Long Method
- Methods exceeding 20-30 lines
- Multiple responsibilities in single method
- Difficult to test and understand
- Fix: Extract smaller, focused methods with single responsibilities
Large Class (God Object)
- Too many responsibilities in one class
- High number of instance variables
- Violates Single Responsibility Principle
- Fix: Split into smaller, cohesive classes
Duplicate Code
- Copy-pasted logic across methods
- Similar patterns with slight variations
- Fix: Extract common logic into reusable methods
Feature Envy
- Methods that use data from other classes more than their own
- Excessive getter/setter calls to another object
- Fix: Move method to the class it's most interested in

📋 Refactoring Plan

Phase 1: Name Refactoring (No Behavior Changes)

Identify all poorly named variables, methods, and fields
Map current names to descriptive alternatives
Ensure naming follows language conventions:
- Java/JavaScript: camelCase for methods/variables, PascalCase for classes
- Python: snake_case for functions/variables, PascalCase for classes
Update all references throughout codebase
Run tests to ensure no behavioral changes

Phase 2: Structure Improvements

Address long methods by identifying extraction points
Plan class decomposition for God Objects
Identify duplicate code patterns for consolidation
Map feature envy methods to their proper homes

Phase 3: Implementation Order

Start with naming - Low risk, high readability impact
Extract methods - Reduce complexity incrementally
Remove duplication - Create reusable components
Reorganize classes - Move methods to appropriate classes
Split large classes - Final structural improvements

🎯 Success Criteria

All tests pass after each refactoring step
Code coverage remains the same or improves
Cyclomatic complexity reduced
Improved readability scores
No behavioral changes introduced

⚠️ Risk Mitigation

Create comprehensive test suite before refactoring
Use version control for easy rollback
Refactor in small, reviewable commits
Document all name mappings
Review with team before major structural changes

Example Name Refactorings

// Before
getData() → fetchCustomerPurchaseHistory()
processItems() → calculateMonthlyRevenue()
userObj → customerProfile
temp → filteredTransactions
data → invoiceRecords
doStuff() → validatePaymentCredentials()

Next Steps

Review the identified code smells
Prioritize based on impact and risk
Begin with Phase 1 naming refactors
Proceed incrementally through the plan
Measure improvements after each phase

refactor:smells

Usage

Analysis Output

📊 Code Smell Analysis for: $ARGUMENTS

🔍 Top 5 Code Smells Detected: