Haketilo

/**

 * This file is part of Haketilo.

 *

 * Function: Settings page logic.

 *

 * 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 get_remote_storage

 * IMPORT TYPE_PREFIX

 * IMPORT TYPE_NAME

 * IMPORT list_prefixes

 * IMPORT nice_name

 * IMPORT parse_json_with_schema

 * IMPORT get_template

 * IMPORT by_id

 * IMPORT matchers

 * IMPORT get_import_frame

 * IMPORT init_default_policy_dialog

 * IMPORTS_END

 */

var storage;

const item_li_template = get_template("item_li");

const bag_component_li_template = get_template("bag_component_li");

const chbx_component_li_template = get_template("chbx_component_li");

const radio_component_li_template = get_template("radio_component_li");

/* Make sure they are later cloned without id. */

item_li_template.removeAttribute("id");

bag_component_li_template.removeAttribute("id");

chbx_component_li_template.removeAttribute("id");

radio_component_li_template.removeAttribute("id");

function list_set_scrollbar(list_elem)

{

    const op = ((list_elem.children.length === 1 &&

		 list_elem.children[0].classList.contains("hide")) ||

		list_elem.children.length < 1) ? "remove" : "add";

    while (!list_elem.classList.contains("table_wrapper"))

	list_elem = list_elem.parentElement;

    list_elem.classList[op]("always_scrollbar");

}

function item_li_id(prefix, item)

{

    return `li_${prefix}_${item}`;

}

/* Insert into list of bags/pages/scripts/repos */

function add_li(prefix, item, at_the_end=false)

{

    let ul = ul_by_prefix[prefix];

    let li = item_li_template.cloneNode(true);

    li.id = item_li_id(prefix, item);

    let span = li.firstElementChild;

    span.textContent = item;

    let edit_button = span.nextElementSibling;

    edit_button.addEventListener("click", () => edit_item(prefix, item));

    let remove_button = edit_button.nextElementSibling;

    remove_button.addEventListener("click",

				   () => storage.remove(prefix, item));

    let export_button = remove_button.nextElementSibling;

    export_button.addEventListener("click",

				   () => export_item(prefix, item));

    if (prefix === TYPE_PREFIX.REPO)

	export_button.remove();

    if (!at_the_end) {

	for (let element of ul.ul.children) {

	    if (element.id < li.id || element.id.startsWith("work_"))

		continue;

	    ul.ul.insertBefore(li, element);

	    break;

	}

    }

    if (!li.parentElement) {

	if (ul.work_li !== ul.ul.lastElementChild)

	    ul.ul.appendChild(li);

	else

	    ul.work_li.before(li);

    }

    list_set_scrollbar(ul.ul);

}

const chbx_components_ul = by_id("chbx_components_ul");

const radio_components_ul = by_id("radio_components_ul");

function chbx_li_id(prefix, item)

{

    return `cli_${prefix}_${item}`;

}

function radio_li_id(prefix, item)

{

    return `rli_${prefix}_${item}`;

}

//TODO: refactor the 2 functions below

function add_chbx_li(prefix, name)

{

    if (![TYPE_PREFIX.BAG, TYPE_PREFIX.SCRIPT].includes(prefix))

	return;

    let li = chbx_component_li_template.cloneNode(true);

    li.id = chbx_li_id(prefix, name);

    li.setAttribute("data-prefix", prefix);

    li.setAttribute("data-name", name);

    let chbx = li.firstElementChild.firstElementChild;

    let span = chbx.nextElementSibling;

    span.textContent = nice_name(prefix, name);

    chbx_components_ul.appendChild(li);

    list_set_scrollbar(chbx_components_ul);

}

var radio_component_none_li = by_id("radio_component_none_li");

function add_radio_li(prefix, name)

{

    if (![TYPE_PREFIX.BAG, TYPE_PREFIX.SCRIPT].includes(prefix))

	return;

    let li = radio_component_li_template.cloneNode(true);

    li.id = radio_li_id(prefix, name);

    li.setAttribute("data-prefix", prefix);

    li.setAttribute("data-name", name);

    let radio = li.firstElementChild.firstElementChild;

    let span = radio.nextElementSibling;

    span.textContent = nice_name(prefix, name);

    radio_component_none_li.before(li);

    list_set_scrollbar(radio_components_ul);

}

/* Used to reset edited repo. */

function reset_work_repo_li(ul, item, _)

{

    ul.work_name_input.value = maybe_string(item);

}

/* Used to get repo data for saving */

function work_repo_li_data(ul)

{

    return [ul.work_name_input.value, {}];

}

const allow_native_scripts_container = by_id("allow_native_scripts_container");

const page_payload_span = by_id("page_payload");

function set_page_components(components)

{

    if (components === undefined) {

	page_payload_span.setAttribute("data-payload", "no");

	page_payload_span.textContent = "(None)";

	allow_native_scripts_container.classList.remove("form_disabled");

    } else {

	page_payload_span.setAttribute("data-payload", "yes");

	let [prefix, name] = components;

	page_payload_span.setAttribute("data-prefix", prefix);

	page_payload_span.setAttribute("data-name", name);

	page_payload_span.textContent = nice_name(prefix, name);

	allow_native_scripts_container.classList.add("form_disabled");

    }

}

const page_allow_chbx = by_id("page_allow_chbx");

/* Used to reset edited page. */

function reset_work_page_li(ul, item, settings)

{

    ul.work_name_input.value = maybe_string(item);

    settings = settings || {allow: false, components: undefined};

    page_allow_chbx.checked = !!settings.allow;

    set_page_components(settings.components);

}

function work_page_li_components()

{

    if (page_payload_span.getAttribute("data-payload") === "no")

	return undefined;

    let prefix = page_payload_span.getAttribute("data-prefix");

    let name = page_payload_span.getAttribute("data-name");

    return [prefix, name];

}

/* Used to get edited page data for saving. */

function work_page_li_data(ul)

{

    let url = ul.work_name_input.value;

    let settings = {

	components : work_page_li_components(),

	allow : !!page_allow_chbx.checked

    };

    return [url, settings];

}

const empty_bag_component_li = by_id("empty_bag_component_li");

var bag_components_ul = by_id("bag_components_ul");

function remove_bag_component_entry(entry)

{

    const list = entry.parentElement;

    entry.remove();

    list_set_scrollbar(list);

}

/* Used to construct and update components list of edited bag. */

function add_bag_components(components)

{

    for (let component of components) {

	let [prefix, name] = component;

	let li = bag_component_li_template.cloneNode(true);

	li.setAttribute("data-prefix", prefix);

	li.setAttribute("data-name", name);

	let span = li.firstElementChild;

	span.textContent = nice_name(prefix, name);

	let remove_but = span.nextElementSibling;

	remove_but.addEventListener("click",

				    () => remove_bag_component_entry(li));

	bag_components_ul.appendChild(li);

    }

    bag_components_ul.appendChild(empty_bag_component_li);

    list_set_scrollbar(bag_components_ul);

}

/* Used to reset edited bag. */

function reset_work_bag_li(ul, item, components)

{

    components = components || [];

    ul.work_name_input.value = maybe_string(item);

    let old_components_ul = bag_components_ul;

    bag_components_ul = old_components_ul.cloneNode(false);

    old_components_ul.replaceWith(bag_components_ul);

    add_bag_components(components);

}

/* Used to get edited bag data for saving. */

function work_bag_li_data(ul)

{

    let component_li = bag_components_ul.firstElementChild;

    let components = [];

    /* Last list element is empty li with id set. */

    while (component_li.id === '') {

	components.push([component_li.getAttribute("data-prefix"),

			 component_li.getAttribute("data-name")]);

	component_li = component_li.nextElementSibling;

    }

    return [ul.work_name_input.value, components];

}

const script_url_input = by_id("script_url_field");

const script_sha256_input = by_id("script_sha256_field");

const script_contents_field = by_id("script_contents_field");

function maybe_string(maybe_defined)

{

    return maybe_defined === undefined ? "" : maybe_defined + "";

}

/* Used to reset edited script. */

function reset_work_script_li(ul, name, data)

{

    ul.work_name_input.value = maybe_string(name);

    if (data === undefined)

	data = {};

    script_url_input.value = maybe_string(data.url);

    script_sha256_input.value = maybe_string(data.hash);

    script_contents_field.value = maybe_string(data.text);

}

/* Used to get edited script data for saving. */

function work_script_li_data(ul)

{

    return [ul.work_name_input.value, {

	url : script_url_input.value,

	hash : script_sha256_input.value,

	text : script_contents_field.value

    }];

}

function cancel_work(prefix)

{

    let ul = ul_by_prefix[prefix];

    if (ul.state === UL_STATE.IDLE)

	return;

    if (ul.state === UL_STATE.EDITING_ENTRY) {

	add_li(prefix, ul.edited_item);

    }

    ul.work_li.classList.add("hide");

    ul.ul.append(ul.work_li);

    list_set_scrollbar(ul.ul);

    ul.state = UL_STATE.IDLE;

}

function save_work(prefix)

{

    let ul = ul_by_prefix[prefix];

    if (ul.state === UL_STATE.IDLE)

	return;

    let [item, data] = ul.get_work_li_data(ul);

    /* Here we fire promises and return without waiting. */

    if (ul.state === UL_STATE.EDITING_ENTRY)

	storage.replace(prefix, ul.edited_item, item, data);

    if (ul.state === UL_STATE.ADDING_ENTRY)

	storage.set(prefix, item, data);

    cancel_work(prefix);

}

function edit_item(prefix, item)

{

    cancel_work(prefix);

    let ul = ul_by_prefix[prefix];

    let li = by_id(item_li_id(prefix, item));

    if (li === null) {

	add_new_item(prefix, item);

	return;

    }

    ul.reset_work_li(ul, item, storage.get(prefix, item));

    ul.ul.insertBefore(ul.work_li, li);

    ul.ul.removeChild(li);

    ul.work_li.classList.remove("hide");

    list_set_scrollbar(ul.ul);

    ul.state = UL_STATE.EDITING_ENTRY;

    ul.edited_item = item;

}

const file_downloader = by_id("file_downloader");

function recursively_export_item(prefix, name, added_items, items_data)

{

    let key = prefix + name;

    if (added_items.has(key))

	return;

    let data = storage.get(prefix, name);

    if (data === undefined) {

	console.log(`${TYPE_NAME[prefix]} '${name}' for export not found`);

	return;

    }

    if (prefix !== TYPE_PREFIX.SCRIPT) {

	let components = prefix === TYPE_PREFIX.BAG ?

	    data : [data.components];

	for (let [comp_prefix, comp_name] of components) {

	    recursively_export_item(comp_prefix, comp_name,

				    added_items, items_data);

	}

    }

    items_data.push({[key]: data});

    added_items.add(key);

}

function export_item(prefix, name)

{

    let added_items = new Set();

    let items_data = [];

    recursively_export_item(prefix, name, added_items, items_data);

    let file = new Blob([JSON.stringify(items_data)],

			{type: "application/json"});

    let url = URL.createObjectURL(file);

    file_downloader.setAttribute("href", url);

    file_downloader.setAttribute("download", prefix + name + ".json");

    file_downloader.click();

    file_downloader.removeAttribute("href");

    URL.revokeObjectURL(url);

}

function add_new_item(prefix, name)

{

    cancel_work(prefix);

    let ul = ul_by_prefix[prefix];

    ul.reset_work_li(ul);

    ul.work_li.classList.remove("hide");

    ul.ul.appendChild(ul.work_li);

    list_set_scrollbar(ul.ul);

    if (name !== undefined)

	ul.work_name_input.value = name;

    ul.state = UL_STATE.ADDING_ENTRY;

}

const chbx_components_window = by_id("chbx_components_window");

function bag_components()

{

    chbx_components_window.classList.remove("hide");

    radio_components_window.classList.add("hide");

    for (let li of chbx_components_ul.children) {

	let chbx = li.firstElementChild.firstElementChild;

	chbx.checked = false;

    }

}

function commit_bag_components()

{

    let selected = [];

    for (let li of chbx_components_ul.children) {

	let chbx = li.firstElementChild.firstElementChild;

	if (!chbx.checked)

	    continue;

	selected.push([li.getAttribute("data-prefix"),

		       li.getAttribute("data-name")]);

    }

    add_bag_components(selected);

    cancel_components();

}

const radio_components_window = by_id("radio_components_window");

var radio_component_none_input = by_id("radio_component_none_input");

function page_components()

{

    radio_components_window.classList.remove("hide");

    chbx_components_window.classList.add("hide");

    radio_component_none_input.checked = true;

    let components = work_page_li_components();

    if (components === undefined)

	return;

    let [prefix, item] = components;

    let li = by_id(radio_li_id(prefix, item));

    if (li === null)

	radio_component_none_input.checked = false;

    else

	li.firstElementChild.firstElementChild.checked = true;

}

function commit_page_components()

{

    let components = null;

    for (let li of radio_components_ul.children) {

	let radio = li.firstElementChild.firstElementChild;

	if (!radio.checked)

	    continue;

	components = [li.getAttribute("data-prefix"),

		      li.getAttribute("data-name")];

	if (radio.id === "radio_component_none_input")

	    components = undefined;

	break;

    }

    if (components !== null)

	set_page_components(components);

    cancel_components();

}

function cancel_components()

{

    chbx_components_window.classList.add("hide");

    radio_components_window.classList.add("hide");

}

const UL_STATE = {

    EDITING_ENTRY : 0,

    ADDING_ENTRY : 1,

    IDLE : 2

};

const ul_by_prefix = {

    [TYPE_PREFIX.REPO] : {

	ul : by_id("repos_ul"),

	work_li : by_id("work_repo_li"),

	work_name_input : by_id("repo_url_field"),

	reset_work_li : reset_work_repo_li,

	get_work_li_data : work_repo_li_data,

	state : UL_STATE.IDLE,

	edited_item : undefined,

    },

    [TYPE_PREFIX.PAGE] : {

	ul : by_id("pages_ul"),

	work_li : by_id("work_page_li"),

	work_name_input : by_id("page_url_field"),

	reset_work_li : reset_work_page_li,

	get_work_li_data : work_page_li_data,

	select_components : page_components,

	commit_components : commit_page_components,

	state : UL_STATE.IDLE,

	edited_item : undefined,

    },

    [TYPE_PREFIX.BAG] : {

	ul : by_id("bags_ul"),

	work_li : by_id("work_bag_li"),

	work_name_input : by_id("bag_name_field"),

	reset_work_li : reset_work_bag_li,

	get_work_li_data : work_bag_li_data,

	select_components : bag_components,

	commit_components : commit_bag_components,

	state : UL_STATE.IDLE,

	edited_item : undefined,

    },

    [TYPE_PREFIX.SCRIPT] : {

	ul : by_id("scripts_ul"),

	work_li : by_id("work_script_li"),

	work_name_input : by_id("script_name_field"),

	reset_work_li : reset_work_script_li,

	get_work_li_data : work_script_li_data,

	state : UL_STATE.IDLE,

	edited_item : undefined,

    }

}

/*

 * Newer browsers could utilise `text' method of File objects.

 * Older ones require FileReader.

 */

function _read_file(file, resolve, reject)

{

    let reader = new FileReader();

    reader.onload = () => resolve(reader.result);

    reader.onerror = () => reject(reader.error);

    reader.readAsText(file);

}

function read_file(file)

{

    return new Promise((resolve, reject) =>

		       _read_file(file, resolve, reject));

}

const url_regex = /^[a-z0-9]+:\/\/[^/]+\.[^/]{2,}(\/[^?#]*)?$/;

const empty_regex = /^$/;

const settings_schema = [

    [{}, "matchentry", "minentries", 1,

     new RegExp(`^${TYPE_PREFIX.SCRIPT}`), {

	 /* script data */

	 "url":    ["optional", url_regex, "or", empty_regex],

	 "sha256": ["optional", matchers.sha256, "or", empty_regex],

	 "text":   ["optional", "string"]

     },

     new RegExp(`^${TYPE_PREFIX.BAG}`), [

	 "optional",

	 [matchers.component, "repeat"],

	 "default", undefined

     ],

     new RegExp(`^${TYPE_PREFIX.PAGE}`), {

	 /* page data */

	 "components": ["optional", matchers.component]

     }], "repeat"

];

const import_window = by_id("import_window");

let import_frame;

async function import_from_file(event)

{

    let files = event.target.files;

    if (files.length < 1)

	return;

    import_window.classList.remove("hide");

    import_frame.show_loading();

    try {

	const file = await read_file(files[0]);

	var result = parse_json_with_schema(settings_schema, file);

    } catch(e) {

	import_frame.show_error("Bad file :(", "" + e);

	return;

    }

    import_frame.show_selection(result);

}

const file_opener_form = by_id("file_opener_form");

function hide_import_window()

{

    import_window.classList.add("hide");

    /*

     * Reset file <input>. Without this, a second attempt to import the same

     * file would result in "change" event not happening on <input> element.

     */

    file_opener_form.reset();

}

async function initialize_import_facility()

{

    let import_but = by_id("import_but");

    let file_opener = by_id("file_opener");

    import_but.addEventListener("click", () => file_opener.click());

    file_opener.addEventListener("change", import_from_file);

    import_frame = await get_import_frame();

    import_frame.onclose = hide_import_window;

    import_frame.style_table("has_bottom_line", "always_scrollbar",

			     "has_upper_line", "tight_table");

}

/*

 * If url has a target appended, e.g.

 * chrome-extension://hnhmbnpohhlmhehionjgongbnfdnabdl/html/options.html#smyhax

 * that target will be split into prefix and item name (e.g. "s" and "myhax")

 * and editing of that respective item will be started.

 *

 * We don't need to worry about the state of the page (e.g. some editing being

 * in progress) in jump_to_item() - this function is called at the beginning,

 * together with callbacks being assigned to buttons, so it is safe to assume

 * lists are initialized with items and page is in its virgin state with regard

 * to everything else.

 */

function jump_to_item(url_with_item)

{

    const [dummy1, base_url, dummy2, target] =

	  /^([^#]*)(#(.*))?$/i.exec(url_with_item);

    if (target === undefined)

	return;

    const prefix = target.substring(0, 1);

    if (!list_prefixes.includes(prefix)) {

	history.replaceState(null, "", base_url);

	return;

    }

    by_id(`show_${TYPE_NAME[prefix]}s`).checked = true;

    edit_item(prefix, decodeURIComponent(target.substring(1)));

}

async function main()

{

    init_default_policy_dialog();

    storage = await get_remote_storage();

    for (let prefix of list_prefixes) {

	for (let item of storage.get_all_names(prefix).sort()) {

	    add_li(prefix, item, true);

	    add_chbx_li(prefix, item);

	    add_radio_li(prefix, item);

	}

	let name = TYPE_NAME[prefix];

	let add_but = by_id(`add_${name}_but`);

	let discard_but = by_id(`discard_${name}_but`);

	let save_but = by_id(`save_${name}_but`);

	add_but.addEventListener("click", () => add_new_item(prefix));

	discard_but.addEventListener("click", () => cancel_work(prefix));

	save_but.addEventListener("click", () => save_work(prefix));

	if ([TYPE_PREFIX.REPO, TYPE_PREFIX.SCRIPT].includes(prefix))

	    continue;

	let ul = ul_by_prefix[prefix];

	let commit_components_but = by_id(`commit_${name}_components_but`);

	let cancel_components_but = by_id(`cancel_${name}_components_but`);

	let select_components_but = by_id(`select_${name}_components_but`);

	commit_components_but

	    .addEventListener("click", ul.commit_components);

	select_components_but

	    .addEventListener("click", ul.select_components);

	cancel_components_but.addEventListener("click", cancel_components);

    }

    jump_to_item(document.URL);

    storage.add_change_listener(handle_change);

    await initialize_import_facility();

}

function handle_change(change)

{

    if (change.old_val === undefined) {

	add_li(change.prefix, change.item);

	add_chbx_li(change.prefix, change.item);

	add_radio_li(change.prefix, change.item);

	return;

    }

    if (change.new_val !== undefined)

	return;

    let ul = ul_by_prefix[change.prefix];

    if (ul.state === UL_STATE.EDITING_ENTRY &&

	ul.edited_item === change.item) {

	ul.state = UL_STATE.ADDING_ENTRY;

	return;

    }

    let uls_creators = [[ul.ul, item_li_id]];

    if ([TYPE_PREFIX.BAG, TYPE_PREFIX.SCRIPT].includes(change.prefix)) {

	uls_creators.push([chbx_components_ul, chbx_li_id]);

	uls_creators.push([radio_components_ul, radio_li_id]);

    }

    for (let [components_ul, id_creator] of uls_creators) {

	let li = by_id(id_creator(change.prefix, change.item));

	components_ul.removeChild(li);

	list_set_scrollbar(components_ul);

    }

}

main();