import logging
import time
import concurrent.futures
from urllib.parse import quote
import requests as _requests
from cachetools import TTLCache
from services.network_utils import fetch_with_curl, outbound_user_agent

logger = logging.getLogger(__name__)

# Cache dossier results for 24 hours — country data barely changes
# Key: rounded lat/lng grid (0.1 degree ≈ 11km)
dossier_cache = TTLCache(maxsize=500, ttl=86400)

# Nominatim requires max 1 req/sec — track last call time
_nominatim_last_call = 0.0

# Issues #218 / #219 (tg12): Wikimedia's User-Agent policy requires API
# clients to identify themselves with a stable User-Agent that includes
# a contact path.
#
# Round 7a: the original fix in PR #284 used a single project-wide
# identifier, which from Wikimedia's perspective made every Shadowbroker
# install in the world look like one giant scraper. If one install
# misbehaved, their only recourse was to block "Shadowbroker" as a
# whole. We now build the headers from ``outbound_user_agent('wikimedia')``
# which embeds the per-install operator handle (auto-generated or
# operator-chosen), so Wikimedia can rate-limit / contact the specific
# install instead of the project.


def _wikimedia_request_headers() -> dict[str, str]:
    ua = outbound_user_agent("wikimedia")
    return {
        "User-Agent": ua,
        # Browser-JS-style header that Wikimedia's policy explicitly
        # accepts on top of (or instead of) User-Agent. We send both so
        # whichever the upstream prefers, the per-operator handle is
        # always available.
        "Api-User-Agent": ua,
    }


def _reverse_geocode_offline(lat: float, lng: float) -> dict:
    """Offline fallback via reverse_geocoder when external reverse geocoding is blocked."""
    try:
        import reverse_geocoder as rg

        hit = rg.search((lat, lng), mode=1)[0]
        country_code = (hit.get("cc") or "").upper()
        city = hit.get("name") or ""
        state = hit.get("admin1") or ""
        display = ", ".join(part for part in [city, state, country_code] if part)
        return {
            "city": city,
            "state": state,
            "country": country_code or "Unknown",
            "country_code": country_code,
            "display_name": display,
            "offline_fallback": True,
        }
    except Exception as e:
        logger.warning(f"Offline reverse geocode failed: {e}")
        return {}


def _reverse_geocode(lat: float, lng: float) -> dict:
    global _nominatim_last_call
    url = (
        f"https://nominatim.openstreetmap.org/reverse?"
        f"lat={lat}&lon={lng}&format=json&zoom=10&addressdetails=1&accept-language=en"
    )
    headers = {"User-Agent": outbound_user_agent("nominatim")}

    for attempt in range(2):
        # Enforce Nominatim's 1 req/sec policy
        elapsed = time.time() - _nominatim_last_call
        if elapsed < 1.1:
            time.sleep(1.1 - elapsed)
        _nominatim_last_call = time.time()

        try:
            # Use requests directly — fetch_with_curl raises on non-200 which breaks 429 handling
            res = _requests.get(url, timeout=4, headers=headers)
            if res.status_code == 200:
                data = res.json()
                addr = data.get("address", {})
                return {
                    "city": addr.get("city")
                    or addr.get("town")
                    or addr.get("village")
                    or addr.get("county")
                    or "",
                    "state": addr.get("state") or addr.get("region") or "",
                    "country": addr.get("country") or "",
                    "country_code": (addr.get("country_code") or "").upper(),
                    "display_name": data.get("display_name", ""),
                }
            elif res.status_code == 429:
                logger.warning(
                    f"Nominatim 429 rate-limited, retrying after 1s (attempt {attempt+1})"
                )
                time.sleep(1)
                continue
            else:
                logger.warning(f"Nominatim returned {res.status_code}")
        except (_requests.RequestException, ConnectionError, TimeoutError, OSError) as e:
            logger.warning(f"Reverse geocode failed: {e}")
    return _reverse_geocode_offline(lat, lng)


def _fetch_country_data(country_code: str) -> dict:
    if not country_code:
        return {}
    url = (
        f"https://restcountries.com/v3.1/alpha/{country_code}"
        f"?fields=name,population,capital,languages,region,subregion,area,currencies,borders,flag"
    )
    try:
        res = fetch_with_curl(url, timeout=5)
        if res.status_code == 200:
            data = res.json()
            if isinstance(data, list):
                return data[0] if data and isinstance(data[0], dict) else {}
            return data if isinstance(data, dict) else {}
    except (ConnectionError, TimeoutError, ValueError, KeyError, OSError) as e:
        logger.warning(f"RestCountries failed for {country_code}: {e}")
    return {}


def _fetch_wikidata_leader(country_name: str) -> dict:
    if not country_name:
        return {"leader": "Unknown", "government_type": "Unknown"}
    # SPARQL: get head of state (P35) and form of government (P122) for a sovereign state
    safe_name = country_name.replace('"', '\\"').replace("'", "\\'")
    sparql = f"""
    SELECT ?leaderLabel ?govTypeLabel WHERE {{
      ?country wdt:P31 wd:Q6256 ;
               rdfs:label "{safe_name}"@en .
      OPTIONAL {{ ?country wdt:P35 ?leader . }}
      OPTIONAL {{ ?country wdt:P122 ?govType . }}
      SERVICE wikibase:label {{ bd:serviceParam wikibase:language "en". }}
    }} LIMIT 1
    """
    url = f"https://query.wikidata.org/sparql?query={quote(sparql)}&format=json"
    try:
        # Issue #218 (tg12): Wikimedia's User-Agent policy requires
        # outbound API traffic to be identifiable. fetch_with_curl()
        # sends the project default, and we also add the Wikimedia-
        # specific Api-User-Agent that the policy specifically asks
        # for, since this request originates from a backend service
        # that proxies on behalf of (potentially many) browser users.
        res = fetch_with_curl(url, timeout=6, headers=_wikimedia_request_headers())
        if res.status_code == 200:
            results = res.json().get("results", {}).get("bindings", [])
            if results:
                r = results[0]
                return {
                    "leader": r.get("leaderLabel", {}).get("value", "Unknown"),
                    "government_type": r.get("govTypeLabel", {}).get("value", "Unknown"),
                }
    except (ConnectionError, TimeoutError, ValueError, KeyError, OSError) as e:
        logger.warning(f"Wikidata SPARQL failed for {country_name}: {e}")
    return {"leader": "Unknown", "government_type": "Unknown"}


def _fetch_local_wiki_summary(place_name: str, country_name: str = "") -> dict:
    if not place_name:
        return {}
    # Try exact match first, then with country qualifier
    candidates = [place_name]
    if country_name:
        candidates.append(f"{place_name}, {country_name}")

    for name in candidates:
        slug = quote(name.replace(" ", "_"))
        url = f"https://en.wikipedia.org/api/rest_v1/page/summary/{slug}"
        try:
            # Issue #219 (tg12): identify ourselves to Wikimedia per
            # their UA policy; see _fetch_wikidata_leader above.
            res = fetch_with_curl(url, timeout=5, headers=_wikimedia_request_headers())
            if res.status_code == 200:
                data = res.json()
                if data.get("type") != "disambiguation":
                    return {
                        "description": data.get("description", ""),
                        "extract": data.get("extract", ""),
                        "thumbnail": data.get("thumbnail", {}).get("source", ""),
                    }
        except (
            ConnectionError,
            TimeoutError,
            ValueError,
            KeyError,
            OSError,
        ):  # Intentional: optional enrichment
            continue
    return {}


def get_region_dossier(lat: float, lng: float) -> dict:
    cache_key = f"{round(lat, 1)}_{round(lng, 1)}"
    if cache_key in dossier_cache:
        return dossier_cache[cache_key]

    # Step 1: Reverse geocode
    geo = _reverse_geocode(lat, lng)
    if not geo or not geo.get("country"):
        return {
            "coordinates": {"lat": lat, "lng": lng},
            "location": geo or {},
            "country": None,
            "local": None,
            "error": "No country data — possibly international waters or uninhabited area",
        }

    country_code = geo.get("country_code", "")
    country_name = geo.get("country", "")
    city_name = geo.get("city", "")
    state_name = geo.get("state", "")

    # Step 2: Parallel fetch with real timeouts that do not block on executor shutdown
    pool = concurrent.futures.ThreadPoolExecutor(max_workers=4)
    try:
        country_fut = pool.submit(_fetch_country_data, country_code)
        leader_fut = pool.submit(_fetch_wikidata_leader, country_name)
        local_fut = pool.submit(
            _fetch_local_wiki_summary, city_name or state_name, country_name
        )
        country_wiki_fut = pool.submit(_fetch_local_wiki_summary, country_name, "")

        try:
            country_data = country_fut.result(timeout=6)
        except Exception:  # Intentional: optional enrichment
            logger.warning("Country data fetch timed out or failed")
            country_data = {}
        try:
            leader_data = leader_fut.result(timeout=6)
        except Exception:  # Intentional: optional enrichment
            logger.warning("Leader data fetch timed out or failed")
            leader_data = {"leader": "Unknown", "government_type": "Unknown"}
        try:
            local_data = local_fut.result(timeout=5)
        except Exception:  # Intentional: optional enrichment
            logger.warning("Local wiki fetch timed out or failed")
            local_data = {}
        try:
            country_wiki_data = country_wiki_fut.result(timeout=5)
        except Exception:  # Intentional: optional enrichment
            country_wiki_data = {}
    finally:
        pool.shutdown(wait=False, cancel_futures=True)

    # If no local data but we have country wiki summary, use that
    if not local_data.get("extract") and country_wiki_data.get("extract"):
        local_data = country_wiki_data

    # Build languages list
    languages = country_data.get("languages", {})
    lang_list = list(languages.values()) if isinstance(languages, dict) else []

    # Build currencies
    currencies = country_data.get("currencies", {})
    currency_list = []
    if isinstance(currencies, dict):
        for v in currencies.values():
            if isinstance(v, dict):
                symbol = v.get("symbol", "")
                name = v.get("name", "")
                currency_list.append(f"{name} ({symbol})" if symbol else name)

    result = {
        "coordinates": {"lat": lat, "lng": lng},
        "location": geo,
        "country": {
            "name": country_data.get("name", {}).get("common", country_name),
            "official_name": country_data.get("name", {}).get("official", ""),
            "leader": leader_data.get("leader", "Unknown"),
            "government_type": leader_data.get("government_type", "Unknown"),
            "population": country_data.get("population", 0),
            "capital": (
                (country_data.get("capital") or ["Unknown"])[0]
                if isinstance(country_data.get("capital"), list)
                else "Unknown"
            ),
            "languages": lang_list,
            "currencies": currency_list,
            "region": country_data.get("region", ""),
            "subregion": country_data.get("subregion", ""),
            "area_km2": country_data.get("area", 0),
            "flag_emoji": country_data.get("flag", ""),
        },
        "local": {
            "name": city_name,
            "state": state_name,
            "description": local_data.get("description", ""),
            "summary": local_data.get("extract", ""),
            "thumbnail": local_data.get("thumbnail", ""),
        },
    }

    dossier_cache[cache_key] = result
    return result