"""한국관광공사 TourAPI(KorService2) — **업장 반경** 주변정보 수집 클라이언트."""
from datetime import date
from typing import Optional
from urllib.parse import unquote, urlencode

import httpx

from common.enums import LocalContentType
from common.utils.geo import haversine_m
from config.server_configs import external_api_config

BASE_URL = "https://apis.data.go.kr/B551011/KorService2"
REQUEST_TIMEOUT = 25
PAGE_SIZE = 100
MAX_PAGES = 4

# TourAPI contentTypeId ↔ 우리 종류 코드(locationBasedList2 용).
CONTENT_TYPE_MAP = {
    "39": LocalContentType.RESTAURANT.value,
    "12": LocalContentType.ATTRACTION.value,
}

# 상업적 이용이 허용된 공공누리 유형(tour_api_adapter 와 동일 규칙·동일 이유).
_COMMERCIAL_OK_LICENSES = frozenset({"type1", "type3"})


class TourApiNotConfigured(RuntimeError):
    pass


class TourApiRequestFailed(RuntimeError):
    pass


# ── HTTP ───────────────────────────────────────────────────────────────


def _service_key() -> str:
    key = (external_api_config.tour_api_key or "").strip()
    if not key:
        raise TourApiNotConfigured("TOUR_API_KEY is not configured")
    return key


async def _call(client: httpx.AsyncClient, op: str, **params) -> tuple[list[dict], int]:
    """오퍼레이션 1회 → (항목, totalCount)."""
    query = urlencode(
        {"serviceKey": unquote(_service_key()), "MobileOS": "ETC", "MobileApp": "o2o-web4ai",
         "_type": "json", "numOfRows": str(PAGE_SIZE), "pageNo": "1", **params},
        safe="",
    )
    res = await client.get(f"{BASE_URL}/{op}?{query}")
    if res.status_code != 200:
        raise TourApiRequestFailed(f"{op} HTTP {res.status_code}")
    try:
        payload = res.json()
    except ValueError:
        # 인증 실패·쿼터 초과는 XML 로 온다.
        raise TourApiRequestFailed(f"{op} 응답이 JSON 이 아니다: {res.text[:160]}")

    # 게이트웨이 오류(미등록 키 등)는 200 + JSON 이지만 response 가 없다.
    if "response" not in payload:
        raise TourApiRequestFailed(f"{op} 게이트웨이 오류: {str(payload)[:160]}")
    header = payload["response"].get("header", {})
    code = str(header.get("resultCode") or "")
    if code not in ("0000", "00"):
        raise TourApiRequestFailed(f"{op} 실패 [{code}] {header.get('resultMsg')}")

    body = payload["response"].get("body", {}) or {}
    items = (body.get("items") or {}).get("item") if isinstance(body.get("items"), dict) else None
    if isinstance(items, dict):
        items = [items]
    total = int(body.get("totalCount") or 0)
    return items or [], total


# ── 정규화 ──────────────────────────────────────────────────────────────

def _int(value) -> Optional[int]:
    try:
        return int(float(str(value).strip()))
    except (TypeError, ValueError):
        return None


def _normalize(item: dict) -> Optional[dict]:
    """locationBasedList2 항목 1건 → 정규화 dict."""
    content_id = str(item.get("contentid") or "").strip()
    title = str(item.get("title") or "").strip()
    kind = CONTENT_TYPE_MAP.get(str(item.get("contenttypeid") or "").strip())
    distance = _int(item.get("dist"))
    if not content_id or not title or kind is None or distance is None:
        return None

    out = {
        "contentid": content_id, "content_type": kind, "distance_m": distance,
        # 렌더러 계약(LocalPlace).
        "name": title, "searchQuery": title,
    }
    address = str(item.get("addr1") or "").strip()
    if address:
        out["location"] = address
    # 좌표는 컬럼으로 간다.
    for src, dst in (("mapx", "longitude"), ("mapy", "latitude")):
        value = str(item.get(src) or "").strip()
        if value:
            out[dst] = value
    # 중분류만 남긴다.
    cls = str(item.get("lclsSystm2") or "").strip()
    if cls:
        out["lclsSystm2"] = cls

    # 사진은 상업적 이용이 허용된 공공누리 유형일 때만 싣는다.
    image = str(item.get("firstimage") or "").strip()
    license_code = str(item.get("cpyrhtDivCd") or "").strip().lower()
    if image and license_code in _COMMERCIAL_OK_LICENSES:
        out["imageUrl"] = image
    return out


# ── 공개 API ────────────────────────────────────────────────────────────

def make_client() -> httpx.AsyncClient:
    return httpx.AsyncClient(timeout=REQUEST_TIMEOUT)


async def find_image(client: httpx.AsyncClient, keyword: str, region_token: str) -> Optional[str]:
    """이름으로 공공데이터 사진 한 장."""
    word = (keyword or "").strip()
    token = (region_token or "").strip()
    if not word:
        return None
    try:
        items, _ = await _call(client, "searchKeyword2", keyword=word, arrange="O")
    except Exception:  # noqa: BLE001 — 사진은 있으면 좋은 것이지 없으면 안 되는 것이 아니다
        return None

    for item in items:
        image = str(item.get("firstimage") or "").strip()
        if not image:
            continue
        if str(item.get("cpyrhtDivCd") or "").strip().lower() not in _COMMERCIAL_OK_LICENSES:
            continue
        addr = f"{item.get('addr1') or ''} {item.get('addr2') or ''}"
        if token and token not in addr:
            continue
        return image
    return None


async def fetch_nearby(client: httpx.AsyncClient, latitude: float, longitude: float,
                       *, radius_m: int, content_type_id: str) -> list[dict]:
    """업장 좌표 반경 안의 한 종류(정규화, 거리순)."""
    out: list[dict] = []
    seen: set[str] = set()
    for page in range(1, MAX_PAGES + 1):
        items, total = await _call(
            client, "locationBasedList2",
            mapX=str(longitude), mapY=str(latitude), radius=str(radius_m),
            contentTypeId=content_type_id, arrange="E", pageNo=str(page),
        )
        for item in items:
            body = _normalize(item)
            if body and body["contentid"] not in seen:
                seen.add(body["contentid"])
                out.append(body)
        if not items or page * PAGE_SIZE >= total:
            break
    out.sort(key=lambda b: b["distance_m"])
    return out


def _normalize_festival(item: dict, distance_m: int) -> Optional[dict]:
    """searchFestival2 항목 1건 → 정규화 dict."""
    content_id = str(item.get("contentid") or "").strip()
    title = str(item.get("title") or "").strip()
    if not content_id or not title:
        return None

    out = {
        "contentid": content_id, "content_type": LocalContentType.FESTIVAL.value,
        "distance_m": distance_m, "name": title, "searchQuery": title,
    }
    address = str(item.get("addr1") or "").strip()
    if address:
        out["location"] = address
    for src, dst in (("mapx", "longitude"), ("mapy", "latitude")):
        value = str(item.get(src) or "").strip()
        if value:
            out[dst] = value
    for key in ("eventstartdate", "eventenddate", "homepage", "overview", "lclsSystm2"):
        value = str(item.get(key) or "").strip()
        if value:
            out[key] = value

    image = str(item.get("firstimage") or "").strip()
    license_code = str(item.get("cpyrhtDivCd") or "").strip().lower()
    if image and license_code in _COMMERCIAL_OK_LICENSES:
        out["imageUrl"] = image
    return out


async def fetch_festivals_in_sido(client: httpx.AsyncClient, latitude: float, longitude: float,
                                  *, sido_code: str, today: date) -> list[dict]:
    """업장이 속한 시도의 축제 **전부**(정규화, 거리순, 종료 여부와 무관하게 전부)."""
    start_date = date(today.year, 1, 1).strftime("%Y%m%d")
    out: list[dict] = []
    seen: set[str] = set()
    for page in range(1, MAX_PAGES + 1):
        items, total = await _call(
            client, "searchFestival2",
            eventStartDate=start_date, lDongRegnCd=sido_code, pageNo=str(page),
        )
        for item in items:
            lnglat = _mapxy(item)  # (경도, 위도) — 좌표가 없으면 거리를 잴 수 없다
            if lnglat is None:
                continue
            lng, lat = lnglat
            distance = haversine_m(latitude, longitude, lat, lng)  # 자르지 않는다 — 정렬·표시용
            body = _normalize_festival(item, round(distance))
            if not body or body["contentid"] in seen:
                continue
            seen.add(body["contentid"])
            out.append(body)
        if not items or page * PAGE_SIZE >= total:
            break
    out.sort(key=lambda b: b["distance_m"])
    return out


def _mapxy(item: dict) -> Optional[tuple[float, float]]:
    """(경도, 위도)."""
    try:
        return float(item.get("mapx")), float(item.get("mapy"))
    except (TypeError, ValueError):
        return None


async def fetch_content_class(client: httpx.AsyncClient, content_id: str) -> Optional[str]:
    """콘텐츠 1건의 중분류 코드(lclsSystm2)."""
    items, _ = await _call(client, "detailCommon2", contentId=content_id)
    if not items:
        return None
    code = str(items[0].get("lclsSystm2") or "").strip()
    return code or None