# -*- coding: utf-8 -*-

# Copyright (C) 2006 Osmo Salomaa
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.

"""Baseclass and wrapper for :class:`Gtk.Builder` constructed dialogs."""

import aeidon
import os

from gi.repository import Gtk

__all__ = ("BuilderDialog",)


class BuilderDialog:

    """
    Baseclass and wrapper for :class:`Gtk.Builder` constructed dialogs.

    :cvar _widgets: List of names of widgets to be assigned as attributes

    All widgets defined in :attr:`_widgets` are assigned as instance variables
    with names preceded by a single underscore. All signals defined in the UI
    definition file are connected to ``self``. All :func:`getattr` calls not
    found in ``self`` are delegated to :attr:`self._dialog` allowing ``self``
    to look and act like a :class:`Gtk.Dialog`.
    """

    _widgets = ()

    def __init__(self, ui_file_path, connect_signals=True):
        """Initialize a :class:`BuilderDialog` instance from `ui_file_path`."""
        if not os.path.isabs(ui_file_path):
            ui_file_path = os.path.join(aeidon.DATA_DIR, "ui", ui_file_path)
        self._builder = Gtk.Builder()
        self._builder.set_translation_domain("gaupol")
        self._builder.add_from_file(ui_file_path)
        self._dialog = self._builder.get_object("dialog")
        if connect_signals:
            self._builder.connect_signals(self)
        self._set_attributes(self._widgets)

    def __getattr__(self, name):
        """Return attribute from :attr:`_dialog`."""
        return getattr(self._dialog, name)

    def run(self):
        """Show the dialog, run it and return response."""
        self._dialog.show()
        return self._dialog.run()

    def _set_attributes(self, widgets, prefix=None):
        """Assign all names in `widgets` as attributes of `self`."""
        for name in widgets:
            widget = self._builder.get_object(name)
            if prefix is not None and name.startswith(prefix):
                name = name.replace(prefix, "")
            setattr(self, "_{}".format(name), widget)
