el.xwx.moe/lib/client/addMemberToCollection.ts

import { CollectionIncludingMembersAndLinkCount, Member } from "@/types/global";
import getPublicUserDataByEmail from "./getPublicUserDataByEmail";
import { toast } from "react-hot-toast";

const addMemberToCollection = async (
  ownerEmail: string,
  memberEmail: string,
  collection: CollectionIncludingMembersAndLinkCount,
  setMember: (newMember: Member) => null | undefined
) => {
  const checkIfMemberAlreadyExists = collection.members.find((e) => {
    const email = e.user.email.toLowerCase();
    return email === memberEmail.toLowerCase();
  });

  if (
    // no duplicate members
    !checkIfMemberAlreadyExists &&
    // member can't be empty
    memberEmail.trim() !== "" &&
    // member can't be the owner
    memberEmail.trim() !== ownerEmail
  ) {
    // Lookup, get data/err, list ...
    const user = await getPublicUserDataByEmail(
      memberEmail.trim().toLowerCase()
    );

    if (user.email) {
      setMember({
        collectionId: collection.id,
        userId: user.id,
        canCreate: false,
        canUpdate: false,
        canDelete: false,
        user: {
          name: user.name,
          email: user.email,
        },
      });
    }
  } else if (checkIfMemberAlreadyExists) toast.error("User already exists.");
  else if (memberEmail.trim() === ownerEmail)
    toast.error("You are already the collection owner.");
};

export default addMemberToCollection;