#!/usr/bin/env python3
"""tmdb-cli — The Movie Database API for agent-based media discovery.

Discover movies and TV shows by genre, rating, certification, and date.
Search by term, get details, check trending, upcoming, and now playing.
"""

import argparse
import json
import os
import sys
import warnings
from datetime import datetime, timezone
from typing import Any, Dict, List, Optional, Tuple

warnings.simplefilter("ignore")

import requests

# === Config ===
DEFAULT_SERVER = "https://api.themoviedb.org/3"
ENV_TOKEN = os.getenv("TMDB_ACCESS_TOKEN", "")
ENV_API_KEY = os.getenv("TMDB_API_KEY", "")
ENV_SERVER = os.getenv("TMDB_SERVER", DEFAULT_SERVER)

QUIET = False
GLOBAL_FLAGS: Dict[str, Any] = {"json": False, "dry_run": False, "quiet": False, "verbose": False}


def log(msg):
    if not QUIET and not GLOBAL_FLAGS.get("json", False):
        print(msg)


def warn(msg):
    print(f"Warning: {msg}", file=sys.stderr)


def die(msg, exit_code=1):
    print(f"Error: {msg}", file=sys.stderr)
    sys.exit(exit_code)


def emit(human, data):
    if GLOBAL_FLAGS.get("json", False):
        print(json.dumps(data, default=str))
    else:
        print(human)


def _preparse_global_flags(argv):
    GLOBAL_BOOLS = {"--json", "--dry-run", "--quiet", "--verbose"}
    flags, filtered = {}, [argv[0]]
    i = 1
    while i < len(argv):
        arg = argv[i]
        if arg in GLOBAL_BOOLS:
            flags[arg.lstrip("-").replace("-", "_")] = True
            i += 1
        elif arg in ("--help", "-h"):
            return flags, argv
        elif arg == "--":
            filtered.extend(argv[i:])
            break
        else:
            filtered.append(arg)
            i += 1
    return flags, filtered


class TMDBClient:
    """TMDb API v3 client."""

    def __init__(self, dry_run=False):
        self.token = ENV_TOKEN
        self.api_key = ENV_API_KEY
        self.server = ENV_SERVER.rstrip("/")
        self.dry_run = dry_run

    def _headers(self):
        h = {"Accept": "application/json"}
        if self.token:
            h["Authorization"] = f"Bearer {self.token}"
        return h

    def _get(self, path, params=None):
        url = f"{self.server}{path}"
        p = dict(params or {})
        if not self.token and self.api_key:
            p["api_key"] = self.api_key

        if self.dry_run:
            return {"dry_run": True, "url": url, "params": p}

        if not self.token and not self.api_key:
            die("Set TMDB_ACCESS_TOKEN or TMDB_API_KEY. Get one at https://www.themoviedb.org/settings/api")

        try:
            resp = requests.get(url, params=p, headers=self._headers(), timeout=30)
        except requests.ConnectionError as e:
            die(f"Cannot connect: {e}")

        if resp.status_code == 401:
            die("Auth failed (401). Check your TMDB_ACCESS_TOKEN.")
        if resp.status_code == 404:
            return None
        if resp.status_code >= 400:
            try:
                detail = resp.json()
            except Exception:
                detail = resp.text[:200]
            die(f"API error ({resp.status_code}): {detail}")
        return resp.json()

    def search_movie(self, query, page=1, lang="en-US"):
        return self._get("/search/movie", {"query": query, "page": page, "language": lang})

    def search_tv(self, query, page=1, lang="en-US"):
        return self._get("/search/tv", {"query": query, "page": page, "language": lang})

    def discover_movie(self, **kwargs):
        return self._get("/discover/movie", {k: v for k, v in kwargs.items() if v is not None})

    def discover_tv(self, **kwargs):
        return self._get("/discover/tv", {k: v for k, v in kwargs.items() if v is not None})

    def get_trending(self, media_type="movie", window="week"):
        return self._get(f"/trending/{media_type}/{window}")

    def get_movie(self, movie_id):
        return self._get(f"/movie/{movie_id}")

    def get_tv(self, tv_id):
        return self._get(f"/tv/{tv_id}")

    def get_movie_genres(self, lang="en-US"):
        return self._get("/genre/movie/list", {"language": lang})

    def get_tv_genres(self, lang="en-US"):
        return self._get("/genre/tv/list", {"language": lang})

    def get_movie_certifications(self):
        return self._get("/certification/movie/list")

    def get_upcoming(self, page=1, lang="en-US", region="US"):
        return self._get("/movie/upcoming", {"page": page, "language": lang, "region": region})

    def get_now_playing(self, page=1, lang="en-US", region="US"):
        return self._get("/movie/now_playing", {"page": page, "language": lang, "region": region})


def fmt_movie(m, idx=None):
    prefix = f"{idx}. " if idx else ""
    title = m.get("title", m.get("name", "?"))
    year = (m.get("release_date") or "")[:4]
    year_str = f" ({year})" if year else ""
    rating = m.get("vote_average", 0)
    vote_str = f" ★{rating:.1f}" if rating else ""
    return f"  {prefix}{title}{year_str}{vote_str}"


def fmt_tv(t, idx=None):
    prefix = f"{idx}. " if idx else ""
    name = t.get("name", "?")
    year = (t.get("first_air_date") or "")[:4]
    year_str = f" ({year})" if year else ""
    rating = t.get("vote_average", 0)
    vote_str = f" ★{rating:.1f}" if rating else ""
    return f"  {prefix}{name}{year_str}{vote_str}"


def cmd_movie_search(client, args):
    p = argparse.ArgumentParser(prog="tmdb-cli movie search")
    p.add_argument("--term", "-t", required=True)
    p.add_argument("--limit", type=int, default=10)
    parsed, _ = p.parse_known_args(args)
    if client.dry_run:
        return emit(f"[dry-run] Search movies: {parsed.term}", {"dry_run": True})
    data = client.search_movie(parsed.term) or {}
    results = data.get("results", [])[:parsed.limit]
    if not results:
        return emit("No movies found.", {"results": []})
    lines = [fmt_movie(r, i+1) for i, r in enumerate(results)]
    emit(f"{data.get('total_results', len(results))} result(s):\n" + "\n".join(lines),
         {"total": data.get("total_results"), "results": results})


def cmd_movie_discover(client, args):
    p = argparse.ArgumentParser(prog="tmdb-cli movie discover")
    p.add_argument("--genre", help="Genre name (e.g. horror, comedy)")
    p.add_argument("--certification", help="US certification (G, PG, PG-13, R, NC-17)")
    p.add_argument("--rating", type=float, help="Min vote average (0-10)")
    p.add_argument("--from", dest="release_date_gte", help="Release date from (YYYY-MM-DD)")
    p.add_argument("--to", dest="release_date_lte", help="Release date to (YYYY-MM-DD)")
    p.add_argument("--limit", type=int, default=10)
    parsed, _ = p.parse_known_args(args)

    if client.dry_run:
        return emit("[dry-run] Discover movies", {"dry_run": True})

    params = {"sort_by": "popularity.desc", "vote_count.gte": 50}
    if parsed.genre:
        genres = _resolve_movie_genre(client, parsed.genre)
        if genres:
            params["with_genres"] = genres
    if parsed.certification:
        params["certification_country"] = "US"
        params["certification"] = parsed.certification
    if parsed.rating:
        params["vote_average.gte"] = parsed.rating
    if parsed.release_date_gte:
        params["release_date.gte"] = parsed.release_date_gte
    if parsed.release_date_lte:
        params["release_date.lte"] = parsed.release_date_lte

    data = client.discover_movie(**params) or {}
    results = data.get("results", [])[:parsed.limit]
    if not results:
        return emit("No movies found.", {"results": []})
    lines = [fmt_movie(r, i+1) for i, r in enumerate(results)]
    emit(f"{data.get('total_results', len(results))} result(s):\n" + "\n".join(lines),
         {"total": data.get("total_results"), "results": results})


def _resolve_movie_genre(client, name):
    data = client.get_movie_genres() or {}
    for g in data.get("genres", []):
        if name.lower() in g.get("name", "").lower():
            return str(g["id"])
    return None


def cmd_tv_discover(client, args):
    p = argparse.ArgumentParser(prog="tmdb-cli tv discover")
    p.add_argument("--genre", help="Genre name")
    p.add_argument("--rating", type=float, help="Min vote average")
    p.add_argument("--from", dest="air_date_gte", help="Air date from")
    p.add_argument("--limit", type=int, default=10)
    parsed, _ = p.parse_known_args(args)

    if client.dry_run:
        return emit("[dry-run] Discover TV", {"dry_run": True})

    params = {"sort_by": "popularity.desc", "vote_count.gte": 20}
    if parsed.genre:
        genres = _resolve_tv_genre(client, parsed.genre)
        if genres:
            params["with_genres"] = genres
    if parsed.rating:
        params["vote_average.gte"] = parsed.rating
    if parsed.air_date_gte:
        params["first_air_date.gte"] = parsed.air_date_gte

    data = client.discover_tv(**params) or {}
    results = data.get("results", [])[:parsed.limit]
    if not results:
        return emit("No TV shows found.", {"results": []})
    lines = [fmt_tv(r, i+1) for i, r in enumerate(results)]
    emit(f"{data.get('total_results', len(results))} result(s):\n" + "\n".join(lines),
         {"total": data.get("total_results"), "results": results})


def _resolve_tv_genre(client, name):
    data = client.get_tv_genres() or {}
    for g in data.get("genres", []):
        if name.lower() in g.get("name", "").lower():
            return str(g["id"])


def cmd_trending(client, args):
    p = argparse.ArgumentParser(prog="tmdb-cli trending")
    p.add_argument("--type", default="movie", choices=["movie", "tv", "all"])
    p.add_argument("--window", default="week", choices=["day", "week"])
    p.add_argument("--limit", type=int, default=10)
    parsed, _ = p.parse_known_args(args)

    if client.dry_run:
        return emit("[dry-run] Get trending", {"dry_run": True})

    data = client.get_trending(parsed.type, parsed.window) or {}
    results = data.get("results", [])[:parsed.limit]
    if not results:
        return emit("No trending found.", {"results": []})

    lines, out = [], []
    for i, r in enumerate(results):
        title = r.get("title", r.get("name", "?"))
        media = r.get("media_type", parsed.type)
        year = (r.get("release_date") or r.get("first_air_date") or "")[:4]
        rating = r.get("vote_average", 0)
        lines.append(f"  {i+1}. {title} ({year}) ★{rating:.1f} [{media}]")
        out.append({"title": title, "year": year, "rating": rating, "media_type": media, "id": r.get("id")})
    emit(f"Trending {parsed.type} ({parsed.window}):\n" + "\n".join(lines), {"results": out})


def cmd_genre_list(client, args):
    p = argparse.ArgumentParser(prog="tmdb-cli genre list")
    p.add_argument("--type", required=True, choices=["movie", "tv"])
    parsed, _ = p.parse_known_args(args)

    if client.dry_run:
        return emit("[dry-run] List genres", {"dry_run": True})

    data = (client.get_movie_genres() if parsed.type == "movie" else client.get_tv_genres()) or {}
    genres = data.get("genres", [])
    if not genres:
        return emit("No genres found.", {"genres": []})
    lines = [f"  {g['id']:4} {g['name']}" for g in genres]
    emit(f"{parsed.type.title()} genres:\n" + "\n".join(lines), {"genres": genres})


def cmd_cert_list(client, args):
    if client.dry_run:
        return emit("[dry-run] List certifications", {"dry_run": True})
    data = client.get_movie_certifications() or {}
    certifications = data.get("certifications", {})
    us_certs = certifications.get("US", [])
    if not us_certs:
        return emit("No US certifications found.", {"certifications": []})
    lines = [f"  {c['certification']:6} {c.get('meaning', '')[:80]}" for c in us_certs]
    emit("US movie certifications:\n" + "\n".join(lines), {"certifications": us_certs})


def cmd_upcoming(client, args):
    p = argparse.ArgumentParser(prog="tmdb-cli movie upcoming")
    p.add_argument("--limit", type=int, default=10)
    parsed, _ = p.parse_known_args(args)
    if client.dry_run:
        return emit("[dry-run] Get upcoming movies", {"dry_run": True})
    data = client.get_upcoming() or {}
    results = data.get("results", [])[:parsed.limit]
    lines = [fmt_movie(r, i+1) for i, r in enumerate(results)] if results else ["  (none)"]
    emit(f"Upcoming movies:\n" + "\n".join(lines), {"results": results})


def main():
    global GLOBAL_FLAGS, QUIET
    GLOBAL_FLAGS, filtered_argv = _preparse_global_flags(sys.argv)
    if GLOBAL_FLAGS.get("quiet", False):
        QUIET = True
    if GLOBAL_FLAGS.get("json", False):
        warnings.simplefilter("ignore")

    parser = argparse.ArgumentParser(prog="tmdb-cli", description="The Movie Database API CLI.")
    sub = parser.add_subparsers(dest="resource")

    # movie
    mp = sub.add_parser("movie", help="Movie operations")
    msub = mp.add_subparsers(dest="action")
    s1 = msub.add_parser("search", help="Search movies"); s1.add_argument("--term", "-t", required=True); s1.add_argument("--limit", type=int, default=10)
    s2 = msub.add_parser("discover", help="Discover movies"); s2.add_argument("--genre"); s2.add_argument("--certification"); s2.add_argument("--rating", type=float); s2.add_argument("--from", dest="release_date_gte"); s2.add_argument("--to", dest="release_date_lte"); s2.add_argument("--limit", type=int, default=10)
    msub.add_parser("upcoming", help="Upcoming movies").add_argument("--limit", type=int, default=10)
    msub.add_parser("now-playing", help="Now playing movies").add_argument("--limit", type=int, default=10)

    # tv
    tp = sub.add_parser("tv", help="TV operations")
    tsub = tp.add_subparsers(dest="action")
    s3 = tsub.add_parser("search", help="Search TV"); s3.add_argument("--term", "-t", required=True); s3.add_argument("--limit", type=int, default=10)
    s4 = tsub.add_parser("discover", help="Discover TV"); s4.add_argument("--genre"); s4.add_argument("--rating", type=float); s4.add_argument("--from", dest="air_date_gte"); s4.add_argument("--limit", type=int, default=10)

    # flat
    sub.add_parser("genre", help="List genres").add_argument("--type", required=True, choices=["movie", "tv"])
    sub.add_parser("certification", help="List certifications")

    tr = sub.add_parser("trending", help="Trending content")
    tr.add_argument("--type", default="movie", choices=["movie", "tv", "all"])
    tr.add_argument("--window", default="week", choices=["day", "week"])
    tr.add_argument("--limit", type=int, default=10)

    args = parser.parse_args(filtered_argv[1:])
    if not args.resource:
        parser.print_help()
        sys.exit(1)

    client = TMDBClient(dry_run=GLOBAL_FLAGS.get("dry_run", False))

    # Dispatch
    if args.resource == "movie":
        if args.action == "search": cmd_movie_search(client, filtered_argv[filtered_argv.index("search")+1:])
        elif args.action == "discover": cmd_movie_discover(client, filtered_argv[filtered_argv.index("discover")+1:])
        elif args.action == "upcoming": cmd_upcoming(client, filtered_argv[filtered_argv.index("upcoming")+1:])
        else: parser.print_help()
    elif args.resource == "tv":
        if args.action == "search": cmd_movie_search(client, filtered_argv[filtered_argv.index("search")+1:])
        elif args.action == "discover": cmd_tv_discover(client, filtered_argv[filtered_argv.index("discover")+1:])
        else: parser.print_help()
    elif args.resource == "trending":
        cmd_trending(client, filtered_argv[filtered_argv.index("trending")+1:])
    elif args.resource == "genre":
        cmd_genre_list(client, filtered_argv[filtered_argv.index("list")+1:])
    elif args.resource == "certification":
        cmd_cert_list(client, filtered_argv[filtered_argv.index("list")+1:])
    else:
        parser.print_help()


if __name__ == "__main__":
    main()