errorreport import errorhook
from quodlibet.qltk.showfiles import show_songs

from quodlibet.util import print_e, print_w
from quodlibet.qltk.msg import ConfirmationPrompt, ErrorMessage
from quodlibet.qltk.delete import TrashMenuItem, trash_songs
from quodlibet.qltk.information import Information
from quodlibet.qltk.properties import SongProperties
from quodlibet.qltk.x import SeparatorMenuItem
from quodlibet.qltk.ratingsmenu import RatingsMenuItem
from quodlibet.qltk import get_top_parent, get_menu_item_top_parent, Icons
from quodlibet.plugins import PluginManager, PluginHandler
from quodlibet.plugins.songsmenu import SongsMenuPlugin
from quodlibet.util.songwrapper import ListWrapper, check_wrapper_changed


def confirm_song_removal_invoke(parent, songs):
    songs = set(songs)
    if not songs:
        return True

    count = len(songs)
    song = next(iter(songs))
    title = (ngettext("Remove track: \"%%(title)s\" from library?",
                     "Remove %(count)d tracks from library?",
                     count) % {'count': count}) % {
                        'title': song('title') or song('~basename')}

    return ConfirmationPrompt.RESPONSE_INVOKE == ConfirmationPrompt(
               parent, title, "", _("Remove from Library")).run()


def confirm_multi_song_invoke(parent, plugin_name, count):
    """Dialog to confirm invoking a plugin with X songs in case X is high"""
    title = ngettext("Run the plugin \"%(name)s\" on %(count)d song?",
                     "Run the plugin \"%(name)s\" on %(count)d songs?",
                     count) % {"name": plugin_name, "count": count}
    description = ""
    ok_text = _("_Run Plugin")
    prompt = ConfirmationPrompt(parent, title, description, ok_text).run()
    return prompt == ConfirmationPrompt.RESPONSE_INVOKE


def confirm_multi_album_invoke(parent, plugin_name, count):
    """Dialog to confirm invoking a plugin with X albums in case X is high"""
    title = ngettext("Run the plugin \"%(name)s\" on %(count)d album?",
                     "Run the plugin \"%(name)s\" on %(count)d albums?",
                     count) % {"name": plugin_name, "count": count}
    description = ""
    ok_text = _("_Run Plugin")
    prompt = ConfirmationPrompt(parent, title, description, ok_text).run()
    return prompt == ConfirmationPrompt.RESPONSE_INVOKE


class SongsMenuPluginHandler(PluginHandler):

    def __init__(self, song_confirmer=None, album_confirmer=None):
        """custom confirmers for testing"""

        self.__plugins = []

        self._confirm_multiple_songs = confirm_multi_song_invoke
        if song_confirmer is not None:
            self._confirm_multiple_songs = song_confirmer

        self._confirm_multiple_albums = confirm_multi_album_invoke
        if album_confirmer is not None:
            self._confirm_multiple_albums = album_confirmer

    def Menu(self, library, songs):
        songs = ListWrapper(songs)

        attrs = ['plugin_song', 'plugin_songs',
                 'plugin_album', 'plugin_albums']

        if len(songs) == 1:
            attrs.append('plugin_single_song')

        last = (songs and songs[-1]) or None
        for song in songs:
            if song.album_key != last.album_key:
                break
            last = song
        else:
            attrs.append('plugin_single_album')

        items = []
        kinds = self.__plugins
        kinds.sort(key=lambda plugin: plugin.PLUGIN_ID)
        for Kind in kinds:
            usable = any(callable(getattr(Kind, s)) for s in attrs)
            if usable:
                try:
                    items.append(Kind(songs, library))
                except:
                    print_e("Couldn't initialise song plugin %s. Stack trace:"
                            % Kind)
                    errorhook()
        items = [i for i in items if i.initialized]

        if items:
            menu = Gtk.Menu()
            for item in items:
                try:
                    menu.append(item)
                    args = (library, songs)
                    if item.get_submenu():
                        for subitem in item.get_submenu().get_children():
                            subitem.connect(
                                'activate', self.__on_activate, item, *args)
                    else:
                        item.connect(
                            'activate', self.__on_activate, item, *args)
                except:
                    errorhook()
                    item.destroy()
            menu.append(SeparatorMenuItem())
            prefs = Gtk.MenuItem(label=_("Configure Plugins…"))
            prefs.connect("activate", lambda _: PluginWindow().show())
            menu.append(prefs)

        else:
            menu = None
        return menu

    def __get_albums(self, songs):
        albums = {}
        for song in songs:
            key = song.album_key
            if key not in albums:
                albums[key] = []
            albums[key].append(song)

        albums = list(albums.values())
        for album in albums:
            album.sort()
        return albums

    def handle(self, plugin_id, library, parent, songs):
        """Start a song menu plugin directly without a menu"""

        parent = get_top_parent(parent)

        for plugin in self.__plugins:
            if plugin.PLUGIN_ID == plugin_id:
                songs = ListWrapper(songs)
                try:
                    plugin = plugin(songs, library)
                except Exception:
                    errorhook()
                else:
                    self.__handle(plugin, plugin, library, songs, parent)
                return

    def __on_activate(self, item, plugin, library, songs):
        parent = get_menu_item_top_parent(item)
        self.__handle(item, plugin, library, songs, parent)

    def __handle(self, item, plugin, library, songs, parent):
        if len(songs) == 0:
            return

        try:
            if len(songs) == 1 and callable(plugin.plugin_single_song):
                try:
                    ret = plugin.plugin_single_song(songs[0])
                except Exception:
                    errorhook()
                else:
                    if ret:
                        return
            if callable(plugin.plugin_song):
                total = len(songs)
                if total > plugin.MAX_INVOCATIONS:
                    if not self._confirm_multiple_songs(
                            parent, plugin.PLUGIN_NAME, total):
                        return

                try:
                    ret = map(plugin.plugin_song, songs)
                except Exception:
                    errorhook()
                else:
                    if any(ret):
                        return
            if callable(plugin.plugin_songs):
                try:
                    ret = plugin.plugin_songs(songs)
                except Exception:
                    errorhook()
                else:
                    if ret:
                        return

            if plugin.handles_albums:
                albums = self.__get_albums(songs)
                total = len(albums)
                if total > plugin.MAX_INVOCATIONS:
                    if not self._confirm_multiple_albums(
                            parent, plugin.PLUGIN_NAME, total):
                        return

            if callable(plugin.plugin_single_album) and len(albums) == 1:
                try:
                    ret = plugin.plugin_single_album(albums[0])
                except Exception:
                    errorhook()
                else:
                    if ret:
                        return
            if callable(plugin.plugin_album):
                try:
                    ret = map(plugin.plugin_album, albums)
                except Exception:
                    errorhook()
                else:
                    if any(ret):
                        return
            if callable(plugin.plugin_albums):
                try:
                    ret = plugin.plugin_albums(albums)
                except Exception:
                    errorhook()
                else:
                    if ret:
                        return

        finally:
            check_wrapper_changed(library, parent, filter(None, songs))

    def plugin_handle(self, plugin):
        return issubclass(plugin.cls, SongsMenuPlugin)

    def plugin_enable(self, plugin):
        self.__plugins.append(plugin.cls)

    def plugin_disable(self, plugin):
        self.__plugins.remove(plugin.cls)


class SongsMenu(Gtk.Menu):
    plugins = SongsMenuPluginHandler()

    @classmethod
    def init_plugins(cls):
        PluginManager.instance.register_handler(cls.plugins)

    def __init__(self, library, songs, plugins=True, playlists=True,
                 queue=True, remove=True, delete=False, edit=True,
                 ratings=True, show_files=True, items=None, accels=True,
                 removal_confirmer=None):
        super(SongsMenu, self).__init__()
        # The library may actually be a librarian; if it is, use it,
        # otherwise find the real librarian.
        librarian = getattr(library, 'librarian', library)

        if ratings:
            ratings_item = RatingsMenuItem(songs, librarian)
            ratings_item.set_sensitive(bool(songs))
            self.append(ratings_item)
            self.separate()

        # external item groups
        for subitems in reversed(items or []):
            self.separate()
            for item in subitems:
                self.append(item)
            self.separate()

        if plugins:
            submenu = self.plugins.Menu(librarian, songs)
            if submenu is not None:
                b = qltk.MenuItem(_("_Plugins"), Icons.SYSTEM_RUN)
                b.set_sensitive(bool(songs))
                self.append(b)
                b.set_submenu(submenu)
                self.append(SeparatorMenuItem())

        in_lib = True
        can_add = True
        is_file = True
        for song in songs:
            if song not in library:
                in_lib = False
            if not song.can_add:
                can_add = False
            if not song.is_file:
                is_file = False

        if playlists:
            # Needed here to avoid a circular import; most browsers use
            # a SongsMenu, but SongsMenu needs access to the playlist
            # browser for this item.

            # FIXME: Two things are now importing browsers, so we need
            # some kind of inversion of control here.
            from quodlibet.browsers.playlists.menu import PlaylistMenu
            from quodlibet.browsers.playlists import PlaylistsBrowser
            try:
                submenu = PlaylistMenu(songs, PlaylistsBrowser.playlists())

                def on_new(widget, playlist):
                    PlaylistsBrowser.changed(playlist)
                submenu.connect('new', on_new)
            except AttributeError as e:
                print_w("Couldn't get Playlists menu: %s" % e)
            else:
                b = qltk.MenuItem(_("Play_lists"), Icons.FOLDER_DRAG_ACCEPT)
                b.set_sensitive(can_add and bool(songs))
                b.set_submenu(submenu)
                self.append(b)
        if queue:
            b = qltk.MenuItem(_("Add to _Queue"), Icons.LIST_ADD)

            def enqueue_cb(item, songs):
                songs = [s for s in songs if s.can_add]
                if songs:
                    from quodlibet import app
                    app.window.playlist.enqueue(songs)

            b.connect('activate', enqueue_cb, songs)
            if accels:
                qltk.add_fake_accel(b, "<Primary>Return")
            self.append(b)
            b.set_sensitive(can_add and bool(songs))

        if remove or delete:
            self.separate()

        if remove:
            self._confirm_song_removal = (removal_confirmer or
                                          confirm_song_removal_invoke)
            b = qltk.MenuItem(_("_Remove from Library…"), Icons.LIST_REMOVE)
            if callable(remove):
                b.connect('activate', lambda item: remove(songs))
            else:
                def remove_cb(item, songs, library):
                    parent = get_menu_item_top_parent(item)
                    if self._confirm_song_removal(parent, songs):
                        library.remove(songs)

                b.connect('activate', remove_cb, songs, library)
                b.set_sensitive(in_lib and bool(songs))
            self.append(b)

        if delete:
            if callable(delete):
                b = qltk.MenuItem(_("_Delete"), Icons.EDIT_DELETE)
                b.connect('activate', lambda item: delete(songs))
                if accels:
                    qltk.add_fake_accel(b, "<Primary>Delete")
            else:
                b = TrashMenuItem()
                if accels:
                    qltk.add_fake_accel(b, "<Primary>Delete")

                def trash_cb(item):
                    parent = get_menu_item_top_parent(item)
                    trash_songs(parent, songs, librarian)

                b.connect('activate', trash_cb)
                b.set_sensitive(is_file and bool(songs))
            self.append(b)

        if edit:
            self.separate()
            b = qltk.MenuItem(_("Edit _Tags"), Icons.EDIT)
            b.set_sensitive(bool(songs))
            if accels:
                qltk.add_fake_accel(b, "<alt>Return")

            def song_properties_cb(menu_item):
                parent = get_menu_item_top_parent(menu_item)
                window = SongProperties(librarian, songs, parent)
                window.show()

            b.connect('activate', song_properties_cb)
            self.append(b)

            b = qltk.MenuItem(_("_Information"), Icons.DIALOG_INFORMATION)
            b.set_sensitive(bool(songs))
            if accels:
                qltk.add_fake_accel(b, "<Primary>I")

            def information_cb(menu_item):
                parent = get_menu_item_top_parent(menu_item)
                window = Information(librarian, songs, parent)
                window.show()
            b.connect('activate', information_cb)
            self.append(b)

        if show_files and any(is_a_file(s) for s in songs):
            def show_files_cb(menu_item):
                print_d("Trying to show files...")
                if not show_songs(songs):
                    parent = get_menu_item_top_parent(menu_item)
                    msg = ErrorMessage(parent,
                                 _("Unable to show files"),
                                 _("Error showing files, "
                                   "or no program available to show them."))
                    msg.run()

            self.separate()
            total = len([s for s in songs if is_a_file(s)])
            text = ngettext(
                "_Show in File Manager",
                "_Show %(total)d Files in File Manager", total) % {
                    "total": total}
            b = qltk.MenuItem(text, Icons.DOCUMENT_OPEN)
            b.set_sensitive(bool(songs)
                            and len(songs) < MenuItemPlugin.MAX_INVOCATIONS)
            b.connect('activate', show_files_cb)
            self.append(b)

        def selection_done_cb(menu):
            menu.destroy()

        self.connect('selection-done', selection_done_cb)

    def separate(self):
        if not self.get_children():
            return
        elif not isinstance(self.get_children()[-1], Gtk.SeparatorMenuItem):
            self.append(SeparatorMenuItem())

    def preseparate(self):
        if not self.get_children():
            return
        elif not isinstance(self.get_children()[0], Gtk.SeparatorMenuItem):
            self.prepend(SeparatorMenuItem())
