马达加斯加电话号码：格式、区号和验证指南

function preprocessMadagascarNumber(phoneNumber: string): string {
  // Remove all non-numeric characters. This handles variations in input formats.
  let cleaned = phoneNumber.replace(/\D/g, '');
  
  // Handle international prefix.  This normalizes international numbers.
  if (cleaned.startsWith('00261')) {
    cleaned = cleaned.slice(5);
  } else if (cleaned.startsWith('261')) {
    cleaned = cleaned.slice(3);
  }
  
  // Handle leading zero. This ensures consistency for domestic numbers.
  if (cleaned.startsWith('0')) {
    cleaned = cleaned.slice(1);
  }
  
  return cleaned;
}

// Example test case demonstrating the removal of non-numeric characters and international prefixes
console.log(preprocessMadagascarNumber("+261-32-1234-5678")); // Output: 3212345678
// Example test case demonstrating handling of numbers starting with '00261'
console.log(preprocessMadagascarNumber("002613212345678")); // Output: 3212345678

interface ValidationResult {
  valid: boolean;
  type?: 'FIXED_LINE' | 'MOBILE' | 'SPECIAL_SERVICES';
  error?: string;
}

const VALIDATION_PATTERNS = {
  fixedLine: /^20\d{6}$/,
  mobile: /^3[2-4,7-9]\d{7}$/,
  specialServices: /^30\d{6}$/
};

function validateMadagascarNumber(phoneNumber: string): ValidationResult {
  const processed = preprocessMadagascarNumber(phoneNumber);
  
  if (VALIDATION_PATTERNS.fixedLine.test(processed)) {
    return { valid: true, type: 'FIXED_LINE' };
  } else if (VALIDATION_PATTERNS.mobile.test(processed)) {
    return { valid: true, type: 'MOBILE' };
  } else if (VALIDATION_PATTERNS.specialServices.test(processed)) {
    return { valid: true, type: 'SPECIAL_SERVICES' };
  }
  
  return { valid: false, error: 'INVALID_FORMAT' };
}

// Example test case for a valid mobile number
console.log(validateMadagascarNumber("+2613212345678")); // Output: { valid: true, type: 'MOBILE' }
// Example test case for an invalid number format
console.log(validateMadagascarNumber("12345")); // Output: { valid: false, error: 'INVALID_FORMAT' }

// ... (Redis initialization and connection logic) ...

class ValidationCache {
  private cache: Redis; // Assuming 'Redis' is a pre-configured Redis client
  private readonly TTL = 24 * 60 * 60; // 24 hours - consider adjusting based on your needs

  async getCachedValidation(phoneNumber: string): Promise<ValidationResult> {
    const key = `validation:${phoneNumber}`;
    const cached = await this.cache.get(key);

    if (cached) {
      return JSON.parse(cached);
    }

    const result = await validateMadagascarNumber(phoneNumber);
    await this.cache.setex(key, this.TTL, JSON.stringify(result));

    return result;
  }


}