/**
 * Myext storage through connection (server side)
 *
 * Copyright (C) 2021 Wojtek Kosior
 *
 * This code is dual-licensed under:
 * - Asshole license 1.0,
 * - GPLv3 or (at your option) any later version
 *
 * "dual-licensed" means you can choose the license you prefer.
 *
 * This code is released under a permissive license because I disapprove of
 * copyright and wouldn't be willing to sue a violator. Despite not putting
 * this code under copyleft (which is also kind of copyright), I do not want
 * it to be made proprietary. Hence, the permissive alternative to GPL is the
 * Asshole license 1.0 that allows me to call you an asshole if you use it.
 * This means you're legally ok regardless of how you utilize this code but if
 * you make it into something nonfree, you're an asshole.
 *
 * You should have received a copy of both GPLv3 and Asshole license 1.0
 * together with this code. If not, please see:
 * - https://www.gnu.org/licenses/gpl-3.0.en.html
 * - https://koszko.org/asshole-license.txt
 */

"use strict";

(() => {
    const listen_for_connection = window.listen_for_connection;
    const get_storage = window.get_storage;
    const TYPE_PREFIX = window.TYPE_PREFIX;
    const CONNECTION_TYPE = window.CONNECTION_TYPE;

    var storage;

    async function handle_remote_call(port, message)
    {
	let [call_id, func, args] = message;

	try {
	    let result = await Promise.resolve(storage[func](...args));
	    port.postMessage({call_id, result});
	} catch (error) {
	    error = error + '';
	    port.postMessage({call_id, error});
	}
    }

    function remove_storage_listener(cb) {
	storage.remove_change_listener(cb);
    }

    function new_connection(port)
    {
	console.log("new remote storage connection!");

	port.postMessage({
	    [TYPE_PREFIX.SCRIPT] : storage.get_all(TYPE_PREFIX.SCRIPT),
	    [TYPE_PREFIX.BAG] : storage.get_all(TYPE_PREFIX.BAG),
	    [TYPE_PREFIX.PAGE] : storage.get_all(TYPE_PREFIX.PAGE)
	});

	let handle_change = change => port.postMessage(change);

	storage.add_change_listener(handle_change);

	port.onMessage.addListener(m => handle_remote_call(port, m));
	port.onDisconnect.addListener(() =>
				      remove_storage_listener(handle_change));
    }

    async function start()
    {
	storage = await get_storage();

	listen_for_connection(CONNECTION_TYPE.REMOTE_STORAGE, new_connection);
    }

    window.start_storage_server = start;
})();