function writeToAlgolia(object, indexName, operation) {

	const ALGOLIA_ID = functions.config().algolia.app_id;
	const ALGOLIA_ADMIN_KEY = functions.config().algolia.api_key;
	const client = algoliasearch(ALGOLIA_ID, ALGOLIA_ADMIN_KEY);
	const index = client.initIndex(indexName);

	switch(operation) {

		case 'create':
			return new Promise((resolve, reject) => {
				index.addObject(object)
				.then(res => { console.log('res GOOD', res); resolve(res) })
				.catch(err => { console.log('err BAD', err); reject(err) });
			});

		case 'update':
			return new Promise((resolve, reject) => {
				index.saveObject(object)
				.then(res => { console.log('res GOOD', res); resolve(res) })
				.catch(err => { console.log('err BAD', err); reject(err) });
			});

		case 'delete':
			return new Promise((resolve, reject) => {
				index.deleteObject(object.objectID)
				.then(res => { console.log('res GOOD', res); resolve(res) })
				.catch(err => { console.log('err BAD', err); reject(err) });
			});
	}

}

exports.syncEquipmentToAlgolia =
functions
.firestore
.document('equipment/{document}')
.onWrite((change, context) => {

	let operation = '';
	let data = change.after.data();

	if (!change.before.exists) operation = 'create';
	else if (!change.after.exists) operation = 'delete';
	else operation = 'update';

	if (data === null) {
		data = { objectID: context.params.document }
	} else {
		data = {
			...data,
			objectID: context.params.document
		}
	}

	return writeToAlgolia(data, 'equipment', operation)
	.then(res => console.log(`SUCCESS: ${operation}`, res))
	.catch(err => console.log(`ERROR: ${operation}`, err));

});