export interface ParsedUA {
  device: "Desktop" | "Mobile" | "Tablet";
  browser: string;
  os: string;
}

export function parseUserAgent(ua: string): ParsedUA {
  if (!ua) return { device: "Desktop", browser: "Inconnu", os: "Inconnu" };

  // Device type
  const isTablet = /iPad|Tablet|PlayBook/i.test(ua) || (/Android/i.test(ua) && !/Mobile/i.test(ua));
  const isMobile = !isTablet && /Mobile|Android|iPhone|iPod|BlackBerry|IEMobile|Opera Mini|Windows Phone/i.test(ua);
  const device: ParsedUA["device"] = isTablet ? "Tablet" : isMobile ? "Mobile" : "Desktop";

  // Browser
  let browser = "Inconnu";
  if (/Edg\//i.test(ua)) browser = "Edge";
  else if (/OPR\//i.test(ua) || /Opera/i.test(ua)) browser = "Opera";
  else if (/SamsungBrowser/i.test(ua)) browser = "Samsung Browser";
  else if (/Firefox/i.test(ua)) browser = "Firefox";
  else if (/Chrome/i.test(ua)) browser = "Chrome";
  else if (/Safari/i.test(ua)) browser = "Safari";
  else if (/MSIE|Trident/i.test(ua)) browser = "Internet Explorer";
  else if (/curl/i.test(ua)) browser = "cURL";

  // OS
  let os = "Inconnu";
  if (/Windows NT 10/i.test(ua)) os = "Windows 10/11";
  else if (/Windows NT 6\.3/i.test(ua)) os = "Windows 8.1";
  else if (/Windows NT 6\.1/i.test(ua)) os = "Windows 7";
  else if (/Windows/i.test(ua)) os = "Windows";
  else if (/iPhone OS ([\d_]+)/i.test(ua)) {
    const m = ua.match(/iPhone OS ([\d_]+)/i);
    os = `iOS ${m ? m[1].replace(/_/g, ".") : ""}`;
  } else if (/iPad.*OS ([\d_]+)/i.test(ua)) {
    const m = ua.match(/OS ([\d_]+)/i);
    os = `iPadOS ${m ? m[1].replace(/_/g, ".") : ""}`;
  } else if (/Android ([\d.]+)/i.test(ua)) {
    const m = ua.match(/Android ([\d.]+)/i);
    os = `Android ${m ? m[1] : ""}`;
  } else if (/Mac OS X ([\d_]+)/i.test(ua)) {
    const m = ua.match(/Mac OS X ([\d_]+)/i);
    os = `macOS ${m ? m[1].replace(/_/g, ".") : ""}`;
  } else if (/Linux/i.test(ua)) os = "Linux";

  return { device, browser, os };
}