import {VercelRequest, VercelResponse} from '@vercel/node';
import {initializeApp, cert} from 'firebase-admin/app';
import {getFirestore} from 'firebase-admin/firestore';
import {firestore} from "firebase-admin";
import Timestamp = firestore.Timestamp;


export default async function generateDaily(req: VercelRequest, res: VercelResponse) {
    const serviceAccount = require('./serviceAccountKey.json');
    initializeApp({
        credential: cert(serviceAccount)
    })

    const firestore = getFirestore();

    const exercisesSnapshot = await firestore.collection('Exercises').get();
    const exercises: FirebaseFirestore.DocumentData[] = [];
    exercisesSnapshot.forEach((exercise) => {
        exercises.push(firestore.collection('Exercises').doc(exercise.id));
    });
    const shuffled = exercises.sort(() => 0.5 - Math.random());
    const selected = shuffled.slice(0, 3);
    const bonus = exercises[Math.floor(Math.random() * exercises.length)];

    const dailyChallengesRef = firestore.collection('DailyChallenges');
    const firestoreRes = await dailyChallengesRef.add({
        date: Timestamp.fromDate(new Date()),
        list_exercises: selected,
        bonus_exercise: bonus,
    })
    res.json(firestoreRes);
}