import { Injectable } from '@nestjs/common';
import { LearningActivityRepository } from './learning-activity.repository';

@Injectable()
export class LearningActivityService {
  constructor(private readonly repository: LearningActivityRepository) {}

  async getHeatmap(): Promise<Record<string, number>> {
    const activities = await this.repository.findAll();
    const heatmap: Record<string, number> = {};
    for (const a of activities) {
      heatmap[a.date] = a.minutes;
    }
    return heatmap;
  }

  async getSummary() {
    const activities = await this.repository.findAll();
    const totalMinutes = activities.reduce((s, a) => s + a.minutes, 0);
    const totalCards = activities.reduce((s, a) => s + a.cardsReviewed, 0);
    const activeDays = activities.filter((a) => a.minutes > 0).length;
    const dailyAverage = activeDays > 0 ? Math.round(totalMinutes / activeDays) : 0;
    return { totalMinutes, totalCardsReviewed: totalCards, activeDays, dailyAverage };
  }
}