#!/usr/bin/env bash
# Subtitle fetch helper — recipe v1 Step 4.
#
# Single-episode loop body. Runs against a Jellyfin instance reachable from
# nullstone via `docker exec jellyfin curl ...`. Driver loops should source or
# call this per episode.
#
# Picker: highest DownloadCount among results that are NOT
# (HearingImpaired|MachineTranslated|AiTranslated|Forced); 23.976fps preferred.
# Falls back to all results if every candidate is HI/MT/AI/Forced.
#
# Side effects:
#   - POSTs RemoteSearch download (consumes 1 of 20 daily free-tier slots)
#   - docker cp's the resulting metadata-cache srt to MEDIA_DIR
#
# Caller env:
#   TOK         Jellyfin admin X-Emby-Token
#   EP          Jellyfin episode item id
#   MEDIA_DIR   destination dir on nullstone, e.g.
#               '/home/user/media/tv/American Dad! (2005)/Season 01'
#   MEDIA_BASE  filename without extension, must match the .mkv basename
#
# Exits non-zero on no-subs (1) or download HTTP != 204 (2).
# Output to stdout: "OK <ep-id> -> <dest path>".
# Output to stderr: chosen sub release name + fps + DownloadCount, or error.

set -euo pipefail

: "${TOK:?TOK required}"
: "${EP:?EP required}"
: "${MEDIA_DIR:?MEDIA_DIR required}"
: "${MEDIA_BASE:?MEDIA_BASE required}"

NULLSTONE="${NULLSTONE:-user@192.168.0.100}"

RAW=$(ssh "$NULLSTONE" "docker exec jellyfin curl -s -H 'X-Emby-Token: $TOK' \
  'http://localhost:8096/Items/$EP/RemoteSearch/Subtitles/eng'")

SUBID=$(printf '%s' "$RAW" | python3 -c "
import json, sys
subs = json.load(sys.stdin)
clean = [s for s in subs
         if not (s.get('HearingImpaired') or s.get('MachineTranslated')
                 or s.get('AiTranslated') or s.get('Forced'))]
if not clean:
    clean = subs
fps2398 = [s for s in clean if abs(s.get('FrameRate', 0) - 23.976) < 0.01]
pool = fps2398 if fps2398 else clean
pool.sort(key=lambda s: -s.get('DownloadCount', 0))
if pool:
    print(pool[0]['Id'])
    print(pool[0]['Name'], pool[0].get('FrameRate'),
          pool[0].get('DownloadCount'), file=sys.stderr)
")

if [[ -z "$SUBID" ]]; then
  echo "NO-SUBS for $EP" >&2
  exit 1
fi

HTTP=$(ssh "$NULLSTONE" "docker exec jellyfin curl -s -o /dev/null -X POST \
  -H 'X-Emby-Token: $TOK' \
  'http://localhost:8096/Items/$EP/RemoteSearch/Subtitles/$SUBID' \
  -w '%{http_code}'")

if [[ "$HTTP" != "204" ]]; then
  echo "DL-FAIL HTTP=$HTTP for $EP $SUBID" >&2
  exit 2
fi

SHARD="${EP:0:2}"
SRC_IN_CONTAINER="/config/metadata/library/$SHARD/$EP/$MEDIA_BASE.eng.srt"
DEST="$MEDIA_DIR/$MEDIA_BASE.eng.srt"

ssh "$NULLSTONE" "docker cp \"jellyfin:$SRC_IN_CONTAINER\" \"$DEST\"" >/dev/null
echo "OK $EP -> $DEST"