# All files / modules/tts mock.provider.ts

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     import fs from 'fs';
    import path from 'path';
    import { VoiceParams } from '../../types';
    import { ITtsProvider } from './provider.interface';
    import { logAiCall } from '../../services/ai-call-logger';

    // 模拟 TTS Provider（不调任何外部API，直接返回占位音频）
    export class MockTtsProvider implements ITtsProvider {
      readonly name = 'mock-tts';
      readonly vendor = 'mock';
      readonly mode = 'mock' as const;
      readonly maxTextLength = 10000;
      readonly concurrency = 2;
      readonly modelId = 'mock-tts';
      readonly ttsApiPath = '';

      async synthesize(
        text: string,
        voiceId: string,
        params: VoiceParams,
        outputPath: string
      ): Promise<string> {
        const startTime = Date.now();
        // 随机 40% 失败率，用于测试 TtsQueue 重试机制
        const shouldFail = Math.random() < 0.4;

        try {
          if (shouldFail) {
            throw new Error('Mock 模拟失败：测试重试机制');
          }

          const dir = path.dirname(outputPath);
          if (!fs.existsSync(dir)) {
            fs.mkdirSync(dir, { recursive: true });
          }

          const minimalMp3 = Buffer.from([
            0xff, 0xfb, 0x90, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00,
          ]);
          fs.writeFileSync(outputPath, minimalMp3);

          logAiCall({
            callType: 'tts_mock',
            provider: 'mock',
            model: 'mock-tts',
            textLen: text.length,
            duration: Date.now() - startTime,
            success: true,
          });

          return outputPath;
        } catch (error: any) {
          logAiCall({
            callType: 'tts_mock',
            provider: 'mock',
            model: 'mock-tts',
            textLen: text.length,
            duration: Date.now() - startTime,
            success: false,
            errorMsg: error.message,
          });
          throw error;
        }
      }
    }