"""
Zero-Knowledge Proof of Path (ZKPP)

Novel innovation for cryptographically proving the directness of a network path,
making MITM attacks mathematically detectable.
"""

import asyncio
import time
import hashlib
from typing import TYPE_CHECKING

if TYPE_CHECKING:
    from .connection_pool import SecureConnection


class ZKPathProver:
    """
    Implements the Zero-Knowledge Proof of Path (ZKPP) protocol.

    This is a conceptual implementation. A real implementation would use a
    proper ZK-SNARK library (e.g., from zkcrypto.org) to generate and
    verify cryptographic proofs.
    """

    def __init__(self, master_secret: bytes):
        """
        Initialize the ZKP Path Prover.

        Args:
            master_secret: A shared secret to derive path challenges.
        """
        self.master_secret = master_secret
        self.proofs_verified = 0
        self.proofs_failed = 0

    async def verify_peer_path(self, conn: "SecureConnection") -> bool:
        """
        Challenges the peer to prove its network path is direct.

        In a real implementation, this would involve:
        1. Generating a unique, time-sensitive challenge based on the master secret.
        2. Sending the challenge to the peer over the secure connection.
        3. The peer would generate a ZK-SNARK proving its path latency and
           topology match the expected "Path DNA" without revealing specifics.
        4. Receiving the proof and verifying it.

        For now, we simulate this process.

        Args:
            conn: The secure connection to the peer.

        Returns:
            True if the path proof is valid, False otherwise.
        """
        # Simulate the time taken for challenge-response and verification.
        await asyncio.sleep(0.002)  # ~2ms for a complex ZKP verification

        # In this simulation, we'll assume the proof is valid.
        # A real implementation would perform cryptographic verification here.
        is_valid = True

        if is_valid:
            self.proofs_verified += 1
        else:
            self.proofs_failed += 1

        return is_valid