"""B08 좌측 패널 옵션 길(PLAN 122) — 배관 1본 길이 · 연암 / 경암 비율.

    GET /api/projects/{id}/quantity/options   지금 값
    PUT /api/projects/{id}/quantity/options   [저장] — 받은 칸만 정본 자리에 씀

1본 길이 = 프로젝트 층 M02 구조물집계표 변수 `파형강관_1본_m` 한 벌(98 `one_pipe_length` 이 읽는 자리 ·
M02 표 식 `[$파형강관_1본_m]` 도 같은 값) · 프로젝트 사본이 없으면 시스템 층 문서를 바탕으로 깔고 씀 ·
M02 [초기화]면 같이 되돌아감.
연암 % = `project_settings.json › quantity › rock_ratios_pct`(연암 · 경암 = 100 − 연암) · 기본 90 은
파일에 안 쓰고 읽을 때 채움(`soft_rock_pct`).
"""

from __future__ import annotations

import asyncio
from pathlib import Path
from typing import Any
from uuid import UUID

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

from B08_Quantity.B08_Quantity_Router_Hydro import _project_root
from B08_Quantity.B08_Quantity_Router_Summary import ONE_LENGTH_VAR, TABLE_NAME, one_pipe_length
from common_util.common_util_project_settings import quantity_settings, save_section, soft_rock_pct
from M02_MasterTemplete import M02_Template_Layers as layers

router = APIRouter(prefix="/api/projects", tags=["B08 Options"])


class OptionsSave(BaseModel):
    """빈칸(None) = 그 칸은 그대로."""

    one_pipe_length_m: float | None = Field(default=None, gt=0, le=100)
    soft_rock_pct: float | None = Field(default=None, ge=0, le=100)


def read_options(root: str | Path) -> dict[str, Any]:
    soft = soft_rock_pct(quantity_settings(root))
    return {
        "one_pipe_length_m": one_pipe_length(root),
        "rock_ratios_pct": {"연암": soft, "경암": 100.0 - soft},
    }


def _write_one_pipe(root: str | Path, value: float) -> None:
    """프로젝트 층 구조물집계표 변수 한 칸 — 판이 그새 바뀌었으면 `StaleTemplate`."""
    folder = layers.project_dir(root)
    found = layers.read_template(folder, "table", TABLE_NAME)
    version = found["판"] if found else None
    found = found or layers.read_template(layers.system_dir(), "table", TABLE_NAME)
    if found is None:
        raise HTTPException(status_code=404, detail=f"{TABLE_NAME} 양식이 없습니다 — M02 표부터.")
    document = found["문서"]
    document["변수"] = {**(document.get("변수") or {}), ONE_LENGTH_VAR: value}
    layers.write_template(
        folder, "table", TABLE_NAME, document, version=version, check_version=True
    )


def save_options(root: str | Path, body: OptionsSave) -> dict[str, Any]:
    if body.one_pipe_length_m is not None:
        _write_one_pipe(root, body.one_pipe_length_m)
    if body.soft_rock_pct is not None:
        soft = float(body.soft_rock_pct)
        ratios = {
            **(quantity_settings(root).get("rock_ratios_pct") or {}),
            "연암": soft,
            "경암": 100.0 - soft,
        }
        save_section(
            root, "quantity", {"rock_ratios_pct": ratios}, replace_keys=("rock_ratios_pct",)
        )
    return read_options(root)


@router.get("/{project_id}/quantity/options")
async def options_read(project_id: UUID) -> dict[str, Any]:
    root = await _project_root(project_id)
    return await asyncio.to_thread(read_options, root)


@router.put("/{project_id}/quantity/options")
async def options_save(project_id: UUID, body: OptionsSave) -> dict[str, Any]:
    root = await _project_root(project_id)
    try:
        return await asyncio.to_thread(save_options, root, body)
    except layers.StaleTemplate as error:
        raise HTTPException(
            status_code=409, detail="구조물집계표가 그새 바뀌었습니다 — 다시 열고 저장하세요."
        ) from error