# Witness Visualization Components

> **Sprint:** SPRINT_20260118_020_FE_witness_visualization

The witness visualization component suite provides UI for displaying runtime witness data, comparing static analysis paths with runtime observations, and managing witness gate results in release promotion flows.

## Overview

Runtime witnesses confirm that static analysis reachability paths are actually exercised during application execution. These components visualize:

- **Witness Status**: Whether a path has been witnessed at runtime
- **Static vs Runtime Comparison**: Side-by-side or overlay views comparing predicted and observed paths
- **Gate Results**: Witness gate outcomes for release promotion decisions
- **Unwitnessed Advisories**: Paths requiring runtime exercise before promotion

## Components

### Core Components

| Component | Purpose | Location |
|-----------|---------|----------|
| `WitnessStatusChipComponent` | Status badge showing witness state | `shared/domain/witness-status-chip/` |
| `WitnessComparisonComponent` | Static vs runtime path comparison | `shared/components/witness-comparison/` |
| `UnwitnessedAdvisoryComponent` | Advisory panel for unwitnessed paths | `shared/components/unwitnessed-advisory/` |
| `GateSummaryPanelComponent` | Gate results with witness metrics | `shared/domain/gate-summary-panel/` |

### Witness Status Chip

Displays the witness status of a reachability path with color-coded badges.

```typescript
import { WitnessStatusChipComponent, WitnessStatus } from '@app/shared/domain/witness-status-chip';
```

#### States

| State | Color | Icon | Description |
|-------|-------|------|-------------|
| `witnessed` | Green | ✓ | Path confirmed by runtime observation |
| `unwitnessed` | Yellow | ○ | Path not yet observed at runtime |
| `stale` | Orange | ⏱ | Witness data is outdated |
| `failed` | Red | ✗ | Witness verification failed |

#### Usage

```html
<!-- Basic usage -->
<app-witness-status-chip [status]="'witnessed'" />

<!-- With details for tooltip -->
<app-witness-status-chip
  [status]="'witnessed'"
  [details]="{
    status: 'witnessed',
    lastObserved: '2026-01-15T10:30:00Z',
    observationCount: 42,
    rekorLogIndex: 12345
  }"
  [showCount]="true"
  (chipClick)="onChipClick()"
/>
```

#### Input Properties

| Property | Type | Default | Description |
|----------|------|---------|-------------|
| `status` | `WitnessStatus` | required | Witness status to display |
| `details` | `WitnessStatusDetails` | `null` | Optional metadata for tooltip |
| `showCount` | `boolean` | `true` | Whether to show observation count |

---

### Witness Comparison Component

Side-by-side or overlay view comparing static analysis paths with runtime observations. The main visualization for understanding witness coverage.

```typescript
import {
  WitnessComparisonComponent,
  WitnessComparisonData,
  ComparisonPathStep,
  ComparisonMetrics,
} from '@app/shared/components/witness-comparison';
```

#### Features

- **View Modes**: List view (vertical) or overlay view (side-by-side columns)
- **Color Coding**: Green (confirmed), yellow (static only), orange (runtime only/unexpected)
- **Filtering**: Filter by confirmation status
- **Metrics Summary**: Totals and confirmation rate display
- **Step Drill-down**: Click steps for detailed information

#### Usage

```html
<app-witness-comparison
  [data]="comparisonData"
  (stepClick)="onStepClick($event)"
  (refresh)="onRefresh()"
/>
```

#### Input Properties

| Property | Type | Description |
|----------|------|-------------|
| `data` | `WitnessComparisonData` | Comparison data with paths and metrics |

#### Output Events

| Event | Type | Description |
|-------|------|-------------|
| `stepClick` | `ComparisonPathStep` | Emitted when user clicks a step |
| `refresh` | `void` | Emitted when user requests data refresh |

#### Data Models

```typescript
interface ComparisonPathStep {
  nodeId: string;
  symbol: string;
  file?: string;
  line?: number;
  package?: string;
  inStatic: boolean;      // Found in static analysis
  inRuntime: boolean;     // Observed at runtime
  runtimeInvocations?: number;
  lastObserved?: string;
}

interface ComparisonMetrics {
  totalSteps: number;
  confirmedSteps: number;      // Both static and runtime
  staticOnlySteps: number;     // Static only (unwitnessed)
  runtimeOnlySteps: number;    // Runtime only (unexpected)
  confirmationRate: number;    // Percentage confirmed
}

interface WitnessComparisonData {
  claimId: string;
  cveId?: string;
  packageName: string;
  packageVersion?: string;
  pathSteps: ComparisonPathStep[];
  metrics: ComparisonMetrics;
  generatedAt: string;
}
```

---

### Unwitnessed Advisory Component

Advisory panel displayed when release promotion encounters paths without runtime witnesses. Used in the gate flow to inform operators about witness coverage gaps.

```typescript
import {
  UnwitnessedAdvisoryComponent,
  UnwitnessedAdvisoryData,
  UnwitnessedPath,
} from '@app/shared/components/unwitnessed-advisory';
```

#### Features

- **Severity Summary**: Visual breakdown by vulnerability severity
- **Path List**: Sortable list of unwitnessed paths
- **Blocking/Advisory Mode**: Different styling based on gate configuration
- **Action Buttons**: Create test tasks for individual paths or all at once

#### Usage

```html
<app-unwitnessed-advisory
  [data]="advisoryData"
  (createTestTask)="onCreateTestTask($event)"
  (createAllTestTasks)="onCreateAllTestTasks()"
  (viewComparison)="onViewComparison()"
/>
```

#### Input Properties

| Property | Type | Description |
|----------|------|-------------|
| `data` | `UnwitnessedAdvisoryData` | Advisory data with paths and configuration |

#### Output Events

| Event | Type | Description |
|-------|------|-------------|
| `createTestTask` | `UnwitnessedPath` | Create test task for specific path |
| `createAllTestTasks` | `void` | Create test tasks for all paths |
| `viewComparison` | `void` | Open full comparison view |

#### Data Models

```typescript
interface UnwitnessedPath {
  pathId: string;
  cveId?: string;
  vulnId: string;
  packageName: string;
  packageVersion?: string;
  entrypoint: string;
  sink: string;
  severity: 'critical' | 'high' | 'medium' | 'low' | 'unknown';
  confidence: number;
  lastAnalyzed?: string;
}

interface UnwitnessedAdvisoryData {
  totalUnwitnessed: number;
  paths: UnwitnessedPath[];
  targetEnvironment?: string;
  isBlocking: boolean;
}
```

---

### Gate Summary Panel (Extended)

Extended to support witness gate display with metrics, expandable details, and comparison links.

```typescript
import {
  GateSummaryPanelComponent,
  GateResult,
  WitnessGateMetrics,
  WitnessPathSummary,
} from '@app/shared/domain/gate-summary-panel';
```

#### Witness Gate Support

The `GateResult` interface now supports witness-specific properties:

```typescript
interface GateResult {
  id: string;
  name: string;
  state: 'PASS' | 'WARN' | 'BLOCK' | 'SKIP';
  reason?: string;
  ruleHits?: number;
  gateType?: 'standard' | 'witness' | 'cve' | 'sbom';
  witnessMetrics?: WitnessGateMetrics;
}

interface WitnessGateMetrics {
  totalPaths: number;
  witnessedPaths: number;
  unwitnessedPaths: number;
  stalePaths?: number;
  unwitnessedPathDetails?: WitnessPathSummary[];
}

interface WitnessPathSummary {
  pathId: string;
  entrypoint: string;
  sink: string;
  severity?: 'critical' | 'high' | 'medium' | 'low' | 'unknown';
  vulnId?: string;
}
```

#### Usage

```html
<app-gate-summary-panel
  [gates]="gates"
  [policyRef]="policyReference"
  [snapshotRef]="snapshotReference"
  (openExplain)="onOpenExplain($event)"
  (openEvidence)="onOpenEvidence()"
  (openComparison)="onOpenComparison($event)"
/>
```

#### Witness Gate Features

- **Metrics Display**: Shows X/Y witnessed paths, unwitnessed count, stale count
- **Advisory Styling**: Yellow border and background for WARN state witness gates
- **Expandable Details**: Click "Details" to see unwitnessed path list
- **Compare Button**: Opens full comparison view

---

## Color Coding Reference

### Comparison States

| State | Color | CSS Variable | Meaning |
|-------|-------|--------------|---------|
| Confirmed | Green | `--green-500` | Path in both static and runtime |
| Static Only | Yellow | `--yellow-500` | Path predicted but not observed |
| Runtime Only | Orange | `--orange-500` | Unexpected path observed |

### Severity Colors

| Severity | Color | CSS Variable |
|----------|-------|--------------|
| Critical | Red | `--red-500` |
| High | Orange | `--orange-500` |
| Medium | Yellow | `--yellow-500` |
| Low | Blue | `--blue-500` |
| Unknown | Gray | `--gray-400` |

---

## Integration with Existing Components

The witness visualization components integrate with several existing UI elements:

| Existing Component | Integration |
|--------------------|-------------|
| `WitnessDrawerComponent` | Can embed comparison view |
| `WitnessPageComponent` | Full reachability analysis page |
| `TimelineListComponent` | Display witness observation timeline |
| `GateExplainDrawerComponent` | Show witness gate explanation |

---

## Accessibility

All witness visualization components follow WCAG 2.1 AA guidelines:

- ARIA labels for all interactive elements
- Keyboard navigation support
- Focus management for expandable sections
- Color + icon combinations (not color alone)
- Screen reader announcements for status changes

---

## Testing

Unit tests are located alongside components:

- `witness-status-chip.component.spec.ts`
- `witness-comparison.component.spec.ts`
- `unwitnessed-advisory.component.spec.ts`
- `gate-summary-panel.component.spec.ts`

Run tests:

```bash
cd src/Web/StellaOps.Web
npm test -- --include="**/*witness*" --include="**/*gate-summary*"
```