feat: improve quiz loading with rate limiting and enhanced error handling

[VassoD]

• Add rate limiting mechanism to prevent rapid API requests
• Implement comprehensive error handling for question loading
• Add isWaiting state to manage request throttling
• Enhance logging and error tracking during question retrieval
• Improve custom mode question selection logic
• Add more robust validation for API responses

[personal-pr-reviewer]

Code Review Summary

Review for src/hooks/useQuiz.ts:

Code Review

1. Positive Points:

• Rate Limiting: Implemented rate limiting using useRef and useState to prevent excessive API calls.
• Error Handling: Enhanced error handling with detailed logging and user-friendly error messages.
• Custom Mode Handling: Added support for custom mode questions, improving flexibility.
• State Management: Improved state management by resetting relevant states when toggling custom mode or changing difficulty.
• Code Organization: Better organization of the loadQuestion function with clear separation of concerns.

2. Key Suggestions:

• Avoid Commented-Out Code: Remove commented-out code for better readability and maintenance.
• Consistent Error Handling: Ensure consistent error handling across all async operations.
• Avoid Console Logs: Replace console.log and console.error with a proper logging mechanism for production.
• Optimize State Updates: Minimize state updates to avoid unnecessary re-renders.
• Type Safety: Ensure all variables and states have explicit types for better type safety.

3. Code Example:

+      const requestBody = {
+        topic: selectedTopic,
+        difficulty: state.difficulty,
+        // excludePatterns,
+      };
+
+      console.log("Sending request with:", requestBody);

Replace with:

      const requestBody: RequestBodyType = {
        topic: selectedTopic,
        difficulty: state.difficulty,
        // excludePatterns,
      };

      logger.info("Sending request with:", requestBody);

4. Summary:

The changes introduce rate limiting, enhanced error handling, and improved state management, especially for custom mode, but there are opportunities to improve code readability, error handling consistency, and type safety.

---

[personal-pr-reviewer]

Code Review for Latest Changes

Reviewing commits: 9aabbf6

Review for src/components/QuizApp.tsx:

Review for changes in src/components/QuizApp.tsx

1. Positive points:

   • The addition of the isWaiting state and its integration into the LoadingCard component improves user experience by providing more specific feedback during loading states.
   • The code maintains a clear and readable structure, making it easy to understand the flow of conditions.

2. Key suggestions:

   • Potential Null/Undefined Issue: Ensure that isWaiting is always defined when loading is true to avoid potential runtime errors.
   • Consistent Formatting: Consider using consistent formatting for the conditional return statements to improve readability.
   • Accessibility: Ensure that the LoadingCard component handles dynamic messages in an accessible manner, such as announcing the message to screen readers.
   • Performance Consideration: If isWaiting involves complex logic or additional state changes, consider memoizing its value to avoid unnecessary re-renders.

3. Code example:

   if (loading)
     return (
       <LoadingCard

•    message={isWaiting ? "Please wait a moment..." : "Loading..."}
  

•    message={isWaiting ?? false ? "Please wait a moment..." : "Loading..."}
   />
  

  );

4. Summary:
   The changes introduce a more informative loading message based on the isWaiting state, enhancing the user experience during loading phases.

---

[personal-pr-reviewer]

Code Review for Latest Changes

Reviewing commits: 7881b75

Review for src/components/quiz/LoadingCard.tsx:

Code Review

1. Positive points:

   • Props for Customization: Introduced LoadingCardProps interface to allow customization of the loading message.
   • Default Prop Value: Provided a default value for the message prop, ensuring the component has a fallback.
   • Simplified Structure: Removed unnecessary imports and simplified the component structure.
   • Styling: Improved styling with more descriptive classes and added animation for a better user experience.

2. Key suggestions:

   • Accessibility: Ensure the loading message is accessible. Consider using a semantic HTML element or ARIA roles.
   • Consistency: Maintain consistency in class names and structure with other components in the project.
   • Type Safety: Although the interface is a good addition, consider adding more prop types if needed in the future for better type safety.
   • Performance: The animate-pulse class might cause performance issues if overused. Ensure it's necessary and test performance.

3. Code example:

   export const LoadingCard = ({ message = "Loading..." }: LoadingCardProps) => {
     return (
       <div className="w-full max-w-2xl mx-auto mt-8 p-6 bg-card rounded-xl shadow-lg animate-pulse" role="status">
         <div className="flex items-center justify-center">
           <p className="text-lg text-muted-foreground">{message}</p>
         </div>
       </div>
     );
   };

4. Summary:
   The changes refactor the LoadingCard component to accept a customizable loading message, improve styling, and simplify the component structure.

---

[personal-pr-reviewer]

Code Review for Latest Changes

Reviewing commits: 58934b3, d5e2724, 1a83949, 9a5e614, f8dd1f6

Review for src/app/api/quiz/prompt.ts:

Positive Aspects

1. Clear Guidelines: The addition of specific guidelines for code-based answers improves clarity and consistency.
2. Proper Formatting: The use of backticks for code formatting in options ensures better readability and accuracy.
3. Detailed Examples: Providing examples for both correct and incorrect formats helps users understand the requirements better.

Suggestions

1. Consistency: Ensure that the examples for text-based answers are also updated to reflect the new guidelines, maintaining consistency throughout the documentation.
2. Conciseness: Consider consolidating the examples into a single section to avoid redundancy and make the documentation more concise.
3. Error Handling: Add a brief note on how to handle edge cases or errors in the prompts to make the function more robust.

One-Line Summary

The changes enhance clarity and formatting for code-based answers but could benefit from consolidation and additional error handling notes.

---

Review for src/components/quiz/AnswerOptions.tsx:

Positive Aspects

1. Code Formatting and Syntax Highlighting: The addition of syntax highlighting for code snippets within answer options enhances readability and user experience.
2. Memoization: The use of useMemo for rendering option content optimizes performance by avoiding unnecessary re-renders.

Suggestions

1. DRY Principle: The getButtonVariant and getButtonClassName functions have overlapping logic. Consider refactoring to reduce redundancy.
2. Accessibility: Ensure that the Button component is accessible, especially when disabled. Add aria labels or roles if necessary.

Summary

The changes improve user experience and performance but could benefit from refactoring to reduce redundancy and ensure accessibility.

---

Review for src/components/quiz/FeedbackSection.tsx:

Positive Aspects

1. Memoization: Good use of memo to optimize performance by preventing unnecessary re-renders of the FeedbackIcon and ExplanationSection components.
2. Componentization: Breaking down the FeedbackSection into smaller components (FeedbackIcon and ExplanationSection) improves code readability and maintainability.
3. Conditional Rendering: Clear and effective use of conditional rendering to display the "Pro Tip" section only when the selected answer is incorrect.

Suggestions

1. TypeScript Types: Ensure that currentQuestion is properly typed to avoid potential runtime errors. Consider adding null checks or default values.
2. Code Duplication: The feedback classes string can be simplified or moved to a utility function to reduce duplication and improve readability.
3. Accessibility: Consider adding aria-labels or roles to improve the accessibility of the feedback icons and buttons.

Summary

The changes improve performance and maintainability but could benefit from better typing and accessibility considerations.

---

Review for src/hooks/useQuiz.ts:

Positive Aspects

1. Rate Limiting: The addition of rate limiting using useRef and useState to prevent excessive API requests is a good practice for improving performance and reducing server load.
2. Error Handling: Enhanced error handling with specific checks for valid topics and difficulties improves the robustness of the code.

Suggestions

1. Code Duplication: The logic for checking rate limiting and waiting could be abstracted into a separate function to reduce duplication and improve readability.
2. Consistent Error Messages: Ensure that error messages are consistent and provide clear information for debugging purposes.

Summary

The changes introduce important improvements like rate limiting and better error handling, but could benefit from further refactoring to reduce code duplication.

---

[personal-pr-reviewer]

Code Review for Latest Changes

Reviewing commits: fddbca4

Review for src/components/quiz/QuestionCard.tsx:

Positive Aspects

1. Memoization: The use of memo and useMemo improves performance by preventing unnecessary re-renders and recalculations.
2. Component Extraction: Extracting QuestionHeader and CodeDisplay into separate components enhances code readability and reusability.

Suggestions

1. Remove Unused Imports: The import statement for useEffect is no longer needed and should be removed.
2. TypeScript Types: Consider adding TypeScript types for the code prop in the CodeDisplay component to ensure type safety.

Summary

The changes improve performance and readability, but minor adjustments like removing unused imports and adding TypeScript types could further enhance the code quality.

---