import $ from 'cafy'; import ID from '../../../../../cafy-id';
import UserList from '../../../../../models/user-list';
import User from '../../../../../models/user';

/**
 * Add a user to a user list
 */
module.exports = async (params, me) => new Promise(async (res, rej) => {
	// Get 'listId' parameter
	const [listId, listIdErr] = $(params.listId).type(ID).$;
	if (listIdErr) return rej('invalid listId param');

	// Fetch the list
	const userList = await UserList.findOne({
		_id: listId,
		userId: me._id,
	});

	if (userList == null) {
		return rej('list not found');
	}

	// Get 'userId' parameter
	const [userId, userIdErr] = $(params.userId).type(ID).$;
	if (userIdErr) return rej('invalid userId param');

	// Fetch the user
	const user = await User.findOne({
		_id: userId
	});

	if (user == null) {
		return rej('user not found');
	}

	if (userList.userIds.map(id => id.toHexString()).includes(user._id.toHexString())) {
		return rej('the user already added');
	}

	// Push the user
	await UserList.update({ _id: userList._id }, {
		$push: {
			userIds: user._id
		}
	});

	res();
});