// Shared input validators for sign-up, profile, and inventory forms.

export const EMAIL_REGEX = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;

// Phone: allows digits, spaces, parens, +, -, . — must contain at least 7 digits.
export const PHONE_REGEX = /^\+?[\d\s().\-]{7,20}$/;

// CAS Registry Number: 2–7 digits, 2 digits, 1 check digit (e.g. 67-56-1).
export const CAS_REGEX = /^\d{2,7}-\d{2}-\d$/;

export function validateEmail(value: string): boolean {
  return EMAIL_REGEX.test(value.trim());
}

export function validatePhone(value: string): boolean {
  const trimmed = value.trim();
  if (!PHONE_REGEX.test(trimmed)) return false;
  // Require at least 7 actual digits to avoid strings of only punctuation.
  return trimmed.replace(/\D/g, '').length >= 7;
}

export function validatePhoneOrEmail(value: string): boolean {
  return validateEmail(value) || validatePhone(value);
}

export function validateCAS(value: string): boolean {
  return CAS_REGEX.test(value.trim());
}

export interface NumberOpts {
  min?: number;
  max?: number;
  integer?: boolean;
}

export function validateNumber(
  value: string | number | undefined | null,
  opts: NumberOpts = {},
): boolean {
  if (value == null || value === '') return false;
  const n = typeof value === 'number' ? value : Number(value);
  if (!Number.isFinite(n)) return false;
  if (opts.integer && !Number.isInteger(n)) return false;
  if (opts.min != null && n < opts.min) return false;
  if (opts.max != null && n > opts.max) return false;
  return true;
}