# Tool Instances Specification

## Requirements

### Functional Requirements

1. **ToolInstance Model**: Store instance metadata with status tracking
2. **Session API**: CRUD operations + lifecycle (start/stop/restart/delete)
3. **Docker Integration**: Render compose templates and execute commands
4. **Status Monitoring**: Real-time container status polling
5. **Log Access**: View container logs (last 100 lines)
6. **Session Navigation**: Active sessions appear in app shell
7. **URL Generation**: Unique access URLs for each running instance

### Non-Functional Requirements

1. **Security**: Isolated containers, no privileged mode
2. **Resource Limits**: CPU and memory constraints
3. **Error Handling**: Graceful failure with cleanup
4. **Performance**: Start time < 30 seconds

## API Specification

### Create Instance
```
POST /projects/{project_id}/repositories/{repo_id}/instances
Body: {
  tool_type_id: string,
  display_name: string (optional)
}
Response: {
  id: string,
  name: string,
  display_name: string,
  tool_type_id: string,
  status: "pending",
  created_at: string
}
```

### List Instances
```
GET /projects/{project_id}/repositories/{repo_id}/instances
Response: {
  instances: [...]
}
```

### Get Instance
```
GET /projects/{project_id}/repositories/{repo_id}/instances/{instance_id}
Response: {
  id: string,
  name: string,
  display_name: string,
  status: string,
  container_id: string | null,
  url: string | null,
  port: number | null,
  last_started_at: string | null,
  last_stopped_at: string | null,
  created_at: string
}
```

### Lifecycle Operations
```
POST /projects/{project_id}/repositories/{repo_id}/instances/{instance_id}/start
POST /projects/{project_id}/repositories/{repo_id}/instances/{instance_id}/stop
POST /projects/{project_id}/repositories/{repo_id}/instances/{instance_id}/restart
Response: { status: string }
```

### Delete Instance
```
DELETE /projects/{project_id}/repositories/{repo_id}/instances/{instance_id}
Response: 204 No Content
```

### Get User Sessions
```
GET /users/me/sessions
Response: {
  sessions: [
    {
      id: string,
      display_name: string,
      tool_type_name: string,
      tool_icon: string,
      repository_name: string,
      project_name: string,
      status: string,
      url: string | null
    }
  ]
}
```

## Docker Compose Template Variables

- `{{REPO_PATH}}`: Absolute path to git repository on host
- `{{INSTANCE_NAME}}`: Unique instance identifier
- `{{INSTANCE_ID}}`: UUID of the instance
- `{{TOOL_PORT}}`: Assigned port for the tool
- `{{USER_ID}}`: Owner user ID
- `{{PROJECT_ID}}`: Project ID

## Status Values

- `pending`: Instance created, waiting to start
- `building`: Docker compose up in progress
- `running`: Container is running
- `stopped`: Container stopped
- `error`: Container failed to start or crashed

## Database Schema

```sql
CREATE TABLE tool_instances (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    name VARCHAR(255) NOT NULL,
    display_name VARCHAR(255) NOT NULL,
    tool_type_id UUID NOT NULL REFERENCES tool_types(id),
    repository_id UUID NOT NULL REFERENCES git_repositories(id),
    project_id UUID NOT NULL REFERENCES projects(id),
    owner_id UUID NOT NULL REFERENCES users(id),
    status VARCHAR(50) NOT NULL DEFAULT 'pending',
    container_id VARCHAR(255),
    compose_path VARCHAR(1024),
    url VARCHAR(1024),
    port INTEGER,
    last_started_at TIMESTAMP WITH TIME ZONE,
    last_stopped_at TIMESTAMP WITH TIME ZONE,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

CREATE INDEX idx_tool_instances_owner ON tool_instances(owner_id);
CREATE INDEX idx_tool_instances_repo ON tool_instances(repository_id);
CREATE INDEX idx_tool_instances_status ON tool_instances(status);
```

## Testing Requirements

1. **Unit Tests**: Docker command generation, template rendering
2. **Integration Tests**: API endpoints, database operations
3. **Manual Testing**: Container lifecycle, navigation updates
