import { Injectable, HttpException, HttpStatus, Logger } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';

@Injectable()
export class VoiceService {
  private readonly logger = new Logger(VoiceService.name);
  private readonly voiceServiceUrl: string;

  constructor(private configService: ConfigService) {
    this.logger.log('Initializing VoiceService...');
    var voiceServiceHost = this.configService.get<string>('VOICE_SERVICE_HOST');
    
    if (!voiceServiceHost) {
      const error = 'VOICE_SERVICE_HOST environment variable is not set';
      this.logger.error(error);
      throw new Error(error);
    }
    while (voiceServiceHost.endsWith('/')) {
      voiceServiceHost = voiceServiceHost.slice(0, -1);
    }
    
    this.voiceServiceUrl = voiceServiceHost;
    this.logger.log(`VoiceService initialized with URL: ${this.voiceServiceUrl}`);
  }

  async generateTTS(text: string, voice: string = 'sarah'): Promise<Buffer> {
    this.logger.log(`Generating TTS for text: "${text.substring(0, 50)}..." with voice: ${voice}`);
    try {
      const url = `${this.voiceServiceUrl}/api/voice/tts`;
      this.logger.debug(`Making request to: ${url}`);
      const response = await fetch(url, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({ text, voice }),
      });

      this.logger.debug(`Response status: ${response.status} ${response.statusText}`);

      if (!response.ok) {
        this.logger.error(`Voice service error: ${response.status} ${response.statusText}`);
        throw new HttpException(
          `Voice service error: ${response.statusText}`,
          response.status || HttpStatus.INTERNAL_SERVER_ERROR,
        );
      }

      const arrayBuffer = await response.arrayBuffer();
      const buffer = Buffer.from(arrayBuffer);
      this.logger.log(`TTS generated successfully, size: ${buffer.length} bytes`);
      return buffer;
    } catch (error) {
      if (error instanceof HttpException) {
        this.logger.error(`HttpException in generateTTS: ${error.message}`);
        throw error;
      }
      this.logger.error(`Error in generateTTS: ${error.message}`, error.stack);
      throw new HttpException(
        `Failed to generate speech: ${error.message}`,
        HttpStatus.INTERNAL_SERVER_ERROR,
      );
    }
  }

  async getEffect(effectType: string): Promise<Buffer> {
    this.logger.log(`Getting effect: ${effectType}`);
    try {
      const url = `${this.voiceServiceUrl}/api/voice/effects/${effectType}`;
      this.logger.debug(`Making request to: ${url}`);
      const response = await fetch(url, {
        method: 'GET',
      });

      this.logger.debug(`Response status: ${response.status} ${response.statusText}`);

      if (!response.ok) {
        this.logger.error(`Voice service error: ${response.status} ${response.statusText}`);
        throw new HttpException(
          `Voice service error: ${response.statusText}`,
          response.status || HttpStatus.INTERNAL_SERVER_ERROR,
        );
      }

      const arrayBuffer = await response.arrayBuffer();
      const buffer = Buffer.from(arrayBuffer);
      this.logger.log(`Effect retrieved successfully, size: ${buffer.length} bytes`);
      return buffer;
    } catch (error) {
      if (error instanceof HttpException) {
        this.logger.error(`HttpException in getEffect: ${error.message}`);
        throw error;
      }
      this.logger.error(`Error in getEffect: ${error.message}`, error.stack);
      throw new HttpException(
        `Failed to get sound effect: ${error.message}`,
        HttpStatus.INTERNAL_SERVER_ERROR,
      );
    }
  }
}