from __future__ import annotations

import importlib.util
import os
from pathlib import Path
from types import ModuleType


def _user_config_path() -> Path | None:
    explicit = os.environ.get("COPIENATOR_CONFIG", "").strip()
    if explicit:
        return Path(explicit).expanduser().resolve()
    local = Path.cwd() / "config.py"
    return local.resolve() if local.is_file() else None


def _load_user_config(path: Path) -> ModuleType:
    if not path.is_file():
        raise FileNotFoundError(f"Copienator configuration not found: {path}")
    spec = importlib.util.spec_from_file_location("_copienator_user_config", path)
    if spec is None or spec.loader is None:
        raise ImportError(f"Could not load Copienator configuration: {path}")
    module = importlib.util.module_from_spec(spec)
    spec.loader.exec_module(module)
    return module


CONFIG_PATH = _user_config_path()
if CONFIG_PATH is None:
    import default_config as _configuration
else:
    _configuration = _load_user_config(CONFIG_PATH)

# Keep new optional settings compatible with older personal configuration files.
ALWAYS_CROP = False
RETURN_JPEG_ENABLED = True
RETURN_PDF_ENABLED = True
RETURN_ANSWERS_ENABLED = False
RETURN_ANSWERS_CONTEXT = False
RETURN_ANSWERS_QUESTION = True
RETURN_ANSWERS_SOLUTION = False
FINAL_SCORE_HISTOGRAM_PATH = Path("histogramme.pdf")
for _name in dir(_configuration):
    if not _name.startswith("_"):
        globals()[_name] = getattr(_configuration, _name)