feat(site-finder): /parcels/{cad}/isochrones via OpenRouteService

backend/app/api/v1/parcels.py

@@ -4,10 +4,11 @@ import math
 from typing import Annotated, Any
 
 import httpx
-from fastapi import APIRouter, Depends, HTTPException
+from fastapi import APIRouter, Depends, HTTPException, Query
 from sqlalchemy import text
 from sqlalchemy.orm import Session
 
+from app.core.config import settings
 from app.core.db import get_db
 from app.schemas.parcel import ParcelDetail, ParcelSearchRequest, ParcelSearchResponse
 
@@ -805,4 +806,124 @@ def analyze_parcel(
         "utilities": utilities,
         "geotech_risk": _geotech_risk(66, db, geom_wkt),
         "market_trend": market_trend,
+        "isochrones_available": bool(settings.openrouteservice_api_key),
+    }
+
+
+_ORS_BASE = "https://api.openrouteservice.org/v2/isochrones"
+_ORS_VALID_MODES = frozenset({"foot-walking", "cycling-regular", "driving-car"})
+
+
+@router.get("/{cad_num}/isochrones")
+def get_isochrones(
+    cad_num: str,
+    db: Annotated[Session, Depends(get_db)],
+    mode: str = "foot-walking",
+    times_min: Annotated[list[int], Query()] = [10, 15],  # noqa: B006
+) -> dict[str, Any]:
+    """Изохроны доступности от центроида участка через OpenRouteService.
+
+    Modes: foot-walking | cycling-regular | driving-car.
+    times_min — список минут (1-60), например ?times_min=10&times_min=15.
+    Возвращает GeoJSON FeatureCollection для рендера на карте.
+    """
+    if not settings.openrouteservice_api_key:
+        raise HTTPException(
+            status_code=503,
+            detail=(
+                "OPENROUTESERVICE_API_KEY не задан в env. "
+                "Получи free key на https://openrouteservice.org/dev/#/signup "
+                "и пропиши в backend/.env.runtime"
+            ),
+        )
+
+    if mode not in _ORS_VALID_MODES:
+        raise HTTPException(
+            status_code=422,
+            detail=f"Недопустимый mode '{mode}'. Допустимые: {sorted(_ORS_VALID_MODES)}",
+        )
+
+    invalid_times = [t for t in times_min if not (1 <= t <= 60)]
+    if invalid_times:
+        raise HTTPException(
+            status_code=422,
+            detail=f"times_min значения вне диапазона 1-60: {invalid_times}",
+        )
+
+    # Получить координаты центроида из доступных геометрий участка
+    coord_row = (
+        db.execute(
+            text("""
+            SELECT ST_X(ST_Centroid(g.geom)) AS lon,
+                   ST_Y(ST_Centroid(g.geom)) AS lat
+              FROM (
+                SELECT geom FROM cad_quarters_geom WHERE cad_number = :c
+                UNION ALL
+                SELECT geom FROM cad_buildings WHERE cad_num = :c
+                UNION ALL
+                SELECT geom FROM cad_parcels_geom WHERE cad_num = :c
+              ) g
+             LIMIT 1
+        """),
+            {"c": cad_num},
+        )
+        .mappings()
+        .first()
+    )
+
+    if not coord_row:
+        raise HTTPException(
+            status_code=404,
+            detail=f"Геометрия для {cad_num} не найдена.",
+        )
+
+    lat = float(coord_row["lat"])
+    lon = float(coord_row["lon"])
+
+    # OpenRouteService isochrones API — POST с JSON body
+    url = f"{_ORS_BASE}/{mode}"
+    body: dict[str, Any] = {
+        "locations": [[lon, lat]],
+        "range": [t * 60 for t in times_min],  # ORS ожидает секунды
+        "range_type": "time",
+        "units": "m",
+    }
+    headers = {
+        "Authorization": settings.openrouteservice_api_key,
+        "Content-Type": "application/json",
+        "Accept": "application/geo+json",
+    }
+
+    try:
+        with httpx.Client(timeout=10) as client:
+            resp = client.post(url, json=body, headers=headers)
+            resp.raise_for_status()
+            geojson = resp.json()
+    except httpx.HTTPStatusError as exc:
+        if exc.response.status_code == 429:
+            raise HTTPException(
+                status_code=429,
+                detail="OpenRouteService daily limit (2000 req) exceeded.",
+            ) from exc
+        logger.error("ORS HTTP error for %s: %s — %s", cad_num, exc.response.status_code, exc)
+        raise HTTPException(
+            status_code=500,
+            detail=f"ORS error {exc.response.status_code}: {exc.response.text[:200]}",
+        ) from exc
+    except Exception as exc:
+        logger.error("ORS request failed for %s: %s", cad_num, exc)
+        raise HTTPException(
+            status_code=500,
+            detail=f"Isochrones fetch failed: {exc}",
+        ) from exc
+
+    return {
+        "cad_num": cad_num,
+        "lat": lat,
+        "lon": lon,
+        "mode": mode,
+        "times_min": times_min,
+        "geojson": geojson,
+        "source": "openrouteservice.org",
+        "note": "Free tier 2000 req/day. Замена на self-hosted OSRM — в #27.",
     }

backend/app/core/config.py

@@ -92,5 +92,10 @@ class Settings(BaseSettings):
     #   OBJECTIVE_ANTON_SQLITE_PATH=C:/Users/user/source/repos/gendesign/sf_anton_snapshot.db
     objective_anton_sqlite_path: str = "/data/anton-sqlite/analysis.db"
 
+    # OpenRouteService API (https://openrouteservice.org/dev/#/signup).
+    # Free tier: 2000 запросов/день. Используется в /parcels/{cad}/isochrones.
+    # Если не задан — endpoint вернёт 503 с инструкцией по регистрации.
+    openrouteservice_api_key: str = ""
+
 
 settings = Settings()