"""프로젝트 집계 항목 복사본 길 — `/api/projects/{id}/items…` (PLAN 25-1b · 25-2b · 25-2e).

    GET  …/items                      목록(이름 · 원본 · 가져온날 · 마스터 바뀜)
    POST …/items {summary_item}       미리 가져오기(구조물에 안 이은 항목)
    GET  …/items/{폴더}/{종류}         {종류, 판, 내용}
    PUT  …/items/{폴더}/{종류}         {판, 내용} — 판이 다르면 409 · 면적 · 재료는 서버 계산값
    POST …/items/{폴더}/refresh        새로 가져오기(입력값 · 고른자재는 같은 키면 살림)
    POST …/items/{폴더}/calc           복사본만으로 계산(세 비목 · 계 · 빠진 입력)
종류 = 도면 · 면적 · 재료 · 자재조합 · 입력연결 · 입력값 · 고른자재.
⚠ 등록은 `main.py`(로그인만) — 프로젝트 권한(같은 회사)은 여기서 `_project` 로 봄(403 · 404).
"""

from __future__ import annotations

import asyncio
from typing import Any, Literal

from fastapi import APIRouter, Depends, HTTPException
from pydantic import BaseModel

from common_util import common_util_spreadsheet as spreadsheet
from common_util.common_util_auth import verify_session
from common_util.common_util_summary_item import parse_summary_item
from M02_MasterTemplete import M02_Item_Copy as copies
from M02_MasterTemplete import M02_MasterTemplete_Router_Layers as layer_routes

router = APIRouter(prefix="/api/projects", tags=["M02 Project Items"])

Kind = Literal["도면", "면적", "재료", "자재조합", "입력연결", "입력값", "고른자재"]


class WriteBody(BaseModel):
    판: str | None = None
    내용: Any


class PrefetchBody(BaseModel):
    summary_item: dict[str, Any]


async def _root(session: dict[str, Any], project_id: str):
    return (await layer_routes._project(session, project_id))["root"]


async def _run(fn, *args):
    try:
        return await asyncio.to_thread(fn, *args)
    except copies.Stale as error:
        raise HTTPException(
            status_code=409, detail={"message": str(error), "판": error.current}
        ) from error
    except LookupError as error:
        raise HTTPException(status_code=404, detail=str(error)) from error
    except ValueError as error:
        raise HTTPException(status_code=400, detail=str(error)) from error


@router.get("/{project_id}/items")
async def list_items(
    project_id: str, session: dict[str, Any] = Depends(verify_session)
) -> dict[str, Any]:
    return {"항목": await _run(copies.list_items, await _root(session, project_id))}


@router.post("/{project_id}/items")
async def prefetch_item(
    project_id: str, body: PrefetchBody, session: dict[str, Any] = Depends(verify_session)
) -> dict[str, Any]:
    try:
        item = parse_summary_item(body.summary_item)
    except ValueError as error:
        raise HTTPException(status_code=400, detail=str(error)) from error
    return await _run(copies.prefetch, await _root(session, project_id), item)


@router.get("/{project_id}/items/{folder}/{kind}")
async def read_item_file(
    project_id: str, folder: str, kind: Kind, session: dict[str, Any] = Depends(verify_session)
) -> dict[str, Any]:
    return await _run(copies.read_file, await _root(session, project_id), folder, kind)


def _recalc(document: dict) -> dict:
    try:
        return spreadsheet.with_server_values(document)
    except spreadsheet.RecalcError as error:
        raise HTTPException(status_code=503, detail=str(error)) from error


@router.put("/{project_id}/items/{folder}/{kind}")
async def write_item_file(
    project_id: str,
    folder: str,
    kind: Kind,
    body: WriteBody,
    session: dict[str, Any] = Depends(verify_session),
) -> dict[str, Any]:
    root = await _root(session, project_id)
    return await _run(copies.write_file, root, folder, kind, body.판, body.내용, _recalc)


@router.post("/{project_id}/items/{folder}/refresh")
async def refresh_item(
    project_id: str, folder: str, session: dict[str, Any] = Depends(verify_session)
) -> dict[str, Any]:
    return await _run(copies.refresh, await _root(session, project_id), folder)


@router.post("/{project_id}/items/{folder}/calc")
async def calc_item(
    project_id: str, folder: str, session: dict[str, Any] = Depends(verify_session)
) -> dict[str, Any]:
    return await _run(copies.calc, await _root(session, project_id), folder)