#!/usr/bin/env python3
# SPDX-License-Identifier: Apache-2.0
"""V8 cipher-agnostic byte-amplification detector — end-to-end inference example.

Three-artefact collaboration. This script:

1. Downloads a bundle from the public NullRabbit/nr-bundles-public dataset
   on Hugging Face.
2. Downloads the V8 model and the scoreability-gated inference helper
   (``predict.py``) from this repository.
3. Loads the bundle manifest via the bundle-spec reference parser
   (NullRabbitLabs/nr-bundle-spec, MIT).
4. Calls ``predict.score_bundle()`` to apply the scoreability gate and
   produce a verdict.

A worked demonstration of the **spec → corpus → model** path: bundles on
disk are conformant with an open spec; the spec's reference parser loads
them; the scoreability-gated inference helper produces verdicts.

Dependencies::

    pip install huggingface_hub pyarrow scikit-learn joblib numpy
    pip install git+https://github.com/NullRabbitLabs/nr-bundle-spec.git

Usage::

    python inference_example.py

Three bundles are scored: a known-attack (sui_F10_multi_get_objects_amp),
a known-benign with traffic (sui_BENIGN_reproducer_pipeline), and a
known-benign without traffic (sui_BENIGN_passive_fullnode) — the third
demonstrates the scoreability gate refusing to predict on empty bundles.
"""

from __future__ import annotations

import importlib.util
import sys
from pathlib import Path

from huggingface_hub import hf_hub_download, snapshot_download


# ─── Constants ──────────────────────────────────────────────────────

V8_MODEL_REPO = "NullRabbit/v8-cipher-agnostic"
DATASET_REPO = "NullRabbit/nr-bundles-public"

# Three sample bundles: attack, scoreable benign, unscoreable benign.
SAMPLES = [
    ("crp_19d438471fec4229", "sui_F10_multi_get_objects_amp", "attack"),
    ("crp_8b85da89c4e34d4c", "sui_BENIGN_reproducer_pipeline", "benign"),
    ("crp_0598afb4d5e44fb9", "sui_BENIGN_passive_fullnode", "benign (passive)"),
]


def _load_module(name: str, path: str) -> "object":
    spec = importlib.util.spec_from_file_location(name, path)
    module = importlib.util.module_from_spec(spec)  # type: ignore[arg-type]
    sys.modules[name] = module
    spec.loader.exec_module(module)  # type: ignore[union-attr]
    return module


def main() -> int:
    print("=== V8 cipher-agnostic byte-amplification detector ===")
    print(f"  model repo:   {V8_MODEL_REPO}")
    print(f"  dataset repo: {DATASET_REPO}")
    print()

    # Pull the V8 model + predict.py (the scoreability-gated helper).
    model_path = hf_hub_download(repo_id=V8_MODEL_REPO, filename="model.joblib")
    predict_path = hf_hub_download(repo_id=V8_MODEL_REPO, filename="predict.py")

    # Load the helper as a module + load V8 via the helper.
    predict = _load_module("v8_predict", predict_path)
    payload = predict.load_v8(model_path)

    print(f"V8 loaded: {type(payload['model']).__name__}, "
          f"{len(payload['feature_names'])} features, "
          f"manifest={payload['manifest_name']!r}")
    print()

    # Pull the three sample bundles.
    dataset_root = Path(snapshot_download(
        repo_id=DATASET_REPO, repo_type="dataset",
        allow_patterns=[f"{cid}/*" for cid, _, _ in SAMPLES],
    ))

    # Score each via the gated helper.
    for corpus_id, primitive_id_expected, label in SAMPLES:
        bundle_dir = dataset_root / corpus_id
        record = predict.score_bundle(bundle_dir, payload)
        print(f"--- {corpus_id} ({primitive_id_expected}) ---")
        print(f"  ground_truth label: {label}")
        print(f"  verdict:            {record['verdict']}")
        if record["verdict"] == "unscoreable":
            print(f"  reason:             {record['reason']}")
            print(f"  n_responses_rows:   {record.get('n_responses_rows', 0)}")
        else:
            print(f"  V8 score:           {record['v8_score']:.4f}")
            print(f"  feature_coverage:   {record['feature_coverage']}")
            print(f"  n_responses_rows:   {record['n_responses_rows']}")
            print(f"  features:")
            for k, v in record["features"].items():
                print(f"    {k:<28s} {v:>12.4f}")
        print()

    print("=" * 72)
    print("Notes on V8 deployment")
    print("=" * 72)
    print("""
- predict.score_bundle() is the recommended consumption surface. The
  scoreability gate refuses to predict on bundles where responses.parquet
  is missing or zero-rows. Callers who want raw model output without the
  gate should load model.joblib directly via joblib.load.

- feature_coverage=resp_only means raw packets.pcap is absent (as in the
  public nr-bundles-public bundles). V8's two cardinality features default
  to 0, which under-scores attacks relative to the model's training
  expectation. For full-coverage inference, produce your own bundles per
  nr-bundle-spec with raw pcap retained.

- V8 is a binary detector for the byte-amplification family. Attacks from
  other vulnerability families (reconnaissance, service_misconfig,
  auth_bypass, rate_limiter_bypass with simulateTransaction shape) will
  score "benign" — this is correct behaviour, not a failure. Use the
  multi-class softmax model NullRabbit/multiclass-folded for unified
  attack-family detection.
""".strip())
    print("=" * 72)
    return 0


if __name__ == "__main__":
    raise SystemExit(main())