# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
  -X POST "https://api.sandbase.ai/v1/run" \
  -H "Authorization: Bearer $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  --data-binary @- <<'SANDBASE_JSON'
{
  "model": "kwaivgi/kling-video/o3/4k/image-to-video",
  "image": "https://static.sandbase.ai/examples/mirrored/0ff4703452ec-8ABMp4n9rh3kfD2Rq8fHd_start_frame.png",
  "prompt": "The character walks forward slowly, with the camera following from behind.",
  "duration": 10,
  "end_image": "https://static.sandbase.ai/examples/alibaba/qwen-image-edit-plus-lora-gallery/add-background/output_url_1.png",
  "shot_type": "customize",
  "generate_audio": false
}
SANDBASE_JSON
)
run_id=$(printf '%s' "$result" | jq -r .id)
for attempt in $(seq 1 120); do
  status=$(printf '%s' "$result" | jq -r .status)
  case "$status" in completed|failed|timeout) break ;; esac
  sleep 2
  result=$(curl --fail-with-body --silent \
    -H "Authorization: Bearer $SANDBASE_API_KEY" \
    "https://api.sandbase.ai/v1/run/$run_id")
done
status=$(printf '%s' "$result" | jq -r .status)
[ "$status" = completed ] || { echo "Generation ended: $status" >&2; exit 1; }
printf '%s\n' "$result"