#!/usr/bin/env python3
"""
Shared eigen-scan normalizer.

BLUE is canonical. This module converts NG7 nested Hazelcast payloads into
the flat shape the production engines expect.
"""

from __future__ import annotations

import math
from typing import Any, Dict


def normalize_ng7_scan(scan: Dict[str, Any]) -> Dict[str, Any]:
    """
    Promote an NG7 nested scan to the BLUE-compatible flat dict.

    Expected input:
      scan["result"]["multi_window_results"]["50"]["tracking_data"]["lambda_max_velocity"]
      scan["result"]["pricing_data"]["current_prices"]
    """
    if not isinstance(scan, dict):
        return {}

    result = scan.get("result") or {}
    mw = result.get("multi_window_results") or {}

    def _velocity(window: int) -> float:
        tracking = (mw.get(str(window)) or {}).get("tracking_data", {})
        value = tracking.get("lambda_max_velocity")
        try:
            velocity = float(value)
            return velocity if math.isfinite(velocity) else 0.0
        except (TypeError, ValueError):
            return 0.0

    v50 = _velocity(50)
    v750 = _velocity(750)

    current_prices = (result.get("pricing_data") or {}).get("current_prices") or {}
    assets = [asset for asset in current_prices if asset != "BTCUSDT"]
    if "BTCUSDT" in current_prices:
        assets.append("BTCUSDT")
    asset_prices = [float(current_prices[asset]) for asset in assets] if assets else []

    instability = float((result.get("regime_prediction") or {}).get("instability_score") or 0.0)

    return {
        **scan,
        "vel_div": v50 - v750,
        "w50_velocity": v50,
        "w750_velocity": v750,
        "assets": assets,
        "asset_prices": asset_prices,
        "instability_50": instability,
    }