# Heat Bracket API Implementation Checklist

## ✅ Completed

### API Infrastructure
- [x] Created `api/heat_bracket_view_api.php` - Central API endpoint
- [x] Created `api/heat_bracket_compact.php` - Compact template for judge view
- [x] Implemented bracket level building algorithm
- [x] Connection generation from flow_source_heat
- [x] JSON response format with HTML + connections
- [x] Error handling and validation

### Judge Interface Integration  
- [x] Updated `loadHeatFlowPreview()` to call API instead of client-side generation
- [x] Updated `drawBracketConnections()` to work with API-generated HTML
- [x] Updated `showHeatDetail()` to use `window.heatBracketData` structure
- [x] Removed template literals (replaced with string concatenation)
- [x] Fixed participant data access from new data structure

### Testing & Documentation
- [x] Created `test_heat_bracket_api.php` - Visual test interface
- [x] Created `HEAT_BRACKET_API.md` - Complete API documentation
- [x] Documented data structures and algorithms
- [x] Added usage examples and integration guide

## 🔄 In Progress / Next Steps

### Templates
- [ ] Create `api/heat_bracket_full.php` - Full template for admin view
  - Include full participant lists
  - Add flow configuration badges  
  - Show time information
  - Include action buttons

### Admin Interface Integration
- [ ] Update `admin/admin_heat_config.php` to use API (optional)
- [ ] Replace client-side bracket generation with API call
- [ ] Update JavaScript to handle API response format
- [ ] Test full template rendering

### Testing & Validation
- [ ] Test with real event data in development
- [ ] Verify SVG connections draw correctly
- [ ] Test heat detail popover functionality
- [ ] Verify auto-refresh works with new API
- [ ] Test with various heat flow configurations:
  - Single-source flows (simple bracket)
  - Multi-source flows (complex merges)
  - No flow configuration (start list only)
- [ ] Validate performance with large events (20+ heats)

### Edge Cases
- [ ] Handle heats with no participants
- [ ] Handle circular flow references (validation)
- [ ] Handle missing flow_source_heat values
- [ ] Handle JSON parsing errors in flow_source_heat
- [ ] Test with very long heat names (truncation)

### Enhancements
- [ ] Add caching mechanism for generated HTML
- [ ] Implement bracket redraw on window resize
- [ ] Add loading states during API calls
- [ ] Add retry logic for failed API calls
- [ ] Add keyboard navigation for heat cards
- [ ] Add accessibility attributes (ARIA labels)

## 🧪 Test Scenarios

### Basic Functionality
```
1. Load test_heat_bracket_api.php
2. Enter event ID 1
3. Select "Compact (Judge)" mode
4. Click "Load Bracket"
Expected: Bracket displays with heats organized by level
```

### Judge Interface
```
1. Login as judge
2. Navigate to score panel
3. Wait for "no active heat" condition
4. Observe bracket overlay
Expected: Compact bracket loads via API
```

### Connections
```
1. View bracket with multi-level flow
Expected: SVG connections draw in bracket style (junction-based)
```

### Heat Details
```
1. Click on a heat card in bracket
Expected: Popover shows heat info and participant list
```

## 📝 Code Review Checklist

- [x] No template literals in PHP-generated JavaScript
- [x] Proper error handling in API endpoint
- [x] Prepared statements for all database queries
- [x] JSON encoding/decoding with error checks
- [x] SVG namespace for DOM element creation
- [x] Proper event handler attachment
- [x] No global variable pollution
- [ ] SQL injection prevention (verify all queries)
- [ ] XSS prevention (verify all output escaping)
- [ ] Input validation on all parameters

## 🐛 Known Issues

None currently identified. Monitor during testing.

## 📊 Performance Considerations

- Database queries are optimized with proper indexes
- HTML generation happens server-side (reduces client load)
- Connections array is simple structure (minimal processing)
- SVG rendering is efficient for typical heat counts (<20)
- Consider caching for events with 20+ heats

## 🔒 Security Review

- Event ID validated as integer
- Database uses prepared statements
- No direct user input in HTML output
- JSON response prevents XSS
- Template files not directly accessible (included via PHP)

## 📱 Browser Compatibility

- Chrome: ✓ (Expected - uses modern fetch, SVG)
- Firefox: ✓ (Expected)
- Safari: ✓ (Expected)
- Edge: ✓ (Expected)
- Mobile browsers: ✓ (Expected - responsive design)

## 🎯 Success Criteria

1. API returns valid JSON with HTML and connections
2. Bracket displays correctly in judge interface
3. SVG connections draw in bracket style
4. Heat detail popovers show correct information
5. No JavaScript errors in console
6. Performance is acceptable (<1s load time)
7. Works across different browsers
8. Handles edge cases gracefully

## 🚀 Deployment Notes

### Files to Deploy
```
api/heat_bracket_view_api.php
api/heat_bracket_compact.php
judge/score.php (updated)
test_heat_bracket_api.php (optional)
HEAT_BRACKET_API.md (documentation)
```

### Database Requirements
- No new tables needed
- Uses existing: event_heat_settings, event_participants, participants

### Configuration
- No special configuration required
- Uses existing database connection from includes/db.php

### Rollback Plan
If issues arise:
1. Revert judge/score.php to previous version (restore client-side generation)
2. Remove API files (non-breaking - only called by updated score.php)
3. No database changes to rollback
