# Python imports
import os

# Lib imports
import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk
from gi.repository import GLib

# Application imports
from ..widgets.image import Image



class ImageList(Gtk.Box):
    def __init__(self):
        super(ImageList, self).__init__()

        self.path     = None
        self.img_list = None

        self._setup_styling()
        self._setup_signals()
        self._subscribe_to_events()
        self._load_widgets()


    def _setup_styling(self):
        self.set_orientation(Gtk.Orientation.VERTICAL)
        self.set_spacing(15)

    def _setup_signals(self):
        ...

    def _subscribe_to_events(self):
        event_system.subscribe("load_image_list", self.load_image_list)

    def _load_widgets(self):
        ...

    def _clear_children(self, widget: type) -> None:
        ''' Clear children of a gtk widget. '''
        for child in widget.get_children():
            widget.remove(child)

    def _marshal_paths(self):
        paths = []
        for img in self.img_list:
            path = os.path.join(self.path, img)
            paths.append(path)

        return paths

    def load_image_list(self, path = None, img_list: [] = []):
        if not path or len(img_list) == 0:
            return

        logger.debug(f"Loading images from: {path}\nList: {img_list}")
        self.path     = path
        self.img_list = img_list
        paths         = self._marshal_paths()

        self._clear_children(self)
        for file in paths:
            self.add( Image(file) )

        event_system.emit("update_list_size_constraints", (len(paths),))
        self.show_range()

    def show_range(self, i = 0, j = settings.get_max_ring_thumbnail_list()):
        children = self.get_children()
        if len(children) <= j:
            j = len(children) - 1

        while i <= j:
            child = children[i]
            self.load_child_pixbuf_threaded(child)
            i += 1

    @daemon_threaded
    def load_child_pixbuf_threaded(self, child):
        GLib.idle_add(child.load_pixbuf)
        GLib.idle_add(child.show)
        Gtk.main_iteration()