/**
 * Identifier normalization functions
 *
 * Each normalizer strips formatting and standardizes the value
 * before it is hashed. This ensures consistent matching regardless
 * of how the original value was entered.
 */

const GMAIL_DOMAINS = new Set(['gmail.com', 'googlemail.com']);

/**
 * Normalize an email address: lowercase, trim whitespace,
 * handle Gmail dot-insensitivity and plus-addressing
 */
export function normalizeEmail(value: string): string {
  const trimmed = value.trim().toLowerCase();
  const [localPart, domain] = trimmed.split('@');

  if (!localPart || !domain) {
    return trimmed;
  }

  if (GMAIL_DOMAINS.has(domain)) {
    const withoutPlus = localPart.split('+')[0];
    const withoutDots = withoutPlus.replace(/\./g, '');
    return `${withoutDots}@${domain}`;
  }

  return trimmed;
}

/**
 * Normalize a phone number: strip formatting, apply E.164
 */
export function normalizePhone(value: string): string {
  const digits = value.replace(/\D/g, '');

  if (digits.length === 10) {
    return `1${digits}`;
  }

  return digits;
}

/**
 * Normalize a legal name: lowercase, collapse whitespace,
 * remove diacritics, strip common suffixes (Jr, Sr, III)
 */
export function normalizeLegalName(value: string): string {
  let normalized = value
    .trim()
    .toLowerCase()
    .normalize('NFD')
    .replace(/[\u0300-\u036f]/g, '');

  normalized = normalized.replace(/\s+/g, ' ');

  normalized = normalized.replace(/\b(jr|sr|ii|iii|iv)\b/gi, '').trim();

  normalized = normalized.replace(/\s+/g, ' ').trim();

  return normalized;
}

/**
 * Normalize a card number: strip spaces and dashes,
 * validate Luhn checksum format
 */
export function normalizeCardNumber(value: string): string {
  return value.replace(/[\s\-\.]/g, '');
}

/**
 * Normalize a payment app ID: lowercase, trim,
 * strip leading @ or $ symbols
 */
export function normalizePaymentAppId(value: string): string {
  const trimmed = value.trim().toLowerCase();
  return trimmed.replace(/^[@$]/, '');
}

/**
 * Normalize a canvas fingerprint: identity (hash is already deterministic)
 */
export function normalizeCanvasFp(value: string): string {
  return value.trim();
}

/**
 * Normalize a WebGL fingerprint: lowercase and trim
 */
export function normalizeWebglFp(value: string): string {
  return value.trim().toLowerCase();
}

/**
 * Normalize an audio fingerprint: identity (hash is already deterministic)
 */
export function normalizeAudioFp(value: string): string {
  return value.trim();
}

/**
 * Normalize a WebRTC local IP: strip port if present, trim
 */
export function normalizeWebrtcLocalIp(value: string): string {
  const trimmed = value.trim();
  // Only strip port from IPv4 addresses (exactly one colon, digits after it)
  // IPv6 addresses contain multiple colons and must not be modified
  const colonCount = (trimmed.match(/:/g) ?? []).length;
  if (colonCount === 1) {
    const colonIndex = trimmed.indexOf(':');
    const afterColon = trimmed.slice(colonIndex + 1);
    if (/^\d+$/.test(afterColon)) {
      return trimmed.slice(0, colonIndex);
    }
  }
  return trimmed;
}

/**
 * Normalize screen geometry: sort keys, JSON.stringify for consistency
 */
export function normalizeScreenGeometry(value: string): string {
  const trimmed = value.trim();
  try {
    const parsed = JSON.parse(trimmed);
    const sorted = Object.keys(parsed).sort().reduce<Record<string, unknown>>((acc, key) => {
      acc[key] = parsed[key];
      return acc;
    }, {});
    return JSON.stringify(sorted);
  } catch {
    // Already in "WxH:D:R" string format — normalize as-is
    return trimmed.toLowerCase();
  }
}

/**
 * Normalize timezone/locale: lowercase and trim
 */
export function normalizeTimezoneLocale(value: string): string {
  return value.trim().toLowerCase();
}

/**
 * Normalize font set: sort font names, join, lowercase
 */
export function normalizeFontSet(value: string): string {
  const trimmed = value.trim().toLowerCase();
  try {
    const fonts: string[] = JSON.parse(trimmed);
    return fonts.sort().join(',');
  } catch {
    // Already a comma-separated or hashed string
    return trimmed.split(',').map((f) => f.trim()).sort().join(',');
  }
}

/**
 * Normalize hardware profile: sort keys, JSON.stringify for consistency
 */
export function normalizeHardwareProfile(value: string): string {
  const trimmed = value.trim();
  try {
    const parsed = JSON.parse(trimmed);
    const sorted = Object.keys(parsed).sort().reduce<Record<string, unknown>>((acc, key) => {
      acc[key] = parsed[key];
      return acc;
    }, {});
    return JSON.stringify(sorted);
  } catch {
    // Already in "cores:mem:touch:mediaDevices" string format
    return trimmed.toLowerCase();
  }
}

/**
 * Normalize a typing cadence hash: identity (hash of timing pattern)
 */
export function normalizeTypingCadence(value: string): string {
  return value.trim();
}

/**
 * Normalize a mouse dynamics hash: identity (hash of movement pattern)
 */
export function normalizeMouseDynamics(value: string): string {
  return value.trim();
}