# Button Component Design & Architecture
**Component**: Button  
**Priority**: HIGH  
**Status**: Needs File Size Refactoring

## 📊 Current State Analysis

### **File Structure**
```
packages/leptos/button/src/
├── default.rs (170 lines) ✅
├── implementation_tests.rs (527 lines) ❌ VIOLATION
├── lib.rs (33 lines) ✅
├── new_york_tests.rs (638 lines) ❌ VIOLATION
├── new_york.rs (142 lines) ✅
├── property_tests.rs (334 lines) ❌ VIOLATION
├── signal_managed.rs (391 lines) ❌ VIOLATION
├── standardized.rs (569 lines) ❌ VIOLATION
├── test_helpers.rs (52 lines) ✅
├── test_templates.rs (167 lines) ✅
├── tests_legacy.rs (843 lines) ❌ VIOLATION
├── tests_simple.rs (229 lines) ✅
└── variant_comparison_tests.rs (374 lines) ❌ VIOLATION
```

### **Test Coverage Status**
- **Total Tests**: 115 tests passing ✅
- **Coverage Quality**: Excellent ✅
- **Test Organization**: Needs refactoring ❌

### **File Size Violations**
| File | Lines | Limit | Status |
|------|-------|-------|---------|
| `implementation_tests.rs` | 527 | 300 | ❌ **VIOLATION** |
| `new_york_tests.rs` | 638 | 300 | ❌ **VIOLATION** |
| `tests_legacy.rs` | 843 | 300 | ❌ **VIOLATION** |
| `property_tests.rs` | 334 | 300 | ❌ **VIOLATION** |
| `signal_managed.rs` | 391 | 300 | ❌ **VIOLATION** |
| `standardized.rs` | 569 | 300 | ❌ **VIOLATION** |
| `variant_comparison_tests.rs` | 374 | 300 | ❌ **VIOLATION** |

---

## 🎯 Design Goals

### **Primary Objectives**
1. **File Size Compliance**: All files under 300 lines
2. **Test Organization**: Logical grouping of tests
3. **Maintainability**: Easy to understand and modify
4. **Performance**: Optimized for production use

### **Secondary Objectives**
1. **Documentation**: Comprehensive component documentation
2. **Accessibility**: Full ARIA and keyboard support
3. **Theming**: Support for multiple design systems
4. **Integration**: Seamless integration with other components

---

## 🏗️ Proposed Architecture

### **Refactored File Structure**
```
packages/leptos/button/src/
├── lib.rs (50 lines) ✅
├── default.rs (170 lines) ✅
├── new_york.rs (142 lines) ✅
├── signal_managed.rs (200 lines) ✅
├── standardized.rs (200 lines) ✅
├── test_helpers.rs (52 lines) ✅
├── tests/
│   ├── mod.rs (20 lines) ✅
│   ├── basic_rendering_tests.rs (250 lines) ✅
│   ├── interaction_tests.rs (250 lines) ✅
│   ├── accessibility_tests.rs (250 lines) ✅
│   ├── theme_tests.rs (250 lines) ✅
│   ├── performance_tests.rs (250 lines) ✅
│   ├── integration_tests.rs (250 lines) ✅
│   └── property_tests.rs (250 lines) ✅
└── legacy/
    ├── tests_legacy.rs (200 lines) ✅
    └── variant_comparison_tests.rs (200 lines) ✅
```

### **Module Responsibilities**

#### **Core Modules**
- **`lib.rs`**: Main exports and module organization
- **`default.rs`**: Default theme implementation
- **`new_york.rs`**: New York theme implementation
- **`signal_managed.rs`**: Signal management features
- **`standardized.rs`**: API standardization

#### **Test Modules**
- **`basic_rendering_tests.rs`**: Basic rendering and props
- **`interaction_tests.rs`**: Click handlers and events
- **`accessibility_tests.rs`**: ARIA attributes and keyboard navigation
- **`theme_tests.rs`**: Theme variant testing
- **`performance_tests.rs`**: Performance and optimization tests
- **`integration_tests.rs`**: Integration with other components
- **`property_tests.rs`**: Property-based testing

#### **Legacy Modules**
- **`tests_legacy.rs`**: Legacy test compatibility
- **`variant_comparison_tests.rs`**: Theme variant comparisons

---

## 🛠️ Implementation Plan

### **Phase 1: File Size Refactoring (Week 1)**
**Priority: CRITICAL**

#### **Step 1: Split Large Test Files**
- [ ] Split `implementation_tests.rs` (527 lines) → 3 modules
- [ ] Split `new_york_tests.rs` (638 lines) → 4 modules
- [ ] Split `tests_legacy.rs` (843 lines) → 6 modules
- [ ] Split `property_tests.rs` (334 lines) → 2 modules

#### **Step 2: Refactor Core Files**
- [ ] Split `signal_managed.rs` (391 lines) → 2 modules
- [ ] Split `standardized.rs` (569 lines) → 3 modules
- [ ] Split `variant_comparison_tests.rs` (374 lines) → 2 modules

#### **Step 3: Create Test Module Structure**
- [ ] Create `tests/` directory
- [ ] Implement focused test modules
- [ ] Organize tests by functionality
- [ ] Maintain test coverage

### **Phase 2: Test Enhancement (Week 2)**
**Priority: HIGH**

#### **Step 1: Accessibility Testing**
- [ ] Implement comprehensive ARIA tests
- [ ] Add keyboard navigation tests
- [ ] Create screen reader compatibility tests
- [ ] Test focus management

#### **Step 2: Performance Testing**
- [ ] Add rendering performance tests
- [ ] Implement memory usage tests
- [ ] Create stress testing scenarios
- [ ] Test optimization features

#### **Step 3: Integration Testing**
- [ ] Test with other components
- [ ] Create complex usage scenarios
- [ ] Test theme switching
- [ ] Validate API contracts

### **Phase 3: Documentation (Week 3)**
**Priority: MEDIUM**

#### **Step 1: Component Documentation**
- [ ] Create comprehensive API documentation
- [ ] Add usage examples
- [ ] Document accessibility features
- [ ] Create migration guides

#### **Step 2: Test Documentation**
- [ ] Document test organization
- [ ] Create testing guidelines
- [ ] Add performance benchmarks
- [ ] Document best practices

---

## 📊 Success Metrics

### **File Size Compliance**
- **Target**: All files under 300 lines
- **Current**: 7 violations
- **Goal**: 0 violations

### **Test Coverage**
- **Current**: 115 tests passing
- **Target**: 150+ tests
- **Goal**: 100% coverage

### **Performance Metrics**
- **Rendering Time**: < 5ms
- **Memory Usage**: < 1MB
- **Bundle Size**: < 50KB

### **Accessibility Compliance**
- **WCAG 2.1 AA**: 100% compliance
- **Keyboard Navigation**: Full support
- **Screen Reader**: Full compatibility

---

## 🚀 Implementation Timeline

### **Week 1: File Size Refactoring**
- **Days 1-2**: Split large test files
- **Days 3-4**: Refactor core files
- **Days 5-7**: Create test module structure

### **Week 2: Test Enhancement**
- **Days 1-2**: Accessibility testing
- **Days 3-4**: Performance testing
- **Days 5-7**: Integration testing

### **Week 3: Documentation**
- **Days 1-2**: Component documentation
- **Days 3-4**: Test documentation
- **Days 5-7**: Review and optimization

---

## 🎯 Quality Gates

### **Week 1 Gates**
- [ ] All files under 300 lines
- [ ] All tests passing
- [ ] No compilation errors

### **Week 2 Gates**
- [ ] 150+ tests implemented
- [ ] Performance benchmarks met
- [ ] Accessibility compliance

### **Week 3 Gates**
- [ ] Documentation complete
- [ ] Migration guides ready
- [ ] Production-ready status

---

## 💡 Technical Considerations

### **Refactoring Strategy**
- **Incremental Changes**: Small, testable modifications
- **Test Preservation**: Maintain all existing tests
- **Backward Compatibility**: Ensure API stability
- **Performance**: No performance degradation

### **Risk Mitigation**
- **Git Branches**: Separate branch for each phase
- **Code Reviews**: Peer review for all changes
- **Rollback Plans**: Ability to revert changes
- **Testing**: Comprehensive test coverage

### **Quality Assurance**
- **Automated Testing**: CI/CD pipeline integration
- **Performance Monitoring**: Continuous performance tracking
- **Accessibility Testing**: Automated accessibility checks
- **Documentation**: Automated documentation generation

---

*Button Component Design created: September 20, 2025*  
*Next review: October 20, 2025*