"""공공데이터포털 전국문화축제표준데이터 클라이언트.

설정 키 이름은 기존 배포 계약을 유지하기 위해 TOUR_API_KEY를 그대로 사용한다.
"""

import hashlib
from datetime import date
from urllib.parse import unquote

import httpx

from config.server_configs import external_api_config

_URL = "https://api.data.go.kr/openapi/tn_pubr_public_cltur_fstvl_api"


class TourApiNotConfigured(RuntimeError):
    pass


class TourApiRequestFailed(RuntimeError):
    pass


def _normalize(item: dict) -> dict:
    """표준데이터 필드명을 화면/저장소의 공통 축제 필드로 변환한다."""
    identity = "|".join(str(item.get(key) or "") for key in ("fstvlNm", "fstvlStartDate", "fstvlEndDate", "insttCode"))
    return {
        "contentid": hashlib.sha256(identity.encode("utf-8")).hexdigest()[:32],
        "title": item.get("fstvlNm"),
        "eventstartdate": str(item.get("fstvlStartDate") or "").replace("-", ""),
        "eventenddate": str(item.get("fstvlEndDate") or "").replace("-", ""),
        "addr1": item.get("rdnmadr") or item.get("lnmadr") or item.get("eventPlace"),
        "mapx": item.get("longitude"),
        "mapy": item.get("latitude"),
        "tel": item.get("phoneNumber"),
        "homepage": item.get("homepageUrl"),
        "organizer": item.get("suprtInsttNm"),
        "overview": item.get("relateInfo") or item.get("opar"),
        "raw": item,
    }


async def search_festivals(*, start_date: date, area_code: str | None = None, rows: int = 100) -> list[dict]:
    key = (external_api_config.tour_api_key or "").strip()
    if not key:
        raise TourApiNotConfigured("TOUR_API_KEY is not configured")
    params = {
        # 포털의 "Encoding" 키를 넣어도 httpx가 이중 인코딩하지 않도록 원문으로 되돌린다.
        "serviceKey": unquote(key),
        "type": "json",
        "numOfRows": max(1, min(rows, 1000)),
        "pageNo": 1,
    }
    try:
        async with httpx.AsyncClient(timeout=httpx.Timeout(20.0, connect=5.0)) as client:
            response = await client.get(_URL, params=params)
            response.raise_for_status()
            payload = response.json()
        response_data = payload.get("response", payload)
        header = response_data.get("header", {})
        if header.get("resultCode") not in (None, "00", "0000"):
            raise TourApiRequestFailed(header.get("resultMsg") or "TourAPI returned an error")
        items_node = response_data.get("body", {}).get("items", [])
        items = items_node.get("item", []) if isinstance(items_node, dict) else items_node
        if isinstance(items, dict):
            items = [items]
        normalized = [_normalize(item) for item in (items or [])]
        # API가 날짜 필터를 제공하지 않으므로 종료된 축제는 애플리케이션에서 제외한다.
        cutoff = start_date.strftime("%Y%m%d")
        return [item for item in normalized if not item["eventenddate"] or item["eventenddate"] >= cutoff]
    except (httpx.HTTPError, ValueError, TypeError) as ex:
        raise TourApiRequestFailed(str(ex)) from ex