# -*- coding: utf-8 -*-
# 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.

from typing import Literal

from gi.repository import GLib
from gi.repository import Gtk
from gi.repository import Pango

from xl import event, formatter, main, settings, xdg
from xl.nls import gettext as _, ngettext
import xlgui
from xlgui import cover, guiutil
from xlgui.widgets import playlist, queue
from xlgui.widgets.playback import PlaybackProgressBar


class TrackInfoPane(Gtk.Bin):
    """
    Displays cover art and track data
    """

    def __init__(self, player):
        Gtk.Bin.__init__(self)
        self.__player = player

        builder = guiutil.get_builder(
            xdg.get_data_path('ui', 'widgets', 'track_info.ui')
        )
        info_box = builder.get_object('info_box')
        info_box.get_parent().remove(info_box)
        self.add(info_box)

        self.__auto_update = False
        self.__display_progress = False
        self.__formatter = formatter.TrackFormatter(
            _(
                '<span size="x-large" weight="bold">$title</span>\n'
                'by $artist\n'
                'from $album'
            )
        )
        self.__formatter.connect('notify::format', self.on_notify_format)
        self.__default_text = '<span size="x-large" ' 'weight="bold">%s</span>\n\n' % _(
            'Not Playing'
        )
        self.__cover_size = None
        self.__timer = None
        self.__track = None

        self.info_label = builder.get_object('info_label')
        self.action_area = builder.get_object('action_area')
        self.progress_box = builder.get_object('progress_box')
        self.playback_image = builder.get_object('playback_image')
        self.progressbar = PlaybackProgressBar(player)
        guiutil.gtk_widget_replace(builder.get_object('progressbar'), self.progressbar)

        self.cover = cover.CoverWidget(builder.get_object('cover_image'))
        self.cover.hide()
        self.cover.set_no_show_all(True)

        self.clear()
        self.__update_widget_state()

    def destroy(self):
        """
        Cleanups
        """
        # Make sure to disconnect callbacks
        self.set_auto_update(False)

        Gtk.Bin.destroy(self)

    def get_auto_update(self):
        """
        Gets whether the info pane shall
        be automatically updated or not

        :rtype: bool
        """
        return self.__auto_update

    def set_auto_update(self, auto_update):
        """
        Sets whether the info pane shall
        be automatically updated or not

        :param auto_update: enable or disable
            automatic updating
        :type auto_update: bool
        """
        if auto_update != self.__auto_update:
            self.__auto_update = auto_update

            p_evts = [
                'playback_player_end',
                'playback_track_start',
                'playback_toggle_pause',
                'playback_error',
            ]
            events = ['track_tags_changed', 'cover_set', 'cover_removed']

            if auto_update:
                for e in p_evts:
                    event.add_ui_callback(getattr(self, 'on_%s' % e), e, self.__player)
                for e in events:
                    event.add_ui_callback(getattr(self, 'on_%s' % e), e)

                self.set_track(self.__player.current)
            else:
                for e in p_evts:
                    event.remove_callback(getattr(self, 'on_%s' % e), e, self.__player)
                for e in events:
                    event.remove_callback(getattr(self, 'on_%s' % e), e)

    def get_cover_size(self):
        """
        Gets the preferred cover size

        :rtype: int
        """
        return self.__cover_size or settings.get_option('gui/cover_width', 100)

    def set_cover_size(self, cover_size):
        """
        Overrides the cover size to display,
        set to None to use global default

        :param cover_size: the preferred cover size
        :type cover_size: int
        """
        self.__cover_size = cover_size

    def get_default_text(self):
        """
        Gets the default text displayed
        when the playback is stopped

        :rtype: string
        """
        return self.__default_text

    def set_default_text(self, default_text):
        """
        Sets the default text displayed
        when the playback is stopped

        :param default_text: the new default text
        :type default_text: string
        """
        self.__default_text = default_text

    def get_display_progress(self):
        """
        Returns whether the progress indicator
        is currently visible or not

        :rtype: bool
        """
        return self.__display_progress

    def set_display_progress(self, display_progress):
        """
        Shows or hides the progress indicator. The
        indicator will not be displayed if the
        currently displayed track is not playing.

        :param display_progress: Whether to show
            or hide the progress indicator
        :type display_progress: bool
        """
        self.__display_progress = display_progress
        self.__update_widget_state()

    def get_info_format(self):
        """
        Gets the current format used
        to display the track data

        :rtype: string
        """
        return self.__formatter.props.format

    def set_info_format(self, format):
        """
        Sets the format used to display the track data

        :param format: the format, see the documentation
            of :class:`string.Template` for details
        :type format: string
        """
        self.__formatter.props.format = format

    def set_track(self, track):
        """
        Updates the data displayed in the info pane

        :param track: A track to take the data from,
            clears the info pane if track is None
        :type track: :class:`xl.trax.Track`
        """
        if track is None:
            self.clear()
            return

        self.__track = track

        self.cover.set_track(track)

        self.info_label.set_markup(self.__formatter.format(track, markup_escape=True))
        self.__update_widget_state()

    def __update_widget_state(self):
        if self.__display_progress:
            if self.__track == self.__player.current and not self.__player.is_stopped():
                if self.__player.is_paused():
                    icon_name = 'media-playback-pause'
                else:
                    icon_name = 'media-playback-start'
                self.playback_image.set_from_icon_name(
                    icon_name, Gtk.IconSize.SMALL_TOOLBAR
                )

            self.progress_box.set_no_show_all(False)
            self.progress_box.set_visible(True)
            self.progressbar.set_visible(True)
        else:
            self.progress_box.set_visible(False)
            self.progress_box.set_no_show_all(True)
            self.progressbar.set_visible(True)

    def clear(self):
        """
        Resets the info pane
        """

        self.cover.set_track(None)
        self.info_label.set_markup(self.__default_text)

        self.__track = None
        self.__update_widget_state()

    def get_action_area(self):
        """
        Retrieves the action area
        at the end of the pane

        :rtype: :class:`Gtk.Box`
        """
        return self.action_area

    def on_notify_format(self, formatter, format):
        """
        Updates the displayed data after format changes
        """
        if self.__track is not None:
            self.set_track(self.__track)

    def on_playback_player_end(self, event, player, track):
        """
        Clears the info pane on playback end
        """
        self.clear()

    def on_playback_track_start(self, event, player, track):
        """
        Updates the info pane on track start
        """
        self.set_track(track)

    def on_playback_toggle_pause(self, event, player, track):
        """
        Updates the info pane on playback pause/resume
        """
        self.set_track(track)

    def on_playback_error(self, event, player, message):
        """
        Clears the info pane on playback errors
        """
        self.clear()

    def on_track_tags_changed(self, event, track, tags):
        """
        Updates the info pane on tag changes
        """
        if (
            self.__player is not None
            and not self.__player.is_stopped()
            and track is self.__track
        ):
            self.set_track(track)

    def on_cover_set(self, event, covers, track):
        """
        Updates the info pane on cover set
        """
        if track is self.__track:
            self.set_track(track)

    def on_cover_removed(self, event, covers, track):
        """
        Updates the info pane on cover removal
        """
        if track is self.__track:
            self.set_track(track)


class ToolTip:
    """
    Custom tooltip class to allow for
    extended tooltip functionality
    """

    def __init__(self, parent, widget):
        """
        :param parent: the parent widget the tooltip
            should be attached to
        :param widget: the tooltip widget to be used
            for the tooltip
        """
        if self.__class__.__name__ == 'ToolTip':
            raise TypeError(
                "cannot create instance of abstract "
                "(non-instantiable) type `ToolTip'"
            )

        self.__widget = widget
        self.__widget.unparent()  # Just to be sure

        parent.set_has_tooltip(True)
        parent.connect('query-tooltip', self.on_query_tooltip)

    def on_query_tooltip(self, widget, x, y, keyboard_mode, tooltip):
        """
        Puts the custom widget into the tooltip
        """
        tooltip.set_custom(self.__widget)

        return True


class TrackToolTip(TrackInfoPane, ToolTip):
    """
    Track specific tooltip class, displays
    track data and progress indicators
    """

    def __init__(self, parent, player):
        """
        :param parent: the parent widget the tooltip
            should be attached to
        """
        TrackInfoPane.__init__(self, player)
        ToolTip.__init__(self, parent, self)

        self.set_border_width(6)
        self.info_label.set_ellipsize(Pango.EllipsizeMode.NONE)
        self.cover.set_no_show_all(False)
        self.cover.show_all()

    def destroy(self):
        """
        Cleanups
        """
        TrackInfoPane.destroy(self)


class StatusbarTextFormatter(formatter.Formatter):
    """
    A text formatter for status indicators
    """

    def __init__(self, format):
        """
        :param format: The initial format, see the documentation
            of string.Template for details
        :type format: string
        """
        formatter.Formatter.__init__(self, format)

        self._substitutions = {
            'collection_count': self.get_collection_count,
            'playlist_count': self.get_playlist_count,
            'playlist_duration': self.get_playlist_duration,
        }

    def get_collection_count(self):
        """
        Retrieves the collection count
        """
        if not settings.get_option('gui/show_status_bar_collection_count', True):
            return ''
        return _('%d in collection') % main.exaile().collection.get_count()

    def get_playlist_count(
        self, selection: Literal['none', 'override', 'only'] = 'none'
    ):
        """
        Retrieves the count of tracks in either the
        full playlist or the current selection

        :param selection: 'none' for playlist count only,
            'override' for selection count if tracks are selected,
            playlist count otherwise, 'only' for selection count only
        """
        if not settings.get_option(
            'gui/show_status_bar_count_tracks_in_playlist', True
        ):
            return ""

        page = xlgui.main.get_selected_page()

        if not isinstance(page, playlist.PlaylistPage) and not isinstance(
            page, queue.QueuePage
        ):
            return ""

        playlist_count = len(page.playlist)
        selection_count = page.view.get_selection_count()

        if selection == 'none':
            return ngettext("%d showing", "%d showing", playlist_count) % playlist_count
        elif selection == 'override':
            if selection_count > 1:
                return (
                    ngettext("%d selected", "%d selected", selection_count)
                    % selection_count
                )
            else:
                return (
                    ngettext("%d showing", "%d showing", playlist_count)
                    % playlist_count
                )
        elif selection == 'only':
            return (
                ngettext("%d selected", "%d selected", selection_count)
                % selection_count
            )

        raise ValueError(
            'Invalid argument "%s" passed to parameter '
            '"selection" for "playlist_count", possible arguments are '
            '"none", "override" and "only"' % selection
        )

    def get_playlist_duration(self, format='short', selection='none'):
        """
        Retrieves the duration of all tracks in
        the playlist or within the selection

        :param format: Verbosity of the output
            Possible values are short, long or verbose
            yielding "1:02:42", "1h, 2m, 42s" or
            "1 hour, 2 minutes, 42 seconds"
        :type format: string
        :param selection: 'none' for playlist count only,
            'override' for selection count if tracks are selected,
            playlist count otherwise, 'only' for selection count only
        :type selection: string
        """
        if not settings.get_option('gui/show_status_bar_time_in_playlist', True):
            return ''

        page = xlgui.main.get_selected_page()

        if not isinstance(page, playlist.PlaylistPage) and not isinstance(
            page, queue.QueuePage
        ):
            return ''

        playlist_duration = sum(t.get_tag_raw('__length') or 0 for t in page.playlist)
        selection_tracks = page.view.get_selected_tracks()
        selection_count = len(selection_tracks)
        selection_duration = sum(
            t.get_tag_raw('__length') or 0 for t in selection_tracks
        )

        if selection == 'none':
            duration = playlist_duration
        elif selection == 'override':
            if selection_count > 1:
                duration = selection_duration
            else:
                duration = playlist_duration
        elif selection == 'only':
            if selection_count > 1:
                duration = selection_duration
            else:
                duration = 0
        else:
            raise ValueError(
                'Invalid argument "%s" passed to parameter '
                '"selection" for "playlist_duration", possible arguments are '
                '"none", "override" and "only"' % selection
            )

        return formatter.LengthTagFormatter.format_value(duration, format)


class Statusbar:
    """
    Convenient access to multiple status labels
    """

    def __init__(self, status_bar):
        """
        Initialises the status bar
        """
        self.status_bar = status_bar

        self.formatter = StatusbarTextFormatter(self._get_substitutions())

        self.info_label = Gtk.Label()

        box = self.status_bar.get_message_area()

        box.pack_end(self.info_label, False, True, 0)

        self.context_id = self.status_bar.get_context_id('status')
        self.message_ids = []

        event.add_callback(self._on_option_set, "gui_option_set")

    def _get_substitutions(self) -> str:
        sub = settings.get_option('gui/statusbar_info_format', '')

        if sub:
            return sub

        show_playlist_count = settings.get_option(
            'gui/show_status_bar_count_tracks_in_playlist', True
        )
        show_playlist_duration = settings.get_option(
            'gui/show_status_bar_time_in_playlist', True
        )
        show_collection_count = settings.get_option(
            'gui/show_status_bar_collection_count', True
        )

        if show_playlist_count:
            sub = sub + '${playlist_count:selection=override}'

        if show_playlist_count and show_playlist_duration:
            sub = (
                sub
                + ' ${playlist_duration:selection=override, format=long, prefix=(, suffix=), pad=0 }'
            )

        elif not show_playlist_count and show_playlist_duration:
            sub = sub + '${playlist_duration:selection=override, format=long, pad=0 }'

        if show_collection_count and (show_playlist_count or show_playlist_duration):
            sub = sub.rstrip() + ', '

        if show_collection_count:
            sub = sub + '$collection_count'

        return sub

    def _on_option_set(self, name, object, option: str):
        if not option in [
            'gui/show_status_bar_collection_count',
            'gui/show_status_bar_count_tracks_in_playlist',
            'gui/show_status_bar_time_in_playlist',
        ]:
            return

        self.formatter = StatusbarTextFormatter(self._get_substitutions())

        self.update_info()

    def set_status(self, status, timeout=0):
        """
        Sets the status message
        """
        self.message_ids += [self.status_bar.push(self.context_id, status)]

        if timeout > 0:
            GLib.timeout_add_seconds(timeout, self.clear_status)

    def clear_status(self):
        """
        Clears the status message
        """
        try:
            for message_id in self.message_ids:
                self.status_bar.remove_message(self.context_id, message_id)
        except AttributeError:
            for message_id in self.message_ids:
                self.status_bar.remove(self.context_id, message_id)

        del self.message_ids[:]
        self.message_ids = []

    def update_info(self):
        """
        Updates the info label text
        """
        if settings.get_option('gui/show_status_bar', True):
            self.status_bar.show()
        else:
            self.status_bar.hide()

        self.info_label.set_label(self.formatter.format())

    def show(self):
        self.status_bar.show()

    def hide(self):
        self.status_bar.hide()


# TODO: Check if we can get a progress indicator in here somehow
class Splash:
    """
    A splash screen suitable for indicating startup;
    will automatically be destroyed after GUI startup
    """

    def __init__(self):
        builder = guiutil.get_builder(xdg.get_data_path('ui', 'splash.ui'))

        image = builder.get_object('splash_image')
        image.set_from_file(xdg.get_data_path('images', 'splash.png'))

        self.window = builder.get_object('SplashScreen')

    def destroy(self):
        """
        Destroys the splash screen
        """
        self.window.destroy()

    def show(self):
        """
        Shows the splash screen
        """
        # Show the splash screen without causing startup notification.
        Gtk.Window.set_auto_startup_notification(False)
        self.window.show_all()
        Gtk.Window.set_auto_startup_notification(True)

        # Ensure the splash is completely drawn before moving on
        while Gtk.events_pending():
            Gtk.main_iteration()

    def hide(self):
        """
        Hides the splash screen
        """
        self.window.hide()
