"""B08 3탭 토적표 길 (PLAN 61-3) — 읽기만, 아무 파일 · DB 에도 쓰지 않음.

    GET /api/projects/{id}/quantity/earthwork   측점별 횡단 설계 단면적 → 평균단면적법 토적표

단면적 = B06 횡단 설계 저장값(`cross_sections.data.design`) · 노선 = 확정 노선(없으면 최신 노선) ·
토량환산계수 = 유토곡선과 같은 `mixed_conversion_factors(quantity_settings)`.
"""

from __future__ import annotations

import asyncio
from typing import Any
from uuid import UUID

from fastapi import APIRouter, HTTPException

from B06_Section.B06_Section_Repository import (
    get_confirmed_route_context,
    get_cross_section_designs,
    get_workflow_route_context,
)
from B08_Quantity.B08_Quantity_Engine_Earthwork import StationArea, build_table
from B08_Quantity.B08_Quantity_Router_Hydro import _project_root
from common_util.common_util_project_settings import mixed_conversion_factors, quantity_settings
from config.config_db import get_db_pool

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


@router.get("/{project_id}/quantity/earthwork")
async def earthwork_table(project_id: UUID) -> dict[str, Any]:
    root = await _project_root(project_id)
    async with get_db_pool().acquire() as connection:
        context = await get_confirmed_route_context(connection, project_id)
        confirmed = context is not None
        context = context or await get_workflow_route_context(connection, project_id)
        if not context:
            raise HTTPException(status_code=404, detail="노선이 없습니다 — 노선 · 횡단 설계부터.")
        route_id = int(context["route_id"])
        rows = await get_cross_section_designs(connection, route_id)
    factors = await asyncio.to_thread(lambda: mixed_conversion_factors(quantity_settings(root)))
    stations = [StationArea.from_design(row["chainage_m"], row["design"]) for row in rows]
    return {**build_table(stations, factors), "route_id": route_id, "confirmed": confirmed}