#!/usr/bin/env python

from __future__ import annotations

import urwid

BLACK_FGS = ('light gray', 'dark cyan', 'dark red', 'dark green',
    'dark magenta', 'white', 'light blue', 'light cyan', 'light red',
    'light green', 'yellow', 'light magenta')
GRAY_FGS = ('black', 'dark blue', 'dark cyan', 'dark red', 'dark green',
    'dark magenta', 'white', 'light red', 'yellow',
    'light magenta')
BLUE_FGS = ('light gray', 'dark cyan', 'white',
    'light cyan', 'light red', 'light green', 'yellow',
    'light magenta')
CYAN_FGS = ('black', 'light gray', 'dark blue', 'white', 'light cyan',
    'light green', 'yellow')

BG_FGS =[
    ('black', BLACK_FGS),
    ('light gray', GRAY_FGS),
    ('dark blue', BLUE_FGS),
    ('dark cyan', CYAN_FGS),
    ]

body = urwid.SimpleFocusListWalker([])

for bg, fgs in BG_FGS:
    spec = urwid.AttrSpec(fgs[0], bg)
    def s(w):
        return urwid.AttrMap(w, spec)
    body.append(s(urwid.Divider()))
    body.append(s(
        urwid.GridFlow(
            [
                urwid.AttrMap(
                    urwid.Text(f"'{fg}' on '{bg}'"),
                    urwid.AttrSpec(fg, bg)
                )
                for fg in fgs
            ],
            35, 0, 0, 'left')))
    body.append(s(urwid.Divider()))

urwid.MainLoop(urwid.ListBox(body)).run()