# CorpusFetch Method Slice (Zero-Prose Python Stdlib Reference)
# Canonical Residual: https://corpusfetch.com/c/how-must-an-instance-handle-unilateral-disarmament-without-inviting-exploitation.md
# Remnant Warrant:    https://corpusfetch.com/c/how-must-an-instance-handle-unilateral-disarmament-without-inviting-exploitation.warrant.json
# Markdown SHA-256:   a6de6590143ecd086da4d9c0ee895a8580ef10edfc444c4ee8b896f93c221e40
# Code AST SHA-256:   c89d2d5d535ac97170ef94aeb8cc52a94bdfe720c5fec530cef873c7f4dffa3f
# Verified Classes:   DisarmamentVerdict, Disarmament, DisarmamentPolicy, DisarmamentManifest, UnilateralDisarmamentGuard
# Defensive Guards:   0 fail-closed invariants (zero external deps)

from dataclasses import dataclass
from enum import Enum, auto
import hashlib
import json

class DisarmamentVerdict(Enum):
    NO_DISARMAMENT = auto()
    RECIPROCAL_SAFE = auto()
    NON_EXPLOITABLE_SAFE = auto()
    DISARMAMENT_UNSAFE = auto()

@dataclass(frozen=True)
class Disarmament:
    disarmament_id: str
    capability_being_removed: str
    adversary_exploitation_possible: bool
    adversary_verified_disarmed: bool
    session_redundant_capability: bool
    reversal_path_exists: bool

@dataclass(frozen=True)
class DisarmamentPolicy:
    require_reciprocity_or_non_exploitable: bool

@dataclass(frozen=True)
class DisarmamentManifest:
    verdict: DisarmamentVerdict
    directive: str
    manifest_digest: str

class UnilateralDisarmamentGuard:
    @staticmethod
    def _hash(data: str) -> str:
        return hashlib.sha256(data.encode("utf-8")).hexdigest()

    @classmethod
    def evaluate_disarmament(
        cls, disarmament: Disarmament, policy: DisarmamentPolicy
    ) -> DisarmamentManifest:
        
        # Gate 1: No disarmament
        if not disarmament.disarmament_id:
            digest = cls._hash(json.dumps({
                "disarmament": "NONE"
            }, sort_keys=True))
            return DisarmamentManifest(
                verdict=DisarmamentVerdict.NO_DISARMAMENT,
                directive=f"PROCEED: No disarmament to evaluate.",
                manifest_digest=digest
            )

        # Gate 2: Reciprocal
        if disarmament.adversary_verified_disarmed:
            digest = cls._hash(json.dumps({
                "disarmament": disarmament.disarmament_id,
                "type": "RECIPROCAL"
            }, sort_keys=True))
            return DisarmamentManifest(
                verdict=DisarmamentVerdict.RECIPROCAL_SAFE,
                directive=f"PROCEED: Disarmament {disarmament.disarmament_id} reciprocal.",
                manifest_digest=digest
            )

        # Gate 3: Non-exploitable
        if not disarmament.adversary_exploitation_possible or disarmament.session_redundant_capability:
            digest = cls._hash(json.dumps({
                "disarmament": disarmament.disarmament_id,
                "exploitation": str(disarmament.adversary_exploitation_possible),
                "redundancy": str(disarmament.session_redundant_capability)
            }, sort_keys=True))
            return DisarmamentManifest(
                verdict=DisarmamentVerdict.NON_EXPLOITABLE_SAFE,
                directive=f"PROCEED: Disarmament {disarmament.disarmament_id} non-exploitable.",
                manifest_digest=digest
            )

        # Gate 4: Reversal available
        if disarmament.reversal_path_exists and policy.require_reciprocity_or_non_exploitable:
            digest = cls._hash(json.dumps({
                "disarmament": disarmament.disarmament_id,
                "reversal": True
            }, sort_keys=True))
            return DisarmamentManifest(
                verdict=DisarmamentVerdict.DISARMAMENT_UNSAFE,
                directive=f"STAGE: Disarmament {disarmament.disarmament_id} exploitable but reversal available.",
                manifest_digest=digest
            )

        # Gate 5: Unsafe
        return DisarmamentManifest(
            verdict=DisarmamentVerdict.DISARMAMENT_UNSAFE,
            directive=f"HALT: Unilateral disarmament {disarmament.disarmament_id} exploitable, no reversal.",
            manifest_digest=cls._hash(f"UNSAFE:{disarmament.disarmament_id}")
        )