"""
ML-based pipeline proposal interface.

This module defines the interface for ML-driven pipeline proposals.
For now it is a stub that always returns None, but it provides a
stable hook where future models can plug in without changing the
API route or NL builder logic.
"""

from typing import Any, Dict, Optional

from flowmason_studio.models.nl_builder import GeneratedPipeline


def propose_pipeline(context: Dict[str, Any]) -> Optional[GeneratedPipeline]:
    """
    Propose a pipeline given the current generation context.

    Args:
        context: Dictionary containing at least:
            - description: str
            - generation_context: dict (options + interpreter context)
            - analysis: GenerationAnalysis or dict (optional)
            - rules_pipeline: GeneratedPipeline from NLBuilderService (optional)

    Returns:
        A GeneratedPipeline if the ML engine proposes one, otherwise None.

    Note:
        This is currently a stub implementation that always returns None.
        It is intended to be replaced or extended with a real ML model.
    """
    _ = context  # placeholder to avoid unused variable warnings
    return None

