const BOT_PATTERNS =
  /bot|crawl|spider|slurp|mediapartners|adsbot|facebookexternalhit|twitterbot|linkedinbot|whatsapp|telegram|pinterest|slack|discordbot|applebot|bingpreview|google-read-aloud|ia_archiver|mj12bot|ahrefs|semrush|dotbot|rogerbot|screaming\.?frog/i;

export function isBot(ua: string): boolean {
  return BOT_PATTERNS.test(ua);
}

export function anonymizeIp(ip: string): string {
  const mapped = ip.match(/^::ffff:(\d+\.\d+\.\d+)\.\d+$/i);
  if (mapped) return `${mapped[1]}.0`;

  const v4 = ip.match(/^(\d+\.\d+\.\d+)\.\d+$/);
  if (v4) return `${v4[1]}.0`;

  const v6parts = ip.split(":");
  if (v6parts.length >= 3) return `${v6parts.slice(0, 3).join(":")}::`;

  return "0.0.0.0";
}

export type DeviceType = "mobile" | "tablet" | "desktop";
export type BrowserName = "Chrome" | "Firefox" | "Safari" | "Edge" | "Opera" | "Other";
export type OsName = "Windows" | "macOS" | "iOS" | "Android" | "Linux" | "Other";

export function parseDevice(ua: string): DeviceType {
  if (/tablet|ipad|playbook|silk/i.test(ua)) return "tablet";
  if (/mobile|android.*mobile|iphone|ipod|blackberry|windows phone/i.test(ua)) return "mobile";
  return "desktop";
}

export function parseBrowser(ua: string): BrowserName {
  if (/edg\//i.test(ua)) return "Edge";
  if (/opr\//i.test(ua)) return "Opera";
  if (/firefox\//i.test(ua)) return "Firefox";
  if (/chrome\//i.test(ua)) return "Chrome";
  if (/safari\//i.test(ua)) return "Safari";
  return "Other";
}

export function parseOs(ua: string): OsName {
  if (/windows/i.test(ua)) return "Windows";
  if (/iphone|ipad|ipod/i.test(ua)) return "iOS";
  if (/android/i.test(ua)) return "Android";
  if (/mac os x|macintosh/i.test(ua)) return "macOS";
  if (/linux/i.test(ua)) return "Linux";
  return "Other";
}