import { describe, test, expect } from 'bun:test';
import { normalizeWhatsAppId, isGroupId } from '../../../src/utils/whatsapp';

describe('WhatsApp Utilities', () => {

  describe('normalizeWhatsAppId', () => {
    test('should normalize standard user JID', () => {
      expect(normalizeWhatsAppId('1234567890@s.whatsapp.net')).toBe('1234567890');
    });

    test('should normalize group JID', () => {
      expect(normalizeWhatsAppId('1234567890-1234567890@g.us')).toBe('1234567890-1234567890');
    });

    test('should normalize user JID with participant ID', () => {
      expect(normalizeWhatsAppId('1234567890:12@s.whatsapp.net')).toBe('1234567890');
    });
    
    test('should normalize group JID with participant ID (less common but possible)', () => {
      expect(normalizeWhatsAppId('1234567890-9876543210:5@g.us')).toBe('1234567890-9876543210');
    });

    test('should normalize status broadcast JID', () => {
      expect(normalizeWhatsAppId('status_me@broadcast')).toBe('status_me');
    });

    test('should handle JID without domain', () => {
      expect(normalizeWhatsAppId('1234567890')).toBe('1234567890');
    });
    
    test('should handle group JID without domain', () => {
      expect(normalizeWhatsAppId('1234567890-9876543210')).toBe('1234567890-9876543210');
    });

    test('should return null for null input', () => {
      expect(normalizeWhatsAppId(null)).toBeNull();
    });

    test('should return null for undefined input', () => {
      expect(normalizeWhatsAppId(undefined)).toBeNull();
    });

    test('should return null for empty string input', () => {
      expect(normalizeWhatsAppId('')).toBeNull();
    });

    test('should return null for invalid characters after normalization', () => {
      // Example: JID containing characters not allowed after stripping domain/participant
      expect(normalizeWhatsAppId('invalid!char@s.whatsapp.net')).toBeNull();
      expect(normalizeWhatsAppId('123 456@s.whatsapp.net')).toBeNull(); // Contains space
    });
    
    test('should return null for JID that becomes empty after normalization', () => {
      expect(normalizeWhatsAppId('@s.whatsapp.net')).toBeNull();
      expect(normalizeWhatsAppId(':12@s.whatsapp.net')).toBeNull();
    });
  });

  describe('isGroupId', () => {
    test('should return true for valid group JID', () => {
      expect(isGroupId('1234567890-1234567890@g.us')).toBe(true);
    });

    test('should return false for user JID', () => {
      expect(isGroupId('1234567890@s.whatsapp.net')).toBe(false);
    });
    
    test('should return false for group JID without domain', () => {
      expect(isGroupId('1234567890-1234567890')).toBe(false);
    });

    test('should return false for null input', () => {
      expect(isGroupId(null)).toBe(false);
    });

    test('should return false for undefined input', () => {
      expect(isGroupId(undefined)).toBe(false);
    });

    test('should return false for empty string input', () => {
      expect(isGroupId('')).toBe(false);
    });
  });

});
