"""配对审批域 Router。

提供 DM 安全配对审批的 10 个 HTTP 端点，全部由 ``get_admin_user`` 守门，仅
管理员可访问。Router 不含任何业务逻辑，仅做协议翻译：将 HTTP 请求参数组装
为契约层命令/参数，调用 ``use_cases.pairing_management`` 的类型化方法走控制
面管道，再通过 ``raiseOnControlFailure`` 转译失败、``serialize_control_data``
序列化成功结果（模板 A）。

端点清单：
    - GET   /pairings                           PRG-QUERY-01  列出配对审批记录
    - POST  /pairings                           PRG-CREATE-01 发起配对请求
    - POST  /pairings/batch-approve             PRG-BATCH-ACT 批量批准配对
    - POST  /pairings/batch-reject              PRG-BATCH-ACT 批量拒绝配对
    - POST  /pairings/clean-expired             PRG-CLEAN-EXPIRED 清理过期配对
    - GET   /pairings/stats                     PRG-STATS     配对统计
    - GET   /pairings/{pairing_id}              PRG-01        查询配对详情
    - POST  /pairings/{pairing_id}/approve      PRG-ACT-01    批准配对（FR-33）
    - POST  /pairings/{pairing_id}/reject       PRG-ACT-02    拒绝配对
    - POST  /pairings/{pairing_id}/revoke       PRG-ACT-03    撤销配对
"""

from __future__ import annotations

from typing import Any

from fastapi import APIRouter, Body, Depends, Query, Request
from pydantic import BaseModel, ConfigDict, Field
from yuxi.channels.contract.dtos.channel import ChannelType
from yuxi.channels.contract.dtos.pairing import (
    BatchPairingCmd,
    CleanExpiredPairingsCmd,
    PairingQuery,
    PairingStatsQuery,
    PairingStatus,
)
from yuxi.storage.postgres.models_business import User

from server.routers.channels import (
    Granularity,
    build_operator,
    get_channel_use_cases,
    parse_datetime,
    raiseOnControlFailure,
    serialize_control_data,
)
from server.utils.auth_middleware import get_admin_user

pairing_router = APIRouter(tags=["channels-pairing"])


# ---------------- Request Schemas ----------------


class CreatePairingRequest(BaseModel):
    """发起配对请求的请求体。"""

    model_config = ConfigDict(frozen=True)

    channel_type: ChannelType = Field(..., description="渠道类型（必填）")
    account_id: str = Field(..., min_length=1, description="渠道账户 ID")
    peer_id: str = Field(..., min_length=1, description="对端 ID")
    peer_name: str | None = Field(default=None, max_length=128, description="对端名称")
    expires_in_seconds: int = Field(default=604800, ge=1, le=2592000, description="配对有效期（秒，默认7天）")


class PairingActionRequest(BaseModel):
    """配对审批操作（批准/拒绝）的请求体。"""

    model_config = ConfigDict(frozen=True)

    approver_id: str | None = Field(default=None, min_length=1, description="审批人 ID（缺省取 operator.user_id）")
    reason: str | None = Field(default=None, max_length=512, description="操作原因（审计用）")


class PairingRevokeRequest(BaseModel):
    """配对撤销操作的请求体。"""

    model_config = ConfigDict(frozen=True)

    reason: str | None = Field(default=None, max_length=512, description="撤销原因（审计用）")


class BatchPairingActionRequest(BaseModel):
    """批量配对审批操作（批准/拒绝）的请求体（PRG-BATCH-ACT）。

    ``pairing_ids`` 至少 1 条、最多 500 条，避免单次请求过大。
    """

    model_config = ConfigDict(frozen=True)

    pairing_ids: list[str] = Field(..., min_length=1, max_length=500, description="配对 ID 列表（1-500 条）")
    reason: str | None = Field(default=None, max_length=512, description="操作原因（审计用）")


class CleanExpiredPairingsRequest(BaseModel):
    """清理过期配对的请求体（PRG-CLEAN-EXPIRED）。

    ``max_count`` 限定单次清理规模（1-1000，默认 500），``older_than`` 可选
    过期时间上界（ISO 8601，缺省取当前时间）。
    """

    model_config = ConfigDict(frozen=True)

    max_count: int = Field(default=500, ge=1, le=1000, description="单次最大清理数（1-1000，默认 500）")
    older_than: str | None = Field(default=None, description="过期时间上界（ISO 8601，缺省取当前时间）")


# ---------------- Endpoints ----------------


@pairing_router.get("/pairings", response_model=dict)
async def list_pairings(
    request: Request,
    channel_type: ChannelType | None = Query(default=None, description="按渠道类型过滤"),
    account_id: str | None = Query(default=None, description="按账户 ID 过滤"),
    peer_id: str | None = Query(default=None, description="按对端 ID 过滤"),
    status: PairingStatus | None = Query(default=None, description="按状态过滤"),
    created_after: str | None = Query(default=None, description="申请时间下界（ISO 8601，含，按 requested_at 过滤）"),
    created_before: str | None = Query(default=None, description="申请时间上界（ISO 8601，含，按 requested_at 过滤）"),
    limit: int = Query(default=100, ge=1, le=1000, description="分页大小"),
    offset: int = Query(default=0, ge=0, description="分页偏移"),
    use_cases=Depends(get_channel_use_cases),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """列出配对审批记录（FR-33，PRG-QUERY-01）。

    支持按渠道/账户/对端/状态过滤，按 requested_at 倒序返回。
    对应控制面操作 ``pairing/list``。
    """
    operator = build_operator(current_user, request)
    created_after_dt = parse_datetime("created_after", created_after)
    created_before_dt = parse_datetime("created_before", created_before)
    query = PairingQuery(
        channel_type=channel_type,
        account_id=account_id,
        peer_id=peer_id,
        status=status,
        created_after=created_after_dt,
        created_before=created_before_dt,
        limit=limit,
        offset=offset,
    )
    result = await use_cases.pairing_management.listPairings(query, operator)
    raiseOnControlFailure(result)
    return {"success": True, "data": serialize_control_data(result.data)}


@pairing_router.get("/pairings/count", response_model=dict)
async def count_pairings(
    request: Request,
    channel_type: ChannelType | None = Query(default=None, description="按渠道类型过滤"),
    account_id: str | None = Query(default=None, description="按账户 ID 过滤"),
    peer_id: str | None = Query(default=None, description="按对端 ID 过滤"),
    status: PairingStatus | None = Query(default=None, description="按状态过滤"),
    created_after: str | None = Query(default=None, description="申请时间下界（ISO 8601，含，按 requested_at 过滤）"),
    created_before: str | None = Query(default=None, description="申请时间上界（ISO 8601，含，按 requested_at 过滤）"),
    use_cases=Depends(get_channel_use_cases),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """统计配对审批记录数（FR-33 待办角标）。

    支持按渠道/账户/对端/状态过滤，返回单个整数计数。
    对应控制面操作 ``pairing/count``。
    """
    operator = build_operator(current_user, request)
    created_after_dt = parse_datetime("created_after", created_after)
    created_before_dt = parse_datetime("created_before", created_before)
    query = PairingQuery(
        channel_type=channel_type,
        account_id=account_id,
        peer_id=peer_id,
        status=status,
        created_after=created_after_dt,
        created_before=created_before_dt,
        limit=1,
        offset=0,
    )
    result = await use_cases.pairing_management.countPairings(query, operator)
    raiseOnControlFailure(result)
    return {"success": True, "data": serialize_control_data(result.data)}


@pairing_router.post("/pairings", response_model=dict)
async def create_pairing(
    payload: CreatePairingRequest,
    request: Request,
    use_cases=Depends(get_channel_use_cases),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """发起配对请求（PRG-CREATE-01）。

    创建 DM 安全配对请求，等待审批流程。
    对应控制面操作 ``pairing/create``。
    """
    operator = build_operator(current_user, request)
    result = await use_cases.pairing_management.createPairing(
        channel_type=payload.channel_type,
        account_id=payload.account_id,
        peer_id=payload.peer_id,
        operator=operator,
        peer_name=payload.peer_name,
        expires_in_seconds=payload.expires_in_seconds,
    )
    raiseOnControlFailure(result)
    return {"success": True, "data": serialize_control_data(result.data)}


@pairing_router.post("/pairings/batch-approve", response_model=dict)
async def batch_approve_pairings(
    payload: BatchPairingActionRequest,
    request: Request,
    use_cases=Depends(get_channel_use_cases),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """批量批准 DM 安全配对（PRG-BATCH-ACT）。

    逐条独立事务复用单条 approve 逻辑（含降级检查 FR-36），非 PENDING 配对
    逐条记入 failed。对应控制面操作 ``pairing/batch_approve``。

    响应：``{total, succeeded: [{pairing_id, status}], failed: [{id, error_code, message}]}``。
    """
    operator = build_operator(current_user, request)
    cmd = BatchPairingCmd(
        pairing_ids=tuple(payload.pairing_ids),
        operator=operator,
        reason=payload.reason,
    )
    result = await use_cases.pairing_management.batchApprovePairings(cmd)
    raiseOnControlFailure(result)
    return {"success": True, "data": serialize_control_data(result.data)}


@pairing_router.post("/pairings/batch-reject", response_model=dict)
async def batch_reject_pairings(
    payload: BatchPairingActionRequest,
    request: Request,
    use_cases=Depends(get_channel_use_cases),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """批量拒绝 DM 安全配对（PRG-BATCH-ACT）。

    逐条独立事务复用单条 reject 逻辑（含降级检查 FR-36），非 PENDING 配对
    逐条记入 failed。对应控制面操作 ``pairing/batch_reject``。

    响应：``{total, succeeded: [{pairing_id, status}], failed: [{id, error_code, message}]}``。
    """
    operator = build_operator(current_user, request)
    cmd = BatchPairingCmd(
        pairing_ids=tuple(payload.pairing_ids),
        operator=operator,
        reason=payload.reason,
    )
    result = await use_cases.pairing_management.batchRejectPairings(cmd)
    raiseOnControlFailure(result)
    return {"success": True, "data": serialize_control_data(result.data)}


@pairing_router.post("/pairings/clean-expired", response_model=dict)
async def clean_expired_pairings(
    payload: CleanExpiredPairingsRequest,
    request: Request,
    use_cases=Depends(get_channel_use_cases),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """清理过期 DM 安全配对（PRG-CLEAN-EXPIRED）。

    查询过期 PENDING 配对，单一事务内批量更新为 EXPIRED 状态并发布
    ``PairingExpired`` 事件（COOPERATIVE fail-closed，单条失败回滚整批）。
    对应控制面操作 ``pairing/clean_expired``。

    响应：``{total, cleaned: [pairing_id, ...]}``。
    """
    operator = build_operator(current_user, request)
    cmd = CleanExpiredPairingsCmd(
        operator=operator,
        older_than=parse_datetime("older_than", payload.older_than),
        max_count=payload.max_count,
    )
    result = await use_cases.pairing_management.cleanExpiredPairings(cmd)
    raiseOnControlFailure(result)
    return {"success": True, "data": serialize_control_data(result.data)}


@pairing_router.get("/pairings/stats", response_model=dict)
async def get_pairing_stats(
    request: Request,
    channel_type: ChannelType | None = Query(default=None, description="按渠道类型过滤"),
    start_time: str | None = Query(
        default=None,
        description="起始时间过滤（ISO 8601，含）",
    ),
    end_time: str | None = Query(
        default=None,
        description="结束时间过滤（ISO 8601，含）",
    ),
    granularity: Granularity = Query(default="day", description="时间粒度"),
    use_cases=Depends(get_channel_use_cases),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """配对审批统计（PRG-STATS）。

    对应控制面操作 ``pairing/stats``（由 ``ChannelControlService.getPairingStats``
    内部构造 ``ControlCmd`` 并委托 ``_executeControl`` 执行控制面管道）。
    聚合配对审批记录，计算申请/批准/拒绝/撤销/过期计数、批准率、平均审批
    时长与按时间粒度切片的趋势。``start_time`` / ``end_time`` 可选，
    同时提供时需满足 ``start_time < end_time``。

    编排链路：HTTP 入参 → ``build_operator`` 构造操作人 → 协议翻译
    （``parse_datetime``）→ 构造 ``PairingStatsQuery`` →
    ``use_cases.pairing_management.getPairingStats`` → ``raiseOnControlFailure``
    转译失败 → ``serialize_control_data`` 序列化统计结果返回。
    """
    operator = build_operator(current_user, request)
    query = PairingStatsQuery(
        channel_type=channel_type,
        start_time=parse_datetime("start_time", start_time),
        end_time=parse_datetime("end_time", end_time),
        granularity=granularity,
    )
    result = await use_cases.pairing_management.getPairingStats(query=query, operator=operator)
    raiseOnControlFailure(result)
    return {"success": True, "data": serialize_control_data(result.data)}


@pairing_router.get("/pairings/{pairing_id}", response_model=dict)
async def get_pairing(
    pairing_id: str,
    request: Request,
    use_cases=Depends(get_channel_use_cases),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """按 pairing_id 查询配对详情（PRG-01）。

    供管理员审批前核对配对信息。对应控制面操作 ``pairing/get``。
    """
    operator = build_operator(current_user, request)
    result = await use_cases.pairing_management.getPairing(
        pairing_id=pairing_id,
        operator=operator,
    )
    raiseOnControlFailure(result)
    return {"success": True, "data": serialize_control_data(result.data)}


@pairing_router.post("/pairings/{pairing_id}/approve", response_model=dict)
async def approve_pairing(
    pairing_id: str,
    request: Request,
    payload: PairingActionRequest | None = Body(default=None),
    use_cases=Depends(get_channel_use_cases),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """批准 DM 安全配对（FR-33，PRG-ACT-01）。

    仅 PENDING 状态可批准；过期配对先惰性转为 EXPIRED 再抛 RuleViolationError；
    降级期间渠道的配对审批暂停（FR-36）返回 503。
    对应控制面操作 ``pairing/approve``。
    """
    operator = build_operator(current_user, request)
    approver_id = payload.approver_id if payload else None
    reason = payload.reason if payload else None
    result = await use_cases.pairing_management.approvePairing(
        pairing_id=pairing_id,
        operator=operator,
        approver_id=approver_id,
        reason=reason,
    )
    raiseOnControlFailure(result)
    return {"success": True, "data": serialize_control_data(result.data)}


@pairing_router.post("/pairings/{pairing_id}/reject", response_model=dict)
async def reject_pairing(
    pairing_id: str,
    request: Request,
    payload: PairingActionRequest | None = Body(default=None),
    use_cases=Depends(get_channel_use_cases),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """拒绝配对（PRG-ACT-02）。

    仅 PENDING 状态可拒绝；reason 缺省填充 "rejected by operator"。
    对应控制面操作 ``pairing/reject``。
    """
    operator = build_operator(current_user, request)
    approver_id = payload.approver_id if payload else None
    reason = payload.reason if payload else None
    result = await use_cases.pairing_management.rejectPairing(
        pairing_id=pairing_id,
        operator=operator,
        approver_id=approver_id,
        reason=reason,
    )
    raiseOnControlFailure(result)
    return {"success": True, "data": serialize_control_data(result.data)}


@pairing_router.post("/pairings/{pairing_id}/revoke", response_model=dict)
async def revoke_pairing(
    pairing_id: str,
    request: Request,
    payload: PairingRevokeRequest | None = Body(default=None),
    use_cases=Depends(get_channel_use_cases),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """撤销已批准配对（PRG-ACT-03）。

    仅 APPROVED 状态可撤销；reason 缺省填充 "revoked by {operator.user_id}"。
    对应控制面操作 ``pairing/revoke``。
    """
    operator = build_operator(current_user, request)
    reason = payload.reason if payload else None
    result = await use_cases.pairing_management.revokePairing(
        pairing_id=pairing_id,
        operator=operator,
        reason=reason,
    )
    raiseOnControlFailure(result)
    return {"success": True, "data": serialize_control_data(result.data)}