system-prompts-and-models-of-ai-tools/Nowhere_AI_Agent/backend/src/voice/voice-processor.ts

import { Logger } from '../utils/logger';

export interface VoiceCommand {
  text: string;
  confidence: number;
  intent: string;
  entities: any[];
}

export interface VoiceResponse {
  text: string;
  audio?: Buffer;
  mode: 'brief' | 'detailed' | 'silent' | 'interactive';
}

export interface VoiceSettings {
  enabled: boolean;
  language: string;
  voice: string;
  speed: number;
  volume: number;
}

export class VoiceProcessor {
  private logger: Logger;
  private settings: VoiceSettings;
  private isListening: boolean = false;

  constructor() {
    this.logger = new Logger('VoiceProcessor');
    this.settings = {
      enabled: true,
      language: 'en-US',
      voice: 'default',
      speed: 1.0,
      volume: 1.0
    };
  }

  /**
   * Process voice input (speech recognition)
   */
  async processVoiceInput(audioData: Buffer): Promise<VoiceCommand> {
    try {
      this.logger.info('Processing voice input', { 
        audioSize: audioData.length,
        language: this.settings.language 
      });

      // Mock speech recognition - in real implementation would use Azure Speech Services
      const mockText = this.mockSpeechRecognition(audioData);
      const intent = await this.analyzeVoiceIntent(mockText);
      const entities = await this.extractVoiceEntities(mockText);

      const command: VoiceCommand = {
        text: mockText,
        confidence: 0.85,
        intent: intent.type,
        entities
      };

      this.logger.info('Voice command processed', { 
        text: command.text, 
        intent: command.intent,
        confidence: command.confidence 
      });

      return command;

    } catch (error) {
      this.logger.error('Voice processing failed', { error: error.message });
      throw new Error(`Voice processing failed: ${error.message}`);
    }
  }

  /**
   * Generate voice response (text-to-speech)
   */
  async generateVoiceResponse(response: VoiceResponse): Promise<Buffer> {
    try {
      this.logger.info('Generating voice response', { 
        text: response.text.substring(0, 50) + '...',
        mode: response.mode 
      });

      // Mock TTS - in real implementation would use Azure Speech Services
      const audioBuffer = this.mockTextToSpeech(response.text, this.settings);

      this.logger.info('Voice response generated', { 
        audioSize: audioBuffer.length,
        textLength: response.text.length 
      });

      return audioBuffer;

    } catch (error) {
      this.logger.error('Voice response generation failed', { error: error.message });
      throw new Error(`Voice response generation failed: ${error.message}`);
    }
  }

  /**
   * Process voice command from text
   */
  async processVoiceCommand(command: any): Promise<any> {
    try {
      this.logger.info('Processing voice command', { command });

      // Parse voice command and convert to action
      const action = await this.parseVoiceCommand(command);
      
      return {
        success: true,
        message: 'Voice command processed successfully',
        data: action
      };

    } catch (error) {
      this.logger.error('Voice command processing failed', { error: error.message });
      return {
        success: false,
        message: 'Voice command processing failed',
        error: error.message
      };
    }
  }

  /**
   * Start voice listening mode
   */
  async startListening(): Promise<void> {
    if (this.isListening) {
      throw new Error('Already listening');
    }

    this.isListening = true;
    this.logger.info('Voice listening started');
  }

  /**
   * Stop voice listening mode
   */
  async stopListening(): Promise<void> {
    if (!this.isListening) {
      throw new Error('Not currently listening');
    }

    this.isListening = false;
    this.logger.info('Voice listening stopped');
  }

  /**
   * Update voice settings
   */
  async updateSettings(settings: Partial<VoiceSettings>): Promise<void> {
    this.settings = { ...this.settings, ...settings };
    this.logger.info('Voice settings updated', { settings: this.settings });
  }

  /**
   * Get voice processor status
   */
  async getStatus(): Promise<any> {
    return {
      enabled: this.settings.enabled,
      listening: this.isListening,
      settings: this.settings,
      lastUpdated: new Date().toISOString()
    };
  }

  // Private helper methods

  private mockSpeechRecognition(audioData: Buffer): string {
    // Mock speech recognition - in real implementation would use Azure Speech Services
    const mockResponses = [
      'Nowhere, analyze this code',
      'Create a new React component',
      'Search for documentation',
      'Enable autopilot mode',
      'What do you remember from our conversation?',
      'Run the tests and show me the results'
    ];

    // Use audio data hash to deterministically select a response
    const hash = this.simpleHash(audioData);
    const index = hash % mockResponses.length;
    
    return mockResponses[index];
  }

  private async analyzeVoiceIntent(text: string): Promise<any> {
    // Mock intent analysis - in real implementation would use NLP
    const intents = {
      'analyze': 'code_analysis',
      'create': 'file_operation',
      'search': 'web_search',
      'autopilot': 'autopilot_toggle',
      'remember': 'memory_query',
      'run': 'terminal_command',
      'test': 'terminal_command'
    };

    const words = text.toLowerCase().split(' ');
    for (const word of words) {
      if (intents[word]) {
        return { type: intents[word], confidence: 0.9 };
      }
    }

    return { type: 'general', confidence: 0.5 };
  }

  private async extractVoiceEntities(text: string): Promise<any[]> {
    // Mock entity extraction - in real implementation would use NLP
    const entities: any[] = [];

    // Extract file names
    const fileMatch = text.match(/(\w+\.\w+)/);
    if (fileMatch) {
      entities.push({
        type: 'file',
        value: fileMatch[1],
        confidence: 0.8
      });
    }

    // Extract commands
    const commandMatch = text.match(/run\s+(.+)/i);
    if (commandMatch) {
      entities.push({
        type: 'command',
        value: commandMatch[1],
        confidence: 0.7
      });
    }

    // Extract search queries
    const searchMatch = text.match(/search\s+(.+)/i);
    if (searchMatch) {
      entities.push({
        type: 'query',
        value: searchMatch[1],
        confidence: 0.8
      });
    }

    return entities;
  }

  private async parseVoiceCommand(command: any): Promise<any> {
    // Convert voice command to executable action
    const { intent, entities } = command;

    switch (intent) {
      case 'code_analysis':
        return {
          action: 'analyze_code',
          target: entities.find(e => e.type === 'file')?.value || 'current'
        };

      case 'file_operation':
        return {
          action: 'create_file',
          target: entities.find(e => e.type === 'file')?.value || 'new_file'
        };

      case 'web_search':
        return {
          action: 'search_web',
          query: entities.find(e => e.type === 'query')?.value || 'general'
        };

      case 'autopilot_toggle':
        return {
          action: 'toggle_autopilot',
          enabled: true
        };

      case 'memory_query':
        return {
          action: 'query_memory',
          query: 'recent interactions'
        };

      case 'terminal_command':
        return {
          action: 'execute_command',
          command: entities.find(e => e.type === 'command')?.value || 'ls'
        };

      default:
        return {
          action: 'general_response',
          message: 'I heard your command, let me help you with that.'
        };
    }
  }

  private mockTextToSpeech(text: string, settings: VoiceSettings): Buffer {
    // Mock TTS - in real implementation would use Azure Speech Services
    // For now, return a mock audio buffer
    const mockAudio = Buffer.alloc(1024);
    mockAudio.fill(0); // Silent audio buffer
    
    return mockAudio;
  }

  private simpleHash(buffer: Buffer): number {
    let hash = 0;
    for (let i = 0; i < Math.min(buffer.length, 100); i++) {
      hash = ((hash << 5) - hash) + buffer[i];
      hash = hash & hash; // Convert to 32-bit integer
    }
    return Math.abs(hash);
  }
}