// methods to add and remove users from MailChimp lists

import Users from 'meteor/nova:users';
import MailChimp from './mailchimp_api.js';

const MailChimpList = {};

MailChimpList.add = function(userOrEmail, confirm, done){

  var apiKey = Telescope.settings.get('mailChimpAPIKey');
  var listId = Telescope.settings.get('mailChimpListId');

  var user, email;

  confirm = (typeof confirm === 'undefined') ? false : confirm; // default to no confirmation

  // not sure if it's really necessary that the function take both user and email?
  if (typeof userOrEmail === "string") {
    user = null;
    email = userOrEmail;
  } else if (typeof userOrEmail === "object") {
    user = userOrEmail;
    email = Users.getEmail(user);
    if (!email)
      throw 'User must have an email address';
  }

  // add a user to a MailChimp list.
  // called when a new user is created, or when an existing user fills in their email
  if(!!apiKey && !!listId){

    try {

      console.log('// Adding "'+email+'" to MailChimp list…');

      var api = new MailChimp(apiKey);
      var subscribeOptions = {
        id: listId,
        email: {"email": email},
        double_optin: confirm
      };

      // subscribe user
      var subscribe = api.call('lists', 'subscribe', subscribeOptions);

      // mark user as subscribed
      if (!!user) {
        Users.methods.setSetting(user._id, 'newsletter_subscribeToNewsletter', true);
      }

      console.log("// User subscribed");

      return subscribe;

    } catch (error) {
      throw new Meteor.Error("subscription-failed", error.message);
    }
  } else {
    throw new Meteor.Error("Please provide your MailChimp API key and list ID", error.message);
  }
};

MailChimpList.remove = (user) => {
  const apiKey = Telescope.settings.get('mailChimpAPIKey');
  const listId = Telescope.settings.get('mailChimpListId');

  const email = Users.getEmail(user);
  if (!email) {
    throw 'User must have an email address';
  }

  // remove a user to a MailChimp list.
  // called from the user's account
  if(!!apiKey && !!listId){

    try {

      console.log('// Removing "'+email+'" to MailChimp list…');

      var api = new MailChimp(apiKey);
      var subscribeOptions = {
        id: listId,
        email: {"email": email},
        delete_member: true // delete the member from the list to make it possible for him to *resubscribe* via API (mailchimp's spam prevention policy)
      };

      // unsubscribe user
      var subscribe = api.call('lists', 'unsubscribe', subscribeOptions);

      // mark user as unsubscribed
      Users.methods.setSetting(user._id, 'newsletter_subscribeToNewsletter', false);

      console.log("// User unsubscribed");

      return subscribe;

    } catch (error) {
      throw new Meteor.Error("unsubscription-failed", error.message);
    }
  } else {
    throw new Meteor.Error("Please provide your MailChimp API key and list ID", error.message);
  }
};

export default MailChimpList;