/**
 * This file is part of Haketilo.
 *
 * Function: Informing the popup about what happens in the content script
 *     (script injection, script blocking, etc.).
 *
 * Copyright (C) 2021 Wojtek Kosior
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * As additional permission under GNU GPL version 3 section 7, you
 * may distribute forms of that code without the copy of the GNU
 * GPL normally required by section 4, provided you include this
 * license notice and, in case of non-source distribution, a URL
 * through which recipients can access the Corresponding Source.
 * If you modify file(s) with this exception, you may extend this
 * exception to your version of the file(s), but you are not
 * obligated to do so. If you do not wish to do so, delete this
 * exception statement from your version.
 *
 * As a special exception to the GPL, any HTML file which merely
 * makes function calls to this code, and for that purpose
 * includes it by reference shall be deemed a separate work for
 * copyright law purposes. If you modify this code, you may extend
 * this exception to your version of the code, but you are not
 * obligated to do so. If you do not wish to do so, delete this
 * exception statement from your version.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 * I, Wojtek Kosior, thereby promise not to sue for violation of this file's
 * license. Although I request that you do not make use this code in a
 * proprietary program, I am not going to enforce this in court.
 */

/*
 * IMPORTS_START
 * IMPORT listen_for_connection
 * IMPORT CONNECTION_TYPE
 * IMPORT repo_query
 * IMPORT subscribe_repo_query_results
 * IMPORT unsubscribe_repo_query_results
 * IMPORTS_END
 */

var activities = [];
var ports = new Set();

function report_activity_oneshot(name, data, port)
{
    port.postMessage([name, data]);
}

function report_activity(name, data)
{
    const activity = [name, data];
    activities.push(activity);

    for (const port of ports)
	port.postMessage(activity);
}

function report_script(script_data)
{
    report_activity("script", script_data);
}

function report_settings(settings)
{
    const settings_clone = {};
    Object.assign(settings_clone, settings)
    report_activity("settings", settings_clone);
}

function report_document_type(is_html)
{
    report_activity("is_html", is_html);
}

function report_repo_query_action(update, port)
{
    report_activity_oneshot("repo_query_action", update, port);
}

function trigger_repo_query(query_specifier)
{
    repo_query(...query_specifier);
}

function handle_disconnect(port, report_action)
{
    ports.delete(port)
    unsubscribe_repo_query_results(report_action);
}

function new_connection(port)
{
    console.log("new activity info connection!");

    ports.add(port);

    for (const activity of activities)
	port.postMessage(activity);

    const report_action = u => report_repo_query_action(u, port);
    subscribe_repo_query_results(report_action);

    /*
     * So far the only thing we expect to receive is repo query order. Once more
     * possibilities arrive, we will need to complicate this listener.
     */
    port.onMessage.addListener(trigger_repo_query);

    port.onDisconnect.addListener(() => handle_disconnect(port, report_action));
}

function start_activity_info_server()
{
    listen_for_connection(CONNECTION_TYPE.ACTIVITY_INFO, new_connection);
}

/*
 * EXPORTS_START
 * EXPORT start_activity_info_server
 * EXPORT report_script
 * EXPORT report_settings
 * EXPORT report_document_type
 * EXPORTS_END
 */