"""B07 도면 조립 지원 — 원본 JSON·매니페스트 읽기/쓰기와 측점 대응표.

지원 모듈이 700줄을 넘어 떼어냈다(2026-09-04). 유역도 조각과 본체가 함께 쓴다.
"""

import json
import logging
import re
from pathlib import Path
from typing import Any

from B05_Profile.B05_Profile_Engine_Sections import prune_stale_cross_files

logger = logging.getLogger(__name__)


_STAGE_DIR = "B07_DesignDetail"

_CROSS_ID = re.compile(r"^cross_(\d+)m$")
_LONG_ID = re.compile(r"^longitudinal(?:_(\d+))?$")
# 노선 전장에 한 장씩만 나오는 도면 — 라우터가 원본 자료를 따로 실어 넘긴다.
MASS_HAUL_ID = "mass_haul"
WATERSHED_ID = "watershed"
COVER_ID = "cover"

# 아직 내용을 만들지 않은 도면 — 도각만 실어 연다(2026-09-01 사용자 지시).
# 화면 순서(DRAWING_GROUPS)와 같은 이름을 쓴다.
BLANK_DRAWINGS: tuple[tuple[str, str], ...] = (
    ("blank_plan_terrain", "계획평면도(지형)"),
    ("blank_plan_route", "계획평면도(노선배치도)"),
    ("blank_plan_layout", "계획평면도(배치도)"),
    ("blank_plan_lidar", "계획평면도(라이다)"),
    ("blank_cross_standard", "표준 횡단면도"),
    ("blank_standard", "표준도"),
    ("blank_landuse", "용지도"),
)
BLANK_LABELS: dict[str, str] = dict(BLANK_DRAWINGS)


def _read_json(path: Path) -> dict[str, Any]:
    payload = json.loads(path.read_text(encoding="utf-8"))
    if not isinstance(payload, dict):
        raise ValueError("도면 원본 JSON 형식이 올바르지 않습니다.")
    return payload


def _cross_files(longitudinal_path: Path, longitudinal: dict[str, Any]) -> list[Path]:
    cross_dir = longitudinal_path.parent.parent / "cross_sections"
    if not cross_dir.is_dir():
        raise FileNotFoundError("B06 횡단면 파일을 찾을 수 없습니다.")
    stations = longitudinal.get("stations")
    valid_names = prune_stale_cross_files(cross_dir, stations if isinstance(stations, list) else [])
    files = sorted(cross_dir.glob("cross_*.json"))
    if valid_names:
        files = [path for path in files if path.name in valid_names]
    return files


def _station_map(longitudinal: dict[str, Any]) -> dict[int, dict[str, Any]]:
    stations = longitudinal.get("stations", [])
    if not isinstance(stations, list):
        return {}
    return {
        round(float(station.get("chainage_m", 0))): station
        for station in stations
        if isinstance(station, dict)
    }


def _design_root(project_root: Path) -> Path:
    return project_root / _STAGE_DIR


def _read_manifest(project_root: Path) -> dict[str, Any]:
    path = _design_root(project_root) / "manifest.json"
    if not path.is_file():
        return {"drawings": {}}
    payload = _read_json(path)
    return payload if isinstance(payload.get("drawings"), dict) else {"drawings": {}}


def _write_manifest(project_root: Path, manifest: dict[str, Any]) -> None:
    stage_root = _design_root(project_root)
    stage_root.mkdir(parents=True, exist_ok=True)
    path = stage_root / "manifest.json"
    temporary = path.with_suffix(".tmp")
    temporary.write_text(json.dumps(manifest, ensure_ascii=False, indent=2), encoding="utf-8")
    temporary.replace(path)