#!/usr/bin/env python3

import gi
import locale
import logging
import math
import threading

gi.require_version('Gtk', '4.0')
gi.require_version('Adw', '1')
from gi.repository import Gtk, Gdk, GObject, GdkPixbuf, Gio, Adw
from mcg import client
from mcg.albumheaderbar import AlbumHeaderbar
from mcg.utils import SortOrder
from mcg.utils import Utils
from mcg.utils import GridItem
from mcg.utils import SearchFilter


@Gtk.Template(resource_path='/xyz/suruatoel/mcg/ui/library-panel.ui')
class LibraryPanel(Adw.Bin):
    __gtype_name__ = 'McgLibraryPanel'
    __gsignals__ = {
        'open-standalone': (GObject.SIGNAL_RUN_FIRST, None, ()),
        'close-standalone': (GObject.SIGNAL_RUN_FIRST, None, ()),
        'update': (GObject.SIGNAL_RUN_FIRST, None, ()),
        'play': (GObject.SIGNAL_RUN_FIRST, None, (str, )),
        'queue': (GObject.SIGNAL_RUN_FIRST, None, (str, )),
        'queue-multiple':
        (GObject.SIGNAL_RUN_FIRST, None, (GObject.TYPE_PYOBJECT, )),
        'item-size-changed': (GObject.SIGNAL_RUN_FIRST, None, (int, )),
        'sort-order-changed': (GObject.SIGNAL_RUN_FIRST, None, (int, )),
        'sort-type-changed': (GObject.SIGNAL_RUN_FIRST, None, (bool, )),
        'albumart': (GObject.SIGNAL_RUN_FIRST, None, (str, )),
    }

    # Widgets
    library_stack = Gtk.Template.Child()
    panel_normal = Gtk.Template.Child()
    panel_standalone = Gtk.Template.Child()
    actionbar_revealer = Gtk.Template.Child()
    # Toolbar
    toolbar = Gtk.Template.Child()
    select_button = Gtk.Template.Child()
    toolbar_search_bar = Gtk.Template.Child()
    toolbar_popover = Gtk.Template.Child()
    toolbar_sort_order_button = Gtk.Template.Child()
    sort_artist = Gtk.Template.Child()
    sort_title = Gtk.Template.Child()
    sort_year = Gtk.Template.Child()
    sort_modified = Gtk.Template.Child()
    grid_scale = Gtk.Template.Child()
    # Filter/search bar
    filter_bar = Gtk.Template.Child()
    filter_entry = Gtk.Template.Child()
    # Progress Bar
    stack = Gtk.Template.Child()
    progress_box = Gtk.Template.Child()
    progress_image = Gtk.Template.Child()
    progress_bar = Gtk.Template.Child()
    scroll = Gtk.Template.Child()
    # Library Grid
    library_grid = Gtk.Template.Child()
    # Action bar (normal)
    actionbar = Gtk.Template.Child()
    actionbar_standalone = Gtk.Template.Child()
    # Standalone Image
    standalone_stack = Gtk.Template.Child()
    standalone_spinner = Gtk.Template.Child()
    standalone_scroll = Gtk.Template.Child()
    standalone_image = Gtk.Template.Child()

    def __init__(self, client, **kwargs):
        super().__init__(**kwargs)
        self._logger = logging.getLogger(__name__)
        self._client = client
        self._buttons = {}
        self._albums = None
        self._host = "localhost"
        self._item_size = 150
        self._sort_order = SortOrder.YEAR
        self._sort_type = Gtk.SortType.DESCENDING
        self._grid_pixbufs = {}
        self._grid_width = 0
        self._old_ranges = {}
        self._library_lock = threading.Lock()
        self._library_stop = threading.Event()
        self._icon_theme = Gtk.IconTheme.get_for_display(
            Gdk.Display.get_default())
        self._standalone_pixbuf = None
        self._selected_albums = []
        self._is_selected = False

        # Widgets
        # Header bar
        self._headerbar_standalone = AlbumHeaderbar()
        self._headerbar_standalone.connect('close',
                                           self.on_standalone_close_clicked)
        # Library Grid: Model
        self._library_grid_model = Gio.ListStore()
        self._library_grid_filter = Gtk.FilterListModel()
        self._library_grid_filter.set_model(self._library_grid_model)
        self._library_grid_selection_multi = Gtk.MultiSelection.new(
            self._library_grid_filter)
        self._library_grid_selection_single = Gtk.SingleSelection.new(
            self._library_grid_filter)
        # Library Grid
        self.library_grid.set_model(self._library_grid_selection_single)
        # Toolbar menu
        self.grid_scale.set_value(self._item_size)
        self._toolbar_sort_buttons = {
            SortOrder.ARTIST: self.sort_artist,
            SortOrder.TITLE: self.sort_title,
            SortOrder.YEAR: self.sort_year,
            SortOrder.MODIFIED: self.sort_modified
        }

        # Button controller for grid scale
        button_controller = Gtk.GestureClick()
        button_controller.connect('unpaired-release',
                                  self.on_grid_scale_released)
        self.grid_scale.add_controller(button_controller)

    def get_headerbar_standalone(self):
        return self._headerbar_standalone

    def get_toolbar(self):
        return self.toolbar

    def set_selected(self, selected):
        self._is_selected = selected

    @Gtk.Template.Callback()
    def on_select_toggled(self, widget):
        if self.select_button.get_active():
            self.actionbar_revealer.set_reveal_child(True)
            self.library_grid.set_model(self._library_grid_selection_multi)
            self.library_grid.set_single_click_activate(False)
            self.library_grid.get_style_context().add_class(
                Utils.CSS_SELECTION)
        else:
            self.actionbar_revealer.set_reveal_child(False)
            self.library_grid.set_model(self._library_grid_selection_single)
            self.library_grid.set_single_click_activate(True)
            self.library_grid.get_style_context().remove_class(
                Utils.CSS_SELECTION)

    @Gtk.Template.Callback()
    def on_update_clicked(self, widget):
        self.emit('update')

    def on_grid_scale_released(self, widget, x, y, npress, sequence):
        size = math.floor(self.grid_scale.get_value())
        grid_range = self.grid_scale.get_adjustment()
        if size < grid_range.get_lower() or size > grid_range.get_upper():
            return
        self._item_size = size
        self.emit('item-size-changed', size)
        self._redraw()
        GObject.idle_add(self.toolbar_popover.popdown)

    @Gtk.Template.Callback()
    def on_grid_scale_changed(self, widget):
        size = math.floor(self.grid_scale.get_value())
        grid_range = widget.get_adjustment()
        if size < grid_range.get_lower() or size > grid_range.get_upper():
            return
        self._set_widget_grid_size(self.library_grid, size, True)

    @Gtk.Template.Callback()
    def on_sort_toggled(self, widget):
        if widget.get_active():
            self._sort_order = [
                key for key, value in self._toolbar_sort_buttons.items()
                if value is widget
            ][0]
            self._sort_grid_model()
            self.emit('sort-order-changed', self._sort_order)

    @Gtk.Template.Callback()
    def on_sort_order_toggled(self, button):
        if button.get_active():
            self._sort_type = Gtk.SortType.DESCENDING
        else:
            self._sort_type = Gtk.SortType.ASCENDING
        self._sort_grid_model()
        self.emit('sort-type-changed', button.get_active())

    def set_size(self, width, height):
        self._set_marks()
        self._resize_standalone_image()

    @Gtk.Template.Callback()
    def on_filter_entry_changed(self, widget):
        self._library_grid_filter.set_filter(
            SearchFilter(self.filter_entry.get_text()))

    @Gtk.Template.Callback()
    def on_library_grid_clicked(self, widget, position):
        # Get selected album
        item = self._library_grid_filter.get_item(position)
        album = item.get_album()
        album_id = album.get_id()
        self._selected_albums = [album]
        self.emit('albumart', album_id)

        # Show standalone album
        if widget.get_model() == self._library_grid_selection_single:
            # Set labels
            self._headerbar_standalone.set_album(album)

            # Show panel
            self._open_standalone()

            # Set cover loading indicator
            self.standalone_stack.set_visible_child(self.standalone_spinner)
            self.standalone_spinner.start()

    @Gtk.Template.Callback()
    def on_selection_cancel_clicked(self, widget):
        self.select_button.set_active(False)

    @Gtk.Template.Callback()
    def on_selection_add_clicked(self, widget):
        self.emit('queue-multiple', self._get_selected_albums())
        self.select_button.set_active(False)

    @Gtk.Template.Callback()
    def on_standalone_play_clicked(self, widget):
        self.emit('play', self._selected_albums[0].get_id())
        self._close_standalone()

    @Gtk.Template.Callback()
    def on_standalone_queue_clicked(self, widget):
        self.emit('queue', self._selected_albums[0].get_id())
        self._close_standalone()

    def on_standalone_close_clicked(self, widget):
        self._close_standalone()

    def show_search(self):
        self.filter_bar.set_search_mode(True)

    def set_item_size(self, item_size):
        if self._item_size != item_size:
            self._item_size = item_size
            self.grid_scale.set_value(item_size)
            self._redraw()

    def get_item_size(self):
        return self._item_size

    def set_sort_order(self, sort):
        button = self._toolbar_sort_buttons[sort]
        if button:
            self._sort_order = [
                key for key, value in self._toolbar_sort_buttons.items()
                if value is button
            ][0]
            if not button.get_active():
                button.set_active(True)
            self._sort_grid_model()

    def set_sort_type(self, sort_type):
        if sort_type:
            sort_type_gtk = Gtk.SortType.DESCENDING
        else:
            sort_type_gtk = Gtk.SortType.ASCENDING

        if sort_type_gtk != self._sort_type:
            self._sort_type = sort_type_gtk
            self.toolbar_sort_order_button.set_active(sort_type)
            self._sort_grid_model()

    def get_sort_type(self):
        return (self._sort_type != Gtk.SortType.ASCENDING)

    def init_albums(self):
        self.progress_bar.set_text(locale.gettext("Loading albums"))

    def load_albums(self):
        self.progress_bar.pulse()

    def set_albums(self, host, albums):
        self._host = host
        self._library_stop.set()
        threading.Thread(target=self._set_albums,
                         args=(
                             host,
                             albums,
                             self._item_size,
                         )).start()

    def set_albumart(self, album, data):
        if album in self._selected_albums:
            if data:
                # Load image and draw it
                try:
                    self._standalone_pixbuf = Utils.load_pixbuf(data)
                except Exception:
                    self._logger.exception("Failed to set albumart")
                    self._standalone_pixbuf = self._get_default_image()
            else:
                self._standalone_pixbuf = self._get_default_image()
            # Show image
            GObject.idle_add(self._show_image)

    def _sort_grid_model(self):
        GObject.idle_add(self._library_grid_model.sort,
                         self._grid_model_compare_func, self._sort_order,
                         self._sort_type)

    def _grid_model_compare_func(self, item1, item2, criterion, order):
        return client.MCGAlbum.compare(item1.get_album(), item2.get_album(),
                                       criterion,
                                       (order == Gtk.SortType.DESCENDING))

    def stop_threads(self):
        self._library_stop.set()

    def _set_albums(self, host, albums, size):
        self._library_lock.acquire()
        self._albums = albums
        stack_transition_type = self.stack.get_transition_type()
        GObject.idle_add(self.stack.set_transition_type,
                         Gtk.StackTransitionType.NONE)
        GObject.idle_add(self.stack.set_visible_child, self.progress_box)
        GObject.idle_add(self.progress_bar.set_fraction, 0.0)
        GObject.idle_add(self.stack.set_transition_type, stack_transition_type)
        GObject.idle_add(self._library_grid_model.remove_all)

        i = 0
        n = len(albums)
        cache = client.MCGCache(host, size)
        self._grid_pixbufs.clear()
        for album_id in albums.keys():
            album = albums[album_id]
            pixbuf = None
            try:
                pixbuf = Utils.load_thumbnail(cache, self._client, album, size)
            except client.CommandException:
                # Exception is handled by client
                pass
            except Exception as e:
                self._logger.exception("Failed to load albumart", e)
            if pixbuf is None:
                pixbuf = self._icon_theme.lookup_icon(
                    Utils.STOCK_ICON_DEFAULT, None, self._item_size,
                    self._item_size, Gtk.TextDirection.LTR,
                    Gtk.IconLookupFlags.FORCE_SYMBOLIC)
            if pixbuf is not None:
                self._grid_pixbufs[album.get_id()] = pixbuf
                GObject.idle_add(self._library_grid_model.append,
                                 GridItem(album, pixbuf))

            i += 1
            GObject.idle_add(self.progress_bar.set_fraction, i / n)
            GObject.idle_add(self.progress_bar.set_text,
                             locale.gettext("Loading images"))

        self._library_lock.release()
        GObject.idle_add(self.stack.set_visible_child, self.scroll)
        self._sort_grid_model()

    def _set_widget_grid_size(self, grid_widget, size, vertical):
        self._library_stop.set()
        threading.Thread(target=self._set_widget_grid_size_thread,
                         args=(
                             grid_widget,
                             size,
                             vertical,
                         )).start()

    def _set_widget_grid_size_thread(self, grid_widget, size, vertical):
        self._library_lock.acquire()
        self._library_stop.clear()
        if size == self._item_size:
            self._library_lock.release()
            return
        for i in range(self._library_grid_model.get_n_items()):
            grid_item = self._library_grid_model.get_item(i)
            album_id = grid_item.get_album().get_id()

            pixbuf = self._grid_pixbufs[album_id]
            if pixbuf is not None:
                pixbuf = pixbuf.scale_simple(size, size,
                                             GdkPixbuf.InterpType.NEAREST)
            else:
                pixbuf = self._icon_theme.lookup_icon(
                    Utils.STOCK_ICON_DEFAULT, None, size, size,
                    Gtk.TextDirection.LTR, Gtk.IconLookupFlags.FORCE_SYMBOLIC)
            GObject.idle_add(grid_item.set_cover, pixbuf)

            if self._library_stop.is_set():
                self._library_lock.release()
                return

        self._library_lock.release()

    def _show_image(self):
        self._resize_standalone_image()
        self.standalone_stack.set_visible_child(self.standalone_scroll)
        self.standalone_spinner.stop()

    def _redraw(self):
        if self._albums is not None:
            self.set_albums(self._host, self._albums)

    def _set_marks(self):
        width = self.scroll.get_width()
        if width == self._grid_width:
            return
        self._grid_width = width
        self.grid_scale.clear_marks()

        lower = int(self.grid_scale.get_adjustment().get_lower())
        upper = int(self.grid_scale.get_adjustment().get_upper())
        count_min = max(int(width / upper), 1)
        count_max = max(int(width / lower), 1)
        for index in range(count_min, count_max):
            pixel = int(width / index)
            pixel = pixel - (2 * int(pixel / 100))
            self.grid_scale.add_mark(pixel, Gtk.PositionType.BOTTOM, None)

    def _open_standalone(self):
        self.library_stack.set_visible_child(self.panel_standalone)
        self.emit('open-standalone')

    def _close_standalone(self):
        self.library_stack.set_visible_child(self.panel_normal)
        self.emit('close-standalone')

    def _resize_standalone_image(self):
        # Get size
        size_width = self.standalone_stack.get_width()
        size_height = self.standalone_stack.get_height()

        # Get pixelbuffer
        pixbuf = self._standalone_pixbuf
        # Check pixelbuffer
        if pixbuf is None:
            return

        # Skalierungswert für Breite und Höhe ermitteln
        ratio_w = float(size_width) / float(pixbuf.get_width())
        ratio_h = float(size_height) / float(pixbuf.get_height())
        # Kleineren beider Skalierungswerte nehmen, nicht Hochskalieren
        ratio = min(ratio_w, ratio_h)
        ratio = min(ratio, 1)
        # Neue Breite und Höhe berechnen
        width = int(math.floor(pixbuf.get_width() * ratio))
        height = int(math.floor(pixbuf.get_height() * ratio))
        if width <= 0 or height <= 0:
            return
        # Pixelpuffer auf Oberfläche zeichnen
        self.standalone_image.set_from_pixbuf(
            pixbuf.scale_simple(width, height, GdkPixbuf.InterpType.HYPER))
        self.standalone_image.show()

    def _get_default_image(self):
        return self._icon_theme.lookup_icon(Utils.STOCK_ICON_DEFAULT, None,
                                            512, 512, Gtk.TextDirection.LTR,
                                            Gtk.IconLookupFlags.FORCE_SYMBOLIC)

    def _get_selected_albums(self):
        albums = []
        for i in range(self.library_grid.get_model().get_n_items()):
            if self.library_grid.get_model().is_selected(i):
                albums.append(self.library_grid.get_model().get_item(
                    i).get_album().get_id())
        return albums