Function buildMessageContent

web/src/app/api/v1/token-count/_post.ts:235–271

(
  content: unknown,
)

}

function buildMessageContent(
  content: unknown,
): string | ResponsesApiContentPart[] | null {
  if (typeof content === 'string') return content || null
  if (!Array.isArray(content)) {
    const text = JSON.stringify(content)
    return text || null
  }

  const hasImages = content.some(
    (part) => part.type === 'image' && typeof part.image === 'string' && part.image,
  )

  if (!hasImages) {
    const text = extractTextParts(content)
    return text || null
  }

  const parts: ResponsesApiContentPart[] = []
  for (const part of content) {
    if (part.type === 'text' && typeof part.text === 'string' && part.text) {
      parts.push({ type: 'input_text', text: part.text })
    } else if (part.type === 'json') {
      const text = typeof part.value === 'string' ? part.value : JSON.stringify(part.value)
      if (text) {
        parts.push({ type: 'input_text', text })
      }
    } else if (part.type === 'image') {
      const imageUrl = toImageUrl(part.image, part.mediaType)
      if (imageUrl) {
        parts.push({ type: 'input_image', image_url: imageUrl })
      }
    }
  }

  return parts.length > 0 ? parts : null
}

function toImageUrl(image: unknown, mediaType?: string): string | null {
  if (typeof image !== 'string' || !image) return null