"""Trash 子域 Router。

外部系统限界上下文的回收站管理 API，覆盖回收站列表查询 / 恢复软删除资源 /
物理删除 / 清理过期回收站。所有端点通过 ``create_use_cases_from_db`` 装配
use_cases，经 ``trash_service`` 端口调用用例。

回收站为高危操作，所有端点使用 ``get_admin_user`` 鉴权。Request Schema 与
Input DTO 不共享类，Router 内显式构造 DTO，操作者字段（``restored_by`` /
``deleted_by`` / ``purged_by``）由 ``current_user.uid`` 填充。Router 内不
try/except 领域异常，由全局异常处理器统一处理。

路径顺序（关键，来自 FastAPI 路由匹配规则）：静态路径端点（``GET ""`` /
``POST "/purge"``）必须在动态路径端点（``POST "/{resource_type}/{resource_id}/restore"``
/ ``DELETE "/{resource_type}/{resource_id}"``）之前声明。

``ResourceType`` 枚举值与 ``TrashService._RESOURCE_REPO_MAP`` 的 key 对齐，
在边界层拦截非法资源类型（FastAPI 自动返回 422），同时在 OpenAPI 文档中
暴露支持的资源类型列表。
"""

from __future__ import annotations

from datetime import datetime
from enum import StrEnum
from typing import Any

from fastapi import APIRouter, Depends, Path, Query
from pydantic import BaseModel, ConfigDict, 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.trash import (
    HardDeleteInput,
    ListTrashInput,
    PurgeTrashInput,
    RestoreInput,
)
from yuxi.storage.postgres.models_business import User

from server.utils.auth_middleware import get_admin_user, get_db

trash_router = APIRouter(
    prefix="/trash",
    tags=["external-systems-trash"],
)


# ---------------- 边界层校验枚举（与 TrashService._RESOURCE_REPO_MAP 对齐） ----------------


class ResourceType(StrEnum):
    """回收站支持的资源类型。

    值与 ``TrashService._RESOURCE_REPO_MAP`` 的 key 一一对应，
    新增资源类型时需同步更新此处与 service 层映射。
    """

    SYSTEM = "system"
    ENVIRONMENT = "environment"
    TOOL = "tool"
    TOKEN = "token"
    ASSET = "asset"
    WEBHOOK_SUBSCRIPTION = "webhook_subscription"
    QUOTA = "quota"
    NOTIFICATION_CHANNEL = "notification_channel"
    SECRET_ROTATION_POLICY = "secret_rotation_policy"
    ACCESS_RULE = "access_rule"
    TEST_CASE = "test_case"


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


class PurgeTrashRequest(BaseModel):
    """清理过期回收站请求体。字段对齐 ``PurgeTrashInput``。"""

    model_config = ConfigDict(frozen=True)

    older_than_days: int = Field(default=30, ge=1)


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


@trash_router.get("", response_model=dict)
async def list_trash(
    resource_type: ResourceType | None = Query(None, description="资源类型过滤；不传时返回各类型计数摘要"),
    limit: int = Query(50, ge=1, le=200),
    offset: int = Query(0, ge=0),
    start_time: datetime | None = Query(None, description="仅明细模式生效（需传 resource_type）"),
    end_time: datetime | None = Query(None, description="仅明细模式生效（需传 resource_type）"),
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """查询回收站列表。

    - 不传 ``resource_type``：返回各类型计数摘要（``by_type``），``items`` 为空
    - 传 ``resource_type``：返回指定类型的软删除记录明细，``start_time``/``end_time`` 生效
    """
    use_cases = create_use_cases_from_db(db)
    input_dto = ListTrashInput(
        resource_type=resource_type.value if resource_type is not None else None,
        limit=limit,
        offset=offset,
        start_time=start_time,
        end_time=end_time,
    )
    output = await use_cases.trash_service.list_trash(input_dto)
    return {"success": True, "data": output.model_dump()}


@trash_router.post("/purge", response_model=dict)
async def purge_trash(
    payload: PurgeTrashRequest,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """清理过期回收站（物理删除超过保留期的软删除资源）。

    ``purged_by`` 由当前管理员填充。
    """
    use_cases = create_use_cases_from_db(db)
    input_dto = PurgeTrashInput(
        older_than_days=payload.older_than_days,
        purged_by=current_user.uid,
    )
    output = await use_cases.trash_service.purge(input_dto)
    return {"success": True, "data": output.model_dump()}


@trash_router.post("/{resource_type}/{resource_id}/restore", response_model=dict)
async def restore_resource(
    resource_type: ResourceType,
    resource_id: int = Path(..., ge=1),
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """恢复软删除资源。

    ``restored_by`` 由当前管理员填充。
    """
    use_cases = create_use_cases_from_db(db)
    input_dto = RestoreInput(
        resource_type=resource_type.value,
        resource_id=resource_id,
        restored_by=current_user.uid,
    )
    output = await use_cases.trash_service.restore(input_dto)
    return {"success": True, "data": output.model_dump()}


@trash_router.delete("/{resource_type}/{resource_id}", response_model=dict)
async def hard_delete_resource(
    resource_type: ResourceType,
    resource_id: int = Path(..., ge=1),
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """物理删除回收站中的资源（不可恢复）。

    ``deleted_by`` 由当前管理员填充。
    """
    use_cases = create_use_cases_from_db(db)
    input_dto = HardDeleteInput(
        resource_type=resource_type.value,
        resource_id=resource_id,
        deleted_by=current_user.uid,
    )
    output = await use_cases.trash_service.hard_delete(input_dto)
    return {"success": True, "data": output.model_dump()}