/*
 * Controller base actions
 *
 * This module contains base actions that follow
 * a template for CRUD operations on a DB and (optionally)
 * do custom things afterward to return a response.
 */

const validation = require(`../../validation`);
const db = require(`../../db`);

const createAction = async (req, res, config) => {
	validation.validateOrThrow(config.validationSchema, req.body);

	const key = config.getObjectKey();
	let existingObject = await db.getByKey(key);
	if (existingObject) {
		throw customError(
			`An object with key "${key}" already exists in the database.`,
			400
		);
	}

	const dbObject = config.buildDbObject(req.body);
	await db.put(config.dbKind, dbObject);
	const createdObject = await db.getByKey(key);

	const responseBody = config.buildResponseBody(createdObject);	
	res.json(responseBody);
};

const getByKeyAction = async (req, res, config) => {
	validation.validateOrThrow(config.validationSchema, req.body);
	const key = config.getObjectKey();
	let existingObject = await db.getByKey(key);

	if (!existingObject) {
		return res
			.status(404)
			.send({ error: config.notFoundMessage });
	}

	const responseBody = config.buildResponseBody(existingObject);
	res.json(responseBody);
};

/**
 * Build a custom error
 * @param {string} message Error message
 * @param {number} code Error code, should be HTTP status code
 */
const customError = (message = "An error occurred.", code = 500) => {
	const error = new Error(message);
	error.code = code;
	return error;
};

module.exports = {
	createAction,
	getByKeyAction,
};