/**
 * Main Options Page
 * Belongs to LocalCDN (since 2020-02-26)
 * (Origin: Decentraleyes)
 *
 * @author      Thomas Rientjes
 * @since       2016-08-09
 *
 * @author      nobody
 * @since       2020-05-04
 *
 * @license     MPL 2.0
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/.
 */

'use strict';

/**
 * Options
 */

var options = {};

/**
 * Private Methods
 */

options._renderContents = function () {

    let translationComplete = true;

    document.body.setAttribute('dir', options._scriptDirection);
    translationComplete = helpers.insertI18nContentIntoDocument(document);

    options._determineOptionValues()
        .then(options._renderOptionsPanel);

    if (!translationComplete) {
        options._renderLocaleNotice();
    }

};

options._renderOptionsPanel = function () {

    let whitelistedDomains, domainWhitelist, elements, htmlFilterDomains, domainHtmlFilter;

    whitelistedDomains = options._optionValues.whitelistedDomains;
    domainWhitelist = options._serializeWhitelistedDomains(whitelistedDomains);

    htmlFilterDomains = options._optionValues.domainsManipulateDOM;
    domainHtmlFilter = options._serializeWhitelistedDomains(htmlFilterDomains);

    elements = options._optionElements;

    elements.showIconBadge.checked = options._optionValues.showIconBadge;
    elements.blockMissing.checked = options._optionValues.blockMissing;
    elements.disablePrefetch.checked = options._optionValues.disablePrefetch;
    elements.stripMetadata.checked = options._optionValues.stripMetadata;
    elements.hideReleaseNotes.checked = options._optionValues.hideReleaseNotes;
    elements.enableLogging.checked = options._optionValues.enableLogging;
    elements.whitelistedDomains.value = domainWhitelist;
    elements.domainsManipulateDOM.value = domainHtmlFilter;
    elements.negateHtmlFilterList.checked = options._optionValues.negateHtmlFilterList;
    elements.blockGoogleFonts.checked = options._optionValues.blockGoogleFonts;

    options._registerOptionChangedEventListeners(elements);
    options._registerMiscellaneousEventListeners();

    if (options._optionValues.blockMissing === true) {
        options._renderBlockMissingNotice();
    }

    if (options._languageSupported === false) {
        options._renderLocaleNotice();
    }

    options._displayBlockGoogleFonts(options._optionValues.blockMissing);

    if(elements.negateHtmlFilterList.checked === true) {
        document.getElementById('html-filter-domains-title-include').style.display = "none";
        document.getElementById('html-filter-domains-title-exclude').style.display = "block";
    } else {
        document.getElementById('html-filter-domains-title-include').style.display = "block";
        document.getElementById('html-filter-domains-title-exclude').style.display = "none";
    }

    document.getElementById('last-mapping-update').textContent += ' ' + lastMappingUpdate;
    document.getElementById('negate-html-filter-list-warning').addEventListener('click', options._onClickHTMLFilterWarning);
    document.getElementById('link-welcome-page').addEventListener('click', options._onClickWelcomePage);
    document.getElementById('link-changelog').addEventListener('click', options._onClickChangelog);
    document.getElementById('link-donate').addEventListener('click', options._onClickDonate);
};

options._renderBlockMissingNotice = function () {

    let blockMissingNoticeElement = document.getElementById('notice-block-missing');
    blockMissingNoticeElement.setAttribute('class', 'notice notice-warning');
};

options._hideBlockMissingNotice = function () {

    let blockMissingNoticeElement = document.getElementById('notice-block-missing');
    blockMissingNoticeElement.setAttribute('class', 'notice notice-warning hidden');
};

options._renderLocaleNotice = function () {

    let localeNoticeElement = document.getElementById('notice-locale');
    localeNoticeElement.setAttribute('class', 'notice notice-default');
};

options._registerOptionChangedEventListeners = function (elements) {

    elements.showIconBadge.addEventListener('change', options._onOptionChanged);
    elements.blockMissing.addEventListener('change', options._onOptionChanged);
    elements.disablePrefetch.addEventListener('change', options._onOptionChanged);
    elements.stripMetadata.addEventListener('change', options._onOptionChanged);
    elements.enableLogging.addEventListener('change', options._onOptionChanged);
    elements.hideReleaseNotes.addEventListener('change', options._onOptionChanged);
    elements.whitelistedDomains.addEventListener('keyup', options._onOptionChanged);
    elements.domainsManipulateDOM.addEventListener('keyup', options._onOptionChanged);
    elements.negateHtmlFilterList.addEventListener('change', options._onOptionChanged);
    elements.blockGoogleFonts.addEventListener('change', options._onOptionChanged);
    let type = elements.ruleSets;
    for(let i = 0; i < type.length; i++) {
        type[i].addEventListener('change', options._openRuleSet);
    }
    elements.copyRuleSet.addEventListener('click', options._copyRuleSet);
};

options._registerMiscellaneousEventListeners = function () {

    let blockMissingButtonElement = document.getElementById('button-block-missing');

    blockMissingButtonElement.addEventListener('click', function () {

        let changeEvent = new Event('change');

        options._optionElements.blockMissing.checked = false;
        options._optionElements.blockMissing.dispatchEvent(changeEvent);
    });
};

options._determineOptionValues = function () {

    return new Promise((resolve) => {

        let optionKeys = Object.keys(options._optionElements);

        chrome.storage.sync.get(optionKeys, function (items) {

            options._optionValues = items;
            resolve();
        });
    });
};

options._getOptionElement = function (optionKey) {
    return document.querySelector(`[data-option=${optionKey}]`);
};

options._getOptionElements = function () {

    let optionElements = {
        [Setting.SHOW_ICON_BADGE]: options._getOptionElement(Setting.SHOW_ICON_BADGE),
        [Setting.BLOCK_MISSING]: options._getOptionElement(Setting.BLOCK_MISSING),
        [Setting.DISABLE_PREFETCH]: options._getOptionElement(Setting.DISABLE_PREFETCH),
        [Setting.STRIP_METADATA]: options._getOptionElement(Setting.STRIP_METADATA),
        [Setting.WHITELISTED_DOMAINS]: options._getOptionElement(Setting.WHITELISTED_DOMAINS),
        [Setting.HIDE_RELEASE_NOTES]: options._getOptionElement(Setting.HIDE_RELEASE_NOTES),
        [Setting.LOGGING]: options._getOptionElement(Setting.LOGGING),
        ['ruleSets']: document.getElementsByName("rule-sets"),
        ['copyRuleSet']: document.getElementById("button-copy-rule-set"),
        [Setting.NEGATE_HTML_FILTER_LIST]: options._getOptionElement(Setting.NEGATE_HTML_FILTER_LIST),
        [Setting.DOMAINS_MANIPULATE_DOM]: options._getOptionElement(Setting.DOMAINS_MANIPULATE_DOM),
        [Setting.BLOCK_GOOGLE_FONTS]: options._getOptionElement(Setting.BLOCK_GOOGLE_FONTS)
    };

    return optionElements;
};

options._configureLinkPrefetching = function (value) {

    if (value === false) {

        // Restore default values of related preference values.
        chrome.privacy.network.networkPredictionEnabled.clear({});

    } else {

        chrome.privacy.network.networkPredictionEnabled.set({
            'value': false
        });
    }
};

options._serializeWhitelistedDomains = function (whitelistedDomains) {

    if (whitelistedDomains === undefined) return;

    let domainWhitelist, whitelistedDomainKeys;

    whitelistedDomainKeys = Object.keys(whitelistedDomains);
    domainWhitelist = '';

    whitelistedDomainKeys.forEach(function (domain) {
        domainWhitelist = `${domainWhitelist}${domain};`;
    });

    domainWhitelist = domainWhitelist.slice(0, -1);
    domainWhitelist = domainWhitelist.replace(Whitelist.TRIM_EXPRESSION, '');

    return domainWhitelist;
};

options._parseDomainWhitelist = function (domainWhitelist) {

    let whitelistedDomains = {};

    domainWhitelist.split(Whitelist.VALUE_SEPARATOR).forEach(function (domain) {
        whitelistedDomains[helpers.normalizeDomain(domain)] = true;
    });

    return whitelistedDomains;
};

/**
 * Event Handlers
 */

options._onDocumentLoaded = function () {

    let language = navigator.language;

    options._optionElements = options._getOptionElements();
    options._languageSupported = helpers.languageIsFullySupported(language);
    options._scriptDirection = helpers.determineScriptDirection(language);

    options._renderContents();
};

options._onOptionChanged = function ({target}) {

    let optionKey, optionType, optionValue;

    optionKey = target.getAttribute('data-option');
    optionType = target.getAttribute('type');

    if (optionType === 'checkbox') {
        optionValue = target.checked;
    } else {
        optionValue = target.value;
    }

    if (optionKey === Setting.BLOCK_MISSING) {

        if (optionValue === true) {
            options._renderBlockMissingNotice();
            options._displayBlockGoogleFonts(true);
        } else {
            options._hideBlockMissingNotice();
            options._displayBlockGoogleFonts(false);
        }
    }

    if (optionKey === Setting.DISABLE_PREFETCH) {
        options._configureLinkPrefetching(optionValue);
    }

    if (optionKey === Setting.WHITELISTED_DOMAINS || optionKey === Setting.DOMAINS_MANIPULATE_DOM) {
        optionValue = options._parseDomainWhitelist(optionValue);
    }

    if (optionKey === Setting.NEGATE_HTML_FILTER_LIST) {
        if(optionValue === true) {
            document.getElementById('html-filter-domains-title-include').style.display = "none";
            document.getElementById('html-filter-domains-title-exclude').style.display = "block";
        } else {
            document.getElementById('html-filter-domains-title-include').style.display = "block";
            document.getElementById('html-filter-domains-title-exclude').style.display = "none";
        }
    }

    chrome.storage.sync.set({
        [optionKey]: optionValue
    });
};

options._openRuleSet = function({target}) {

    let urls = mappings;
    let optionKey = target.getAttribute('data-option');
    let textArea = document.getElementById("generated-rules");
    let btnCopy = document.getElementById("button-copy-rule-set");
    let content = "";

    textArea.style.display = "block";
    btnCopy.style.display = "block";

    for (var domain in urls) {
        if (optionKey === "uMatrix") {
            content += "* " + domain + " script allow" + '\n';
            content += "* " + domain + " css allow" + '\n';
        } else if (optionKey === "uBlock") {
            content += "* " + domain + " * noop" + '\n';
        }
    }
    textArea.value = content.replace(/\n+$/, "");
};

options._copyRuleSet = function() {
    let textArea = document.getElementById("generated-rules");
    navigator.clipboard.writeText(textArea.value).then(function() {
        textArea.select();
    }, function() {
        alert("Rule set cannot be copied!");
    });
};

options._onClickHTMLFilterWarning = function() {
    chrome.tabs.create({
        'url': 'https://codeberg.org/nobody/LocalCDN/wiki/Blank-websites-or-weird-characters',
        'active': true
    });
};

options._onClickWelcomePage = function() {
    chrome.tabs.create({
        'url': chrome.extension.getURL('pages/welcome/welcome.html'),
        'active': true
    });
};

options._onClickDonate = function() {
    chrome.tabs.create({
        'url': chrome.extension.getURL('pages/donate/donate.html'),
        'active': true
    });
};

options._onClickChangelog = function() {
    chrome.tabs.create({
        'url': chrome.extension.getURL('pages/updates/updates.html'),
        'active': true
    });
};

/**
 *  Updates the domain lists if the options page has no focus.
 *  document.hasFocus() prevents problems with keyboard input.
 */
options._updatesDomainLists = function(changes) {

    let changedItems = Object.keys(changes);

    if(!document.hasFocus()){
        if (changedItems[0] === 'whitelistedDomains') {
            document.getElementById('tf-domains-whitelist').value = options._serializeWhitelistedDomains(changes['whitelistedDomains'].newValue);
        } else if (changedItems[0] === 'domainsManipulateDOM') {
            document.getElementById('tf-domains-manipulate-dom').value = options._serializeWhitelistedDomains(changes['domainsManipulateDOM'].newValue);
        }
    } else {
        // document has the focus
    }
};

options._displayBlockGoogleFonts = function(value) {
    if (value === true) {
        document.getElementById('block-google-fonts').style.display = "none";
    } else {
        document.getElementById('block-google-fonts').style.display = "block";
    }
};

/**
 * Initializations
 */

document.addEventListener('DOMContentLoaded', options._onDocumentLoaded);

chrome.storage.onChanged.addListener(options._updatesDomainLists);