"""HealthCheck 子域 Router。

外部系统限界上下文的健康检查查询 API，覆盖全局最新状态一览 /
状态聚合统计 / 系统跨环境状态 / 系统最新状态 / 故障系统列表 /
未探测系统列表 / 过期记录清理。
所有端点通过 ``create_use_cases_from_db`` 装配 use_cases，
经 ``health_check_service`` 端口调用用例。

路径顺序约束：静态路径（latest/stats/failing/unchecked/old-records）
必须在动态路径 /by-system/{system_id} 之前声明。

认证策略：
- 查询类端点使用 get_required_user（支持 JWT + API Key 双模认证）
- 清理端点使用 get_admin_user
"""

from __future__ import annotations

from datetime import datetime
from typing import Any, Literal

from fastapi import APIRouter, Depends, Path, Query
from pydantic import BaseModel, Field
from sqlalchemy.ext.asyncio import AsyncSession
from yuxi.external_systems.infrastructure.container import create_use_cases_from_db
from yuxi.external_systems.use_cases.dto.health_check import (
    CountByStatusInput,
    DeleteOldRecordsInput,
    GetLatestBySystemInput,
    ListBySystemInput,
    ListFailingInput,
    ListLatestHealthInput,
    ListUncheckedInput,
    TriggerSystemHealthCheckInput,
)
from yuxi.storage.postgres.models_business import User

from server.utils.auth_middleware import get_admin_user, get_db, get_required_user

health_check_router = APIRouter(prefix="/health-checks", tags=["external-systems-health-check"])


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


# ---- 静态路径端点（必须在动态路径 /by-system/{system_id} 之前声明） ----


@health_check_router.get("/latest", response_model=dict)
async def list_latest_health(
    system_ids: list[int] | None = Query(None, description="按系统 ID 过滤（逗号分隔）"),
    health_status: Literal["healthy", "auth_failure", "connectivity_issue", "not_checked"] | None = Query(
        None, description="健康状态：healthy/auth_failure/connectivity_issue/not_checked"
    ),
    limit: int = Query(20, ge=1, le=100),
    offset: int = Query(0, ge=0),
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_required_user),
) -> dict[str, Any]:
    """全局最新健康状态一览。每个系统仅取最近一条记录。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = ListLatestHealthInput(
        system_ids=system_ids,
        health_status=health_status,
        limit=limit,
        offset=offset,
    )
    output = await use_cases.health_check_service.list_latest(input_dto)
    return {"success": True, "data": output.model_dump()}


@health_check_router.get("/stats", response_model=dict)
async def count_by_status(
    system_ids: list[int] | None = Query(None, description="按系统 ID 过滤（逗号分隔）"),
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_required_user),
) -> dict[str, Any]:
    """按状态聚合统计。返回 4 状态分组计数 + total。

    统计口径：每个系统取其最近一条健康检查记录的状态进行分组。
    ``not_checked`` 表示最近记录状态为 not_checked 的系统数，
    **非**从未探测的系统数（后者使用 ``/unchecked`` 端点）。
    ``total`` 为有健康检查记录的系统总数，非全部外部系统数。
    """
    use_cases = create_use_cases_from_db(db)
    input_dto = CountByStatusInput(system_ids=system_ids)
    output = await use_cases.health_check_service.count_by_status(input_dto)
    return {"success": True, "data": output.model_dump()}


@health_check_router.get("/failing", response_model=dict)
async def list_failing(
    health_status: Literal["auth_failure", "connectivity_issue"] = Query(
        "auth_failure",
        description="故障状态过滤：auth_failure / connectivity_issue",
    ),
    system_ids: list[int] | None = Query(None, description="按系统 ID 过滤（逗号分隔）"),
    limit: int = Query(100, ge=1, le=500),
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_required_user),
) -> dict[str, Any]:
    """故障系统列表。通过 list_latest(health_status=...) 参数化查询。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = ListFailingInput(
        health_status=health_status,
        system_ids=system_ids,
        limit=limit,
    )
    output = await use_cases.health_check_service.list_failing(input_dto)
    return {"success": True, "data": output.model_dump()}


@health_check_router.get("/unchecked", response_model=dict)
async def list_unchecked(
    system_ids: list[int] = Query(..., min_length=1, description="待检查的系统 ID 列表（逗号分隔）"),
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_required_user),
) -> dict[str, Any]:
    """未探测系统列表。返回传入 system_ids 中无记录的子集。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = ListUncheckedInput(system_ids=system_ids)
    output = await use_cases.health_check_service.list_unchecked(input_dto)
    return {"success": True, "data": output.model_dump()}


@health_check_router.delete("/old-records", response_model=dict)
async def delete_old_records(
    before: datetime = Query(..., description="清理此时间之前的记录（ISO 8601 格式）"),
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """清理过期记录（软删除）。按 checked_at 过滤，记录操作人以备审计。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = DeleteOldRecordsInput(before=before, deleted_by=current_user.uid)
    output = await use_cases.health_check_service.delete_old_records(input_dto)
    return {"success": True, "data": output.model_dump()}


# ---- 动态路径端点（最后声明） ----


@health_check_router.get("/by-system/{system_id}", response_model=dict)
async def list_by_system(
    system_id: int = Path(ge=1),
    env_key: str | None = Query(None, max_length=32, description="按环境过滤"),
    limit: int = Query(20, ge=1, le=100),
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_required_user),
) -> dict[str, Any]:
    """系统跨环境健康状态。每个 env_key 仅返回最近一条记录。

    指定 ``env_key`` 时仅返回该环境的最新记录；不指定时返回全部环境的最新记录。
    """
    use_cases = create_use_cases_from_db(db)
    input_dto = ListBySystemInput(
        system_id=system_id,
        env_key=env_key,
        limit=limit,
    )
    output = await use_cases.health_check_service.list_by_system(input_dto)
    return {"success": True, "data": output.model_dump()}


@health_check_router.get("/by-system/{system_id}/latest", response_model=dict)
async def get_latest_by_system(
    system_id: int = Path(ge=1),
    env_key: str | None = Query(None, max_length=32, description="环境标识（不传则跨 env 取最近一条）"),
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_required_user),
) -> dict[str, Any]:
    """系统最新健康状态。指定 env_key 时按 env 查询，否则跨 env 取最近一条。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = GetLatestBySystemInput(system_id=system_id, env_key=env_key)
    data = await use_cases.health_check_service.get_latest_by_system(input_dto)
    return {"success": True, "data": data}


# ---- 系统级健康检查触发（管理员） ----


class _TriggerSystemHealthCheckBody(BaseModel):
    """触发系统级健康检查请求体。"""

    env_key: str | None = Field(default=None, max_length=32, description="环境标识（不传则用默认环境）")


@health_check_router.post("/systems/{system_id}", response_model=dict)
async def trigger_system_health_check(
    system_id: int = Path(ge=1),
    body: _TriggerSystemHealthCheckBody | None = None,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """触发系统级健康检查。

    自动选取该系统下第一个启用的系统级工具执行探测。
    若系统无可用工具，返回 400 错误（提示用户先配置工具）。
    """
    use_cases = create_use_cases_from_db(db)
    input_dto = TriggerSystemHealthCheckInput(
        system_id=system_id,
        env_key=body.env_key if body else None,
        triggered_by=current_user.uid,
    )
    output = await use_cases.tool_service.trigger_system_health_check(input_dto)
    return {"success": True, "data": output.model_dump()}