# gtk_dialog.py
#
# Copyright 2022 Gleb Smirnov <glebsmirnov0708@gmail.com>
#
# This file is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as
# published by the Free Software Foundation; either version 3 of the
# License, or (at your option) any later version.
#
# This file 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# SPDX-License-Identifier: LGPL-3.0-or-later


from .common import *


class ResponseId(AstNode):
    """Response ID of GtkDialog's action widget."""

    grammar = [
        UseIdent("response"),
        "=",
        AnyOf(
            UseIdent("response_id"),
            UseNumber("response_id")
        ),
        Optional([
            Keyword("default"), UseLiteral("is_default", True)
        ])
    ]

    @validate()
    def child_type_is_action(self) -> None:
        """Check that child type is "action"."""
        child_type = self.parent.tokens["child_type"]
        if child_type != "action":
            raise CompileError(f"Only action widget can have response ID")

    @validate()
    def parent_is_dialog(self) -> None:
        """Chech that parent widget is `GtkDialog`."""
        from .gobject_object import validate_parent_type

        validate_parent_type(self, "Gtk", "Dialog", "action widgets")

    @validate()
    def widget_have_id(self) -> None:
        """Check that action widget have ID."""
        from .gobject_object import Object

        _object = self.parent.children[Object][0]
        if _object.tokens["id"] is None:
            raise CompileError(f"Action widget must have ID")

    @validate("response_id")
    def correct_response_type(self) -> None:
        """Validate response type.

        Response type might be GtkResponseType member
        or positive number.
        """
        gir = self.root.gir
        response = self.tokens["response_id"]

        if isinstance(response, int):
            if response < 0:
                raise CompileError(
                    "Numeric response type can't be negative")
        elif isinstance(response, float):
            raise CompileError(
                "Response type must be GtkResponseType member or integer,"
                " not float"
            )
        else:
            responses = gir.get_type("ResponseType", "Gtk").members.keys()
            if response not in responses:
                raise CompileError(
                    f"Response type \"{response}\" doesn't exist")

    @validate("default")
    def no_multiple_default(self) -> None:
        """Only one action widget in dialog can be default."""
        from .gtkbuilder_child import Child
        from .gobject_object import Object

        if not self.tokens["is_default"]:
            return

        action_widgets = self.parent_by_type(Object).action_widgets
        for widget in action_widgets:
            if widget == self:
                break
            if widget.tokens["is_default"]:
                raise CompileError("Default response is already set")

    @property
    def widget_id(self) -> str:
        """Get action widget ID."""
        from .gobject_object import Object

        _object: Object = self.parent.children[Object][0]
        return _object.tokens["id"]

    def emit_xml(self, xml: XmlEmitter) -> None:
        """Emit nothing.

        Response ID don't have to emit any XML in place,
        but have to emit action-widget tag in separate
        place (see `ResponseId.emit_action_widget`)
        """

    def emit_action_widget(self, xml: XmlEmitter) -> None:
        """Emit action-widget XML.

        Must be called while <action-widgets> tag is open.

        For more details see `GtkDialog` docs.
        """
        xml.start_tag(
            "action-widget",
            response=self.tokens["response_id"],
            default=self.tokens["is_default"]
        )
        xml.put_text(self.widget_id)
        xml.end_tag()