'use strict';
const moment = require('moment');
const { reportFastgptResponse } = require('../services/dashboardReporter');

// 从运行时上下文中获取额度/计费服务实例。
const getQuotaService = (ctx) => ctx?.app?.fs?.quotaBillingService;

// 记录一次生成请求的 token 使用量，并按规则完成免费判定与扣费结算。
const trackGenerateUsage = async (ctx, {
   creator,
   docKind,
   docId,
   chapterKey = null,
   responseBody,
   analyticsApplicationId = '',
   analyticsAppKey = '',
   ignoreCreateFree = false,
   allowChapterFirstFree = true,
}) => {
   try {
      const quotaService = getQuotaService(ctx);
      if (!quotaService || !docKind) return;
      const userId = quotaService.normalizeUserId(creator);
      const normalizedDocId = Number(docId);
      if (!userId || !Number.isFinite(normalizedDocId) || normalizedDocId <= 0) return;

      const usage = quotaService.toUsageFromResponse(responseBody || {});
      let billingStatus = quotaService.BILLING_STATUS.SKIP;
      let amountYuan = 0;
      let requestId = null;
      const docIsCreateFree = ignoreCreateFree
         ? false
         : await quotaService.isDocGenerateBillingExemptByCreate({
            userId,
            docId: normalizedDocId,
            docKind,
         });

      // 仅在存在有效 token 消耗时进入计费流程。
      if (usage.totalTokens > 0 && !docIsCreateFree) {
         let isFree = false;
         // 章节级首免：首次生成不扣费，仅记录免费状态。
         if (chapterKey && allowChapterFirstFree) {
            isFree = await quotaService.markChapterFirstFree({
               userId,
               docId: normalizedDocId,
               chapterKey: String(chapterKey),
            });
         }
         if (isFree) {
            billingStatus = quotaService.BILLING_STATUS.FREE;
         } else {
            billingStatus = quotaService.BILLING_STATUS.PENDING;
            amountYuan = quotaService.calculateAmountYuan(usage.totalTokens);
            requestId = quotaService.createRequestId({
               userId,
               docKind,
               docId: normalizedDocId,
               chapterKey: chapterKey ? String(chapterKey) : '',
            });
         }
      }

      const eventId = await quotaService.recordGenerateEvent({
         userId,
         docId: normalizedDocId,
         docKind,
         chapterKey: chapterKey ? String(chapterKey) : null,
         usage,
         billingStatus,
         amountYuan,
         requestId,
      });

      // 仅对待结算记录执行实际扣费，避免重复计费。
      if (billingStatus === quotaService.BILLING_STATUS.PENDING && eventId) {
         const aideductUserId = await quotaService.resolveChargeUserId({
            userId,
            externalUserId: ctx?.fs?.userIdMapping?.externalUserId || '',
         });
         await quotaService.settleGenerateBilling({
            eventId,
            aideductUserId,
            amountYuan,
            requestId,
            logger: ctx.logger,
         });
      }

      if (analyticsApplicationId && responseBody) {
         await reportFastgptResponse({
            ctx,
            applicationId: analyticsApplicationId,
            actionId: `quota:${docKind}:${normalizedDocId}:${chapterKey || eventId || Date.now()}`,
            responseBody,
            appKey: analyticsAppKey,
            userId,
            // Full-document generation reports one business call after all
            // chapters succeed; individual chapter responses only carry usage.
            includeCall: !chapterKey,
         });
      }
   } catch (error) {
      ctx?.logger?.log?.(error);
   }
};

// 写入 AI 查询日志（用于行为追踪与审计），支持复用外部事务。
const recordAiQueryLog = async (ctx, {
   userId,
   ipAddress,
   feature,
   clientId = 'pep-feixiaoshang',
   time = null,
   transaction = null,
}) => {
   try {
      const models = ctx?.app?.fs?.dc?.models;
      if (!models?.AiQueryRecord || !userId || !feature) return;

      const createOptions = transaction ? { transaction } : undefined;
      const payload = {
         userId,
         ipAddress,
         clientId,
         feature,
         time: time || moment(),
      };
      await models.AiQueryRecord.create(payload, createOptions);
   } catch (error) {
      ctx?.logger?.log?.(error);
   }
};

module.exports = {
   getQuotaService,
   trackGenerateUsage,
   recordAiQueryLog,
};