/**
 * This file is part of Haketilo.
 *
 * Function: Show details of how Haketilo handled given page, drive popup.
 *
 * Copyright (C) 2021,2022 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 of this code in a
 * proprietary program, I am not going to enforce this in court.
 */

#FROM common/browser.js   IMPORT browser
#FROM common/misc.js      IMPORT is_privileged_url
#FROM html/DOM_helpers.js IMPORT by_id
#FROM html/repo_query.js  IMPORT RepoQueryView

const tab_query = {currentWindow: true, active: true};

async function get_current_tab() {
#IF CHROMIUM
    const callback = (cb) => browser.tabs.query(tab_query, tab => cb(tab));
    const promise = new Promise(callback);
#ELIF MOZILLA
    const promise = browser.tabs.query(tab_query);
#ENDIF

    try {
	return (await promise)[0];
    } catch(e) {
	console.log("Haketilo:", e);
    }
}

async function get_page_info(tab_id) {
    return browser.tabs.sendMessage(tab_id, ["page_info"]);
}

function show_page_info(page_info) {
    by_id("loading_info").remove();
    by_id("info_form").classList.remove("hide");
    by_id("page_url").innerText = page_info.url;

    if (page_info.privileged) {
	by_id("privileged_page_info").classList.remove("hide");
    } else {
	by_id("unprivileged_page_info").classList.remove("hide");

	by_id("scripts_blocked").innerText = page_info.allow ? "no" : "yes";

	let payload_text = "None";

	if (page_info.payload) {
	    if ("error" in page_info) {
		let long_msg = true;

		if (page_info.error.haketilo_error_type === "missing")
		    payload_text = `None (error: resource with id '${page_info.error.id}' missing from the database)`;
		else if (page_info.error.haketilo_error_type === "circular")
		    payload_text = `None (error: circular dependency of resource with id '${page_info.error.id}' on itself)`;
		else if (page_info.error.haketilo_error_type === "db")
		    payload_text = `None (error: failure reading Haketilo internal database)`;
		else if (page_info.error.haketilo_error_type === "other")
		    payload_text = `None (error: unknown failure occured)`;
		else
		    long_msg = false;

		if (long_msg)
		    by_id("injected_payload").classList.add("long_msg");
	    } else {
		payload_text = page_info.payload.identifier;
	    }
	}

	by_id("injected_payload").innerText = payload_text;

	const scripts_fate = page_info.allow ? "allowed" : "blocked";

	let mapping_text, long_msg = true;

	if (page_info.mapping === "~allow") {
	    mapping_text = `None (scripts ${scripts_fate} by a rule)`;
	} else if ("error" in page_info &&
		   page_info.error.haketilo_error_type === "deciding_policy") {
	    mapping_text = `None (error occured when determining policy)`;
	} else if (page_info.mapping) {
	    mapping_text = page_info.mapping;
	    long_msg = false;
	} else {
	    mapping_text = `None (scripts ${scripts_fate} by default policy)`;
	}

	by_id("mapping_used").innerText = mapping_text;
	if (long_msg)
	    by_id("mapping_used").classList.add("long_msg");
    }
}

function repo_query_showing(show) {
    for (const [id, i] of [["repo_query", 0], ["page_info", 1]])
	by_id(`${id}_container`).classList[["add", "remove"][show ^ i]]("hide");
}

function prepare_repo_query_view(tab, page_info) {
    const repo_query_view = new RepoQueryView(tab,
					      () => repo_query_showing(true),
					      () => repo_query_showing(false));
    by_id("repo_query_container").prepend(repo_query_view.main_div);

    let search_cb = () => repo_query_view.show(page_info.url);
    search_cb = repo_query_view.when_hidden(search_cb);
    by_id("search_resources_but").addEventListener("click", search_cb);
    by_id("search_resources_but").classList.remove("hide");
}

async function main() {
    const settings_opener = (e) => browser.runtime.openOptionsPage();
    by_id("settings_but").addEventListener("click", settings_opener);

    try {
	var tab = await get_current_tab();
	var tab_id = tab.id;

	if (is_privileged_url(tab.url))
	    var page_info = {privileged: true, url: tab.url};
	else
	    var page_info = await get_page_info(tab_id);
    } catch(e) {
	console.error("Haketilo:", e);
    }

    if (page_info) {
	show_page_info(page_info);
	if (!page_info.privileged)
	    prepare_repo_query_view(tab, page_info);
    } else {
	by_id("loading_info").innerText =
	    "Page info not avaialable. Try reloading the page.";
    }
}

main();