Fix #22: Add comprehensive error handling and input validation

[1234-ad]

Overview

This PR addresses issue #22 by implementing comprehensive error handling and input validation across the codebase.

Changes Made

1. Enhanced Supabase Client (src/supabaseClient.js)

• ✅ Added environment variable validation
• ✅ Added URL format validation
• ✅ Created handleSupabaseError helper function
• ✅ Improved error messages with context

2. Validation Utilities (src/utils/validators.js)

• ✅ validateRequired - Checks for null/undefined values
• ✅ validateNonEmptyString - Validates non-empty strings
• ✅ validateEmail - Email format validation
• ✅ validatePositiveNumber - Positive number validation
• ✅ validateNonEmptyArray - Array validation
• ✅ safeAsync - Async error handling wrapper

3. Error Handler (src/utils/errorHandler.js)

• ✅ Custom AppError class with error types
• ✅ Centralized error logging with logError
• ✅ User-friendly error messages with getUserFriendlyMessage
• ✅ Error boundary wrapper for async operations
• ✅ Error categorization (VALIDATION, NETWORK, AUTH, DATABASE, UNKNOWN)

Technical Benefits

• 🛡️ Improved Stability: Prevents runtime errors from invalid inputs
• 🐛 Better Debugging: Detailed error logging with context
• 👥 Enhanced UX: User-friendly error messages
• 🔧 Maintainability: Reusable validation and error handling utilities
• 📊 Error Tracking Ready: Structured for integration with error tracking services

Usage Examples

// Using validators
import { validateEmail, validateNonEmptyString } from './utils/validators';

try {
  validateEmail(userEmail);
  validateNonEmptyString(userName, 'Username');
} catch (error) {
  console.error(error.message);
}

// Using error handler
import { AppError, ErrorTypes, logError } from './utils/errorHandler';

throw new AppError('Invalid credentials', ErrorTypes.AUTH);

Testing

• ✅ Environment variable validation tested
• ✅ All validator functions tested with edge cases
• ✅ Error handling utilities verified

Closes #22

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