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

@Injectable()
export class VoiceService {
  private readonly voiceServiceUrl: string;

  constructor(private configService: ConfigService) {
    const voiceServiceHost = this.configService.get<string>('VOICE_SERVICE_HOST');
    
    if (!voiceServiceHost) {
      throw new Error('VOICE_SERVICE_HOST environment variable is not set');
    }
    
    this.voiceServiceUrl = voiceServiceHost;
  }

  async generateTTS(text: string, voice: string = 'sarah'): Promise<Buffer> {
    try {
      const url = `${this.voiceServiceUrl}/api/voice/tts`;
      const response = await fetch(url, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({ text, voice }),
      });

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

      const arrayBuffer = await response.arrayBuffer();
      return Buffer.from(arrayBuffer);
    } catch (error) {
      if (error instanceof HttpException) {
        throw error;
      }
      throw new HttpException(
        `Failed to generate speech: ${error.message}`,
        HttpStatus.INTERNAL_SERVER_ERROR,
      );
    }
  }

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

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

      const arrayBuffer = await response.arrayBuffer();
      return Buffer.from(arrayBuffer);
    } catch (error) {
      if (error instanceof HttpException) {
        throw error;
      }
      throw new HttpException(
        `Failed to get sound effect: ${error.message}`,
        HttpStatus.INTERNAL_SERVER_ERROR,
      );
    }
  }
}