import type { InteractiveDemoV1, ValidationIssue } from '@/lib/interactive-demo'

export type GenerateInteractiveDemoResponse =
  | { ok: true; demo: InteractiveDemoV1; attempts: number }
  | {
      ok: false
      error: string
      issues?: ValidationIssue[]
      quotaExceeded?: boolean
      status?: number
    }

export async function generateInteractiveDemo(params: {
  content: string
  selection?: string | null
  lang?: string
  noteId?: string
}): Promise<GenerateInteractiveDemoResponse> {
  const controller = new AbortController()
  const timeout = setTimeout(() => controller.abort(), 170_000)
  let res: Response
  try {
    res = await fetch('/api/ai/interactive-demo', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        content: params.content,
        selection: params.selection,
        lang: params.lang,
        noteId: params.noteId,
      }),
      signal: controller.signal,
    })
  } catch (err) {
    clearTimeout(timeout)
    const aborted = err instanceof Error && err.name === 'AbortError'
    return {
      ok: false,
      error: aborted
        ? 'Génération trop longue — réessaie (ou raccourcis la note)'
        : err instanceof Error
          ? err.message
          : 'Network error',
    }
  } finally {
    clearTimeout(timeout)
  }

  const data = await res.json().catch(() => ({}))

  if (res.status === 402) {
    return {
      ok: false,
      error: data.error || 'Quota exceeded',
      quotaExceeded: true,
      status: 402,
    }
  }

  if (!res.ok) {
    return {
      ok: false,
      error: data.error || `HTTP ${res.status}`,
      issues: data.issues,
      status: res.status,
    }
  }

  return {
    ok: true,
    demo: data.demo,
    attempts: data.attempts ?? 1,
  }
}