"""LintQ detector stub -- auto-scaffolded from research note.

Generated by detector_stub_cron.py for cluster 39
(label: PennyLane:concurrency).

Source note (#24): PATTERN: Concurrency/executor bugs -- argument unpacking and map() over single-argument callables, type errors under parallel executors. 1 issue(s) across: PennyLane. Sample: Open GitHub issue #9601 in PennyLaneAI/pennylane reported by @Ti…
"""

from __future__ import annotations

from typing import Dict, List


class DetectorConcurrency:
    """Detect the 'concurrency' anti-pattern reported against PennyLane.

    STATUS: STUB. This class was scaffolded automatically from a real issue
    cluster in lintq_research.db. Fill in ``detect`` with the logic below and
    add it to the engine rule set.

    TODO -- implement the detection:
        PATTERN: Concurrency/executor bugs -- argument unpacking and map() over single-argument callables, type errors under parallel executors. 1 issue(s) across: PennyLane. Sample: Open GitHub issue #9601 in PennyLaneAI/pennylane reported by @Timeless-hep: [BUG] PyNativeExec.map fails to unpack iterables for single-argument functions, caus

        DETECTION LOGIC: Add a LintQ detector 'executor-arg-unpack' that inspects pennylane-style concurrent execution to flag map(f, single_arg) patterns where f takes one argument but is invoked in a per-element executor expecting an iterable, and verify callable arity matches the executor's fan-out. Catches TypeError at lint time.
    """

    id = "concurrency"
    theme = "concurrency"
    software = "PennyLane"
    cluster_id = 39
    note_id = 24

    def detect(self, facts: Dict) -> List[Dict]:
        """Return a list of warning dicts for the given extracted facts.

        Args:
            facts: the 7-relation EDB fact dict produced by the extractor
                (Stmt, CFGEdge, Assign, CircuitAlloc, GateOp, MeasureOp,
                CircuitCall).

        Returns:
            A list of warning dicts, e.g.
            {"kind": "concurrency", "stmt": <id>, "qubit": <q>, "detail": <str>}.
        """
        raise NotImplementedError(
            "Detector stub -- implement 'concurrency' detection for PennyLane. "
            "See the TODO block in this class for the source note's logic."
        )