refactoring-advisor

# Refactoring Advisor

## Quick Start

Plan refactoring based on identified issues:

1. Identify the problem (code smell, complexity)
2. Select appropriate refactoring pattern
3. Create step-by-step plan
4. Ensure tests exist
5. Refactor incrementally

## Instructions

### Step 1: Assess Current State

Analyze the code:
- What is the problem? (long method, god class, etc.)
- What is the impact? (maintainability, testability)
- What is the risk? (how much code depends on it)

### Step 2: Select Refactoring Strategy

| Problem | Strategy | Risk |
|---------|----------|------|
| Long Method | Extract Method | Low |
| God Class | Extract Class | Medium |
| Duplicated Code | Extract Method | Low |
| Switch Statement | Replace with Polymorphism | High |
| Long Parameter List | Introduce Parameter Object | Medium |

### Step 3: Create Refactoring Plan

**Template:**
```markdown
## Refactoring: [Name]

**Problem:** [Description]
**Goal:** [Desired outcome]
**Risk Level:** [Low/Medium/High]

### Prerequisites
- [ ] Tests exist and pass
- [ ] Code is committed
- [ ] Dependencies identified

### Steps
1. [First small change]
2. [Run tests]
3. [Next small change]
4. [Run tests]
...

### Validation
- [ ] All tests pass
- [ ] No functionality changed
- [ ] Code is cleaner
```

### Step 4: Execute Incrementally

**Golden Rule:** Make the change easy, then make the easy change

1. Make one small change
2. Run tests
3. Commit
4. Repeat

## Refactoring Examples

### Extract Method

**Before:**
```javascript
function printOwing(invoice) {
  let outstanding = 0;
  
  console.log("***********************");
  console.log("**** Customer Owes ****");
  console.log("***********************");
  
  for (const o of invoice.orders) {
    outstanding += o.amount;
  }
  
  console.log(`name: ${invoice.customer}`);
  console.log(`amount: ${outstanding}`);
}
```

**Plan:**
1. Extract banner printing
2. Run tests
3. Extract outstanding calculation
4. Run tests
5. Extract details printing
6. Run te