"""Cadastral lookup endpoints — reverse geocode via cad_buildings.

Used by trade-in backend (and potentially other internal services) to resolve
координаты → адрес жилого дома без зависимости от внешних геокодеров.
"""

from __future__ import annotations

import logging
from typing import Annotated

from fastapi import APIRouter, Depends, HTTPException, Query
from pydantic import BaseModel
from sqlalchemy import text
from sqlalchemy.orm import Session

from app.core.db import get_db

logger = logging.getLogger(__name__)

router = APIRouter()


class CadastralReverseResult(BaseModel):
    address: str
    lat: float
    lon: float
    distance_m: float
    cad_num: str | None = None


@router.get("/reverse", response_model=CadastralReverseResult)
async def reverse(
    lat: Annotated[float, Query(ge=-90, le=90)],
    lon: Annotated[float, Query(ge=-180, le=180)],
    radius_m: Annotated[int, Query(ge=10, le=2000)] = 200,
    db: Annotated[Session, Depends(get_db)] = None,  # type: ignore[assignment]
) -> CadastralReverseResult:
    """Координаты → ближайшее здание из cad_buildings.

    Filters out гаражи/СНТ/садовод/товарищества — для trade-in нужны жилые дома.

    Returns 404 если в радиусе нет подходящего здания.
    """
    row = db.execute(
        text(
            """
            SELECT
                readable_address,
                cad_num,
                ST_Y(ST_Centroid(geom)) AS lat,
                ST_X(ST_Centroid(geom)) AS lon,
                ST_Distance(
                    geom::geography,
                    ST_SetSRID(
                        ST_MakePoint(
                            CAST(:lon AS double precision),
                            CAST(:lat AS double precision)
                        ),
                        4326
                    )::geography
                ) AS distance_m
            FROM cad_buildings
            WHERE ST_DWithin(
                geom::geography,
                ST_SetSRID(
                    ST_MakePoint(
                        CAST(:lon AS double precision),
                        CAST(:lat AS double precision)
                    ),
                    4326
                )::geography,
                CAST(:radius AS double precision)
            )
            AND readable_address !~* '(гараж|снт|садовод|товарищ|уч\\.)'
            ORDER BY ST_Distance(
                geom::geography,
                ST_SetSRID(
                    ST_MakePoint(
                        CAST(:lon AS double precision),
                        CAST(:lat AS double precision)
                    ),
                    4326
                )::geography
            )
            LIMIT 1
            """
        ),
        {"lat": lat, "lon": lon, "radius": float(radius_m)},
    ).first()

    if row is None:
        raise HTTPException(status_code=404, detail="no cadastral building found within radius")

    return CadastralReverseResult(
        address=row.readable_address,
        lat=float(row.lat),
        lon=float(row.lon),
        distance_m=round(float(row.distance_m), 1),
        cad_num=row.cad_num,
    )