c4-architecture

# C4 Architecture Documentation

Generate software architecture documentation using C4 model diagrams in Mermaid syntax.

## Workflow

1. **Understand scope** - Determine which C4 level(s) are needed based on audience
2. **Analyze codebase** - Explore the system to identify components, containers, and relationships
3. **Generate diagrams** - Create Mermaid C4 diagrams at appropriate abstraction levels
4. **Document** - Write diagrams to markdown files with explanatory context

## C4 Diagram Levels

Select the appropriate level based on the documentation need:

| Level | Diagram Type | Audience | Shows | When to Create |
|-------|-------------|----------|-------|----------------|
| 1 | **C4Context** | Everyone | System + external actors | Always (required) |
| 2 | **C4Container** | Technical | Apps, databases, services | Always (required) |
| 3 | **C4Component** | Developers | Internal components | Only if adds value |
| 4 | **C4Deployment** | DevOps | Infrastructure nodes | For production systems |
| - | **C4Dynamic** | Technical | Request flows (numbered) | For complex workflows |

**Key Insight:** "Context + Container diagrams are sufficient for most software development teams." Only create Component/Code diagrams when they genuinely add value.

## Quick Start Examples

### System Context (Level 1)
```mermaid
C4Context
  title System Context - Workout Tracker

  Person(user, "User", "Tracks workouts and exercises")
  System(app, "Workout Tracker", "Vue PWA for tracking strength and CrossFit workouts")
  System_Ext(browser, "Web Browser", "Stores data in IndexedDB")

  Rel(user, app, "Uses")
  Rel(app, browser, "Persists data to", "IndexedDB")
```

### Container Diagram (Level 2)
```mermaid
C4Container
  title Container Diagram - Workout Tracker

  Person(user, "User", "Tracks workouts")

  Container_Boundary(app, "Workout Tracker PWA") {
    Container(spa, "SPA", "Vue 3, TypeScript", "Single-page application")
    Container(pinia, "State Management", "Pinia", "Manages application state")
    ContainerDb(indexeddb, "IndexedDB", "Dexie", "Local workout storage")
  }

  Rel(user, spa, "Uses")
  Rel(spa, pinia, "Reads/writes state")
  Rel(pinia, indexeddb, "Persists", "Dexie ORM")
```

### Component Diagram (Level 3)
```mermaid
C4Component
  title Component Diagram - Workout Feature

  Container(views, "Views", "Vue Router pages")

  Container_Boundary(workout, "Workout Feature") {
    Component(useWorkout, "useWorkout", "Composable", "Workout execution state")
    Component(useTimer, "useTimer", "Composable", "Timer state machine")
    Component(workoutRepo, "WorkoutRepository", "Dexie", "Workout persistence")
  }

  Rel(views, useWorkout, "Uses")
  Rel(useWorkout, useTimer, "Controls")
  Rel(useWorkout, workoutRepo, "Saves to")
```

### Dynamic Diagram (Request Flow)
```mermaid
C4Dynamic
  title Dynamic Diagram - User Sign In Flow

  ContainerDb(db, "Database", "PostgreSQL", "User credentials")
  Container(spa, "Single-Page App", "React", "Banking UI")

  Container_Boundary(api, "API Application") {
    Component(signIn, "Sign In Controller", "Express", "Auth endpoint")
    Component(security, "Security Service", "JWT", "Validates credentials")
  }

  Rel(spa, signIn, "1. Submit credentials", "JSON/HTTPS")
  Rel(signIn, security, "2. Validate")
  Rel(security, db, "3. Query user", "SQL")

  UpdateRelStyle(spa, signIn, $textColor="blue", $offsetY="-30")
```

### Deployment Diagram
```mermaid
C4Deployment
  title Deployment Diagram - Production

  Deployment_Node(browser, "Customer Browser", "Chrome/Firefox") {
    Container(spa, "SPA", "React", "Web application")
  }

  Deployment_Node(aws, "AWS Cloud", "us-east-1") {
    Deployment_Node(ecs, "ECS Cluster", "Fargate") {
      Container(api, "API Service", "Node.js", "REST API")
    }
    Deployment_Node(rds, "RDS", "db.r5.large") {
      ContainerDb(db, "Database", "PostgreSQL", "Application data")
    }
  }

  Rel(spa, api, "API calls", "HTTPS")
  Rel(api, db, "Reads/writes", "JDBC")
```

## Element Syntax

### People and Systems
```
Person(alias, "Label", "Description")
Person_Ext(alias, "Label", "Description")       # External person
System(alias, "Label", "Description")
System_Ext(alias, "Label", "Description")       # External system
SystemDb(alias, "Label", "Description")         # Database system
SystemQueue(alias, "Label", "Description")      # Queue system
```

### Containers
```
Container(alias, "Label", "Technology", "Description")
Container_Ext(alias, "Label", "Technology", "Description")
ContainerDb(alias, "Label", "Technology", "Description")
ContainerQueue(alias, "Label", "Technology", "Description")
```

### Components
```
Component(alias, "Label", "Technology", "Description")
Component_Ext(alias, "Label", "Technology", "Description")
ComponentDb(alias, "Label", "Technology", "Description")
```

### Boundaries
```
Enterprise_Boundary(alias, "Label") { ... }
System_Boundary(alias, "Label") { ... }
Container_Boundary(alias, "Label") { ... }
Boundary(alias, "Label", "type") { ... }
```

### Relationships
```
Rel(from, to, "Label")
Rel(from, to, "Label", "Technology")
BiRel(from, to, "Label")                        # Bidirectional
Rel_U(from, to, "Label")                        # Upward
Rel_D(from, to, "Label")                        # Downward
Rel_L(from, to, "Label")                        # Leftward
Rel_R(from, to, "Label")                        # Rightward
```

### Deployment Nodes
```
Deployment_Node(alias, "Label", "Type", "Description") { ... }
Node(alias, "Label", "Type", "Description") { ... }  # Shorthand
```

## Styling and Layout

### Layout Configuration
```
UpdateLayoutConfig($c4ShapeInRow="3", $c4BoundaryInRow="1")
```
- `$c4ShapeInRow` - Number of shapes per row (default: 4)
- `$c4BoundaryInRow` - Number of boundaries per row (default: 2)

### Element Styling
```
UpdateElementStyle(alias, $fontColor="red", $bgColor="grey", $borderColor="red")
```

### Relationship Styling
```
UpdateRelStyle(from, to, $textCol