// Next.js API route support: https://nextjs.org/docs/api-routes/introduction
import type { NextApiRequest, NextApiResponse } from "next";
import { app } from "@/firebase";
import {
  getFirestore,
  collection,
  getDocs,
  setDoc,
  doc,
  query,
  where,
} from "firebase/firestore";
import { withIronSessionApiRoute } from "iron-session/next";
import { sessionOptions } from "@/lib/session";
import { Group } from "@/interfaces/user";
import { v4 } from "uuid";
import { updateExpiryDateOnGroup } from "@/utils/groups.be";

const db = getFirestore(app);

export default withIronSessionApiRoute(handler, sessionOptions);

async function handler(req: NextApiRequest, res: NextApiResponse) {
  if (!req.session.user) {
    res.status(401).json({ ok: false });
    return;
  }

  if (req.method === "GET") await get(req, res);
  if (req.method === "POST") await post(req, res);
}

async function get(req: NextApiRequest, res: NextApiResponse) {
  const { admin, participant } = req.query as {
    admin: string;
    participant: string;
  };

  const queryConstraints = [
    ...(admin ? [where("admin", "==", admin)] : []),
    ...(participant
      ? [where("participants", "array-contains", participant)]
      : []),
  ];
  const snapshot = await getDocs(
    queryConstraints.length > 0
      ? query(collection(db, "groups"), ...queryConstraints)
      : collection(db, "groups"),
  );
  const groups = snapshot.docs.map((doc) => ({
    id: doc.id,
    ...doc.data(),
  })) as Group[];

  res.status(200).json(groups);
}

async function post(req: NextApiRequest, res: NextApiResponse) {
  const body = req.body as Group;

  await Promise.all(
    body.participants.map(
      async (p) => await updateExpiryDateOnGroup(p, body.admin),
    ),
  );

  await setDoc(doc(db, "groups", v4()), {
    name: body.name,
    admin: body.admin,
    participants: body.participants,
  });
  res.status(200).json({ ok: true });
}