Kling 4.0 Reference to Video API

set -euo pipefail
: "${VIDGO_API_KEY:?Set VIDGO_API_KEY in your environment}"

REQUEST_BODY=$(cat <<'JSON'
{
  "model": "kwaivgi/kling-v4.0/reference-to-video",
  "input": {
    "prompt": "@Image1 is the character: a young violin maker with round glasses and a green work apron. @Image2 is the workshop: wooden benches, hanging violin bodies, a dusty window. In one continuous 8-second shot, she lifts a finished violin, tightens a peg, and plays a short bright phrase while the camera circles slowly around the bench. Keep her face, glasses and apron consistent with @Image1. Audio: the short violin phrase, a creaking floorboard, quiet street noise outside. No text, no logos, no watermark.",
    "duration": 8,
    "resolution": "720p",
    "aspect_ratio": "16:9",
    "reference_image_urls": [
      "https://cdn.vidgo.ai/apis/models/kwaivgi/kling-v4.0/reference-to-video/v1/01/input-01.webp",
      "https://cdn.vidgo.ai/apis/models/kwaivgi/kling-v4.0/reference-to-video/v1/01/input-02.webp"
    ]
  }
}
JSON
)

SUBMIT_RESPONSE=$(curl --silent --show-error --fail-with-body \
  --request POST \
  --url "https://api.vidgo.ai/api/generate/submit" \
  --header "Authorization: Bearer $VIDGO_API_KEY" \
  --header "Content-Type: application/json" \
  --data "$REQUEST_BODY")

TASK_ID=$(printf '%s' "$SUBMIT_RESPONSE" | jq -r '.data.task_id // .task_id // empty')
if [ -z "$TASK_ID" ]; then
  printf 'Submit response did not include task_id:
%s
' "$SUBMIT_RESPONSE" >&2
  exit 1
fi

while true; do
  STATUS_RESPONSE=$(curl --silent --show-error --fail-with-body \
    --url "https://api.vidgo.ai/api/generate/status/$TASK_ID" \
    --header "Authorization: Bearer $VIDGO_API_KEY")
  STATUS=$(printf '%s' "$STATUS_RESPONSE" | jq -r '.data.status // .status // empty')

  case "$STATUS" in
    finished)
      printf '%s' "$STATUS_RESPONSE" | jq -r '(.data.files // .files // [])[]?.file_url'
      break
      ;;
    failed)
      printf '%s' "$STATUS_RESPONSE" | jq -r '.data.error_message // .error_message // "Generation failed"' >&2
      exit 1
      ;;
    not_started|running)
      sleep 2
      ;;
    *)
      printf 'Unexpected task status: %s
' "$STATUS" >&2
      exit 1
      ;;
  esac
done