# All files / services ai-call-logger.ts

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     /**
     * AI 调用日志 —— 记录每次大模型 / TTS API 请求，方便对账
     *
     * 写入策略：fire-and-forget，不阻塞业务请求
     */

    import { prisma } from '../models';

    export interface LogCallParams {
      callType: string;    // tts_create | tts_poll | tts_download | llm_chat | llm_tools
      provider: string;    // minimax | bailian | volcengine
      model: string;       // speech-2.8-hd | qwen3-tts-instruct-flash | MiniMax-M2.7
      textLen?: number;
      prompt?: string;     // 提示词内容
      tokenCount?: number;
      duration?: number;
      success?: boolean;
      errorMsg?: string;
      bookId?: number;
      chapterId?: number;
    }

    /**
     * 记录一次 AI 调用（异步写入，不阻塞）
     */
    export function logAiCall(params: LogCallParams): void {
      // Always log to console so we know it was called
      console.log(`[AiCallLog] ${params.callType} | ${params.provider} | ${params.model} | ${params.success ? 'OK' : 'FAIL'} | ${params.textLen || 0}字`);

      prisma.aiCallLog.create({
        data: {
          callType: params.callType,
          provider: params.provider,
          model: params.model,
          textLen: params.textLen ?? 0,
          prompt: params.prompt ?? null,
          duration: params.duration ?? 0,
          success: params.success ?? true,
          errorMsg: params.errorMsg?.substring(0, 200) ?? null,
          bookId: params.bookId ?? null,
          chapterId: params.chapterId ?? null,
        },
      }).then(result => {
        // Successfully written
      }).catch(err => {
        console.error('[AiCallLog] ❌ 写入数据库失败:', err.message);
      });
    }

    /**
     * 包装异步函数，自动计时 + 记录日志
     *
     * 用法：
     *   const result = await withAiLog(
     *     () => axios.post(url, body),
     *     { callType: 'tts_create', provider: 'minimax', model: 'speech-2.8-hd', textLen: 1000 }
     *   );
     */
    export async function withAiLog<T>(
      fn: () => Promise<T>,
      params: LogCallParams,
    ): Promise<T> {
      const t0 = Date.now();
      try {
        const result = await fn();
        logAiCall({ ...params, duration: Date.now() - t0 });
        return result;
      } catch (err: any) {
        logAiCall({ ...params, duration: Date.now() - t0, success: false, errorMsg: err.message });
        throw err;
      }
    }