"""추천 후보 초기 종단 모으기(476) — `POST /route/initial` 결과에 `initial_profile` 을 붙임.

입력 모으기(DB · 파일) · 지문 · 저장본 = 여기 · 셈 조각 = `B05_Profile_Engine_InitialProfile`(머리에
흐름 · 응답 칸). `B05_Profile_Router_RouteInitial`(700줄)에서 나눔 — `compute_initial` 이 부름.
"""

from __future__ import annotations

import asyncio
import functools
import logging
import time
from pathlib import Path
from typing import Any
from uuid import UUID

from fastapi.responses import JSONResponse

from config.config_db import get_db_pool

logger = logging.getLogger(__name__)


async def initial_profile_of(
    project_id: UUID,
    project_root: Path,
    stored_path: str,
    result: dict[str, Any],
    request: Any,
    selection: dict[str, Any],
    key: str,
) -> dict[str, Any]:
    """추천 후보 초기 종단(476 · `B05_Profile_Engine_InitialProfile` 머리) — [적용] 체인과 같은
    입력 · 같은 조각 · 지문 같으면 저장본 꺼냄. 실패 = `{error}`."""
    from dataclasses import asdict

    import aiomysql

    from B03_FileInput.B03_FileInput_Service_Chain import redesign_solve_request
    from B04_PreProcess.B04_PreProcess_Router_Watershed import STREAM_FILE, _prepare, _sheet_dir
    from B05_Profile import B05_Profile_Engine_InitialProfile as ip
    from B05_Profile import B05_Profile_Router_Replan as replan
    from B05_Profile.B05_Profile_Engine_Sections import _MODELS_SUBDIR
    from B05_Profile.B05_Profile_Repository import get_latest_route
    from B05_Profile.B05_Profile_Route_Save import section_seed
    from B05_Profile.B05_Profile_Router_RouteInitial import balanced_profile_of, project_standard
    from B06_Section.B06_Section_Repository import (
        get_latest_section_options,
        get_route_generation_source,
    )
    from B06_Section.B06_Section_Router_Regenerate_Options import (
        _regeneration_grade_options,
        _regeneration_options,
    )
    from common_util.common_util_surface_sampler import build_surface_sampler
    from common_util.common_util_workflow_state import get_workflow_state

    started = time.perf_counter()
    try:
        radius_m, _, _ = await replan._plan_criteria(project_id)  # [적용] 노선 짜기와 같은 R
        line, curves = ip.candidate_line(result["nodes"], result.get("curves") or [], radius_m)
        pool = get_db_pool()
        async with pool.acquire() as connection:
            latest = await get_latest_route(connection, project_id)
            source = (
                await get_route_generation_source(connection, project_id, int(latest["id"]))
                if latest
                else None
            )
            old_options = await get_latest_section_options(connection, project_id)
            async with connection.cursor(aiomysql.DictCursor) as cursor:
                state = await get_workflow_state(cursor, str(project_id))
        if not latest:
            return {"error": "저장된 노선이 없어 초기 종단을 셀 수 없습니다(자동설계 먼저)."}
        stage2 = next((s for s in state.get("stages", []) if int(s.get("stage_no", -1)) == 2), None)
        params = dict((stage2 or {}).get("params") or {})
        first, last = line[0], line[-1]
        # 체인 = 새 노선 점으로 stage 2 를 세움 — 측점 간격 · 계획선 기준엔 무관
        params["points"] = {
            "bp": {"x": first[0], "y": first[1]},
            "ep": {"x": last[0], "y": last[1]},
        }
        model_id = int(latest.get("surface_model_id") or 0)
        seed = section_seed(redesign_solve_request(params, selection, model_id), old_options)
        options = _regeneration_options(seed, params, float(seed["cross_half_width_m"]))
        grade_options = _regeneration_grade_options(params)
        epsg = (source or {}).get("crs_epsg")
        crs = f"EPSG:{epsg}" if epsg is not None else None
        surface = {k: selection.get(k) for k in ("source_filter", "method", "smooth")}
        models = project_root / _MODELS_SUBDIR
        route_path = str(latest.get("route_data_path") or "")
        mark = ip.fingerprint(
            {
                "key": key,
                "nodes": result["nodes"],
                "curves": result.get("curves"),
                "radius": radius_m,
                "surface": surface,
                "models": ip.stat_marks(list(models.glob(f"*_{surface['source_filter']}*.npz"))),
                "streams": ip.stat_marks([_sheet_dir(stored_path) / STREAM_FILE]),
                # 초기화(492) = 저장 관 · 구조물 · 추가 측점을 안 씀 — 노선 파일만
                "files": ip.file_marks([project_root / route_path]),
                "options": asdict(options),
                "grade": grade_options.as_dict() if grade_options else None,
                "crs": crs,
                "with_profile": request.with_profile,
                "criteria": request.criteria.model_dump() if request.criteria else None,
                "standard": await project_standard(project_id),
                "road": await replan._road_settings(project_id),
            }
        )
        stored = await asyncio.to_thread(ip.read_initial, project_root, key, mark)
        if stored is not None:
            return stored
        prepared = await _prepare(project_id)
        streams = [] if isinstance(prepared, JSONResponse) else prepared["streams"]
        facilities = await asyncio.to_thread(ip.reset_facilities, line, streams)
        target = None
        if request.with_profile:  # [적용] `balanced_target` 과 같은 셈(노선 정점 · 새 곡선표)
            points = [{"x": x, "y": y} for x, y in line]
            balanced = await balanced_profile_of(
                project_id, project_root, points, request.criteria, curves
            )
            target = None if balanced is None else (balanced["stations_m"], balanced["plan_m"])
        sampler = await asyncio.to_thread(
            build_surface_sampler,
            models,
            str(surface["source_filter"]),
            str(surface["method"] or "dtm"),
            bool(surface["smooth"]),
        )
        longitudinal = await asyncio.to_thread(
            functools.partial(
                ip.initial_longitudinal,
                project_root,
                line,
                curves,
                sampler,
                facilities,
                options=options,
                grade_options=grade_options,
                source_snapshot={
                    "filter": surface["source_filter"],
                    "method": surface["method"],
                    "smooth": bool(surface["smooth"]),
                },
                crs=crs,
                target=target,
            )
        )
        summary = {
            **ip.profile_summary(longitudinal),
            "with_profile": bool(request.with_profile),
            "seconds": round(time.perf_counter() - started, 2),
        }
        await asyncio.to_thread(ip.write_initial, project_root, key, mark, summary)
        logger.info(
            "추천 초기 종단 셈: project_id=%s %s 꼭짓점 %s 직선화 %s %.2fs",
            project_id,
            request.mode,
            summary.get("pvi_count"),
            summary.get("straightened"),
            summary["seconds"],
        )
        return summary
    except Exception as error:  # noqa: BLE001 — 추천은 그대로 · 화면이 이유 한 줄
        logger.exception("추천 초기 종단 셈 실패: project_id=%s", project_id)
        return {"error": f"초기 종단을 셈하지 못했습니다: {error}"}