# Copyright (c) 2014-2017 Cedric Bellegarde <cedric.bellegarde@adishatz.org>
# 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 3 of the License, 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, see <http://www.gnu.org/licenses/>.

from gi.repository import Gtk, GLib, GObject

from gettext import gettext as _

from lollypop.view import LazyLoadingView
from lollypop.widgets_album_simple import AlbumSimpleWidget
from lollypop.pop_album import AlbumPopover
from lollypop.view_artist_albums import ArtistAlbumsView
from lollypop.define import ArtSize


class AlbumsView(LazyLoadingView):
    """
        Show albums in a box
    """

    def __init__(self, genre_ids, artist_ids):
        """
            Init album view
            @param genre ids as [int]
            @param artist ids as [int]
        """
        LazyLoadingView.__init__(self, True)
        self.__signal = None
        self.__current = None
        self.__context_album_id = None
        self.__genre_ids = genre_ids
        self.__artist_ids = artist_ids
        self.__press_rect = None

        self._box = Gtk.FlowBox()
        self._box.set_filter_func(self._filter_func)
        self._box.set_selection_mode(Gtk.SelectionMode.NONE)
        self._box.connect('child-activated', self.__on_album_activated)
        # Allow lazy loading to not jump up and down
        self._box.set_homogeneous(True)
        self._box.set_max_children_per_line(1000)
        self._box.show()

        self._viewport.set_property('valign', Gtk.Align.START)
        self._viewport.set_property('margin', 5)
        self._scrolled.set_property('expand', True)

        self.add(self._scrolled)

    def populate(self, albums):
        """
            Populate albums
            @param is compilation as bool
        """
        GLib.idle_add(self.__add_albums, albums)

#######################
# PROTECTED           #
#######################
    def _get_children(self):
        """
            Return view children
            @return [AlbumWidget]
        """
        children = []
        for child in self._box.get_children():
            children.append(child)
        return children

#######################
# PRIVATE             #
#######################
    def __add_albums(self, albums):
        """
            Add albums to the view
            Start lazy loading
            @param [album ids as int]
        """
        if self._stop:
            self._stop = False
            return
        if albums:
            widget = AlbumSimpleWidget(albums.pop(0),
                                       self.__genre_ids,
                                       self.__artist_ids)
            widget.connect('overlayed', self._on_overlayed)
            self._box.insert(widget, -1)
            widget.show()
            self._lazy_queue.append(widget)
            GLib.idle_add(self.__add_albums, albums)
        else:
            GLib.idle_add(self.lazy_loading)
            if self._viewport.get_child() is None:
                self._viewport.add(self._box)

    def __on_album_activated(self, flowbox, album_widget):
        """
            Show Context view for activated album
            @param flowbox as Gtk.Flowbox
            @param album_widget as AlbumSimpleWidget
        """
        # Here some code for touch screens
        # If mouse pointer activate Gtk.FlowBoxChild, overlay is on,
        # as enter notify event enabled it
        # Else, we are in touch screen, first time show overlay, next time
        # show popover
        if not album_widget.is_overlay:
            album_widget.show_overlay(True)
            return
        cover = album_widget.get_cover()
        if cover is None:
            return
        # If widget top not on screen, popover will fail to show
        # FIXME: Report a bug and check always true
        (x, y) = album_widget.translate_coordinates(self._scrolled, 0, 0)
        if y < 0:
            y = album_widget.translate_coordinates(self._box, 0, 0)[1]
            self._scrolled.get_allocation().height + y
            self._scrolled.get_vadjustment().set_value(y)
        allocation = self.get_allocation()
        (x, top_height) = album_widget.translate_coordinates(self, 0, 0)
        bottom_height = allocation.height -\
            album_widget.get_allocation().height -\
            top_height
        if bottom_height > top_height:
            height = bottom_height
        else:
            height = top_height
        popover = AlbumPopover(album_widget.id,
                               self.__genre_ids,
                               self.__artist_ids,
                               allocation.width,
                               height,
                               ArtSize.NONE)
        popover.set_relative_to(cover)
        popover.set_position(Gtk.PositionType.BOTTOM)
        album_widget.show_overlay(False)
        album_widget.lock_overlay(True)
        popover.connect('closed', self.__on_album_popover_closed, album_widget)
        popover.show()
        self.__current = album_widget
        cover.set_opacity(0.9)

    def __on_album_popover_closed(self, popover, album_widget):
        """
            Remove overlay and restore opacity
            @param popover as Gtk.Popover
            @param album_widget as AlbumWidget
        """
        album_widget.lock_overlay(False)
        album_widget.get_cover().set_opacity(1)


class AlbumBackView(Gtk.Grid):
    """
        Show an album view with a back button (destroying AlbumView)
    """
    __gsignals__ = {
        'back-clicked': (GObject.SignalFlags.RUN_FIRST, None, ()),
    }

    def __init__(self, album_id, genre_ids, artist_ids):
        """
            Init view
            @param album id as int
            @param genre ids as [int]
            @param artist ids as [int]
        """
        Gtk.Grid.__init__(self)
        self.set_orientation(Gtk.Orientation.VERTICAL)
        back_button = Gtk.Button.new_from_icon_name("go-previous-symbolic",
                                                    Gtk.IconSize.MENU)
        back_button.set_tooltip_text(_("Go back"))
        back_button.connect('clicked', self.__on_back_button_clicked)
        back_button.set_property('halign', Gtk.Align.START)
        back_button.set_relief(Gtk.ReliefStyle.NONE)
        back_button.show()
        self.add(back_button)
        view = ArtistAlbumsView(artist_ids, genre_ids, ArtSize.HEADER)
        view.populate([album_id])
        view.show()
        self.add(view)
        self.show()

#######################
# PRIVATE             #
#######################
    def __on_back_button_clicked(self, button):
        """
            Destroy self
            @param button as Gtk.Button
        """
        self.emit('back-clicked')
