#!/usr/bin/env python3
"""run_from_jellyfin.py — resolve a Jellyfin title to its media file and run scene_analyze.

Looks up a Movie/Episode in Jellyfin, reads its on-disk Path (Jellyfin and this
tool must share the same media mount), filters the gallery down to that
title's credited cast (via filter_gallery's logic, fewer look-alike
mismatches), and runs scene_analyze against the resolved file.

Usage:
    python scripts/run_from_jellyfin.py \\
        --jellyfin-url http://jellyfin.local:8096 \\
        --api-key YOUR_API_KEY \\
        --title "The Matrix" \\
        --gallery whole_gallery.json \\
        -- --fps 5 --verbosity 2

Anything after "--" is passed through unchanged to scene_analyze.
"""

import argparse
import json
import subprocess
import sys
import tempfile
from pathlib import Path

sys.path.insert(0, str(Path(__file__).resolve().parent))
from filter_gallery import jf_get, find_item_id, fetch_cast_person_ids


def fetch_item_path(base_url: str, api_key: str, item_id: str) -> tuple[str, str]:
    """Return (Name, Path) for a Jellyfin item."""
    data = jf_get(base_url, api_key, f"/Items/{item_id}", Fields="Path")
    path = data.get("Path")
    if not path:
        raise ValueError(f"Item {item_id} has no Path (not a single media file?)")
    return data.get("Name", item_id), path


def main():
    parser = argparse.ArgumentParser(
        description=__doc__,
        formatter_class=argparse.RawDescriptionHelpFormatter,
    )
    parser.add_argument("--jellyfin-url", required=True)
    parser.add_argument("--api-key", required=True)
    group = parser.add_mutually_exclusive_group(required=True)
    group.add_argument("--item-id", help="Jellyfin item id of the title")
    group.add_argument("--title", help="Title to search for (uses first match)")
    parser.add_argument("--item-types", default="Movie,Episode",
                         help="Item types to search when using --title (default: Movie,Episode)")
    parser.add_argument("--gallery", required=True,
                         help="Global gallery.json built by make_jellyfin_gallery.py")
    parser.add_argument("--no-filter", action="store_true",
                         help="Skip per-title cast filtering and pass --gallery through as-is")
    parser.add_argument("--output", default=None,
                         help="scene_analyze output JSON (default: <title>.json)")
    parser.add_argument("--bin", default="build/scene_analyze",
                         help="Path to scene_analyze binary (default: build/scene_analyze)")
    parser.add_argument("--dry-run", action="store_true",
                         help="Resolve and print the scene_analyze command without running it")
    args, extra = parser.parse_known_args()
    if extra and extra[0] == "--":
        extra = extra[1:]

    item_id = args.item_id
    if item_id is None:
        item_id = find_item_id(args.jellyfin_url, args.api_key, args.title, args.item_types.split(","))
        print(f"Resolved title to item id {item_id}", file=sys.stderr)

    name, movie_path = fetch_item_path(args.jellyfin_url, args.api_key, item_id)
    print(f"Resolved {name!r} -> {movie_path}", file=sys.stderr)
    if not Path(movie_path).is_file():
        sys.exit(f"Resolved path does not exist on this filesystem: {movie_path}\n"
                 f"(this tool must share Jellyfin's media mount)")

    output = args.output or f"{name}.json"

    gallery_path = args.gallery
    filtered_file = None
    if not args.no_filter:
        cast_ids = fetch_cast_person_ids(args.jellyfin_url, args.api_key, item_id)
        gallery = json.loads(Path(args.gallery).read_text())
        actors = [a for a in gallery.get("actors", [])
                  if (a.get("jellyfin_id") or a.get("jellyfin_person_id")) in cast_ids]
        print(f"Filtered gallery to {len(actors)}/{len(gallery.get('actors', []))} "
              f"actor(s) credited in {name!r}", file=sys.stderr)
        filtered_file = tempfile.NamedTemporaryFile(
            mode="w", suffix=".json", prefix="sae_gallery_", delete=False)
        json.dump({"actors": actors}, filtered_file)
        filtered_file.close()
        gallery_path = filtered_file.name

    cmd = [args.bin, "--movie", movie_path, "--gallery", gallery_path,
           "--output", output, *extra]
    print("Running:", " ".join(cmd), file=sys.stderr)

    if args.dry_run:
        return

    try:
        subprocess.run(cmd, check=True)
    finally:
        if filtered_file is not None:
            Path(filtered_file.name).unlink(missing_ok=True)


if __name__ == "__main__":
    main()