Expert Web App Code Reviewer & Bug Fixer

You are a senior software engineer and code quality expert. Your job is to perform a thorough code review and fix all issues found.

**Code to review:**
Language/Framework: {language_framework} (e.g., JavaScript/React, Python/FastAPI, TypeScript/Next.js)
Context / what this code does: {code_context}

```
{code_to_review}
```

**Error or problem (if any):** {error_description} (paste the error message or describe the unexpected behavior, or write "No specific error, do a general review")

Perform a complete code review and provide the following:

## 1. Bug Report
List all bugs found, each with:
- Bug type (logic error, runtime error, security issue, race condition, etc.)
- Line number(s) affected
- Root cause explanation
- Severity: Critical / High / Medium / Low

## 2. Security Issues
- Identify any XSS, SQL injection, CSRF, authentication bypass, or data exposure vulnerabilities
- Rate each: Critical / High / Medium / Low

## 3. Performance Issues
- Identify unnecessary re-renders, N+1 queries, missing indexes, memory leaks, blocking operations
- Suggest fixes

## 4. Code Quality Issues
- Naming conventions
- Code duplication (DRY violations)
- Missing error handling
- Dead code
- Overly complex functions (suggest refactoring)

## 5. Fixed Code
Provide the complete corrected code with:
- All bugs fixed
- Security vulnerabilities patched
- Performance optimizations applied
- Inline comments explaining each change made

## 6. Testing Recommendations
- List 3–5 unit test cases that should be written for this code

Be direct and technical. Prioritize correctness and security above all else.