"""Outbox 管理路由（OBX-01~OBX-08 + P0缺口）。

统一采用模板 A（控制面端口路由），鉴权依赖 get_admin_user，调用
use_cases.outbox_management.<method>，raiseOnControlFailure 转译失败，
serialize_control_data 序列化响应。

路径设计：静态跨渠道查询（/messages / /stats / /dead-letter / /retry-policy
/dead-letter/batch-retry / /dead-letter/batch-delete）先于动态路径
（/messages/{outbox_id} / /dead-letter/{outbox_id} / /messages/{outbox_id}/retry）
声明（规范 §6.5），避免静态路径被动态参数捕获。子 router 自身 prefix 为 ``/outbox``，
根前缀 ``/channels`` 由 ``channels_router`` 聚合 router 统一追加。

端点清单（对应《07-投递基础设施域设计方案》§2.1 + P0缺口补全）：
    - GET    /outbox/messages                          OBX-01 listOutboxEntries
    - GET    /outbox/stats                             OBX-02 getOutboxStats
    - GET    /outbox/trend                            OBX-TREND getOutboxTrend
    - GET    /outbox/dead-letter                       OBX-04 listDeadLetterOutboxEntries
    - GET    /outbox/retry-policy                      OBX-07 getOutboxRetryPolicy
    - POST   /outbox/dead-letter/batch-retry           OBX-DL-BATCH-RETRY 批量重投死信
    - POST   /outbox/dead-letter/batch-delete          OBX-DL-BATCH-DELETE 批量清除死信
    - GET    /outbox/dead-letter/export               OBX-DL-EXPORT export_dead_letter
    - PUT    /outbox/retry-policy                      OBX-POLICY-UPDATE 更新重试策略
    - GET    /outbox/messages/{outbox_id}              OBX-03 getOutboxEntry
    - DELETE /outbox/dead-letter/{outbox_id}           OBX-05 deleteDeadLetterOutboxEntry
    - POST   /outbox/messages/{outbox_id}/retry        OBX-08 retryOutboxEntry
"""

from __future__ import annotations

from typing import Any, Literal

from fastapi import APIRouter, Depends, Query, Request
from pydantic import BaseModel, ConfigDict, Field, field_validator
from yuxi.channels.contract.dtos.channel import ChannelType
from yuxi.channels.contract.dtos.outbox import (
    DeadLetterExportCmd,
    OutboxQueryFilter,
    OutboxStatus,
    OutboxTrendQuery,
    RetryPolicySnapshot,
)
from yuxi.storage.postgres.models_business import User

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

outbox_router = APIRouter(prefix="/outbox", tags=["channels-outbox"])


class UpdateRetryPolicyRequest(BaseModel):
    """更新重试策略请求体。"""

    model_config = ConfigDict(frozen=True)

    max_retry: int = Field(..., ge=1, le=20, description="最大重试次数")
    ttl_seconds: int = Field(..., ge=60, le=2592000, description="条目存活时间（秒）")
    retry_backoff_schedule: list[int] = Field(
        ...,
        min_length=1,
        description="指数退避序列（秒），非空正整数列表",
    )

    @field_validator("retry_backoff_schedule")
    @classmethod
    def _validate_backoff_schedule(cls, v: list[int]) -> list[int]:
        """校验退避序列为正整数，与 handler 层校验保持一致。"""
        if any(item <= 0 for item in v):
            raise ValueError("retry_backoff_schedule must contain only positive integers")
        return v


# ---------------- 静态路径端点（须先于动态路径声明） ----------------


@outbox_router.get("/messages", response_model=dict)
async def list_outbox_messages(
    request: Request,
    channel_type: ChannelType | None = Query(default=None, description="按渠道类型过滤"),
    channel_account_id: str | None = Query(default=None, description="按渠道账户 ID 过滤，支持模糊搜索"),
    status: OutboxStatus | None = Query(default=None, description="按状态过滤"),
    message_id: str | None = Query(default=None, description="按消息 ID 模糊搜索"),
    channel_msg_id: str | None = Query(default=None, description="按渠道侧消息 ID 模糊搜索"),
    channel_session_id: str | None = Query(default=None, description="按渠道会话 ID 过滤"),
    last_error: str | None = Query(default=None, description="按错误关键词筛选"),
    created_after: str | None = Query(default=None, description="创建时间下界（ISO 8601）"),
    created_before: str | None = Query(default=None, description="创建时间上界（ISO 8601）"),
    retry_count_min: int | None = Query(
        default=None, ge=0, description="最小重试次数下界（含），用于筛选已发生重试的条目"
    ),
    limit: int = Query(default=100, ge=1, le=200, 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 outbox 消息（OBX-01）。对应控制面操作 outbox/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_filter = OutboxQueryFilter(
        channel_type=channel_type,
        status=status,
        channel_session_id=channel_session_id,
        created_after=created_after_dt,
        created_before=created_before_dt,
        retry_count_min=retry_count_min,
        channel_account_id_like=channel_account_id,
        message_id_like=message_id,
        channel_msg_id_like=channel_msg_id,
        last_error_like=last_error,
    )
    result = await use_cases.outbox_management.listOutboxEntries(
        query_filter,
        operator=operator,
        limit=limit,
        offset=offset,
    )
    raiseOnControlFailure(result)
    return {"success": True, "data": serialize_control_data(result.data)}


@outbox_router.get("/stats", response_model=dict)
async def get_outbox_stats(
    request: Request,
    channel_type: ChannelType | None = Query(default=None, description="按渠道类型过滤"),
    channel_account_id: str | None = Query(default=None, description="按渠道账户 ID 过滤"),
    use_cases=Depends(get_channel_use_cases),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """查询 outbox 统计（OBX-02）。对应控制面操作 outbox/stats。"""
    operator = build_operator(current_user, request)
    result = await use_cases.outbox_management.getOutboxStats(
        channel_type,
        operator=operator,
        channel_account_id=channel_account_id,
    )
    raiseOnControlFailure(result)
    return {"success": True, "data": serialize_control_data(result.data)}


@outbox_router.get("/trend", response_model=dict)
async def get_outbox_trend(
    request: Request,
    start_time: str = Query(..., description="起始时间（ISO 8601，含）"),
    end_time: str = Query(..., description="结束时间（ISO 8601，含）"),
    channel_type: ChannelType | None = Query(default=None, description="按渠道类型过滤"),
    channel_account_id: str | None = Query(default=None, description="按渠道账户 ID 过滤"),
    granularity: Literal["minute", "hour", "day"] = Query(default="hour", description="时间粒度"),
    metric: Literal["queue_depth", "retry_count", "dead_count"] = Query(default="queue_depth", description="度量指标"),
    use_cases=Depends(get_channel_use_cases),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """查询 outbox 投递积压趋势（OBX-TREND）。对应控制面操作 outbox/trend。

    按时间粒度聚合 outbox 条目的时间序列数据点，支持 ``queue_depth`` /
    ``retry_count`` / ``dead_count`` 三种度量指标。
    """
    operator = build_operator(current_user, request)
    start_time_dt = parse_datetime("start_time", start_time)
    end_time_dt = parse_datetime("end_time", end_time)
    query = OutboxTrendQuery(
        start_time=start_time_dt,
        end_time=end_time_dt,
        channel_type=channel_type,
        channel_account_id=channel_account_id,
        granularity=granularity,
        metric=metric,
    )
    result = await use_cases.outbox_management.getOutboxTrend(query, operator=operator)
    raiseOnControlFailure(result)
    return {"success": True, "data": serialize_control_data(result.data)}


@outbox_router.get("/dead-letter", response_model=dict)
async def list_dead_letter_outbox(
    request: Request,
    channel_type: ChannelType | None = Query(default=None, description="按渠道类型过滤"),
    channel_account_id: str | None = Query(default=None, description="按渠道账户 ID 过滤，支持模糊搜索"),
    message_id: str | None = Query(default=None, description="按消息 ID 模糊搜索"),
    channel_msg_id: str | None = Query(default=None, description="按渠道侧消息 ID 模糊搜索"),
    channel_session_id: str | None = Query(default=None, description="按渠道会话 ID 过滤"),
    last_error: str | None = Query(default=None, description="按错误关键词筛选"),
    created_after: str | None = Query(default=None, description="创建时间下界（ISO 8601）"),
    created_before: str | None = Query(default=None, description="创建时间上界（ISO 8601）"),
    retry_count_min: int | None = Query(
        default=None, ge=0, description="最小重试次数下界（含），用于筛选已发生重试的条目"
    ),
    limit: int = Query(default=100, ge=1, le=200, 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]:
    """查询死信队列（OBX-04）。对应控制面操作 outbox/dead_letter_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_filter = OutboxQueryFilter(
        channel_type=channel_type,
        channel_session_id=channel_session_id,
        created_after=created_after_dt,
        created_before=created_before_dt,
        retry_count_min=retry_count_min,
        channel_account_id_like=channel_account_id,
        message_id_like=message_id,
        channel_msg_id_like=channel_msg_id,
        last_error_like=last_error,
    )
    result = await use_cases.outbox_management.listDeadLetterOutboxEntries(
        query_filter,
        operator=operator,
        limit=limit,
        offset=offset,
    )
    raiseOnControlFailure(result)
    return {"success": True, "data": serialize_control_data(result.data)}


@outbox_router.get("/retry-policy", response_model=dict)
async def get_outbox_retry_policy(
    request: Request,
    use_cases=Depends(get_channel_use_cases),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """查询 outbox 重试策略（OBX-07）。对应控制面操作 outbox/retry_policy。

    返回当前生效的 OutboxConfig 快照（通过 holder 读取，反映热更新后的值）。
    可通过 ``PUT /outbox/retry-policy`` 热更新策略参数。
    """
    operator = build_operator(current_user, request)
    result = await use_cases.outbox_management.getOutboxRetryPolicy(operator=operator)
    raiseOnControlFailure(result)
    return {"success": True, "data": serialize_control_data(result.data)}


class DeadLetterBatchCmd(BaseModel):
    """死信批量操作请求体。

    ``outbox_ids`` 为 ``None``（未传字段或未传 body）时作用于全部死信条目；
    非空时仅作用于指定条目。显式传空列表 ``[]`` 表示"不操作任何条目"，
    与 ``None`` 语义不同，避免误触全部操作。
    """

    model_config = ConfigDict(frozen=True)
    outbox_ids: list[str] | None = Field(default=None, description="指定死信条目 ID 列表；为 None 时作用于全部")


@outbox_router.post("/dead-letter/batch-retry", response_model=dict)
async def batch_retry_dead_letter(
    request: Request,
    cmd: DeadLetterBatchCmd | None = None,
    use_cases=Depends(get_channel_use_cases),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """批量重投死信条目（OBX-DL-BATCH-RETRY）。

    ``outbox_ids`` 为 ``None`` 时重投全部死信条目，非空时仅重投指定条目。
    对应控制面操作 ``outbox/batch_retry``。
    """
    operator = build_operator(current_user, request)
    outbox_ids = cmd.outbox_ids if cmd else None
    result = await use_cases.outbox_management.batchRetryDeadLetter(operator=operator, outbox_ids=outbox_ids)
    raiseOnControlFailure(result)
    return {"success": True, "data": serialize_control_data(result.data)}


@outbox_router.post("/dead-letter/batch-delete", response_model=dict)
async def batch_delete_dead_letter(
    request: Request,
    cmd: DeadLetterBatchCmd | None = None,
    use_cases=Depends(get_channel_use_cases),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """批量清除死信条目（OBX-DL-BATCH-DELETE）。

    ``outbox_ids`` 为 ``None`` 时删除全部死信条目（逻辑删除，置 is_deleted=1、
    deleted_at=now()，保留审计痕迹），非空时仅删除指定条目。
    对应控制面操作 ``outbox/batch_delete``。
    """
    operator = build_operator(current_user, request)
    outbox_ids = cmd.outbox_ids if cmd else None
    result = await use_cases.outbox_management.batchDeleteDeadLetter(operator=operator, outbox_ids=outbox_ids)
    raiseOnControlFailure(result)
    return {"success": True, "data": serialize_control_data(result.data)}


@outbox_router.get("/dead-letter/export", response_model=dict)
async def export_dead_letter(
    request: Request,
    channel_type: ChannelType | None = Query(default=None, description="按渠道类型过滤"),
    created_after: str | None = Query(default=None, description="创建时间下界（ISO 8601）"),
    created_before: str | None = Query(default=None, description="创建时间上界（ISO 8601）"),
    export_format: Literal["json", "csv"] = Query(default="json", alias="format", description="导出格式（json / csv）"),
    limit: int = Query(default=10000, ge=1, le=100000, description="导出条目上限，防止大规模死信队列 OOM"),
    use_cases=Depends(get_channel_use_cases),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """导出死信条目（OBX-DL-EXPORT）。对应控制面操作 outbox/dead_letter_export。

    按过滤条件查询 DEAD 状态 outbox 条目并序列化为 ``json`` / ``csv`` 格式。
    ``format=json`` 时 ``content`` 为记录数组；``format=csv`` 时 ``content``
    为 CSV 字符串（含表头与 CSV injection 防护）。``limit`` 限制单次导出条目数
    （默认 10000），防止大规模死信队列 OOM。
    """
    operator = build_operator(current_user, request)
    created_after_dt = parse_datetime("created_after", created_after)
    created_before_dt = parse_datetime("created_before", created_before)
    cmd = DeadLetterExportCmd(
        channel_type=channel_type,
        created_after=created_after_dt,
        created_before=created_before_dt,
        format=export_format,
        limit=limit,
    )
    result = await use_cases.outbox_management.exportDeadLetters(cmd, operator=operator)
    raiseOnControlFailure(result)
    return {"success": True, "data": serialize_control_data(result.data)}


@outbox_router.put("/retry-policy", response_model=dict)
async def update_outbox_retry_policy(
    payload: UpdateRetryPolicyRequest,
    request: Request,
    use_cases=Depends(get_channel_use_cases),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """更新 outbox 重试策略（OBX-POLICY-UPDATE）。

    运行时调整重试参数，用于紧急故障场景下临时调整重试行为。
    对应控制面操作 ``outbox/update_retry_policy``。
    """
    operator = build_operator(current_user, request)
    policy = RetryPolicySnapshot(
        max_retry=payload.max_retry,
        ttl_seconds=payload.ttl_seconds,
        retry_backoff_schedule=tuple(payload.retry_backoff_schedule),
    )
    result = await use_cases.outbox_management.updateRetryPolicy(
        policy=policy,
        operator=operator,
    )
    raiseOnControlFailure(result)
    return {"success": True, "data": serialize_control_data(result.data)}


# ---------------- 动态路径端点 ----------------


@outbox_router.get("/messages/{outbox_id}", response_model=dict)
async def get_outbox_message(
    outbox_id: str,
    request: Request,
    use_cases=Depends(get_channel_use_cases),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """查询 outbox 消息详情（OBX-03）。对应控制面操作 outbox/get。"""
    operator = build_operator(current_user, request)
    result = await use_cases.outbox_management.getOutboxEntry(
        outbox_id,
        operator=operator,
    )
    raiseOnControlFailure(result)
    return {"success": True, "data": serialize_control_data(result.data)}


@outbox_router.delete("/dead-letter/{outbox_id}", response_model=dict)
async def delete_dead_letter_outbox(
    outbox_id: str,
    request: Request,
    use_cases=Depends(get_channel_use_cases),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """清除死信条目（OBX-05，逻辑删除）。对应控制面操作 outbox/dead_letter_delete。

    采用逻辑删除（置 is_deleted=1、deleted_at=now()），保留审计痕迹。
    仅允许对 dead 状态条目执行删除，非 dead 状态抛 RuleViolationError。
    """
    operator = build_operator(current_user, request)
    result = await use_cases.outbox_management.deleteDeadLetterOutboxEntry(
        outbox_id,
        operator=operator,
    )
    raiseOnControlFailure(result)
    return {
        "success": True,
        "data": serialize_control_data(result.data),
    }


@outbox_router.post("/messages/{outbox_id}/retry", response_model=dict)
async def retry_outbox_message(
    outbox_id: str,
    request: Request,
    use_cases=Depends(get_channel_use_cases),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """手动重投 outbox 消息（OBX-08）。对应控制面操作 outbox/retry。

    仅允许对 failed/sent_unconfirmed 状态条目重投；dead 状态抛
    RuleViolationError（单条重投不可复活死信，INV-3；批量重投死信请使用
    ``POST /outbox/dead-letter/batch-retry``，通过 ``revive()`` 受控复活）。
    """
    operator = build_operator(current_user, request)
    result = await use_cases.outbox_management.retryOutboxEntry(
        outbox_id,
        operator=operator,
    )
    raiseOnControlFailure(result)
    return {"success": True, "data": serialize_control_data(result.data)}