"""B07 [초기화](요구 298-2 · 300 C1 · C3) — 그 페이지 사용자 값 · 설정을 지움.

    POST /api/projects/{id}/design-drawings/reset   본문 없음

기준 = 저장본 없이 지금 B06 정본으로 그린 원본(떠 두지 않음 · 앞 단계 저장 = 저절로 새 기준).
지움 = 모든 저장본 확정 풂(`confirmed=False` · 도면번호 · json 남김 = [원본에서 다시 그리기] 꼴) ·
B07 이 확정으로 올린 측점 설계 → 잠정 · 설정 파일(축척 · 횡단 배치 · 표 배율 · 평면도 종류 · 표식).
M02 층(도각 · 표지)은 안 건드림. 단계 = [저장]과 같음(`mark_stage` save).
"""

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

from fastapi import APIRouter
from fastapi.responses import JSONResponse

from B06_Section.B06_Section_Repository import merge_cross_section_design_by_round
from B07_DesignDetail.B07_DesignDetail_Engine_Template import drawing_scales_path
from B07_DesignDetail.B07_DesignDetail_Router import _confirmed_source, _designs_by_chainage
from B07_DesignDetail.B07_DesignDetail_Router_Support import CROSS_LAYOUT_FILE
from B07_DesignDetail.B07_DesignDetail_Router_Support_Io import (
    _design_root,
    _read_manifest,
    _write_manifest,
)
from B07_DesignDetail.B07_DesignDetail_Router_Support_Plan import _kinds_dir, _marks_path
from common_util.common_util_workflow_state import mark_stage
from config.config_db import get_db_pool

logger = logging.getLogger(__name__)
router = APIRouter(prefix="/api/projects", tags=["B07 Design Detail"])


def reset_design_files(project_root: Path) -> dict[str, Any]:
    """저장본 풂 + 설정 파일 지움 → {released: 풀린 장 수, cleared: 지운 설정 이름}."""
    manifest = _read_manifest(project_root)
    released = 0
    for entry in manifest["drawings"].values():
        if entry.get("confirmed"):
            entry["confirmed"] = False
            released += 1
    if released:
        _write_manifest(project_root, manifest)
    cleared = []
    for path in (
        drawing_scales_path(project_root),
        _design_root(project_root) / CROSS_LAYOUT_FILE,
        _marks_path(project_root),
    ):
        if path.is_file():
            path.unlink()
            cleared.append(path.name)
    if _kinds_dir(project_root).is_dir():
        shutil.rmtree(_kinds_dir(project_root))
        cleared.append(_kinds_dir(project_root).name)
    return {"released": released, "cleared": cleared}


@router.post("/{project_id}/design-drawings/reset")
async def reset_design_drawings(project_id: UUID) -> Any:
    try:
        route_id, project_root, _longitudinal_path, _bypass = await _confirmed_source(project_id)
        result = await asyncio.to_thread(reset_design_files, project_root)
        designs = await _designs_by_chainage(route_id)
        confirmed = [chainage for chainage, d in designs.items() if d.get("status") == "confirmed"]
        pool = get_db_pool()
        async with pool.acquire() as connection:
            await connection.begin()
            try:
                for chainage in confirmed:
                    await merge_cross_section_design_by_round(
                        connection,
                        route_id=route_id,
                        chainage=chainage,
                        patch={"status": "provisional"},
                    )
                async with connection.cursor() as cursor:
                    await mark_stage(str(project_id), 4, "save", cursor)
                await connection.commit()
            except Exception:
                await connection.rollback()
                raise
        return {
            "status": "success",
            "project_id": str(project_id),
            **result,
            "provisional": len(confirmed),
        }
    except FileNotFoundError as exc:
        return JSONResponse(status_code=404, content={"status": "error", "message": str(exc)})
    except PermissionError as exc:
        return JSONResponse(status_code=409, content={"status": "error", "message": str(exc)})
    except Exception:
        logger.exception("B07 초기화 실패: project_id=%s", project_id)
        return JSONResponse(
            status_code=500,
            content={"status": "error", "message": "상세 설계를 초기화하지 못했습니다."},
        )