src/lib/mistral-summarize.ts

/**
 * Summarize article text for audio playback using Mistral chat completions.
 */
export async function summarizeForAudio(
  title: string,
  body: string,
  apiKey: string,
): Promise<string> {
  const response = await fetch('https://api.mistral.ai/v1/chat/completions', {
    method: 'POST',
    headers: {
      Authorization: `Bearer ${apiKey}`,
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({
      model: 'mistral-small-latest',
      messages: [
        {
          role: 'system',
          content:
            'You summarize articles for audio playback. Write 2–4 natural spoken sentences. No bullet points, no markdown, no special characters. Clean up any HTML artifacts or boilerplate.',
        },
        {
          role: 'user',
          content: `Title: ${title}\n\n${body}`,
        },
      ],
      max_tokens: 350,
      temperature: 0.4,
    }),
  })

  if (!response.ok) {
    const err = await response.text().catch(() => response.statusText)
    throw new Error(`Mistral summarize error ${response.status}: ${err}`)
  }

  const data = await response.json()
  return (data.choices?.[0]?.message?.content ?? '').trim()
}