import csv
import importlib.resources
import logging

import requests

log = logging.getLogger(__name__)

NOMINATIM_URL = "https://nominatim.openstreetmap.org/search"
_USER_AGENT = "planemapper/0.1 (https://github.com/football2801/planeMapper)"


def _lookup_icao(code: str) -> tuple[float, float, str] | None:
    traversable = importlib.resources.files("planemapper.data").joinpath("airports.csv")
    with traversable.open("r", encoding="utf-8") as fh:
        reader = csv.DictReader(fh)
        for row in reader:
            if row["ident"] == code:
                return float(row["latitude_deg"]), float(row["longitude_deg"]), row["name"]
    return None


def _geocode(query: str) -> tuple[float, float, str] | None:
    resp = requests.get(
        NOMINATIM_URL,
        params={"q": query, "format": "json", "limit": 1},
        headers={"User-Agent": _USER_AGENT},
        timeout=10,
    )
    resp.raise_for_status()
    results = resp.json()
    if not results:
        return None
    r = results[0]
    return float(r["lat"]), float(r["lon"]), r["display_name"]


def resolve(query: str) -> tuple[float, float, str]:
    query = query.strip().upper()
    if len(query) == 4 and query.isalpha():
        result = _lookup_icao(query)
        if result is None:
            raise ValueError("ICAO code not found — try an address instead")
        log.info("ICAO %s resolved to %s", query, result[2])
        return result
    result = _geocode(query)
    if result is None:
        raise ValueError("Location not found — try a different search term")
    log.info("Address '%s' resolved to %s", query, result[2])
    return result