Function prepareGravityMessages

web/src/lib/ad-providers/gravity.ts:69–83

* Gravity only wants the last user turn plus the last preceding assistant * turn for relevancy signals. We also strip empties and normalize user * messages through the tag.

(messages: AdMessage[])

 * messages through the <user_message> tag.
 */
function prepareGravityMessages(messages: AdMessage[]): AdMessage[] {
  const cleaned = messages
    .filter((m) => m.content)
    .map((m) =>
      m.role === 'user'
        ? { ...m, content: extractLastUserMessageContent(m.content) }
        : m,
    )
  const lastUserIndex = cleaned.findLastIndex((m) => m.role === 'user')
  const lastUser = lastUserIndex >= 0 ? cleaned[lastUserIndex] : undefined
  const lastAssistant = cleaned
    .slice(0, lastUserIndex >= 0 ? lastUserIndex : cleaned.length)
    .findLast((m) => m.role === 'assistant')
  return buildArray(lastAssistant, lastUser)
}

export function createGravityProvider(config: { apiKey: string }): AdProvider {
  return {