# VIEW-002: Component X-Ray

**View Type:** 📋 Sidebar Panel (opens alongside canvas)

## Overview

A summary card view that shows everything important about a component at a glance: what it does, what goes in and out, what it contains, where it's used, and what external calls it makes. Think of it as the "component profile page."

**Estimate:** 2-3 days  
**Priority:** HIGH  
**Complexity:** Low  
**Dependencies:** VIEW-000 (Foundation)

---

## The Problem

To understand a component today, you have to:
1. Open it in the canvas
2. Scroll around to see all nodes
3. Mentally categorize what's there
4. Check the Component Inputs/Outputs nodes to understand the interface
5. Hunt for REST/Function calls scattered around
6. Go back to the Components Panel to see if it's used elsewhere

There's no quick "tell me about this component" view.

---

## The Solution

A single-screen summary that answers:
- **What does this component do?** (Node breakdown by category)
- **What's the interface?** (Inputs and outputs)
- **What's inside?** (Subcomponents used)
- **Where is it used?** (Parent components)
- **What external things does it touch?** (REST, Functions, Events)

---

## User Stories

1. **As a developer reviewing code**, I want to quickly understand what a component does without diving into the canvas.

2. **As a developer debugging**, I want to see all external dependencies (API calls, events) in one place.

3. **As a developer refactoring**, I want to know everywhere this component is used before I change it.

4. **As a new team member**, I want to understand component interfaces (inputs/outputs) without reading the implementation.

---

## UI Design

### X-Ray Card View

```
┌─────────────────────────────────────────────────────────────────┐
│ Component X-Ray                                     [Open →]    │
├─────────────────────────────────────────────────────────────────┤
│                                                                 │
│ ┌─────────────────────────────────────────────────────────────┐ │
│ │ 🧩 AuthFlow                                                 │ │
│ │ /Components/Auth/AuthFlow                                   │ │
│ └─────────────────────────────────────────────────────────────┘ │
│                                                                 │
│ ┌─ USED IN (3 places) ────────────────────────────────────────┐ │
│ │ 📄 Login Page          [→ Open]                             │ │
│ │ 📄 Settings Page       [→ Open]                             │ │
│ │ 📄 App Shell           [→ Open]                             │ │
│ └─────────────────────────────────────────────────────────────┘ │
│                                                                 │
│ ┌─ INTERFACE ─────────────────────────────────────────────────┐ │
│ │ INPUTS                      │ OUTPUTS                       │ │
│ │ ────────                    │ ─────────                     │ │
│ │ → onLoginRequest (signal)   │ currentUser (object) →        │ │
│ │ → redirectUrl (string)      │ authError (string) →          │ │
│ │ → initialMode (string)      │ isAuthenticated (boolean) →   │ │
│ │                             │ onSuccess (signal) →          │ │
│ │                             │ onFailure (signal) →          │ │
│ └─────────────────────────────────────────────────────────────┘ │
│                                                                 │
│ ┌─ CONTAINS ──────────────────────────────────────────────────┐ │
│ │ SUBCOMPONENTS                                               │ │
│ │ └─ LoginForm (component)            [→ X-Ray]               │ │
│ │ └─ SignupForm (component)           [→ X-Ray]               │ │
│ │ └─ ForgotPassword (component)       [→ X-Ray]               │ │
│ │                                                             │ │
│ │ NODE BREAKDOWN                                              │ │
│ │ ├─ 📦 Visual      12 nodes (Groups, Text, Images)          │ │
│ │ ├─ 💾 Data         5 nodes (Variables, Objects)            │ │
│ │ ├─ ⚡ Logic        8 nodes (Conditions, Expressions)       │ │
│ │ ├─ 📡 Events       3 nodes (Send/Receive Event)            │ │
│ │ └─ 🔧 Other        2 nodes                                  │ │
│ │                    ─────                                    │ │
│ │                    30 total                                 │ │
│ └─────────────────────────────────────────────────────────────┘ │
│                                                                 │
│ ┌─ EXTERNAL DEPENDENCIES ─────────────────────────────────────┐ │
│ │ 🌐 REST Calls                                               │ │
│ │    POST /api/auth/login           [→ Find]                  │ │
│ │    POST /api/auth/signup          [→ Find]                  │ │
│ │    POST /api/auth/reset-password  [→ Find]                  │ │
│ │                                                             │ │
│ │ 📨 Events Sent                                              │ │
│ │    "auth:success"                 [→ Find receivers]        │ │
│ │    "auth:failure"                 [→ Find receivers]        │ │
│ │                                                             │ │
│ │ 📩 Events Received                                          │ │
│ │    "app:logout"                   [→ Find senders]          │ │
│ │                                                             │ │
│ │ 🔧 Functions                                                │ │
│ │    validateEmail                  [→ Find]                  │ │
│ │    hashPassword                   [→ Find]                  │ │
│ └─────────────────────────────────────────────────────────────┘ │
│                                                                 │
│ ┌─ INTERNAL STATE ────────────────────────────────────────────┐ │
│ │ Variables: authMode, errorMessage, isLoading                │ │
│ │ Objects: pendingUser, formData                              │ │
│ │ States: formState (login|signup|reset), loadingState        │ │
│ └─────────────────────────────────────────────────────────────┘ │
│                                                                 │
└─────────────────────────────────────────────────────────────────┘
```

### Collapsed View (for quick scanning)

```
┌─────────────────────────────────────────────────────────────────┐
│ 🧩 AuthFlow                  Used in: 3 | Nodes: 30 | APIs: 3  │
│    ↓ 3 inputs  ↑ 5 outputs   Contains: LoginForm +2            │
└─────────────────────────────────────────────────────────────────┘
```

### Interactions

- **[Open →]** - Jump to this component in the canvas
- **[→ X-Ray]** - Show X-Ray for that subcomponent
- **[→ Find]** - Jump to that node in the canvas
- **[→ Find receivers/senders]** - Show all nodes that receive/send that event
- **Click "USED IN" item** - Jump to the parent component
- **Expand/Collapse sections** - Toggle visibility of sections

---

## Technical Design

### Data Model

```typescript
interface ComponentXRay {
  // Identity
  name: string;
  fullName: string;
  path: string;  // Folder path
  
  // Usage
  usedIn: {
    component: ComponentModel;
    instanceCount: number;
  }[];
  
  // Interface
  inputs: {
    name: string;
    type: string;
    isSignal: boolean;
  }[];
  outputs: {
    name: string;
    type: string;
    isSignal: boolean;
  }[];
  
  // Contents
  subcomponents: {
    name: string;
    component: ComponentModel;
  }[];
  nodeBreakdown: {
    category: NodeCategory;
    count: number;
    nodeTypes: { type: string; count: number }[];
  }[];
  totalNodes: number;
  
  // External dependencies
  restCalls: {
    method: string;
    endpoint: string;
    nodeId: string;
  }[];
  eventsSent: {
    eventName: string;
    nodeId: string;
  }[];
  eventsReceived: {
    eventName: string;
    nodeId: string;
  }[];
  functionCalls: {
    functionName: string;
    nodeId: string;
  }[];
  
  // Internal state
  variables: { name: string; nodeId: string }[];
  objects: { name: string; nodeId: string }[];
  statesNodes: { 
    name: string; 
    nodeId: string; 
    states: string[];
  }[];
}
```

### Building X-Ray Data

```typescript
function buildComponentXRay(
  project: ProjectModel,
  component: ComponentModel
): ComponentXRay {
  const xray: ComponentXRay = {
    name: component.name,
    fullName: component.fullName,
    path: getComponentPath(component),
    usedIn: findComponentUsages(project, component.fullName),
    inputs: getComponentInputs(component),
    outputs: getComponentOutputs(component),
    subcomponents: [],
    nodeBreakdown: [],
    totalNodes: 0,
    restCalls: [],
    eventsSent: [],
    eventsReceived: [],
    functionCalls: [],
    variables: [],
    objects: [],
    statesNodes: []
  };
  
  // Analyze all nodes in the component
  component.graph.forEachNode((node) => {
    xray.totalNodes++;
    
    // Check for subcomponents
    if (isComponentInstance(node)) {
      xray.subcomponents.push({
        name: node.type.name,
        component: findComponent(project, node.type.name)
      });
    }
    
    // Check for REST calls
    if (node.type.name === 'REST' || node.type.name.includes('REST')) {
      xray.restCalls.push({
        method: node.parameters.method || 'GET',
        endpoint: node.parameters.endpoint || node.parameters.url,
        nodeId: node.id
      });
    }
    
    // Check for events
    if (node.type.name === 'Send Event') {
      xray.eventsSent.push({
        eventName: node.parameters.eventName || node.parameters.channel,
        nodeId: node.id
      });
    }
    if (node.type.name === 'Receive Event') {
      xray.eventsReceived.push({
        eventName: node.parameters.eventName || node.parameters.channel,
        nodeId: node.id
      });
    }
    
    // Check for functions
    if (node.type.name === 'Function' || node.type.name === 'Javascript') {
      xray.functionCalls.push({
        functionName: node.label || node.parameters.name || 'Anonymous',
        nodeId: node.id
      });
    }
    
    // Check for state nodes
    if (node.type.name === 'Variable') {
      xray.variables.push({ name: node.label || 'Unnamed', nodeId: node.id });
    }
    if (node.type.name === 'Object') {
      xray.objects.push({ name: node.label || 'Unnamed', nodeId: node.id });
    }
    if (node.type.name === 'States') {
      xray.statesNodes.push({
        name: node.label || 'Unnamed',
        nodeId: node.id,
        states: extractStatesFromNode(node)
      });
    }
  });
  
  // Build category breakdown
  xray.nodeBreakdown = buildCategoryBreakdown(component);
  
  return xray;
}
```

---

## Implementation Phases

### Phase 1: Data Collection (0.5-1 day)

1. Implement `buildComponentXRay()` function
2. Extract inputs/outputs from Component Inputs/Outputs nodes
3. Detect subcomponent usages
4. Find REST, Event, Function nodes
5. Find state-related nodes (Variables, Objects, States)

**Verification:**
- [ ] All sections populated correctly for test component
- [ ] Subcomponent detection works
- [ ] External dependencies found

### Phase 2: Basic UI (1 day)

1. Create `ComponentXRayView` React component
2. Implement collapsible sections
3. Style the card layout
4. Add icons for categories

**Verification:**
- [ ] All sections render correctly
- [ ] Sections expand/collapse
- [ ] Looks clean and readable

### Phase 3: Interactivity (0.5-1 day)

1. Implement "Open in Canvas" navigation
2. Implement "Find Node" navigation
3. Implement "Show X-Ray" for subcomponents
4. Add "Find receivers/senders" for events
5. Wire up to Analysis Panel context

**Verification:**
- [ ] All navigation links work
- [ ] Can drill into subcomponents
- [ ] Event tracking works

### Phase 4: Polish (0.5 day)

1. Add collapsed summary view
2. Improve typography and spacing
3. Add empty state handling
4. Performance optimization

**Verification:**
- [ ] Collapsed view useful
- [ ] Empty sections handled gracefully
- [ ] Renders quickly

---

## Files to Create

```
packages/noodl-editor/src/editor/src/views/AnalysisPanel/
└── ComponentXRayView/
    ├── index.ts
    ├── ComponentXRayView.tsx
    ├── ComponentXRayView.module.scss
    ├── XRaySection.tsx
    ├── InterfaceSection.tsx
    ├── ContentsSection.tsx
    ├── DependenciesSection.tsx
    ├── StateSection.tsx
    └── useComponentXRay.ts
```

---

## Success Criteria

- [ ] Shows accurate usage count
- [ ] Shows correct inputs/outputs with types
- [ ] Lists all subcomponents
- [ ] Finds all REST calls with endpoints
- [ ] Finds all Send/Receive Events
- [ ] Finds all Function nodes
- [ ] Node breakdown by category is accurate
- [ ] All navigation links work
- [ ] Renders in < 500ms

---

## Future Enhancements

- **Diff view** - Compare two components side by side
- **History** - See how component changed over time (if git integrated)
- **Documentation** - Allow adding/viewing component descriptions
- **Complexity score** - Calculate a complexity metric
- **Warnings** - Flag potential issues (unused inputs, orphan nodes)

---

## Risks & Mitigations

| Risk | Mitigation |
|------|------------|
| Node type detection misses edge cases | Start with common types, expand based on testing |
| Component inputs/outputs detection fails | Test with various component patterns |
| Too much information overwhelming | Use collapsible sections, start collapsed |

---

## Dependencies

- VIEW-000 Foundation (for traversal and categorization utilities)

## Blocks

- None (independent view)