All files / src/platform/analytics analytics.service.ts

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import { Injectable, Logger } from '@nestjs/common';
import { InjectModel } from '@nestjs/mongoose';
import { Model } from 'mongoose';
import { SaaSMonthlyMetric } from './schemas/analytics.schema';
import {
  Subscription,
  SubscriptionHistory,
} from '../subscriptions/schemas/subscription.schema';
import {
  PlanPrice,
  SubscriptionPlanVersion,
} from '../subscriptions/schemas/subscription-plan.schema';
import { Cron, CronExpression } from '@nestjs/schedule';
 
@Injectable()
export class SaaSAnalyticsService {
  private readonly logger = new Logger(SaaSAnalyticsService.name);
 
  constructor(
    @InjectModel(SaaSMonthlyMetric.name)
    private readonly metricModel: Model<SaaSMonthlyMetric>,
    @InjectModel(Subscription.name)
    private readonly subscriptionModel: Model<Subscription>,
    @InjectModel(SubscriptionHistory.name)
    private readonly subscriptionHistoryModel: Model<SubscriptionHistory>,
    @InjectModel(PlanPrice.name)
    private readonly planPriceModel: Model<PlanPrice>,
    @InjectModel(SubscriptionPlanVersion.name)
    private readonly planVersionModel: Model<SubscriptionPlanVersion>,
  ) {}
 
  @Cron(CronExpression.EVERY_DAY_AT_MIDNIGHT)
  async generateDailyRollup() {
    const monthKey = new Date().toISOString().substring(0, 7); // e.g. 2026-07
    this.logger.log(`Starting SaaS metric rollup for ${monthKey}`);
 
    const activeSubscriptions = await this.subscriptionModel
      .find({ status: 'active' })
      .exec();
 
    let totalMrr = 0;
    const planPrices = new Map<string, number>();
 
    for (const sub of activeSubscriptions) {
      if (!planPrices.has(sub.planVersionId)) {
        const price = await this.planPriceModel
          .findOne({
            planVersionId: sub.planVersionId,
            billingCycle: 'monthly',
            isActive: true,
          })
          .exec();
 
        if (!price) {
          const yearlyPrice = await this.planPriceModel
            .findOne({
              planVersionId: sub.planVersionId,
              billingCycle: 'yearly',
              isActive: true,
            })
            .exec();
 
          if (yearlyPrice) {
            planPrices.set(
              sub.planVersionId,
              Math.floor(yearlyPrice.amount / 12),
            );
          } else {
            planPrices.set(sub.planVersionId, 0);
          }
        } else {
          planPrices.set(sub.planVersionId, price.amount);
        }
      }
      totalMrr += planPrices.get(sub.planVersionId) || 0;
    }
 
    const arr = totalMrr * 12;
    const activeSubscribersCount = activeSubscriptions.length;
 
    const startOfMonth = new Date(
      new Date().getFullYear(),
      new Date().getMonth(),
      1,
    );
 
    const cancelledCount = await this.subscriptionModel
      .countDocuments({
        status: 'cancelled',
        cancelledAt: { $gte: startOfMonth },
      })
      .exec();
 
    const newSubsCount = await this.subscriptionModel
      .countDocuments({
        createdAt: { $gte: startOfMonth },
      })
      .exec();
 
    let churnRate = 0;
    const totalAtStart = activeSubscribersCount + cancelledCount - newSubsCount;
    if (totalAtStart > 0) {
      churnRate = (cancelledCount / totalAtStart) * 100;
    }
 
    await this.metricModel
      .findOneAndUpdate(
        { monthKey },
        {
          $set: {
            mrr: totalMrr,
            arr,
            activeSubscribers: activeSubscribersCount,
            churnRate: parseFloat(churnRate.toFixed(2)),
            newSubscribers: newSubsCount,
            cancelledSubscribers: cancelledCount,
          },
        },
        { upsert: true, new: true },
      )
      .exec();
 
    this.logger.log(
      `SaaS metric rollup completed for ${monthKey}: MRR=${totalMrr}, ARR=${arr}`,
    );
  }
 
  async getMetrics(monthKey: string): Promise<any> {
    return this.metricModel.findOne({ monthKey }).lean().exec();
  }
 
  async getHistoricalMetrics(limit: number = 12): Promise<any[]> {
    return this.metricModel
      .find()
      .sort({ monthKey: -1 })
      .limit(limit)
      .lean()
      .exec();
  }
}