docs: expand documentation with comprehensive tools and development guides
- Add detailed documentation for various tools and management interfaces - Create development best practices and interface documentation - Expand tools section with device management, automation, and event subscription guides - Include configuration, usage examples, and error handling for each tool - Update MkDocs navigation to reflect new documentation structure
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docs/development/best-practices.md
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docs/development/best-practices.md
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# Development Best Practices
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This guide outlines the best practices for developing tools and features for the Home Assistant MCP.
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## Code Style
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### TypeScript
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1. Use TypeScript for all new code
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2. Enable strict mode
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3. Use explicit types
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4. Avoid `any` type
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5. Use interfaces over types
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6. Document with JSDoc comments
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```typescript
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/**
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* Represents a device in the system.
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* @interface
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*/
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interface Device {
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/** Unique device identifier */
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id: string;
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/** Human-readable device name */
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name: string;
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/** Device state */
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state: DeviceState;
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}
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```
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### Naming Conventions
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1. Use PascalCase for:
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- Classes
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- Interfaces
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- Types
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- Enums
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2. Use camelCase for:
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- Variables
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- Functions
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- Methods
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- Properties
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3. Use UPPER_SNAKE_CASE for:
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- Constants
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- Enum values
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```typescript
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class DeviceManager {
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private readonly DEFAULT_TIMEOUT = 5000;
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async getDeviceState(deviceId: string): Promise<DeviceState> {
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// Implementation
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}
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}
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```
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## Architecture
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### SOLID Principles
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1. Single Responsibility
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- Each class/module has one job
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- Split complex functionality
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2. Open/Closed
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- Open for extension
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- Closed for modification
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3. Liskov Substitution
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- Subtypes must be substitutable
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- Use interfaces properly
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4. Interface Segregation
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- Keep interfaces focused
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- Split large interfaces
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5. Dependency Inversion
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- Depend on abstractions
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- Use dependency injection
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### Example
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```typescript
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// Bad
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class DeviceManager {
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async getState() { /* ... */ }
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async setState() { /* ... */ }
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async sendNotification() { /* ... */ } // Wrong responsibility
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}
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// Good
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class DeviceManager {
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constructor(
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private notifier: NotificationService
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) {}
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async getState() { /* ... */ }
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async setState() { /* ... */ }
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}
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class NotificationService {
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async send() { /* ... */ }
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}
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```
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## Error Handling
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### Best Practices
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1. Use custom error classes
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2. Include error codes
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3. Provide meaningful messages
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4. Include error context
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5. Handle async errors
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6. Log appropriately
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```typescript
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class DeviceError extends Error {
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constructor(
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message: string,
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public code: string,
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public context: Record<string, any>
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) {
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super(message);
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this.name = 'DeviceError';
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}
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}
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try {
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await device.connect();
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} catch (error) {
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throw new DeviceError(
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'Failed to connect to device',
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'DEVICE_CONNECTION_ERROR',
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{ deviceId: device.id, attempt: 1 }
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);
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}
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```
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## Testing
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### Guidelines
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1. Write unit tests first
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2. Use meaningful descriptions
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3. Test edge cases
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4. Mock external dependencies
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5. Keep tests focused
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6. Use test fixtures
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```typescript
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describe('DeviceManager', () => {
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let manager: DeviceManager;
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let mockDevice: jest.Mocked<Device>;
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beforeEach(() => {
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mockDevice = {
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id: 'test_device',
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getState: jest.fn()
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};
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manager = new DeviceManager(mockDevice);
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});
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it('should get device state', async () => {
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mockDevice.getState.mockResolvedValue('on');
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const state = await manager.getDeviceState();
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expect(state).toBe('on');
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});
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});
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```
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## Performance
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### Optimization
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1. Use caching
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2. Implement pagination
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3. Optimize database queries
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4. Use connection pooling
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5. Implement rate limiting
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6. Batch operations
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```typescript
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class DeviceCache {
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private cache = new Map<string, CacheEntry>();
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private readonly TTL = 60000; // 1 minute
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async getDevice(id: string): Promise<Device> {
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const cached = this.cache.get(id);
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if (cached && Date.now() - cached.timestamp < this.TTL) {
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return cached.device;
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}
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const device = await this.fetchDevice(id);
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this.cache.set(id, {
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device,
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timestamp: Date.now()
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});
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return device;
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}
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}
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```
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## Security
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### Guidelines
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1. Validate all input
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2. Use parameterized queries
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3. Implement rate limiting
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4. Use proper authentication
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5. Follow OWASP guidelines
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6. Sanitize output
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```typescript
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class InputValidator {
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static validateDeviceId(id: string): boolean {
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return /^[a-zA-Z0-9_-]{1,64}$/.test(id);
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}
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static sanitizeOutput(data: any): any {
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// Implement output sanitization
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return data;
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}
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}
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```
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## Documentation
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### Standards
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1. Use JSDoc comments
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2. Document interfaces
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3. Include examples
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4. Document errors
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5. Keep docs updated
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6. Use markdown
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```typescript
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/**
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* Manages device operations.
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* @class
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*/
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class DeviceManager {
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/**
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* Gets the current state of a device.
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* @param {string} deviceId - The device identifier.
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* @returns {Promise<DeviceState>} The current device state.
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* @throws {DeviceError} If device is not found or unavailable.
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* @example
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* const state = await deviceManager.getDeviceState('living_room_light');
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*/
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async getDeviceState(deviceId: string): Promise<DeviceState> {
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// Implementation
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}
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}
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```
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## Logging
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### Best Practices
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1. Use appropriate levels
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2. Include context
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3. Structure log data
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4. Handle sensitive data
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5. Implement rotation
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6. Use correlation IDs
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```typescript
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class Logger {
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info(message: string, context: Record<string, any>) {
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console.log(JSON.stringify({
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level: 'info',
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message,
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context,
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timestamp: new Date().toISOString(),
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correlationId: context.correlationId
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}));
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}
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}
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```
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## Version Control
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### Guidelines
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1. Use meaningful commits
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2. Follow branching strategy
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3. Write good PR descriptions
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4. Review code thoroughly
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5. Keep changes focused
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6. Use conventional commits
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```bash
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# Good commit messages
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git commit -m "feat(device): add support for zigbee devices"
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git commit -m "fix(api): handle timeout errors properly"
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```
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## See Also
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- [Tool Development Guide](tools.md)
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- [Interface Documentation](interfaces.md)
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- [Testing Guide](../testing.md)
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