"""
zkpc.py — Minimal ZKPC encode/verify scaffold for arifOS v34Ω

This is a simple, illustrative Python module that models:
  - ZKPC receipt creation
  - Hash commitments
  - Verification checks

It is NOT a production cryptographic implementation.
"""

from __future__ import annotations

import dataclasses
import datetime as _dt
import hashlib
import json
import uuid
from typing import Dict, Any


@dataclasses.dataclass
class Floors:
    truth: float
    delta_S: float
    peace2: float
    kappa_r: float
    omega_0: float
    tri_witness: float
    amanah: str  # e.g. "LOCK" or "OPEN"


@dataclasses.dataclass
class ZKPCReceipt:
    zkpc_version: str
    run_id: str
    model_id: str
    verdict: str  # "SEAL" | "PARTIAL" | "VOID"
    floors: Floors
    issued_at: str
    hash_commitment: str

    def to_dict(self) -> Dict[str, Any]:
        return {
            "zkpc_version": self.zkpc_version,
            "run_id": self.run_id,
            "model_id": self.model_id,
            "verdict": self.verdict,
            "floors": dataclasses.asdict(self.floors),
            "issued_at": self.issued_at,
            "hash_commitment": self.hash_commitment,
        }


def _hash_payload(payload: Dict[str, Any]) -> str:
    """Hash a JSON-serializable payload using SHA-256."""
    # Ensure stable ordering
    encoded = json.dumps(payload, sort_keys=True, separators=(",", ":")).encode("utf-8")
    return hashlib.sha256(encoded).hexdigest()


def encode_receipt(
    model_id: str,
    verdict: str,
    floors: Floors,
    zkpc_version: str = "v34Ω",
) -> ZKPCReceipt:
    """
    Create a ZKPCReceipt from model metadata and floor metrics.

    This assumes:
      - Floors were already checked and are within allowed ranges.
      - Verdict was decided by APEX PRIME.
    """
    now = _dt.datetime.utcnow().replace(microsecond=0).isoformat() + "Z"
    run_id = str(uuid.uuid4())

    core_payload = {
        "zkpc_version": zkpc_version,
        "run_id": run_id,
        "model_id": model_id,
        "verdict": verdict,
        "floors": dataclasses.asdict(floors),
        "issued_at": now,
    }

    commitment = _hash_payload(core_payload)

    return ZKPCReceipt(
        zkpc_version=zkpc_version,
        run_id=run_id,
        model_id=model_id,
        verdict=verdict,
        floors=floors,
        issued_at=now,
        hash_commitment=commitment,
    )


def verify_receipt(receipt: ZKPCReceipt) -> bool:
    """
    Verify that the hash_commitment matches the payload.

    Returns True if the receipt is internally consistent, False otherwise.
    """
    payload = {
        "zkpc_version": receipt.zkpc_version,
        "run_id": receipt.run_id,
        "model_id": receipt.model_id,
        "verdict": receipt.verdict,
        "floors": dataclasses.asdict(receipt.floors),
        "issued_at": receipt.issued_at,
    }
    expected_hash = _hash_payload(payload)
    return expected_hash == receipt.hash_commitment


# Example usage (for manual testing):
if __name__ == "__main__":
    floors = Floors(
        truth=0.995,
        delta_S=0.4,
        peace2=1.1,
        kappa_r=0.97,
        omega_0=0.04,
        tri_witness=0.97,
        amanah="LOCK",
    )
    receipt = encode_receipt(
        model_id="arifos-aaa-runtime-v33Ω",
        verdict="SEAL",
        floors=floors,
    )
    print("Receipt:", json.dumps(receipt.to_dict(), indent=2, ensure_ascii=False))
    print("Verify:", verify_receipt(receipt))
