"""控制面序列化器与共享工具函数。

从原 ``dispatch_stage.py`` 模块级函数抽取，按域分组。所有函数行为
零变更，仅迁移到独立模块便于维护。包括：

- 通用工具：``dataclass_to_dict`` / ``_requireParam`` / ``_requireAccountId``
  / ``_coerceQueryDateTime`` / ``_coerceChannelType`` / ``_coerceAccountStatus``
  / ``_coerceSessionStatus``
- config 域：``_configValueToDict`` / ``_configFieldToDict`` / ``_normalizeConfigEntries``
- session 域：``_channelSessionToDict``
- message 域：``_messageToDict`` / ``_messageSearchItemToDict``
- pairing 域：``_pairingRecordToDict`` / ``_pairingStatsToDict`` / ``_reconstructPairingApproval``
- whitelist 域：``_dictToWhitelistEntries`` / ``_entriesToCsv`` / ``_sanitize_csv_field``
  / ``_buildExportFilename``
- directory 域：``_directorySearchResultToDict`` / ``_directoryEntryToDict``
  / ``_channelUserToDict`` / ``_channelGroupToDict`` / ``_groupMemberToDict``
  / ``_groupMemberResultToDict``
- audit 域：``_auditEntryToDict`` / ``_auditLogStatsToDict`` / ``_auditQueryToDict``
  / ``_retentionPolicyToDict``
- outbox 域：``_buildOutboxQueryFilter`` / ``_outboxEntryToDict`` / ``_rebuildOutboxAggregate``
  / ``_outboxEntriesToCsv``
- content_review 域：``_contentReviewStatsToDict``
- 熔断器：``_serializeCircuitState``
"""

from __future__ import annotations

import dataclasses
from datetime import UTC, datetime, timedelta
from typing import Any

from yuxi.channels.application.control_plane.context import (
    ControlPlaneContext,
)
from yuxi.channels.application.observability.circuit_breaker.channel_circuit_breaker import (
    CircuitState,
)
from yuxi.channels.contract.dtos.audit.audit import (
    AuditEntry,
    AuditLogStats,
    AuditQuery,
    RetentionPolicy,
)
from yuxi.channels.contract.dtos.audit.content_review import ContentReviewStatsResult
from yuxi.channels.contract.dtos.config.config import (
    ConfigField,
    ConfigValue,
)
from yuxi.channels.contract.dtos.identity.directory import (
    ChannelGroup,
    ChannelUser,
    DirectorySearchResult,
    GroupMember,
    GroupMemberResult,
)
from yuxi.channels.contract.dtos.messaging.channel import (
    AccountStatus,
    ChannelType,
    MessageSearchItem,
    SessionStatus,
)
from yuxi.channels.contract.dtos.outbox.outbox import (
    OutboxEntry,
    OutboxQueryFilter,
    OutboxStatus,
)
from yuxi.channels.contract.dtos.pairing.pairing import (
    PairingRecord,
    PairingStatsResult,
)
from yuxi.channels.contract.dtos.whitelist.whitelist import (
    WhitelistEntry,
    WhitelistPolicyType,
    whitelistEntryFromDict,
)
from yuxi.channels.contract.errors import ValidationError
from yuxi.channels.contract.ports.driven.shared.masking_port import MaskingPort
from yuxi.channels.core.outbox import outbox_entry as outbox_entry_model
from yuxi.channels.core.pairing.pairing_approval import PairingApproval
from yuxi.utils.datetime_utils import coerce_any_to_utc_datetime, format_utc_datetime

# FR-14 目录查询缓存 TTL（秒），PRD §FR-14 建议 5 分钟
_DIRECTORY_CACHE_TTL_SECONDS = 300


def _serializeCircuitState(state: CircuitState | None) -> dict[str, Any] | None:
    """序列化熔断器状态快照为 JSON 可序列化的 dict，``None`` 原样返回。"""
    if state is None:
        return None
    return {
        "status": state.status,
        "failure_count": state.failure_count,
        "opened_at": state.opened_at.isoformat() if state.opened_at else None,
        "recovery_timeout": state.recovery_timeout,
        "half_open_permits": state.half_open_permits,
    }


def dataclass_to_dict(obj: Any) -> dict[str, Any]:
    """将 dataclass 实例序列化为 dict，供控制面 handler 返回 dispatch_result。"""
    return dataclasses.asdict(obj)


def _requireAccountId(ctx: ControlPlaneContext) -> str:
    """从控制面上下文提取并校验 ``account_id`` 参数。缺失或为空抛 ``ValidationError``（400）。"""
    account_id = ctx.params.get("account_id")
    if not account_id or not isinstance(account_id, str):
        raise ValidationError(
            "account_id",
            "account_id is required and must be a non-empty string",
            trace_id=ctx.trace_id,
        )
    return account_id


def _requireParam(ctx: ControlPlaneContext, name: str) -> Any:
    """从控制面上下文提取并校验必填参数。缺失抛 ``ValidationError``（400）。"""
    value = ctx.params.get(name)
    if value is None:
        raise ValidationError(
            name,
            f"{name} is required",
            trace_id=ctx.trace_id,
        )
    return value


def _coerceQueryDateTime(
    value: Any,
    field_name: str,
    trace_id: str | None,
) -> datetime | None:
    """将查询参数中的时间值统一转换为 UTC datetime（FR-34）。

    支持 ``datetime`` / ISO 8601 字符串 / Unix 时间戳；``None`` 原样返回。
    非法格式抛 ``ValidationError``（400），避免原生异常被 ``_executeControl``
    兜底翻译为 ``InternalError``（500）。
    """
    try:
        return coerce_any_to_utc_datetime(value)
    except (ValueError, TypeError) as exc:
        raise ValidationError(
            field_name,
            f"invalid {field_name} format: {value!r}",
            trace_id=trace_id,
        ) from exc


def _coerceChannelType(value: Any, trace_id: str | None) -> ChannelType | None:
    """将查询参数中的渠道类型值统一转换为 ``ChannelType``。

    支持非空字符串与 ``ChannelType`` 实例；``None`` 原样返回。
    非法值（空字符串、非字符串）抛 ``ValidationError``（400）。
    """
    if value is None:
        return None
    if isinstance(value, ChannelType):
        return value
    if isinstance(value, str) and value:
        return ChannelType(value)
    raise ValidationError(
        "channel_type",
        f"invalid channel_type: {value!r}",
        trace_id=trace_id,
    )


def _coerceAccountStatus(value: Any, trace_id: str | None) -> AccountStatus | None:
    """将查询参数中的账户状态值统一转换为 ``AccountStatus`` 枚举。

    支持 ``AccountStatus`` 实例与合法枚举值字符串（``active`` /
    ``disabled`` / ``degraded``）；``None`` 原样返回。非法值抛
    ``ValidationError``（400），避免原生异常被 ``_executeControl`` 兜底
    翻译为 ``InternalError``（500）。
    """
    if value is None:
        return None
    if isinstance(value, AccountStatus):
        return value
    try:
        return AccountStatus(value)
    except ValueError as exc:
        raise ValidationError(
            "status",
            f"invalid account status: {value!r}",
            trace_id=trace_id,
        ) from exc


def _coerceSessionStatus(value: Any, trace_id: str | None) -> SessionStatus | None:
    """将查询参数中的会话状态值统一转换为 ``SessionStatus`` 枚举。

    支持 ``SessionStatus`` 实例与合法枚举值字符串（``active`` /
    ``closed``）；``None`` 原样返回。非法值抛 ``ValidationError``（400），
    避免原生异常被 ``_executeControl`` 兜底翻译为 ``InternalError``（500）。
    """
    if value is None:
        return None
    if isinstance(value, SessionStatus):
        return value
    try:
        return SessionStatus(value)
    except ValueError as exc:
        raise ValidationError(
            "status",
            f"invalid session status: {value!r}",
            trace_id=trace_id,
        ) from exc


# ---- config 域 ----


def _configValueToDict(value: ConfigValue) -> dict[str, Any]:
    """将 ConfigValue 转换为字典。"""
    return {
        "key": value.key,
        "value": value.value,
        "version": value.version,
        "scope": value.scope.value,
    }


def _configFieldToDict(field: ConfigField) -> dict[str, Any]:
    """将 ``ConfigField`` schema 元数据转换为响应字典。

    ``constraints`` 为 ``None`` 时返回空字典，避免前端表单渲染 null；
    ``default`` 原样返回（可能为多种类型）。
    ``scope`` 供配置管理页按作用域分组与筛选（CFG-02）。
    ``title`` / ``description`` / ``category`` 为可选展示元数据，缺失时
    返回 ``None``，由前端 fallback 到 key 本身。
    """
    return {
        "key": field.key,
        "type": field.type,
        "required": field.required,
        "default": field.default,
        "hot_reloadable": field.hot_reloadable,
        "scope": field.scope.value if field.scope else None,
        "constraints": field.constraints or {},
        "title": field.title,
        "description": field.description,
        "category": field.category,
    }


def _normalizeConfigEntries(value: Any) -> list[dict[str, Any]]:
    """将 ``allow_from`` 配置值归一化为字典列表（FR-18）。

    支持三种历史格式：字符串（视为单条 ``peer_id``）、字符串列表、字典列表
    （补齐缺失的 ``peer_type`` 为 ``dm``，仅保留含 ``peer_id`` 的合法条目）。
    归一化后所有条目均含 ``peer_type``，确保 add/remove 按 ``peer_id + peer_type``
    联合匹配，避免误删其他策略类型的条目。
    """
    if value is None:
        return []
    if isinstance(value, str):
        return [{"peer_id": value, "peer_type": WhitelistPolicyType.DM.value}]
    if isinstance(value, list):
        result: list[dict[str, Any]] = []
        for item in value:
            if isinstance(item, str):
                result.append({"peer_id": item, "peer_type": WhitelistPolicyType.DM.value})
            elif isinstance(item, dict) and item.get("peer_id"):
                normalized = dict(item)
                if "peer_type" not in normalized:
                    normalized["peer_type"] = WhitelistPolicyType.DM.value
                result.append(normalized)
        return result
    return []


def _configExportResultToDict(result: Any) -> dict[str, Any]:
    """将 ``ConfigExportResult`` 转换为响应字典。"""
    return {
        "scope": result.scope.value,
        "target": result.target,
        "config_data": result.config_data,
        "version": result.version,
        "exported_at": result.exported_at.isoformat() if result.exported_at else None,
    }


def _importConfigResultToDict(result: Any) -> dict[str, Any]:
    """将 ``ImportConfigResult`` 转换为响应字典。

    ``failed_keys`` 为 ``ConfigImportFailure`` 元组，逐项序列化为 ``dict``
    （``key`` / ``reason``），供前端展示具体失败原因。
    """
    return {
        "imported_count": result.imported_count,
        "skipped_count": result.skipped_count,
        "failed_count": result.failed_count,
        "failed_keys": [{"key": f.key, "reason": f.reason} for f in result.failed_keys],
        "imported_at": result.imported_at.isoformat() if result.imported_at else None,
    }


def _batchUpdateConfigResultToDict(result: Any) -> dict[str, Any]:
    """将 ``BatchUpdateConfigResult`` 转换为响应字典。

    ``failed`` 为 ``BatchOperationFailure`` 元组，逐项序列化为 ``dict``
    （``id`` / ``error_code`` / ``message``），与 DTO 类型声明一致。
    """
    return {
        "total": result.total,
        "succeeded": [{"key": item.key, "new_version": item.new_version} for item in result.succeeded],
        "failed": [{"id": f.id, "error_code": f.error_code, "message": f.message} for f in result.failed],
    }


# ---- session 域 ----


def _channelSessionToDict(session: Any) -> dict[str, Any]:
    """将 ChannelSession 转换为字典（运维排查用例）。

    包含会话所有者、统一身份关联、临时会话标记等运维排查必要字段。
    ``status`` / ``last_active_at`` 由原始字段推导，便于前端直接展示。
    """
    last_message_at = getattr(session, "last_message_at", None)
    updated_at = getattr(session, "updated_at", None)
    closed_at = getattr(session, "closed_at", None)
    last_active_at = last_message_at if last_message_at is not None else updated_at
    return {
        "session_id": session.session_id,
        "channel_type": session.channel_type if session.channel_type else None,
        "account_id": session.account_id,
        "peer_id": session.peer_id,
        "chat_type": session.chat_type,
        "conversation_id": session.conversation_id,
        "has_conversation": bool(session.conversation_id),
        "unified_identity_id": session.unified_identity_id,
        "owner_peer_id": session.owner_peer_id,
        "is_temporary": session.is_temporary,
        "status": "closed" if closed_at is not None else "active",
        "created_at": session.created_at.isoformat() if session.created_at else None,
        "updated_at": updated_at.isoformat() if updated_at else None,
        "last_message_at": last_message_at.isoformat() if last_message_at else None,
        "last_active_at": last_active_at.isoformat() if last_active_at else None,
        "closed_at": closed_at.isoformat() if closed_at else None,
        "deleted_at": session.deleted_at.isoformat() if session.deleted_at else None,
    }


# ---- message 域 ----


def _messageToDict(message: Any, masking_port: MaskingPort) -> dict[str, Any]:
    """将 Message 转换为字典（运维排查用例）。

    含渠道侧状态字段（``channel_status`` / ``channel_status_history``），
    满足投递失败排查需求。``operations_history`` 字段可能包含工具调用
    参数、执行结果等敏感内容，通过 ``MaskingPort.maskFull`` 递归脱敏后
    返回（全量遮蔽，避免泄露 token、密钥等敏感字段）。

    会话上下文字段（``channel_session_id`` / ``channel_account_id`` /
    ``peer_id`` / ``conversation_title``）优先从 ``message`` 自身属性读取
    （适配器在查询后注入），缺失时回退到 ``message.conversation`` 关联，
    供前端在列表/详情中展示会话上下文。
    """
    operations_history = message.operations_history
    if operations_history:
        operations_history = [
            masking_port.maskFull(item) if isinstance(item, dict) else item for item in operations_history
        ]
    conversation = getattr(message, "conversation", None)
    channel_session_id = getattr(message, "channel_session_id", None)
    channel_account_id = getattr(message, "channel_account_id", None)
    peer_id = getattr(message, "peer_id", None)
    conversation_title = getattr(message, "conversation_title", None)
    if conversation is not None:
        if conversation_title is None:
            conversation_title = getattr(conversation, "title", None)
        if channel_session_id is None:
            channel_session_id = getattr(conversation, "channel_session_id", None)
        if channel_account_id is None:
            channel_account_id = getattr(conversation, "channel_account_id", None)
        if peer_id is None:
            peer_id = getattr(conversation, "peer_id", None)
        if peer_id is None:
            extra_metadata = getattr(conversation, "extra_metadata", None) or {}
            peer_id = extra_metadata.get("peer_id") if isinstance(extra_metadata, dict) else None
    return {
        "message_id": message.message_id,
        "conversation_id": message.conversation_id,
        "role": message.role,
        "content": message.content,
        "channel_status": message.channel_status,
        "channel_msg_id": message.channel_msg_id,
        "ref_channel_msg_id": message.ref_channel_msg_id,
        "channel_status_history": message.channel_status_history,
        "operations_history": operations_history,
        "channel_read_at": message.channel_read_at.isoformat() if message.channel_read_at else None,
        "channel_recalled_at": message.channel_recalled_at.isoformat() if message.channel_recalled_at else None,
        "channel_edited_at": message.channel_edited_at.isoformat() if message.channel_edited_at else None,
        "created_at": message.created_at.isoformat() if message.created_at else None,
        "channel_session_id": channel_session_id,
        "channel_account_id": channel_account_id,
        "peer_id": peer_id,
        "conversation_title": conversation_title,
    }


def _messageSearchItemToDict(item: MessageSearchItem) -> dict[str, Any]:
    """将 ``MessageSearchItem`` 序列化为 dict（MSG-SEARCH-01）。

    ``channel_type`` 为 ``StrEnum``，序列化为 ``.value`` 字符串；
    ``created_at`` 序列化为 ISO 8601 字符串。同时返回会话上下文字段
    ``channel_account_id`` / ``peer_id`` / ``conversation_title``，与
    ``_messageToDict`` 保持一致。
    """
    return {
        "message_id": item.message_id,
        "conversation_id": item.conversation_id,
        "channel_session_id": item.channel_session_id,
        "channel_account_id": item.channel_account_id,
        "channel_type": item.channel_type if item.channel_type else None,
        "role": item.role,
        "peer_id": item.peer_id,
        "conversation_title": item.conversation_title,
        "content": item.content,
        "snippet": item.snippet,
        "created_at": item.created_at.isoformat() if item.created_at else None,
    }


# ---- pairing 域 ----


def _pairingRecordToDict(record: PairingRecord) -> dict[str, Any]:
    """将 PairingRecord 转换为字典（FR-33 审批列表完整字段）。

    包含配对 ID、渠道账户业务 ID、渠道类型、对端信息、状态、审批人、
    全量时间戳与原因，供管理后台展示与审计追溯。所有时间戳统一使用
    ``format_utc_datetime`` 序列化为带 ``Z`` 后缀的 UTC ISO 8601 字符串
    （与 ``_pairingStatsToDict`` 一致，避免前端按本地时区解析偏移）。
    """
    return {
        "pairing_id": record.pairing_id,
        "channel_account_id": record.channel_account_id,
        "channel_type": record.channel_type if record.channel_type else None,
        "peer_id": record.peer_id,
        "peer_name": record.peer_name,
        "status": record.status.value,
        "approver_id": record.approver_id,
        "approved_at": format_utc_datetime(record.approved_at),
        "rejected_at": format_utc_datetime(record.rejected_at),
        "expired_at": format_utc_datetime(record.expired_at),
        "revoked_at": format_utc_datetime(record.revoked_at),
        "reason": record.reason,
        "created_at": format_utc_datetime(record.created_at),
        "updated_at": format_utc_datetime(record.updated_at),
        "expires_at": format_utc_datetime(record.expires_at),
        "requested_at": format_utc_datetime(record.requested_at),
        "version": record.version,
    }


def _pairingStatsToDict(result: PairingStatsResult) -> dict[str, Any]:
    """将 ``PairingStatsResult`` 转换为响应字典（PRG-STATS）。

    参数：
        result: 配对统计结果值对象。

    返回：
        含 total_requested / approved_count / rejected_count / revoked_count /
        expired_count / approve_rate / avg_approval_seconds / trend 字段的
        字典。``trend`` 中 ``timestamp`` 转为 ISO 8601 字符串。
    """
    return {
        "total_requested": result.total_requested,
        "approved_count": result.approved_count,
        "rejected_count": result.rejected_count,
        "revoked_count": result.revoked_count,
        "expired_count": result.expired_count,
        "approve_rate": result.approve_rate,
        "avg_approval_seconds": result.avg_approval_seconds,
        "trend": [
            {
                "timestamp": format_utc_datetime(point.timestamp) or "",
                "requested": point.requested,
                "approved": point.approved,
            }
            for point in result.trend
        ],
    }


def _reconstructPairingApproval(record: PairingRecord) -> PairingApproval:
    """从 PairingRecord 重构 PairingApproval 聚合根。

    委托 ``PairingApproval.fromRecord`` 统一重建逻辑，携带完整字段
    （approved_at/rejected_at/revoked_at/reason 等）确保状态机校验与
    领域逻辑一致。使用记录本身的 ``version`` 字段保证乐观锁正确性。
    """
    return PairingApproval.fromRecord(record)


# ---- whitelist 域 ----


def _dictToWhitelistEntries(
    raw_entries: Any,
    policy_type: WhitelistPolicyType,
    operator_user_id: str,
) -> tuple[tuple[WhitelistEntry, ...], list[dict[str, str]]]:
    """将原始条目字典列表转换为 ``WhitelistEntry`` 元组。

    遍历 ``raw_entries``，调 ``whitelistEntryFromDict`` 构造条目，
    并强制覆盖 ``added_by`` 为当前操作人（防止客户端伪造创建者，
    与单条添加 ``_whitelistAdd`` 保持一致）。

    构造失败（``peer_id`` 缺失/为空、``expires_at`` 格式非法）由
    ``whitelistEntryFromDict`` 抛 ``ValidationError``，此处捕获后跳过
    并记入 ``failures``，避免单条非法条目让整批导入崩溃（与
    ``stop_on_error=False`` 的部分成功语义一致；``stop_on_error=True``
    时由 handler 解析阶段终止整批）。

    参数：
        raw_entries: 原始条目字典列表。
        policy_type: 白名单策略类型（用于 failures 上下文）。
        operator_user_id: 当前操作人 ID，强制写入 ``added_by``。

    返回：
        (entries, failures) 元组：entries 为成功构造的条目元组，
        failures 为失败项列表（含 ``peer_id`` / ``reason`` 字段）。
    """
    if not isinstance(raw_entries, list):
        return (), []
    entries: list[WhitelistEntry] = []
    failures: list[dict[str, str]] = []
    for item in raw_entries:
        if not isinstance(item, dict):
            failures.append({"peer_id": "", "reason": "invalid entry format"})
            continue
        try:
            entry = whitelistEntryFromDict(item)
        except ValidationError as exc:
            failures.append({"peer_id": str(item.get("peer_id", "")), "reason": str(exc)})
            continue
        # 强制覆盖 added_by 为当前操作人，防止客户端伪造创建者
        entry = WhitelistEntry(
            peer_id=entry.peer_id,
            peer_name=entry.peer_name,
            peer_type=entry.peer_type,
            reason=entry.reason,
            added_by=operator_user_id,
            expires_at=entry.expires_at,
        )
        entries.append(entry)
    return tuple(entries), failures


def _sanitize_csv_field(value: str) -> str:
    """防护 CSV injection：危险前缀字段前缀单引号。

    若字段值以 ``=`` / ``+`` / ``-`` / ``@`` / ``\\t`` / ``\\r`` / ``\\n``
    开头，需在字段前缀单引号 ``'`` 防止 Excel 等表格软件误解析为公式。
    """
    if value and value[0] in ("=", "+", "-", "@", "\t", "\r", "\n"):
        return f"'{value}"
    return value


def _entriesToCsv(entries: tuple[WhitelistEntry, ...]) -> str:
    """将白名单条目转换为 CSV 字符串（含 CSV injection 防护）。

    列顺序：``peer_id,peer_name,peer_type,reason,added_by,expires_at``。
    危险前缀字段（``=`` / ``+`` / ``-`` / ``@`` / ``\\t`` / ``\\r`` / ``\\n``）
    前缀单引号防护，防止 Excel 等表格软件误解析为公式。
    """
    import csv
    import io

    output = io.StringIO()
    writer = csv.writer(output)
    writer.writerow(["peer_id", "peer_name", "peer_type", "reason", "added_by", "expires_at"])
    for entry in entries:
        writer.writerow(
            [
                _sanitize_csv_field(entry.peer_id),
                _sanitize_csv_field(entry.peer_name) if entry.peer_name else "",
                entry.peer_type.value,
                _sanitize_csv_field(entry.reason) if entry.reason else "",
                entry.added_by or "",
                entry.expires_at.isoformat() if entry.expires_at else "",
            ]
        )
    return output.getvalue()


def _buildExportFilename(
    channel_type: Any,
    account_id: str,
    policy_type: WhitelistPolicyType,
) -> str:
    """构造导出文件名。

    格式：``allowlist_{channel_type}_{account_id}_{policy_type}_{YYYYMMDD}.csv``。
    """
    from datetime import datetime as _dt

    channel = channel_type if hasattr(channel_type, "value") else str(channel_type)
    date_str = _dt.now().strftime("%Y%m%d")
    return f"allowlist_{channel}_{account_id}_{policy_type.value}_{date_str}.csv"


# ---- directory 域 ----


def _directorySearchResultToDict(result: DirectorySearchResult) -> dict[str, Any]:
    """将 DirectorySearchResult 转换为字典（FR-14）。"""
    return {
        "entries": [_directoryEntryToDict(e) for e in result.entries],
        "next_cursor": result.next_cursor,
    }


def _directoryEntryToDict(entry: Any) -> dict[str, Any]:
    """将 DirectoryEntry 转换为字典（FR-14）。

    ``entry`` 可能为 ``DirectoryEntry`` 或携带用户 / 群组元数据的条目。
    新增字段（``avatar_url`` / ``alias`` / ``remark`` / ``tags`` /
    ``member_count`` / ``owner_id``）优先从顶层字段读取；顶层缺失时
    fallback 到 ``entry.metadata`` 中的同名字段。``extra_metadata``
    保持嵌套输出。
    """
    metadata = entry.metadata or {}
    result: dict[str, Any] = {
        "type": entry.type.value if hasattr(entry.type, "value") else str(entry.type),
        "id": entry.id,
        "name": entry.name,
        "avatar_url": entry.avatar_url if entry.avatar_url is not None else metadata.get("avatar_url"),
        "alias": entry.alias if entry.alias is not None else metadata.get("alias"),
        "remark": entry.remark if entry.remark is not None else metadata.get("remark"),
        "tags": entry.tags if entry.tags is not None else metadata.get("tags"),
        "member_count": entry.member_count if entry.member_count is not None else metadata.get("member_count"),
        "owner_id": entry.owner_id if entry.owner_id is not None else metadata.get("owner_id"),
        "metadata": entry.metadata,
    }
    if entry.extra_metadata:
        result["extra_metadata"] = entry.extra_metadata
    return result


def _channelUserToDict(user: ChannelUser) -> dict[str, Any]:
    """将 ChannelUser 转换为字典（FR-14）。"""
    return {
        "peer_id": user.peer_id,
        "name": user.name,
        "avatar_url": user.avatar_url,
        "email": user.email,
        "phone": user.phone,
    }


def _channelGroupToDict(group: ChannelGroup) -> dict[str, Any]:
    """将 ChannelGroup 转换为字典（FR-14）。"""
    return {
        "group_id": group.group_id,
        "name": group.name,
        "member_count": group.member_count,
    }


def _groupMemberToDict(member: GroupMember) -> dict[str, Any]:
    """将 GroupMember 转换为字典（FR-14）。"""
    return {
        "user_id": member.user_id,
        "group_id": member.group_id,
        "role": member.role,
        "joined_at": member.joined_at.isoformat() if member.joined_at else None,
    }


def _groupMemberResultToDict(result: GroupMemberResult) -> dict[str, Any]:
    """将 GroupMemberResult 转换为字典（FR-14）。"""
    return {
        "members": [_groupMemberToDict(m) for m in result.members],
        "next_cursor": result.next_cursor,
    }


# ---- audit 域 ----


def _auditEntryToDict(entry: AuditEntry) -> dict[str, Any]:
    """将 AuditEntry 转换为字典。

    包含目标渠道、目标账户与操作详情（``params_summary``，已脱敏），满足
    PRD FR-34 审计日志查询返回 ``操作详情（JSON）`` / ``目标渠道`` /
    ``目标账户`` 字段要求。``timestamp`` 统一输出 UTC ISO 8601 字符串
    （带 ``Z`` 后缀），与 ORM ``to_dict()`` 格式一致。``id`` 为 ORM 主键，
    供 Router 层构造 keyset pagination 游标使用。
    """
    return {
        "id": entry.id,
        "operator": entry.operator,
        "operation": entry.operation.value,
        "target": entry.target,
        "target_channel": entry.target_channel,
        "target_account": entry.target_account,
        "result": entry.result,
        "timestamp": format_utc_datetime(entry.timestamp),
        "params_summary": entry.params_summary,
        "trace_id": entry.trace_id,
        "source_ip": entry.source_ip,
        "request_id": entry.request_id,
        "message_id": entry.message_id,
        "content_summary": entry.content_summary,
    }


def _auditLogStatsToDict(stats: AuditLogStats) -> dict[str, Any]:
    """将 ``AuditLogStats`` 序列化为 dict（AUD-05）。

    ``time_range_start`` / ``time_range_end`` 序列化为 ISO 8601 字符串，
    ``None`` 保留。
    """
    return {
        "total": stats.total,
        "by_operation_type": dict(stats.by_operation_type),
        "by_result": dict(stats.by_result),
        "time_range_start": format_utc_datetime(stats.time_range_start) if stats.time_range_start else None,
        "time_range_end": format_utc_datetime(stats.time_range_end) if stats.time_range_end else None,
    }


def _auditQueryToDict(query: AuditQuery) -> dict[str, Any]:
    """将 ``AuditQuery`` 序列化为 dict。

    枚举字段序列化为 ``.value`` 字符串，datetime 序列化为 ISO 8601 字符串，
    ``None`` 保留。供 ``query_snapshot`` 嵌套字段序列化使用。
    """
    return {
        "operation_type": query.operation_type.value if query.operation_type else None,
        "operator": query.operator,
        "target_channel": query.target_channel if query.target_channel else None,
        "target_account": query.target_account,
        "start_time": query.start_time.isoformat() if query.start_time else None,
        "end_time": query.end_time.isoformat() if query.end_time else None,
        "limit": query.limit,
        "offset": query.offset,
    }


def _retentionPolicyToDict(policy: RetentionPolicy) -> dict[str, Any]:
    """将 ``RetentionPolicy`` 转换为响应字典。

    参数：
        policy: 审计保留策略值对象。

    返回：
        含 default_retention_days / by_operation_type / auto_archive_enabled /
        auto_archive_before_days / updated_at 字段的字典。
    """
    return {
        "default_retention_days": policy.default_retention_days,
        "by_operation_type": policy.by_operation_type,
        "auto_archive_enabled": policy.auto_archive_enabled,
        "auto_archive_before_days": policy.auto_archive_before_days,
        "updated_at": policy.updated_at.isoformat() if policy.updated_at else None,
    }


# ---- outbox 域 ----


def _buildOutboxQueryFilter(payload: dict[str, Any]) -> OutboxQueryFilter:
    """从 payload dict 构造 ``OutboxQueryFilter``。``datetime`` 字段接受 ISO 8601 字符串或 ``datetime`` 实例。

    ``message_id`` / ``channel_msg_id`` / ``channel_account_id`` / ``last_error``
    优先映射为对应的 ``*_like`` 模糊搜索字段，保持向后兼容：传入精确值时
    ``LIKE`` 子串匹配仍可命中；同时支持前端直接传入 ``*_like`` 字段。
    """
    channel_type_value = payload.get("channel_type")
    channel_type: ChannelType | None = None
    if channel_type_value is not None:
        channel_type = _coerceChannelType(channel_type_value, None)

    status_value = payload.get("status")
    status: OutboxStatus | None = None
    if status_value is not None:
        status = OutboxStatus(status_value)

    created_after = _coerceQueryDateTime(payload.get("created_after"), "created_after", None)
    created_before = _coerceQueryDateTime(payload.get("created_before"), "created_before", None)
    retry_count_min = payload.get("retry_count_min")

    def _like_value(key: str) -> str | None:
        return payload.get(key) if payload.get(key) is not None else None

    message_id_like = _like_value("message_id_like") or _like_value("message_id")
    channel_msg_id_like = _like_value("channel_msg_id_like") or _like_value("channel_msg_id")
    channel_account_id_like = _like_value("channel_account_id_like") or _like_value("channel_account_id")
    last_error_like = _like_value("last_error_like") or _like_value("last_error")

    return OutboxQueryFilter(
        channel_type=channel_type,
        channel_account_id=payload.get("channel_account_id"),
        status=status,
        message_id=payload.get("message_id"),
        channel_msg_id=payload.get("channel_msg_id"),
        created_after=created_after,
        created_before=created_before,
        channel_session_id=payload.get("channel_session_id"),
        retry_count_min=retry_count_min,
        message_id_like=message_id_like,
        channel_msg_id_like=channel_msg_id_like,
        channel_account_id_like=channel_account_id_like,
        last_error_like=last_error_like,
    )


def _outboxEntryToDict(entry: OutboxEntry) -> dict[str, Any]:
    """将 ``OutboxEntry`` DTO 序列化为 dict。

    ``status`` / ``durability_policy`` 为 ``StrEnum``，序列化为 ``.value``
    字符串；``channel_type`` 为 ``ChannelType``（``str`` 子类，非 Enum，
    无 ``.value``），用 ``str()`` 取字符串值；``datetime`` 字段序列化为
    ISO 8601 字符串（``None`` 保留）。
    """
    return {
        "outbox_id": entry.outbox_id,
        "message_id": entry.message_id,
        "channel_account_id": entry.channel_account_id,
        "channel_session_id": entry.channel_session_id,
        "channel_type": str(entry.channel_type) if entry.channel_type else None,
        "status": entry.status.value,
        "durability_policy": entry.durability_policy.value,
        "retry_count": entry.retry_count,
        "max_retry": entry.max_retry,
        "next_retry_at": entry.next_retry_at.isoformat() if entry.next_retry_at else None,
        "last_error": entry.last_error,
        "channel_msg_id": entry.channel_msg_id,
        "created_at": entry.created_at.isoformat() if entry.created_at else None,
        "updated_at": entry.updated_at.isoformat() if entry.updated_at else None,
        "expires_at": entry.expires_at.isoformat() if entry.expires_at else None,
        "version": entry.version,
    }


def _rebuildOutboxAggregate(entry: OutboxEntry) -> outbox_entry_model.OutboxAggregateRoot:
    """从 ``OutboxEntry`` DTO 重建发件箱聚合根实例。

    聚合根类与 DTO 同名但不同模块，本函数以模块别名引用聚合根类避免命名冲突。
    重建后调用 ``canRetry()`` 校验状态机不变量（INV-3）。
    """
    expires_at = entry.expires_at or (
        entry.created_at + timedelta(seconds=86400) if entry.created_at else datetime.now(UTC)
    )
    return outbox_entry_model.OutboxAggregateRoot(
        outbox_id=entry.outbox_id,
        message_id=entry.message_id,
        channel_account_id=entry.channel_account_id,
        status=entry.status,
        durability_policy=entry.durability_policy,
        retry_count=entry.retry_count,
        max_retry=entry.max_retry,
        next_retry_at=entry.next_retry_at,
        last_error=entry.last_error,
        channel_msg_id=entry.channel_msg_id,
        created_at=entry.created_at,
        updated_at=entry.updated_at,
        expires_at=expires_at,
        version=entry.version,
        latency_ms=entry.latency_ms,
        funnel_node=entry.funnel_node,
        sent_at=entry.sent_at,
        last_retry_at=entry.last_retry_at,
        idempotency_key=entry.idempotency_key,
        channel_request_id=entry.channel_request_id,
        partial_failure=entry.partial_failure,
        stream_aborted_at_chunk=entry.stream_aborted_at_chunk,
        degraded_reason=entry.degraded_reason,
    )


def _outboxEntriesToCsv(entries: tuple[OutboxEntry, ...]) -> str:
    """将死信 outbox 条目元组序列化为 CSV 字符串（含 CSV injection 防护）。

    列顺序：``outbox_id,message_id,channel_account_id,channel_session_id,status,
    durability_policy,retry_count,max_retry,next_retry_at,last_error,channel_msg_id,
    created_at,updated_at,expires_at,version``。``datetime`` 字段输出 ISO 8601
    字符串，``None`` 输出空字符串。危险前缀字段经 ``_sanitize_csv_field`` 防护。
    """
    import csv
    import io

    output = io.StringIO()
    writer = csv.writer(output)
    writer.writerow(
        [
            "outbox_id",
            "message_id",
            "channel_account_id",
            "channel_session_id",
            "status",
            "durability_policy",
            "retry_count",
            "max_retry",
            "next_retry_at",
            "last_error",
            "channel_msg_id",
            "created_at",
            "updated_at",
            "expires_at",
            "version",
        ]
    )
    for entry in entries:
        writer.writerow(
            [
                _sanitize_csv_field(entry.outbox_id),
                _sanitize_csv_field(entry.message_id),
                _sanitize_csv_field(entry.channel_account_id),
                _sanitize_csv_field(entry.channel_session_id) if entry.channel_session_id else "",
                entry.status.value,
                entry.durability_policy.value,
                entry.retry_count,
                entry.max_retry,
                entry.next_retry_at.isoformat() if entry.next_retry_at else "",
                _sanitize_csv_field(entry.last_error) if entry.last_error else "",
                _sanitize_csv_field(entry.channel_msg_id) if entry.channel_msg_id else "",
                entry.created_at.isoformat() if entry.created_at else "",
                entry.updated_at.isoformat() if entry.updated_at else "",
                entry.expires_at.isoformat() if entry.expires_at else "",
                entry.version,
            ]
        )
    return output.getvalue()


# ---- content_review 域 ----


def _contentReviewStatsToDict(result: ContentReviewStatsResult) -> dict[str, Any]:
    """将 ``ContentReviewStatsResult`` 转换为响应字典。

    参数：
        result: 审核统计结果值对象。

    返回：
        含 total_reviews / pass_count / review_count / block_count /
        pass_rate / block_rate / manual_intervention_rate /
        avg_decision_seconds / by_category / trend 字段的字典。
        ``by_category`` 与 ``trend`` 中的 ``datetime`` 转为 ISO 8601 字符串。
    """
    return {
        "total_reviews": result.total_reviews,
        "pass_count": result.pass_count,
        "review_count": result.review_count,
        "block_count": result.block_count,
        "pass_rate": result.pass_rate,
        "block_rate": result.block_rate,
        "manual_intervention_rate": result.manual_intervention_rate,
        "avg_decision_seconds": result.avg_decision_seconds,
        "by_category": [{"category": stat.category, "count": stat.count} for stat in result.by_category],
        "trend": [
            {
                "timestamp": format_utc_datetime(point.timestamp) or "",
                "pass_count": point.pass_count,
                "block_count": point.block_count,
            }
            for point in result.trend
        ],
    }


# ---- plugin 域 ----


def _lifecycleResultToDict(result: Any, plugin_id: str) -> dict[str, Any]:
    """将 ``LifecycleResult`` 转换为响应字典。"""
    return {
        "plugin_id": plugin_id,
        "state": result.state,
        "error": result.error,
        "error_code": result.error_code,
        "trace_id": result.trace_id,
    }


def _pluginSummaryToDict(summary: Any) -> dict[str, Any]:
    """将 ``PluginSummary`` 转换为响应字典。"""
    return {
        "plugin_id": summary.plugin_id,
        "name": summary.name,
        "version": summary.version,
        "channel_type": summary.channel_type,
        "state": summary.state,
    }


def _pluginCatalogItemToDict(item: Any) -> dict[str, Any]:
    """将 ``PluginCatalogItem`` 转换为响应字典。

    ``capabilities`` 字段为 ``ChannelCapabilities`` dataclass，交由 Router 层
    ``serialize_control_data`` 递归序列化（dataclass 嵌套）。``icon`` /
    ``last_error`` 为 ``str | None``，缺失时返回 ``None``，前端回退默认图标。
    ``requires_restart`` 为 bool，供前端「待重启」角标展示。
    """
    return {
        "plugin_id": item.plugin_id,
        "name": item.name,
        "version": item.version,
        "channel_type": item.channel_type,
        "state": item.state,
        "capabilities": item.capabilities,
        "last_error": item.last_error,
        "requires_restart": item.requires_restart,
        "icon": item.icon,
    }


def _pluginDetailToDict(detail: Any) -> dict[str, Any]:
    """将 ``PluginDetail`` 转换为响应字典。

    将 PluginManifest 内部嵌套的 ``manifest`` 展开为 ``channel``，避免前端
    出现 ``manifest.manifest`` 的歧义结构；同时保留 adapters / stages 等元
    数据，并附加 ``last_error`` 供排障展示。
    """
    return {
        "plugin_id": detail.plugin_id,
        "name": detail.name,
        "version": detail.version,
        "channel_type": detail.channel_type,
        "state": detail.state,
        "last_error": detail.last_error,
        "manifest": {
            "channel": dataclass_to_dict(detail.manifest.manifest),
            "adapters": list(detail.manifest.adapters),
            "stages": list(detail.manifest.stages),
            "event_subscriptions": list(detail.manifest.event_subscriptions),
            "config_sources": list(detail.manifest.config_sources),
        },
    }


def _installPluginResultToDict(result: Any) -> dict[str, Any]:
    """将 ``InstallPluginResult`` 转换为响应字典。"""
    return {
        "plugin_id": result.plugin_id,
        "version": result.version,
        "installed_at": result.installed_at.isoformat() if result.installed_at else None,
        "requires_load": result.requires_load,
    }


def _uninstallPluginResultToDict(result: Any) -> dict[str, Any]:
    """将 ``UninstallPluginResult`` 转换为响应字典。"""
    return {
        "plugin_id": result.plugin_id,
        "uninstalled_at": result.uninstalled_at.isoformat() if result.uninstalled_at else None,
        "files_removed": list(result.files_removed),
    }


def _pluginConfigResultToDict(result: Any) -> dict[str, Any]:
    """将 ``PluginConfigResult`` 转换为响应字典。"""
    return {
        "plugin_id": result.plugin_id,
        "config": result.config,
        "schema": result.schema,
        "requires_restart": result.requires_restart,
        "updated_at": result.updated_at.isoformat() if result.updated_at else None,
    }


def _batchPluginLifecycleResultToDict(result: Any) -> dict[str, Any]:
    """将 ``BatchPluginLifecycleResult`` 转换为响应字典。"""
    return {
        "total": result.total,
        "succeeded": [
            {
                "plugin_id": item.plugin_id,
                "new_state": item.new_state,
            }
            for item in result.succeeded
        ],
        "failed": list(result.failed),
    }