"""B09 원가계산 라우터 — **사용자가 고친 값** 읽기·저장 (PLAN 12장 2차 · `B09_Estimation_Edits`).

⚠ `B09_Estimation_Router.py` 는 쪼개기 차례를 기다리는 중이라(브레인 판정) 새 문을 여기 둠.
⚠ 저장은 고친 값만 — 금액은 다음 조회 때 서버가 조립 뒤 고친 값을 얹어 **다시 계산**함.
"""

from __future__ import annotations

import logging
from typing import Any
from uuid import UUID

from fastapi import APIRouter
from fastapi.responses import JSONResponse
from pydantic import BaseModel, Field

from B09_Estimation.B09_Estimation_Edits import (
    EDITS_KEY,
    EditError,
    merge_changes,
    normalize,
)

logger = logging.getLogger(__name__)
router = APIRouter(prefix="/api/projects", tags=["B09 Estimation Edits"])


class EditChange(BaseModel):
    """고칠 칸 하나 — `value` 가 `null` 이면 그 칸을 지움(↺ 계산값으로 돌아감)."""

    section: str
    key: str
    value: Any = None


class EditRequest(BaseModel):
    changes: list[EditChange] = Field(default_factory=list)


@router.get("/{project_id}/estimation/edits")
async def get_edits(project_id: UUID) -> JSONResponse:
    """고친 값 한 벌 — 화면이 「사용자」 표시·↺ 를 붙이는 데 씀."""
    from B09_Estimation.B09_Estimation_Router import _build_for, _project_root_of
    from common_util.common_util_project_settings import estimation_settings

    root = await _project_root_of(project_id)
    settings = estimation_settings(root) if root else {}
    build = await _build_for(project_id)
    return JSONResponse(
        content={
            "status": "success",
            EDITS_KEY: normalize(settings.get(EDITS_KEY)),
            "skipped": list(getattr(build, "edit_skipped", [])),
        }
    )


@router.put("/{project_id}/estimation/edits")
async def put_edits(project_id: UUID, payload: EditRequest) -> JSONResponse:
    """고친 값 저장 — 칸마다 검사하고(값 없는 슬롯 등은 받지 않음) 구획째 갈아 끼움."""
    from B09_Estimation.B09_Estimation_Router import _build_for, _project_root_of
    from common_util.common_util_project_settings import estimation_settings, save_section

    root = await _project_root_of(project_id)
    if root is None:
        return JSONResponse(
            status_code=404,
            content={"status": "error", "message": "프로젝트 저장 폴더를 찾지 못했습니다."},
        )
    settings = estimation_settings(root)
    try:
        build = await _build_for(project_id)
        edits = merge_changes(
            settings.get(EDITS_KEY), build, [change.model_dump() for change in payload.changes]
        )
    except EditError as error:
        return JSONResponse(status_code=422, content={"status": "error", "message": str(error)})
    try:
        save_section(root, "estimation", {EDITS_KEY: edits}, replace_keys=(EDITS_KEY,))
    except Exception:
        logger.exception("B09 고친 값 저장 실패: project_id=%s", project_id)
        return JSONResponse(
            status_code=500,
            content={"status": "error", "message": "고친 값을 저장하지 못했습니다."},
        )
    return JSONResponse(content={"status": "success", EDITS_KEY: edits})