"""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。
"""

from __future__ import annotations

from datetime import datetime
from typing import Any

from fastapi import APIRouter, Depends, 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"],
)


# ---------------- 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: str | None = Query(None),
    limit: int = Query(50, ge=1, le=200),
    offset: int = Query(0, ge=0),
    start_time: datetime | None = Query(None),
    end_time: datetime | None = Query(None),
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """查询回收站列表（支持按资源类型过滤）。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = ListTrashInput(
        resource_type=resource_type,
        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: str,
    resource_id: int,
    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,
        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: str,
    resource_id: int,
    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,
        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()}