# Copyright 2023 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from typing import Optional


class GhidraContext:
    """
    State holder for the Ghidra backend to avoid passing state to every function.

    PyGhidra uses a context manager to set up the Ghidra environment (program, transaction, etc.).
    We store the relevant objects here to allow easy access throughout the extractor
    without needing to pass them as arguments to every feature extraction method.
    """

    def __init__(self, program, flat_api, monitor):
        self.program = program
        self.flat_api = flat_api
        self.monitor = monitor


_context: Optional[GhidraContext] = None


def set_context(program, flat_api, monitor):
    global _context
    _context = GhidraContext(program, flat_api, monitor)


def get_context() -> GhidraContext:
    if _context is None:
        raise RuntimeError("GhidraContext not initialized")
    return _context
