#!/usr/bin/env bash
# Generisches Audio-Batch-Script via OpenAI TTS.
# Nimmt JSON-Textbuch mit Struktur:
#   { "lines": [ {"id": "...", "text": "..."} ] }
# und generiert MP3s in sounds/radio/<id>.mp3
#
# Voraussetzung: OPENAI_API_KEY (aus App/.env.local)
#
# Aufruf:
#   set -a; source App/.env.local; set +a
#   App/sims/heli/scripts/generate-audio-openai.sh tower-geo-lines.json
#   App/sims/heli/scripts/generate-audio-openai.sh tower-start-lines.json
#   FORCE=1 …   überschreibt bestehende
#   OPENAI_VOICE=shimmer …   andere Stimme
set -e
: "${OPENAI_API_KEY:?OPENAI_API_KEY muss gesetzt sein}"

VOICE="${OPENAI_VOICE:-nova}"
MODEL="${OPENAI_MODEL:-gpt-4o-mini-tts}"
# Stil-Instruktion nur bei gpt-4o-mini-tts wirksam. Warmherzige Fluglotsin,
# ruhig, klare deutsche Aussprache, als ob sie Schuelerinnen begleitet.
INSTRUCTIONS="${OPENAI_TTS_INSTRUCTIONS:-Speak warmly and patiently like an encouraging female flight controller guiding a young student co-pilot. Unhurried, clear, friendly German pronunciation. Gentle reassuring tone, never robotic.}"

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
OUT_DIR="$SCRIPT_DIR/../sounds/radio"
mkdir -p "$OUT_DIR"

JSON_INPUT="$1"
if [ -z "$JSON_INPUT" ]; then
  echo "Usage: $0 <json-file>"
  exit 2
fi
JSON_FILE="$SCRIPT_DIR/$JSON_INPUT"
if [ ! -f "$JSON_FILE" ]; then
  echo "Datei nicht gefunden: $JSON_FILE"; exit 2
fi

echo "Modell: $MODEL · Stimme: $VOICE"
echo "Quelle: $JSON_INPUT"
echo

generate() {
  local id="$1"
  local text="$2"
  local out="$OUT_DIR/${id}.mp3"
  if [ -f "$out" ] && [ -z "$FORCE" ]; then
    echo "ok  ${id}.mp3 schon da"
    return 0
  fi
  echo "gen ${id}"
  local payload
  payload=$(TEXT="$text" MODEL="$MODEL" VOICE="$VOICE" INSTR="$INSTRUCTIONS" python -c '
import json, os
body = {
  "model": os.environ["MODEL"],
  "voice": os.environ["VOICE"],
  "input": os.environ["TEXT"],
  "response_format": "mp3"
}
# instructions nur bei gpt-4o-mini-tts unterstuetzt
if "mini-tts" in os.environ["MODEL"]:
    body["instructions"] = os.environ["INSTR"]
print(json.dumps(body, ensure_ascii=False))')
  local http
  http=$(curl -sS -w "%{http_code}" -o "$out" \
    -X POST https://api.openai.com/v1/audio/speech \
    -H "Authorization: Bearer $OPENAI_API_KEY" \
    -H "Content-Type: application/json; charset=utf-8" \
    -d "$payload")
  if [ "$http" != "200" ]; then
    echo "FEHLER ${id}: HTTP $http"
    cat "$out"; echo; rm -f "$out"
    return 1
  fi
  local size; size=$(wc -c <"$out")
  if [ "$size" -lt 1500 ]; then
    echo "FEHLER ${id}: Datei zu klein ($size B)"
    cat "$out"; rm -f "$out"
    return 1
  fi
  echo "ok  ${id}.mp3 (${size} B)"
  sleep 0.2
}

ok=0; fail=0
while IFS=$'\t' read -r id text; do
  [ -z "$id" ] && continue
  if generate "$id" "$text"; then ok=$((ok+1)); else fail=$((fail+1)); fi
done < <(python -c "
import json, sys
d = json.load(sys.stdin)
for line in d['lines']: print(line['id'] + '\t' + line['text'])
" < "$JSON_FILE")

echo
echo "Zusammenfassung: ok=$ok, fail=$fail"
ls -1 "$OUT_DIR"/*.mp3 2>/dev/null | wc -l | xargs printf "Dateien im Ordner: %s\n"