"""TMDB API client. Uses v3 API with api_key query param."""
import requests
from typing import List, Dict, Optional

BASE = "https://api.themoviedb.org/3"
IMG = "https://image.tmdb.org/t/p"


def _img(path: Optional[str], size: str = "w500") -> str:
    if not path:
        return ""
    return f"{IMG}/{size}{path}"


def search_movies(api_key: str, query: str) -> List[Dict]:
    if not api_key or not query.strip():
        return []
    r = requests.get(f"{BASE}/search/movie", params={"api_key": api_key, "query": query}, timeout=15)
    r.raise_for_status()
    data = r.json().get("results", []) or []
    out = []
    for m in data[:20]:
        year = None
        if m.get("release_date"):
            try: year = int(m["release_date"].split("-")[0])
            except Exception: pass
        out.append({
            "tmdb_id": m["id"],
            "title": m.get("title") or m.get("name") or "",
            "year": year,
            "overview": m.get("overview") or "",
            "poster_url": _img(m.get("poster_path"), "w500"),
            "backdrop_url": _img(m.get("backdrop_path"), "original"),
        })
    return out


def get_movie(api_key: str, tmdb_id: int) -> Dict:
    """Return rich movie details with cast/crew."""
    r = requests.get(
        f"{BASE}/movie/{tmdb_id}",
        params={"api_key": api_key, "append_to_response": "credits"},
        timeout=15,
    )
    r.raise_for_status()
    m = r.json()
    year = None
    if m.get("release_date"):
        try: year = int(m["release_date"].split("-")[0])
        except Exception: pass

    credits = m.get("credits", {}) or {}
    cast = [c["name"] for c in (credits.get("cast") or [])[:8] if c.get("name")]
    crew = credits.get("crew") or []
    director = next((c["name"] for c in crew if c.get("job") == "Director"), "")
    genres = [g["name"] for g in (m.get("genres") or []) if g.get("name")]

    # Map TMDB certifications to our rating scale (best effort, US fallback)
    rating = "NR"
    try:
        rel = requests.get(
            f"{BASE}/movie/{tmdb_id}/release_dates",
            params={"api_key": api_key}, timeout=10,
        ).json()
        for r_country in rel.get("results", []):
            if r_country.get("iso_3166_1") == "US":
                for d in r_country.get("release_dates", []) or []:
                    cert = (d.get("certification") or "").strip()
                    if cert:
                        rating = cert
                        break
                break
    except Exception:
        pass

    return {
        "tmdb_id": m["id"],
        "title": m.get("title") or "",
        "year": year,
        "description": m.get("overview") or "",
        "duration_minutes": m.get("runtime") or 0,
        "rating": rating or "NR",
        "genres": genres,
        "cast": cast,
        "director": director,
        "poster_url": _img(m.get("poster_path"), "w500"),
        "backdrop_url": _img(m.get("backdrop_path"), "original"),
    }