# 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 $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  --data-binary @- <<'SANDBASE_JSON'
{
  "model": "kwaivgi/kling-video/o3/pro/video-to-video",
  "video": "https://static.sandbase.ai/examples/kwaivgi/mirrored/example_inputs/kling-o3/pro-v2v-reference/video_reference.mp4",
  "images": [
    "https://static.sandbase.ai/examples/kwaivgi/mirrored/example_inputs/kling-o3/pro-v2v-reference/image_url1.jpg",
    "https://static.sandbase.ai/examples/kwaivgi/mirrored/example_inputs/kling-o3/pro-v2v-reference/image_url2.jpg"
  ],
  "prompt": "Integrate @Element1 in the scene. Style video should be following watercolor style of @Image1",
  "duration": "5",
  "shot_type": "customize",
  "keep_audio": false,
  "aspect_ratio": "16:9"
}
SANDBASE_JSON
)
run_id=$(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"