/**
 * Coarse device/browser classification from the User-Agent header. No
 * library, no raw UA string ever stored - just one bucket per request,
 * computed on the fly and discarded after classification. Not meant to be
 * precise (e.g. WebView vs. real browser); good enough for the "device
 * type" / "browser" breakdown in the Analytics dashboard.
 */

export type DeviceType = "mobile" | "desktop" | "tablet";
export type BrowserFamily = "chrome" | "firefox" | "safari" | "edge" | "other";

export function classifyDevice(userAgent: string): DeviceType {
  const ua = userAgent.toLowerCase();
  if (/ipad|tablet(?!.*mobile)|(android(?!.*mobile))/.test(ua)) return "tablet";
  if (/mobi|iphone|ipod|android/.test(ua)) return "mobile";
  return "desktop";
}

export function classifyBrowser(userAgent: string): BrowserFamily {
  const ua = userAgent.toLowerCase();
  // Order matters: Edge/Chrome UAs also contain "safari"; Chrome UAs also
  // contain "chrome" but so do Edge/Opera - check the most specific tokens first.
  if (/edg\//.test(ua)) return "edge";
  if (/chrome\/|crios\//.test(ua)) return "chrome";
  if (/firefox\/|fxios\//.test(ua)) return "firefox";
  if (/safari\//.test(ua)) return "safari";
  return "other";
}