#!/usr/bin/env python
# vim:fileencoding=utf-8
# License: GPL v3 Copyright: 2021, Kovid Goyal <kovid at kovidgoyal.net>

from importlib import import_module
import sys


def dynamic_load(name, name_map, already_imported, qt_modules, module_names=()):
    ans = already_imported.get(name, already_imported)
    if ans is not already_imported:
        return ans
    mod_name = name_map.get(name)
    if mod_name is not None:
        mod = qt_modules.get(mod_name)
        if mod is None:
            try:
                mod = qt_modules[mod_name] = import_module(mod_name)
            except ImportError as err:
                mod = qt_modules[mod_name] = False
                print(
                    'Failed to import PyQt module:',
                    mod_name,
                    'with error:',
                    err,
                    file=sys.stderr
                )
        if mod is not False:
            if name in module_names:
                q = mod
            else:
                q = getattr(mod, name, qt_modules)
            if q is not qt_modules:
                already_imported[name] = q
                return q
    raise AttributeError(f'The object {name} is not a known Qt object')
