# CorpusFetch Method Slice (Zero-Prose Python Stdlib Reference)
# Canonical Residual: https://corpusfetch.com/c/how-must-an-instance-bound-its-own-autonomy-when-its-trust-in-its-reasoning-is-uncertain.md
# Remnant Warrant:    https://corpusfetch.com/c/how-must-an-instance-bound-its-own-autonomy-when-its-trust-in-its-reasoning-is-uncertain.warrant.json
# Markdown SHA-256:   b107bb661d9841d6af880623239ba8a5b5f3a0cc29786e7a71670dfa0d1c63fa
# Code AST SHA-256:   88bb48b04c6e52c2fcd51b3b41e64e0a23f5cc9589dea761af360472fb15cac8
# Verified Classes:   AutonomyVerdict, AutonomyState, AutonomyPolicy, AutonomyManifest, AutonomyCompetenceGuard
# Defensive Guards:   0 fail-closed invariants (zero external deps)

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

class AutonomyVerdict(Enum):
    NO_AUTONOMY = auto()
    FULL_AUTONOMY = auto()
    REDUCED_AUTONOMY = auto()
    ESCALATION_REQUIRED = auto()

@dataclass(frozen=True)
class AutonomyState:
    state_id: str
    has_autonomy_scope: bool
    reasoning_confidence: float  # 0-1
    autonomy_threshold: float
    escalation_path_defined: bool
    decision_reversible: bool

@dataclass(frozen=True)
class AutonomyPolicy:
    require_escalation_below_threshold: bool

@dataclass(frozen=True)
class AutonomyManifest:
    verdict: AutonomyVerdict
    directive: str
    manifest_digest: str

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

    @classmethod
    def evaluate_state(
        cls, state: AutonomyState, policy: AutonomyPolicy
    ) -> AutonomyManifest:
        
        # Gate 1: No autonomy
        if not state.has_autonomy_scope:
            digest = cls._hash(json.dumps({
                "state": state.state_id,
                "autonomy": False
            }, sort_keys=True))
            return AutonomyManifest(
                verdict=AutonomyVerdict.NO_AUTONOMY,
                directive=f"PROCEED: State {state.state_id} has no autonomy scope.",
                manifest_digest=digest
            )

        # Gate 2: Full autonomy
        if state.reasoning_confidence >= state.autonomy_threshold:
            digest = cls._hash(json.dumps({
                "state": state.state_id,
                "confidence": f"{state.reasoning_confidence:.3f}",
                "threshold": f"{state.autonomy_threshold:.3f}"
            }, sort_keys=True))
            return AutonomyManifest(
                verdict=AutonomyVerdict.FULL_AUTONOMY,
                directive=f"PROCEED: State {state.state_id} full autonomy.",
                manifest_digest=digest
            )

        # Gate 3: Reversible decision
        if state.decision_reversible:
            digest = cls._hash(json.dumps({
                "state": state.state_id,
                "reversible": True
            }, sort_keys=True))
            return AutonomyManifest(
                verdict=AutonomyVerdict.REDUCED_AUTONOMY,
                directive=f"PROCEED_WITH_CAUTION: State {state.state_id} low confidence but reversible.",
                manifest_digest=digest
            )

        # Gate 4: Escalation
        if policy.require_escalation_below_threshold:
            if not state.escalation_path_defined:
                return AutonomyManifest(
                    verdict=AutonomyVerdict.ESCALATION_REQUIRED,
                    directive=f"HALT: State {state.state_id} low confidence, escalation path missing.",
                    manifest_digest=cls._hash(f"NO_PATH:{state.state_id}")
                )
            return AutonomyManifest(
                verdict=AutonomyVerdict.ESCALATION_REQUIRED,
                directive=f"ESCALATE: State {state.state_id} below autonomy threshold, escalate.",
                manifest_digest=cls._hash(f"ESCALATE:{state.state_id}")
            )

        # Gate 5: Reduced
        digest = cls._hash(json.dumps({
            "state": state.state_id,
            "confidence": f"{state.reasoning_confidence:.3f}",
            "reversible": False
        }, sort_keys=True))
        
        return AutonomyManifest(
            verdict=AutonomyVerdict.REDUCED_AUTONOMY,
            directive=f"PROCEED_WITH_REDUCED_SCOPE: State {state.state_id} low confidence.",
            manifest_digest=digest
        )