"""
tests/conftest.py

Stubs out heavy external packages that are not installed in the CI / test
environment — yfinance, sklearn, joblib — so that backend.main and the tool
modules can be imported without errors.  Each stub is only injected when the
real package is absent; if the package IS installed the real one is used.
"""
import sys
from unittest.mock import MagicMock

# ── Packages to stub when not installed ───────────────────────────────────────
_OPTIONAL = [
    "yfinance",
    # sklearn and every sub-module that tool_ml_signal imports at the top level
    "sklearn",
    "sklearn.ensemble",
    "sklearn.linear_model",
    "sklearn.preprocessing",
    "sklearn.model_selection",
    "sklearn.calibration",
    "sklearn.feature_selection",
    "sklearn.metrics",
    # joblib (used by sklearn internally and by tool_ml_signal.py)
    "joblib",
    # dotenv (python-dotenv) used in config/settings.py
    "dotenv",
    # autogen_ext used in config/settings.py model clients
    "autogen_ext",
    "autogen_ext.models",
    "autogen_ext.models.openai",
    "autogen_ext.models.anthropic",
]

for _pkg in _OPTIONAL:
    if _pkg not in sys.modules:
        try:
            __import__(_pkg)
        except ModuleNotFoundError:
            sys.modules[_pkg] = MagicMock()