# 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 $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  --data-binary @- <<'SANDBASE_JSON'
{
  "model": "alibaba/wan/2.6/text-to-video",
  "prompt": "Rim light, low contrast, medium close-up, daylight, left-weighted composition, clean single-person shot, warm tones, soft light, sunny day, side light, daytime. A young girl sits in a field of tall grass, with two fluffy little donkeys standing behind her. The girl is about eleven or twelve, wearing a simple floral dress, hair in two braids, with an innocent smile. She sits cross-legged, gently playing with wildflowers beside her. The donkeys are sturdy with perked ears, curiously looking toward the camera. Sunlight bathes the field, creating a warm and natural atmosphere.",
  "duration": 5,
  "resolution": "720p",
  "aspect_ratio": "16:9"
}
SANDBASE_JSON
)
run_id=$(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"