Make an AI mascot your ads can run every week

curl -s https://ark.ap-southeast.bytepluses.com/api/v3/contents/generations/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $ARK_API_KEY" \
  -d '{
    "model": "dreamina-seedance-2-0-260128",
    "content": [
      { "type": "text", "text": "Vertical selfie UGC video. A woman in her 30s in a sunny kitchen holds a paper bakery bag up to the phone camera, takes a bite of a croissant and says: \"Okay. This croissant is ridiculous.\" Handheld phone camera, natural light, one take, no music." }
    ],
    "ratio": "9:16",
    "resolution": "720p",
    "duration": 8,
    "generate_audio": true,
    "watermark": false
  }'
# -> { "id": "cgt-..." }

curl -s https://ark.ap-southeast.bytepluses.com/api/v3/contents/generations/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $ARK_API_KEY" \
  -d '{
    "model": "dreamina-seedance-2-0-260128",
    "content": [
      { "type": "text", "text": "Replace the woman in Video 1 with the croissant character in Image 1. Keep the camera move, framing, timing and the line she says from Video 1. Keep the character identical to Image 1." },
      { "type": "image_url", "image_url": { "url": "https://your-cdn/crumb-sheet.jpg" }, "role": "reference_image" },
      { "type": "video_url", "video_url": { "url": "https://your-cdn/base-clip.mp4" }, "role": "reference_video" }
    ],
    "ratio": "adaptive",
    "duration": -1,
    "resolution": "720p",
    "generate_audio": true,
    "watermark": false
  }'

# Poll until "status" is "succeeded", then download content.video_url (it expires in 24 hours).
curl -s https://ark.ap-southeast.bytepluses.com/api/v3/contents/generations/tasks/$TASK_ID \
  -H "Authorization: Bearer $ARK_API_KEY"

const ARK = 'https://ark.ap-southeast.bytepluses.com/api/v3/contents/generations/tasks'

type Status = 'queued' | 'running' | 'succeeded' | 'failed' | 'cancelled' | 'expired'
interface ArkTask {
  id: string
  status: Status
  content?: { video_url?: string }
  error?: { code: string; message: string } | null
}

const headers = () => {
  const key = process.env.ARK_API_KEY
  if (!key) throw new Error('ARK_API_KEY is not set')
  return { 'Content-Type': 'application/json', Authorization: `Bearer ${key}` }
}

/** Swap the character from a reference sheet into a Seedance base clip. Returns the task id. */
export async function createSwap(sheetUrl: string, baseClipUrl: string): Promise<string> {
  const res = await fetch(ARK, {
    method: 'POST',
    headers: headers(),
    body: JSON.stringify({
      model: 'dreamina-seedance-2-0-260128',
      content: [
        { type: 'text', text: "Replace the woman in Video 1 with the croissant character in Image 1. Keep the camera move, framing, timing and the line she says from Video 1. Keep the character identical to Image 1." },
        { type: 'image_url', image_url: { url: sheetUrl }, role: 'reference_image' },
        { type: 'video_url', video_url: { url: baseClipUrl }, role: 'reference_video' },
      ],
      ratio: 'adaptive',
      duration: -1,
      resolution: '720p',
      generate_audio: true,
      watermark: false,
    }),
  })
  if (!res.ok) throw new Error(`create failed ${res.status}: ${await res.text()}`)
  const { id } = (await res.json()) as { id?: string }
  if (!id) throw new Error('create returned no task id')
  return id
}

/** Poll every 10 seconds for up to 15 minutes. */
export async function waitForVideo(id: string): Promise<string> {
  const deadline = Date.now() + 15 * 60_000
  while (Date.now() < deadline) {
    const res = await fetch(`${ARK}/${id}`, { headers: headers() })
    if (!res.ok) throw new Error(`poll failed ${res.status}: ${await res.text()}`)
    const task = (await res.json()) as ArkTask
    if (task.status === 'succeeded') {
      // A success with no URL is still a failure.
      if (!task.content?.video_url) throw new Error('succeeded without a video_url')
      return task.content.video_url // expires in 24 hours: copy it to your own storage now
    }
    if (task.status !== 'queued' && task.status !== 'running') {
      throw new Error(`task ${task.status}: ${task.error?.code ?? ''} ${task.error?.message ?? ''}`)
    }
    await new Promise((r) => setTimeout(r, 10_000))
  }
  throw new Error(`task ${id} timed out`)
}