import urwid


class TUI(urwid.Frame):

    @classmethod
    def create(cls):

        tui = cls()
        palette = [('header', 'white', 'black'), ('reveal focus', 'black', 'dark cyan', 'standout')]
        loop = urwid.MainLoop(
            tui,
            palette,
            event_loop=urwid.AsyncioEventLoop(),
        )
        tui.loop = loop

        return tui

    def __init__(self):
        self.loop = None
        self.items = [urwid.Text("Feed# " + str(i)) for i in range(0, 15)]
        walker = urwid.SimpleListWalker([urwid.AttrMap(item, None, 'reveal focus') for item in self.items])
        self.lb = urwid.ListBox(walker)
        self.body = self.lb

        super().__init__(self.body)

    def run(self):
        self.loop.run()
        self.executor.shutdown(wait=False)

    def keypress(self, size, key):
        if key in ("j", "down"):
            item_size = len(self.lb.body)
            focus_widget, idx = self.lb.get_focus()
            if idx < item_size - 1:
                idx = idx + 1
                self.lb.set_focus(idx)
        elif key in ("k", "up"):
            focus_widget, idx = self.lb.get_focus()
            if idx > 0:
                idx = idx - 1
                self.lb.set_focus(idx)
        elif key == "a":
            self.lb.body.append(urwid.AttrMap(urwid.Text("XXX"), None, 'reveal focus'))
        else:
            self.lb.keypress(size, key)
            del self.lb.body[3]


tui = TUI.create()
tui.run()