# contexts.py
#
# Copyright 2023 James Westman <james@jwestman.net>
#
# 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

import typing as T
from dataclasses import dataclass
from functools import cached_property

from .common import *
from .gobject_object import Object
from .gtkbuilder_template import Template


@dataclass
class ValueTypeCtx:
    value_type: T.Optional[GirType]
    allow_null: bool = False
    must_infer_type: bool = False


@dataclass
class ScopeCtx:
    node: AstNode

    @cached_property
    def template(self):
        from .gtk_list_item_factory import ExtListItemFactory
        from .ui import UI

        if isinstance(self.node, UI):
            return self.node.template
        elif isinstance(self.node, ExtListItemFactory):
            return self.node

    @cached_property
    def objects(self) -> T.Dict[str, Object]:
        return {
            obj.tokens["id"]: obj
            for obj in self._iter_recursive(self.node)
            if obj.tokens["id"] is not None
        }

    def validate_unique_ids(self) -> None:
        from .gtk_list_item_factory import ExtListItemFactory

        passed = {}
        for obj in self._iter_recursive(self.node):
            from .gtk_menu import Menu

            if not (isinstance(obj, Object) or isinstance(obj, Menu)) or obj.id is None:
                continue

            if obj.id in passed:
                token = obj.group.tokens["id"]
                if not isinstance(obj, Template) and not isinstance(
                    obj, ExtListItemFactory
                ):
                    raise CompileError(
                        f"Duplicate object ID '{obj.id}'",
                        token.range,
                    )
            passed[obj.id] = obj

    def _iter_recursive(self, node: AstNode):
        yield node
        for child in node.children:
            if child.context[ScopeCtx] is self:
                yield from self._iter_recursive(child)


@dataclass
class ExprValueCtx:
    """Indicates that the context is an expression literal, where the
    "item" keyword may be used."""