awoooi/apps/api/src/services/learning_service.py

"""
Learning Service - Phase 5 持續學習迴圈
======================================
ADR-030: 智能自動修復系統
Phase D-G P0 修正: 符合 leWOOOgo 積木化原則

從執行結果中學習，持續優化決策：
1. 更新 Playbook 統計 (成功率/執行次數)
2. 調整信任度 (成功 +分 / 失敗 -分)
3. 萃取新 Playbook (成功案例自動萃取)
4. 處理人工反饋 (有效性評分)
5. 🆕 Redis 持久化學習數據 (透過 Repository)
6. 🆕 修復推薦 (基於歷史成功率)

設計原則:
- 非同步執行，不阻塞主流程
- 失敗容忍，學習失敗不影響執行結果
- 完整審計追蹤
- 🆕 Service 不直接存取 Redis (透過 ILearningRepository)

版本: v1.1
建立: 2026-03-26 (台北時區)
更新: 2026-03-29 (台北時區) - P0 修正: 新增 Repository 層
"""

from dataclasses import dataclass, field
from datetime import UTC, datetime
from enum import Enum
from typing import Any

import structlog

from src.models.approval import ApprovalRequest
from src.models.incident import IncidentStatus
from src.repositories.interfaces import ILearningRepository, ITrustRepository
from src.repositories.learning_repository import get_learning_repository
from src.repositories.trust_repository import get_trust_repository
from src.services.trust_engine import get_trust_manager

logger = structlog.get_logger(__name__)


# =============================================================================
# Constants
# =============================================================================


class FeedbackType(str, Enum):
    """反饋類型"""

    EXECUTION_SUCCESS = "execution_success"  # 執行成功
    EXECUTION_FAILURE = "execution_failure"  # 執行失敗
    HUMAN_APPROVE = "human_approve"  # 人工批准
    HUMAN_REJECT = "human_reject"  # 人工拒絕
    HUMAN_OVERRIDE = "human_override"  # 人工覆蓋 AI 決策
    EFFECTIVENESS_RATING = "effectiveness_rating"  # 有效性評分


# 信任度調整參數
TRUST_SUCCESS_BOOST = 1  # 成功 +1 分
TRUST_FAILURE_PENALTY = 2  # 失敗 -2 分 (或歸零)
TRUST_HUMAN_REJECT_PENALTY = 1  # 人工拒絕 -1 分


# =============================================================================
# Data Models
# =============================================================================


@dataclass
class ExecutionResult:
    """執行結果"""

    approval_id: str
    incident_id: str
    action: str
    success: bool
    error_message: str | None = None
    duration_seconds: float = 0.0
    executed_at: datetime = field(default_factory=lambda: datetime.now(UTC))

    def to_dict(self) -> dict[str, Any]:
        return {
            "approval_id": self.approval_id,
            "incident_id": self.incident_id,
            "action": self.action,
            "success": self.success,
            "error_message": self.error_message,
            "duration_seconds": self.duration_seconds,
            "executed_at": self.executed_at.isoformat(),
        }


@dataclass
class FeedbackRequest:
    """人工反饋請求"""

    incident_id: str
    feedback_type: FeedbackType
    effectiveness_score: int | None = None  # 1-5 分
    learning_notes: str | None = None  # 學習筆記
    submitted_by: str | None = None
    submitted_at: datetime = field(default_factory=lambda: datetime.now(UTC))


@dataclass
class LearningRecord:
    """學習記錄"""

    incident_id: str
    feedback_type: FeedbackType
    action_pattern: str
    trust_before: int
    trust_after: int
    playbook_updated: bool = False
    new_playbook_id: str | None = None
    learned_at: datetime = field(default_factory=lambda: datetime.now(UTC))

    def to_dict(self) -> dict[str, Any]:
        return {
            "incident_id": self.incident_id,
            "feedback_type": self.feedback_type.value,
            "action_pattern": self.action_pattern,
            "trust_before": self.trust_before,
            "trust_after": self.trust_after,
            "playbook_updated": self.playbook_updated,
            "new_playbook_id": self.new_playbook_id,
            "learned_at": self.learned_at.isoformat(),
        }


# =============================================================================
# Learning Service
# =============================================================================


class LearningService:
    """
    持續學習服務

    職責:
    1. 處理執行結果 → 更新 Playbook + 信任度
    2. 處理人工反饋 → 調整 Playbook 有效性
    3. 萃取新 Playbook (成功案例)
    4. 🆕 Redis 持久化學習數據 (透過 Repository)
    5. 🆕 修復推薦 (基於歷史成功率)

    2026-03-29 P0 修正: 符合 leWOOOgo 積木化原則
    - 透過 ILearningRepository 存取 Redis
    - 不直接依賴 Redis Client
    """

    # 推薦門檻
    MIN_SAMPLES = 5  # 最少需要 N 次數據才能推薦
    SUCCESS_RATE_THRESHOLD = 0.6  # 成功率門檻

    def __init__(
        self,
        repository: ILearningRepository | None = None,
        trust_repository: ITrustRepository | None = None,
    ):
        self._trust_manager = get_trust_manager()
        self._repository = repository or get_learning_repository()
        self._trust_repo = trust_repository or get_trust_repository()

    async def process_execution_result(
        self,
        approval: ApprovalRequest,
        result: ExecutionResult,
    ) -> LearningRecord:
        """
        處理執行結果，觸發學習

        Args:
            approval: 原始審批請求
            result: 執行結果

        Returns:
            LearningRecord: 學習記錄
        """
        action_pattern = self._extract_action_pattern(approval.action)

        # 取得當前信任分數
        trust_record = self._trust_manager.get_trust_record(action_pattern)
        trust_before = trust_record.score if trust_record else 0

        # 1. 調整信任度
        if result.success:
            # 成功: 記錄批准 (信任分數 +1)
            self._trust_manager.record_approval(
                action_pattern=action_pattern,
                user_role="system",
                user_id="auto_learning",
            )
            feedback_type = FeedbackType.EXECUTION_SUCCESS
        else:
            # 失敗: 記錄拒絕 (信任分數歸零)
            self._trust_manager.record_rejection(
                action_pattern=action_pattern,
                user_role="system",
                user_id="auto_learning",
                reason=result.error_message,
            )
            feedback_type = FeedbackType.EXECUTION_FAILURE

        # ADR-088: 持久化信任分數到 PostgreSQL (Pod 重啟後不歸零)
        await self._persist_trust(action_pattern)

        # 取得更新後的信任分數
        trust_record = self._trust_manager.get_trust_record(action_pattern)
        trust_after = trust_record.score if trust_record else 0

        # 2. 更新 Playbook 統計 (如果有匹配)
        # ADR-083 Phase 3: 雙路徑查找 matched_playbook_id
        # 路徑 A: ApprovalRequest.matched_playbook_id（auto_execute 路徑，Phase 3 修復）
        # 路徑 B: approval.metadata["playbook_id"]（人工審核路徑，透過 proposal_service 存入 metadata）
        # 2026-04-15 ogt + Claude Sonnet 4.6（亞太）: Phase 3 Playbook EWMA 修復
        _matched_pb_id: str | None = (
            getattr(approval, "matched_playbook_id", None)
            or (approval.metadata or {}).get("matched_playbook_id")
            or (approval.metadata or {}).get("playbook_id")
        )
        playbook_updated = False
        if _matched_pb_id:
            try:
                await self._update_playbook_stats(
                    playbook_id=_matched_pb_id,
                    success=result.success,
                )
                playbook_updated = True
            except Exception as e:
                logger.warning(
                    "playbook_stats_update_failed",
                    playbook_id=_matched_pb_id,
                    error=str(e),
                )

        # 3. 嘗試萃取新 Playbook (成功且無匹配 Playbook)
        new_playbook_id = None
        if result.success and not _matched_pb_id:
            try:
                new_playbook_id = await self._try_extract_playbook(
                    incident_id=result.incident_id,
                    action=approval.action,
                )
            except Exception as e:
                logger.warning(
                    "playbook_extraction_failed",
                    incident_id=result.incident_id,
                    error=str(e),
                )

        # 建立學習記錄
        record = LearningRecord(
            incident_id=result.incident_id,
            feedback_type=feedback_type,
            action_pattern=action_pattern,
            trust_before=trust_before,
            trust_after=trust_after,
            playbook_updated=playbook_updated,
            new_playbook_id=new_playbook_id,
        )

        logger.info(
            "learning_completed",
            incident_id=result.incident_id,
            success=result.success,
            trust_change=f"{trust_before} → {trust_after}",
            playbook_updated=playbook_updated,
            new_playbook=new_playbook_id,
        )

        return record

    async def process_human_feedback(
        self,
        feedback: FeedbackRequest,
    ) -> LearningRecord:
        """
        處理人工反饋

        Args:
            feedback: 反饋請求

        Returns:
            LearningRecord: 學習記錄
        """
        # 從 incident 取得 action pattern (需查詢)
        action_pattern = f"incident:{feedback.incident_id}"

        trust_record = self._trust_manager.get_trust_record(action_pattern)
        trust_before = trust_record.score if trust_record else 0

        playbook_updated = False

        if feedback.feedback_type == FeedbackType.HUMAN_APPROVE:
            # 人工批准: 信任 +1
            self._trust_manager.record_approval(
                action_pattern=action_pattern,
                user_role="human",
                user_id=feedback.submitted_by,
            )

        elif feedback.feedback_type == FeedbackType.HUMAN_REJECT:
            # 人工拒絕: 信任歸零
            self._trust_manager.record_rejection(
                action_pattern=action_pattern,
                user_role="human",
                user_id=feedback.submitted_by,
                reason="Human rejected",
            )

        elif feedback.feedback_type == FeedbackType.EFFECTIVENESS_RATING:
            # 有效性評分
            if feedback.effectiveness_score is not None:
                if feedback.effectiveness_score >= 4:
                    # 高評分: 增加信任
                    self._trust_manager.record_approval(
                        action_pattern=action_pattern,
                        user_role="feedback",
                        user_id=feedback.submitted_by,
                    )
                    playbook_updated = await self._promote_playbook(feedback.incident_id)
                elif feedback.effectiveness_score <= 2:
                    # 低評分: 降低信任
                    self._trust_manager.record_rejection(
                        action_pattern=action_pattern,
                        user_role="feedback",
                        user_id=feedback.submitted_by,
                        reason=f"Low effectiveness score: {feedback.effectiveness_score}",
                    )
                    playbook_updated = await self._demote_playbook(feedback.incident_id)

        # ADR-088: 持久化信任分數到 PostgreSQL (Pod 重啟後不歸零)
        await self._persist_trust(action_pattern)

        trust_record = self._trust_manager.get_trust_record(action_pattern)
        trust_after = trust_record.score if trust_record else 0

        record = LearningRecord(
            incident_id=feedback.incident_id,
            feedback_type=feedback.feedback_type,
            action_pattern=action_pattern,
            trust_before=trust_before,
            trust_after=trust_after,
            playbook_updated=playbook_updated,
        )

        logger.info(
            "human_feedback_processed",
            incident_id=feedback.incident_id,
            feedback_type=feedback.feedback_type.value,
            effectiveness_score=feedback.effectiveness_score,
            trust_change=f"{trust_before} → {trust_after}",
        )

        return record

    # =========================================================================
    # Private Methods
    # =========================================================================

    def _extract_action_pattern(self, action: str) -> str:
        """從 action 字串提取 pattern"""
        if not action:
            return "unknown"

        parts = action.split()
        if len(parts) < 3:
            return "unknown"

        verb = parts[1] if len(parts) > 1 else "unknown"
        resource_part = parts[2] if len(parts) > 2 else ""

        if "/" in resource_part:
            resource_name = resource_part.split("/")[-1]
        else:
            resource_name = resource_part

        # 移除 pod hash suffix
        resource_parts = resource_name.split("-")
        if len(resource_parts) >= 3:
            resource_name = "-".join(resource_parts[:-2]) + "-*"

        return f"{verb}:{resource_name}"

    async def _update_playbook_stats(
        self,
        playbook_id: str,
        success: bool,
    ) -> None:
        """更新 Playbook 統計"""
        try:
            from src.services.playbook_service import get_playbook_service

            service = get_playbook_service()
            await service.record_execution(playbook_id, success)

        except Exception as e:
            logger.warning(
                "playbook_stats_update_error",
                playbook_id=playbook_id,
                error=str(e),
            )

    async def _try_extract_playbook(
        self,
        incident_id: str,
        action: str,
    ) -> str | None:
        """嘗試從成功案例萃取 Playbook"""
        try:
            from src.repositories.incident_repository import get_incident_repository
            from src.services.playbook_service import get_playbook_service

            # 取得 Incident
            repo = get_incident_repository()
            incident = await repo.get_by_id(incident_id)

            if not incident:
                return None

            # 確認狀態為 RESOLVED
            if incident.status not in [IncidentStatus.RESOLVED, IncidentStatus.CLOSED]:
                return None

            # 萃取 Playbook
            service = get_playbook_service()
            playbook = await service.extract_from_incident(
                incident=incident,
                auto_approve=False,  # 需人工審核
            )

            if playbook:
                logger.info(
                    "playbook_auto_extracted",
                    incident_id=incident_id,
                    playbook_id=playbook.playbook_id,
                )
                return playbook.playbook_id

            return None

        except Exception as e:
            logger.warning(
                "playbook_extraction_error",
                incident_id=incident_id,
                error=str(e),
            )
            return None

    async def _promote_playbook(self, incident_id: str) -> bool:
        """
        提升 Playbook 信心度 (高評分)

        2026-03-30 Claude Code: 實作信心度提升邏輯

        邏輯:
        - 尋找 source_incident_ids 包含此 incident_id 的 Playbooks
        - 提升 ai_confidence +0.1 (上限 1.0)
        - 若信心度 >= 0.9 且 status == DRAFT → 自動升級為 APPROVED
        """
        try:
            from src.repositories.playbook_repository import get_playbook_repository

            repo = get_playbook_repository()
            playbooks = await repo.find_by_source_incident(incident_id)

            if not playbooks:
                logger.debug(
                    "playbook_promote_no_match",
                    incident_id=incident_id,
                )
                return False

            # 信心度提升參數
            CONFIDENCE_BOOST = 0.1

            updated_count = 0
            for playbook in playbooks:
                result = await repo.adjust_confidence(
                    playbook_id=playbook.playbook_id,
                    delta=CONFIDENCE_BOOST,
                    reason=f"High effectiveness rating from incident {incident_id}",
                )
                if result:
                    updated_count += 1

            logger.info(
                "playbook_promoted",
                incident_id=incident_id,
                updated_count=updated_count,
                total_playbooks=len(playbooks),
            )

            return updated_count > 0

        except Exception as e:
            logger.warning(
                "playbook_promote_failed",
                incident_id=incident_id,
                error=str(e),
            )
            return False

    async def _demote_playbook(self, incident_id: str) -> bool:
        """
        降低 Playbook 信心度 (低評分)

        2026-03-30 Claude Code: 實作信心度降低邏輯

        邏輯:
        - 尋找 source_incident_ids 包含此 incident_id 的 Playbooks
        - 降低 ai_confidence -0.15 (下限 0.0)
        - 若信心度 < 0.3 且 failure_rate > 50% → 自動降級為 DEPRECATED
        """
        try:
            from src.repositories.playbook_repository import get_playbook_repository

            repo = get_playbook_repository()
            playbooks = await repo.find_by_source_incident(incident_id)

            if not playbooks:
                logger.debug(
                    "playbook_demote_no_match",
                    incident_id=incident_id,
                )
                return False

            # 信心度降低參數 (懲罰比獎勵更重，避免低品質 Playbook 累積)
            CONFIDENCE_PENALTY = -0.15

            updated_count = 0
            for playbook in playbooks:
                result = await repo.adjust_confidence(
                    playbook_id=playbook.playbook_id,
                    delta=CONFIDENCE_PENALTY,
                    reason=f"Low effectiveness rating from incident {incident_id}",
                )
                if result:
                    updated_count += 1

            logger.info(
                "playbook_demoted",
                incident_id=incident_id,
                updated_count=updated_count,
                total_playbooks=len(playbooks),
            )

            return updated_count > 0

        except Exception as e:
            logger.warning(
                "playbook_demote_failed",
                incident_id=incident_id,
                error=str(e),
            )
            return False

    # =========================================================================
    # 🆕 Phase D-G P0 修正: 新增方法
    # =========================================================================

    async def record_repair_result(
        self,
        anomaly_key: str,
        repair_action: str,
        success: bool,
        root_cause: str | None = None,
        fix_description: str | None = None,
        execution_time_seconds: float | None = None,
    ) -> bool:
        """
        記錄修復結果到 Repository (Redis 持久化)

        2026-03-29 P0 修正: 透過 Repository 存取 Redis

        Args:
            anomaly_key: 異常 key
            repair_action: 修復動作
            success: 是否成功
            root_cause: 根因 (如果找到)
            fix_description: 修復說明
            execution_time_seconds: 執行時間

        Returns:
            bool: 是否成功記錄
        """
        return await self._repository.record_repair(
            anomaly_key=anomaly_key,
            repair_action=repair_action,
            success=success,
            root_cause=root_cause,
            fix_description=fix_description,
            execution_time_seconds=execution_time_seconds,
        )

    async def record_declarative_outcome(
        self,
        incident_id: str,
        action: str,
        blast_radius_score: int,
        blast_radius_tier: str,
        success: bool,
        rollback_triggered: bool = False,
        execution_time_seconds: float | None = None,
    ) -> bool:
        """
        記錄 DeclarativeSpec 執行結果到學習系統。

        Phase 5 ADR-086：DeclarativeSpec 執行結果寫入學習記錄，
        讓 AI 能從 Blast Radius 分級的執行歷史中學習。

        Args:
            incident_id:           關聯 Incident ID
            action:                執行的 kubectl 命令
            blast_radius_score:    爆炸半徑分數（0-100）
            blast_radius_tier:     執行分級（auto/human/dual/blocked）
            success:               是否執行成功
            rollback_triggered:    是否觸發了回滾
            execution_time_seconds: 執行耗時

        Returns:
            bool: 是否成功記錄

        2026-04-15 ogt + Claude Sonnet 4.6（亞太）: Phase 5 初始建立
        """
        import json
        from src.utils.timezone import now_taipei

        try:
            anomaly_key = f"declarative:{incident_id}"
            fix_desc = json.dumps({
                "blast_radius_score": blast_radius_score,
                "blast_radius_tier": blast_radius_tier,
                "rollback_triggered": rollback_triggered,
                "recorded_at": now_taipei().isoformat(),
            }, ensure_ascii=False)

            return await self._repository.record_repair(
                anomaly_key=anomaly_key,
                repair_action=action[:200],
                success=success,
                root_cause=f"blast_radius_tier={blast_radius_tier}",
                fix_description=fix_desc,
                execution_time_seconds=execution_time_seconds,
            )
        except Exception as e:
            import structlog as _structlog
            _structlog.get_logger(__name__).warning(
                "record_declarative_outcome_failed",
                incident_id=incident_id,
                error=str(e),
            )
            return False

    async def record_diagnosis_outcome(
        self,
        incident_id: str,
        matched_playbook_id: str | None,
        was_correct: bool,
        actual_fix: str | None = None,
    ) -> None:
        """
        記錄 AI 診斷結果的正確性。

        ADR-083 Phase 3: 誤診回寫 playbook_diagnosis_feedback（L3×D4）。
        當 AI 提議被人工拒絕、或執行後驗證失敗，代表診斷可能有誤；
        此時回寫負向信號，讓對應 Playbook trust_score EWMA 收縮。

        Args:
            incident_id:           關聯 Incident ID
            matched_playbook_id:   此次診斷使用的 Playbook ID（若有）
            was_correct:           診斷是否正確（False = 誤診）
            actual_fix:            實際有效的修復動作（可供 Evolver 學習）

        2026-04-15 ogt + Claude Sonnet 4.6（亞太）: Phase 3 誤診回饋接線
        """
        # 1. 記錄到 Repository（diag: 前綴與 exec: / verify: 區分）
        try:
            await self._repository.record_repair(
                anomaly_key=f"diag:{incident_id}",
                repair_action=actual_fix or "unknown",
                success=was_correct,
                fix_description=f"diagnosis_correct={was_correct}",
            )
        except Exception as e:
            logger.warning(
                "record_diagnosis_to_repo_failed",
                incident_id=incident_id,
                error=str(e),
            )

        # 2. 誤診時強化 Playbook 負向學習（已有 2x EWMA 衰減係數）
        if matched_playbook_id and not was_correct:
            await self._update_playbook_stats(
                playbook_id=matched_playbook_id,
                success=False,
            )

        logger.info(
            "diagnosis_outcome_recorded",
            incident_id=incident_id,
            was_correct=was_correct,
            matched_playbook_id=matched_playbook_id,
        )

    async def record_verification_result(
        self,
        incident_id: str,
        action_taken: str,
        verification_result: str,
        matched_playbook_id: str | None = None,
    ) -> None:
        """
        記錄環境驗證結果到學習系統。

        ADR-083 Phase 3 Root cause 3: post_execution_verifier → learning 接線修復。
        環境驗證（Pod Running / 指標恢復）比執行指令 exit code 更精確，
        單獨存一條 verify: 前綴記錄，並更新 Playbook EWMA stats。

        Args:
            incident_id:           關聯 Incident ID
            action_taken:          執行的動作描述（例如 "restart_service:awoooi-api"）
            verification_result:   "success" | "degraded" | "failed" | "timeout"
            matched_playbook_id:   匹配的 Playbook ID（有則更新 EWMA stats）

        2026-04-15 ogt + Claude Sonnet 4.6（亞太）: Phase 3 Root cause 3 修復
        """
        success = (verification_result == "success")

        # 1. 記錄環境驗證結果到 Repository（anomaly_key 加 verify: 前綴與執行記錄區分）
        try:
            await self._repository.record_repair(
                anomaly_key=f"verify:{incident_id}",
                repair_action=action_taken,
                success=success,
                fix_description=verification_result,
            )
        except Exception as e:
            logger.warning(
                "record_verification_to_repo_failed",
                incident_id=incident_id,
                error=str(e),
            )

        # 2. 更新 Playbook EWMA stats（比執行 exit code 更精確的訊號）
        if matched_playbook_id:
            await self._update_playbook_stats(
                playbook_id=matched_playbook_id,
                success=success,
            )

        logger.info(
            "verification_result_recorded",
            incident_id=incident_id,
            verification_result=verification_result,
            matched_playbook_id=matched_playbook_id,
        )

    async def record_agent_session(
        self,
        session_id: str,
        incident_id: str,
        final_confidence: float,
        requires_human_approval: bool,
        all_agents_degraded: bool,
        critic_challenge_count: int,
        matched_playbook_id: str | None = None,
    ) -> None:
        """
        記錄 5-Agent 辯證 Session 的學習訊號。

        ADR-083 Phase 3: AgentSession 學習接線（L7×D2）。
        DB 持久化由 agent_orchestrator._write_agent_turn() 負責，
        此方法負責從辯證結果提取學習訊號（Redis analytics + Playbook EWMA）。

        信號邏輯：
        - all_agents_degraded=True → 系統品質警報（記錄到 Redis governance）
        - critic_challenge_count > 0 AND matched_playbook_id → 輕度負向 EWMA（Critic 質疑 Playbook）
        - requires_human_approval=True → 信心不足，系統整體品質下降紀錄

        Args:
            session_id:                辯證 Session ID
            incident_id:               關聯 Incident ID
            final_confidence:          Coordinator 最終信心分數（0-1）
            requires_human_approval:   是否升級人工審核
            all_agents_degraded:       是否全部 Agent 降級
            critic_challenge_count:    Critic 提出的質疑數量
            matched_playbook_id:       本次決策匹配的 Playbook（若有）

        2026-04-15 ogt + Claude Sonnet 4.6（亞太）: Phase 3 AgentSession 學習接線
        """
        # 1. 記錄辯證品質到 Redis（供 SLO 監控 + Governance 分析）
        try:
            await self._repository.record_repair(
                anomaly_key=f"debate:{incident_id}",
                repair_action=f"session:{session_id[:8]}",
                success=not requires_human_approval,
                fix_description=f"confidence={final_confidence:.2f},degraded={all_agents_degraded},critic_challenges={critic_challenge_count}",
            )
        except Exception as e:
            logger.warning(
                "record_agent_session_to_repo_failed",
                session_id=session_id,
                error=str(e),
            )

        # 2. Critic 有重大質疑 + 有匹配 Playbook → 輕度負向 EWMA（Playbook 可能不準確）
        if critic_challenge_count > 0 and matched_playbook_id:
            await self._update_playbook_stats(
                playbook_id=matched_playbook_id,
                success=False,
            )

        logger.info(
            "agent_session_recorded",
            session_id=session_id,
            incident_id=incident_id,
            final_confidence=final_confidence,
            requires_human_approval=requires_human_approval,
            all_agents_degraded=all_agents_degraded,
            critic_challenge_count=critic_challenge_count,
        )

    async def get_recommended_fix(self, anomaly_key: str) -> dict:
        """
        根據歷史學習，推薦最佳修復方案

        2026-03-29 P0 修正: 使用 Repository 取得統計

        Returns:
            {
                'action': 'scale_up',
                'confidence': 0.85,
                'tier': 2,
                'based_on': '12 次歷史數據',
                'avg_execution_time': 45.2,
                'alternatives': [...]
            }
        """
        import math

        all_stats = await self._repository.get_all_repair_stats(anomaly_key)

        if not all_stats:
            return self._default_recommendation()

        # 計算各動作的加權分數
        scored_actions = []
        for action, stats in all_stats.items():
            if stats["total"] >= self.MIN_SAMPLES:
                success_rate = stats["success_rate"]
                if success_rate >= self.SUCCESS_RATE_THRESHOLD:
                    # 加權: 成功率 * log(樣本數)
                    score = success_rate * math.log(stats["total"] + 1)

                    # 取得平均執行時間
                    history = await self._repository.get_repair_history(
                        anomaly_key, action, limit=20
                    )
                    times = [
                        h["execution_time"]
                        for h in history
                        if h.get("execution_time")
                    ]
                    avg_time = sum(times) / len(times) if times else 0.0

                    scored_actions.append({
                        "action": action,
                        "score": score,
                        "success_rate": success_rate,
                        "total_samples": stats["total"],
                        "tier": self._get_action_tier(action),
                        "avg_execution_time": avg_time,
                    })

        if not scored_actions:
            return self._default_recommendation()

        # 排序: 優先高成功率，其次低 Tier
        scored_actions.sort(key=lambda x: (-x["score"], x["tier"]))

        best = scored_actions[0]
        alternatives = scored_actions[1:3] if len(scored_actions) > 1 else []

        return {
            "action": best["action"],
            "confidence": 0.0,  # 🔴 歷史學習不是 AI 分析，信心度設 0
            "tier": best["tier"],
            "based_on": f"{best['total_samples']} 次歷史數據",
            "avg_execution_time": best["avg_execution_time"],
            "success_rate": best["success_rate"],  # 保留原始成功率作為參考
            "alternatives": [
                {"action": a["action"], "confidence": 0.0, "success_rate": a["success_rate"], "tier": a["tier"]}
                for a in alternatives
            ],
        }

    async def get_learning_summary(self, anomaly_key: str) -> dict:
        """
        取得學習摘要

        Phase 22 P2: 業務邏輯移至 Service 層
        2026-03-31 Claude Code (首席架構師技術債修復)

        邏輯:
        - 從 Repository 取得原始統計數據
        - 在 Service 層計算 best_action 和 learning_status

        Returns:
            {
                'anomaly_key': 'abc123',
                'total_repair_attempts': 8,
                'overall_success_rate': 0.625,
                'actions_tried': ['restart_pod', 'scale_up'],
                'best_action': {'action': 'scale_up', 'success_rate': 0.75},
                'learning_status': 'sufficient',
            }
        """
        # 從 Repository 取得原始統計
        all_stats = await self._repository.get_all_repair_stats(anomaly_key)

        if not all_stats:
            return {
                "anomaly_key": anomaly_key,
                "total_repair_attempts": 0,
                "overall_success_rate": 0.0,
                "actions_tried": [],
                "best_action": None,
                "learning_status": "insufficient",
            }

        # === 以下為業務邏輯，應在 Service 層 ===

        total_attempts = sum(s["total"] for s in all_stats.values())
        total_success = sum(s["success"] for s in all_stats.values())
        overall_rate = total_success / total_attempts if total_attempts > 0 else 0.0

        # 找出最佳動作 (需要至少 3 次數據)
        best_action = None
        best_rate = 0.0
        for action, stats in all_stats.items():
            if stats["total"] >= 3 and stats["success_rate"] > best_rate:
                best_rate = stats["success_rate"]
                best_action = {"action": action, "success_rate": best_rate}

        # 判斷學習狀態
        if total_attempts < 3:
            learning_status = "insufficient"
        elif total_attempts < 10:
            learning_status = "learning"
        elif overall_rate >= 0.8:
            learning_status = "excellent"
        else:
            learning_status = "sufficient"

        return {
            "anomaly_key": anomaly_key,
            "total_repair_attempts": total_attempts,
            "overall_success_rate": overall_rate,
            "actions_tried": list(all_stats.keys()),
            "best_action": best_action,
            "learning_status": learning_status,
        }

    async def _persist_trust(self, action_pattern: str) -> None:
        """
        将内存中的 TrustRecord 持久化到 PostgreSQL。

        ADR-088: 每次 approve/reject 後同步寫入 DB，
        確保 Pod 重啟後信任分數不歸零。

        2026-04-17 ogt + Claude Sonnet 4.6（亞太）: Phase 4 信任持久化
        """
        record = self._trust_manager.get_trust_record(action_pattern)
        if not record:
            return
        try:
            await self._trust_repo.upsert(
                action_pattern=action_pattern,
                score=record.score,
                total_approvals=record.total_approvals,
                total_rejections=record.total_rejections,
                last_approval_by=record.last_approval_by,
                last_approval_at=record.last_approval_at,
                last_rejection_by=record.last_rejection_by,
                last_rejection_at=record.last_rejection_at,
            )
        except Exception as e:
            logger.warning(
                "trust_persist_failed",
                action_pattern=action_pattern,
                error=str(e),
            )

    def _get_action_tier(self, action: str) -> int:
        """取得動作的 Tier"""
        tier_actions = {
            1: ["restart_pod", "restart_container", "delete_pod"],
            2: ["scale_up", "increase_memory", "increase_cpu", "adjust_limits"],
            3: ["apply_hotfix", "update_config", "patch_deployment", "rollback"],
            4: ["create_issue", "notify_team", "schedule_fix", "manual_intervention"],
        }
        for tier, actions in tier_actions.items():
            if action in actions:
                return tier
        return 1  # 預設 Tier 1

    def _default_recommendation(self) -> dict:
        """預設推薦 (無歷史數據時)"""
        return {
            "action": "restart_pod",
            "confidence": 0.0,  # 🔴 預設推薦不是 AI 分析，信心度設 0
            "tier": 1,
            "based_on": "無歷史數據，使用預設",
            "avg_execution_time": 30.0,
            "alternatives": [
                {"action": "delete_pod", "confidence": 0.0, "tier": 1},
            ],
        }


# =============================================================================
# Singleton
# =============================================================================

_learning_service: LearningService | None = None


def get_learning_service() -> LearningService:
    """取得學習服務 singleton"""
    global _learning_service
    if _learning_service is None:
        _learning_service = LearningService()
    return _learning_service