import type { Notification } from './types';

// The visible text, composed HERE from the category — never sent by a producer and never carrying
// content. This is what stops "Re: your invoice from Acme" reaching Apple or Google.
//
// It has to exist somewhere: APNs and FCM both need a title/body to render a banner, so "send nothing"
// is not an option. What we control is that the string is generic and derived from `type` alone, so the
// most either service learns is the category and the timing. The app can render its own copy from the
// same data payload if it wants better wording; this is the fallback that goes over the wire.

export function renderTitle(n: Notification): string {
  switch (n.type) {
    case 'job':
      return n.ok === false ? 'Job failed' : 'Job finished';
    case 'mail':
      return n.count && n.count > 1 ? `${n.count} new emails` : 'New email';
    case 'agent':
      return 'Agent finished';
    case 'download':
      return 'Download complete';
    case 'test':
      return 'Officer';
  }
}

/**
 * Deliberately empty for most categories. A banner with a title and no body is the least we can send
 * while still being a usable notification, and every word added is a word Apple and Google get to read.
 */
export function renderBody(n: Notification): string {
  return n.type === 'test' ? 'Test notification' : '';
}