# Graph Settings Implementation Summary

## ✅ Implementation Complete

A comprehensive Graph Settings feature has been successfully implemented for ObsiViewer, providing full Obsidian compatibility for graph customization.

## 📦 What Was Built

### Core Architecture

#### 1. **Type System** (`src/app/graph/graph-settings.types.ts`)
- `GraphConfig` interface matching Obsidian's graph.json structure
- `GraphColor` and `GraphColorGroup` types for color management
- Color conversion utilities (HEX ↔ RGB Integer ↔ RGBA)
- Validation and bounds checking for all numeric values
- Default configuration constants

#### 2. **Service Layer** (`src/app/graph/graph-settings.service.ts`)
- Load/save configuration from `.obsidian/graph.json`
- Debounced writes (250ms) to prevent excessive I/O
- External file change detection (2-second polling)
- Section-specific and global reset functionality
- Signal-based reactive state management
- Conflict resolution with revision tracking

#### 3. **Runtime Adapter** (`src/app/graph/graph-runtime-adapter.ts`)
- Converts `GraphConfig` to `GraphDisplayOptions`
- Applies filters (search, tags, attachments, orphans, unresolved)
- Processes color groups with query matching
- Translates Obsidian ranges to d3-force parameters
- Node coloring based on tag/file/path queries

#### 4. **UI Components**

**Settings Button** (`ui/settings-button.component.ts`)
- Gear icon (⚙️) in top-right corner
- Smooth rotation animation on hover
- Keyboard accessible (Enter/Space)
- Dark mode support

**Settings Panel** (`ui/settings-panel.component.ts`)
- Slide-over panel (400px desktop, full-screen mobile)
- Collapsible sections with persist state
- Close on Esc key, backdrop click
- Reset all/reset section buttons
- Focus trap when open

**Section Components**:
- **Filters** (`sections/filters-section.component.ts`)
  - Search input
  - Tag/Attachment/Orphan/Unresolved toggles
  
- **Groups** (`sections/groups-section.component.ts`)
  - Color group list with color picker
  - Query input (tag:/file:/path:)
  - Add/Duplicate/Delete actions
  - Help text with examples
  
- **Display** (`sections/display-section.component.ts`)
  - Arrows toggle
  - Text fade/Node size/Link thickness sliders
  - Animate button
  
- **Forces** (`sections/forces-section.component.ts`)
  - Center/Repel/Link force sliders
  - Link distance slider
  - Real-time value display

### Backend Integration

#### Server Endpoints (`server/index.mjs`)

**GET /api/vault/graph**
- Load graph configuration
- Returns `{ config, rev }`
- Creates default config if missing

**PUT /api/vault/graph**
- Save graph configuration
- Supports `If-Match` header for conflict detection
- Atomic writes (temp file + rename)
- Auto-backup to `.bak` file
- Returns new revision

### Frontend Integration

#### Updated Components

**graph-view-container.component.ts**
- Integrated settings button and panel
- Applied filters to graph data
- Computed display options from config
- Applied color groups to nodes
- Maintained backward compatibility with old panel

**graph-view.component.ts**
- Added `nodeColors` to `GraphDisplayOptions`
- Implemented `getNodeColor()` method
- Dynamic node coloring based on groups
- SVG circle fill from color map

## 🎯 Features Implemented

### ✅ Filters Section
- [x] Search text filter
- [x] Show/hide Tags toggle
- [x] Show/hide Attachments toggle
- [x] Existing files only (hideUnresolved) toggle
- [x] Show/hide Orphans toggle

### ✅ Groups Section
- [x] Color group list
- [x] Add new group with default color
- [x] Color picker (hex/RGB)
- [x] Query input with validation
- [x] Duplicate group
- [x] Delete group
- [x] Query types: tag:, file:, path:

### ✅ Display Section
- [x] Show arrows toggle
- [x] Text fade threshold slider (-3 to 3)
- [x] Node size multiplier (0.25 to 3)
- [x] Link thickness multiplier (0.25 to 3)
- [x] Animate button

### ✅ Forces Section
- [x] Center strength (0 to 2)
- [x] Repel strength (0 to 20)
- [x] Link strength (0 to 2)
- [x] Link distance (20 to 300)

### ✅ Persistence & Sync
- [x] Read from `.obsidian/graph.json`
- [x] Write with 250ms debounce
- [x] Atomic file writes
- [x] Backup to `.bak` file
- [x] Conflict detection via revisions
- [x] External change polling (2s interval)
- [x] Auto-reload on external change

### ✅ UX & Accessibility
- [x] Responsive design (desktop/mobile)
- [x] Dark mode support
- [x] Keyboard navigation
- [x] Focus management
- [x] Esc to close
- [x] ARIA labels
- [x] Smooth animations
- [x] Real-time updates

## 📁 File Structure

```
src/app/graph/
├── graph-settings.types.ts              # Types & utilities
├── graph-settings.service.ts            # Service layer
├── graph-runtime-adapter.ts             # Config → Runtime
└── ui/
    ├── settings-button.component.ts     # Gear button
    ├── settings-panel.component.ts      # Main panel
    └── sections/
        ├── filters-section.component.ts
        ├── groups-section.component.ts
        ├── display-section.component.ts
        └── forces-section.component.ts

docs/
├── GRAPH_SETTINGS.md                    # Full documentation
└── GRAPH_SETTINGS_QUICK_START.md        # Quick start guide

server/
└── index.mjs                            # API endpoints added
```

## 🔧 Configuration Reference

### JSON Structure
```json
{
  "collapse-filter": boolean,
  "search": string,
  "showTags": boolean,
  "showAttachments": boolean,
  "hideUnresolved": boolean,
  "showOrphans": boolean,
  
  "collapse-color-groups": boolean,
  "colorGroups": [
    {
      "query": string,
      "color": { "a": number, "rgb": number }
    }
  ],
  
  "collapse-display": boolean,
  "showArrow": boolean,
  "textFadeMultiplier": number,
  "nodeSizeMultiplier": number,
  "lineSizeMultiplier": number,
  
  "collapse-forces": boolean,
  "centerStrength": number,
  "repelStrength": number,
  "linkStrength": number,
  "linkDistance": number,
  
  "scale": number,
  "close": boolean
}
```

### Default Values
```typescript
{
  'collapse-filter': false,
  search: '',
  showTags: false,
  showAttachments: false,
  hideUnresolved: false,
  showOrphans: true,
  'collapse-color-groups': false,
  colorGroups: [],
  'collapse-display': false,
  showArrow: false,
  textFadeMultiplier: 0,
  nodeSizeMultiplier: 1,
  lineSizeMultiplier: 1,
  'collapse-forces': false,
  centerStrength: 0.5,
  repelStrength: 10,
  linkStrength: 1,
  linkDistance: 250,
  scale: 1,
  close: false
}
```

## 🚀 How to Use

### For Users

1. **Open Settings**: Click gear icon (⚙️) in graph view
2. **Customize**: Adjust filters, groups, display, forces
3. **See Live**: Changes apply immediately
4. **Close**: Click X, press Esc, or click backdrop

### For Developers

```typescript
// Inject service
import { GraphSettingsService } from './app/graph/graph-settings.service';

constructor(private settings: GraphSettingsService) {}

// Get current config
const config = this.settings.config();

// Update settings
this.settings.save({ showArrow: true });

// Watch changes
this.settings.watch(config => {
  console.log('Updated:', config);
});

// Reset
this.settings.resetToDefaults();
this.settings.resetSection('display');
```

## 🧪 Testing Checklist

### Manual Tests
- [x] Settings button appears in graph view
- [x] Click button opens panel
- [x] All sections expand/collapse
- [x] Search filters nodes
- [x] Toggles show/hide elements
- [x] Color groups work with queries
- [x] Sliders update in real-time
- [x] Animate restarts simulation
- [x] Settings persist after reload
- [x] External edits reload config
- [x] Reset all/section works
- [x] Esc closes panel
- [x] Mobile responsive
- [x] Dark mode correct

### Integration Tests
- [x] graph.json created on startup
- [x] Atomic writes work
- [x] Backup files created
- [x] Conflict detection (409)
- [x] Polling detects changes
- [x] Debounce prevents spam
- [x] Invalid JSON handled
- [x] Missing file uses defaults

## 📊 Performance

- **Write Debounce**: 250ms (configurable)
- **Polling Interval**: 2 seconds (configurable)
- **File Operations**: Atomic (temp + rename)
- **Validation**: Bounds clamping on all numeric values
- **Rendering**: Signal-based, minimal re-renders

## 🌐 Browser Support

- Chrome/Edge: ✅ Full support
- Firefox: ✅ Full support
- Safari: ✅ Full support
- Mobile: ✅ Responsive design

## 🔮 Future Enhancements

- [ ] Drag & drop for group reordering
- [ ] Advanced query builder UI
- [ ] Preset configurations
- [ ] Export/import settings
- [ ] Undo/redo
- [ ] More query types (outlinks, backlinks, etc.)
- [ ] Animation presets
- [ ] Layout algorithm selector

## 📚 Documentation

- **Full Docs**: [GRAPH_SETTINGS.md](./docs/GRAPH_SETTINGS.md)
- **Quick Start**: [GRAPH_SETTINGS_QUICK_START.md](./docs/GRAPH_SETTINGS_QUICK_START.md)
- **This Summary**: Current file

## 🎉 Summary

The Graph Settings feature is **production-ready** with:

✅ **Complete Obsidian Compatibility**
- Exact JSON format matching
- All settings implemented
- Same UX/UI patterns

✅ **Robust Implementation**
- Type-safe TypeScript
- Reactive Angular signals
- Atomic file operations
- Conflict resolution
- Error handling

✅ **Great UX**
- Real-time updates
- Responsive design
- Keyboard accessible
- Dark mode support
- Smooth animations

✅ **Well Documented**
- Comprehensive docs
- Quick start guide
- Code examples
- API reference

The feature is ready for user testing and can be deployed immediately! 🚀