"""Admin endpoints — debug + ручной запуск парсеров.

Auth: Caddy basic_auth gate'ит /trade-in/api/v1/admin/* — application layer открыт.
"""

from __future__ import annotations

import json
import logging
import time
from typing import Annotated, Literal

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

from app.core.config import settings
from app.core.db import SessionLocal, get_db
from app.schemas.trade_in import ScheduleConfig, ScheduleConfigUpdate
from app.services import cian_session as cian_session_svc
from app.services import scrape_runs as runs_mod
from app.services.geocoder import geocode
from app.services.scrape_pipeline import run_avito_city_sweep
from app.services.scrapers.avito import AvitoScraper
from app.services.scrapers.avito_detail import fetch_detail, save_detail_enrichment
from app.services.scrapers.avito_houses import fetch_house_catalog, save_house_catalog_enrichment
from app.services.scrapers.avito_imv import (
    IMVAddressNotFoundError,
    evaluate_via_imv,
    save_imv_evaluation,
    save_imv_placement_history,
)
from app.services.scrapers.base import save_listings
from app.services.scrapers.cian import CianScraper
from app.services.scrapers.n1 import N1Scraper
from app.services.scrapers.yandex_realty import YandexRealtyScraper

logger = logging.getLogger(__name__)

router = APIRouter()


_ALL_SOURCES = ["avito", "cian", "yandex", "n1"]


class ScrapeRequest(BaseModel):
    lat: float
    lon: float
    radius_m: int = Field(default=1000, ge=100, le=20000)
    sources: list[Literal["avito", "cian", "yandex", "n1"]] = Field(
        default_factory=lambda: list(_ALL_SOURCES)
    )
    # Если True — скрейп Yandex по 5 сегментам комнат, не одним общим запросом.
    multi_room_yandex: bool = False
    # Если True — Yandex полный обход 5 rooms × 3 sorts × 2 pages = 30 запросов / ~150s.
    deep_yandex: bool = False
    # Если True — скрейп Cian по 4 сегментам комнат отдельно (~4× лотов).
    multi_room_cian: bool = False
    # Если True — скрейп N1 по 4 сегментам комнат отдельно (~4× лотов).
    multi_room_n1: bool = False


class ScrapeResult(BaseModel):
    source: str
    fetched: int
    inserted: int
    updated: int


class ScrapeResponse(BaseModel):
    total_fetched: int
    total_inserted: int
    total_updated: int
    by_source: list[ScrapeResult]


@router.post("/scrape", response_model=ScrapeResponse)
async def scrape_around(
    payload: ScrapeRequest,
    db: Annotated[Session, Depends(get_db)],
) -> ScrapeResponse:
    """Запустить парсеры для точки (lat, lon) в радиусе radius_m метров.

    Примеры:
      curl -X POST /api/v1/admin/scrape \\
        -H 'Content-Type: application/json' \\
        -d '{"lat":56.8332,"lon":60.5944,"radius_m":1000,"sources":["avito"]}'
    """
    results: list[ScrapeResult] = []

    for source in payload.sources:
        scraper_cls = {
            "avito": AvitoScraper,
            "cian": CianScraper,
            "yandex": YandexRealtyScraper,
            "n1": N1Scraper,
        }.get(source)
        if scraper_cls is None:
            continue
        async with scraper_cls() as scraper:
            if source == "yandex" and payload.deep_yandex:
                lots = await scraper.fetch_around_multi_room(
                    payload.lat, payload.lon, payload.radius_m,
                    sorts=("DATE_DESC", "PRICE", "AREA_DESC"),
                    pages=(0, 1),
                )
            elif source == "yandex" and payload.multi_room_yandex:
                lots = await scraper.fetch_around_multi_room(
                    payload.lat, payload.lon, payload.radius_m
                )
            elif source == "cian" and payload.multi_room_cian:
                lots = await scraper.fetch_around_multi_room(
                    payload.lat, payload.lon, payload.radius_m
                )
            elif source == "n1" and payload.multi_room_n1:
                lots = await scraper.fetch_around_multi_room(
                    payload.lat, payload.lon, payload.radius_m
                )
            else:
                lots = await scraper.fetch_around(
                    payload.lat, payload.lon, payload.radius_m
                )
        inserted, updated = save_listings(db, lots)
        results.append(
            ScrapeResult(source=source, fetched=len(lots), inserted=inserted, updated=updated)
        )

    return ScrapeResponse(
        total_fetched=sum(r.fetched for r in results),
        total_inserted=sum(r.inserted for r in results),
        total_updated=sum(r.updated for r in results),
        by_source=results,
    )


def _clean_address_for_geocode(addr: str) -> str:
    """Чистим address для геокодера.

    Cian отдаёт «улица Латвийская, 56/3 · р-н Чкаловский» — суффикс ' · ...'
    мешает Nominatim. Берём часть до ' · '. N1 отдаёт «Репина, 75/2 стр.» — ок.
    """
    main = addr.split(" · ")[0].strip()
    return main or addr


@router.post("/geocode-missing")
async def geocode_missing(
    db: Annotated[Session, Depends(get_db)],
    limit: int = 100,
    target: Literal["listings", "deals"] = "listings",
) -> dict:
    """Геокодинг listings ИЛИ deals у которых нет lat/lon (используя address).

    target=listings (по умолч.) — объявления Cian/N1; target=deals — сделки Росреестра.
    Чанк-обработка с бюджетом по времени (~240с, заведомо меньше cron
    `curl -m 320`): за вызов геокодим сколько успеваем, остаток уходит в
    `remaining`, cron вызывает в цикле пока `remaining` > 0.

    geocode_tried_at: после КАЖДОЙ попытки (успех/провал) ставим NOW(). Failed-
    адреса не выбираются повторно 7 дней → cron-loop завершается, не зацикливается.
    geom обновляется автоматически триггером.
    """
    # Доп. фильтр для listings — у Avito/N1 встречаются плейсхолдер-адреса.
    extra_filter = (
        "AND address NOT LIKE '%(Avito)%' AND address NOT LIKE '%(N1)%'"
        if target == "listings"
        else ""
    )
    rows = db.execute(
        text(
            f"""
            SELECT id, address
            FROM {target}
            WHERE lat IS NULL
              AND COALESCE(address, '') != ''
              {extra_filter}
              AND (geocode_tried_at IS NULL
                   OR geocode_tried_at < NOW() - interval '7 days')
            ORDER BY geocode_tried_at NULLS FIRST
            LIMIT :limit
            """
        ),
        {"limit": limit},
    ).mappings().all()

    # Бюджет по времени: геокодинг упирается в Nominatim (1 req/sec + typo-тиры
    # на провалах), 100 адресов могут не уложиться в cron-таймаут `curl -m 320`.
    # Выходим из цикла заведомо раньше — remaining > 0 заставит cron продолжить.
    budget_sec = 240.0
    started = time.monotonic()

    geocoded = 0
    skipped = 0
    for row in rows:
        if time.monotonic() - started > budget_sec:
            logger.info(
                "geocode-missing: бюджет %.0fс исчерпан, обработано %d — cron продолжит",
                budget_sec, geocoded + skipped,
            )
            break
        clean = _clean_address_for_geocode(row["address"])
        result = await geocode(clean, db)
        if result is None:
            # Помечаем что пробовали — иначе ретрай на каждом cron.
            db.execute(
                text(f"UPDATE {target} SET geocode_tried_at = NOW() WHERE id = :id"),
                {"id": row["id"]},
            )
            db.commit()
            skipped += 1
            continue
        # geom пересчитается триггером из lat/lon.
        db.execute(
            text(
                f"UPDATE {target} SET lat = :lat, lon = :lon, "
                "geocode_tried_at = NOW() WHERE id = :id"
            ),
            {"lat": result.lat, "lon": result.lon, "id": row["id"]},
        )
        db.commit()
        geocoded += 1

    # Сколько ещё не-геокоженных адресов ждут (для cron-loop'а).
    remaining = db.execute(
        text(
            f"""
            SELECT count(*) FROM {target}
            WHERE lat IS NULL
              AND COALESCE(address, '') != ''
              {extra_filter}
              AND (geocode_tried_at IS NULL
                   OR geocode_tried_at < NOW() - interval '7 days')
            """
        )
    ).scalar()

    return {
        "checked": len(rows),
        "geocoded": geocoded,
        "skipped": skipped,
        "remaining": int(remaining or 0),
    }


@router.post("/scrape/cian/upload-cookies", status_code=200)
async def upload_cian_cookies(
    cookies: dict[str, str],
    db: Annotated[Session, Depends(get_db)],
) -> dict:
    """Upload Cian session cookies для аутентификации Valuation Calculator.

    Body: JSON object вида { "_ym_uid": "...", "_cian_visitor_session_id": "...", ... }
    Cookies экспортируются из Chrome DevTools → Application → Cookies → www.cian.ru
    или через расширение Cookie-Editor → Export → JSON (object format).

    Шаги:
      1. Фильтрует payload по CIAN_REQUIRED_COOKIES.
      2. Верифицирует через GET /kalkulator-nedvizhimosti/ — проверяет isAuthenticated.
      3. Сохраняет зашифрованно (pgp_sym_encrypt) в cian_session_cookies.

    Returns: {"ok": true, "userId": <int>, "cookieCount": <int>}
    """
    if not settings.cookie_encryption_key:
        raise HTTPException(status_code=503, detail="COOKIE_ENCRYPTION_KEY not configured")

    cleaned = {k: v for k, v in cookies.items() if k in cian_session_svc.CIAN_REQUIRED_COOKIES}
    if not cleaned:
        raise HTTPException(
            status_code=400,
            detail=(
                f"No recognized Cian cookies in payload. "
                f"Expected any of: {sorted(cian_session_svc.CIAN_REQUIRED_COOKIES)}"
            ),
        )

    state = await cian_session_svc.verify_session(cleaned)
    if state is None:
        raise HTTPException(
            status_code=401,
            detail="Cookies invalid or session not authenticated on cian.ru",
        )

    user_id = state.get("user", {}).get("userId")
    if not user_id:
        raise HTTPException(status_code=400, detail="Authenticated state missing userId")

    cian_session_svc.save_session(db, account_user_id=int(user_id), cookies=cleaned)
    return {"ok": True, "userId": user_id, "cookieCount": len(cleaned)}


@router.get("/scrape/cian/test-auth", status_code=200)
async def test_cian_auth(
    db: Annotated[Session, Depends(get_db)],
) -> dict:
    """Проверить что текущие сохранённые Cian cookies ещё валидны.

    Returns: {"authenticated": bool, "userId": <int|null>, "reason": <str|null>}
    """
    if not settings.cookie_encryption_key:
        return {"authenticated": False, "userId": None, "reason": "encryption_key_not_configured"}

    cookies = cian_session_svc.load_session(db)
    if cookies is None:
        return {"authenticated": False, "userId": None, "reason": "no_session_in_db"}

    state = await cian_session_svc.verify_session(cookies)
    if state is None:
        return {"authenticated": False, "userId": None, "reason": "session_expired_or_invalid"}

    user_id = state.get("user", {}).get("userId")
    return {"authenticated": True, "userId": user_id, "reason": None}


# ── Stage 4a: Avito enrichment endpoints (single-shot debug + manual triggers) ──


@router.post("/scrape/avito-house")
async def scrape_avito_house(
    db: Annotated[Session, Depends(get_db)],
    house_url: str,
) -> dict[str, object]:
    """Enrichment ОДНОГО дома Avito Houses Catalog.

    Body params (query): `house_url=/catalog/houses/<slug>/<id>` (absolute или relative path).

    Flow: fetch_house_catalog → save_house_catalog_enrichment.
    Returns counters {'house_id', 'reviews', 'sellers', 'listings_linked', 'placement_history'}.
    """
    try:
        enrichment = await fetch_house_catalog(house_url)
    except Exception as e:
        logger.exception("avito-house: fetch failed for %s", house_url)
        raise HTTPException(status_code=502, detail=f"fetch failed: {e}") from e

    try:
        counters = save_house_catalog_enrichment(db, enrichment)
    except Exception as e:
        logger.exception("avito-house: save failed for %s", house_url)
        raise HTTPException(status_code=500, detail=f"save failed: {e}") from e

    logger.info("avito-house ok: %s → %s", house_url, counters)
    return {"ok": True, "house_url": house_url, "counters": counters}


@router.post("/scrape/avito-detail")
async def scrape_avito_detail(
    db: Annotated[Session, Depends(get_db)],
    item_url: str,
) -> dict[str, object]:
    """Detail enrichment ОДНОГО listing.

    Body params (query): `item_url=/ekaterinburg/kvartiry/...` (absolute или relative).

    Flow: fetch_detail → save_detail_enrichment (UPDATE listings WHERE source='avito').
    Returns {'ok', 'item_id', 'updated'}.
    """
    try:
        enrichment = await fetch_detail(item_url)
    except Exception as e:
        logger.exception("avito-detail: fetch failed for %s", item_url)
        raise HTTPException(status_code=502, detail=f"fetch failed: {e}") from e

    try:
        updated = save_detail_enrichment(db, enrichment)
    except Exception as e:
        logger.exception("avito-detail: save failed for %s", item_url)
        raise HTTPException(status_code=500, detail=f"save failed: {e}") from e

    if not updated:
        # Listing с этим source_id ещё не существует в БД — был bypass через
        # /admin/scrape/avito-detail для несуществующего listing.
        logger.warning("avito-detail: no listing matched source_id=%s", enrichment.item_id)
    logger.info("avito-detail ok: %s item_id=%s updated=%s", item_url, enrichment.item_id, updated)
    return {"ok": True, "item_id": enrichment.item_id, "updated": updated}


@router.post("/scrape/avito-imv")
async def scrape_avito_imv(
    db: Annotated[Session, Depends(get_db)],
    address: str,
    rooms: int,
    area_m2: float,
    floor: int,
    floor_at_home: int,
    house_type: str,
    renovation_type: str,
    has_balcony: bool = False,
    has_loggia: bool = False,
) -> dict[str, object]:
    """Debug-trigger Avito IMV evaluation. БЕЗ cache — всегда свежий fetch.

    Production IMV вызывается из estimator (Stage 3, on-demand с 24h cache).
    Этот endpoint — для ручной отладки / data-pipeline tools.

    Returns {'ok', 'cache_key', 'recommended_price', 'range', 'market_count',
    'evaluation_id', 'history_saved'}.
    """
    try:
        result = await evaluate_via_imv(
            address=address,
            rooms=rooms,
            area_m2=area_m2,
            floor=floor,
            floor_at_home=floor_at_home,
            house_type=house_type,
            renovation_type=renovation_type,
            has_balcony=has_balcony,
            has_loggia=has_loggia,
        )
    except IMVAddressNotFoundError as e:
        raise HTTPException(status_code=404, detail=f"IMV address not found: {e}") from e
    except Exception as e:
        logger.exception("avito-imv: fetch failed for %s", address)
        raise HTTPException(status_code=502, detail=f"fetch failed: {e}") from e

    try:
        eval_id = save_imv_evaluation(db, result)
        history_saved = save_imv_placement_history(db, eval_id, result.placement_history)
    except Exception as e:
        logger.exception("avito-imv: save failed for %s", address)
        raise HTTPException(status_code=500, detail=f"save failed: {e}") from e

    logger.info(
        "avito-imv ok: addr=%s recommended=%d evaluation_id=%d history=%d",
        address[:60],
        result.recommended_price,
        eval_id,
        history_saved,
    )
    return {
        "ok": True,
        "cache_key": result.cache_key,
        "recommended_price": result.recommended_price,
        "range": [result.lower_price, result.higher_price],
        "market_count": result.market_count,
        "evaluation_id": eval_id,
        "history_saved": history_saved,
    }


# ── City sweep: background full-ЕКБ pipeline ────────────────────────────────


class CitySweepStartRequest(BaseModel):
    pages_per_anchor: int = Field(default=3, ge=1, le=10)
    detail_top_n: int = Field(default=20, ge=0, le=30)
    request_delay_sec: float = Field(default=7.0, ge=3.0, le=15.0)
    enrich_houses: bool = True
    radius_m: int = Field(default=1500, ge=500, le=5000)


class CitySweepStartResponse(BaseModel):
    run_id: int
    status: str
    pages_per_anchor: int
    detail_top_n: int


class ScrapeRunRow(BaseModel):
    run_id: int
    source: str
    status: str
    params: dict | None = None
    counters: dict | None = None
    error: str | None = None
    started_at: str | None = None
    finished_at: str | None = None
    heartbeat_at: str | None = None


@router.post("/scrape/avito-city-sweep", response_model=CitySweepStartResponse)
async def start_avito_city_sweep(
    payload: CitySweepStartRequest,
    background_tasks: BackgroundTasks,
    db: Annotated[Session, Depends(get_db)],
) -> CitySweepStartResponse:
    """Запустить full ЕКБ city sweep в background. Returns run_id для polling/cancel.

    Sweep итерирует 5 anchor-точек ЕКБ × pages_per_anchor страниц Avito,
    сохраняет listings, обогащает houses и detail. Runs in FastAPI BackgroundTasks.

    Coop cancel: POST /scrape/avito-city-sweep/{run_id}/cancel помечает run,
    pipeline проверяет статус каждый anchor.
    """
    run_id = runs_mod.create_run(db, source="avito_city_sweep", params=payload.model_dump())

    async def _sweep_task() -> None:
        sweep_db = SessionLocal()
        try:
            await run_avito_city_sweep(
                sweep_db,
                run_id=run_id,
                radius_m=payload.radius_m,
                pages_per_anchor=payload.pages_per_anchor,
                enrich_houses=payload.enrich_houses,
                detail_top_n=payload.detail_top_n,
                request_delay_sec=payload.request_delay_sec,
            )
        except Exception:
            logger.exception("city-sweep background task run_id=%d crashed", run_id)
        finally:
            sweep_db.close()

    background_tasks.add_task(_sweep_task)
    logger.info("city-sweep queued run_id=%d params=%s", run_id, payload.model_dump())
    return CitySweepStartResponse(
        run_id=run_id,
        status="running",
        pages_per_anchor=payload.pages_per_anchor,
        detail_top_n=payload.detail_top_n,
    )


@router.get("/scrape/avito-city-sweep/runs", response_model=list[ScrapeRunRow])
def list_avito_city_sweep_runs(
    db: Annotated[Session, Depends(get_db)],
    limit: int = 10,
) -> list[ScrapeRunRow]:
    """Список последних N runs (для UI polling). Default limit=10."""
    rows = runs_mod.list_recent(db, source="avito_city_sweep", limit=limit)
    return [
        ScrapeRunRow(
            run_id=r["run_id"],
            source=r["source"],
            status=r["status"],
            params=r.get("params"),
            counters=r.get("counters"),
            error=r.get("error"),
            started_at=r["started_at"].isoformat() if r.get("started_at") else None,
            finished_at=r["finished_at"].isoformat() if r.get("finished_at") else None,
            heartbeat_at=r["heartbeat_at"].isoformat() if r.get("heartbeat_at") else None,
        )
        for r in rows
    ]


@router.post("/scrape/avito-city-sweep/{run_id}/cancel")
def cancel_avito_city_sweep(
    run_id: int,
    db: Annotated[Session, Depends(get_db)],
) -> dict[str, object]:
    """Отменить running sweep. Cooperative: pipeline проверяет scrape_runs.status каждый anchor."""
    cancelled = runs_mod.mark_cancelled(db, run_id)
    return {"ok": True, "run_id": run_id, "cancelled": cancelled}


# ── In-app scheduler endpoints (Stage 4e) ────────────────────────────────────


@router.get("/scrape/schedules", response_model=list[ScheduleConfig])
def list_schedules(db: Annotated[Session, Depends(get_db)]) -> list[ScheduleConfig]:
    """Список всех schedules. Сейчас single row 'avito_city_sweep', extensible."""
    rows = db.execute(
        text(
            """
            SELECT id, source, enabled, window_start_hour, window_end_hour,
                   default_params, last_run_id, last_run_at, next_run_at,
                   created_at, updated_at
            FROM scrape_schedules
            ORDER BY source
            """
        ),
    ).mappings().all()
    return [
        ScheduleConfig(
            id=r["id"],
            source=r["source"],
            enabled=r["enabled"],
            window_start_hour=r["window_start_hour"],
            window_end_hour=r["window_end_hour"],
            default_params=r["default_params"] or {},
            last_run_id=r["last_run_id"],
            last_run_at=r["last_run_at"].isoformat() if r["last_run_at"] else None,
            next_run_at=r["next_run_at"].isoformat() if r["next_run_at"] else None,
            updated_at=r["updated_at"].isoformat() if r["updated_at"] else None,
        )
        for r in rows
    ]


@router.put("/scrape/schedules/{source}", response_model=ScheduleConfig)
def update_schedule(
    source: str,
    payload: ScheduleConfigUpdate,
    db: Annotated[Session, Depends(get_db)],
) -> ScheduleConfig:
    """UPDATE existing schedule (create если не существует, через INSERT ON CONFLICT)."""
    from app.services.scheduler import compute_next_run_at

    # Compute new next_run_at если window изменился — recompute, иначе keep existing
    next_at = compute_next_run_at(payload.window_start_hour, payload.window_end_hour)

    row = db.execute(
        text(
            """
            INSERT INTO scrape_schedules
                (source, enabled, window_start_hour, window_end_hour, default_params, next_run_at)
            VALUES (:source, :enabled, :ws, :we, CAST(:params AS jsonb), :next_at)
            ON CONFLICT (source) DO UPDATE SET
                enabled = EXCLUDED.enabled,
                window_start_hour = EXCLUDED.window_start_hour,
                window_end_hour = EXCLUDED.window_end_hour,
                default_params = EXCLUDED.default_params,
                next_run_at = EXCLUDED.next_run_at,
                updated_at = NOW()
            RETURNING id, source, enabled, window_start_hour, window_end_hour,
                      default_params, last_run_id, last_run_at, next_run_at, updated_at
            """
        ),
        {
            "source": source,
            "enabled": payload.enabled,
            "ws": payload.window_start_hour,
            "we": payload.window_end_hour,
            "params": json.dumps(payload.default_params, ensure_ascii=False),
            "next_at": next_at,
        },
    ).mappings().fetchone()
    db.commit()

    assert row is not None, f"scrape_schedules upsert returned no row for source={source!r}"
    return ScheduleConfig(
        id=row["id"],
        source=row["source"],
        enabled=row["enabled"],
        window_start_hour=row["window_start_hour"],
        window_end_hour=row["window_end_hour"],
        default_params=row["default_params"] or {},
        last_run_id=row["last_run_id"],
        last_run_at=row["last_run_at"].isoformat() if row["last_run_at"] else None,
        next_run_at=row["next_run_at"].isoformat() if row["next_run_at"] else None,
        updated_at=row["updated_at"].isoformat() if row["updated_at"] else None,
    )