export async function fetchSuggestion(prefix, suffix, apiUrl = 'http://localhost:8000/v1/completions') {
  const res = await fetch(apiUrl, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ prefix, suffix, languageId: 'markdown' }),
  })

  if (!res.ok) {
    throw new Error(`HTTP ${res.status}`)
  }

  const reader = res.body?.getReader()
  if (!reader) throw new Error('No reader available')

  let text = ''
  while (true) {
    const { done, value } = await reader.read()
    if (done) break
    const chunk = new TextDecoder().decode(value)
    const lines = chunk.split('\n').filter(l => l.startsWith('data: '))
    for (const line of lines) {
      try {
        const data = JSON.parse(line.slice(6))
        if (data.content) text += data.content
        if (data.done || data.error) break
      } catch (e) {}
    }
  }
  return text
}