feat: Kiro first task & docs

Author: danieldanielecki

.kiro/specs/api-integrations/design.md

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+# Design Document
+
+## Overview
+
+The API integrations feature will enhance the existing AI provider system by implementing robust, production-ready integrations with multiple AI services. The design builds upon the current provider abstraction layer while adding comprehensive error handling, failover mechanisms, rate limiting, and monitoring capabilities.
+
+The system will maintain the existing `AIProvider` interface while extending it with additional capabilities for configuration management, health monitoring, and advanced error recovery. This ensures backward compatibility while providing the reliability needed for production use.
+
+## Architecture
+
+### High-Level Architecture
+
+```mermaid
+graph TB
+    Client[Client Application] --> AIService[AI Service Manager]
+    AIService --> ConfigManager[Configuration Manager]
+    AIService --> ProviderRegistry[Provider Registry]
+    AIService --> HealthMonitor[Health Monitor]
+    AIService --> RateLimiter[Rate Limiter]
+    
+    ProviderRegistry --> OpenAIClient[OpenAI Client]
+    ProviderRegistry --> GeminiClient[Gemini Client]
+    ProviderRegistry --> MistralClient[Mistral Client]
+    ProviderRegistry --> DeepSeekClient[DeepSeek Client]
+    ProviderRegistry --> DitectrevClient[Ditectrev Client]
+    ProviderRegistry --> OllamaClient[Ollama Client]
+    
+    OpenAIClient --> OpenAIAPI[OpenAI API]
+    GeminiClient --> GeminiAPI[Gemini API]
+    MistralClient --> MistralAPI[Mistral API]
+    DeepSeekClient --> DeepSeekAPI[DeepSeek API]
+    DitectrevClient --> DitectrevAPI[Ditectrev API]
+    OllamaClient --> OllamaAPI[Ollama Local]
+    
+    HealthMonitor --> MetricsStore[Metrics Store]
+    ConfigManager --> EnvConfig[Environment Config]
+```
+
+### Core Components
+
+1. **AI Service Manager**: Central orchestrator that manages provider selection, failover, and request routing
+2. **Configuration Manager**: Handles provider configurations, API keys, and runtime settings
+3. **Provider Registry**: Maintains available providers and their health status
+4. **Health Monitor**: Continuously monitors provider availability and performance
+5. **Rate Limiter**: Manages request throttling and quota enforcement
+6. **Enhanced Provider Clients**: Improved implementations with retry logic and error handling
+
+## Components and Interfaces
+
+### Enhanced AIProvider Interface
+
+```typescript
+interface AIProvider {
+  name: string;
+  isAvailable(): Promise<boolean>;
+  getHealthStatus(): ProviderHealthStatus;
+  generateExplanation(request: ExplanationRequest): Promise<ExplanationResponse>;
+  validateConfiguration(): boolean;
+}
+
+interface ExplanationRequest {
+  question: string;
+  correctAnswers: string[];
+  apiKey?: string;
+  options?: RequestOptions;
+}
+
+interface ExplanationResponse {
+  explanation: string;
+  provider: string;
+  metadata: ResponseMetadata;
+}
+
+interface ProviderHealthStatus {
+  isHealthy: boolean;
+  lastChecked: Date;
+  responseTime: number;
+  errorRate: number;
+  rateLimitStatus: RateLimitInfo;
+}
+```
+
+### Configuration Management
+
+```typescript
+interface ProviderConfig {
+  name: string;
+  enabled: boolean;
+  priority: number;
+  apiKey?: string;
+  baseUrl?: string;
+  timeout: number;
+  retryAttempts: number;
+  rateLimits: RateLimitConfig;
+}
+
+interface RateLimitConfig {
+  requestsPerMinute: number;
+  requestsPerHour: number;
+  requestsPerDay: number;
+  burstLimit: number;
+}
+```
+
+### AI Service Manager
+
+The central service manager will implement intelligent provider selection and failover:
+
+```typescript
+class AIServiceManager {
+  private providers: Map<string, AIProvider>;
+  private healthMonitor: HealthMonitor;
+  private rateLimiter: RateLimiter;
+  private configManager: ConfigurationManager;
+
+  async generateExplanation(request: ExplanationRequest): Promise<ExplanationResponse> {
+    const availableProviders = await this.getAvailableProviders();
+    
+    for (const provider of availableProviders) {
+      try {
+        if (await this.rateLimiter.canMakeRequest(provider.name)) {
+          const response = await provider.generateExplanation(request);
+          await this.recordSuccess(provider.name);
+          return response;
+        }
+      } catch (error) {
+        await this.recordFailure(provider.name, error);
+        continue; // Try next provider
+      }
+    }
+    
+    throw new Error('All providers unavailable');
+  }
+}
+```
+
+## Data Models
+
+### Request/Response Models
+
+```typescript
+interface StandardizedRequest {
+  question: string;
+  correctAnswers: string[];
+  context?: string;
+  maxTokens?: number;
+  temperature?: number;
+  timeout?: number;
+}
+
+interface StandardizedResponse {
+  explanation: string;
+  provider: string;
+  processingTime: number;
+  tokensUsed?: number;
+  confidence?: number;
+  metadata: {
+    requestId: string;
+    timestamp: Date;
+    model?: string;
+    version?: string;
+  };
+}
+```
+
+### Provider-Specific Adapters
+
+Each provider will have an adapter that translates between the standardized format and provider-specific APIs:
+
+```typescript
+abstract class BaseProviderAdapter implements AIProvider {
+  protected config: ProviderConfig;
+  protected httpClient: HttpClient;
+  
+  abstract transformRequest(request: StandardizedRequest): any;
+  abstract transformResponse(response: any): StandardizedResponse;
+  abstract validateApiKey(apiKey: string): boolean;
+}
+```
+
+## Error Handling
+
+### Error Classification
+
+```typescript
+enum ErrorType {
+  AUTHENTICATION = 'authentication',
+  RATE_LIMIT = 'rate_limit',
+  NETWORK = 'network',
+  VALIDATION = 'validation',
+  PROVIDER_ERROR = 'provider_error',
+  TIMEOUT = 'timeout'
+}
+
+interface APIError {
+  type: ErrorType;
+  message: string;
+  provider: string;
+  retryable: boolean;
+  retryAfter?: number;
+  originalError?: any;
+}
+```
+
+### Retry Strategy
+
+```typescript
+class RetryStrategy {
+  async executeWithRetry<T>(
+    operation: () => Promise<T>,
+    config: RetryConfig
+  ): Promise<T> {
+    let lastError: Error;
+    
+    for (let attempt = 1; attempt <= config.maxAttempts; attempt++) {
+      try {
+        return await operation();
+      } catch (error) {
+        lastError = error;
+        
+        if (!this.isRetryable(error) || attempt === config.maxAttempts) {
+          throw error;
+        }
+        
+        const delay = this.calculateBackoff(attempt, config);
+        await this.sleep(delay);
+      }
+    }
+    
+    throw lastError;
+  }
+}
+```
+
+### Circuit Breaker Pattern
+
+```typescript
+class CircuitBreaker {
+  private state: 'CLOSED' | 'OPEN' | 'HALF_OPEN' = 'CLOSED';
+  private failureCount = 0;
+  private lastFailureTime?: Date;
+  
+  async execute<T>(operation: () => Promise<T>): Promise<T> {
+    if (this.state === 'OPEN') {
+      if (this.shouldAttemptReset()) {
+        this.state = 'HALF_OPEN';
+      } else {
+        throw new Error('Circuit breaker is OPEN');
+      }
+    }
+    
+    try {
+      const result = await operation();
+      this.onSuccess();
+      return result;
+    } catch (error) {
+      this.onFailure();
+      throw error;
+    }
+  }
+}
+```
+
+## Testing Strategy
+
+### Integration Testing Framework
+
+```typescript
+interface ProviderTestSuite {
+  testConnectivity(): Promise<TestResult>;
+  testAuthentication(): Promise<TestResult>;
+  testRequestResponse(): Promise<TestResult>;
+  testErrorHandling(): Promise<TestResult>;
+  testRateLimiting(): Promise<TestResult>;
+}
+
+class AIProviderTester {
+  async runFullTestSuite(provider: AIProvider): Promise<TestReport> {
+    const results = await Promise.all([
+      this.testBasicFunctionality(provider),
+      this.testErrorScenarios(provider),
+      this.testPerformance(provider)
+    ]);
+    
+    return this.generateReport(results);
+  }
+}
+```
+
+### Mock Provider for Testing
+
+```typescript
+class MockAIProvider implements AIProvider {
+  private shouldFail = false;
+  private responseDelay = 0;
+  
+  async generateExplanation(request: ExplanationRequest): Promise<ExplanationResponse> {
+    if (this.shouldFail) {
+      throw new Error('Mock provider failure');
+    }
+    
+    await this.sleep(this.responseDelay);
+    
+    return {
+      explanation: `Mock explanation for: ${request.question}`,
+      provider: 'mock',
+      metadata: {
+        requestId: 'mock-' + Date.now(),
+        timestamp: new Date(),
+        processingTime: this.responseDelay
+      }
+    };
+  }
+}
+```
+
+### Performance Monitoring
+
+```typescript
+interface PerformanceMetrics {
+  averageResponseTime: number;
+  successRate: number;
+  errorRate: number;
+  throughput: number;
+  p95ResponseTime: number;
+  p99ResponseTime: number;
+}
+
+class MetricsCollector {
+  async recordRequest(provider: string, duration: number, success: boolean): Promise<void> {
+    // Record metrics for monitoring and alerting
+  }
+  
+  async getProviderMetrics(provider: string, timeRange: TimeRange): Promise<PerformanceMetrics> {
+    // Retrieve aggregated metrics
+  }
+}
+```
+
+## Security Considerations
+
+### API Key Management
+
+- API keys stored securely in environment variables
+- Key rotation support with graceful fallback
+- Validation of key formats before use
+- Audit logging of key usage
+
+### Request Validation
+
+- Input sanitization for all user-provided content
+- Request size limits to prevent abuse
+- Rate limiting per user/IP to prevent DoS
+- Response content filtering for safety
+
+### Data Privacy
+
+- No storage of user questions or AI responses
+- Minimal logging of request metadata
+- Compliance with data protection regulations
+- Secure transmission of all API communications
+
+## Deployment and Configuration
+
+### Environment Configuration
+
+```typescript
+interface DeploymentConfig {
+  providers: {
+    [key: string]: ProviderConfig;
+  };
+  rateLimits: GlobalRateLimits;
+  monitoring: MonitoringConfig;
+  security: SecurityConfig;
+}
+```
+
+### Health Checks
+
+- Endpoint for overall system health
+- Individual provider health status
+- Dependency health monitoring
+- Automated alerting on failures
+
+This design provides a robust, scalable foundation for API integrations while maintaining the simplicity of the existing interface. The modular architecture allows for easy addition of new providers and features while ensuring reliability and performance.