const admin = require("firebase-admin");
const { onDocumentDeleted } = require("firebase-functions/firestore");
const { refList } = require("../index");
const { deleteFolder } = require("../helpers/firebase");

exports.onUserDelete = onDocumentDeleted("users/{userID}", async (event) => {
  try {
    const userID = event?.params?.userID;
    await clearAllUserData(userID);

    await deleteFolder(`users/${userID}/`);

    await admin.auth().deleteUser(userID);
    console.log(`User ${userID} deleted successfully`);
  } catch (e) {
    console.log(e);
  }
});

async function clearAllUserData(userID) {
  const deleteAll = async (ref, key, operator = "==") => {
    const snapshot = await ref.where(key, operator, userID).get();
    snapshot.forEach((item) => item.ref.delete());
  };
  const removeFromArray = async (ref, arrayName) => {
    const snapshot = await ref.where(arrayName, "array-contains", userID).get();
    snapshot.forEach((item) =>
      item.ref.update({
        [arrayName]: admin.firestore.FieldValue.arrayRemove(userID),
      }),
    );
  };

  await deleteAll(refList.projects, "userId");
  await deleteAll(refList.playlists, "createdBy");
}