"""
Zero-knowledge proof system for agmem (stub).

Planned: zk-SNARKs (Groth16) for keyword containment, memory freshness, competence verification.
Requires optional zk extra (circuit lib, proving system). Trusted setup: public ceremony or small multi-party.
"""

from pathlib import Path
from typing import Optional, Tuple


def prove_keyword_containment(memory_path: Path, keyword: str, output_proof_path: Path) -> bool:
    """Prove memory file contains keyword without revealing content. Stub: returns False until zk backend added."""
    return False


def prove_memory_freshness(
    memory_path: Path, after_timestamp: str, output_proof_path: Path
) -> bool:
    """Prove memory was updated after date without revealing content. Stub: returns False until zk backend added."""
    return False


def verify_proof(proof_path: Path, statement_type: str, **kwargs) -> bool:
    """Verify a zk proof. Stub: returns False until zk backend added."""
    return False
