/**
 * Tests for Error Message Utilities
 */

import {
  getErrorMessage,
  getActionHint,
  validateEmail,
  validatePhone,
  validateRequired,
  validateMinLength,
  validateMaxLength,
  validateOtp,
  formatErrorMessage,
  combineFieldErrors,
  getErrorCountText,
  ErrorMessages,
} from '@/utils/errorMessages';
import { ErrorCodes } from '@/types/errors';

describe('errorMessages', () => {
  describe('getErrorMessage', () => {
    it('should return network error message', () => {
      const message = getErrorMessage(ErrorCodes.NETWORK_ERROR);
      expect(message).toBe(ErrorMessages.networkError);
    });

    it('should return session expired message for unauthorized', () => {
      const message = getErrorMessage(ErrorCodes.UNAUTHORIZED);
      expect(message).toBe(ErrorMessages.sessionExpired);
    });

    it('should return fallback for unknown code', () => {
      const message = getErrorMessage('UNKNOWN_CODE', 'Custom fallback');
      expect(message).toBe('Custom fallback');
    });

    it('should return generic error for unknown code without fallback', () => {
      const message = getErrorMessage('UNKNOWN_CODE');
      expect(message).toBe(ErrorMessages.genericError);
    });
  });

  describe('getActionHint', () => {
    it('should return hint for network error', () => {
      const hint = getActionHint(ErrorCodes.NETWORK_ERROR);
      expect(hint).toContain('connection');
    });

    it('should return hint for BLE error', () => {
      const hint = getActionHint(ErrorCodes.BLE_NOT_ENABLED);
      expect(hint).toContain('Bluetooth');
    });

    it('should return undefined for code without hint', () => {
      const hint = getActionHint('UNKNOWN_CODE');
      expect(hint).toBeUndefined();
    });
  });

  describe('validateEmail', () => {
    it('should return null for valid email', () => {
      expect(validateEmail('test@example.com')).toBeNull();
      expect(validateEmail('user.name@domain.co.uk')).toBeNull();
      expect(validateEmail('user+tag@example.org')).toBeNull();
    });

    it('should return error for empty email', () => {
      expect(validateEmail('')).toBe(ErrorMessages.required);
      expect(validateEmail('   ')).toBe(ErrorMessages.required);
    });

    it('should return error for invalid email', () => {
      expect(validateEmail('notanemail')).toBe(ErrorMessages.invalidEmail);
      expect(validateEmail('missing@domain')).toBe(ErrorMessages.invalidEmail);
      expect(validateEmail('@nodomain.com')).toBe(ErrorMessages.invalidEmail);
      expect(validateEmail('spaces in@email.com')).toBe(ErrorMessages.invalidEmail);
    });
  });

  describe('validatePhone', () => {
    it('should return null for valid phone numbers', () => {
      expect(validatePhone('+14155551234')).toBeNull();
      expect(validatePhone('14155551234')).toBeNull();
      expect(validatePhone('+7 (999) 123-45-67')).toBeNull();
      expect(validatePhone('999.123.4567')).toBeNull();
    });

    it('should return null for empty phone (optional)', () => {
      expect(validatePhone('')).toBeNull();
      expect(validatePhone('   ')).toBeNull();
    });

    it('should return error for invalid phone', () => {
      expect(validatePhone('123')).toBe(ErrorMessages.invalidPhone);
      expect(validatePhone('abcdefghij')).toBe(ErrorMessages.invalidPhone);
    });
  });

  describe('validateRequired', () => {
    it('should return null for non-empty value', () => {
      expect(validateRequired('test')).toBeNull();
      expect(validateRequired('  test  ')).toBeNull();
    });

    it('should return error for empty value', () => {
      expect(validateRequired('')).toBe(ErrorMessages.required);
      expect(validateRequired('   ')).toBe(ErrorMessages.required);
      expect(validateRequired(null)).toBe(ErrorMessages.required);
      expect(validateRequired(undefined)).toBe(ErrorMessages.required);
    });

    it('should include field name in error when provided', () => {
      const error = validateRequired('', 'Email');
      expect(error).toBe('Email is required.');
    });
  });

  describe('validateMinLength', () => {
    it('should return null when value meets minimum', () => {
      expect(validateMinLength('abc', 3)).toBeNull();
      expect(validateMinLength('abcde', 3)).toBeNull();
    });

    it('should return error when value is too short', () => {
      expect(validateMinLength('ab', 3)).toBe(ErrorMessages.tooShort(3));
      expect(validateMinLength('', 1)).toBe(ErrorMessages.tooShort(1));
    });
  });

  describe('validateMaxLength', () => {
    it('should return null when value meets maximum', () => {
      expect(validateMaxLength('abc', 3)).toBeNull();
      expect(validateMaxLength('ab', 3)).toBeNull();
    });

    it('should return error when value is too long', () => {
      expect(validateMaxLength('abcd', 3)).toBe(ErrorMessages.tooLong(3));
    });
  });

  describe('validateOtp', () => {
    it('should return null for valid OTP', () => {
      expect(validateOtp('123456')).toBeNull();
      expect(validateOtp('000000')).toBeNull();
    });

    it('should return error for empty OTP', () => {
      expect(validateOtp('')).toBe(ErrorMessages.required);
      expect(validateOtp('   ')).toBe(ErrorMessages.required);
    });

    it('should return error for invalid OTP', () => {
      expect(validateOtp('12345')).toBe(ErrorMessages.invalidOtp); // Too short
      expect(validateOtp('1234567')).toBe(ErrorMessages.invalidOtp); // Too long
      expect(validateOtp('12345a')).toBe(ErrorMessages.invalidOtp); // Contains letter
      expect(validateOtp('12 345')).toBe(ErrorMessages.invalidOtp); // Contains space
    });

    it('should respect custom length', () => {
      expect(validateOtp('1234', 4)).toBeNull();
      expect(validateOtp('123456', 4)).toBe(ErrorMessages.invalidOtp);
    });
  });

  describe('formatErrorMessage', () => {
    it('should capitalize first letter', () => {
      expect(formatErrorMessage('error message')).toBe('Error message.');
    });

    it('should add period if missing', () => {
      expect(formatErrorMessage('Error message')).toBe('Error message.');
    });

    it('should not add period if already ends with punctuation', () => {
      expect(formatErrorMessage('Error message.')).toBe('Error message.');
      expect(formatErrorMessage('Error message!')).toBe('Error message!');
      expect(formatErrorMessage('Error message?')).toBe('Error message?');
    });

    it('should return generic error for empty input', () => {
      expect(formatErrorMessage('')).toBe(ErrorMessages.genericError);
    });

    it('should trim whitespace', () => {
      expect(formatErrorMessage('  error  ')).toBe('Error.');
    });
  });

  describe('combineFieldErrors', () => {
    it('should return empty string for no errors', () => {
      expect(combineFieldErrors([])).toBe('');
    });

    it('should return single message for one error', () => {
      const errors = [{ field: 'email', message: 'Invalid email' }];
      expect(combineFieldErrors(errors)).toBe('Invalid email');
    });

    it('should combine multiple errors', () => {
      const errors = [
        { field: 'email', message: 'Invalid email' },
        { field: 'phone', message: 'Invalid phone' },
      ];
      const result = combineFieldErrors(errors);
      expect(result).toContain('2 errors');
      expect(result).toContain('Invalid email');
      expect(result).toContain('Invalid phone');
    });
  });

  describe('getErrorCountText', () => {
    it('should return "No errors" for 0', () => {
      expect(getErrorCountText(0)).toBe('No errors');
    });

    it('should return "1 error" for 1', () => {
      expect(getErrorCountText(1)).toBe('1 error');
    });

    it('should return plural for multiple errors', () => {
      expect(getErrorCountText(2)).toBe('2 errors');
      expect(getErrorCountText(5)).toBe('5 errors');
    });
  });
});