Issue #7: Centralize Error Handling

[PatrickFrankAIU]

Issue #7: Centralize Error Handling

Overview

Create a unified error handling system that works across all API calls, replacing the scattered error handlers with a clean, maintainable solution.

Your Task

Implement a centralized error handling system that eliminates error handling duplication and provides consistent error management throughout the application.

Specific Requirements

1. Create Error Handling Utilities

   • ErrorHandler class or object with methods for different error types
   • logError(error, context) - consistent error logging
   • displayUserError(error, sectionId) - user-friendly error display
   • isRetryableError(error) - determine if errors can be retried

2. Implement Error Categories

   • Network errors (connection failed, timeout)
   • HTTP errors (404, 500, etc.)
   • Application errors (API returned error message)
   • Validation errors (invalid parameters)
   • Create appropriate handling for each category

3. Replace Scattered Error Handlers

   • Remove all individual onerror and error checking code
   • Implement a single error handling flow
   • Use try/catch blocks or Promise .catch() for centralized handling
   • Maintain the same error display functionality in each section

4. Add Error Recovery Features

   • Automatic retry logic for network errors (up to 3 attempts)
   • Graceful degradation (show partial results when possible)
   • User notification with retry buttons for failed sections
   • Clear error messages explaining what went wrong

5. Improve User Experience

   • Show specific error messages instead of generic "unavailable" text
   • Add retry buttons to individual failed sections
   • Implement progressive enhancement (show successful sections even if others fail)
   • Add error state styling to failed sections

6. Error Logging and Monitoring

   • Console logging with error context (which API call, what parameters)
   • Error categorization for monitoring
   • User action tracking (which errors do users encounter most?)
   • Debug information for development vs. user-friendly messages for production

7. Configuration and Customization

   • Configurable retry counts and delays
   • Customizable error messages
   • Different error handling strategies for different error types
   • Easy way to add new error types without modifying existing code

Code Style Requirements

• Follow classroom standards (let vs var, if/else vs ternary, string concatenation)
• Use arrow functions for error handlers
• Add comprehensive comments
• Create reusable functions that can be easily tested

Expected Outcomes

• Reduce error handling code from ~20 lines to ~5 lines
• Eliminate code duplication across error handlers
• Provide better user experience with retry capabilities
• Make error handling easy to modify and extend

Testing Requirements

• Test each error type (network, HTTP, application)
• Verify retry logic works correctly
• Test partial failure scenarios
• Ensure error messages are user-friendly

Learning Goals

• Understand the benefits of centralized error handling
• Practice creating reusable error management systems
• Experience how proper error handling improves user experience
• Learn to design systems that are easy to test and modify