"""Reports 聚合视图域 Router（RPT-05 / RPT-06 / RPT-ONEOFF-01 / RPT-ONEOFF-02）。

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.report_management.<method>，raiseOnControlFailure 转译失败，
serialize_control_data 序列化响应。

路径设计（静态先于动态，避免 /{report_id} 误捕获 /oneoff）：
    - POST   /reports/oneoff                      RPT-05 createOneoffReport
    - GET    /reports/oneoff                      RPT-ONEOFF-01 listOneoffReports
    - GET    /reports/oneoff/{task_id}/download   RPT-ONEOFF-02 downloadReport
    - POST   /reports/oneoff/{task_id}/retry      RPT-ONEOFF-RETRY retryReport
    - GET    /reports/{report_id}                 RPT-06 getReport

子 router 自身不设置 prefix，根前缀 ``/channels`` 由 ``channels_router``
聚合 router 统一追加。
"""

from __future__ import annotations

from datetime import datetime, timezone
from typing import Any, Literal

from fastapi import APIRouter, Depends, Query, Request
from pydantic import BaseModel, ConfigDict, Field
from yuxi.channels.contract.dtos.report import (
    DEFAULT_LIST_LIMIT,
    MAX_LIST_LIMIT,
    MIN_LIST_LIMIT,
)
from yuxi.channels.contract.errors import ValidationError
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

reports_router = APIRouter(tags=["channels-reports"])


class CreateOneoffReportRequest(BaseModel):
    """创建一次性报告请求体（RPT-05）。

    字段：
        report_type: 报告类型枚举（5 个值）。
        params: 报告生成参数（时间范围 / 过滤条件等）。
        run_at: 计划执行时间（ISO 8601 字符串），为 None 时立即执行。
    """

    model_config = ConfigDict(frozen=True)

    report_type: Literal[
        "message_stats",
        "session_stats",
        "account_stats",
        "delivery_stats",
        "dashboard_overview",
    ] = Field(..., description="报告类型")
    params: dict[str, Any] = Field(default_factory=dict, description="报告生成参数")
    run_at: str | None = Field(default=None, description="计划执行时间（ISO 8601），为空时立即执行")


@reports_router.post("/reports/oneoff", response_model=dict)
async def create_oneoff_report(
    request: Request,
    body: CreateOneoffReportRequest,
    use_cases=Depends(get_channel_use_cases),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """创建一次性报告（RPT-05）。对应控制面操作 reports/create_oneoff。

    异步生成报告：创建 pending 状态报告记录 + scheduler 一次性任务，
    worker 进程通过 ChannelReportHandler 生成内容后状态变 ready。
    """
    operator = build_operator(current_user, request)
    # 时间参数统一在 Router 层校验格式与业务约束，与 list_oneoff_reports
    # 的 start_time / end_time 处理一致（FR-34 / RPT-05 @pre）：
    # - 格式校验：parse_datetime 翻译为 aware UTC datetime，非法格式抛
    #   ValidationError（400），避免原生异常在控制面管道内被兜底为 500。
    # - 过去时间校验：run_at 非空时不得为过去时间（Port 契约 @pre），
    #   避免创建永远不会触发的 scheduler 任务。
    # - datetime 直接透传至 UseCase（Port 契约要求 datetime | None），
    #   消除 str → datetime → str → datetime 的冗余往返转换。
    run_at_dt = parse_datetime("run_at", body.run_at)
    if run_at_dt is not None and run_at_dt <= datetime.now(timezone.utc):
        raise ValidationError(
            field="run_at",
            message="run_at must be a future time",
        )
    result = await use_cases.report_management.createOneoffReport(
        report_type=body.report_type,
        params=body.params,
        run_at=run_at_dt,
        operator=operator,
    )
    raiseOnControlFailure(result)
    return {"success": True, "data": serialize_control_data(result.data)}


@reports_router.get("/reports/oneoff", response_model=dict)
async def list_oneoff_reports(
    request: Request,
    status: Literal["pending", "generating", "ready", "failed"] | None = Query(default=None, description="按状态过滤"),
    report_type: Literal["message_stats", "session_stats", "account_stats", "delivery_stats", "dashboard_overview"] | None = Query(default=None, description="按报告类型过滤"),
    start_time: str | None = Query(default=None, description="起始时间（ISO 8601）"),
    end_time: str | None = Query(default=None, description="截止时间（ISO 8601）"),
    limit: int = Query(default=DEFAULT_LIST_LIMIT, ge=MIN_LIST_LIMIT, le=MAX_LIST_LIMIT, description="分页大小（1-200）"),
    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]:
    """列出一次性报告（RPT-ONEOFF-01）。对应控制面操作 reports/list_oneoff。

    分页查询报告列表，支持按状态 / 类型 / 时间范围过滤。
    """
    operator = build_operator(current_user, request)
    start_time_dt = parse_datetime("start_time", start_time)
    end_time_dt = parse_datetime("end_time", end_time)
    result = await use_cases.report_management.listOneoffReports(
        operator=operator,
        status=status,
        report_type=report_type,
        start_time=start_time_dt,
        end_time=end_time_dt,
        limit=limit,
        offset=offset,
    )
    raiseOnControlFailure(result)
    return {"success": True, "data": serialize_control_data(result.data)}


@reports_router.get("/reports/oneoff/{task_id}/download", response_model=dict)
async def download_oneoff_report(
    request: Request,
    task_id: str,
    use_cases=Depends(get_channel_use_cases),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """下载一次性报告（RPT-ONEOFF-02）。对应控制面操作 reports/download。

    根据 task_id 下载已就绪报告内容。未就绪（pending/generating）返回 409，
    失败（failed）返回 409。
    """
    operator = build_operator(current_user, request)
    result = await use_cases.report_management.downloadReport(
        task_id=task_id,
        operator=operator,
    )
    raiseOnControlFailure(result)
    return {"success": True, "data": serialize_control_data(result.data)}


@reports_router.post("/reports/oneoff/{task_id}/retry", response_model=dict)
async def retry_oneoff_report(
    request: Request,
    task_id: str,
    use_cases=Depends(get_channel_use_cases),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """重试失败报告（RPT-ONEOFF-RETRY）。对应控制面操作 reports/oneoff_retry。

    校验原报告 status=="failed" 后创建新 pending 报告并入队 scheduler
    任务，同时标记原报告 ``retried_at``。返回新旧 task_id。
    """
    operator = build_operator(current_user, request)
    result = await use_cases.report_management.retryReport(
        task_id=task_id,
        operator=operator,
    )
    raiseOnControlFailure(result)
    return {"success": True, "data": serialize_control_data(result.data)}


@reports_router.get("/reports/{report_id}", response_model=dict)
async def get_report(
    request: Request,
    report_id: str,
    use_cases=Depends(get_channel_use_cases),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """查询报告详情（RPT-06）。对应控制面操作 reports/get。

    返回报告完整信息（含 content / status / download_url）。
    """
    operator = build_operator(current_user, request)
    result = await use_cases.report_management.getReport(
        report_id=report_id,
        operator=operator,
    )
    raiseOnControlFailure(result)
    return {"success": True, "data": serialize_control_data(result.data)}